JP2004336988A - Motor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve precision in position calculation by allowing a spring constant k of a spring member used for position calculation for calculating the position of a moving member driven as an accurate value corresponding to an individual linear vibration motor, related to a device 101a for driving the linear vibration motor 100 that comprises the spring member for supporting the moving member so that a spring vibration system including the moving member is formed. <P>SOLUTION: The motor driver comprises a moving member forced vibration part 3a for the free vibration of a moving member of the linear vibration motor 100, a relative position detection part 4a for detecting timing at which the moving member of free vibration passes a certain fixed point (relative position), and a specific vibration frequency detector 5a for detecting a specific vibration frequency f of the moving member based on an output information Dpr of the detecting part 4a. The spring constant k of the spring member is determined from the specific vibration frequency f which is detected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor drive device, and more particularly to a motor drive device that drives a linear vibration motor having a mover and a spring member that supports the mover.

  Conventionally, devices using a linear vibration motor include a vibration generator that transmits an incoming call by mechanical vibration, such as a mobile phone, a compressor that compresses and circulates gas or liquid, or a reciprocating electric shaver. The razor uses the linear vibration motor as a driving source.

  A typical linear vibration motor has a single-phase synchronous motor structure, i.e., a movable element composed of a permanent magnet and a stator formed by winding a coil around an iron core, and is movable by applying an AC voltage to the coil. The child reciprocates.

  When vibration is generated by the reciprocating motion of the mover in this way, a strong electromagnetic force is required. In a linear vibration motor, the mover is supported by a spring member to form a spring vibration system including the mover. Accordingly, the energy required for the driving can be reduced. That is, in the linear vibration motor in which the mover is supported by the spring member, the linear vibration motor can be driven with small energy by vibrating the spring vibration system including the mover at its natural frequency (resonance frequency).

  However, in the case of the linear vibration motor, if the stroke length of the mover exceeds a certain allowable value, problems such as collision between the mover and the motor housing and breakage of the support spring occur. Need to control.

  Japanese Patent Application Laid-Open No. H11-324911 discloses a drive device for driving a linear vibration motor, which includes a detection unit such as a position sensor for detecting the position of the mover of the linear vibration motor. When the stroke length exceeds a certain allowable value, the output of the linear vibration motor is suppressed, that is, the amplitude value of the voltage or current applied to the linear vibration motor is reduced. There is disclosed one that prevents the linear vibration motor from being broken due to a collision or the support spring extending beyond a limit value.

  As the position detection unit as described above, a sensor capable of detecting the degree of displacement of the mover (movement amount of the mover) with respect to the mover reference position such as the mover neutral position without contacting the mover in the linear vibration motor, For example, a displacement meter using an eddy current method, a displacement meter using a differential transformer, and the like are used.

  However, the use of such a sensor not only increases the manufacturing cost of the linear vibration motor, but also requires a space for mounting the sensor and increases the size of the housing of the linear vibration motor. Also, when considering a compressor as an application of a linear vibration motor, such a sensor may be used in a state where it is exposed to high-temperature and high-pressure gas, so that the reliability problem of the sensor itself, in other words, In addition, there is a problem that such a sensor is required to be used reliably under an atmosphere of high temperature and high pressure.

  Therefore, as a method of detecting the position of the mover, the position of the mover is not detected by a position sensor disposed inside the linear vibration motor, but the drive current and drive voltage supplied to the linear vibration motor are directly detected. There has been proposed a method of measuring the position of the mover based on the measured value (for example, see Patent Document 2).

  Hereinafter, a method of detecting the position of the mover of the linear vibration motor described in this publication will be described. In this publication, since the linear vibration motor is applied to the linear compressor, the movable member reciprocates to compress gas in the cylinder constituting the linear compressor, thereby preventing collision. Description will be made using a cylinder head as an object.

FIG. 11 is a diagram illustrating an equivalent circuit of a linear vibration motor that drives a mover.
In the figure, L is the equivalent inductance [H] of the winding constituting the linear vibration motor, and R is the equivalent resistance [Ω] of the winding. V is an instantaneous voltage [V] applied to the linear vibration motor, and I is a current [A] supplied to the linear vibration motor. α × v is an induced electromotive voltage [V] generated by driving the linear vibration motor, α is a thrust constant [N / A] of the linear vibration motor, and v is an instantaneous speed [m / s] of the linear vibration motor.

  Here, the thrust constant α of the linear vibration motor indicates a force [N] generated when a unit current [A] is applied to the linear vibration motor. The unit of the thrust constant α is represented by [N / A], but this unit is equivalent to [Wb / m] and [V · s / m].

  The equivalent circuit shown in FIG. 11 is derived from Kirchhoff's law, from which the instantaneous speed v [m / s] of the linear vibration motor is obtained.

That is, when the drive voltage is applied to the linear vibration motor, the applied voltage (V) to the linear vibration motor is reduced by the voltage drop (I × R) [V] due to the equivalent resistance of the winding of the linear vibration motor, and The sum of the voltage drop (L · dI / dt) [V] due to the equivalent inductance of the line and the induced electromotive voltage (α × v) [V] generated by driving the linear vibration motor will be balanced by the following (1). The equation holds.

  The coefficients α [N / A], R [Ω], and L [H] used in the above equation (1) are constants specific to the motor and are known values. Therefore, the instantaneous speed v [m / s] is obtained from these constants and the measured applied voltage V [V] and applied current I [A] based on the equation (1).

Further, the displacement of the mover (the distance from the indeterminate reference position to the mover) x [m] is obtained by time integration of the instantaneous speed v [m / s] as shown in the following equation (2). Note that the constant Const. Is the displacement of the mover at the start of the integration.

  As described above, in the mover position detection method described in the above publication, the arithmetic processing including the differential processing based on the above equation (1) is performed on the measured value V of the applied voltage and the measured value I of the supplied current to the linear vibration motor. In this way, the instantaneous speed v of the mover is obtained, and the instantaneous speed v is subjected to arithmetic processing including integration processing based on the above equation (2) to calculate the mover displacement x. .

  However, the mover displacement x obtained by the calculation based on the above equations (1) and (2) is a displacement based on a certain position on the mover axis, and is directly calculated from the displacement x. However, the distance from the cylinder head where the mover may collide to the top dead center position of the mover cannot be determined.

  In other words, when a load is applied to the compressor to which the linear vibration motor is applied, the center position of the mover (the center position of the mover amplitude) in the reciprocating motion of the mover is adjusted to the neutral position of the mover by the pressure of the refrigerant gas. (That is, the mover amplitude center position when the pressure in the compression chamber is equal to the back pressure), and the mover reciprocates around the offset mover amplitude center position. In other words, the displacement x of the mover obtained from the equation (2) includes an average component.

  However, all of the actual analog or digital integrators do not perform an ideal integration process of outputting a complete response signal to a constant or DC input, but limit the response to the DC input. Therefore, an actual integrator cannot perform integration calculation processing that reflects the average component of the mover displacement amount x. The reason why the actual integrator is limited in DC response in this way is to prevent the output from being saturated by an unavoidable DC component in the input signal.

  As a result, the displacement amount x [m] of the mover obtained by the integration process based on the expression (2) by the actual integrator is obtained by directly calculating the actual distance between the mover and the housing from the displacement amount. It simply indicates the position of the mover with respect to a certain point on the axis of the mover.

  Therefore, the mover displacement amount x [m] obtained from the equation (2) is converted into a mover displacement amount x 'indicating the mover position with respect to the mover amplitude center position, and the converted mover displacement amount x' is further obtained. Using x ′, an arithmetic process is performed to determine the mover displacement xav ″ that indicates the mover amplitude center position and is based on the cylinder head.

Hereinafter, these calculation processes will be described in detail.
FIG. 12 is a view schematically showing the position of a mover in a housing (here, a cylinder) of the linear vibration motor.
In the drawings, Me indicates the mover, and Mc indicates the inner wall surface (cylinder inner surface) of the linear vibration motor housing that accommodates the mover.

First, the three coordinate systems shown in FIG. 12, that is, the first coordinate system X, the second coordinate system X ', and the third coordinate system X "will be briefly described.
The first coordinate system X is a coordinate system representing the displacement amount x of the mover, and has a certain point Paru on the axis of the mover as the origin (x = 0). Therefore, the absolute value of the displacement x indicates the distance from the point Paru to the mover tip position P.

  The second coordinate system X 'is a coordinate system representing the mover displacement amount x', and the mover amplitude center position Pav is set as the origin (x '= 0). Therefore, the absolute value of the displacement amount x 'represents the distance from the amplitude center position Pav to the mover tip position P.

  The third coordinate system X "is a coordinate system representing the above-mentioned mover displacement x", and the position Psh of the cylinder head on the mover axis is set as the origin (x "= 0). Therefore, the displacement x" Represents the distance from the cylinder head position Psh to the mover tip position P.

Next, calculation for obtaining the mover displacement amount x ″ will be described.
The position of the mover when the mover is closest to the cylinder head (top dead center position of the mover) Ptd is indicated by the displacement xtd on the first coordinate system X, and the mover is farthest from the cylinder head. The position of the mover (the bottom dead center position of the mover) Pbd at that time is indicated by the displacement xbd on the first coordinate system X. Then, a displacement amount xtd corresponding to the mover top dead center position Ptd on the first coordinate system X and a displacement amount corresponding to the mover bottom dead center position Pbd on the first coordinate system X The mover stroke Lps [m] is obtained from the difference from the quantity xbd.

  The mover amplitude center position Pav in the state where the mover is reciprocating is obtained from the displacement xtd of the mover position (movement element top dead center position) Ptd when the mover is closest to the cylinder head. This is a position away from the cylinder head by half the length (Lps / 2) of the mover stroke Lps [m]. Therefore, the mover amplitude center position Pav is represented by the displacement xav (= (xbd-xtd) / 2) on the first coordinate system X.

  Further, the constant Const. Is set to 0, the mover tip position P is indicated by the mover displacement amount x '[m] on the mover amplitude center position Pav as a reference (origin), in other words, on the second coordinate system X'. A new function is derived.

Next, a description will be given of a method of obtaining the mover displacement xav "indicating the distance from the cylinder head Psh to the mover amplitude center position Pav in the third coordinate system X" having the origin at the cylinder head position Psh.
When the linear compressor is sucking refrigerant gas (suction state), that is, when the suction valve is open, both the pressure inside the compression chamber and the pressure on the back of the mover become the suction pressure of the refrigerant. Become equal. This is because the linear compressor has a structure in which the differential pressure is 0 when the suction valve is open. In this state, the force of the refrigerant gas acting on the mover can be ignored. In other words, in this state, the only forces acting on the mover are the repulsive force of the spring generated by the bending of the support spring and the electromagnetic force generated by applying a current to the linear vibration motor. According to Newton's law of dynamics, the sum of these forces equals the product of the total mass of the moving member in motion and its acceleration.

（３）式において、ｍは往復運動を行っている可動部材の全質量［ｋｇ］、ａは上記可動部材の瞬時加速度［ｍ／ｓ／ｓ］、ｋはリニア振動モータを構成する支持バネのバネ定数［Ｎ／ｍ］である。また、ｘav”は、上述した、可動子振幅中心位置を示す第３の座標系Ｘ”での変位量であり、この変位量ｘav”は、その絶対値が、シリンダヘッド位置Ｐshから可動子振幅中心位置Ｐavまでの距離を表すものである。さらに、ｘini”は、可動子中立位置Ｐiniを示す第３の座標系Ｘ”での変位量であり、この変位量ｘini”は、その絶対値が、上記可動子中立位置（上記支持バネが変形していない状態での可動子の位置）Ｐiniとシリンダヘッド位置Ｐshとの間の距離［ｍ］を表すものである。 Therefore, in this state, the following equation (3) is established as a motion equation relating to the movable member.

In the equation (3), m is the total mass [kg] of the movable member performing the reciprocating motion, a is the instantaneous acceleration [m / s / s] of the movable member, and k is the value of the support spring constituting the linear vibration motor. It is a spring constant [N / m]. Further, xav "is the displacement amount in the third coordinate system X" indicating the center position of the armature amplitude described above, and the absolute value of the displacement amount xav "is calculated from the cylinder head position Psh by the armature amplitude. Further, xini "is a displacement amount in the third coordinate system X" indicating the mover neutral position Pini, and the absolute value of the displacement amount xini "is represented by xini". , The distance [m] between the mover neutral position (the position of the mover when the support spring is not deformed) Pini and the cylinder head position Psh.

Here, the instantaneous acceleration a [m / s / s] can be obtained as shown in the following equation (4) by differentiating the instantaneous velocity v [m / s] expressed by the equation (1). it can.

  The displacement x '[m] of the second coordinate system X', which indicates the distance from the mover amplitude center position Pav to the mover tip position P, is represented by the constant Const. Is set to 0.

  Furthermore, the displacement amount of the third coordinate system X ″, which represents the total mass m [kg] of the movable member, the spring constant k [N / m] of the support spring, and the distance from the cylinder head position Psh to the mover neutral position Pini. xini "[m] is a known value, and a measured value can be used as the drive current I.

  Therefore, the displacement amount xav ″ of the third coordinate system X ″, which indicates the distance from the cylinder head position Psh to the mover amplitude center position Pav, can be calculated using the equation (3).

  The displacement xtd "[m] of the third coordinate system X", which indicates the top dead center position of the mover (the position at which the mover comes closest to the cylinder head) Ptd, is determined by the third formula obtained by the above equation (3). From the displacement amount xav "(distance from the cylinder head position Psh to the armature amplitude center position Pav) of the coordinate system X" of No. 3 by a distance (Lps / 2) that is a half (Lps / 2) of the armature stroke length Lps [m] already obtained. It is obtained as the amount of displacement at a position away from the cylinder head.

  In this manner, the third coordinate indicating the stroke length Lps [m] of the mover and the top dead center position Ptd of the mover as a distance from the cylinder head position Psh from the current I and the voltage V applied to the linear vibration motor. The displacement xtd "[m] of the system X" is calculated.

In addition, the present inventor has proposed a method of using the mass spring ratio m / k as a method of detecting the position of the mover without a position sensor, unlike the method of using the spring constant k as described above ( For example, see Patent Document 3).
JP-A-11-324911 Japanese Patent Publication No. Hei 8-508558 JP 2002-354864 A

  However, as described above, in the method of deriving the position of the mover by the position calculation based on the measured values of the drive current and the drive voltage of the linear vibration motor, the spring constant k and the mass spring ratio m used for the position calculation are calculated. There is a problem in that an error occurs in the calculation result due to the variation of / k between individuals, a change over time, a change due to heat, and the like.

  Specifically, when the values of the spring constant k and the mass spring ratio m / k vary by 10%, the calculated absolute position of the mover varies by 10% or more. In this case, in order to avoid collision between the mover and the cylinder head based on the position of the mover obtained by the above calculation, the clearance between the mover and the cylinder head must have a margin of 10% or more. In addition, the stroke of the mover cannot be increased until the mover comes close to the collision limit position of the mover obtained by calculation (that is, the position where the mover contacts the cylinder head).

  Further, the reciprocating motion of the mover such that the size of the expansion and contraction of the support spring does not exceed the expansion and contraction range assumed for the support spring (the assumed expansion and contraction range) does not cause a large temporal change. The spring constant k and the mass spring ratio m / k greatly change when the movement of the mover becomes larger than the expected expansion / contraction range, such as when the operation of the linear vibration motor fails. It is thought that there is also a case.

  In such a case, it is necessary to replace the linear vibration motor with its motor driving device. Then, there is a problem that the reliability as a driving device of the linear vibration motor is reduced.

  In addition, it is conceivable to increase the size of the support spring so that the magnitude of expansion and contraction of the support spring does not exceed the expected range even when the operation of the linear vibration motor is interrupted. There is a problem that it not only increases the size but also increases the cost.

  The present invention has been made in order to solve the conventional problems as described above, and based on a spring constant or a mass spring ratio obtained from a natural vibration frequency of a mover of a linear vibration motor, a mover with a high accuracy. It is an object of the present invention to provide a motor drive device capable of performing a position calculation for calculating a position.

  The invention according to claim 1 of the present application is a motor drive device for driving a linear vibration motor having a movable member provided so as to be able to reciprocate and a spring member supporting the movable member, wherein the movable member has a free vibration. A movable parameter forced vibration unit, a vibration parameter obtaining unit that obtains a natural vibration parameter indicating a natural vibration of the movable element based on a free vibration state of the mover, and using the obtained natural vibration parameter, A spring constant determining unit that calculates a spring constant of a spring member; and a mover position calculating unit that calculates a position of the mover using the spring constant calculated by the spring constant determining unit. It is assumed that.

  According to a second aspect of the present invention, in the motor driving device according to the first aspect, the vibration parameter acquiring unit detects a timing at which the movable element that freely vibrates passes a fixed relative position with respect to a reference position of the vibration. And a natural frequency detecting unit that detects a natural vibration frequency that is a natural vibration parameter of the movable element based on an output of the timing detecting unit. Multiplying the natural vibration frequency by two times the pi, squaring the multiplication result, and multiplying the square of the multiplication result by the mass of the mover to calculate the spring constant. Things.

  According to a third aspect of the present invention, in the motor driving device according to the first aspect, the vibration parameter acquiring unit detects a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. A timing detection unit, based on an output of the timing detection unit, a natural angular frequency detection unit that detects a natural angular frequency that is a natural vibration parameter of the mover; The detected natural angular frequency is squared, and the square of the natural angular frequency is multiplied by the mass of the mover to calculate the spring constant.

  According to a fourth aspect of the present invention, in the motor driving device according to the first aspect, the vibration parameter acquiring section detects a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. A timing detecting unit, based on an output of the timing detecting unit, a natural vibration period detecting unit that detects a natural vibration period that is a natural vibration parameter of the movable element; The natural vibration period is divided by twice the pi, the division result is squared, the square of the division result is multiplied by the reciprocal of the mass of the mover, and the reciprocal of the multiplication result is obtained. Calculating a constant.

  The invention according to claim 5 of the present application is a motor drive device for driving a linear vibration motor having a movable element provided so as to be capable of reciprocating motion and a spring member supporting the movable element, wherein the linear vibration motor is driven by the linear vibration motor. A motor driver that applies a voltage, a current detection unit that detects a current supplied from the motor driver to the linear vibration motor, a voltage detection unit that detects a voltage supplied from the motor driver to the linear vibration motor, A resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor from the detected current and the detected voltage; a resonance drive frequency detected by the resonance frequency detection unit that is twice the pi; And a square of the multiplication result, multiplying the square of the multiplication result by the mass of the mover to calculate the spring constant. And a mover position calculation unit for calculating the position of the mover using the spring constant that has been calculated by the constant determination unit, it is characterized in.

  According to a sixth aspect of the present invention, in the motor driving device according to any one of the first to fourth aspects, the timing detecting section includes an induced voltage generated in a winding of the linear vibration motor due to free vibration of the mover. Is used to detect the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration.

  The invention according to claim 7 of the present application is the motor driving device according to any one of claims 1 to 4, wherein the mover forcibly vibrating section mechanically applies a force to the mover such that the mover freely vibrates. And applying it.

  The invention according to claim 8 of the present application is the motor driving device according to any one of claims 1 to 4, wherein the mover forced vibration unit is supplied to the linear vibration motor such that the mover freely vibrates. The present invention is characterized by temporarily interrupting the current flowing therethrough.

  According to a ninth aspect of the present invention, in the motor drive device according to any one of the first to fourth aspects, the movable element forced vibration section allows the movable element to freely move a load connected to the linear vibration motor. It is separated from the linear vibration motor so as to vibrate.

  According to a tenth aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. And a control unit for setting the operation mode to one of a calculation mode for calculating a spring constant of the spring member. The control unit temporarily sets the operation mode to a calculation mode before starting the operation of the load. The spring constant calculation unit calculates the spring constant in a calculation mode before the operation of the load starts, and the mover position calculation unit calculates the load of the load in the operation mode. The position of the mover is calculated using a spring constant calculated before the start of operation.

  According to an eleventh aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Mode, and a control unit for setting the operation mode to one of the operation modes for calculating the spring constant of the spring member, wherein the control unit temporarily sets the operation mode to the operation mode after the end of the operation of the load. The spring constant calculation unit calculates the spring constant in an operation mode after the end of the operation of the load, and the mover position operation unit calculates the most recently set operation in the operation mode. The position of the mover is calculated using the spring constant calculated in the mode.

  According to a twelfth aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Mode, a control unit that sets the mode to one of the operation modes for calculating the spring constant of the spring member, a temperature detection unit that detects the temperature of the linear vibration motor, and a spring constant in the operating state of the load. A spring constant estimating unit for estimating, wherein the control unit temporarily sets the operation mode to the operation mode at least one of before and after the start of the operation of the load, and The constant estimating unit is configured to calculate the linear vibration based on the calculated spring constant and the temperature detected by the temperature detecting unit when the spring constant is calculated in the calculation mode. Deriving the relationship between the motor temperature and its spring constant, and in the operation mode, based on the temperature detected by the temperature detection unit, from the relationship between the temperature and the spring constant, the spring constant in the operation state of the load. And the mover position calculation unit calculates the position of the mover using the estimated spring constant in the operation mode.

  An invention according to claim 13 of the present application is a motor drive device for driving a linear vibration motor having a movable element provided so as to be capable of reciprocating motion and a spring member supporting the movable element, wherein the movable element has a free vibration. A movable parameter forced vibration unit, a vibration parameter obtaining unit that obtains a natural vibration parameter indicating a natural vibration of the movable element based on a free vibration state of the mover, and using the obtained natural vibration parameter, A mass spring ratio determining unit that calculates a mass spring ratio which is a value of a ratio between a mass of the mover and a spring constant of the spring member; and the movable unit using the mass spring ratio calculated by the mass spring ratio determining unit. And a mover position calculating unit for calculating the position of the child.

  According to a fourteenth aspect of the present invention, in the motor driving device according to the thirteenth aspect, the vibration parameter acquiring unit detects a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. And a natural frequency detecting unit that detects a natural vibration frequency that is a natural vibration parameter of the movable element based on an output of the timing detecting unit. Multiplying the obtained natural vibration frequency by twice the pi, squaring the multiplication result, finding the reciprocal of a value obtained by squaring the multiplication result, and calculating the mass spring ratio. To do.

  According to a fifteenth aspect of the present invention, in the motor driving device according to the thirteenth aspect, the vibration parameter acquiring section detects a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. A timing detecting unit, based on an output of the timing detector, having a natural angular frequency detecting unit that detects a natural angular frequency that is a natural vibration parameter of the movable element, the mass spring ratio determining unit includes: The detected natural angular frequency is squared, and the reciprocal of a value obtained by squaring the natural angular frequency is calculated to calculate the mass spring ratio.

  According to a sixteenth aspect of the present invention, in the motor driving device according to the thirteenth aspect, the vibration parameter acquiring unit detects a timing at which the movable element that freely vibrates passes through a certain relative position with respect to a reference position of the vibration. A timing detecting unit; and a natural vibration period detecting unit that detects a natural vibration period, which is a natural vibration parameter of the movable element, based on an output of the timing detector. The obtained natural vibration period is divided by twice the pi, and the result of the division is squared to calculate the mass spring ratio.

  An invention according to claim 17 of the present application is a motor drive device for driving a linear vibration motor having a mover provided so as to be able to reciprocate and a spring member supporting the mover. A motor driver that applies a voltage, a current detection unit that detects a current supplied from the motor driver to the linear vibration motor, a voltage detection unit that detects a voltage supplied from the motor driver to the linear vibration motor, A resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor from the detected current and the detected voltage; a resonance drive frequency detected by the resonance frequency detection unit that is twice the pi; And the square of the multiplication result, find the reciprocal of the value obtained by the square of the multiplication result, and determine the mass spring ratio by a mass spring ratio determination unit. And a mover position calculation unit for calculating the position of the mover using the mass-spring ratio calculated by the mass-spring ratio decision unit, it is characterized in.

  According to an eighteenth aspect of the present invention, in the motor driving device according to any one of the thirteenth to sixteenth aspects, the timing detection unit includes an induced voltage generated in a winding of the linear vibration motor due to free vibration of the mover. Is used to detect the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration.

  The invention according to claim 19 of the present application is the motor driving device according to any one of claims 13 to 16, wherein the mover forcibly vibrating section mechanically applies a force to the mover such that the mover freely vibrates. And applying it.

  According to a twentieth aspect of the present invention, in the motor driving device according to any one of the thirteenth to sixteenth aspects, the mover forced vibration part is supplied to the linear vibration motor so that the mover freely vibrates. The present invention is characterized by temporarily interrupting the current flowing therethrough.

  According to a twenty-first aspect of the present invention, in the motor drive device according to any one of the thirteenth to sixteenth aspects, the forcible vibrator of the mover allows a load connected to the linear vibration motor to move freely. It is separated from the linear vibration motor so as to vibrate.

  According to a twenty-second aspect of the present invention, in the motor drive device according to any one of the thirteenth to seventeenth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Mode, and a control unit that sets the operation mode to any one of a calculation mode for calculating the mass spring ratio.The control unit temporarily sets the operation mode to a calculation mode before starting the operation of the load. The mass spring ratio calculation unit calculates the mass spring ratio in a calculation mode before the operation of the load starts, and the mover position calculation unit calculates the load in the operation mode. The position of the mover is calculated using the mass spring ratio calculated before the start of the operation.

  According to a twenty-third aspect of the present invention, in the motor drive device according to any one of the thirteenth to seventeenth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. And a control unit that sets the operation mode to one of a calculation mode for calculating the mass spring ratio. The control unit temporarily sets the operation mode to the calculation mode after the operation of the load ends. Wherein the mass spring ratio calculation unit calculates the mass spring ratio in a calculation mode after the end of the operation of the load, and the mover position calculation unit calculates a mass spring ratio that has recently been set in the operation mode. The position of the mover is calculated using the mass spring ratio calculated in the calculation mode.

  According to a twenty-fourth aspect of the present invention, in the motor driving device according to any one of the thirteenth to seventeenth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Mode, a control unit for setting the operation mode to one of the operation modes for calculating the mass spring ratio, a temperature detection unit for detecting the temperature of the linear vibration motor, and estimating the mass spring ratio in the operating state of the load. A mass spring ratio estimating unit that performs the operation mode temporarily at least one of before and after the start of the operation of the load. The spring ratio number estimating unit, in the calculation mode, based on the calculated mass spring ratio and the temperature detected by the temperature detection unit when the mass spring ratio is calculated, The relationship between the temperature of the near vibration motor and its mass spring ratio is derived, and in the above operation mode, based on the temperature detected by the temperature detection unit, the operation state of the load is obtained from the relationship between the temperature and the mass spring ratio. , And the mover position calculating section calculates the position of the mover using the estimated mass spring ratio in the operation mode. .

  The invention according to claim 25 of the present application relates to an air conditioner having a cylinder and a piston, and a compressor for compressing a fluid in the cylinder by reciprocating motion of the piston, wherein the mover provided to be reciprocally movable. And a spring member that supports the mover, a linear vibration motor that reciprocates the piston, and a motor drive device that drives the linear vibration motor. A motor drive device according to any one of 5, 13, and 17, wherein

  The invention according to claim 26 of the present application is a refrigerator having a compressor that has a cylinder and a piston and compresses a fluid in the cylinder by reciprocating motion of the piston, and a mover provided to be reciprocally movable; A linear vibration motor having a spring member for supporting the mover and reciprocating the piston, and a motor driving device for driving the linear vibration motor, wherein the motor driving device is 13. A motor drive device according to any one of items 13 and 17.

  An invention according to claim 27 of the present application is a cryogenic refrigerator having a cylinder and a piston, and a compressor for compressing a fluid in the cylinder by reciprocating motion of the piston, wherein the movable unit is provided so as to be capable of reciprocating motion. A linear vibration motor for reciprocating the piston; and a motor driving device for driving the linear vibration motor, the motor driving device comprising: , 5, 13, and 17.

  An invention according to claim 28 of the present application is a water heater having a cylinder and a piston, and a compressor that compresses a fluid in the cylinder by reciprocating motion of the piston, wherein a mover provided so as to be reciprocable. A linear vibration motor for reciprocating the piston, and a motor driving device for driving the linear vibration motor, the motor driving device comprising: , 13, and 17.

  An invention according to claim 29 of the present application is a mobile phone including a linear vibration motor that generates vibration, and a motor drive device that drives the linear vibration motor, wherein the linear vibration motor is provided so as to be capable of reciprocating motion. And a spring member that supports the mover, wherein the motor drive device is the motor drive device according to any one of claims 1, 5, 13, and 17. It is assumed that.

  According to the invention according to claim 1 of the present application, there is provided a motor drive device for driving a linear vibration motor having a movable element provided to be able to reciprocate and a spring member supporting the movable element, wherein the movable element is A movable element forcibly vibrating section for performing free vibration, a vibration parameter obtaining section for obtaining a natural vibration parameter indicating a natural vibration of the movable element based on the free vibration state of the mover, and using the obtained natural vibration parameter. A spring constant determining unit that calculates a spring constant of the spring member, and a mover position calculating unit that calculates the position of the mover using the spring constant calculated by the spring constant determining unit. Therefore, there is an effect that the position calculation for calculating the position of the mover can be accurately performed by using an accurate spring constant.

  In other words, in the conventional method in which the spring constant used for the position calculation for calculating the position of the mover while the linear vibration motor is being driven is a fixed value, the influence of the variation of the spring constant among the individual linear vibration motors is not sufficient. Although the accuracy of the position of the mover calculated by the position calculation is low due to the above, in the present invention, the spring constant is calculated for each linear vibration motor. The operation is performed without being affected by the variation of the spring constant between the motors. That is, the spring constant used for the position calculation can be set to an accurate value corresponding to each linear vibration motor, and the accuracy of the position calculation can be improved.

  Further, in the present invention, since the process of calculating the spring constant is performed after assembling the linear vibration motor, the calculation of the spring constant is compared with the case where the calculation is performed at the time of assembling the linear vibration motor, as follows. There is also an effect.

  In other words, in the method of determining the spring constant used for the position calculation of the mover at the time of assembling the linear vibration motor, not only the number of complicated steps for correcting the spring constant at the time of assembly increases, but also the linear vibration at which the spring constant is determined. The motor will be combined with the motor drive device adjusted to correspond to the determined spring constant. As a result, if either the linear vibration motor or the motor drive device fails, both need to be replaced. Become.

  On the other hand, in the present invention, the process of calculating the spring constant is performed after assembling the linear vibration motor, so that there is no need for a step of correcting the spring constant at the time of assembly, and furthermore, the motor driving device is added to the linear vibration motor. The spring constant is determined in the combined state, so even if one of the linear vibration motor and the driving device fails, the spring constant can be determined after replacing the failed one, and the failed part can be replaced. There is also the effect that it is enough.

  According to the second aspect of the present invention, in the motor driving device according to the first aspect, the vibration parameter acquisition unit is configured to determine a timing at which the movable element that vibrates freely passes a certain relative position with respect to a reference position of the vibration. And a natural frequency detecting unit that detects a natural vibration frequency that is a natural vibration parameter of the mover based on an output of the timing detecting unit. Multiplying the detected natural vibration frequency by twice the pi, squaring the multiplication result, and multiplying the square of the multiplication result by the mass of the mover to calculate the spring constant. Therefore, an accurate spring constant corresponding to each linear vibration motor can be obtained based on the natural vibration frequency of the mover of each linear vibration motor.

  According to the third aspect of the present invention, in the motor driving device according to the first aspect, the vibration parameter acquisition unit determines a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. A timing detecting section for detecting, and a natural angular frequency detecting section for detecting a natural angular frequency, which is a natural vibration parameter of the movable element, based on an output of the timing detecting section. Squaring the detected natural angular frequency, multiplying the square of the natural angular frequency by the mass of the mover, and calculating the spring constant. An accurate spring constant corresponding to the linear vibration motor can be obtained based on the natural angular frequency of the mover.

  According to the invention according to claim 4 of the present application, in the motor drive device according to claim 1, the vibration parameter acquiring unit determines a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. A timing detecting unit for detecting, based on an output of the timing detecting unit, a natural vibration period detecting unit for detecting a natural vibration period that is a natural vibration parameter of the movable element; the spring constant determining unit includes: Divide the detected natural vibration period by twice the pi, square the division result, multiply the square of the division result by the reciprocal of the mass of the mover, and obtain the reciprocal of the multiplication result, Since the above-mentioned spring constant is calculated, an accurate spring constant corresponding to the linear vibration motor can be obtained based on the natural vibration period of the mover of each linear vibration motor.

  According to the invention of claim 5 of the present application, there is provided a motor drive device for driving a linear vibration motor having a movable member provided to be able to reciprocate and a spring member supporting the movable member, wherein the linear vibration motor A motor driver that applies a drive voltage to the motor, a current detector that detects a current supplied from the motor driver to the linear vibration motor, and a voltage detector that detects a voltage supplied to the linear vibration motor from the motor driver A resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor from the detected current and the detected voltage, and a resonance drive frequency that is detected by the resonance frequency detection unit. A spring constant determining unit for multiplying by two, squaring the multiplication result, multiplying the square of the multiplication result by the mass of the mover, and calculating the spring constant; And a mover position calculation unit that calculates the position of the mover using the spring constant calculated by the spring constant determination unit. There is an effect that the position calculation for calculating the position can be performed with high accuracy.

  Further, according to the present invention, the process of calculating the spring constant can be performed after assembling the linear vibration motor. However, since the spring constant is determined in a state in which the step of correcting the spring constant is not required and the linear vibration motor is combined with the motor driving device, even if one of the linear vibration motor and the driving device breaks down, Further, the spring constant can be determined after replacing the failed one, and there is an effect that only the replacement of the failed part is sufficient.

  According to the invention according to claim 6 of the present application, in the motor drive device according to any one of claims 1 to 4, the timing detection section is generated in a winding of the linear vibration motor by free vibration of the mover. Using the induced voltage, the timing at which the movable element that vibrates freely passes through a certain relative position with respect to the reference position of the vibration is detected. Instead of using a dedicated position sensor, calculation can be performed using components such as an existing voltage detector. As a result, the number of components can be reduced, and the size and cost can be reduced.

  According to the invention according to claim 7 of the present application, in the motor drive device according to any one of claims 1 to 4, the forcible vibrator of the mover mechanically moves the mover so that the mover freely vibrates. Since a force is applied, the mover forced vibration section can be realized by a simple mechanism.

  According to the invention of claim 8 of the present application, in the motor driving device according to any one of claims 1 to 4, the movable element forced vibration unit supplies the linear vibration motor to the movable element so that the movable element freely vibrates. Since the current is temporarily interrupted, it is possible to realize using existing parts, for example, a motor driver, without using a dedicated part as the mover forced vibration part, As a result, the number of parts is reduced, and the size and cost can be reduced. In addition, when the linear vibration motor is hermetically sealed and, for example, a mechanical force cannot be applied to the internal mover, it is needless to say that the method of freely vibrating the mover of the present invention is effective.

  According to the ninth aspect of the present invention, in the motor driving device according to any one of the first to fourth aspects, the movable-element forced vibration unit causes the load connected to the linear vibration motor to change the load of the movable element. Is separated from the linear vibration motor so that it freely vibrates, so that it can be realized using existing parts, for example, a motor driver or the like, without using a dedicated part as the mover forced vibration part. As a result, the number of components is reduced, and the size and cost can be reduced. In addition, when the linear vibration motor is hermetically sealed and, for example, a mechanical force cannot be applied to the internal mover, it is needless to say that the method of freely vibrating the mover of the present invention is effective.

  According to the tenth aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is set such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Operating mode, and a control unit for setting the operation mode to one of the calculation modes for calculating the spring constant of the spring member, the control unit temporarily changes the operation mode before starting the operation of the load. The spring constant calculation unit calculates the spring constant in a calculation mode before the start of the operation of the load, and the mover position calculation unit calculates the spring constant in the operation mode. The position of the mover is calculated using the spring constant calculated before the start of the operation of the load, so that always using the spring constant in the latest state of the linear vibration motor, Calculate location Operation is that the result of performed, Therefore, even if changes in the spring constant with time, there is an effect that it is possible to perform high position calculation accuracy

  According to the eleventh aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Operating mode, and a control unit for setting the operation mode to one of an operation mode for calculating the spring constant of the spring member. The control unit temporarily calculates the operation mode after the operation of the load is completed. The spring constant calculation unit calculates the spring constant in a calculation mode after the end of the operation of the load, and the mover position calculation unit sets the most recently set in the operation mode. The position of the mover is calculated by using the spring constant calculated in the calculation mode, and the position of the mover is always calculated using the spring constant of the linear vibration motor in the latest state. Calculate That operation is possible with the result that performed, Therefore, even if the change in spring constant with time, there is an effect that it is possible to perform high position calculation accuracy.

  According to the present invention, the spring constant is calculated immediately after the operation of the linear vibration motor, so that the spring constant is calculated in a state where the motor temperature is substantially equal to that when the motor is actually operating. In other words, the spring constant changes depending on the temperature. By calculating the spring constant based on the temperature at which the motor actually operates, it is possible to obtain an accurate spring constant during operation of the linear vibration motor. There is an effect that the position calculation for calculating the position can be performed with higher accuracy.

  Furthermore, in the present invention, since the calculation of the spring constant is performed after the operation is completed, there is an effect that the operation of calculating the spring constant does not hinder the driving of the linear vibration motor.

  According to the twelfth aspect of the present invention, in the motor driving device according to any one of the first to fifth aspects, the operation mode is set such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Operating mode, a control unit for setting one of the operation modes for calculating the spring constant of the spring member, a temperature detecting unit for detecting the temperature of the linear vibration motor, and a spring in the operating state of the load. A spring constant estimating unit for estimating a constant, wherein the control unit temporarily sets the operation mode to the operation mode at least one of before and after the start of the operation of the load, The spring constant estimating unit is configured to calculate the spring constant based on the calculated spring constant and the temperature detected by the temperature detecting unit when the spring constant is calculated in the calculation mode. A) Deriving the relationship between the temperature of the vibration motor and its spring constant, and in the above-mentioned operation mode, based on the temperature detected by the temperature detection unit, from the relationship between the temperature and the spring constant, A spring constant is estimated, and the mover position calculation unit calculates the position of the mover using the estimated spring constant in the operation mode. An accurate spring constant is always used for the position calculation of the mover performed in the state, and the accuracy of the position calculation of the mover can be improved.

  Further, in the present invention, since the spring constant of the linear vibration motor in the operating state is estimated from the temperature when the operation of the linear vibration motor is actually performed, even in a state where the temperature change of the linear vibration motor is large. There is an effect that the position calculation of the mover can be performed with high accuracy by using an accurate spring constant.

  According to the invention according to claim 13 of the present application, there is provided a motor drive device for driving a linear vibration motor having a movable member provided so as to be capable of reciprocating movement and a spring member supporting the movable member, A movable element forcibly vibrating section for performing free vibration, a vibration parameter obtaining section for obtaining a natural vibration parameter indicating a natural vibration of the movable element based on the free vibration state of the mover, and using the obtained natural vibration parameter. Using a mass spring ratio determining unit that calculates a mass spring ratio that is a value of a ratio between the mass of the mover and the spring constant of the spring member, using the mass spring ratio calculated by the mass spring ratio determining unit, And a mover position calculating section for calculating the position of the mover, so that the position calculation for calculating the position of the mover can be accurately performed using an accurate mass spring ratio. Effect There is.

  In other words, in the conventional method in which the mass spring ratio used for the position calculation for calculating the position of the mover while the linear vibration motor is being driven is a fixed value, the variation in the mass spring ratio among the individual linear vibration motors. The accuracy of the position of the mover calculated by the position calculation was low due to the influence of the above. However, in the present invention, since the mass spring ratio is calculated for each linear vibration motor, the position calculation is performed individually. This is performed without being affected by the variation of the mass spring ratio between the linear vibration motors. That is, the mass spring ratio used for the position calculation can be set to an accurate value corresponding to each linear vibration motor, and the accuracy of the position calculation can be improved.

  In the present invention, the process of calculating the mass spring ratio is performed after assembling the linear vibration motor. There is also an effect as follows.

  That is, in the method of determining the mass spring ratio used for the position calculation of the mover at the time of assembling the linear vibration motor, not only the number of complicated steps for correcting the mass spring ratio at the time of assembly increases, but also the mass spring ratio is determined. Will be combined with the motor drive device adjusted to correspond to the determined mass spring ratio. As a result, if either the linear vibration motor or the motor drive device fails, both Replacement is required.

  On the other hand, in the present invention, since the process of calculating the mass spring ratio is performed after assembling the linear vibration motor, a process of correcting the mass spring ratio at the time of assembly is not required, and further, the motor is added to the linear vibration motor. Since the mass spring ratio is determined in a state where the driving devices are combined, even if one of the linear vibration motor and the driving device has failed, the mass spring ratio can be determined after replacing the failed one, and There is also an effect that only the replacement of the part that has been performed is sufficient.

  According to the fourteenth aspect of the present invention, in the motor driving device according to the thirteenth aspect, the vibration parameter obtaining unit determines a timing at which the movable element that freely vibrates passes through a fixed relative position with respect to a reference position of the vibration. And a natural frequency detecting unit that detects a natural vibration frequency that is a natural vibration parameter of the mover based on an output of the timing detecting unit, and the mass spring ratio determining unit includes: Multiplying the detected natural vibration frequency by twice the pi, squaring the multiplication result, calculating the reciprocal of a value obtained by squaring the multiplication result, and calculating the mass spring ratio. Because of this feature, an accurate mass spring ratio corresponding to each linear vibration motor can be obtained based on the natural vibration frequency of the mover of each linear vibration motor.

  According to the invention according to claim 15 of the present application, in the motor driving device according to claim 13, the vibration parameter acquisition unit determines a timing at which the movable element that freely vibrates passes through a certain relative position with respect to a reference position of the vibration. A timing detecting section for detecting, and a natural angular frequency detecting section for detecting a natural angular frequency which is a natural vibration parameter of the movable element based on an output of the timing detector, wherein the mass spring ratio determining section Calculates the mass spring ratio by squaring the detected natural angular frequency, finding the reciprocal of a value obtained by squaring the natural angular frequency, and calculating the mass spring ratio. An accurate mass spring ratio corresponding to the linear vibration motor can be obtained based on the natural angular frequency of the mover of the motor.

  According to the invention according to claim 16 of the present application, in the motor drive device according to claim 13, the vibration parameter acquiring unit determines a timing at which the movable element that freely vibrates passes a certain relative position with respect to a reference position of the vibration. A timing detecting unit for detecting, based on an output of the timing detector, a natural vibration period detecting unit for detecting a natural vibration period that is a natural vibration parameter of the movable element, the mass spring ratio determining unit includes: The detected natural vibration period is divided by twice the pi, the result of the division is squared, and the mass spring ratio is calculated. An accurate mass spring ratio corresponding to the linear vibration motor can be obtained based on the natural vibration period.

  According to the invention according to claim 17 of the present application, there is provided a motor drive device for driving a linear vibration motor having a movable member provided so as to be able to reciprocate and a spring member supporting the movable member, wherein the linear vibration motor A motor driver that applies a drive voltage to the motor, a current detector that detects a current supplied from the motor driver to the linear vibration motor, and a voltage detector that detects a voltage supplied to the linear vibration motor from the motor driver A resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor from the detected current and the detected voltage, and a resonance drive frequency that is detected by the resonance frequency detection unit. Multiplying by two, squaring the result of the multiplication, finding the reciprocal of the value obtained by squaring the result of the multiplication, and calculating the mass spring ratio And a mover position calculation unit that calculates the position of the mover using the mass spring ratio calculated by the mass spring ratio determination unit, so that an accurate mass spring ratio is obtained. There is an effect that the position calculation for calculating the position of the mover can be performed with high accuracy.

  Further, in the present invention, the process of calculating the mass spring ratio is performed after assembling the linear vibration motor, so that the calculation of the mass spring ratio is compared with a case where the calculation is performed at the time of assembling the linear vibration motor. When the linear spring motor is combined with the motor drive, the mass spring ratio is determined without the need for a step of correcting the mass spring ratio, and one of the linear vibration motor and the drive unit fails. In this case, it is possible to determine the mass spring ratio after replacing the failed one, and there is an effect that only the failed part needs to be replaced.

  According to the eighteenth aspect of the present invention, in the motor driving device according to any one of the thirteenth to sixteenth aspects, the timing detection section is generated in a winding of the linear vibration motor by free vibration of the mover. Using the induced voltage, the timing at which the movable element that vibrates freely passes through a certain relative position with respect to the reference position of the vibration is detected. Instead of using a dedicated position sensor, calculation can be performed using components such as an existing voltage detector. As a result, the number of components can be reduced, and the size and cost can be reduced.

  According to the invention as set forth in claim 19 of the present application, in the motor drive device according to any of claims 13 to 16, the mover forcibly oscillating portion mechanically moves the mover so that the mover freely vibrates. Since a force is applied, the mover forced vibration section can be realized by a simple mechanism.

  According to the twentieth aspect of the present invention, in the motor drive device according to any one of the thirteenth to sixteenth aspects, the movable element forced vibration section supplies the linear vibration motor to the movable element so that the movable element freely vibrates. Since the current is temporarily interrupted, it is possible to realize using existing parts, for example, a motor driver, without using a dedicated part as the mover forced vibration part, As a result, the number of parts is reduced, and the size and cost can be reduced. In addition, when the linear vibration motor is hermetically sealed and, for example, a mechanical force cannot be applied to the internal mover, it is needless to say that the method of freely vibrating the mover of the present invention is effective.

  According to the invention of claim 21 of the present application, in the motor drive device according to any one of claims 13 to 16, the movable element forced vibration section controls the load connected to the linear vibration motor to the movable element. Is separated from the linear vibration motor so that it freely vibrates, so that it can be realized using existing parts, for example, a motor driver or the like, without using a dedicated part as the mover forced vibration part. As a result, the number of components is reduced, and the size and cost can be reduced. In addition, when the linear vibration motor is hermetically sealed and, for example, a mechanical force cannot be applied to the internal mover, it is needless to say that the method of freely vibrating the mover of the present invention is effective.

  According to the invention of claim 22 of the present application, in the motor driving device according to any one of claims 13 to 17, the operation mode is set to drive the linear vibration motor to drive a load connected to the linear vibration motor. Operating mode, and a control unit for setting the operation mode to one of the calculation mode for calculating the mass spring ratio, wherein the control unit temporarily calculates the operation mode before starting the operation of the load. The mass spring ratio calculation unit calculates the mass spring ratio in a calculation mode before the operation of the load starts, and the mover position calculation unit calculates the mass spring ratio in the operation mode. The position of the mover is calculated using the mass spring ratio calculated before the start of the operation of the load, so that the mass spring ratio in the latest state of the linear vibration motor is always used, The position of the mover Becomes the operation for output is performed, Therefore, even if the change in mass-spring ratio over time, there is an effect that it is possible to perform high position calculation accuracy

  According to the invention according to claim 23 of the present application, in the motor driving device according to any one of claims 13 to 17, the operation mode is set such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Operating mode and a calculation mode for calculating the mass spring ratio, the control unit setting the operation mode temporarily after the operation of the load is completed. The mass spring ratio calculation unit calculates the mass spring ratio in a calculation mode after the end of the operation of the load, and the mover position calculation unit sets the most recently set in the operation mode. The position of the mover is calculated using the mass spring ratio calculated in the calculated operation mode, so that the movable mass is always calculated using the mass spring ratio in the latest state of the linear vibration motor. Child position Becomes the calculation for calculating is performed, Therefore, even if the change in mass-spring ratio over time, there is an effect that it is possible to perform high position calculation accuracy.

  Further, according to the present invention, since the calculation of the mass spring ratio is performed immediately after the operation of the linear vibration motor, the mass spring ratio is calculated in a state where the motor temperature is substantially equal to when the motor is actually operating. Become. In other words, the mass spring ratio changes depending on the temperature, but by calculating the mass spring ratio based on the temperature at which the motor actually operates, it is possible to obtain an accurate mass spring ratio during operation of the linear vibration motor, There is an effect that the position calculation for calculating the position of the mover can be performed with higher accuracy.

  Further, in the present invention, since the calculation of the mass spring ratio is performed after the operation is stopped, there is an effect that the operation of calculating the mass spring ratio does not hinder the driving of the linear vibration motor.

  According to the invention according to claim 24 of the present application, in the motor drive device according to any one of claims 13 to 17, the operation mode is set such that the linear vibration motor is driven to drive a load connected to the linear vibration motor. Operating mode, a control unit for setting one of the operation modes for calculating the mass spring ratio, a temperature detecting unit for detecting the temperature of the linear vibration motor, and a mass spring ratio in an operation state of the load. And a mass-spring-ratio estimating unit for estimating, at least one of before or after the start of the operation of the load, the operation mode is temporarily set to the operation mode, The mass spring ratio number estimating unit is based on the calculated mass spring ratio and the temperature detected by the temperature detecting unit when the mass spring ratio is calculated in the calculation mode. Deriving the relationship between the temperature of the linear vibration motor and its mass spring ratio, and operating the load from the relationship between the temperature and the mass spring ratio based on the temperature detected by the temperature detector in the operation mode. Since the mass spring ratio in the state is estimated, and the mover position calculating unit calculates the position of the mover using the estimated mass spring ratio in the operation mode, An accurate mass spring ratio is always used in the position calculation of the mover performed in the operation state of the linear vibration motor, and the accuracy of the position calculation of the mover can be improved.

  Further, in the present invention, since the mass spring ratio of the linear vibration motor in the operating state is estimated from the temperature when the operation of the linear vibration motor is actually performed, the state in which the temperature change of the linear vibration motor is large is large. However, there is an effect that the position calculation of the mover can be performed with high accuracy by using an accurate mass spring ratio.

  According to the invention according to claim 25 of the present application, there is provided an air conditioner including a compressor that has a cylinder and a piston and compresses a fluid in the cylinder by reciprocating motion of the piston, the reciprocating motion being provided. A linear vibration motor having a mover, a spring member supporting the mover, and reciprocating the piston; and a motor drive device for driving the linear vibration motor, wherein the motor drive device is a motor drive device. The motor drive device according to any one of 1, 5, 13, and 17, wherein the spring constant or the mass spring ratio is calculated in the non-operation mode of the linear vibration motor, and the operation mode of the linear vibration motor Then, the position of the mover of the linear vibration motor is calculated by the calculation using the calculated spring constant or mass spring ratio. For this reason, in an air conditioner in which a linear vibration motor is housed in a closed container and used in an environment where the temperature and pressure fluctuate rapidly, the position of the mover of the linear vibration motor is determined by using a spring constant without using a position sensor. Alternatively, it is possible to calculate with high accuracy by calculation using the mass spring ratio, thereby reducing the clearance between the piston and the cylinder head, and reducing the size of the compressor and, consequently, the size of the air conditioner. be able to.

  Also, in this air conditioner, the piston of the compressor is driven by a linear vibration motor, so that the friction loss is reduced and the pressure of the refrigerant is increased, as compared with a conventional rotary type motor that drives the piston of the compressor. Compressor efficiency can be increased by improving sealing performance with low pressure. In addition, lubricating oil, which is indispensable for a rotary motor, can be significantly reduced by reducing friction loss. This not only enhances the recyclability, but also reduces the amount of refrigerant dissolved in the oil, thereby reducing the amount of refrigerant to be charged into the compressor, thereby contributing to the preservation of the global environment.

  According to the invention according to claim 26 of the present application, there is provided a refrigerator having a cylinder and a piston, and a compressor for compressing a fluid in the cylinder by reciprocating motion of the piston, wherein the movable element is provided to be reciprocally movable. And a spring member that supports the mover, a linear vibration motor that reciprocates the piston, and a motor drive device that drives the linear vibration motor. The motor drive device according to any one of 5, 13 and 17, wherein the linear vibration motor is housed in an airtight container, and is used in an environment where the temperature and pressure change greatly. Similar to the above air conditioner, the position of the mover of the linear vibration motor is calculated with high accuracy by using a spring constant or a mass spring ratio without using a position sensor. It becomes possible. As a result, the clearance between the piston and the cylinder head can be reduced, and the size of the compressor can be reduced, and the size of the refrigerator can be reduced.

  Also, in this refrigerator, the piston of the compressor is driven by a linear vibration motor, so that the compressor efficiency is improved by reducing the friction loss and improving the sealing performance compared to the conventional type, in which the piston of the compressor is driven by a rotary motor. In addition, by greatly reducing the amount of lubricating oil by reducing frictional loss, recyclability is increased and the refrigerant charging amount of the compressor is reduced, which can contribute to the preservation of the global environment.

  According to the invention according to claim 27 of the present application, there is provided a cryogenic refrigerator having a cylinder and a piston, and a compressor for compressing a fluid in the cylinder by the movement of the piston, and is provided so as to be capable of reciprocating movement. A linear vibration motor having a mover, a spring member supporting the mover, and driving the piston; and a motor driving device for controlling the driving of the linear vibration motor. According to the present invention, there is provided a motor drive device according to any one of 1, 5, 13, and 17, wherein the linear vibration motor is housed in a closed container, and is used in an environment where temperature and pressure change rapidly. In the low-temperature refrigerator, the position of the mover of the linear vibration motor can be calculated with high accuracy by using a spring constant or a mass spring ratio without using a position sensor, similarly to the air conditioner described above. It can be out to become. As a result, the clearance between the piston and the cylinder head can be reduced, and the size of the compressor can be reduced, and the size of the cryogenic refrigerator can be reduced.

  In addition, in this cryogenic refrigerator, the piston of the compressor is driven by a linear vibration motor, so compared to a conventional rotary motor that drives the piston of the compressor, friction loss is reduced and sealing performance is improved. Compressor efficiency can be improved, and significant reduction of lubricating oil by reducing frictional loss improves recyclability and reduces the amount of refrigerant charged in the compressor, contributing to the preservation of the global environment. Can be.

  According to the invention according to claim 28 of the present application, there is provided a water heater having a cylinder and a piston, and a compressor for compressing a fluid in the cylinder by the movement of the piston, wherein the mover is provided so as to be able to reciprocate. A linear vibration motor that drives the piston, and a motor drive device that drives and controls the linear vibration motor, the motor drive device comprising: The water heater according to any one of 5, 13 and 17, wherein the linear vibration motor is housed in an airtight container and used in an environment where temperature and pressure change rapidly. As in the above air conditioner, the position of the mover of the linear vibration motor can be calculated with high accuracy by using a spring constant or a mass spring ratio without using a position sensor. It can become. As a result, the clearance between the piston and the cylinder head can be reduced, and the size of the compressor can be reduced, and the size of the water heater can be reduced.

  In addition, in this water heater, the piston of the compressor is driven by a linear vibration motor. Therefore, compared to the conventional type in which the piston of the compressor is driven by a rotary motor, the compressor has a reduced friction loss and improved sealing performance. Efficiency can be increased, and significant reduction in lubricating oil by reducing frictional loss increases recyclability and reduces the refrigerant charge of the compressor, contributing to the preservation of the global environment. .

  According to the invention according to claim 29 of the present application, there is provided a mobile phone including a linear vibration motor that generates vibration, and a motor drive device that drives and controls the linear vibration motor, wherein the linear vibration motor is capable of reciprocating motion. , And a spring member that supports the mover, wherein the motor drive device is the motor drive device according to any one of claims 1, 5, 13, and 17. The vibration can be transmitted to the outside with two degrees of freedom, the frequency and the magnitude of the amplitude (vibration). Therefore, compared to the conventional type that generates vibration using a rotary motor, Therefore, a variety of vibration variations can be obtained. Further, the motor driving device calculates the spring constant or the mass spring ratio in the non-operation mode of the linear vibration motor, and in the operation mode of the linear vibration motor, determines the position of the mover using the calculated spring constant or the mass spring ratio. Since the calculation is performed, the position of the mover can be detected with high accuracy during the operation of the linear vibration motor. As a result, the clearance between the mover and its peripheral members can be reduced, and the size of the linear vibration motor can be reduced, and the size of the mobile phone can be reduced.

Hereinafter, embodiments of the present invention will be described.
(Embodiment 1)
FIG. 1 is a block diagram for explaining a motor drive device according to Embodiment 1 of the present invention.
The motor driving device 101a according to the first embodiment has two operation modes for operating the linear vibration motor. One operation mode is an operation mode in which the linear vibration motor 100 is driven by a driving voltage or a driving current according to a required motor output to drive a load connected to the linear vibration motor 100. In this operation mode, the motor driving device 101a performs the operation of the load, calculates the position of the mover of the linear vibration motor based on the drive voltage and the drive current, and responds to the calculated position of the mover. To control the drive of the linear vibration motor. The other operation mode is an operation mode in which the mover of the linear vibration motor 100 is freely vibrated to calculate the spring constant k of the spring member supporting the mover.

  Specifically, the motor driving device 101a according to the first embodiment includes a motor driver 1a that drives and controls the linear vibration motor 100 based on position information Dpc indicating a position Px of the mover, and a position of the mover. A mover position calculator 2a for calculating the position for calculating Px based on the spring constant k of the spring member of the linear vibration motor 100;

  The motor driving device 101a includes a mover forced vibration unit 3a that temporarily applies a force (forced vibration force) Ffv so that the mover of the linear vibration motor 100 freely vibrates. A relative position detector 4a for detecting a timing at which the mover has passed a fixed relative position Pr with respect to a vibration reference position such as a vibration center thereof, and outputting timing information Dpr indicating the detected timing; Based on the timing information Dpr from 4a, a natural vibration frequency detecting unit 5a that detects the natural vibration frequency f of the mover, and a spring constant k of the spring member is determined from the detected natural vibration frequency f, and the determined natural constant is determined. A spring constant determining unit 6a that outputs spring constant information Dk indicating a spring constant to the mover position detecting unit 2a. Strictly speaking, the natural vibration frequency f is a natural vibration frequency of a spring vibration system including the mover.

  The motor drive device 101a has a control unit (not shown) that controls each unit 1a, 2a, 3a, 4a, 5a, 6a of the motor drive device 101a based on an operation signal or the like according to a user operation. Immediately before the start of the operation of the linear vibration motor, the operation mode of the motor drive device 101a is temporarily changed to an operation mode for calculating the spring constant under the control of the control unit, and thereafter, an operation mode for operating the load. It becomes.

  Hereinafter, the linear vibration motor 100, the motor driver 1a, the mover position calculation unit 2a, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration frequency detection unit 5a, and the spring that constitute the motor drive device 101a The constant determining unit 6a will be described in detail.

  The linear vibration motor 100 has a stator and a mover, and a spring member that supports the mover so that a spring vibration system including the mover is formed. The driving frequency of the linear vibration motor is: The resonance frequency of the reciprocating motion of the mover, that is, the resonance vibration frequency of the spring vibration system, or a vibration frequency in the vicinity thereof. Further, the stator is formed of an electromagnet formed by winding a coil around an iron core, and the mover is formed of a permanent magnet.

  The motor driver 1a receives the power supply voltage, applies the drive voltage Vdr to the linear vibration motor 100, and drives the linear vibration motor 100. Usually, an AC voltage is applied to the linear vibration motor 100 as a drive voltage Vdr, and an AC current is supplied to the linear vibration motor 100 as a drive current Cdr. The motor driver 1a can reciprocate the mover of the linear vibration motor 100 at the same frequency as the AC voltage by applying an AC voltage to the linear vibration motor 100 as the drive voltage Vdr. is there. When a DC voltage is applied to the linear vibration motor 100, the mover receives a constant electromagnetic force. In addition, the motor driver 1a determines the level (peak value) of the drive voltage (AC voltage) Vdr based on the position information Dpc indicating the position Px of the mover obtained by the calculation in the mover position calculator 2a. ).

  The mover position calculation unit 2a calculates the position Px of the mover during the operation of the linear vibration motor 100, that is, in a state where the mover is performing reciprocating operation, and obtains position information Dpc indicating the position of the mover. Is output to the motor driver 1a.

  As a specific calculation, a position calculation for calculating the position of the mover from the equation of motion of the linear vibration motor 100 as described in Patent Document 2 (Japanese Patent Application Laid-Open No. 8-508558) cited in the description of the background art. Is used. At this time, the spring constant k used for calculating the position of the mover is determined by the spring constant determining unit 6a.

  The mover forced vibration unit 3a mechanically applies the forced vibration force Ffv to the mover from outside the linear vibration motor. When the forced vibration force Ffv is applied to the mover, the mover Vibrates freely. Such a mover forced vibration part 3a can be realized by a simple mechanism.

  However, there is a case where the housing (motor housing) of the linear vibration motor 100 is hermetically closed, and a force cannot be directly applied to the mover inside from the outside of the motor housing. In such a case, the mover forced vibration unit 3a applies an electromagnetic force to the mover by the current supplied to the linear vibration motor 100. As a specific method of applying the electromagnetic force to the mover, for example, a method of instantaneously stopping the current supplied from the motor driver 1a to the linear vibration motor 100 can be considered. That is, when the current supplied from the motor driver 1a to the linear vibration motor 100 is momentarily stopped, the mover supported by the spring member vibrates freely. Such a mover forced vibration unit can be realized by using an existing component, for example, a motor driver, without using a dedicated component, and as a result, the number of components is reduced, and the size and cost are suppressed. it can.

  Further, the instantaneous stopping of the current supplied to the linear vibration motor 100 may be performed in a normal driving state of the linear vibration motor 100, that is, in a state in which the mover is reciprocating. The supply of the direct current may be stopped in a state where the direct current is supplied from the motor driver 1a to the stopped linear vibration motor 100 and the electromagnetic force is applied to the movable element. In this case, since the linear vibration motor 100 is not in the operating state, that is, since no load is applied to the linear vibration motor 100, the free vibration of the mover may be a vibration of a desired amplitude which is not affected by the load. it can.

  Further, the mover forced vibration section 3a may separate the load connected to the linear vibration motor from the linear vibration motor so that the mover freely vibrates. In this case, the mover forced vibration unit 3a can be realized using an existing component, for example, a motor driver without using a dedicated component, and as a result, the number of components is reduced, and the size and cost are reduced. Can be. Further, the mover forcibly vibrating section 3a for freely vibrating the mover by disconnecting the load connected to the linear vibration motor as described above has a linear vibration motor sealed therein. It is needless to say that this is effective when a force cannot be applied.

  The relative position detecting unit 4a detects a timing at which the movable element of the linear vibration motor 100 has passed a fixed relative position Pr with respect to a reference position such as a vibration center in a state where the movable element is freely vibrating, It outputs timing information Dpr indicating the detected timing. Specifically, it is conceivable to use a position sensor using a Hall element or the like for the relative position detection unit 4a. However, the relative position detector 4a may be any device as long as it can determine the natural vibration frequency f of the mover from the timing information Dpr output from the relative position detector 4a. In other words, the position sensor used for the relative position detection unit 4a may be a simple one, and it is sufficient if the timing detection accuracy and the frequency response are not so high.

  In addition, as a method of detecting that the movable element that freely oscillates has passed the relative position, a method of using an induced voltage of the linear vibration motor 100 instead of the method using the position sensor may be considered. The specific method is as follows. With the output of the motor driver 1a open, that is, with the motor driver 1a disconnected from the linear vibration motor, the linear vibration motor 100 This is a method for measuring an induced voltage generated in a wire connected to the, ie, a winding constituting an electromagnet.

  The natural vibration frequency detector 5a detects the natural vibration frequency f of the movable element from the timing information Dpr output from the relative position detector 4a. Specifically, based on the timing information Dpr from the relative position detecting unit 4a, the natural vibration frequency detecting unit 5a allows the movable element that freely vibrates to pass a certain fixed point (that is, the relative position) per unit time. This is to detect the number of times to perform. Generally, the center of vibration of the mover is selected as the relative position Pr.

  In other words, the natural vibration frequency detecting unit 5a detects how many times the movable element has passed a certain fixed point (relative position) within a fixed time, and detects the natural vibration frequency f of the movable element. Note that the accuracy of detecting the natural vibration frequency can be increased by increasing the certain time.

  The natural vibration frequency detecting unit 5a measures the time from when the mover passes through the relative position (a certain fixed point) to when the mover passes through the relative position again, and calculates the time from the measured time (measurement time). The cycle of the natural vibration may be obtained, and the reciprocal thereof may be obtained as the natural vibration frequency. Also in this case, the accuracy of detecting the natural vibration frequency can be improved by measuring the time required for the mover to pass the relative position twice or more, for example, many times such as 10 or 20 times. it can.

  The spring constant determining unit 6a determines a spring constant k from the natural vibration frequency f detected by the natural vibration frequency detecting unit 5a. Here, specifically, the spring constant determining unit 6a multiplies the natural vibration frequency f by twice the pi, squares the multiplication result, and further squares the multiplication result with the movable element of the mover. The arithmetic processing for multiplying the mass is performed to calculate the spring constant k.

Next, the operation will be described.
In the motor driving device 101a according to the first embodiment, when a command signal for instructing the operation start of the linear vibration motor is input to the control unit by a user operation, each unit 1a, 2a, 3a, 4a of the motor driving device 101a. , 5a, and 6a are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101a temporarily becomes the operation mode, and then becomes the operation mode.

First, the operation in the calculation mode for determining the spring constant k of the spring member of the linear vibration motor 100 will be described.
The mover forced vibration unit 3a applies a forced vibration force Ffv to the mover of the linear vibration motor 100 based on a control signal from a control unit (not shown) in the operation mode, that is, in a non-operation state of the linear vibration motor 100. The mover is oscillated freely by applying a voltage temporarily.

  The relative position detector 4a outputs timing information Dpr indicating the passage timing of the movable element every time the movable element passes the relative position in a state where the movable element of the linear vibration motor 100 is freely vibrating. I do.

  The natural vibration frequency detector 5a detects the natural vibration frequency f of the mover based on the timing information Dpr from the relative position detector 4a. Specifically, based on the timing information Dpr, the natural vibration frequency detecting unit 5a detects how many times the freely vibrating mover has passed the relative position within a predetermined time, and determines the natural vibration of the mover. The frequency f is obtained, and frequency information Df indicating the natural frequency f is output.

  The spring constant determining unit 6a multiplies the natural frequency f indicated by the frequency information Df by twice the pi based on the frequency information Df from the natural frequency detecting unit 5a, and squares the multiplication result. Further, an arithmetic process of multiplying the square of the multiplication result by the mass of the mover is performed to calculate a spring constant k, and spring constant information Dk indicating the spring constant is output to the mover position calculator 2a. I do.

  Thereafter, the operation mode of the motor driving device 101a is switched from the calculation mode to the operation mode for operating the linear vibration motor.

Hereinafter, an operation in an operation mode for driving the linear vibration motor 100 will be described.
The motor driver 1a drives the linear vibration motor 100 by applying an AC voltage (drive voltage) Vdr to the linear vibration motor 100. Thus, the normal operation of the linear vibration motor 100 is started.

  At this time, the mover position calculation unit 2a performs a position calculation for calculating the position of the mover based on the drive current Cdr and the drive voltage Vdr applied to the motor driver 1a, using the spring calculated by the spring constant determination unit 6a. The calculation is performed using the constant k, and the calculated mover position information Dpc indicating the position Px of the mover is output to the motor driver 1a.

  Then, based on the position information Dpc, the motor driver 1a controls the amplitude value (voltage level) of the drive voltage Vdr applied to the linear vibration motor 100 so that the reciprocating movable element does not exceed the limit position.

  As described above, in the first embodiment, in the motor driving device 101a that drives the linear vibration motor 100, the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100, and the movable element that freely vibrates, A relative position detector 4a for detecting the timing of passing through a certain fixed point (relative position), a natural vibration frequency detector 5a for detecting the natural vibration frequency f of the mover based on the timing information Dpr from the detector 4a. And the spring constant k of the spring member is determined from the detected natural vibration frequency f. Therefore, the position of the mover can be calculated with high accuracy by position calculation using the spring constant k.

  This makes it possible to accurately control the position of the mover during operation of the linear vibration motor, and to reduce the clearance between the mover and the linear vibration motor housing to reduce the size or increase the output of the linear vibration motor. There is an effect that can be achieved.

  In the first embodiment, the spring constant k of the linear vibration motor is calculated immediately before the start of the operation of the linear vibration motor 100. Therefore, the spring constant k in the state of the latest linear vibration motor is always used. Thus, the position calculation for calculating the position of the mover is performed. For this reason, even if the spring constant k changes with the passage of time, there is an effect that the position calculation can accurately calculate the position of the mover.

  In the first embodiment, the calculation of the spring constant is performed after assembling the linear vibration motor in which the motor driving device is connected to the linear vibration motor. As compared with the case where the linear vibration motor is not connected to the motor driving device when assembling, the following effects are also obtained.

  In other words, when assembling the linear vibration motor, when calculating the spring constant used for the position calculation of the mover, the calculated spring constant value of each linear vibration motor is used for the motor drive combined with each linear vibration motor. The device needs to be held.

  For example, in a motor drive device that performs an operation to obtain the position of the mover by hardware, the default value of the spring constant is determined by adjusting the volume of an active component such as a resistor, so that the calculated spring of the linear vibration motor to be combined is adjusted. Set to a constant value. Further, in a motor drive device that performs an operation for obtaining the position of the mover by software, the default value of the spring constant stored in the microcomputer is rewritten to the value of the spring constant calculated at the time of assembly, or as described above. The value of the calculated spring constant is set by adjusting the volume of the active component such as the resistance.

  Therefore, when calculating the spring constant at the time of assembling the linear vibration motor, a complicated step of correcting the default value of the spring constant of each motor at the time of assembling increases. In this case, when the motor driving device is combined with the linear vibration motor, the default value of the spring constant of the motor driving device is set to the calculated spring constant of the combined linear vibration motor. If either the linear vibration motor or the motor drive fails, both must be replaced.

  On the other hand, when the spring constant is calculated after assembling the linear vibration motor as in the first embodiment of the present invention, a complicated process of correcting the default value of the spring constant of the motor driving device is unnecessary at the time of assembly. . Furthermore, the value of the spring constant held by the motor drive device is set in a state where the motor drive device is connected to the linear vibration motor, so if one of the linear vibration motor and the motor drive device fails, After replacing the faulty one, the spring constant of the motor drive can be set. That is, when one of the linear vibration motor and the motor driving device fails, there is also an effect that only the failed one needs to be replaced.

  In the first embodiment, the motor driving device 101a calculates the spring constant k of the linear vibration motor 100 immediately before the operation of the linear vibration motor 100 starts. The spring constant k of the linear vibration motor may be calculated immediately after the operation of the motor 100 is completed.

  In this case, during the operation of the linear vibration motor, the position calculation for calculating the position of the mover is performed using the spring constant k calculated immediately after the previous operation of the linear vibration motor. Therefore, also in this case, the position calculation for calculating the position of the mover using the spring constant k in the state of the latest linear vibration motor is always performed. There is an effect that the position of the mover can be accurately calculated by the calculation.

  In this case, since the calculation of the spring constant is performed immediately after the end of the operation of the linear vibration motor, the spring constant is calculated in a state where the motor temperature is substantially equal to the temperature during the operation of the actual linear vibration motor. It will be. In other words, the spring constant changes depending on the temperature. By calculating the spring constant based on the temperature at which the motor actually operates, it is possible to obtain an accurate spring constant during operation of the linear vibration motor. There is an effect that the position calculation for calculating the position can be performed with higher accuracy.

  Further, in the above case, since the calculation of the spring constant is performed after the operation of the linear vibration motor is stopped, there is an effect that the spring constant can be calculated without hindering the operation of the linear vibration motor.

  In the first embodiment, when the command signal indicating the start of the operation of the linear vibration motor is input to the control unit by the user's operation, the motor driving device 101a temporarily changes the operation mode to the calculation mode. Although it is assumed that the operation mode is set to the operation mode, the motor drive device is not limited to this. For example, the operation of the operation mode and the operation of the operation mode are independent based on a command signal generated by a user operation. May be performed.

(Embodiment 2)
FIG. 2 is a block diagram illustrating a motor driving device 101b according to a second embodiment of the present invention.
The motor driving apparatus 101b according to the second embodiment is different from the motor driving apparatus according to the first embodiment only in that a spring constant k used for position calculation for calculating the position of the mover is calculated based on the natural angular frequency ω of the mover. It is different from the driving device 101a.

  That is, the motor driving device 101b according to the second embodiment has a timing at which the movable member that freely vibrates passes through a fixed point (relative position) instead of the natural vibration frequency detecting unit 5a of the motor driving device 101a according to the first embodiment. The natural angular frequency detecting section 5b for detecting the natural angular frequency (natural angular velocity) ω of the mover based on the above, and the natural angular frequency replacing the spring constant determining section 6a of the motor driving device 101a of the first embodiment. and a spring constant determining unit 6b for calculating a spring constant k of the spring member based on ω.

  Hereinafter, the motor driver 1a, the mover position calculation unit 2a, the mover forced vibration unit 3a, the relative position detection unit 4b, the natural angular frequency detection unit 5b, and the spring constant determination unit 6b that constitute the motor drive device 101b will be described in detail. explain.

  Here, the motor driver 1a, the mover position calculating unit 2a, and the mover forced vibration unit 3a are the same as those in the motor driving device 101a of the first embodiment.

  The relative position detection unit 4b detects timings at which the mover has passed two relative positions (first and second relative positions) with respect to a reference position such as a vibration center, and indicates a timing indicating the detected timing. It outputs information Dpr.

  The natural angular frequency detecting unit 5b detects the natural angular frequency (natural angular speed) ω of the mover based on the detection information Dpr from the relative position detecting unit 4b, and obtains angular frequency information indicating the natural angular frequency ω. Dω is output. A specific method of detecting the natural angular frequency ω includes a first method of dividing the maximum value Mv0 of the speed Mv of the mover by the maximum value Mx0 of the displacement Mx of the mover, and a method of maximizing the acceleration Ma of the mover. A second method of dividing the value Ma0 by the maximum value Mv0 of the speed Mv of the mover, dividing the maximum value Ma0 of the acceleration Ma of the mover by the maximum value Mx0 of the displacement Mx of the mover, and calculating the value obtained by the division There is a third method, such as taking the square root. However, here, the natural angular frequency detection unit 5b performs the first method based on the timing at which the mover passes through the two relative positions indicated by the timing information Dpr from the relative position detection unit 4b. That is, the natural angular frequency (natural angular velocity) ω of the mover is detected using the maximum value Mv0 of the speed Mv of the mover and the maximum value Mx0 of the displacement Mx.

Hereinafter, the first to third methods will be briefly described.
The displacement Mx, velocity Mv, and acceleration Ma of the mover are represented by the following equations (5) to (7) as a function of time t.
Mx = Mx0 · sin (ωt) (5)
Mv = Mv0 · sin (ωt) (6)
Ma = Ma0 · sin (ωt) (7)

Further, since the velocity Mv is obtained by differentiating the displacement Mx, the above equation (6) is transformed into the following equation (8).
Mv = (Mx) ′ = Mx0 · ω · cos (ωt) (8)

Further, since the acceleration Ma is obtained by differentiating the velocity Mv, the above equation (7) is transformed into the following equation (9).
Ma = (Mv) ′ = Mv0 · ω · cos (ωt) (9)

Further, since the acceleration Ma is obtained by two differentiations of the displacement Mx, the above equation (7) is transformed into the following equation (10).
Ma = ((Mx) ′) ′ = − Mx0 · ω · ω · sin (ωt) (10)
Here, () ′ indicates differentiation.

  Accordingly, from the above (8), the maximum value Mv0 of the velocity Mv is the product of the maximum value Mx0 of the displacement and the angular frequency ω, and the angular frequency ω is the maximum value Mv0 of the velocity Mv of the movable element and the displacement of the movable element. It is obtained by dividing by the maximum value Mx0 of Mx (first method).

  Further, from the above (9), the maximum value Ma0 of the acceleration Ma is the product of the maximum value Mv0 of the speed and the angular frequency ω, and the angular frequency ω is the maximum value Ma0 of the acceleration Ma of the mover and the speed of the mover. It is obtained by dividing by the maximum value Mv0 of Mv (second method).

  From the above (10), the maximum value Ma0 of the acceleration Ma is the product of the maximum value Mx0 of the displacement and the square of the angular frequency ω, and the angular frequency ω is the maximum value Ma0 of the acceleration Ma of the movable element. Is obtained by dividing by the maximum value Mx0 of the displacement Mx, and taking the square root of the division result (third method).

The spring constant determining unit 6b determines a spring constant from the angular frequency ω detected by the natural angular frequency detecting unit 5b, and outputs spring constant information Dk indicating the determined spring constant k. Specifically, the calculation for obtaining the spring constant k (= ω ² · m) in the spring constant determining unit 6b is performed by squaring the natural angular frequency ω indicated by the frequency information Dω from the natural angular frequency detecting unit 5b. This is an operation of multiplying the mass m of the mover.

Next, the operation will be described.
In the motor drive device 101b according to the second embodiment, when a command signal for instructing the start of operation of the linear vibration motor is input to the control unit by a user operation, each unit of the motor drive device 101b is similar to the first embodiment. The control units 1a, 2a, 3a, 4b, 5b, and 6b control the operation mode of the motor drive device 101b to be in the operation mode once and then to the operation mode based on a control signal from a control unit (not shown). Is done.

First, the operation in the calculation mode for determining the spring constant k of the spring member of the linear vibration motor 100 will be described.
In the motor driving device 101b according to the second embodiment, the mover forced vibration unit 3a operates in the same manner as the motor driving device 101a according to the first embodiment.

  In the second embodiment, the relative position detector 4b determines the timing at which the freely vibrating movable element passes through the first relative position and the timing at which the movable element passes through the second relative position. The information Dpr is output.

  The natural angular frequency detection unit 5b detects the natural angular vibration frequency ω of the mover based on the timing information Dpr from the relative position detection unit 4b, and outputs angular frequency information Dω indicating the natural angular vibration frequency ω. Output. Here, the natural angular frequency detection unit 5b calculates the maximum value Mv0 of the speed of the mover and the maximum value Mx0 of the displacement from the timing information Dpr from the relative position detection unit 4b, and calculates the maximum value Mv0 of the speed of the mover. This natural angular frequency ω is detected by an operation of dividing by the maximum value Mx0 of the displacement of the mover.

The spring constant determining unit 6b receives the angular frequency information Dω from the natural angular frequency detecting unit 5b, squares the natural angular frequency ω indicated by the angular frequency information Dω, and multiplies by the mass m of the mover. The calculation is performed to calculate a spring constant k (= ω ² · m), and spring constant information Dk indicating the spring constant k is output.

Thereafter, the operation mode of the motor driving device 101b is switched from the calculation mode to the operation mode.
The motor driving device 101b according to the second embodiment operates in the operation mode in the same manner as the first embodiment.

  As described above, in the second embodiment, in the motor driving device 101b that drives the linear vibration motor 100, the mover forcibly vibrating section 3a that freely vibrates the mover of the linear vibration motor 100 and the mover that freely vibrates are two. A relative position detector 4b for detecting the timing of passing through each of the two fixed points (relative positions), and a natural angle for detecting the natural angular frequency ω of the mover based on the timing information Dpr from the relative position detector 4b. A vibration detecting unit 5b, and determines the spring constant k of the spring member from the detected natural angular frequency ω, so that the position of the mover obtained by the position calculation using the spring constant k is highly accurate. As in the first embodiment, there is an effect that the size and output of the linear vibration motor can be reduced.

  In the second embodiment, as in the first embodiment, the spring constant k of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. However, there is an effect that the position of the mover can be calculated with high accuracy by the calculation using the spring constant k.

  In the second embodiment, the motor driving device 101b calculates the spring constant k of the linear vibration motor immediately before the operation of the linear vibration motor 100 starts. The spring constant k of the linear vibration motor may be calculated immediately after the end of the operation.

(Embodiment 3)
FIG. 3 is a block diagram illustrating a motor driving device according to a third embodiment of the present invention.
The motor driving apparatus 101c according to the third embodiment differs from the motor driving apparatus according to the first embodiment only in that a spring constant k used for position calculation for calculating the position of the mover is calculated based on the natural vibration period T of the mover. It is different from the device 101a.

  That is, the motor driving device 101c according to the third embodiment has a timing at which the movable element that vibrates freely passes through a fixed point (relative position) instead of the natural vibration frequency detection unit 5a of the motor driving device 101a according to the first embodiment. The natural vibration cycle detecting unit 5c that detects the natural vibration cycle T of the mover based on the natural vibration cycle, and the spring constant determining unit 6a of the motor driving device 101a according to the first embodiment. A spring constant determining unit 6c for calculating a spring constant k.

  Hereinafter, the motor driver 1a, the mover position calculation unit 2a, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration period detection unit 5c, and the spring constant determination unit 6c that constitute the motor drive device 101c will be described in detail. I do.

  Here, the motor driver 1a, the mover position calculation unit 2a, the mover forced vibration unit 3a, and the relative position detection unit 4a are the same as those in the motor drive device 101a of the first embodiment.

  The natural vibration cycle detecting section 5c detects the natural vibration cycle T of the mover based on the timing information Dpr from the relative position detecting section 4a, and outputs cycle information Dt indicating the natural vibration cycle T. Specifically, the natural vibration cycle detecting unit 5c determines whether the movable element passes through a certain fixed point and then passes through a certain fixed point again in the same direction based on the timing information Dpr from the relative position detecting unit 4a. It detects time. In other words, the natural oscillation period is determined from the time required for the mover to pass through a certain relative position with respect to the vibration center (generally, the vibration center of the mover itself is selected) and to pass the relative position again. is there. It should be noted that the accuracy of the detection can be improved by using the time for the movable element to make multiple reciprocations instead of the time for the movable element to make one reciprocation for detecting the natural vibration cycle. The detection accuracy can be increased as the number of reciprocations increases.

  The method of obtaining the natural vibration period is not limited to the method of directly detecting the time required for one reciprocation of the mover as described above. There is also a method of detecting the natural vibration frequency and detecting the natural vibration period from the natural vibration frequency. In this case, the detection accuracy of the natural vibration cycle can be increased by increasing the fixed time, that is, the time for measuring the number of times the mover passes through the fixed point.

The spring constant determining unit 6c determines a spring constant k from the natural vibration period T detected by the natural vibration period detecting unit 5c, and outputs spring constant information Dk indicating the spring constant k. Specifically, the calculation for obtaining the spring constant k (= 1 / ((T / 2π) ² · (1 / m)) by the spring constant determining unit 6c is performed by dividing the natural vibration period T by twice the circumference. Then, the result of the division is squared, the square of the result of the division is multiplied by the reciprocal of the mass of the mover, and the reciprocal of the result of the multiplication is obtained.

Next, the operation will be described.
In the motor driving device 101c according to the third embodiment, when a command signal for instructing the start of operation of the linear vibration motor is input to the control unit by a user operation, each unit of the motor driving device 101c is similar to the first embodiment. The control units 1a, 2a, 3a, 4a, 5c, and 6c control the operation mode of the motor drive device 101c once to be in an operation mode and then to an operation mode based on a control signal from a control unit (not shown). Is done.

First, the operation of the linear vibration motor 100 in the calculation mode for determining the spring constant k will be described.
In the motor driving device 101c according to the third embodiment, the mover forced vibration unit 3a and the relative position detection unit 4a operate in the same manner as the motor driving device 101a according to the first embodiment.

  In the third embodiment, the natural vibration cycle detection unit 5c detects the natural vibration cycle T of the mover based on the timing information Dpr from the relative position detection unit 4a, and indicates the natural vibration cycle T. It outputs period information Dt. For example, the time until the mover passes through a fixed point and then passes through a fixed point again in the same direction is detected.

The spring constant determining unit 6c receives the period information Dt from the natural vibration period detecting unit 5c, divides the natural vibration period T indicated by the period information Dt by twice the pi, squares the result of the division, and A spring constant k (= 1 / (T / 2π) ² · (1 / m)) is calculated by multiplying the square of the division result by the reciprocal of the mass of the mover and taking the reciprocal of the multiplication result. It outputs spring constant information Dk indicating the spring constant k.

Thereafter, the operation mode of the motor driving device 101c is switched from the calculation mode to the operation mode.
The motor driving device 101c according to the third embodiment operates in the operation mode in the same manner as the first embodiment.

  As described above, in the third embodiment, in the motor driving device 101c that drives the linear vibration motor 100, the mover forcibly vibrating section 3a that freely vibrates the mover of the linear vibration motor 100 and the fixed part including the mover that freely vibrates are provided. A relative position detector 4a for detecting a timing of passing a point (relative position), and a natural vibration period detector 5c for detecting a natural vibration period T of the mover based on timing information Dpr indicating the detection result. Since the spring constant k of the spring member is determined from the detected natural vibration period T, the position of the mover obtained by the position calculation using the spring constant k is determined to be highly accurate, as in the first embodiment. Therefore, there is an effect that the size and output of the linear vibration motor can be reduced.

  In the third embodiment, the spring constant k of the linear vibration motor is calculated immediately before the start of the operation of the linear vibration motor 100, similarly to the first embodiment. Even so, there is an effect that the position of the mover can be calculated with high accuracy by the calculation using the spring constant.

  In the third embodiment, the motor driving device 101c calculates the spring constant k of the linear vibration motor immediately before the operation of the linear vibration motor 100 is started. The spring constant k of the linear vibration motor may be calculated immediately after the operation of the motor 100 is completed.

(Embodiment 4)
FIG. 4 is a block diagram illustrating a motor driving device according to a fourth embodiment of the present invention.
The motor driving device 101d according to the fourth embodiment has two operation modes for operating the linear vibration motor. One operation mode is an operation mode in which the linear vibration motor 100 is driven by a driving voltage or a driving current according to a required motor output to drive a load connected to the linear vibration motor 100. Another operation mode is a calculation mode in which the drive frequency of the linear vibration motor 100 is adjusted to detect a resonance frequency, and a spring constant k of a spring member supporting the mover is calculated from the resonance frequency. In the operation mode, the motor drive device 101d operates the load and calculates the position of the mover of the linear vibration motor based on the calculated spring constant k, drive current, and drive voltage. The drive of the linear vibration motor is controlled according to the position of the mover.

  Specifically, the motor driving device 101d according to the fourth embodiment includes a motor driver 1d that drives and controls the linear vibration motor 100 based on position information Dpc indicating the position Px of the mover, and a position of the mover. A mover position calculator 2a for calculating the position for calculating Px based on the spring constant k of the spring member of the linear vibration motor 100;

  The motor driving device 101d includes a current detection unit 9d that detects a drive current Cdr supplied to the linear vibration motor 100, a voltage detection unit 10d that detects a drive voltage Vdr supplied to the linear vibration motor 100, A resonance frequency detector 11d that controls the motor driver 1d based on the detected drive current Cdr and drive voltage Vdr to detect a resonance drive frequency f ′ of the linear vibration motor 100; And a spring constant determining unit 6d for determining a spring constant k of the spring member based on the above-mentioned formula, and outputting spring constant information Dk indicating the spring constant k to the mover position detecting unit 2a.

  Further, in the fourth embodiment, the motor driving device 101d controls the respective units 1d, 2a, 6d, 9d, 10d, and 11d of the motor driving device 101d based on an operation signal or the like corresponding to a user operation. Immediately before the start of the operation of the linear vibration motor, the operation mode of the motor drive device 101d is temporarily changed to a calculation mode for calculating a spring constant under the control of the control unit. This is an operation mode for operating the load.

Hereinafter, the linear vibration motor, the motor driver 1d, the mover position calculation unit 2a, the current detection unit 9d, the voltage detection unit 10d, the resonance frequency detection unit 11d, and the spring constant determination unit 6d that constitute the motor drive device 101d will be described. explain in detail.
Here, the linear vibration motor 100 and the mover position calculator 2a are the same as those in the first embodiment.

  The motor driver 1d applies the drive voltage Vdr to the linear vibration motor 100 and controls the drive voltage Vdr. In the operation mode, the drive voltage applied to the linear vibration motor 100 is expressed as In the operation mode, the drive frequency of the linear vibration motor 100 is controlled in accordance with the drive frequency control signal Sfc from the resonance frequency detection unit 11d. The drive voltage is controlled so as to be a frequency.

  Note that, when the AC voltage is applied as the drive voltage, the linear vibration motor 100 can reciprocate the movable element constituting the linear vibration motor 100 at the same frequency as the frequency of the applied voltage. The linear vibration motor 100 generates a certain level of thrust of the mover when a DC voltage is applied as the drive voltage.

  The current detector 9d detects the drive current Cdr supplied from the motor driver 1d to the linear vibration motor 100, that is, indicates the drive current according to a current monitor signal Cmnt obtained by monitoring the drive current Cdr. It outputs a current detection signal Cd. Specific examples of the current detection method include a method using a non-contact current sensor and a method using a shunt resistor.

  The voltage detection unit 10d includes a voltage sensor 10d1 for detecting a drive voltage Vdr supplied from the motor driver 1d to the linear vibration motor 100, and detects the drive voltage Vdr based on an output (sensor output) Vsns of the sensor 10d1. It outputs the voltage detection signal Vd shown. Here, as a specific voltage detection method, a method using a voltage sensor is shown. However, as a drive voltage detection method, a method of directly measuring the drive voltage applied to the linear vibration motor by resistance division or a method of measuring the drive voltage is used. And a method of estimating from the voltage information indicating the drive voltage Vdr generated inside the motor driver 1d.

  The resonance frequency detection unit 11d detects the resonance drive frequency f 'of the linear vibration motor based on the current detection signal Cd of the current detection unit 9d and the voltage detection signal Vd of the voltage detection unit 10d. Specifically, the resonance frequency detection unit 11d sets the drive frequency of the linear vibration motor to a value at which the power supplied to the linear vibration motor is maximized in a state where the amplitude value of the drive current supplied to the linear vibration motor 100 is fixed. The motor driver 1d is controlled so that the frequency becomes a predetermined frequency, a resonance drive frequency (hereinafter, also simply referred to as a resonance frequency) f 'of the linear vibration motor is detected from the drive frequency at which the supplied power becomes maximum, and the resonance frequency f' is detected. Is output.

The spring constant determining unit 6d determines a spring constant k from the resonance frequency f 'detected by the resonance frequency detecting unit 11d, and outputs spring constant information Dk indicating the spring constant k. Specifically, the spring constant determining unit 6d multiplies the resonance frequency f 'by twice the pi, squares the multiplication result, and further multiplies the result by the mass m of the mover, thereby obtaining the spring constant k. (= (F ′ · 2π) ² · m).

  The operation of determining the spring constant k by the spring constant determining unit 6d is desirably performed when the linear vibration motor 100 has no spring-like load. That is, when the load has a spring-like element, the spring constant of the linear vibration motor and the spring constant of the load-like spring element are combined to calculate the spring constant. Cannot be calculated. Therefore, here, the operation in the calculation mode for calculating the spring constant is performed in a no-load state.

Next, the operation will be described.
In the motor driving device 101d of the fourth embodiment, when a command signal for instructing the operation start of the linear vibration motor is input to the control unit by a user operation, each unit 1d, 2a, 6d, 9d of the motor driving device 101d. , 10d, and 11d are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101d temporarily becomes the calculation mode, and then becomes the operation mode.

First, the operation in the calculation mode for determining the spring constant k of the spring member of the linear vibration motor 100 will be described.
The motor driver 1d drives the linear vibration motor 100 by supplying a driving voltage or a driving current to the linear vibration motor 100 based on a control signal from a control unit (not shown). At this time, the voltage detection unit 10d detects the drive voltage Vdr based on the sensor output Vsns from the voltage sensor 10d1, and outputs a voltage detection signal Vd. Further, the current detection unit 9d detects a drive current Cdr supplied from the motor driver 1d to the linear vibration motor 100, and outputs a current detection signal Cd.

  The resonance frequency detector 11d outputs a drive frequency control signal Sfc to the motor driver 1d based on the output signal Vd of the voltage detector 10d and the output signal Cd of the current detector 9d. Then, the motor driver 1d adjusts the frequency of the drive voltage Vdr applied to the linear vibration motor 100 so that the drive frequency of the linear vibration motor 100 becomes the frequency at which the power supplied to the linear vibration motor 100 is maximized. And the resonance frequency f ′, which is the frequency at which the power supplied to the linear vibration motor is maximized.

The spring constant determining unit 6d multiplies the resonance frequency f 'by twice the pi based on the frequency information Drf indicating the resonance frequency f' detected by the resonance frequency detection unit 11d, and squares the multiplication result. Then, an operation of multiplying the square of the multiplication result by the mass of the mover is performed to calculate a spring constant k and output spring constant information Dk indicating the spring constant.
After that, the operation mode of the motor driving device 101d switches from the calculation mode to the operation mode.

Hereinafter, the operation in the operation mode will be described.
The motor driver 1d applies an AC voltage (drive voltage) Vdr to the linear vibration motor 100 under the control of a control unit (not shown). Thus, the linear vibration motor 100 is driven.
At this time, the mover position calculating unit 2a calculates the position of the mover based on the drive current Cdr and the drive voltage Vdr applied to the linear vibration motor 100 by the spring constant determining unit 6d. This is performed using the spring constant k, and the position information Dpc indicating the calculated mover position is output to the motor driver 1d.

  Then, the motor driver 1d controls the voltage level of the drive voltage Vdr applied to the linear vibration motor 100 based on the position information Dpc so that the reciprocating movable element does not exceed the limit position.

  As described above, in the fourth embodiment, in the motor drive device 101d that drives the linear vibration motor 100, the current detection unit 9d that detects the drive current Cdr of the linear vibration motor 100, and the drive voltage Vdr of the linear vibration motor 100 A voltage detecting unit 10d for detecting, and a resonance frequency detecting unit 11d for controlling the motor driver 1d based on the detected driving current Cdr and the driving voltage Vdr to detect a resonance frequency f ′ of the linear vibration motor 100 are provided. Since the spring constant k of the spring member is determined from the detected resonance frequency f ′, the position of the mover can be calculated with high accuracy by the position calculation using the spring constant k. As in the first embodiment, there is an effect that the size and output of the linear vibration motor can be reduced.

  Further, in the fourth embodiment, the spring constant k of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100, as in the first embodiment. However, there is also an effect that the position calculation can accurately calculate the position of the mover.

  In the fourth embodiment, the motor driving device 101d calculates the spring constant k of the linear vibration motor immediately before the operation of the linear vibration motor 100 starts. The spring constant of the linear vibration motor may be calculated immediately after the end of the operation.

  In this case, during the operation of the linear vibration motor, the position calculation for calculating the position of the mover is performed using the spring constant k calculated immediately after the previous operation of the linear vibration motor. Therefore, also in this case, the position calculation for calculating the position of the mover using the spring constant k in the state of the latest linear vibration motor is always performed. There is an effect that the position of the mover can be accurately calculated by the calculation.

  In this case, since the calculation of the spring constant k is performed immediately after the operation of the linear vibration motor is completed, the spring constant k is calculated in a state where the motor temperature is substantially equal to the temperature during the operation of the actual linear vibration motor. Will be done. That is, although the spring constant k changes depending on the temperature, by calculating the spring constant k based on the temperature at which the motor actually operates, it is possible to obtain an accurate spring constant k during operation of the linear vibration motor, There is an effect that the position calculation for calculating the position of the mover can be performed with higher accuracy.

  Furthermore, in the above case, since the calculation of the spring constant k is performed after the operation of the linear vibration motor is completed, the spring constant k can be calculated without hindering the operation of the linear vibration motor.

  In the fourth embodiment, the resonance frequency detecting unit 11d adjusts the drive frequency of the linear vibration motor to a value supplied to the linear vibration motor while keeping the amplitude of the drive current supplied to the linear vibration motor 100 constant. The motor driver 1d is controlled so that the power becomes the maximum frequency, and the resonance frequency f ′ of the linear vibration motor is detected from the drive frequency at which the supplied power is maximum. Alternatively, the resonance frequency may be detected from the phase difference between the drive current and the drive voltage in the resonance state of the linear vibration motor.

  In brief, the phase difference between the drive current and the drive voltage is not always fixed, but is uniquely determined from the amplitude value, drive frequency, and induced voltage value (amplitude value and effective value of induced voltage) of the drive current. It is.

  Therefore, the resonance frequency detection unit 11d sets the motor so that the phase difference between the drive voltage and the drive current becomes a phase difference in a resonance state uniquely determined from the amplitude value, the drive frequency, and the induced voltage value of the drive current. The frequency of the drive voltage from the driver 1d may be controlled, and the frequency of the drive voltage when the phase difference between the drive voltage and the drive current becomes the phase difference in the resonance state may be determined as the resonance frequency.

  In the fourth embodiment, the motor driving device 101d has two operation modes, an operation mode and a calculation mode. In the operation mode, the linear vibration motor 100 is driven by a driving voltage corresponding to a required motor output. In the operation mode, the resonance frequency of the linear vibration motor 100 is detected, and the spring constant is obtained based on the resonance frequency. It has only an operation mode (operation mode) for driving the load of the motor. In this operation mode, the resonance frequency of the linear vibration motor is detected, and the linear vibration motor is driven at the resonance frequency. The spring constant k may be determined based on the frequency.

(Embodiment 5)
FIG. 5 is a block diagram illustrating a motor driving device according to a fifth embodiment of the present invention.
The motor driving device 101e according to the fifth embodiment has two operation modes for operating the linear vibration motor. One operation mode is an operation mode in which the linear vibration motor 100 is driven by a driving voltage or a driving current according to the motor output to drive the load of the linear vibration motor. The other operation mode is a calculation mode in which a spring constant k of a spring member of the linear vibration motor 100 is calculated, and a relation (spring constant temperature function) Qa between the spring constant k and the motor temperature T is derived. Here, in the operation mode, the motor drive device 101e estimates the spring constant of the linear vibration motor in the operation mode by the spring constant temperature function Qa based on the motor temperature Tm, and determines the estimated spring constant k (t ) Is used to calculate the position of the mover, and the drive of the linear vibration motor 100 is controlled according to the calculated position of the mover.

The linear vibration motor 100 is the same as that of the first embodiment.
That is, the motor driving device 101e according to the fifth embodiment calculates the motor driver 1a that drives and controls the linear vibration motor 100 based on the position information Dpc indicating the position Px of the mover, and calculates the position Px of the mover. And a mover position calculator 2e for performing the position calculation based on the spring constant k (t) estimated in the operation mode of the linear vibration motor 100.

  Here, the motor driver 1a is the same as that of the first embodiment. Further, the mover position calculating section 2e calculates the position Px of the mover when the linear vibration motor 100 performs the reciprocating operation by the position calculation, similarly to the mover position calculating section 2a of the first embodiment. The specific position calculation is to calculate the position Px of the mover from the equation of motion of the linear vibration motor 100 as described in the first embodiment or the related art. However, in the mover position calculation unit 2e of the fifth embodiment, the position calculation uses an estimated spring constant k (t) estimated from the motor temperature Tm as the spring constant.

  The motor driving device 101e applies a forced vibration force Ffv to the mover of the linear vibration motor 100 to freely vibrate the mover, and the mover forced vibration section 3a that freely vibrates the mover of the linear vibration motor 100. A relative position detector 4a that detects a timing at which the mover has passed a certain relative position with respect to a reference position such as the center of vibration of the mover, and outputs timing information Dpr indicating the detected timing; A natural vibration frequency detecting section 5a for detecting a natural vibration frequency fpv of the spring vibration system based on the timing information Dpr. Here, the mover forced vibration section 3a, relative position detection section 4a, and natural vibration frequency detection section 5a are the same as those in the first embodiment.

  The motor driving device 101e determines a spring constant k of a spring member from the detected natural vibration frequency fpv, and outputs a spring constant information Dk indicating the spring constant. A temperature detector 12e for detecting the motor temperature Tm and outputting temperature information Dtm indicating the detected motor temperature Tm; and a spring constant of a spring member of the linear vibration motor during operation based on the spring constant information Dk and the temperature information Dtm. And a spring constant estimating unit 13e for estimating.

  Here, the temperature detection unit 12e is attached to the linear vibration motor 100, and includes a temperature sensor that monitors the motor temperature Tm. The spring constant determining unit 6a is the same as that in the first embodiment. Specifically, the natural vibration frequency fpv detected by the natural vibration frequency detecting unit 5a is set to twice the pi. Multiplying the result of the multiplication, squaring the result of the multiplication, and further multiplying the square of the result of the multiplication by the mass of the mover to determine the spring constant k and outputting spring constant information Dk indicating the spring constant k It is. In the calculation mode, the spring constant estimating unit 13e derives a spring constant temperature function Qa indicating a relationship between the spring constant k and the motor temperature Tm based on the spring constant information Dk and the temperature information Dtm. In the mode, the spring constant of the linear vibration motor during load operation is estimated from the detected motor temperature Tm using the spring constant temperature function Qa, and the spring constant (estimated spring constant) k ( It outputs estimated spring constant information Dk (t) indicating t). Here, the spring constant estimating unit 13e derives the spring constant temperature function Qa based on the temperature coefficient αk of the spring member indicating the ratio of the change in the spring constant to the change in temperature. That is, the spring constant estimating unit 13e holds the temperature coefficient αk corresponding to the spring member in its internal memory, and determines the spring constant k of the spring member determined by the spring constant determining unit 6a in the calculation mode and the spring constant k in the calculation mode. From the motor temperature Tm detected by the temperature detector 12e and the temperature coefficient αk of the spring member held in the internal memory, the spring constant temperature which is a linear function indicating the correspondence between the spring constant k and the motor temperature Tm. The function Qa is derived.

  The spring constant temperature function Qa is not limited to a linear function indicating the correspondence between the spring constant k and the motor temperature Tm, but is a two-dimensional matrix indicating the correspondence between the spring constant k and the motor temperature Tm. There may be.

  Thus, in the operation mode, the motor driving device 101e according to the fifth embodiment estimates the spring constant k (t) of the linear vibration motor from the motor temperature Tm, and determines the position of the mover from the estimated spring constant k (t). Is calculated, and the driving of the linear vibration motor is controlled in accordance with the calculated position of the mover.

Next, the operation will be described.
In the motor driving device 101e of the fifth embodiment, when a command signal for instructing the start of operation of the linear vibration motor is input to the control unit by a user operation, each unit 1a, 2e, 3a, 4a of the motor driving device 101e. , 5a, 6a, 12e, and 13e are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101e temporarily becomes the calculation mode, and then becomes the operation mode.

First, the operation in the calculation mode for determining the spring constant k of the spring member of the linear vibration motor 100 will be described.
The mover forced vibration unit 3a applies a forced vibration force Ffv to the mover of the linear vibration motor 100 based on a control signal from a control unit (not shown) in the operation mode, that is, in a non-operation state of the linear vibration motor 100. The mover is vibrated freely by applying a voltage temporarily.

The relative position detection unit 4a detects the timing at which the freely vibrating mover passes through a fixed point (relative position) and outputs timing information Dpr indicating the detected timing.
The natural vibration frequency detector 5a detects the natural vibration frequency f of the spring vibration system based on the timing information Dpr from the relative position detector 4a. Specifically, the natural vibration frequency detection unit 5a detects how many times the movable element that freely oscillates has passed a certain fixed point (generally, the vibration center point of the movable element) in a fixed time, and The frequency information Df indicating the vibration frequency f is output.

Using the natural vibration frequency f detected by the natural vibration frequency detection unit 5a, the spring constant determining unit 6a multiplies the natural vibration frequency f by twice the pi, squares the result of the multiplication, and furthermore, A spring constant k is calculated by an operation of multiplying the square of the multiplication result by the mass of the mover, and spring constant information Dk indicating the spring constant is output to the spring constant estimating unit 13e.
At this time, the temperature detector 12e detects the motor temperature Tm of the linear vibration motor 100 and outputs temperature information Dtm indicating the motor temperature to the spring constant estimator 13e.

Then, the spring constant estimating unit 13e determines the relationship between the spring constant k and the motor temperature Tm based on the temperature coefficient αk of the spring member held in the internal memory and the spring constant information Dk and the temperature information Dtm. Is derived, and data of the function Qa is stored in an internal memory.
Thereafter, the operation mode of the motor driving device 101e is switched from the calculation mode to the operation mode.

Hereinafter, the operation in the operation mode will be described.
When the motor driver 1a applies an AC voltage (drive voltage) Vdr to the linear vibration motor 100, the linear vibration motor 100 is driven, and the operation of the load connected to the linear vibration motor is started.

  At this time, temperature information Dtm indicating the motor temperature Tm detected by the temperature detecting unit 12e is input to the spring constant estimating unit 13e, and the spring constant estimating unit 13e receives the detected motor temperature Tm. From the spring constant temperature function Qa based on the above, the spring constant in the operating state of the linear vibration motor is estimated, and the estimated spring constant information Dk (t) indicating the estimated spring constant k (t) is calculated by the mover position calculation. Output to the unit 2e.

  Then, the estimated spring constant information Dk (t) indicates the position calculation for calculating the position of the mover based on the drive current Cdr and the drive voltage Vdr applied to the motor driver 1a. The position information Dpc indicating the calculated mover position Px is output to the motor driver 1a by using the estimated spring constant k (t).

  Then, based on the position information Dpc, the motor driver 1a controls the level of the drive voltage Vdr applied to the linear vibration motor 100 so that the reciprocating movable element does not exceed the limit position.

  As described above, in the fifth embodiment, in the motor driving device 101e that drives the linear vibration motor 100, the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100 and the free vibration state of the mover A natural vibration frequency detecting section 5a for detecting a natural vibration frequency f of the movable element based on the natural vibration frequency, a spring constant determining section 6a for determining a spring constant k based on the natural vibration frequency f, and a temperature detection for detecting a temperature of the linear vibration motor. In the operation mode, a relation Qa between the spring constant k and the motor temperature Tm is calculated based on the temperature coefficient αk of the spring constant, the detected motor temperature Tm, and the determined spring constant k. In the operation mode, the spring constant k (t) in the load operation state is estimated from the motor temperature Tm detected in the operation state using the spring constant temperature function Qa. Therefore, in the operation state of the motor, the position calculation for calculating the position of the mover is performed using the estimated spring constant k (t) corresponding to the motor temperature Tm. The position of the child can be calculated with higher accuracy.

  This makes it possible to more accurately control the position of the mover during motor operation, and to further reduce the clearance between the mover and the linear vibration motor housing to further reduce the size and output of the linear vibration motor. There is an effect that can be achieved.

  In the fifth embodiment, the spring constant of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. There is also an effect that the position of the mover can be accurately calculated by the position calculation for calculating the position of the child.

  In the fifth embodiment, the motor driving device 101e calculates the spring constant k of the linear vibration motor 100 and detects the motor temperature Tm immediately before the operation of the linear vibration motor 100, and performs the spring constant temperature function Qa. In operation, the spring constant k (t) is estimated from the motor temperature Tm using the spring constant temperature function Qa derived immediately before the start of operation. Immediately after the end of the operation, the spring constant k of the linear vibration motor 100 is calculated and the motor temperature Tm is detected to derive a spring constant temperature function Qa. At the time of operation, the spring constant temperature function Qa derived at the end of the previous operation is used. The spring constant k (t) may be estimated from the motor temperature Tm.

  Further, the motor driving device 101e calculates the spring constant k of the linear vibration motor 100 and detects the motor temperature Tm immediately before and immediately after the operation of the linear vibration motor 100 to derive a spring constant temperature function Qa. It may be.

  In this case, the calculation for obtaining the position of the mover in the operation mode is performed based on the spring constant obtained from the spring constant temperature function Qa derived immediately before the start of the current operation and the spring constant temperature function Qa derived immediately after the previous operation. It is desirable to use an average value with the given spring constant.

  Further, in the fifth embodiment, the spring constant estimating unit 13e derives the spring constant temperature function Qa using the temperature coefficient αk of the spring member stored in its internal memory in advance. The method for deriving the function Qa is not limited to the method using the temperature coefficient αk of the spring member.

  For example, the spring constant estimating unit 13e calculates the spring constant k of the linear vibration motor 100 and detects the motor temperature Tm immediately before the start of the operation of the linear vibration motor 100. Calculation of the spring constant k of the vibration motor 100 and detection of the motor temperature Tm are performed to derive a spring constant temperature function Qa from spring constants at different motor temperatures, and at the next operation, the derived spring constant temperature function Qa May be used to estimate the spring constant from the motor temperature.

  Further, the spring constant estimating unit 13e may update the spring constant temperature function every time the spring constant is calculated under a new temperature condition.

  Further, in the fifth embodiment, the motor drive device 101e determines the spring constant k based on the natural vibration frequency f, as in the first embodiment. Thus, the spring constant k may be determined based on the natural angular frequency ω, or the spring constant k may be determined based on the natural vibration period T as in the third embodiment. As in the fourth embodiment, the motor driving device 101e may determine the spring constant k based on the detected driving voltage and the resonance frequency obtained from the driving current.

(Embodiment 6)
FIG. 6 is a block diagram illustrating a motor driving device according to a sixth embodiment of the present invention.
The motor drive device 101f according to the sixth embodiment drives and controls the linear vibration motor 100 according to the position of the mover, similarly to the motor drive device 101a according to the first embodiment. The only difference is that the position calculation for obtaining the position of the mover is performed using the mass spring ratio rmk of the spring vibration system, which is the value of the ratio between the mass of the mover and the spring constant of the spring member.

  That is, the motor driving device 101f according to the sixth embodiment replaces the spring constant determination unit 6a of the motor driving device 101a according to the first embodiment with the mass spring of the spring vibration system based on the natural vibration frequency f of the mover. An operation for obtaining the position of the mover based on the determined mass spring ratio rmk in place of the mass spring ratio determining unit 14f that determines the ratio rmk and the mover position operation unit 2a of the motor driving device 101a according to the first embodiment. And a mover position calculation unit 2f that performs the above operation.

Hereinafter, the motor driver 1a, the mover position calculation unit 2f, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration frequency detection unit 5a, and the mass spring ratio determination unit 14f that constitute the motor drive device 101f will be described in detail. explain.
Here, the motor driver 1a, the mover forced vibration unit 3a, the relative position detection unit 4a, and the natural vibration frequency detection unit 5a are the same as those in the motor drive device 101a of the first embodiment.

  The mass spring ratio determining unit 14f determines a mass spring ratio rmk from the natural vibration frequency f of the mover detected by the natural vibration frequency detecting unit 5a, and outputs mass spring ratio information Drmk indicating the determined mass spring ratio rmk. To do. Here, a specific operation for determining the mass spring ratio rmk is to multiply the natural vibration frequency f by twice the pi, square the multiplication result, and take the reciprocal of the value obtained by squaring the multiplication result. Things.

  The mover position calculator 2f calculates the position Px of the mover when the mover of the linear vibration motor 100 is performing a reciprocating operation, similarly to the mover position calculator 2a of the first embodiment. The mover position calculator 2f of the sixth embodiment uses the mass spring ratio determined by the mass spring ratio determiner 14f to calculate the position of the mover. The difference from the mover position calculation unit 2a of the first embodiment is that (m / k) is used.

Next, the operation will be described.
In the motor driving device 101f according to the sixth embodiment, when a command signal for instructing operation start of the linear vibration motor is input to the control unit by a user operation, each unit of the motor driving device 101f is similar to the first embodiment. 1a, 2f, 3a, 4a, 5a, and 14f are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101f temporarily becomes an operation mode and then becomes an operation mode. Is done.

First, the operation of the linear vibration motor 100 in the calculation mode for determining the mass spring ratio rmk of the spring vibration system will be described.
In the motor driving device 101f according to the sixth embodiment, the mover forced vibration unit 3a, the relative position detection unit 4a, and the natural vibration frequency detection unit 5a operate in the same manner as the motor driving device 101a according to the first embodiment.

In the sixth embodiment, based on the frequency information Df from the natural vibration frequency detecting unit 5a, the mass spring ratio determining unit 14f assigns twice the pi to the natural vibration frequency f indicated by the frequency information Df. Multiplication, squaring the multiplication result, and calculating the reciprocal of a value obtained by squaring the multiplication result, to calculate a mass spring ratio rmk (= 1 / (f · 2π) ² = m / k) The mass spring ratio information Dmk indicating the mass spring ratio rmk is output.

After that, the operation mode of the motor driving device 101f switches from the calculation mode to the operation mode.
In the operation mode of the motor driving device 101f according to the sixth embodiment, as in the first embodiment, the motor driver 1a applies an AC voltage (drive voltage) Vdr to the linear vibration motor 100 to drive the linear vibration motor 100.

  At this time, the mover position calculation unit 2f performs a position calculation for calculating the position of the mover based on the drive current Cdr and the drive voltage Vdr of the motor driver 1a, using the mass spring ratio determined by the mass spring ratio determination unit 14f. The position information Dpc indicating the calculated mover position Px is output to the motor driver 1a.

  Then, based on the position information Dpc, the motor driver 1a controls the level of the drive voltage Vdr applied to the linear vibration motor 100 so that the reciprocating movable element does not exceed the limit position.

  As described above, in the sixth embodiment, in the motor driving device 101f that drives the linear vibration motor 100, there are the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100, and the above-described movable element that freely vibrates. A relative position detecting section 4a for detecting a timing of passing through a fixed point (relative position); and a natural vibration frequency detecting section 5a for detecting a natural vibration frequency f of the mover based on the timing information Dpr of the detecting section. Since the mass spring ratio rmk of the spring vibration system is determined from the detected natural vibration frequency f, the position of the mover obtained by the position calculation using the mass spring ratio rmk of the spring vibration system can be made highly accurate. As in the first embodiment, there is an effect that the size and output of the linear vibration motor can be reduced.

  In the sixth embodiment, as in the first embodiment, the mass spring ratio rmk of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. The calculation to calculate the position Px of the mover using the mass spring ratio rmk in the state is performed. Therefore, even if the mass spring ratio changes over time, the position of the mover is changed to the mass spring ratio. There is also an effect that the calculation using rmk can be performed with high accuracy.

  In the sixth embodiment, the motor driving device 101f calculates the mass spring ratio rmk of the spring vibration system of the linear vibration motor immediately before the operation of the linear vibration motor 100 starts. Alternatively, immediately after the operation of the linear vibration motor 100 ends, the mass spring ratio rmk of the spring vibration system of the linear vibration motor may be calculated.

  In this case, when the linear vibration motor is operated, the position calculation for calculating the position of the mover is performed using the mass spring ratio rmk calculated immediately after the previous operation of the linear vibration motor. Therefore, also in this case, the position calculation for calculating the position of the mover is always performed using the mass spring ratio rmk in the state of the latest linear vibration motor, and the mass spring of the spring member of the linear vibration motor is over time. Even if the ratio changes, there is an effect that the position calculation can accurately calculate the position of the mover.

  In this case, since the mass spring ratio is calculated immediately after the operation of the linear vibration motor is completed, the mass spring ratio is calculated in a state where the motor temperature is substantially equal to the temperature at the time of operation of the actual linear vibration motor. Will be done. In other words, the mass spring ratio changes depending on the temperature, but by calculating the mass spring ratio based on the temperature at which the motor actually operates, it is possible to obtain an accurate mass spring ratio during operation of the linear vibration motor, There is an effect that the position calculation for calculating the position of the mover can be performed with higher accuracy.

  Further, in the above case, since the calculation of the mass spring ratio is performed after the operation of the linear vibration motor is completed, there is an effect that the mass spring ratio can be calculated without hindering the operation of the linear vibration motor.

(Embodiment 7)
FIG. 7 is a block diagram illustrating a motor driving device according to a seventh embodiment of the present invention.
The motor drive device 101g according to the seventh embodiment controls the drive of the linear vibration motor 100 according to the position of the mover, similarly to the motor drive device 101b according to the second embodiment. The only difference is that the position calculation for calculating the position of the mover is performed using the mass spring ratio rmk of the spring vibration system of the linear vibration motor.

  That is, the motor driving device 101g according to the seventh embodiment uses the spring vibration based on the natural angular frequency (angular velocity) ω of the mover instead of the spring constant determining unit 6b of the motor driving device 101b according to the second embodiment. The mass spring ratio determination unit 14g that determines the mass spring ratio rmk of the system and the mover position calculation unit 2a of the motor driving device 101b according to the second embodiment, which replaces the mover position calculation unit 2a. And a mover position calculator 2g for performing a calculation for obtaining the position.

  Hereinafter, the motor driver 1a, the mover position calculation unit 2g, the mover forced vibration unit 3a, the relative position detection unit 4b, the natural angular frequency detection unit 5b, and the mass spring ratio determination unit 14g that constitute the motor drive device 101g will be described. explain in detail.

  Here, the motor driver 1a, the mover forced vibration unit 3a, the relative position detection unit 4b, and the natural angular frequency detection unit 5b are the same as those in the motor drive device 101b of the second embodiment. The mover position calculator 2g is the same as the mover position calculator 2f of the motor driving device 101f according to the sixth embodiment.

The mass spring ratio determining unit 14g determines a mass spring ratio rmk from the natural angular frequency ω detected by the natural angular frequency detecting unit 5b, and outputs mass spring ratio information Dmk indicating the determined mass spring ratio rmk. Things. The calculation for obtaining the mass spring ratio rmk (= 1 / ω ² ) by the mass spring ratio determining unit 14g is, specifically, squaring the natural angular frequency ω and taking the reciprocal of the multiplication result.

Next, the operation will be described.
In the motor driving device 101g of the seventh embodiment, when a command signal for instructing the start of the operation of the linear vibration motor is input to the control unit by a user operation, each unit of the motor driving device 101g is similar to the second embodiment. 1a, 2g, 3a, 4b, 5b, and 14g are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101g temporarily becomes an arithmetic mode and then becomes an operation mode. Is done.

First, the operation of the linear vibration motor 100 in the calculation mode for determining the mass spring ratio rmk will be described.
In the motor driving device 101g according to the seventh embodiment, the mover forced vibration unit 3a, the relative position detection unit 4b, and the natural angular frequency detection unit 5b operate in the same manner as the motor driving device 101b according to the second embodiment.

In the seventh embodiment, the mass spring ratio determining unit 14g squares the natural angular frequency ω indicated by the frequency information Dω based on the frequency information Dω from the natural angular frequency detecting unit 5b, A mass spring ratio rmk (= 1 / ω ² ) is calculated by an operation that takes the reciprocal of the multiplication result, and mass spring ratio information Dmk indicating the mass spring ratio rmk is output.

Thereafter, the operation mode of the motor driving device 101g is switched from the calculation mode to the operation mode.
The motor drive device 101g according to the seventh embodiment operates in the operation mode in the same manner as the second embodiment.

  As described above, in the seventh embodiment, in the motor driving device 101g that drives the linear vibration motor 100, the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100, and the mover that freely vibrates are two. A relative position detector 4b for detecting the timing of passing through the fixed point (relative position), and a natural angular vibration for detecting the natural angular frequency ω of the mover based on the timing information Dpr from the relative position detector 4b. And the number detection unit 5b, and determines the mass spring ratio rmk of the spring vibration system from the detected natural angular frequency ω. Therefore, the position Px of the mover obtained by the position calculation using the mass spring ratio rmk is determined. As in the sixth embodiment, there is an effect that the size and output of the linear vibration motor can be reduced.

  In the seventh embodiment, similarly to the sixth embodiment, the mass spring ratio rmk of the spring vibration system of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. Even if the mass spring ratio rmk changes, the position of the mover can be calculated with high accuracy by calculation using the mass spring ratio rmk.

  In the seventh embodiment, the motor driving device 101g calculates the mass spring ratio rmk of the spring vibration system of the linear vibration motor immediately before the operation of the linear vibration motor 100 starts. May calculate the mass spring ratio rmk of the spring vibration system immediately after the operation of the linear vibration motor 100 ends.

(Embodiment 8)
FIG. 8 is a block diagram illustrating a motor driving device according to an eighth embodiment of the present invention.
The motor drive device 101h according to the eighth embodiment controls the drive of the linear vibration motor 100 according to the position of the mover, similarly to the motor drive device 101c according to the third embodiment. The only difference is that the position calculation for calculating the position of the mover is performed using the mass spring ratio rmk of the spring vibration system of the linear vibration motor.

  That is, the motor driving device 101h according to the eighth embodiment uses the spring based on the natural vibration period T of the mover (spring vibration system) instead of the spring constant determination unit 6c of the motor driving device 101c according to the third embodiment. The mass spring ratio determining unit 14h that determines the mass spring ratio rmk of the vibration system, and the mover based on the determined mass spring ratio rmk, which replaces the mover position calculation unit 2a of the motor driving device 101c according to the third embodiment. And a mover position calculator 2h for performing a position calculation for obtaining the position Px of the movable element.

  Hereinafter, the motor driver 1a, the mover position calculation unit 2h, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration period detection unit 5c, and the mass spring ratio determination unit 14h that constitute the motor drive device 101h will be described in detail. explain.

  Here, the motor driver 1a, the mover forced vibration part 3a, the relative position detection part 4a, and the natural vibration period detection part 5c are the same as those in the motor drive device 101c of the third embodiment, and The child position calculator 2h is the same as the mover position calculator 2f of the motor driving device 101f according to the sixth embodiment.

The mass spring ratio determining unit 14h determines a mass spring ratio rmk from the natural vibration period T of the mover detected by the natural vibration period detecting unit 5c, and outputs mass spring ratio information Dmk indicating the determined mass spring ratio rmk. Is what you do. In the calculation for calculating the mass spring ratio rmk (= (T / 2π) ² ) by the mass spring ratio determining unit 14h, specifically, the natural vibration period T is divided by twice the circumference, and the result is squared. Is what you do.

Next, the operation will be described.
In the motor driving device 101h according to the eighth embodiment, when a command signal for instructing the start of the operation of the linear vibration motor is input to the control unit by a user operation, each unit of the motor driving device 101h is similar to the third embodiment. 1a, 2h, 3a, 4a, 5c, and 14h, based on a control signal from a control unit (not shown), when the operation of the linear vibration motor is started, the operation mode of the motor driving device 101h temporarily becomes the calculation mode. After that, the operation mode is controlled to be in the operation mode.

First, the operation in the calculation mode for determining the mass spring ratio rmk of the spring vibration system of the linear vibration motor 100 will be described.
In the motor driving device 101h according to the eighth embodiment, the mover forced vibration unit 3a, the relative position detection unit 4a, and the natural vibration period detection unit 5c operate in the same manner as the motor driving device 101c according to the third embodiment.

In the eighth embodiment, the spring constant determining unit 14h divides the natural vibration period T indicated by the periodic information Dt by twice the circumference based on the period information Dt from the natural vibration period detecting unit 5c. Then, the result is squared to calculate a mass spring ratio rmk (= (2π / T) ² ) and to output mass spring ratio information Dmk indicating the mass spring ratio rmk.

Thereafter, the operation mode of the motor driving device 101h is switched from the calculation mode to the operation mode.
The motor driving device 101h according to the eighth embodiment operates in the operation mode similarly to the third embodiment.

  As described above, in the eighth embodiment, in the motor driving device 101h that drives the linear vibration motor 100, there are the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100, and the mover that freely vibrates. A relative position detector 4a for detecting the timing of passing through the fixed point (relative position), and a natural vibration period detector 5c for detecting the natural vibration period T of the mover based on the timing information Dpr indicating the detection result. Since the mass spring ratio rmk is determined from the detected natural vibration period T, the position Px of the mover obtained by the position calculation using the mass spring ratio rmk can be made highly accurate. Similarly to the above, there is an effect that the size and output of the linear vibration motor can be reduced.

  In the eighth embodiment, as in the sixth embodiment, the mass spring ratio of the spring vibration system of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. Even if the spring ratio changes, the position of the mover can be calculated with high accuracy by the calculation using the mass spring ratio.

  In the eighth embodiment, the motor driving device 101h calculates the mass spring ratio of the spring vibration system of the linear vibration motor immediately before the driving of the linear vibration motor 100 is started. Alternatively, the mass spring ratio of the spring vibration system of the linear vibration motor may be calculated immediately after the operation of the linear vibration motor 100 ends.

(Embodiment 9)
FIG. 9 is a block diagram illustrating a motor driving device according to a ninth embodiment of the present invention.
The motor drive device 101i according to the ninth embodiment controls the drive of the linear vibration motor 100 according to the position of the mover, similarly to the motor drive device 101d according to the fourth embodiment. The only difference is that the position calculation for obtaining the position of the mover is performed using the mass spring ratio rmk of the spring vibration system of the linear vibration motor 100.

  That is, the motor driving device 101i according to the ninth embodiment is different from the motor driving device 101d according to the fourth embodiment in that the spring constant determining unit 6d is replaced with a spring vibration system based on a resonance frequency f ′ of a spring vibration system in a resonance state. Of the mover based on the determined mass spring ratio rmk, which replaces the mass spring ratio determiner 14i for determining the mass spring ratio rmk of the motor spring 101 and the mover position calculator 2a of the motor drive device 101d of the fourth embodiment. And a mover position calculator 2i for performing a calculation for obtaining

  Hereinafter, the motor driver 1d, the mover position calculation unit 2i, the current detection unit 9d, the voltage detection unit 10d, the resonance frequency detection unit 11d, and the mass spring ratio determination unit 14i that constitute the motor drive device 101i will be described in detail.

  Here, the motor driver 1d, the current detector 9d, the voltage detector 10d, and the resonance frequency detector 11d are the same as those in the motor driving device 101d of the fourth embodiment, and the mover position calculator 2i. Is the same as the mover position calculation unit 2f of the motor driving device 101f of the sixth embodiment.

The mass spring ratio determination unit 14i determines a mass spring ratio rmk from the resonance frequency f ′ detected by the resonance frequency detection unit 11d, and outputs mass spring ratio information Dmk indicating the determined mass spring ratio rmk. is there. Here, the calculation of the mass spring ratio (= 1 / (f ′ · 2π) ² ) by the mass spring ratio determining unit 14i is performed by multiplying the resonance frequency f ′ by twice the pi, and calculating the multiplication result. Square and then take the reciprocal of the value obtained by squaring the result of the multiplication.

Next, the operation will be described.
In the motor driving device 101i of the ninth embodiment, when a command signal for instructing the operation start of the linear vibration motor is input to the control unit by a user operation, each unit 1d, 2i, 9d, 10d of the motor driving device 101i. , 11d, and 14i are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101i temporarily changes to the operation mode and then to the operation mode.

First, the operation of the linear vibration motor 100 in the calculation mode for determining the mass spring ratio rmk will be described.
In the motor driving device 101i according to the ninth embodiment, the motor driver 1d, the current detecting unit 9d, the voltage detecting unit 10d, and the resonance frequency detecting unit 11d operate in the same manner as the motor driving device 101d according to the fourth embodiment.

  In the ninth embodiment, the mass-spring-ratio determining unit 14i sets the resonance frequency f ′ to twice the pi based on the frequency information Drf indicating the resonance frequency f ′ detected by the resonance frequency detection unit 11d. , The result of the multiplication is squared, and the operation of taking the reciprocal of the value obtained by squaring the result of the multiplication is performed to calculate the mass spring ratio rmk, and the mass spring ratio information Dmk indicating the mass spring ratio rmk Is output.

Thereafter, the operation mode of the motor driving device 101i is switched from the calculation mode to the operation mode.
The motor driving device 101i according to the ninth embodiment operates in the operation mode in the same manner as the fourth embodiment.

  As described above, in the ninth embodiment, in the motor driving device 101i that drives the linear vibration motor 100, the current detection unit 9d that detects the driving current Cdr of the linear vibration motor 100 and the driving voltage Vdr of the linear vibration motor 100 A voltage detecting unit 10d for detecting, and a resonance frequency detecting unit 11d for controlling the motor driver 1d based on the detected driving current Cdr and the driving voltage Vdr to detect a resonance frequency f ′ of the linear vibration motor 100 are provided. Since the mass spring ratio rmk of the spring vibration system is determined from the detected resonance frequency f ', the position Px of the mover obtained by the position calculation using the mass spring ratio rmk is accurately determined as in the sixth embodiment. Therefore, there is an effect that the size or the output of the linear vibration motor can be reduced.

  In the ninth embodiment, the mass spring ratio rmk of the spring vibration system of the linear vibration motor is calculated immediately before the start of the operation of the linear vibration motor 100. Therefore, the mass spring ratio rmk changes with time. However, there is also an effect that the position calculation can accurately calculate the position of the mover.

  In the ninth embodiment, the motor driving device 101i calculates the mass spring ratio rmk of the spring vibration system of the linear vibration motor immediately before the operation of the linear vibration motor 100 starts. Alternatively, the mass spring ratio rmk of the linear vibration motor may be calculated immediately after the operation of the linear vibration motor 100 ends.

  In this case, when the linear vibration motor is operated, the position calculation for calculating the position of the mover is performed using the mass spring ratio rmk calculated immediately after the previous operation of the linear vibration motor. Therefore, also in this case, the position calculation for calculating the position of the mover using the mass spring ratio rmk in the state of the latest linear vibration motor is always performed, and even if the mass spring ratio rmk changes over time. According to the position calculation, there is an effect that the position of the mover can be accurately calculated.

  In this case, since the calculation of the mass spring ratio rmk is performed immediately after the operation of the linear vibration motor is completed, the mass spring ratio rmk is set in a state where the motor temperature is substantially equal to the temperature at the time of operation of the actual linear vibration motor. Is calculated. In other words, the mass spring ratio rmk changes depending on the temperature, but by calculating the mass spring ratio rmk at the temperature at which the motor actually operates, it is necessary to obtain the accurate mass spring ratio rmk during the operation of the linear vibration motor. Therefore, the position calculation for calculating the position of the mover can be performed with higher accuracy.

  Further, in the above case, since the calculation of the mass spring ratio rmk is performed after the operation of the linear vibration motor is completed, there is an effect that the mass spring ratio rmk can be calculated without hindering the operation of the linear vibration motor.

  Further, in the ninth embodiment, the resonance frequency detecting unit 11d determines that the drive frequency of the linear vibration motor is not supplied to the linear vibration motor while the amplitude of the drive current supplied to the linear vibration motor 100 is kept constant. The motor driver 1d is controlled so that the power becomes the maximum frequency, and the resonance frequency f ′ of the linear vibration motor is detected from the drive frequency at which the supplied power is maximum. As in the fourth embodiment, the resonance frequency may be detected from the phase difference between the drive current and the drive voltage in the resonance state of the linear vibration motor.

  In the ninth embodiment, the motor driving device 101i has two operation modes, an operation mode and a calculation mode. In the operation mode, the linear vibration motor 100 is driven at a driving frequency corresponding to a required motor output. In the operation mode, the linear vibration motor 100 is driven at the resonance frequency in accordance with the drive frequency control signal Sfc from the resonance frequency detection unit 11d. As shown in the above, only the operation mode (operation mode) for driving the load of the linear vibration motor is provided. In this operation mode, the resonance frequency of the linear vibration motor is detected, and the linear vibration motor is driven at the resonance frequency. In addition, the mass spring ratio rmk may be determined based on the detected resonance frequency.

(Embodiment 10)
FIG. 10 is a block diagram illustrating a motor driving device according to a tenth embodiment of the present invention.
The motor drive device 101j of the tenth embodiment controls the drive of the linear vibration motor 100 according to the position of the mover, similarly to the motor drive device 101e of the fifth embodiment. Is different only in that the position calculation for calculating the position of the mover is performed using the mass spring ratio rmk of the spring vibration system.

  That is, the motor drive device 101j of the tenth embodiment is different from the motor drive device 101e of the fifth embodiment in that the spring constant determination unit 6a is replaced by a mass spring of the spring vibration system based on the natural vibration frequency f of the spring vibration system. Based on the determined mass spring ratio rmk and the motor temperature Tm in place of the mass spring ratio determining unit 14j that determines the ratio rmk and the spring constant estimating unit 13e of the motor driving device 101e according to the fifth embodiment, the movable state is determined. The mass spring ratio estimating unit 15j for estimating the mass spring ratio rmk (t) of the motor and the estimated mass spring ratio rmk (t) replacing the mover position calculating unit 2e of the motor driving device 101e according to the fifth embodiment. And a mover position calculator 2j for performing a calculation for obtaining the position Px of the mover based on

  In other words, in the calculation mode, the motor driving device 101j calculates the mass spring ratio rmk of the spring vibration system based on the natural vibration frequency f of the spring vibration system, and calculates the detected motor temperature Tm and the calculated mass. The mass spring ratio temperature function Qb is obtained from the spring ratio rmk, and in the operation mode, the mass spring ratio of the linear vibration motor being driven is estimated by the mass spring ratio temperature function Qb based on the motor temperature Tm. The position of the mover is calculated using the mass spring ratio rmk (t), and the drive of the linear vibration motor 100 is controlled according to the calculated position of the mover.

  Hereinafter, the motor driver 1a, the mover position calculation unit 2j, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration frequency detection unit 5a, the temperature detection unit 12e, and the mass spring ratio determination that constitute the motor driving device 101j will be described. The unit 14j and the mass spring ratio estimating unit 15j will be described in detail.

  Here, the motor driver 1a, the mover forced vibration unit 3a, the relative position detection unit 4a, the natural vibration frequency detection unit 5a, and the temperature detection unit 12e are the same as those in the motor drive device 101e of the fifth embodiment. It is.

  The mass spring ratio determining unit 14j determines a mass spring ratio rmk from the natural vibration frequency f detected by the natural vibration frequency detecting unit 5a, and outputs mass spring ratio information Dmk indicating the determined mass spring ratio rmk. It is. Here, a specific calculation for obtaining the mass spring ratio rmk is to multiply the natural vibration frequency f by twice the pi, square the multiplication result, and take the reciprocal of the value obtained by squaring the multiplication result. Things.

  In the calculation mode, the mass spring ratio estimating unit 15j derives a mass spring ratio temperature function Qb from the mass spring ratio rmk determined by the mass spring ratio determining unit 14j and the motor temperature Tm detected by the temperature detecting unit 12e. In the operation mode, the mass spring ratio when the linear vibration motor 100 is operating is estimated from the mass spring ratio temperature function Qb based on the detected motor temperature Tm, and the estimated mass spring ratio ( It outputs estimated mass spring ratio information Dmk (t) indicating an estimated mass spring ratio) rmk (t).

  Here, the mass spring ratio temperature function Qb may be a linear function indicating the relationship between the mass spring ratio rmk and the motor temperature Tm, or may be a two-dimensional matrix.

Next, the operation will be described.
In the motor driving device 101j of the tenth embodiment, when a command signal for instructing the start of operation of the linear vibration motor is input to the control unit by a user operation, each unit 1a, 2j, 3a, 4a of the motor driving device 101j. , 5a, 12e, 14j, and 15j are controlled based on a control signal from a control unit (not shown) so that the operation mode of the motor driving device 101j temporarily becomes the calculation mode, and then becomes the operation mode.

First, the operation in the calculation mode for determining the mass spring ratio rmk of the spring member of the linear vibration motor 100 will be described.
In the motor driving device 101j according to the tenth embodiment, the mover forced vibration unit 3a, the relative position detection unit 4a, and the natural vibration frequency detection unit 5a operate in the same manner as the motor driving device 101e according to the fifth embodiment.

In the tenth embodiment, the mass-spring-ratio determining unit 14j multiplies the natural vibration frequency f by twice the pi using the natural vibration frequency f detected by the natural vibration frequency detecting unit 5a. , Squaring the multiplication result and calculating the reciprocal of a value obtained by squaring the multiplication result to calculate a mass spring ratio rmk, and mass spring ratio information Dmk indicating the mass spring ratio rmk to mass spring ratio Output to the estimation unit 15j.
At this time, the temperature detector 12e detects the temperature (motor temperature) Tm of the linear vibration motor 100 and outputs temperature information Dtm indicating the detected temperature to the mass spring ratio estimator 15j.

Then, the mass spring ratio estimating unit 15j derives a mass spring ratio temperature function Qb indicating a relationship between the mass spring ratio rmk and the motor temperature Tm based on the mass spring ratio information Drmk and the temperature information Dtm, and The data of the specific temperature function Qb is held in the internal memory.
Thereafter, the operation mode of the motor driving device 101j switches from the calculation mode to the operation mode.

Hereinafter, the operation in the operation mode will be described.
The motor driver 1a drives the linear vibration motor 100 by applying an AC voltage (drive voltage) Vdr to the linear vibration motor 100.

  At this time, the temperature information Dtm indicating the motor temperature Tm detected by the temperature detecting unit 12e is input to the mass spring ratio estimating unit 15j, and the mass spring ratio estimating unit 15j The mass spring ratio in the operating state of the linear vibration motor is estimated from the mass spring ratio temperature function Qb based on the temperature Tm, and estimated mass spring ratio information Dmk (t) indicating the estimated mass spring ratio rmk (t). ) Is output to the mover position calculator 2j.

  Then, the mover position calculator 2j performs a position calculation for calculating the position of the mover based on the drive current Cdr and the drive voltage Vdr applied to the motor driver 1a, and calculates the position of the mover from the mass spring ratio estimator 14j. This is performed using the estimated mass spring ratio rmk (t) indicated by the spring ratio information Dmk (t), and the mover position information Dpc indicating the calculated mover position Px is output to the motor driver 1a.

  Then, the motor driver 1a controls the amplitude value (voltage level) of the drive voltage Vdr applied to the linear vibration motor 100 based on the mover position information Dpc so that the reciprocating mover does not exceed the limit position. I do.

  As described above, in the tenth embodiment, in the motor driving device 101j that drives the linear vibration motor 100, the mover forced vibration unit 3a that freely vibrates the mover of the linear vibration motor 100 and the free vibration state of the mover A natural vibration frequency detecting unit 5a for detecting a natural vibration frequency f of the movable element based on the natural vibration frequency, a mass spring ratio determining unit 14j for determining a mass spring ratio rmk based on the natural vibration frequency f, and detecting a temperature of the linear vibration motor. A temperature detection unit 12e, and in the calculation mode, based on the temperature coefficient αmk of the mass spring ratio, the detected motor temperature Tm, and the determined mass spring ratio rmk, the mass spring ratio rmk and the motor temperature In the operation mode, the mass spring ratio rmk (t) in the load operation state is detected in the operation state using the mass spring ratio temperature function Qb. Since it is estimated from the motor temperature Tm, in the operation state of the motor, the position calculation for calculating the position of the mover is performed using the estimated mass spring ratio rmk (t) corresponding to the motor temperature Tm. In the operation state described above, the position of the mover can be calculated with higher accuracy.

  This makes it possible to more accurately control the position of the mover during motor operation, and to further reduce the clearance between the mover and the linear vibration motor housing to further reduce the size and output of the linear vibration motor. There is an effect that can be achieved.

  In the tenth embodiment, the mass spring ratio rmk of the linear vibration motor is calculated immediately before the operation of the linear vibration motor 100 is started. However, there is an effect that the position of the mover can be accurately calculated by the position calculation for calculating the position of the mover.

  In the tenth embodiment, the motor driving device 101j calculates the mass spring ratio rmk of the linear vibration motor 100 and detects the motor temperature Tm immediately before the operation of the linear vibration motor 100, and performs the mass spring ratio temperature function. In operation, the mass spring ratio rmk (t) is estimated from the motor temperature Tm using the mass spring ratio temperature function Qb derived immediately before the start of operation. Immediately after the operation of the motor 100 is completed, the mass spring ratio rmk of the linear vibration motor 100 is calculated and the motor temperature Tm is detected to derive a mass spring ratio temperature function Qb. The mass spring ratio rmk (t) may be estimated from the motor temperature Tm using the temperature function Qb.

  Further, the motor driving device 101j calculates the mass spring ratio rmk of the linear vibration motor 100 and detects the motor temperature Tm immediately before the start and immediately after the operation of the linear vibration motor 100 to derive the mass spring ratio temperature function Qb. May be used.

  In this case, the calculation for obtaining the position of the mover in the operation mode includes the mass spring ratio obtained from the mass spring ratio temperature function Qb derived immediately before the start of the current operation, and the mass spring ratio temperature function derived immediately after the end of the previous operation. It is desirable to use an average value with the mass spring ratio obtained from Qb.

  Further, in the tenth embodiment, the mass spring ratio estimating unit 15j derives the mass spring ratio temperature function Qb using the temperature coefficient αmk of the mass spring ratio held in its internal memory. The method for deriving the spring ratio temperature function Qb is not limited to the method using the temperature coefficient αmk of the mass spring ratio.

For example, the mass spring ratio estimating unit 15j calculates the mass spring ratio rmk of the linear vibration motor 100 and detects the motor temperature Tm immediately before starting the operation of the linear vibration motor 100, and further, immediately after the operation of the linear vibration motor ends. By calculating the mass spring ratio rmk of the linear vibration motor 100 and detecting the motor temperature Tm, a mass spring ratio temperature function Qb is derived from the mass spring ratio at different motor temperatures, and the derived function is derived at the next operation. The mass spring ratio rmk (t) constant may be estimated from the motor temperature using the mass spring ratio temperature function Qb.
Further, the mass spring ratio estimating unit 15j may update the mass spring ratio temperature function every time the mass spring ratio rmk is calculated under a new temperature condition.

  In the tenth embodiment, the motor driving device 101j determines the mass spring ratio rmk based on the natural vibration frequency f, as in the sixth embodiment. , The mass spring ratio rmk is determined based on the natural angular frequency ω of the spring vibration system, or as in the eighth embodiment, the mass spring ratio rmk is determined based on the natural vibration period T of the spring vibration system. Alternatively, the motor driving device 101j determines the mass spring ratio rmk based on the detected driving voltage and the resonance frequency obtained from the driving current as in the ninth embodiment. It may be something.

  Further, the linear vibration motor and the motor driving device shown in each of the first to tenth embodiments are used as a power unit such as a compressor as described above. For example, the linear vibration motor is placed in a closed container. It is effective for equipment such as air conditioners and refrigerators that are housed and used in environments with rapid changes in temperature and pressure.The position of the mover of the linear vibration motor is calculated with high accuracy without using a position sensor. can do.

  Hereinafter, a compressor using the linear vibration motor and the motor driving device of the first embodiment, and an air conditioner, a refrigerator, a cryogenic refrigerator, and a water heater using the compressor will be described in detail.

(Embodiment 11)
FIG. 13 is a schematic diagram illustrating a compressor driving device according to Embodiment 11 of the present invention.
The compressor driving device 211 according to the eleventh embodiment drives the compressor 40 that compresses air, gas, and the like. Here, the power source of the compressor 40 is a linear vibration motor 46, which is the same as the linear vibration motor 100 of the first embodiment. Further, the compressor driving device 211 is a motor driving device that drives the linear vibration motor 46, and has the same configuration as the motor driving device 101a of the first embodiment. Hereinafter, the compressor 40 according to the eleventh embodiment is referred to as a linear compressor, and the linear compressor 40 will be briefly described.

  The linear compressor 40 has a cylinder part 41a arranged along a predetermined axis and a motor part 41b. A piston 42 slidably supported in the axial direction is disposed in the cylinder portion 41a. A piston rod 42a whose one end is fixed to the back side of the piston 42 is disposed over the cylinder portion 41a and the motor portion 41b, and the piston rod 42a is attached to the other end of the piston rod 42a in the axial direction. A biasing support spring 43 is provided. Here, the support spring 43 corresponds to the spring member of the linear vibration motor 100 described in the first embodiment.

  A magnet 44 is attached to the piston rod 42a, and an electromagnet 45 including an outer yoke 45a and a stator coil 45b embedded in the outer yoke 45a is provided at a portion of the motor portion 41b facing the magnet 44. Installed. In the linear compressor 40, a linear vibration motor 46 is configured by the electromagnet 45 and the magnet 44 attached to the piston rod 42a. Therefore, in the linear compressor 40, the piston 42 reciprocates along its axial direction by the electromagnetic force generated between the electromagnet 45 and the magnet 44 and the elastic force of the spring 43. Here, the piston 42, the piston rod 42a, and the magnet 44 correspond to the mover of the linear vibration motor 100 described in the first embodiment.

  Further, in the cylinder portion 41a, a compression chamber 48, which is a closed space surrounded by a cylinder upper inner surface 47a, a piston compression surface 42b, and a cylinder peripheral wall surface 47b, is formed. One end of a suction pipe 40a for sucking the low-pressure gas Lg into the compression chamber 48 is opened in the cylinder inner surface 47a. One end of a discharge pipe 40b for discharging the high-pressure gas Hg from the compression chamber 48 is opened in the cylinder upper inner surface 47a. A suction valve 49a and a discharge valve 49b for preventing backflow of gas are attached to the suction pipe 40a and the discharge pipe 40b.

  In the linear compressor 40 having such a configuration, the piston 42 reciprocates in the axial direction thereof by application of the drive voltage from the motor drive device 211 to the linear vibration motor 46, so that the low-pressure gas Lg is sucked into the compression chamber 48. The compression of the gas in the compression chamber 48 and the discharge of the compressed high-pressure gas Hg from the compression chamber 48 are repeatedly performed.

  In the linear compressor 40 according to the eleventh embodiment, the motor driving device 211 calculates the spring constant of the spring member in the calculation mode in which the linear vibration motor is in the non-operation state, similarly to the motor driving device 101a according to the first embodiment. However, in the operation mode in which the operation of the linear vibration motor is performed, the position of the mover of the linear vibration motor is calculated using the calculated spring constant. Can be detected. Thereby, the clearance between the piston and the cylinder head can be reduced, and the linear compressor can be downsized.

  In the eleventh embodiment, the motor driving device constituting the compressor 40 is the same as that of the first embodiment. However, the motor driving device of the compressor 40 is not limited to that of the first embodiment. Instead, any of Embodiments 2 to 10 may be used.

(Embodiment 12)
FIG. 14 is a block diagram illustrating an air conditioner according to Embodiment 12 of the present invention.
The air conditioner 212 according to the twelfth embodiment is an air conditioner that has an indoor unit 55 and an outdoor unit 56 and performs cooling and heating. The air conditioner 212 includes a linear compressor 50a that circulates a refrigerant between the indoor unit 55 and the outdoor unit 56, and a compressor driving device 50b that drives the linear compressor 50a. Here, the compressor 50a is the same as the linear compressor 40 having the linear vibration motor 46 of the eleventh embodiment. The compressor drive device 50b is a motor drive unit that applies a drive voltage Vd to the linear vibration motor of the linear compressor 50a, and has the same configuration as the motor drive device 211 of the eleventh embodiment.

  More specifically, the air conditioner 212 according to the twelfth embodiment includes a linear compressor 50a, a four-way valve 54, a restrictor (expansion valve) 53, an indoor heat exchanger 51, and an outdoor heat exchange that form a refrigerant circulation path. And a motor drive unit 50b for driving a linear vibration motor that is a drive source of the linear compressor 50a.

  Here, the indoor heat exchanger 51 constitutes the indoor unit 55, and the expansion device 53, the outdoor heat exchanger 52, the linear compressor 50a, the four-way valve 54, and the motor drive unit 50b constitute the outdoor unit 56. Make up.

  The indoor side heat exchanger 51 has a blower 51a for improving the heat exchange capacity, and a temperature sensor 51b for measuring the temperature of the heat exchanger 51 or its surrounding temperature. The outdoor heat exchanger 52 has a blower 52a for improving the heat exchange capacity, and a temperature sensor 52b for measuring the temperature of the heat exchanger 52 or its surrounding temperature.

  In the twelfth embodiment, a linear compressor 50a and a four-way valve 54 are arranged in a refrigerant path between the indoor heat exchanger 51 and the outdoor heat exchanger 52. That is, in the air conditioner 212, the refrigerant flows in the direction of arrow A, the refrigerant passing through the outdoor heat exchanger 52 is sucked into the linear compressor 50a, and the refrigerant discharged from the linear compressor 50a is cooled by the indoor heat exchanger. The state in which the refrigerant is supplied to the exchanger 51 and the refrigerant flows in the direction of arrow B, the refrigerant having passed through the indoor heat exchanger 51 is sucked into the linear compressor 50a, and the refrigerant discharged from the linear compressor 50a is discharged outside the outdoor. The state supplied to the heat exchanger 52 is switched by the four-way valve 54.

  Further, the expansion device 53 has both an expansion function for reducing the flow rate of the circulating refrigerant and an operation of a valve for automatically adjusting the flow rate of the refrigerant. That is, the throttle device 53 expands the liquid refrigerant by reducing the flow rate of the liquid refrigerant sent from the condenser to the evaporator while the refrigerant is circulating in the refrigerant circulation path, and is required for the evaporator. A certain amount of refrigerant is supplied without excess or shortage.

  The indoor heat exchanger 51 operates as a condenser in the heating operation, and operates as an evaporator in the cooling operation. The outdoor heat exchanger 52 operates as an evaporator in the heating operation and the condenser in the cooling operation. It works as. In the condenser, the high-temperature and high-pressure refrigerant gas flowing through the inside of the condenser loses heat by the supplied air and gradually liquefies, and becomes a high-pressure liquid refrigerant near the outlet of the condenser. This is equivalent to the refrigerant radiating heat to the atmosphere to liquefy. Further, the liquid refrigerant, which has become low-temperature and low-pressure by the expansion device 53, flows into the evaporator. When the room air is sent into the evaporator in this state, the liquid refrigerant takes a large amount of heat from the air and evaporates, and changes to a low-temperature and low-pressure gas refrigerant. The air deprived of a large amount of heat by the evaporator is released as cold air from the air outlet of the air conditioner.

  In the air conditioner 212, the motor drive unit 50b controls the linear compressor 50a based on the operating condition of the air conditioner, that is, the target temperature, the actual room temperature, and the outside temperature set for the air conditioner. Controls the output of the linear vibration motor.

Next, the operation will be described.
In the air conditioner 212 of the twelfth embodiment, when the drive voltage Vd is applied from the motor drive unit 50b to the linear compressor 50a, the refrigerant circulates in the refrigerant circulation path, and the heat exchanger 51 of the indoor unit 55 and Heat exchange is performed in the heat exchanger 52 of the outdoor unit 56. That is, in the air conditioner 212, a known heat pump cycle is formed in the circulation circuit of the refrigerant by circulating the refrigerant sealed in the circulation circuit of the refrigerant by the linear compressor 50a. Thereby, heating or cooling of the room is performed.

  For example, when performing the heating operation of the air conditioner 212, the four-way valve 54 is set by a user's operation so that the refrigerant flows in the direction indicated by the arrow A. In this case, the indoor heat exchanger 51 operates as a condenser, and emits heat by circulating the refrigerant in the refrigerant circulation path. This warms the room.

  Conversely, when performing the cooling operation of the air conditioner 212, the four-way valve 54 is set by the user's operation so that the refrigerant flows in the direction indicated by the arrow B. In this case, the indoor heat exchanger 51 operates as an evaporator, and absorbs the heat of the surrounding air by circulating the refrigerant in the refrigerant circulation path. Thereby, the room is cooled.

  Here, in the air conditioner 212, the output of the linear vibration motor of the linear compressor 50a is controlled by the motor drive unit 50b based on the target temperature, the actual room temperature, and the outside temperature set for the air conditioner. You. Thereby, in the air conditioner 212, comfortable cooling and heating are performed.

  As described above, in the air conditioner 212 of the twelfth embodiment, the compressor (linear compressor) 50a that uses a linear vibration motor as a power source is used as the compressor that compresses and circulates the refrigerant. Compared to an air conditioner using a compressor powered by a type motor, friction loss in the compressor is reduced, and the sealing performance of the compressor, which seals high-pressure refrigerant and low-pressure refrigerant, is enhanced. Thus, the efficiency of the compressor can be improved.

  Furthermore, in the compressor 50a using the linear vibration motor according to the twelfth embodiment, since the friction loss is reduced, the amount of lubricating oil that is indispensable for the compressor using the rotary motor is greatly increased. Can be reduced. This not only reduces the amount of waste oil that needs to be recycled, but also reduces the amount of refrigerant that dissolves in the oil, thereby reducing the amount of refrigerant charged into the compressor. It can also contribute to conservation.

  Further, in the air conditioner 212 according to the twelfth embodiment, the motor drive unit 50b operates in the calculation mode in which the linear vibration motor is in the non-operation state, similarly to the motor drive device 211 according to the eleventh embodiment, and sets the spring constant In the operation mode in which k is calculated and the linear vibration motor is operated, the position of the mover of the linear vibration motor is calculated using the calculated spring constant k. The position can be detected with high accuracy. As a result, the clearance between the piston and the cylinder head can be reduced, and the linear compressor can be downsized, and the air conditioner can be downsized.

(Embodiment 13)
FIG. 15 is a block diagram illustrating a refrigerator according to Embodiment 13 of the present invention.
The refrigerator 213 according to the thirteenth embodiment includes a linear compressor 60a, a compressor driving device 60b, a condenser 61, a refrigerator evaporator 62, and a throttle device 63.

  Here, the linear compressor 60a, the condenser 61, the expansion device 63, and the refrigerator compartment evaporator 62 form a refrigerant circulation path, and the compressor driving device 60b is a driving source of the linear compressor 60a. It is a motor drive unit that drives a certain linear vibration motor. Note that the linear compressor 60a and the motor driving unit 60b are the same as the linear compressor 40 and the motor driving device 211 of the eleventh embodiment, respectively.

  Similar to the throttle device 53 of the air conditioner 212 of Embodiment 12, the throttle device 63 throttles the flow rate of the liquid refrigerant sent from the condenser 61 while the refrigerant is circulating in the refrigerant circulation path. This expands the liquid refrigerant and supplies a necessary amount of the refrigerant to the refrigerator compartment evaporator 62 without excess or deficiency.

  The condenser 61 condenses the high-temperature and high-pressure refrigerant gas flowing inside and discharges the heat of the refrigerant to the outside air. The refrigerant gas sent into the condenser 61 loses heat by the outside air and gradually liquefies, and becomes a high-pressure liquid refrigerant near the outlet of the condenser.

  The refrigerator evaporator 62 cools the inside of the refrigerator by evaporating the low-temperature refrigerant liquid. The refrigerating compartment evaporator 62 has a blower 62a for increasing the efficiency of heat exchange and a temperature sensor 62b for detecting the temperature in the refrigerator.

  In the refrigerator 213, the motor drive unit 60b controls the output of the linear vibration motor of the linear compressor 60a based on the operation state of the refrigerator, that is, the target temperature set for the refrigerator and the temperature in the refrigerator. I do.

Next, the operation will be described.
In the refrigerator 213 according to the thirteenth embodiment, when the drive voltage Vd is applied from the motor drive unit 60b to the linear vibration motor of the linear compressor 60a, the linear compressor 60a is driven and the refrigerant flows through the arrow C in the refrigerant circulation path. And heat exchange is performed in the condenser 61 and the refrigerator evaporator 62. Thereby, the inside of the refrigerator is cooled.

  That is, the refrigerant that has become liquid in the condenser 61 expands as the flow rate is reduced by the expansion device 63, and becomes a low-temperature refrigerant liquid. Then, when the low-temperature liquid refrigerant is sent to the refrigerator compartment evaporator 62, the low-temperature refrigerant liquid evaporates in the refrigerator room evaporator 62 to cool the refrigerator. At this time, the air in the refrigerator compartment is forcibly sent into the refrigerator compartment evaporator 62 by the blower 62a, and the refrigerator compartment evaporator 62 exchanges heat efficiently.

  In the refrigerator 213 according to the thirteenth embodiment, the output of the linear vibration motor of the linear compressor 60a is controlled by the motor drive unit 60b based on the target temperature set for the refrigerator 213 and the room temperature in the refrigerator. Is done. Thereby, in refrigerator 213, the temperature in the refrigerator is maintained at the target temperature.

  As described above, in the refrigerator 213 according to the thirteenth embodiment, the linear compressor 60a that uses the linear vibration motor as a power source is used as the compressor that compresses and circulates the refrigerant. As in the case of the compressor 212, friction loss in the compressor is reduced as compared with a compressor using a rotary motor as a drive source, and the sealing performance of sealing the refrigerant of the compressor is improved, so that the operating efficiency of the compressor is improved. Can be increased.

  Furthermore, in the refrigerator 213 according to the thirteenth embodiment, since the friction loss in the compressor can be reduced, the amount of waste oil as the used lubricating oil and the compressor can be reduced similarly to the air conditioner 212 according to the twelfth embodiment. Thus, the amount of the refrigerant to be charged into the space is reduced. For this reason, there is also an effect that it can contribute to the preservation of the global environment.

  In the refrigerator 213 according to the thirteenth embodiment, the motor driving unit 60b sets the spring constant k of the spring member in the calculation mode in which the linear vibration motor is in the non-operation state, similarly to the motor driving device 211 according to the eleventh embodiment. In the operation mode in which the operation of the linear vibration motor is calculated, the position of the mover of the linear vibration motor is calculated using the calculated spring constant k. Therefore, during the operation of the linear compressor 60a, the position of the piston is determined. Detection can be performed with high accuracy. As a result, the clearance between the piston and the cylinder head can be reduced, and the size of the linear compressor can be reduced, and the size of the refrigerator can be reduced.

(Embodiment 14)
FIG. 16 is a block diagram illustrating a cryogenic refrigerator according to Embodiment 14 of the present invention.
The cryogenic refrigerator 214 according to the fourteenth embodiment has a freezing room (not shown), and cools the inside of the freezing room to a very low temperature state (−50 ° C. or lower). The object to be cooled by using the cryogenic refrigerator 214 includes an electro-magnetic circuit element such as a resistor used as a superconducting element, a coil and a magnet, an electronic component such as a low-temperature reference unit for an infrared sensor, and a medical device such as blood and internal organs. And frozen foods such as frozen tuna.

  The reason why the electronic components are kept at a very low temperature is to increase the operation efficiency or to increase the sensitivity by removing thermal noise, and in the case of foodstuffs, it is necessary to transport fresh foods, to maintain freshness and to dry the foods. is there.

  The refrigeration temperature varies depending on the application, but is −50 ° C. or lower, and particularly over a wide range of 0 to 100 K (Kelvin) in superconducting applications. For example, the cooling temperature of this cryogenic refrigerator is set to about 50 to 100K for high-temperature superconducting applications, and to about 0 to 50K for normal superconducting applications. When used for maintaining freshness of foods and the like, the cooling temperature of the cryogenic refrigeration system is set to a little less than -50C.

This will be specifically described below.
The cryogenic refrigerator 214 according to the fourteenth embodiment includes a linear compressor 70a, a compressor driving device 70b, a radiator 71, a regenerator 72, and an expansion device 73.
Here, the linear compressor 70a, the radiator 71, the expansion device 73, and the regenerator 72 form a refrigerant circulation path. The compressor drive unit 70b is a motor drive unit that drives and controls a linear vibration motor that is a drive source of the linear compressor 70a. Note that the linear compressor 70a and the motor driving unit 70b are the same as the linear compressor 40 and the motor driving device 211 of the eleventh embodiment, respectively.

The expansion device 73 is a device that expands the liquid refrigerant sent from the radiator 71 to the regenerator 72 in the same manner as the expansion device 53 of the twelfth embodiment.
The radiator 71 condenses the high-temperature and high-pressure refrigerant gas flowing inside and releases the heat of the refrigerant to the outside air, similarly to the condenser 61 of the refrigerator 213 of the thirteenth embodiment.

  The regenerator 72 cools the freezer compartment by evaporating the low-temperature refrigerant liquid to bring the object to be cooled to an extremely low temperature, similarly to the refrigerating room evaporator 62 of the thirteenth embodiment. Is provided with a temperature sensor 72b for detecting the temperature. As shown in FIG. 16, the regenerator 72 may have a blower 72a for increasing the efficiency of heat exchange.

  In the cryogenic refrigerator 214, the motor drive unit 70b performs linear compression based on the operating state of the cryogenic refrigerator, that is, the target temperature set for the cryogenic refrigerator and the temperature of the object to be frozen. The output of the linear vibration motor of the machine 70a.

  In the cryogenic refrigerator 214 according to the fourteenth embodiment, when the AC voltage Vd is applied from the motor drive unit 70b to the linear vibration motor of the linear compressor 70a, the linear compressor 70a is driven to drive the refrigerant in the refrigerant circulation path. Circulates in the direction of arrow D, and heat is exchanged between the radiator 71 and the regenerator 72. As a result, the inside of the freezer compartment is cooled, and the object to be cooled inside is cooled.

  That is, the refrigerant that has become liquid in the radiator 71 expands as the flow rate is reduced by the expansion device 73, and becomes a low-temperature refrigerant liquid. Then, when the low-temperature liquid refrigerant is sent to the regenerator 72, the low-temperature refrigerant liquid evaporates in the regenerator 72 to cool the freezing compartment.

  In the cryogenic refrigerator 214 according to the fourteenth embodiment, the motor drive unit 70b controls the linear compressor 70a based on the target temperature set for the cryogenic refrigerator 214 and the temperature of the object to be frozen. The output of the linear vibration motor is controlled. Thereby, in the cryogenic refrigerator 214, the temperature of the object to be frozen is maintained at the target temperature.

  As described above, in the cryogenic refrigerator 214 of the fourteenth embodiment, the linear compressor 70a that uses a linear vibration motor as a power source is used as the compressor that compresses and circulates the refrigerant. As with the air conditioner 212 of the present invention, the friction loss in the compressor is reduced as compared with a compressor using a rotary motor as a driving source, and the sealing performance for sealing the refrigerant of the compressor is improved. Operation efficiency can be improved.

  Further, in the cryogenic refrigerator 214 of the fourteenth embodiment, since the friction loss in the compressor can be reduced, the amount of waste oil that is used lubricating oil is generated similarly to the air conditioner 212 of the twelfth embodiment. And the amount of refrigerant to be charged into the compressor is reduced. For this reason, there is also an effect that it can contribute to the preservation of the global environment.

  Further, in the cryogenic refrigerator 214 according to the fourteenth embodiment, the motor drive unit 70b sets the spring constant k in an operation mode in which the linear vibration motor is in the non-operation state, similarly to the motor drive device 211 according to the eleventh embodiment. In the operation mode in which the operation of the linear vibration motor is performed, the position of the mover of the linear vibration motor is calculated using the calculated spring constant k. Therefore, during the operation of the linear compressor 70a, the position of the piston is determined. Detection can be performed with high accuracy. Thus, the clearance between the piston and the cylinder head can be reduced, and the size of the linear compressor can be reduced, and the size of the cryogenic refrigerator can be reduced.

(Embodiment 15)
FIG. 17 is a block diagram illustrating a water heater according to a fifteenth embodiment of the present invention.
A water heater 215 of the fifteenth embodiment includes a refrigeration cycle device 81a that heats supplied water to discharge hot water, a hot water storage tank 81b that stores hot water discharged from the refrigeration cycle device 81a, and a water connecting these components. It has pipes 86a, 86b, 87a, and 87b.

The refrigeration cycle device 81a includes a linear compressor 80a, a compressor driving device 80b, an air heat exchanger 82, a throttle device 83, and a water heat exchanger 85.
Here, the linear compressor 80a, the air heat exchanger 82, the expansion device 83, and the water heat exchanger 85 form a refrigerant circulation path.

  The compressor driving device 80b drives a linear vibration motor (not shown) that is a driving source of the linear compressor 80a. Note that the linear compressor 80a is the same as the linear compressor 40 having the linear vibration motor 46 of the eleventh embodiment. The compressor drive device 80b is a motor drive unit having the same configuration as the motor drive device 211 of the eleventh embodiment.

  The expansion device 83 expands the liquid refrigerant by reducing the flow rate of the liquid refrigerant sent from the water heat exchanger 85 to the air heat exchanger 82, similarly to the expansion device 53 of the air conditioner 212 of the twelfth embodiment. It is to let.

  The water heat exchanger 85 is a condenser that heats the water supplied to the refrigeration cycle device 81a, and has a temperature sensor 85a that detects the temperature of the heated water. The air heat exchanger 82 is an evaporator that absorbs heat from the surrounding atmosphere, and has a blower 82a for improving the heat exchange capacity and a temperature sensor 82b for detecting the surrounding temperature.

  In the figure, reference numeral 84 denotes a refrigerant pipe for circulating the refrigerant along a refrigerant circulation path formed by the linear compressor 80a, the water heat exchanger 85, the expansion device 83, and the air heat exchanger 82. The refrigerant pipe 84 is connected to a defrost bypass pipe 84a that supplies the refrigerant discharged from the linear compressor 80a to the air heat exchanger 82 by bypassing the water heat exchanger 85 and the expansion device 83, A defrost bypass valve 84b is provided in a part of the bypass pipe 84a.

  The hot water storage tank 81b has a hot water storage tank 88 for storing water or hot water. A water supply pipe 88c for externally supplying water into the hot water storage tank 88 is connected to a water receiving port 88c1 of the hot water storage tank 88, and a hot water outlet 88d1 of the hot water storage tank 88 is used to supply hot water from the hot water storage tank 88 to a bathtub. A bathtub hot water supply pipe 88d to be supplied is connected. A hot water supply pipe 89 for supplying the hot water stored in the tank 88 to the outside is connected to the water inlet / outlet 88a of the hot water storage tank 88.

  The hot water storage tank 88 and the water heat exchanger 85 of the refrigeration cycle device 81a are connected by pipes 86a, 86b, 87a, and 87b, and water circulates between the hot water storage tank 88 and the water heat exchanger 85. A road is formed.

  Here, the water pipe 86b is a pipe that supplies water from the hot water storage tank 88 to the water heat exchanger 85. One end of the water pipe 86b is connected to the water outlet 88b of the hot water storage tank 88, and the other end is connected via a joint 87b1. And is connected to the water inlet side pipe 87b of the water heat exchanger 85. A drain valve 88b1 for discharging water or hot water in the hot water storage tank 88 is attached to one end of the water pipe 86b. The water pipe 86a is a pipe for returning water from the water heat exchanger 85 to the hot water storage tank 88. One end of the water pipe 86a is connected to the water inlet / outlet 88a of the hot water storage tank 88, and the other end thereof is connected to the water heat through a joint 87a1. It is connected to the discharge pipe 87a of the exchanger 85.

A pump 87 for circulating water in the water circulation path is provided at a part of the water inlet side pipe 87b of the water heat exchanger 85.
Further, in this water heater 215, the motor drive unit 80b supplies the operating state of the water heater, that is, the target temperature of the hot water set for the water heater, from the hot water storage tank 81b to the water heat exchanger 85 of the refrigeration cycle device 81a. The motor output required for the linear vibration motor of the linear compressor 80a is determined based on the temperature of the supplied water and the outside air temperature.

Next, the operation will be described.
When an AC voltage Vd is applied from a motor driving unit 80b to a linear vibration motor (not shown) of the linear compressor 80a and the linear compressor 80a is driven, the high-temperature refrigerant compressed by the linear compressor 80a is indicated by an arrow E. The water is circulated in the direction, that is, is supplied to the water heat exchanger 85 through the refrigerant pipe 84. When the pump 87 in the water circulation path is driven, water is supplied from the hot water storage tank 88 to the water heat exchanger 85.

  Then, in the water heat exchanger 85, heat exchange is performed between the refrigerant and the water supplied from the hot water storage tank 88, and heat is transferred from the refrigerant to the water. That is, the supplied water is heated, and the heated water is supplied to the hot water storage tank 88. At this time, the temperature of the heated water is monitored by the condensation temperature sensor 85a.

  In the water heat exchanger 85, the refrigerant is condensed by the above heat exchange, and the condensed liquid refrigerant expands when its flow rate is restricted by the restriction device 83, and is sent to the air heat exchanger 82. In this water heater 215, the air heat exchanger 82 functions as an evaporator. That is, the air heat exchanger 82 absorbs heat from the outside air sent by the blower 82b and evaporates the low-temperature refrigerant liquid. At this time, the temperature of the atmosphere around the air heat exchanger 82 is monitored by the temperature sensor 82b.

  In the refrigeration cycle device 81a, when frost is formed on the air heat exchanger 82, the defrost bypass valve 84b is opened, and the high-temperature refrigerant is supplied to the air heat exchanger 82 via the defrost bypass passage 84a. . Thereby, defrosting of the air heat exchanger 82 is performed.

  On the other hand, hot water is supplied to the hot water storage tank 81b from the water heat exchanger 85 of the refrigeration cycle device 81a via the pipes 87a and 86a, and the supplied hot water is stored in the hot water storage tank 88. The hot water in the hot water storage tank 88 is supplied to the outside through a hot water supply pipe 89 as needed. In particular, when hot water is supplied to the bathtub, the hot water in the hot water storage tank is supplied to the bathtub through the bathtub hot water supply pipe 88d.

When the stored amount of water or hot water in the hot water storage tank 88 becomes equal to or less than a certain amount, water is supplied from outside via the water supply pipe 88c.
In the water heater 215 of the fifteenth embodiment, the motor drive unit 80b controls the target temperature of the hot water set for the water heater 215, the temperature of the water supplied to the water heat exchanger 85, and the outside air temperature. Based on the output, the output of the linear vibration motor of the linear compressor 80a is controlled. As a result, the hot water supply unit 215 supplies hot water having the target temperature.

  As described above, in the water heater 215 of the fifteenth embodiment, since the compressor that compresses and circulates the refrigerant in the refrigeration cycle device 81a uses the linear compressor 80a that uses a linear vibration motor as a power source, Similar to the air conditioner 212 of the twelfth embodiment, friction loss in the compressor is reduced and the sealing performance of the compressor for sealing the refrigerant is improved as compared with the compressor using a rotary motor as a power source. As a result, the operating efficiency of the compressor can be increased.

  Further, in the water heater 215 of the fifteenth embodiment, since the friction loss in the compressor can be reduced, the amount of waste oil as used lubricating oil and the amount of compression can be reduced, similarly to the air conditioner 212 of the twelfth embodiment. The amount of the refrigerant charged into the machine is reduced. For this reason, there is also an effect that it can contribute to the preservation of the global environment.

  In the water heater 215 of the fifteenth embodiment, the motor drive unit 80b calculates the spring constant k in the calculation mode in which the linear vibration motor is in the non-operation state, similarly to the motor drive device 211 of the eleventh embodiment, In the operation mode in which the operation of the linear vibration motor is performed, the position of the mover of the linear vibration motor is calculated using the calculated spring constant k. Therefore, during operation of the linear compressor 80a, the position of the piston is accurately determined. Can be detected. As a result, the clearance between the piston and the cylinder head can be reduced, and the size of the linear compressor and the size of the water heater can be reduced.

  In addition, the motor drive device which drives the linear vibration motor used as the power source of the air conditioner, the refrigerator, the cryogenic refrigerator, and the water heater is not limited to the one in the first embodiment, but is used in the second to tenth embodiments. Any one may be used.

(Embodiment 16)
FIG. 18 is a block diagram illustrating a mobile phone according to Embodiment 16 of the present invention.
The mobile phone 216 according to the sixteenth embodiment includes a vibrator 90a that vibrates mechanically and a driving device 90b that drives the vibrator 90a, and transmits an incoming call or the like to the user by vibration.

  Here, the vibrator 90a is disposed in the case 91 and is supported by a spring member 92 so as to vibrate, a weight 93, a magnet 93a fixed to a part of the weight member 93, and the case 91a. And a stator 94 in which a coil 94a is embedded, which is disposed to face the magnet 93a of the weight member 93. A linear vibration motor 95 is composed of a magnet 93a attached to the weight member 93 and a coil 94a embedded in the stator 94. The mover of the linear vibration motor 95 includes a weight member 93 and It is constituted by a magnet 93a. In the linear vibration motor 95, the weight member 93 reciprocates along the direction in which the spring member 92 expands and contracts due to the electromagnetic force generated between the coil 94a and the magnet 93a and the elastic force of the spring member 92.

  The driving device 90b according to the sixteenth embodiment is a motor driving unit 90b that drives a linear vibration motor 95 of the vibrator 90a using a battery (not shown) mounted on the mobile phone 216 as a power source. It has the same configuration as the motor driving device 101a according to the first embodiment.

  In the mobile phone 216 having such a configuration, when an incoming call is received, the weight member 93 reciprocates in the direction in which the spring member 92 expands and contracts due to the energization of the linear vibration motor 95 of the vibrator 90a from the motor drive unit 90b. Vibrate.

  That is, when the AC voltage Vd is applied to the coil 94a, an AC magnetic field is generated in the stator 94, and the magnet 93a is attracted to the magnetic field, and the magnet 93a and the weight member 93 to which the magnet 93a is fixed reciprocate. Start exercise.

  As described above, in the mobile phone 216 according to the sixteenth embodiment, the mechanical vibration is generated by the linear vibration motor 95. The vibration can be changed with two degrees of freedom, that is, the magnitude of the amplitude, and the vibrator 91 that notifies the user of an incoming call or the like by vibration can have various vibration variations.

  Further, in the mobile phone 216 of the sixteenth embodiment, the motor drive unit 90b calculates the spring constant k in the calculation mode in which the linear vibration motor is in the non-operation state, similarly to the motor drive device 101a of the first embodiment, In the operation mode in which the operation of the linear vibration motor is performed, the position of the mover is calculated using the calculated spring constant k. Therefore, during the operation of the linear vibration motor 95, the position of the mover is detected with high accuracy. be able to. Thus, the clearance between the mover and the case can be reduced, and the size of the linear vibration motor can be reduced, and the size of the mobile phone can be reduced.

  In the sixteenth embodiment, the motor driving device 101a according to the first embodiment is used as the motor driving unit 90b. However, the motor driving unit 90b includes the motor driving devices 101b to 101j according to the second to tenth embodiments. May be used.

  In the sixteenth embodiment, the case where the linear vibration motor and the driving device thereof according to the first embodiment are used as a vibrator for notifying an incoming call in a mobile phone by vibration and a driving control unit thereof is described. The linear vibration motor and the driving device thereof according to the first embodiment can be used as a power source of a reciprocating electric shaver and a driving unit thereof. Further, the motor driving devices 101b to 101j of the second to tenth embodiments are reciprocating electric shavers. It is needless to say that it can be used as a drive unit of the.

  The motor drive device according to the present invention calculates the spring constant or the mass spring ratio from the natural vibration frequency of the mover of the linear vibration motor, and thereby calculates the accuracy of the position of the mover calculated using the spring constant or the mass spring ratio. And the clearance between the mover and the motor housing can be reduced, which is extremely useful in reducing the size of the linear vibration motor.

FIG. 2 is a block diagram illustrating a motor driving device 101a according to the first embodiment of the present invention. FIG. 7 is a block diagram illustrating a motor driving device 101b according to a second embodiment of the present invention. FIG. 9 is a block diagram illustrating a motor driving device 101c according to a third embodiment of the present invention. FIG. 13 is a block diagram illustrating a motor driving device 101d according to a fourth embodiment of the present invention. FIG. 13 is a block diagram illustrating a motor driving device 101e according to a fifth embodiment of the present invention. FIG. 13 is a block diagram illustrating a motor driving device 101f according to a sixth embodiment of the present invention. FIG. 14 is a block diagram illustrating a motor driving device 101g according to a seventh embodiment of the present invention. FIG. 16 is a block diagram illustrating a motor driving device 101h according to an eighth embodiment of the present invention. FIG. 16 is a block diagram illustrating a motor driving device 101i according to a ninth embodiment of the present invention. FIG. 21 is a block diagram illustrating a motor driving device 101j according to a tenth embodiment of the present invention. FIG. 9 is a diagram showing an equivalent circuit of a linear vibration motor used in a conventional linear compressor. It is a figure explaining the coordinate system which shows the position of the mover of the above-mentioned linear vibration motor. FIG. 21 is a schematic diagram illustrating a motor driving device 211 according to an eleventh embodiment of the present invention. It is a schematic diagram explaining the air conditioner 212 according to Embodiment 12 of the present invention. It is a schematic diagram explaining refrigerator 213 according to Embodiment 13 of the present invention. It is a schematic diagram explaining a cryogenic refrigerator 214 according to Embodiment 14 of the present invention. It is a schematic diagram explaining the water heater 215 according to Embodiment 15 of the present invention. FIG. 21 is a schematic diagram illustrating a mobile phone 216 according to Embodiment 16 of the present invention.

Explanation of reference numerals

1a, 1d Motor driver 2a, 2e, 2f, 2g, 2h, 2i, 2j Mover position calculating unit 3a Mover forced vibration unit 4a Relative position detecting unit 5a Natural vibration frequency detecting unit 5b Natural angular frequency detecting unit 5c Natural vibration Period detectors 6a, 6b, 6c, 6d Spring constant determiner 9d Current detector 10d Voltage detector 10d1 Voltage sensor 11d Resonant frequency detector 12e Temperature detector 13e Spring constant estimator 14f, 14g, 14h, 14i, 14j Mass spring Ratio determination unit 15j Mass spring ratio estimation unit 40, 50a, 60a, 70a, 80a Linear compressor 41a Cylinder unit 41b Motor unit 42 Piston 43, 92 Support spring 44 Magnet 45 Electromagnet 46, 95, 100 Linear vibration motor 50b, 60b, 70b, 80b, 90b Motor drive unit 51 Indoor heat Exchanger 51b, 52b, 62b, 72b, 82b, 85a Temperature sensor 52 Outdoor heat exchanger 53, 63, 73, 83 Throttle device 54 Four-way valve 55 Indoor unit 56 Outdoor unit 61 Condenser 62 Refrigerating room evaporator 71 Radiator 72 regenerator 81a refrigeration cycle device 81b hot water tank 82 air heat exchanger 85 water heat exchanger 87 pump 88 hot water storage tank 90a vibrator 91 case 93 weight member 93a magnet 94 stator 94a coil 100 linear vibration motor 101a, 101b, 101c, 101d , 101e, 101f, 101g, 101h, 101i, 101j, 211 Motor driver 212 Air conditioner 213 Refrigerator 214 Cryogenic refrigerator 215 Water heater 216 Mobile phone Cd Current detection signal Cdr Drive current Cmnt Current monitor signal Df Frequency information k spring constant information Dk (t) estimated spring constant information Dpc position information Dpr timing information Drf resonance frequency information Drmk mass spring ratio information Drmk (t) estimated mass spring ratio information Dt period information Dtm motor temperature information Dω natural angular frequency information f Natural vibration frequency f 'Resonant frequency Ffv Forced vibration force k Spring constant k (t) Estimated spring constant L Equivalent inductance of winding Lps Mover stroke P Mover tip position Paru A certain point Pav Mover amplitude center position Pini Mover neutral position Psh Cylinder head position Pbd Bottom dead center position Ptd Top dead center position Px Position of mover R Winding equivalent resistance rmk Mass spring ratio rmk (t) Estimated mass spring ratio Sfc Drive frequency control signal T Natural oscillation period Tm Motor temperature Vd Voltage detection signal Vdr Drive voltage Vsns Voltage sensor output X, X ', X "Coordinate system x, x', x" Mover displacement ω Natural angular vibration Number (inherent angular velocity)

Claims (29)

A motor drive device that drives a linear vibration motor having a movable element provided to be able to reciprocate and a spring member that supports the movable element,
A mover forcibly vibrating section for freely vibrating the mover,
A vibration parameter acquisition unit that acquires a natural vibration parameter indicating a natural vibration of the mover based on a free vibration state of the mover,
A spring constant determining unit that calculates a spring constant of the spring member using the acquired natural vibration parameter;
Using a spring constant calculated by the spring constant determining unit, comprising a mover position calculating unit that calculates the position of the mover,
A motor drive device characterized by the above-mentioned. The motor driving device according to claim 1,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
A natural frequency detection unit that detects a natural vibration frequency, which is a natural vibration parameter of the mover, based on an output of the timing detection unit,
The spring constant determining unit multiplies the detected natural vibration frequency by twice the pi, squares the multiplication result, and multiplies the square of the multiplication result by the mass of the mover to obtain the spring constant. Calculate a constant,
A motor drive device characterized by the above-mentioned. The motor drive device according to claim 1,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
A natural angular frequency detector that detects a natural angular frequency, which is a natural vibration parameter of the mover, based on an output of the timing detector,
The spring constant determining unit squares the detected natural angular frequency, multiplies the square of the natural angular frequency by the mass of the mover, and calculates the spring constant.
A motor drive device characterized by the above-mentioned. The motor drive device according to claim 1,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
Based on the output of the timing detection unit, a natural vibration cycle detection unit that detects a natural vibration cycle that is a natural vibration parameter of the mover,
The spring constant determining unit divides the detected natural vibration period by twice the pi, squares the division result, and multiplies the square of the division result by the reciprocal of the mass of the mover. Calculate the reciprocal of the multiplication result and calculate the spring constant,
A motor drive device characterized by the above-mentioned. A motor drive device that drives a linear vibration motor having a movable element provided to be able to reciprocate and a spring member that supports the movable element,
A motor driver for applying a drive voltage to the linear vibration motor;
A current detection unit that detects a current supplied from the motor driver to the linear vibration motor;
A voltage detection unit that detects a voltage supplied from the motor driver to the linear vibration motor,
From the detected current and the detected voltage, a resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor,
The resonance drive frequency detected by the resonance frequency detection unit is multiplied by twice the pi, the multiplication result is squared, and the square of the multiplication result is multiplied by the mass of the mover to obtain the spring constant. A spring constant determining unit to be calculated;
Including a mover position calculation unit that calculates the position of the mover using the spring constant calculated by the spring constant determination unit,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 4,
The timing detector uses an induced voltage generated in a winding of the linear vibration motor by free vibration of the movable element, and the movable element that freely vibrates passes through a certain relative position with respect to a reference position of the vibration. Detect timing,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 4,
The mover forced vibration unit mechanically applies a force to the mover so that the mover freely vibrates,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 4,
The mover forced vibration unit, so that the mover freely vibrates, temporarily interrupts the current supplied to the linear vibration motor,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 4,
The mover forced vibration unit is configured to disconnect the load connected to the linear vibration motor from the linear vibration motor so that the mover freely vibrates,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 5,
A control unit that sets an operation mode to one of an operation mode for driving the linear vibration motor to drive a load connected to the linear vibration motor and an operation mode for calculating a spring constant of the spring member. Have
The control unit temporarily sets the operation mode to the calculation mode before the operation of the load starts,
The spring constant calculation unit calculates the spring constant in a calculation mode before the start of the operation of the load,
The mover position calculation unit calculates the position of the mover using the spring constant calculated before the operation of the load in the operation mode,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 5,
A control unit that sets an operation mode to one of an operation mode for driving the load connected to the linear vibration motor by driving the linear vibration motor and a calculation mode for calculating a spring constant of the spring member. Have
The control unit temporarily sets the operation mode to the calculation mode after the end of the operation of the load,
The spring constant calculation unit calculates the spring constant in an operation mode after the end of the operation of the load,
In the operation mode, the mover position calculation unit calculates the position of the mover using a spring constant calculated in a recently set calculation mode.
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 1 to 5,
A control unit that sets the operation mode to one of an operation mode for driving the linear vibration motor to drive a load connected to the linear vibration motor and an operation mode for calculating a spring constant of the spring member. ,
A temperature detector for detecting the temperature of the linear vibration motor,
A spring constant estimating unit for estimating a spring constant in the operation state of the load,
The control unit is configured to temporarily set the operation mode to the calculation mode at least at one time before or after the start of the operation of the load,
The spring constant estimating unit is:
In the calculation mode, the relationship between the temperature of the linear vibration motor and its spring constant is determined based on the calculated spring constant and the temperature detected by the temperature detection unit when the spring constant is calculated. Guidance,
In the operation mode, based on the temperature detected by the temperature detection unit, from the relationship between the temperature and the spring constant, to estimate a spring constant in an operation state of the load,
The mover position calculation unit calculates the position of the mover using the estimated spring constant in the operation mode.
A motor drive device characterized by the above-mentioned. A motor drive device that drives a linear vibration motor having a movable element provided to be able to reciprocate and a spring member that supports the movable element,
A mover forcibly vibrating section for freely vibrating the mover,
A vibration parameter acquisition unit that acquires a natural vibration parameter indicating a natural vibration of the mover based on a free vibration state of the mover,
Using the acquired natural vibration parameters, a mass spring ratio determining unit that calculates a mass spring ratio that is a value of a ratio between the mass of the mover and the spring constant of the spring member,
Using a mass spring ratio calculated by the mass spring ratio determining unit, comprising a mover position calculating unit that calculates the position of the mover,
A motor drive device characterized by the above-mentioned. The motor driving device according to claim 13,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
A natural frequency detection unit that detects a natural vibration frequency, which is a natural vibration parameter of the mover, based on an output of the timing detection unit,
The mass spring ratio determining unit multiplies the detected natural vibration frequency by twice the pi, squares the multiplication result, obtains the reciprocal of a value obtained by squaring the multiplication result, and calculates the mass Calculate the spring ratio,
A motor drive device characterized by the above-mentioned. The motor driving device according to claim 13,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
Based on the output of the timing detector, a natural angular frequency detection unit that detects a natural angular frequency that is a natural vibration parameter of the mover,
The mass spring ratio determining unit squares the detected natural angular frequency, calculates the reciprocal of a value obtained by squaring the natural angular frequency, and calculates the mass spring ratio.
A motor drive device characterized by the above-mentioned. The motor driving device according to claim 13,
The vibration parameter acquisition unit includes:
A timing detector that detects the timing at which the movable element that freely vibrates passes through a certain relative position with respect to the reference position of the vibration,
Based on the output of the timing detector, a natural vibration cycle detection unit that detects a natural vibration cycle that is a natural vibration parameter of the mover,
The mass spring ratio determining unit divides the detected natural vibration period by twice the pi, squares the result of the division, and calculates the mass spring ratio.
A motor drive device characterized by the above-mentioned. A motor drive device that drives a linear vibration motor having a movable element provided to be able to reciprocate and a spring member that supports the movable element,
A motor driver for applying a drive voltage to the linear vibration motor;
A current detection unit that detects a current supplied from the motor driver to the linear vibration motor;
A voltage detection unit that detects a voltage supplied from the motor driver to the linear vibration motor,
From the detected current and the detected voltage, a resonance frequency detection unit that detects a resonance drive frequency of the linear vibration motor,
The resonance drive frequency detected by the resonance frequency detection unit is multiplied by twice the pi, the multiplication result is squared, and the reciprocal of a value obtained by squaring the multiplication result is obtained. A mass spring ratio determining unit to be calculated;
Comprising a mover position calculation unit that calculates the position of the mover using the mass spring ratio calculated by the mass spring ratio determination unit,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 16,
The timing detector uses an induced voltage generated in a winding of the linear vibration motor by free vibration of the movable element, and the movable element that freely vibrates passes through a certain relative position with respect to a reference position of the vibration. Detect timing,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 16,
The mover forced vibration unit mechanically applies a force to the mover so that the mover freely vibrates,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 16,
The mover forced vibration unit, so that the mover freely vibrates, temporarily interrupts the current supplied to the linear vibration motor,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 16,
The mover forced vibration unit is configured to disconnect the load connected to the linear vibration motor from the linear vibration motor so that the mover freely vibrates,
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 17,
A control unit is provided for setting the operation mode to one of an operation mode for driving the linear vibration motor to drive a load connected to the linear vibration motor and a calculation mode for calculating the mass spring ratio. And
The control unit temporarily sets the operation mode to the calculation mode before the operation of the load starts,
The mass spring ratio calculation unit calculates the mass spring ratio in a calculation mode before the start of the operation of the load,
The mover position calculation unit calculates the position of the mover using the mass spring ratio calculated before the operation of the load in the operation mode.
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 17,
A control unit is provided for setting the operation mode to one of an operation mode for driving the linear vibration motor to drive a load connected to the linear vibration motor and a calculation mode for calculating the mass spring ratio. And
The control unit temporarily sets the operation mode to the calculation mode after the end of the operation of the load,
The mass spring ratio calculation unit calculates the mass spring ratio in an operation mode after the end of the operation of the load,
In the operation mode, the mover position calculation unit calculates the position of the mover using a mass spring ratio calculated in a recently set calculation mode.
A motor drive device characterized by the above-mentioned. The motor drive device according to any one of claims 13 to 17,
A control unit that sets an operation mode to one of an operation mode for driving the linear vibration motor to drive a load connected to the linear vibration motor and a calculation mode for calculating the mass spring ratio;
A temperature detector for detecting the temperature of the linear vibration motor,
A mass spring ratio estimating unit for estimating a mass spring ratio in the operation state of the load,
The control unit is configured to temporarily set the operation mode to the calculation mode at least at one time before or after the start of the operation of the load,
The mass spring ratio number estimating unit,
In the calculation mode, based on the calculated mass spring ratio and the temperature detected by the temperature detection unit when the mass spring ratio is calculated, the temperature of the linear vibration motor and its mass spring ratio are calculated. Lead the relationship,
In the operation mode, based on the temperature detected by the temperature detection unit, from the relationship between the temperature and the mass spring ratio, the mass spring ratio in the operation state of the load is estimated,
The mover position calculation unit, in the operation mode, calculates the position of the mover using the estimated mass spring ratio,
A motor drive device characterized by the above-mentioned. An air conditioner having a cylinder and a piston, comprising a compressor that compresses a fluid in the cylinder by reciprocating motion of the piston,
A linear vibration motor having a movable element provided to be capable of reciprocating movement, a spring member supporting the movable element, and reciprocating the piston;
A motor driving device for driving the linear vibration motor,
The motor driving device is the motor driving device according to any one of claims 1, 5, 13, and 17.
An air conditioner characterized by that: A refrigerator having a cylinder and a piston, comprising a compressor that compresses fluid in the cylinder by reciprocating motion of the piston,
A linear vibration motor having a movable element provided to be capable of reciprocating movement, a spring member supporting the movable element, and reciprocating the piston;
A motor driving device for driving the linear vibration motor,
The motor driving device is the motor driving device according to any one of claims 1, 5, 13, and 17.
A refrigerator characterized by that: A cryogenic refrigerator having a cylinder and a piston, comprising a compressor that compresses fluid in the cylinder by reciprocating motion of the piston,
A linear vibration motor having a movable element provided to be capable of reciprocating movement, a spring member supporting the movable element, and reciprocating the piston;
A motor driving device for driving the linear vibration motor,
The motor driving device is the motor driving device according to any one of claims 1, 5, 13, and 17.
A cryogenic refrigerator comprising: A water heater having a cylinder and a piston, comprising a compressor that compresses fluid in the cylinder by reciprocating motion of the piston,
A linear vibration motor having a movable element provided to be capable of reciprocating movement, a spring member supporting the movable element, and reciprocating the piston;
A motor driving device for driving the linear vibration motor,
The motor driving device is the motor driving device according to any one of claims 1, 5, 13, and 17.
A water heater characterized in that: A mobile phone including a linear vibration motor that generates vibration, and a motor driving device that drives the linear vibration motor,
The linear vibration motor has a mover provided so as to be able to reciprocate, and a spring member that supports the mover,
The motor driving device is the motor driving device according to any one of claims 1, 5, 13, and 17.
A mobile phone characterized by the above-mentioned.

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