JP2018182988A - Motor driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a given damper function even in the event of blackout.SOLUTION: A motor driving device 1 according to an embodiment of the present invention is a motor driving device which drives a motor 10 including coil units 11A to 11C of three phases. The motor driving device comprises: a drive circuit 20; and a switch circuit 30. The drive circuit 20 has three output terminals 24A to 24C which can be electrically connected to the coil units 11A to 11C, and generates a three phase-driving current to be supplied to the respective coil units through the output terminals. The switch circuit 30 is provided between the motor and the drive circuit. The switch circuit 30 is arranged to be able to selectively switch between a connection state of respectively connecting between the output terminals 24A to 24C and the coil units 11A to 11C, and a short circuited state of respectively cutting between the output terminals and the coil units to short circuit the coil parts to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor drive device applicable to, for example, a damper for an automobile.

  Conventionally, a so-called electromagnetic damper device (electromagnetic suspension device) that generates a damping force by an electromagnetic force is known. This electromagnetic damper device has a magnet member provided on one side of the vehicle body side and the wheel side, and a coil member provided on the other side, and receives a force in the vertical direction of the wheel to receive the coil member and the magnet member. And a motor generating a damping force by an electromagnetic force generated by relative displacement of As a motor, for example, a linear motor or a rotary motor is used (see, for example, Patent Document 1).

  In this type of electromagnetic damper device, a motor is typically provided with three-phase windings of U, V, and W, and a voltage of a sine wave is applied to each of the three-phase windings by an inverter. And a drive circuit that performs PWM (Pulse Width Modulation) control. The damping force can be adjusted by the amount of current flowing through the coil member, and a large damping force can be obtained, for example, by positively supplying a current to the coil member using a battery power supply (for example, a patent) Reference 2).

JP, 2008-62738, A JP 2007-161100 A

  As described in Patent Document 2, in the conventional electromagnetic damper device, the inverter circuit and the motor are directly connected. For this reason, for example, when the external power supply (battery) is lost, the electromagnetic coils of each phase of the motor are in an open state, and as a result, there is a problem that the damper function is lost due to the motor being in a free state.

  In view of the above circumstances, an object of the present invention is to provide a motor drive device capable of securing a predetermined damper function even when power is lost.

In order to achieve the above object, a motor drive device according to an aspect of the present invention includes a first coil portion to which a first drive current having a first phase can be supplied, and a second coil portion different from the first phase. A second coil portion capable of conducting a second drive current having a phase of 3 and a third coil portion capable of conducting a third drive current having a third phase different from the first and second phases. A motor drive device for driving a motor including the drive circuit and the switch circuit.
The drive circuit includes a first output terminal electrically connectable to the first coil portion, a second output terminal electrically connectable to the second coil portion, and the third coil. And a third output terminal electrically connectable to the part. The drive circuit generates the first to third drive currents respectively supplied to the first to third coil parts via the first to third output terminals.
The switch circuit is interposed between the motor and the drive circuit. The switch circuit has a connection state in which the first to third output terminals and the first to third coil portions are connected to each other, the first to third output terminals, and the first to third output terminals. It is configured to be selectively switchable between a short circuit state in which the first to third coil sections are mutually short-circuited by interrupting the coil sections 3 and 3 respectively.

  In the motor drive device described above, when the switch circuit is in a short circuited state, the coil portions of the respective phases constituting the electromagnetic coil are in a shorted state with each other. An induced electromotive force is generated in the part to generate a predetermined electromagnetic force that inhibits the relative displacement. Therefore, even when the external power supply is lost, for example, the switch circuit is switched to the short circuit state, whereby a predetermined damper function by the motor is secured.

The motor drive device may further include a power supply monitoring unit that monitors power supply to the drive circuit. The power supply monitoring unit outputs, to the switch circuit, a first switching signal for switching the connection state to the short circuit state when the power supply to the drive circuit is cut off.
As a result, the switch circuit is automatically switched to the short circuit state when the power is shut off, so that the intended damper function is secured even when the external power is lost.

The power supply monitoring unit may be configured to output a second switching signal for switching from the short circuit state to the connection state to the switch circuit when power supply to the drive circuit is resumed.
Thus, the switch circuit can be automatically returned to the connected state when the power is restored.

The motor drive device may further include a control circuit that controls the drive circuit and the switch circuit. The control circuit is configured to switch the switch circuit from the short circuit state to the connection state when the first to third drive currents are zero.
As a result, when switching from the short-circuited state to the connected state, the occurrence of an arc or the like between the first to third output terminals and the switch circuit can be prevented, and the switch circuit can be protected.

  As described above, according to the present invention, a predetermined damper function can be secured even when the power is lost.

It is a block diagram showing roughly the composition of the electromagnetic damper device provided with the motor drive concerning a 1st embodiment of the present invention. It is a schematic block diagram of the drive circuit in the said motor drive device. It is a schematic block diagram of the switch circuit in the said motor drive device. It is a schematic sectional drawing which shows the structure of the motor in the said motor drive device. It is a block diagram showing roughly the composition of the electromagnetic damper device provided with the motor drive concerning a 2nd embodiment of the present invention. It is a control flow performed in the control circuit in the above-mentioned motor drive.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 is a block diagram schematically showing a configuration of an electromagnetic damper device 100 provided with a motor drive device 1 according to a first embodiment of the present invention.

[Motor drive unit]
The motor drive device 1 of the present embodiment includes a drive circuit 20 for driving the motor 10 and a switch circuit 30. The motor drive device 1 further includes a control circuit 40 and a power supply monitoring unit 50.

  The electromagnetic damper device 100 is configured as an electromagnetic suspension device installed on each wheel of the vehicle, and by damping the vibration in the vertical direction of the wheel by the electromagnetic force, the vehicle body can be stably maintained and a passenger can ride comfortably It is intended to provide comfort and stable maneuverability.

  The motor 10 is configured by a linear motor or a rotary motor, and in the present embodiment is configured by a cylindrical linear motor as described later. The motor 10 is formed of a three-phase motor, and has an electromagnetic coil 11 to which three-phase drive current having a phase difference of 120 ° can be supplied. The electromagnetic coil 11 includes a first coil portion 11A to which a first drive current of U phase (first phase) can be supplied, and a second coil current of a V phase (second phase) to which it can be supplied It includes a second coil portion 11B and a third coil portion 11C to which a third drive current of W phase (third phase) can be applied.

  FIG. 2 is a schematic block diagram of the drive circuit 20. As shown in FIG.

  As shown in FIG. 2, the drive circuit 20 is a circuit that drives the motor 10, and is configured of a three-phase inverter circuit connected to a battery E as an external power supply. The drive circuit 20 has switching elements 211, 212, 222, 222, 231, and 232 corresponding to the three-phase coil units 11A, 11B, and 11C of the motor 10, respectively. These switching elements are configured by MOSFETs in the present embodiment.

  The switching elements 211, 212, 221, 222, 231, and 232 are on / off controlled by a control signal from the control circuit 40, whereby a first drive current (U phase) and a second drive current (V phase) are generated. And the third drive current (W phase) are generated. The drive circuit 20 outputs first to third drive currents to the first to third coil portions 11A to 11C of the motor 10 via the switch circuit 30, respectively. It has 24C.

  Although the drive circuit 20 is comprised by an independent circuit about each wheel, it is not restricted to this, You may be comprised by a common circuit about a part of wheels.

  The control circuit 40 is configured by a computer including a CPU, a memory, and the like. The control circuit 40 generates first to third drive currents to be supplied to the respective coil portions of the motor 10 based on the outputs of a plurality of acceleration sensors (not shown) installed under the springs or the springs of the wheels. Control signals to the drive circuit 20.

  More specifically, the control circuit 40 is configured as a logical operation unit that calculates the control amount of the motor 10 so as to suppress the vertical vibration of the vehicle. The calculation method is not particularly limited. For example, an unsprung mass acceleration signal and a sprung mass acceleration signal are input for each wheel, and integration processing and filtering processing are performed on each acceleration signal to determine the unsprung mass speed and the sprung mass speed. A sum of values obtained by multiplying each of the lower speed and the sprung speed by a predetermined gain is calculated as the control amount. This control amount corresponds to the energization control amount to the motor 10, and is calculated independently for each wheel.

  The control circuit 40 further performs on / off control of the switching elements 211, 212, 221, 222, 231, and 232 of the drive circuit 20 with a pulse width corresponding to the control amount. As a result, in the drive circuit 20, first to third drive currents are generated based on the power supply voltage of the battery E. If the generated current from motor 10 is larger than the target energization amount, the regenerative current flows to battery E by the difference, and conversely, if the generated current from motor 10 is smaller than the target energization amount, the difference is the battery The motor 10 is energized from E.

  The battery E is electrically connected to a generator (alternator) not shown, and the battery E is configured to be chargeable by starting the engine not shown.

  FIG. 3 is a schematic block diagram of the switch circuit 30. As shown in FIG.

  The switch circuit 30 is interposed between the motor 10 and the drive circuit 20, and is electrically connected between the motor 10 and the drive circuit 20 in an on state (connection state). It is possible to selectively switch between an off state (short circuit state) which electrically shuts off between the two.

  As shown in FIG. 3, the switch circuit 30 has three fixed contacts 31A, 31B, 31C and three movable contacts 32A, 32B, 32C corresponding to each phase. The fixed contacts 31A to 31C are electrically connected to each other via the short circuit line 33, and the movable contacts 32A to 32C are electrically connected to the first to third coil portions 11A to 11C, respectively.

  When the switch circuit 30 is in the on state, the movable contacts 32A to 32C are respectively connected to the first to third output terminals 24A to 21C as indicated by solid lines in FIG. Thereby, the first to third drive currents are respectively supplied from the drive circuit 20 to the coil portions 11A to 11C of the motor 10.

  On the other hand, when the switch circuit 30 is in the OFF state, the movable contacts 32A to 32C are respectively connected to the fixed contacts 31A to 31C as shown by the two-dot chain line in FIG. Thereby, each coil part 11A-11C of the motor 10 is mutually interrupted | blocked with the drive circuit 20 (output terminal 24A-21C), and mutually connects via the short circuit line 33. As shown in FIG.

  The movable contacts 32A to 32C are typically configured by mechanical switches, electromagnetic switches, and the like. In this case, the output terminal 24A, the fixed contact 31A and the movable contact 32A can be configured by the switch unit SA which is unitized with each other. Similarly, the output terminal 24C, the fixed contact 31B and the movable contact 32B are constituted by the switch portion SB, and the output terminal 21C, the fixed contact 31C and the movable contact 32C are constituted by the switch portion SC, respectively. The switch parts SA to SC may be configured by semiconductor switching elements such as MOSFETs.

  In the present embodiment, the switch circuit 30 is configured to be switched between the on state and the off state based on the output of the power supply monitoring unit 50. The power supply monitoring unit 50 monitors power supply from the battery E to the drive circuit 20, maintains the switch circuit 30 in the on state when power supply is continued, and switches the switch circuit 30 from the on state when power supply is stopped. A first switching signal for switching to the off state is output to the switch circuit 30. Further, when the power supply to the drive circuit 20 is resumed, the power supply monitoring unit 50 is configured to output, to the switch circuit 30, a second switching signal for switching from the off state to the on state.

  Stopping the power supply typically means stopping the power supply due to disconnection of the power supply line connecting the battery E and the drive circuit 20, etc. A state in which the drive circuit 20 can not generate a drive current corresponding to the energization control amount calculated in the control circuit 40, such as a decrease of a predetermined level or more, may be targeted.

  Typically, voltage signals adjusted based on the power supply voltage of the battery E are used for the first and second switching signals output from the power supply monitoring unit 50 to the switch circuit 30.

  Each switch portion SA to SC of the switch circuit 30 is preferably configured by a normally off (B contact) type switch mechanism in which the movable contacts 32A to 32C are biased to the fixed contacts 31A to 31C when no power is supplied. In this case, the power supply monitoring unit 50 can be simply configured by a simple feed line connecting the power supply line and the movable contacts 32A to 32C. The feed line may include an appropriate passive element such as a resistive element or a rectifying element.

  Alternatively, the power supply monitoring unit 50 includes a voltage detection unit that detects the voltage (line voltage) of the power supply line and a comparator that compares the line voltage with the reference voltage, and the switch circuit when the line voltage is lower than the reference voltage The circuit may be configured to shut off the voltage supply to 30. Alternatively, the power supply monitoring unit 50 may be configured as part of the control circuit 40.

[motor]
Subsequently, the details of the motor 10 will be described. FIG. 4 is a schematic cross-sectional view of a cylindrical linear motor showing one configuration example of the motor 10. In the drawing, the X, Y and Z axes indicate directions of three axes orthogonal to each other, and the Z axis corresponds to the axial center direction of the motor 10.

  As shown in FIG. 4, the motor 10 has a fixed portion 110 and a movable portion 120, and is configured as a vehicle damper attached between each wheel of the vehicle and the vehicle body. In the motor 10, for example, the fixed portion 110 is connected to the vehicle body side, and the movable portion 120 is connected to the wheel side. The invention is not limited to this, and the fixed portion 110 may be connected to the wheel side, and the movable portion 120 may be connected to the vehicle body side.

  The fixing portion 110 corresponds to a cylindrical first cylindrical member 111 having a hollow portion 111 a and a plurality of electromagnetic coils 11 arranged inside the first cylindrical member 111 (equivalent to the electromagnetic coil 11 in FIG. 1 and FIG. 3 And. The first cylindrical member 111 has an axis parallel to the Z-axis direction, and holds the electromagnetic coil 11 via a coil holder 112 made of a magnetic material on the inner circumferential surface thereof. One end (upper end in FIG. 4) of the first cylindrical member 111 is open, and the other end (lower end in FIG. 4) is fixed to the base 115 via the adapter 114.

  The movable portion 120 has a second cylindrical member 121 and a shaft 123 (magnetic body portion) that supports the permanent magnet 125. The second cylindrical member 121 has an axis parallel to the Z-axis direction, and is attached to the outer circumferential surface of the first cylindrical member 111 so as to be relatively displaceable in the Z-axis direction with respect to the first cylindrical member 111. One end (the lower end in FIG. 4) of the second cylindrical member 121 is open, and the cover 122 is attached to the other end (the upper end in FIG. 4). The shaft 123 extends inside the first tubular member 111 along the Z-axis direction, and is fixed to the second tubular member 121 via the cover portion 122. One end (upper end in FIG. 4) of the shaft 123 is connected to the vibration receiver 124.

  The detailed configuration of each part of the motor 10 will be described below.

  The first cylindrical member 111 is inserted into the second cylindrical member 121 and abuts on the inner circumferential surface of the second cylindrical member 121. A first slide ring R1 is provided on the outer peripheral surface of the first cylindrical member 111 on the above-mentioned one end side. The first slide ring R1 has an annular shape, and the outer peripheral surface thereof is configured to abut on the inner peripheral surface of the second cylindrical member 121. The first cylindrical member 111 has a function of guiding the sliding in the Z-axis direction with respect to the fixed portion 110 of the movable portion 120.

  The coil holder 112 is formed in a cylindrical shape concentric with the first cylindrical member 111, and is fixed to the inner circumferential surface of the first cylindrical member 111. The coil holder 112 holds the electromagnetic coil 11 composed of a plurality of ring-shaped windings (coil portions 11A to 11C) on the inner peripheral surface side. Each ring-shaped winding is arranged at a predetermined interval along the Z-axis direction, and has an air core portion communicating with the hollow portion 111a.

  The coil units 11A to 11C that constitute the electromagnetic coil 11 are connected to the switch circuit 30. In the present embodiment, each ring-shaped winding is divided into three coil portions 11A to 11C of U phase, V phase and W phase, and coil portions 11A to 11C of each phase are movable contacts 32A to 32 of the switch circuit 30. It is connected to 32C respectively.

  The base portion 115 is supported by the support S on the vehicle body side via the support portion 116. The base portion 115 has a substantially cylindrical shape, the adapter 114 is fixed to one end thereof, and the bottom guide portion 117 is fixed to the other end on the opposite side. The support portions 116 are respectively attached at two positions facing in the X-axis direction on the outer peripheral surface of the base portion 115, and connect the base portion 115 and the support S to each other. In the present embodiment, the support portion 116 is formed of a trunnion that supports the base portion 115 rotatably around the X axis.

  The adapter 114 has an annular shape, is attached to one end (upper end in FIG. 4) of the base portion 115, and connects the base portion 115 and the first cylindrical member 111. The adapter 114 is configured to be able to abut on a flange portion 124A provided so as to project radially outward from the one end of the second cylindrical member 121. The adapter 114 functions as a locking portion that defines the closest position of the movable portion 120 to the base portion 115, and the position where the second cylindrical member 121 abuts on the adapter 114 corresponds to the maximum contraction position of the motor 10 ( See Figure 4).

  The bottom guide portion 117 is a cylindrical member concentric with the first cylindrical member 111, and functions to guide the movement of the movable portion 120 along the Z-axis direction of the stopper 126 attached to the other end of the shaft 123. Have. At one end of the bottom guide portion 117 on the side of the base portion 115, an annular projecting portion 117a that protrudes radially inward so as to be able to abut the stopper 126 is provided. The bottom guide portion 117 functions as a locking portion that defines the maximum separation position of the movable portion 120 with respect to the base portion 115, and the position at which the stopper 126 abuts against the projection 117a of the bottom guide portion 117 is the maximum extension position of the motor 10. It corresponds to

  The second cylindrical member 121 is formed of a cylindrical member concentric with the first cylindrical member 111. A second slide ring R2 is provided at an end of the second cylindrical member 121 in the vicinity of the flange portion 124A. The second slide ring R2 has an annular shape, and the inner peripheral surface thereof is configured to abut on the outer peripheral surface of the first cylindrical member 111.

  In the present embodiment, since the first slide ring R1 in contact with the inner peripheral surface of the second cylindrical member 121 and the second slide ring R2 in contact with the outer peripheral surface of the first cylindrical member 111, the movable portion 120 The relative movement (relative displacement) in the Z-axis direction with respect to the fixed portion 110 of the lens can be stably guided.

  The cover portion 122 closes one end portion of the second cylindrical member 121 and prevents foreign matter and the like from entering the inside (hollow portion 111 a) of the motor 10. A cylindrical holding portion 122a for holding one end of the shaft 123 is provided at the center of the cover portion 122, and the shaft 123 is fixed to the second cylindrical member 121 via the holding portion 122a.

  The stopper 126 is connected to the other end of the shaft 123 and is formed in a disk shape having a peripheral edge portion which can slide on the inner peripheral surface of the bottom guide portion 117. An annular projecting portion 126 a extending in the Z-axis direction toward the cover portion 122 is provided on the peripheral edge portion of the stopper 126, and can abut on the projecting portion 117 a of the bottom guide portion 117 at the maximum extension position of the motor 10 Configured Therefore, the maximum extension position of the motor 10 can be arbitrarily adjusted by the dimension of the protrusion 126 a in the Z-axis direction.

  The shaft 123 is a cylindrical rod-like member whose longitudinal direction is the Z-axis direction, and is inserted into the hollow portion 111 a and penetrates the air core portions of the plurality of ring-shaped windings that constitute the electromagnetic coil 11. The shaft 123 is positioned on the axial center of the first cylindrical member 111 by both ends thereof being held by the cover portion 122 and the stopper 126 respectively. As a result, the shaft 123 can be moved in the Z-axis direction without causing run-out, and furthermore, the durability to offset loads from the direction orthogonal to the Z-axis is ensured.

  The shaft 123 includes a shaft main body 123a, a plurality of cylindrical permanent magnets 125 inserted into the shaft main body 123a, and an annular yoke F interposed between the plurality of permanent magnets 125. The shaft portion main body 123 a penetrates the holding portion 122 a of the cover portion 122 and is connected to the vibration receiving portion 124. The vibration receiver 124 is configured to have an arbitrary structure for transmitting the vibration of a vibration system such as a wheel to the motor 10.

  The plurality of permanent magnets 125 are arranged along the Z-axis direction, and held by the shaft 123 such that the same poles face each other in the Z-axis direction. The type of permanent magnet 125 is not particularly limited, and, for example, an alnico magnet, a ferrite magnet or a neodymium magnet may be employed.

  The size and the number of the permanent magnets 125 are not particularly limited, and can be appropriately set according to the number of ring-shaped windings constituting the electromagnetic coil 11, the arrangement pitch, and the like. Further, in the present embodiment, the permanent magnets 125 are arranged over the range of substantially the entire axial length of the shaft 123, but the permanent magnets 125 are arranged over the range of axial lengths which can pass through the air core of the electromagnetic coil 11 at least. Just do it.

  The position and displacement of the shaft 123 along the Z-axis direction are detected by the detection unit 210. The detection unit 210 is provided at an arbitrary position in the fixed unit 110 (for example, the protrusion 117 a of the bottom guide unit 117), and faces the permanent magnet 125 held by the shaft 123 in the direction orthogonal to the Z-axis direction. . Detection unit 210 detects the magnetic flux density of the magnetic flux from the N pole to the S pole of permanent magnet 125, and outputs a detection signal including relative position information of movable unit 120 (shaft 123) to fixed unit 110 to control circuit 40. .

  The members constituting the fixed portion 110 and the movable portion 120 (the first cylindrical member 111, the second cylindrical member 121, the adapter 114, the base portion 115, the bottom guide portion 117, the cover portion 122, the stopper 126, etc.) It is preferable that it is a metal material from the viewpoint of securing the rigidity and durability of the motor 10.

[Operation of electromagnetic damper device]
Subsequently, a typical operation of the electromagnetic damper device 100 of the present embodiment will be described.

  When the engine (not shown) is started, the drive circuit 20 and the control circuit 40 receive power supply from the battery E, and the switch circuit 30 is switched to the on state shown by a solid line in FIG.

  When each wheel of the traveling vehicle vibrates in the vertical direction, the movable portion 120 (shaft 123) of the motor 10 receives a force acting in the stroke direction (Z-axis direction), and with respect to the fixed portion 110 (electromagnetic coil 11). Relative displacement. The control circuit 40 calculates the energization control amount for the motor 10 for each wheel based on the unsprung mass acceleration signal and the sprung mass acceleration signal of each wheel, and the output of the detection unit 210 of the motor 10, and controls the drive circuit 20 as a control signal. It outputs to each switching element 211, 212, 221, 222, 231, 232.

  Each switching element 211, 212, 221, 222, 231, 232 of the drive circuit 20 is on / off controlled based on a control signal from the control circuit 40, and the electromagnetic coil 11 of the motor 10 (first to third coils The first to third drive currents supplied to the units 11A to 11C) are generated. The generated first to third drive currents are supplied to the electromagnetic coil 11 of the motor 10 through the switch circuit 30 in the on state.

  As described above, when the first to third coil portions 11A to 11C of the electromagnetic coil 11 are controlled to be energized by the first to third drive currents, the motor 10 is optimally damped according to the vibration speed of each wheel. The force is adjusted and variably controlled to be an optimal damping force according to the vibration state of the wheel. Thereby, the improvement of the ride comfort and the steering stability of the vehicle is realized.

  On the other hand, when power supply to drive circuit 20 by battery E is cut off for any reason, power supply monitor 50 performs a first switching operation to switch switch circuit 30 to the off state shown by the two-dot chain line in FIG. A signal is output to the switch circuit 30. Thereby, each movable contact 32A-32C is mutually short-circuited via the short circuit line 33 by being connected to fixed contact 31A-31C.

  Thus, in the motor 10, an induced electromotive force is generated in the electromagnetic coil 11 by electromagnetic induction when the relative displacement of the shaft 123 (permanent magnet 125) with respect to the electromagnetic coil 11 is generated. Since the terminals of the electromagnetic coil 11 are short-circuited in the switch circuit 30 in the off state, a predetermined electromagnetic force that inhibits the movement of the shaft 123 due to the induced current flowing through the coil portions 11A to 11C. Works. Thus, the vibration damping action by the motor 10 is obtained.

  On the other hand, when the power supply of the battery E is restored, the power supply monitoring unit 50 outputs, to the switch circuit 30, a second switching signal for switching the switch circuit 30 to the on state shown by the solid line in FIG. As a result, when power is restored, the switch circuit 30 is automatically returned to the on state, and the above-described expected damping force control can be promptly performed.

  As described above, according to the electromagnetic damper device 100 of the present embodiment, even when the external power supply (battery E) is lost, the switch circuit 30 is switched to the OFF state, whereby the predetermined damper function by the motor 10 is ensured. Ru. As a result, the ride comfort and steering stability of the vehicle can be secured even when the power is lost.

  Moreover, in the OFF state of the switch circuit 30, the connection between each of the coil portions 11A to 11C of the motor 10 and the drive circuit 20 (output terminals 24A to 21C) is cut off, so the current generated by the motor 10 is driven. The leakage current to the circuit 20 can be efficiently used as a generation source of the vibration damping force. In this case, a resistive element having an appropriate electrical resistance value may be interposed in the short circuit line 33, whereby the resistance of the current in the short circuit line 33 can be adjusted, so the vibration damping force by the motor 10 is optimized. be able to.

  Further, according to the present embodiment, since the motor 10 is constituted by a cylindrical linear motor to which linear vibration of the vibration system is directly input, a rotary type provided with a ball screw mechanism for converting linear vibration into rotational motion There is no backlash as compared with the motor of (1), and therefore stable damping action can be obtained even for minute vibrations with small amplitude. Further, since high speed vibration can be sufficiently followed, stable vibration damping characteristics can be obtained even in a relatively high frequency band.

  Furthermore, according to the electromagnetic damper device 100 of the present embodiment, since the trunnion structure is adopted for the support portion 116 of the motor 10, rotation of the motor 10 around the X axis is permitted. As a result, a predetermined vibration damping action can be obtained while tilting around the X axis, so that the electromagnetic damper device 100 suitable for use in a vehicle suspension system can be provided.

Second Embodiment
FIG. 5 is a block diagram schematically showing the configuration of an electromagnetic damper device 200 provided with a motor drive device 2 according to a second embodiment of the present invention. Hereinafter, the configuration different from the first embodiment will be mainly described, and the same configuration as that of the first embodiment is denoted by the same reference numeral, and the description thereof will be omitted or simplified.

  The motor drive device 2 of the present embodiment differs from that of the first embodiment in that the control circuit 41 includes the function of the power supply monitoring unit 50. As in the first embodiment, when the power supply from the battery E to the drive circuit 20 is interrupted, the control circuit 41 is a first circuit for switching from the on state (connection state) to the off state (short circuit state). The switch signal is configured to be output to the switch circuit 30. The control circuit 41 is configured to output, to the switch circuit 30, a second switching signal for switching from the off state to the on state when the power supply to the drive circuit 20 is resumed.

  In particular, in the present embodiment, the control circuit 41 outputs the second switching signal when the first to third drive currents are zero at the time of power restoration, and switches the switch circuit 30 from the off state to the on state. Configured as. Thereby, generation of an arc or the like between the first to third output terminals 24A to 21C and the movable contacts 32A to 32C is prevented at the time of switching from the off state to the on state, and the switch circuit 30 is protected. Can.

  FIG. 6 is a flowchart showing an example of a generation procedure of the second switching signal performed in the control circuit 41.

  When the control circuit 41 detects that the power supply from the battery E to the drive circuit 20 is resumed in the power supply monitoring unit 50, the drive current of each phase of UVW (first to fourth phases) is maintained while the switch circuit 30 is kept off. A preliminary control command for on / off control of each switching element 211, 212, 221, 222, 231, 232 is set so that the third drive current becomes zero (for example, a duty ratio of 50% in PWM control). It is generated and output to the drive circuit 20 (step 101). Subsequently, the control circuit 41 determines whether or not a predetermined time has elapsed since outputting the preliminary control command, and switches the second switching signal for turning on the switch circuit 30 when the predetermined time has elapsed. It outputs to the circuit 30 (steps 102 and 103).

  The predetermined time is not particularly limited, and typically, an appropriate time that can generate a drive current having a current value of zero in each phase after the preliminary control command is output is set, for example, about 0.5 seconds. Ru. As a result, when the switch circuit 30 is switched to the ON state, generation of an arc between the output terminals 24A to 24C and the movable contacts 32A to 32C is prevented, and stable electricity is achieved while the protection between the terminals is achieved. Connection is possible.

  The control circuit 41 may be configured to execute control different from control for switching the switch circuit 30 to the on state after a predetermined time has elapsed from the preliminary control command as described above. For example, a current sensor capable of detecting the drive current of each phase is used, and the switch circuit 30 is switched to the on state when the control circuit 41 detects the drive current zero of each phase based on the outputs of these current sensors. It may be configured.

  As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, of course, a various change can be added.

  For example, although the linear motor shown in FIG. 4 was mentioned as an example and demonstrated as the motor 10 in the above embodiment, it is not restricted to this, A rotation type motor may be employ | adopted.

  Moreover, although the example of an application to the electromagnetic damper apparatus 100 and 200 was demonstrated as the motor drive 1 and 2 in the above embodiment, it is not restricted to this, For example, this invention is also applicable to various actuators provided in the control surface of an aircraft. It is applicable.

1, 2 ... motor drive device 10 ... motor 11 ... electromagnetic coil 11A-11C ... coil section 20 ... drive circuit 24A-24C ... output terminal 30 ... switch circuit 31A-31C ... fixed contact 32A-32C ... movable contact 33 ... short circuit line 40, 41 ... Control circuit 50 ... Power supply monitoring unit 100, 200 ... Electromagnetic damper device 110 ... Fixed unit 111 ... First tube unit 120 ... Movable unit 121 ... Second tube unit 123 ... Shaft 125 ... Permanent magnet E ... Battery SA to SC: Switch part

Claims (4)

A first coil portion to which a first drive current having a first phase can be supplied, and a second coil portion to which a second drive current having a second phase different from the first phase can be supplied A motor drive apparatus for driving a motor including: a third coil portion to which a third drive current having a third phase different from the first and second phases can be supplied,
The first output terminal electrically connectable to the first coil portion, the second output terminal electrically connectable to the second coil portion, and the third coil portion electrically And a third output terminal that can be connected, and generates the first to third drive currents respectively supplied to the first to third coil parts via the first to third output terminals. Driving circuit, and
A connection state in which the first to third output terminals and the first to third coil portions are respectively connected, the first to third output terminals, and the first to third coil portions And a switch circuit interposed between the motor and the drive circuit. The switch circuit is configured to be selectively switchable between a short circuit state in which each of the first to third coil sections are mutually short-circuited. Motor driving device equipped with The motor drive device according to claim 1, wherein
The apparatus further comprises a power supply monitoring unit monitoring power supply to the drive circuit,
The power supply monitoring unit is configured to output, to the switch circuit, a first switching signal for switching the connection state to the short circuit state when power supply to the drive circuit is interrupted. . The motor drive device according to claim 2,
The power supply monitoring unit is configured to output, to the switch circuit, a second switching signal for switching from the short circuit state to the connection state when power supply to the drive circuit is resumed. . The motor drive device according to any one of claims 1 to 3, wherein
And a control circuit for controlling the drive circuit and the switch circuit,
The control circuit is configured to switch the switch circuit from the short circuit state to the connection state when the first to third drive currents are zero.

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