JP2017028949A - Motor control device and drum-type washer or drum-type washer dryer including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor control device capable of efficiently driving a brushless motor in a range of speeds from low to high without influence of misalignment of magnetization of a Hall sensor magnet or variability of positions detected by a position detector.SOLUTION: A motor control device includes a brushless motor 2, a position detector 3 for detecting a rotor position of the brushless motor 2, an inverter control circuit for driving the brushless motor 2, and storage means 5 attached to the inverter control circuit. When the brushless motor 2 is rotated at a constant speed, the motor control device stores a duty ratio of an output signal of the position detector 3 on the storage means 5, and corrects the output signal of the position detector 3 based on the stored duty ratio when the brushless motor 2 is driven. Misalignment of magnetization of a Hall sensor magnet is corrected, to ensure accurate detection position correction function. The brushless motor 2 can be efficiently driven in a range of speeds from low to high.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor control device that controls a brushless motor, and a drum-type washing machine or a drum-type washing / drying machine including the same.

  Conventionally, in order to efficiently control a brushless motor from a low speed to a high speed, inverter control of a brushless motor provided with a position detector is often used (for example, refer to Patent Document 1).

  FIG. 8 shows a motor control device for driving a general brushless motor, and its configuration will be described below. The brushless motor 2 uses the signals of the brushless motor 2, the position detectors 3a, 3b, and 3c that detect the rotor position of the brushless motor 2, and the inverter 11 that drives the brushless motor 2, and the position detectors 3a, 3b, and 3c. And an inverter control circuit having a drive circuit 62 and a control circuit 64 that controls the inverter 11 that drives the drive.

  The position detectors 3a, 3b, and 3c built in the brushless motor 2 are generally used, for example, by using a Hall IC that outputs, as a signal, the magnetic flux direction of a position detecting Hall sensor magnet that is mounted coaxially with the rotor. Is. The inverter 11 is supplied with a voltage obtained by rectifying the AC power supply 53 with the diode bridge 55 and smoothing with the capacitors 56a and 56b. The inverter 11 includes six switching elements SWU, SWV, SWW, SWX, SWY, SWZ and six diodes 60a, 60b, 60c, 61a, 61b, 61c.

  The control of the brushless motor 2 uses the signals of the position detectors 3a, 3b, 3c built in the brushless motor 2, and the control circuit 64 detects the speed and position of the brushless motor 2 from the signals, and the switching of the inverter 11 is performed. The brushless motor 2 is controlled by generating a PWM signal for driving the element, amplifying and converting the voltage to drive the switching elements SWU, SWV, SWW, SWX, SWY, and SWZ by the drive circuit 62 and driving the inverter 11. To do.

  By the way, when trying to detect the magnetic flux of the Hall sensor magnet by using, for example, a Hall IC for the position detectors 3a, 3b, 3c built in the brushless motor 2, the accuracy of mounting the Hall IC, for example, a printed wiring board The output of the position detectors 3a, 3b, 3c is affected by the positional accuracy of mounting on the PCB, the positional accuracy of fixing the printed wiring board to the brushless motor 2, the mechanical accuracy of the rotor of the brushless motor 2, the accuracy of magnetization, etc. The signal has a phase shift with respect to the position of the rotor to be detected originally, that is, the position of the signal of the position detector which should be relative to the induced voltage of the rotor.

  Deviations in the signals of the position detectors 3a, 3b, 3c, that is, the detected value of the position of the rotor of the brushless motor 2, cause a decrease in efficiency when the brushless motor 2 is driven, and increase the heat generation of the motor. In addition, this tendency increases as the rotation speed of the brushless motor 2 increases. In particular, the induced voltage of the brushless motor 2 is not negligible with respect to the power supply voltage, and becomes noticeable when the advance angle control is performed.

In order to prevent this, a phase of a sine wave voltage generated when a sine wave voltage having a preset voltage and frequency is supplied to the brushless motor 2 and driven in an open loop, and an output signal of the position detectors 3a, 3b, 3c. When the brushless motor 2 is driven by performing feedback control based on the position signals output from the position detectors 3a, 3b, and 3c while detecting the amount of deviation from the phase of the motor and storing it in the storage means 5. By correcting the sinusoidal voltage supplied to the brushless motor 2 based on the amount of deviation, the position detectors 3a, 3b, and 3c are hardly affected by the deviation.

JP 2011-104070 A

  However, such a conventional motor control device is a correction for the positional attachment deviation of the Hall IC and does not consider the magnetization deviation of the Hall sensor magnet. The Hall sensor magnet indicates the direction of the magnetic flux of the rotor magnet. However, there may be a case where the Hall sensor magnet is deviated due to a shaft misalignment or the like in the factory magnetization process. The conventional motor control device cannot completely correct the magnetizing deviation of the Hall sensor magnet, and there is a problem that the efficiency decreases or the motor vibration / noise occurs when the brushless motor is driven. .

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems. In a brushless motor control device, a brushless motor is efficiently provided from a low speed to a high speed by having a function of correcting a magnetization deviation of a Hall sensor magnet and a positional attachment deviation of a Hall IC. An object of the present invention is to provide a motor control device that can reduce vibration and noise.

  In order to achieve the above object, the present invention provides a motor control device comprising: a brushless motor; a position detector that detects a rotor position of the brushless motor; an inverter control circuit that drives the brushless motor; and the inverter control circuit. And a storage means associated therewith, when the brushless motor is rotated at a constant speed, the duty ratio of the output signal of the position detector is stored in the storage means, and is stored when the brushless motor is driven. The motor control device corrects the output signal of the position detector based on a duty ratio.

  Thereby, the magnetization deviation of the Hall sensor magnet and the positional attachment deviation of the Hall IC are accurately corrected, the brushless motor is driven efficiently from low speed to high speed, and vibration and noise are reduced.

  The motor control device of the present invention has a function of correcting the magnetization deviation of the Hall sensor magnet and the positional attachment deviation of the Hall IC, and can realize a motor control device that efficiently drives a brushless motor from low speed to high speed. .

Configuration diagram of a motor control device in Embodiment 1 of the present invention The figure which shows the relationship between the induced voltage of a brushless motor driven by the motor control apparatus, and a position detection signal The figure which shows the relationship in the ideal case of the line induced voltage of the brushless motor driven by the motor control apparatus, and the signal of a position detector The figure which shows the relationship when the signal between a line induction voltage of a brushless motor driven by the motor control device and a position detector is shifted due to the magnetization deviation of the Hall sensor magnet. The figure which shows the relationship when the signal of a line | wire induced voltage of a brushless motor driven by the motor control apparatus and a position detector with a shift | offset | difference by the magnetizing shift | offset | difference of a Hall sensor magnet and the position mounting shift | offset | difference of a Hall IC. Explanatory drawing of the operation model of the brushless motor driven by the motor controller Explanatory drawing when distortion occurs in the output current waveform of the brushless motor driven by the motor control device due to the magnetization deviation of the Hall sensor magnet Circuit diagram of conventional motor controller

  1st invention has a brushless motor, a position detector which detects a rotor position of the brushless motor, an inverter control circuit which drives the brushless motor, and a storage means attached to the inverter control circuit, When the brushless motor is rotated at a constant speed, the duty ratio of the output signal of the position detector is stored in the storage means, and the position detector is based on the stored duty ratio when the brushless motor is driven. Correct the output signal. As a result, it is possible to correct the duty ratio of the output signal of the non-uniform position detector caused by the magnetization deviation of the Hall sensor magnet, efficiently drive the brushless motor from low speed to high speed, and reduce vibration and noise. be able to.

  In a second aspect based on the first aspect, the position detector outputs a detection position as a signal of H / L, and is output from the position detector when the brushless motor is rotated at a constant speed. The H / L duty ratio is stored in the storage means, and at least when the brushless motor is rotating at a constant speed when the brushless motor is driven, the supply voltage to the brushless motor has a sinusoidal waveform without distortion. The output voltage from the inverter control circuit is adjusted based on the output signal of the position detector and the stored H / L duty ratio. As a result, the brushless motor can be driven with a sine wave voltage without distortion, and the brushless motor can be driven efficiently from low speed to high speed, and vibration and noise can be reduced.

  According to a third aspect, in the first or second aspect, when the brushless motor is rotated at a constant speed, an H / L signal phase output from the position detector and the brushless motor are supplied to the brushless motor. The phase shift amount with respect to the voltage phase to be stored is stored in the storage means, and the output voltage from the inverter control circuit is based on the output signal of the position detector and the stored phase shift amount when the brushless motor is driven. Adjust. This makes it possible to detect misalignment of the hose IC in addition to the misalignment of the Hall sensor magnet, efficiently drive the brushless motor from low speed to high speed, and reduce vibration and noise.

  According to a fourth invention, in any one of the first to third inventions, when the brushless motor is rotated at a constant speed, the duty ratio of the output signal of the position detector and the position detector A phase shift amount between the output H / L signal phase and the voltage phase supplied to the brushless motor is stored in the storage means, and the stored duty ratio and the stored are stored when the brushless motor is driven. Based on the amount of phase shift, the output signal of the position detector is corrected to calculate the rotation speed of the brushless motor. As a result, the magnetizing deviation of the Hall sensor magnet and the positional attachment deviation of the hose IC can be corrected, and the rotational speed of the brushless motor calculated from the output signal of the position detector can be estimated more accurately. The brushless motor can be driven efficiently from low to high speed, and vibration and noise can be reduced.

  5th invention mounts the motor control apparatus of any one of the said 1st-4th invention in a drum type washing machine or a drum type washing-drying machine, at the time of washing or drying which drives a brushless motor at low speed The brushless motor can be driven efficiently from the time of dehydration to high speed driving, and an efficient washing machine or washing dryer can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a configuration diagram of a motor control device according to Embodiment 1 of the present invention. The brushless motor 2 is driven by an inverter control circuit including an inverter 11 and a drive circuit (not shown).

  The inverter 11 for driving the brushless motor 2 includes switching elements SWU and SWX, SWV and SWY, two sets connected in series of SWW and SWZ, three sets in parallel, and a total of six switching elements. In FIG. 1, an IGBT is used as a switching element as an example. The connection point of a set of two switching elements, for example, the lower side (emitter side) of SWU and the upper side (collector side) of SWX are connected, and winding U (the U-phase of U-phase) of brushless motor 2 is connected from that connection point. Connected to the winding). Low resistances RU, RV, and RW, which are current detection resistors, are individually connected to the emitter side of each lower switching element connected in series, and the other end of each low resistance is an inverter power supply (not shown). Is connected to the negative side of

  Both ends of each current detection low resistance RU, RV, RW are input to the current detection circuit 4. Each low resistance RU, RV, RW and the current detection circuit 4 constitute a current detector 10 that detects a current flowing through the winding of each phase of the brushless motor 2. The current detection circuit 4 amplifies voltages at both ends of the low resistances RU, RV, and RW, and outputs them as analog signals iu, iv, and iw. This signal is input to a control circuit 1 constituted by a microcomputer or the like, performs A / D conversion, and is used as a current detection value for speed control, torque control, and the like of the brushless motor 2.

  A position detector 3 is mounted on the brushless motor 2. Like the position detectors 3a, 3b, and 3c of the conventional example, the position detector 3 is composed of, for example, three Hall ICs and is collectively referred to as the position detector 3. The output signal CS of the position detector 3 is input to a control circuit 1 constituted by a microcomputer or the like, and is used for speed control, torque control, etc. of the brushless motor 2 in the same manner as the current detection signal described above.

  FIG. 1 is an example of the embodiment, and a switching element such as a MOSFET or a bipolar transistor can be used as a switching element to be used. Further, the configuration using three low current detection resistors as an example of the configuration of the current detector has been described as an example. However, for example, a single current detection resistor may be configured.

FIG. 2 is a diagram showing a signal relationship between the induced voltage of the brushless motor driven by the motor control apparatus according to Embodiment 1 of the present invention and the position detector. The windings of the brushless motor 2 are U phase, V phase, and W phase. When the rotor of the brushless motor 2 is rotated from the outside, the induced voltage generated at the U-phase winding terminal from the neutral point is Eu, the induced voltage generated at the V-phase winding is Ev, and the W-phase winding is The generated voltage is Ew. In general, the neutral point does not often appear as a terminal outside the brushless motor 2 and is often represented by a line voltage. The induced line voltage generated at the U phase winding terminal with respect to the W phase winding terminal is Euw, and the induced line voltage generated at the V phase winding terminal with respect to the U phase winding terminal is Evu, V phase. Ewv is the line induced voltage generated at the W-phase winding terminal with reference to the winding terminal.

  In general, three output signals from the position detector 3 are output in a three-phase brushless motor. CS1, CS2, and CS3 shown in FIG. 2 are examples of output signals of the position detector 3. CS1 is the above-described line-induced voltage Euw, CS2 is the line-induced voltage Evu, and CS3 is the line-induced voltage Ewv. This is a synchronized signal, that is, a signal whose logic changes when each line-induced voltage is 0 V (zero volts). In FIG. 2, the signal of the position detector 3 is synchronized with the induced voltage between the lines, but it may be a signal synchronized with Eu, Ev, Ew that is the induced voltage of each phase.

  The position detector 3 generally detects the magnetic flux of the position detecting Hall sensor magnet mounted coaxially with the rotor by a Hall element, Hall IC or the like. At this time, there are variability factors such as the accuracy of magnetization, the mounting accuracy of the Hall element or Hall IC to the printed wiring board, the accuracy of mounting the printed wiring board inside the brushless motor, and the detection sensitivity of the Hall element or Hall IC magnetic flux. . The description will be given using the line induced voltage Euw of the brushless motor 2 described with reference to FIG. 2 and CS1 which is one of the output signals of the position detector 3.

  FIG. 3 is an example of a diagram showing an ideal relationship between the line induced voltage of the brushless motor driven by the motor control apparatus according to Embodiment 1 of the present invention and the signal of the position detector. The position detection signal CS1 is synchronized with the line induced voltage Euw. That is, the logic of the position detection signal CS1 changes at the position where the line-to-line induced voltage Euw is 0 V (zero volt) and zero cross.

  4 and 5 are examples of diagrams in the case where the line-induced voltage and the position detector signal are shifted. FIG. 4 shows an example in which the output signal ratio (duty ratio) of the position detection signal CS1 is different from the line induced voltage Euw due to the magnetization deviation of the Hall sensor magnet. FIG. 5 shows an example of a deviation between the position detection signal CS1 obtained by adding up the magnetization deviation of the Hall sensor magnet and the deviation of the Hall IC attachment position and the line induced voltage Euw.

  Hereinafter, the operation and action of the motor control device according to Embodiment 1 of the present invention will be described. First, a method for correcting the magnetization deviation of the Hall sensor magnet will be described.

  FIG. 6 is an explanatory diagram of an operation model of a brushless motor driven by the motor control device. The relationship between the induced voltage and the output signal of the position detector when the brushless motor of FIG. 6 is rotated clockwise is as shown in FIG. FIG. 6 shows a two-pole model for ease of explanation. In the two-pole model, the electrical angle and the mechanical angle are the same value.

  In FIG. 6, the stator has three windings: a U-phase winding U, a V-phase winding V, and a W-phase winding W. A magnet is arranged on the rotor. Let us consider the rotation coordinate of the angle θ in the clockwise direction with the direction of the U phase of the winding as the origin. An axis a is set to an arbitrary angle θ, and an axis b is set to a coordinate axis in a direction orthogonal to the axis a. The magnetic pole inside the stator that is generated when current is supplied from the winding of each stator is defined as N pole.

  Now, when the current vector, which is the combined current of each winding, is set to the direction of the angle θ, that is, when the combined current is flowed from the positive direction of the a-axis in FIG. 6, N in the positive direction of the a-axis of the stator in FIG. A pole is generated in the negative direction of the a-axis. The rotor of the brushless motor 2 is attracted in the direction of the S pole in the positive direction of the a-axis and the N pole in the negative direction by the attraction and repulsion action with the magnetic poles of the stator. When the angle θ is slowly rotated in this state, the rotor of the brushless motor 2 also rotates slowly while maintaining the S pole in the positive direction of the a-axis and the N pole in the negative direction. When the angle θ is rotated, the output signal of the position detector 3 also changes as the rotor of the brushless motor 2 rotates. The rotation of the angle θ for 360 ° electrical angle (mechanical angle) is performed.

  FIG. 4 shows the relationship between the line induced voltage Euw and the position detector output signal CS1 when the magnetization of the Hall sensor magnet is deviated. At this time, the L section where the output signal CS1 of the position detector 3 switches from H → L → H is measured as ΔTL, and the H section where the output signal CS1 switches from L → H → L is measured as ΔTH, and one cycle is 360 °. The respective duty ratios of the H section and the L section are obtained by Expression 1.

  When the Hall sensor magnet is correctly magnetized, the duty ratios in the H section and the L section are the same. In the case of FIG. 4, a difference in the ratio between the duty ratios of the H section and the L section occurs due to the magnetization deviation of the Hall sensor magnet. In order to correct the magnetization deviation of the Hall sensor magnet, the correction coefficient of the magnetization deviation of the Hall sensor magnet is obtained from the duty ratio theoretically obtained when there is no magnetization deviation and is connected to the control circuit 1 and attached. Store in the storage means 5. After that, during normal motor driving, the H / L period obtained from the position detector 3 is multiplied by the stored magnetization deviation correction coefficient according to Equation 3 to correct the original period.

  As described above, according to the motor control device in the first embodiment, the duty ratio of the output signal of the non-uniform position detector caused by the magnetization deviation of the Hall sensor magnet can be corrected. The brushless motor 2 can be driven efficiently and vibration and noise can be reduced.

(Embodiment 2)
The rotor position of the brushless motor 2 when controlling the brushless motor 2 is obtained by interpolating the rotor position for each control cycle using the signals CS1, CS2 and CS3 which are the outputs of the position detector 3 described above. I do. Therefore, if there is a deviation in the output signal of the position detector 3 as shown in FIG. 7, the output current waveform is distorted or the phase of the current is advanced or delayed with respect to the position of the rotor of the brushless motor 2. Adverse effects such as noise and noise.

  In the motor control device according to the second embodiment of the present invention, the interpolation calculation of the rotor position is more reliably performed by correcting the control cycle using the duty ratio due to the magnetization deviation of the Hall sensor magnet as shown in the first embodiment. When the brushless motor 2 is driven, at least while the brushless motor 2 is rotating at a constant speed, the inverter 11 and the drive circuit are configured so that the supply voltage to the brushless motor 2 has a sine wave waveform without distortion. An output voltage from an inverter control circuit (not shown) or the like is adjusted.

  Thereby, the brushless motor 2 can be driven with a sine wave voltage without distortion, and the brushless motor 2 can be driven efficiently from low speed to high speed, and vibration and noise can be reduced.

(Embodiment 3)
Further, consider the case where there is both a magnetization deviation of the Hall sensor magnet and a position attachment deviation of the Hall IC as shown in FIG. The Hall sensor magnet magnetization deviation and the Hall IC position attachment deviation are summed as the phase deviation of the output signal of the position detector 3, so that not only the Hall sensor magnet magnetization deviation but also the Hall IC position attachment deviation occurs. It is necessary to correct at the same time.

  Here, a correction method for the Hall IC position attachment deviation of the motor control device according to the third embodiment of the present invention will be described. The correction method for the magnetization deviation of the Hall sensor magnet is the same as that in the first embodiment, and the description thereof is omitted. Further, the correction order of the magnetization deviation of the Hall sensor magnet and the position attachment deviation of the Hall IC can be changed back and forth.

  As described in the first embodiment, the current control of the brushless motor 2 is performed, and the change point of the signal of the position detector 3 is detected by slowly rotating the rotor angle θ.

A current control method when detecting the correction value of the position detection signal of the brushless motor 2 will be described. Consider the detection ab axis current command. The a-axis current command is Ia *, the b-axis current command is Ib *, and the current command is Ia * = I
Ib * = 0
And I is I> 0. The angle θ between the winding U and the a axis is an arbitrary value. The current iu of the winding U, the current iv of the winding V, and the current iw of the winding W are converted into currents ia and ib on the ab axis by Expression 4.

  Current control is performed between the current commands ia * and ib * on the ab axis and the currents ia and ib obtained by the previous equation, and the applied voltages va and vb to the brushless motor 2 on the ab axis are determined. For example, PI control is performed as current control. The difference between the current command Ia * on the a-axis and the current detection value ia is Δia, the proportionality constant is Kpa, the integration constant is Kia, the difference between the current command Ib * on the b-axis and the current detection value ib is Δib, the proportionality constant Is Kpb, and the integration constant is Kib, the applied voltages va and vb to the brushless motor 2 on the ab axis are obtained by the following Equation 5.

  The voltages va and vb applied to the brushless motor 2 on the ab axis thus obtained are converted into voltages Vu, Vv and Vw of the three-phase winding by Expression 6.

  When detecting the correction value of the position detection signal, current control is performed by applying the voltage of the three-phase winding thus obtained to the brushless motor 2 from the inverter 11. With this current control, the current vector, which is a combination of the winding currents, is controlled in the positive direction of the a axis, and the angle θ is the direction of the current vector.

  Next, details of the method for detecting the direction θ of the current vector will be described. With reference to the induced voltage of the brushless motor and the output signal of the position detector shown in FIG. 2, the detection of the changing point from H to L of the signal CS1 during clockwise rotation will be described as a representative.

  From FIG. 2, the position at the electrical angle of 30 degrees is an ideal position of the changing point from H to L of the signal CS1 at the time of clockwise rotation. Let this ideal position be θcs1 *. On the other hand, the current vector is slowly rotated while performing the current control. When the direction θ of the current vector is gradually increased, the rotor of the brushless motor 2 rotates clockwise, and CS1 which is one of the output signals of the position detector 3 changes from H to L around 30 °. The direction of the current vector at this time is θcs1. For example, as shown in FIG. 3, when the signal CS1 almost coincides with 0 V (zero volt) of the line induced voltage Euw, θcs1 is about 30 °. Further, as shown in FIG. 5, when the signal CS1 is delayed from the line induced voltage Euw, θcs1 becomes a value larger than 30 °.

  In the motor control apparatus according to the third embodiment, the detected θcs1 is used as a correction value for the position detection signal, the difference between the ideal position and θcs1 * is stored in the storage means 5 in FIG. Based on the output signal of the position detector 3 and the stored phase shift amount, the phase shift of the output voltage from the inverter control circuit including the inverter 11 and the drive circuit (not shown) is corrected and adjusted. This makes it possible to detect misalignment of the hose IC in addition to the misalignment of the Hall sensor magnet, efficiently drive the brushless motor 2, and reduce vibration and noise.

(Embodiment 4)
Further, in the control drive of the brushless motor 2, the rotation speed of the brushless motor 2 is calculated based on the interval data of the output signal of the position detector 3.

  As shown in FIG. 2, the position information of the position detection signal generally changes every 60 ° in electrical angle. At the time of motor low-speed rotation such as washing, the output signal interval time of the position detector 3 is measured every 60 ° to calculate the motor rotation speed. During motor high-speed rotation such as dehydration, the output signal interval time of the position detector 3 is measured every 360 °, and the motor rotation speed is calculated. Due to the deviation of magnetization of the Hall sensor magnet and the deviation of the Hall IC mounting position, the output signal of the position detector 3 is deviated, which affects the calculation of the motor rotation speed and has an adverse effect such as a reduction in efficiency and noise.

  In the motor control device in the fourth embodiment, when the brushless motor 2 is rotated at a constant speed in the motor control devices in the first to third embodiments, the duty ratio of the output signal of the position detector 3 and the position The phase shift amount between the H / L signal phase output from the detector 3 and the voltage phase supplied to the brushless motor 2 is stored in the storage means 5, and when the brushless motor 2 is driven, the stored duty ratio and Based on the stored phase shift amount, the output signal of the position detector 3 is corrected to calculate the rotation speed of the brushless motor 2.

  This makes it possible to more accurately calculate the motor rotational speed by correcting the deviation of the Hall sensor magnet magnetization and the Hall IC mounting position, thereby improving the efficiency of brushless motor drive and reducing vibration noise. it can.

(Embodiment 5)
The drum type washing machine or the drum type washing and drying machine needs to be driven at a low speed and a large torque at the time of washing and at a high speed and a low torque at the time of dehydration. When a brushless motor is used as a drum driving motor of a drum-type washing machine or drum-type washing / drying machine, it is desired to increase the induced voltage to some extent in order to ensure efficiency during washing. Therefore, since the induced voltage of the motor is relatively high with respect to the power supply voltage during dehydration, it is common to perform advance angle control.

  The drum-type washing machine or the drum-type washing / drying machine according to the fifth embodiment can efficiently drive the drum containing the laundry by mounting the motor control device of the present invention, so that the drum type is efficient. A washing machine or a drum-type washing and drying machine can be realized.

  As described above, the motor control device according to the present invention is a motor control device that efficiently drives a brushless motor from a low speed to a high speed without being affected by the magnetization deviation of the Hall sensor magnet and the variation in the detection position of the position detector. Therefore, it is useful as a motor control device for a brushless motor driven by inverter control used in a drum-type washing machine, a drum-type washing dryer, or the like.

DESCRIPTION OF SYMBOLS 1 Control circuit 2 Brushless motor 3 Position detector 4 Current detection circuit 5 Memory | storage means 10 Current detector 11 Inverter (inverter control circuit)

Claims (5)

A brushless motor; a position detector that detects a rotor position of the brushless motor; an inverter control circuit that drives the brushless motor; and a storage unit that accompanies the inverter control circuit. When rotated, the duty ratio of the output signal of the position detector is stored in the storage means, and the output signal of the position detector is corrected based on the stored duty ratio when the brushless motor is driven. The motor control apparatus characterized by the above-mentioned. The position detector outputs the detected position as an H / L signal, and stores the H / L duty ratio output from the position detector in the storage means when the brushless motor is rotated at a constant speed. At the time of driving the brushless motor, at least while the brushless motor is rotating at a constant speed, the output signal of the position detector so that the supply voltage to the brushless motor has a sine wave waveform without distortion, The motor control device according to claim 1, wherein an output voltage from the inverter control circuit is adjusted based on the stored H / L duty ratio. When the brushless motor is rotated at a constant speed, the phase shift amount between the H / L signal phase output from the position detector and the voltage phase supplied to the brushless motor is stored in the storage means. 3. The output voltage from the inverter control circuit is adjusted based on the output signal of the position detector and the stored amount of phase shift when the brushless motor is driven. 4. Motor control device. When the brushless motor is rotated at a constant speed, the duty ratio of the output signal of the position detector, the H / L signal phase output from the position detector, and the voltage phase supplied to the brushless motor, And the phase shift amount of the position detector is corrected based on the stored duty ratio and the stored phase shift amount when the brushless motor is driven. The motor control device according to claim 1, wherein the rotational speed of the brushless motor is calculated. A drum type washing machine or a drum type washing and drying machine provided with the motor control device according to any one of claims 1 to 4.

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