JP6642284B2 - Electric motor drive - Google Patents

Description

  The present invention relates to an electric motor drive device mounted on a vehicle.

  2. Description of the Related Art Various types of electric motor driving devices that drive an electric motor using a motor control unit and control the state of the vehicle using the rotation output of the electric motor are mounted on the vehicle. For example, Patent Document 1 discloses, as an example of an electric motor driving device, an electric active stabilizer system that controls a roll suppressing force during turning of a vehicle.

  The electric active stabilizer system described in Patent Literature 1 includes a three-phase input electric motor incorporated in a stabilizer via an actuator mechanism, and an inverter circuit that converts a control signal into a three-phase drive signal and drives the electric motor. And an electronic control unit (ECU: Electronic Control Unit) that outputs a control signal to the inverter circuit. With these configurations, the electric active stabilizer system changes the rotational output of the electric motor to reduce the roll suppressing force based on a control signal output from the electronic control device in accordance with the situation of the vehicle (steering angle, traveling speed, etc.). Take proper control.

  By the way, for example, when a vehicle completed at a factory is transported by sea or land, some systems such as an electric active stabilizer system perform unnecessary control during transportation so that battery power of the vehicle is not wasted. Therefore, the operation of the system is stopped.

  In particular, in an electric active stabilizer system in which an electric motor is incorporated in a stabilizer, when an input is applied to the stabilizer due to, for example, lateral vibration of a vehicle body generated during transportation, the electric motor incorporated in the stabilizer may be rotated. In this case, the electric motor operates as a generator, and back electromotive force is generated in the electric motor. The back electromotive force generated in the electric motor may have adverse effects such as damage to a switching element included in the inverter circuit and back flow of the electromotive current to the battery power supply.

JP 2007-195331 A

  In the conventional electric active stabilizer system described in Patent Document 1, in order to prevent the inverter circuit from being adversely affected, a back electromotive force generated in the electric motor due to an external input such as an input to the stabilizer due to vehicle body vibration. Is consumed using a complicated and large-scale dedicated protection circuit.

  However, the above-mentioned conventional electric active stabilizer system requires a dedicated protection circuit for suppressing the back electromotive force generated in the electric motor. There is a problem that the cost increases.

  The present invention has been made in view of the above-described problems, and an electric motor capable of suppressing generation of back electromotive force in an electric motor without using a complicated, large-scale, and high-cost dedicated protection circuit. It is an object to provide a driving device.

In order to solve the above problems, the present invention is an electric motor driving device mounted on a vehicle, comprising: a multi-phase electric motor; a motor control unit that drives the electric motor; and an electric motor and a motor control unit. One-phase wiring is provided on at least one-phase wiring among a plurality of wirings to be connected, and when a fuse used for a power supply wiring of a vehicle is mounted at a predetermined position in the unit, the motor control unit is not operated. And an auxiliary unit in which a path for electrically grounding is provided.

  In the present invention, an auxiliary unit capable of electrically grounding (connecting to GND) via a fuse when a fuse is mounted is provided on at least one-phase wiring (input terminal) of the electric motor. Thus, when the auxiliary unit functions by mounting the fuse, a path is formed in which the at least one phase wiring is connected to the other phase wiring via GND. By this route, the back electromotive force generated by the electric motor can be consumed by the electric motor itself, so that the brake is applied to the electric motor to suppress the rotation.

  Therefore, when the electric motor driving device is not operated, for example, during transportation without using a vehicle, by attaching a fuse and making the auxiliary unit function, generation of a back electromotive force (electric motor) in the electric motor caused by an external input is performed. Rotation of the motor) can be suppressed. On the other hand, when the electric motor driving device is operated, for example, when the vehicle is normally used, the electric motor can be normally driven by the motor control unit by not operating the auxiliary unit without mounting the fuse.

  Since this auxiliary unit can be realized by a simple configuration such as connection to GND via a fuse holder, for example, the motor control unit does not become complicated or large.

  Further, as a scene in which the auxiliary unit functions by mounting a fuse, a scene in which the electric motor driving device is not operated, for example, during transportation of a vehicle, is assumed. Therefore, in such a situation, as a fuse to be attached to the auxiliary unit, for example, it is usually used for the power supply wiring of the vehicle, but the power supply wiring of the vehicle is used for the purpose of preventing unnecessary consumption of the battery power supply during transportation of the vehicle. The fuse temporarily removed from the fuse can be used.

  Therefore, by diverting the fuse that is temporarily removed from the power supply wiring of the vehicle when the vehicle is transported, the cost of the auxiliary unit, that is, the cost of the entire electric motor drive device can be reduced.

  Further, the auxiliary unit is configured to electrically connect at least one-phase wiring (input terminal) of the electric motor to GND. Therefore, for example, it is easy to forget to remove the fuse from the auxiliary unit simply by passing a small current from the motor drive unit to each phase of the electric motor and checking whether the potential of each phase is at the ground level (0 V). You can check.

  According to the above-described electric motor driving device of the present invention, generation of back electromotive force in the electric motor can be suppressed without using a complicated, large-scale, and expensive dedicated protection circuit.

FIG. 1 is a diagram illustrating a circuit configuration of an electric motor driving device according to an embodiment of the present invention. The figure explaining an example of the scene which operates the electric motor drive device of this embodiment. FIG. 4 is a view for explaining an example of a scene in which the electric motor drive device of the embodiment is not operated.

[Overview]
The electric motor drive device of the present invention is provided with an auxiliary circuit that can electrically ground the wiring if a fuse is mounted on at least one phase wiring of the electric motor. Therefore, when the electric motor driving device is not operated, the generation of the back electromotive force due to, for example, an external input to the electric motor can be suppressed by attaching the fuse and making the auxiliary circuit function.

[Configuration of electric motor drive device]
FIG. 1 is a diagram conceptually showing a configuration of an electric motor driving device 1 according to one embodiment of the present invention. 1, the electric motor driving device 1 includes a motor control unit 10, an actuator unit (hereinafter, referred to as an “ACT unit”) 20, and an auxiliary unit 30.

  The ACT unit 20 includes a multi-phase electric motor 21 in its configuration, and is configured to be able to change the state of a predetermined device (not shown) of the vehicle based on the rotation output of the electric motor 21. The multi-phase electric motor 21 can be, for example, a three-phase DC brushless motor. The electric motor 21 is connected to a predetermined device of the vehicle via an actuator mechanism (not shown), and is configured to be able to provide an output to the predetermined device of the vehicle.

  For example, when the electric motor driving device 1 is the electric active stabilizer system described in the related art, the electric motor 21 is incorporated in a stabilizer (corresponding to a predetermined device) via an actuator mechanism (not shown). Becomes

  The motor control unit 10 is a device having a function of controlling and driving the electric motor 21 of the ACT unit 20. The motor control unit 10 includes an inverter control circuit 11 and an inverter circuit 12 in its configuration.

  The inverter circuit 12 includes six switching elements SW1 to SW6. As the switching elements SW1 to SW6, a MOS (metal oxide semiconductor) transistor, an IGBT (insulated gate bipolar transistor), or the like can be used. In the present embodiment, as shown in FIG. 1, an example is shown in which an element in which an N-channel MOS transistor and a free wheel diode are connected in anti-parallel is used for each of the six switching elements SW1 to SW6.

  In the inverter circuit 12, a three-phase bridge circuit is configured by six switching elements SW1 to SW6. Specifically, the switching elements SW1 to SW6 are divided into three pairs of switching elements (SW1 and SW4, SW2 and SW5, SW3 and SW6) corresponding to each phase of the electric motor 21. In each set of switching element pairs, the elements are connected in series and inserted between a power supply + B and a ground point GND. A connection point between the source terminal S and the drain terminal D in each switching element pair is connected to an input terminal of any one phase of the electric motor 21.

  With the configuration of the three-phase bridge circuit described above, each of the switching elements SW1 to SW6 performs complementary ON / OFF operations based on control signals individually applied to each gate terminal G by the inverter control circuit 11 described later. Thus, a three-phase drive signal can be output to the electric motor 21.

  The inverter control circuit 11 outputs a control signal to the inverter circuit 12 in order to appropriately drive the electric motor 21 according to the state of the vehicle detected inside the own circuit or given from the outside of the own circuit. The control signal is a signal for causing the switching elements SW1 to SW6 to perform complementary on / off operations such that the inverter circuit 12 generates a three-phase drive signal having a phase difference of 120 degrees between phases. It is. The control signal is individually applied to each gate terminal G of the six switching elements SW1 to SW6.

  Note that all or a part of the inverter control circuit 11 is typically configured as an electronic control unit (ECU) including a central processing unit (CPU), a memory, and an input / output interface. The CPU reads out the stored program, interprets and executes the program, thereby realizing a predetermined function.

  The auxiliary unit 30 has a structure in which electrical conduction / interruption can be switched by the presence or absence of the fuse 31. The auxiliary unit 30 is provided between an input terminal of any one phase of the electric motor 21 and a ground point GND. I have. Such a structure can be realized by, for example, inserting a fuse holder to which the fuse 31 can be attached and detached between the input terminal and the ground point GND.

  When the fuse 31 is present (for example, attached to a fuse holder), the auxiliary unit 30 electrically connects any one-phase wiring (input terminal) of the electric motor 21 to the ground point GND to be electrically grounded. Let it. On the other hand, when there is no fuse 31 (for example, the fuse 31 is removed from the fuse holder), the auxiliary unit 30 electrically disconnects any one-phase wiring (input terminal) of the electric motor 21 from the ground point GND.

[Attached state of fuse in auxiliary unit]
The attachment of the fuse 31 in the auxiliary unit 30 will be described with reference to FIGS. 2A and 2B.

  In the present invention, the mounting state of the fuse 31 in the auxiliary unit 30 is changed as follows in a case where the electric motor driving device 1 is operated and a case where the electric motor driving device 1 is not operated.

(1) Scene where the electric motor drive device 1 is operated (FIG. 2A)
The scene in which the electric motor driving device 1 is operated is a scene in which a control signal is output from the inverter control circuit 11 to the inverter circuit 12 and the electric motor 21 is driven by the inverter circuit 12 that operates based on the control signal. For example, a scene in which the vehicle is normally used such as running the vehicle corresponds to a scene in which the electric motor driving device 1 is operated. In such a situation, the auxiliary unit 30 is in a state where the fuse 31 is not mounted in order to prevent the auxiliary unit 30 from functioning. Further, in the electric system of the vehicle, power is supplied from a battery power supply 50 to each device (not shown) of the vehicle via power supply wiring.

  When the fuse 31 is not mounted on the auxiliary unit 30, any one-phase input terminal of the electric motor 21 provided with the auxiliary unit 30 is non-conductive to the ground point GND. Therefore, the electric motor driving device 1 can normally drive the electric motor 21 of the ACT unit 20 by the motor control unit 10.

(2) Scene where the electric motor driving device 1 is not operated (FIG. 2B)
The case where the electric motor driving device 1 is not operated is a case where no control signal is output from the inverter control circuit 11 to the inverter circuit 12 and the electric motor 21 is not driven by the inverter circuit 12. For example, a scene during transportation without using a vehicle corresponds to a scene in which the electric motor driving device 1 is not operated. In such a situation, in order to make the auxiliary unit 30 function, the auxiliary unit 30 is in a state where the fuse 31 is mounted.

  In particular, in the case of a scene during transportation without using a vehicle, as shown in FIG. 2B, it is usually used for power supply wiring of the vehicle, but during transportation of the vehicle, unnecessary consumption of the battery power supply 50 is prevented. A fuse temporarily removed from the power supply wiring of the vehicle for the purpose can be used for the fuse 31 of the auxiliary unit 30. Therefore, when the fuse is diverted as described above, it is possible to suppress an increase in the cost of the electric motor driving device 1.

  In this state, any one-phase input terminal of the electric motor 21 provided with the auxiliary unit 30 is electrically connected to the ground point GND. Therefore, in the electric motor driving device 1, a path is formed in which at least one phase wiring (input terminal) of the electric motor 21 is connected to the other phase wiring via the ground point GND. See FIG. More specifically, the ground GND connected to the fuse 31 is also connected to the ground GND of the inverter circuit 12. The ground point GND of the inverter circuit 12 is connected to the other phase wiring (input terminal) of the electric motor 21 through the return diode of the switching element SW4 or SW5.

  By forming the above-described path, the energy of the back electromotive force generated in the electric motor 21 can be consumed by the electric motor 21 itself. This energy consumption acts in a direction in which a brake torque is applied to the electric motor 21, and the rotation of the electric motor 21 is suppressed. As a result, generation of back electromotive force in the electric motor 21 due to an external input, that is, rotation of the electric motor 21 can be suppressed.

[How to check auxiliary unit]
In the present electric motor drive device 1, the state of the fuse holder is visually checked to determine whether the fuse 31 attached to the auxiliary unit 30 has been removed during transportation of the vehicle or the like during normal use of the vehicle. Can be easily checked.

  In addition to the method of visually confirming the state of the fuse holder, it is also possible to check whether or not the fuse 31 is mounted, for example, by performing an electrical simple test as described below.

  The auxiliary unit 30 of the present embodiment has a configuration in which at least one-phase wiring (input terminal) of the electric motor 21 is electrically connected to the ground point GND. For this reason, if the electric potential of each phase of the electric motor 21 is not at the ground level (0 V), it can be determined that the fuse 31 is not mounted on the auxiliary unit 30, and any one of the electric units is at the ground level (0 V). If so, it can be determined that the fuse 31 is mounted on the auxiliary unit 30.

  For this reason, for example, a small current is passed from the motor control unit 10 to each phase of the electric motor 21 to check whether the potential of each phase is at the ground level (0 V). It is possible to easily check the mounting state of the fuse 31, that is, whether the user has forgotten to remove the fuse 31.

[Operation and Effect in the Present Embodiment]
According to the electric motor driving device 1 according to the embodiment of the present invention, when the fuse 31 is mounted, the auxiliary unit 30 that can electrically connect the wiring to the ground point GND via the fuse 31, that is, the groundable auxiliary unit 30 is provided. It is provided on at least one-phase wiring (input terminal) of the electric motor 21. Accordingly, when the fuse 31 is mounted and the auxiliary unit 30 functions, a path is formed in which the at least one-phase wiring is connected to the other-phase wiring via the ground point GND. By this route, the back electromotive force generated by the electric motor 21 can be consumed by the electric motor itself, so that a brake torque is applied to the electric motor 21 to suppress rotation.

  Therefore, in a situation where the electric motor driving device 1 is not operated, for example, during transportation without using a vehicle, the back electromotive force in the electric motor 21 caused by an external input is caused by attaching the fuse 31 and making the auxiliary unit 30 function. , That is, rotation of the electric motor 21 can be suppressed. On the other hand, when the electric motor driving device 1 is operated, for example, when the vehicle is normally used by running the vehicle, the auxiliary unit 30 is not operated without the fuse 31 attached, so that the motor control unit 10 The electric motor 21 can be driven normally.

  The auxiliary unit 30 can be realized with a simple configuration such as connecting to the ground point GND via a fuse holder, so that the motor control unit 10 does not become complicated or large.

  Further, as a scene in which the fuse 31 is attached and the auxiliary unit 30 functions, it is assumed that the electric motor driving device 1 is not operated, for example, during transportation of a vehicle. Therefore, in such a case, the fuse 31 to be attached to the auxiliary unit 30 is usually used, for example, for power supply wiring of the vehicle, but is used for the purpose of preventing unnecessary consumption of the battery power supply 50 during transportation of the vehicle. Fuses that are temporarily removed from the power supply wiring of the vehicle, that is, not used when the vehicle is transported, can be used.

  Therefore, the fuse that is temporarily removed from the power supply wiring of the vehicle and is not used when the vehicle is transported and is not used is diverted to the fuse 31 attached to the auxiliary unit 30, thereby reducing the cost of the auxiliary unit 30, that is, the electric motor driving device. 1 The overall cost can be reduced.

Further, the auxiliary unit 30 is configured to electrically connect at least one-phase wiring (input terminal) of the electric motor 21 to the ground point GND. Therefore, for example, a small current is passed from the motor control unit 10 to each phase of the electric motor 21 to check whether the potential of each phase is at the ground level (0 V). That is, it is possible to easily check whether the fuse 31 has been forgotten to be removed.

  In the above embodiment, the electric motor driving device mounted on the vehicle has been described. However, the electric motor driving device of the present invention can be used for various systems using the rotation output of the electric motor, and can be mounted on a device other than the vehicle.

  INDUSTRIAL APPLICABILITY The electric motor driving device according to the present invention can be used for a system in which a back electromotive force caused by an external input is generated in an electric motor when the system is not operating, such as an electric active stabilizer system.

1 electric motor drive device 10 motor control unit 11 inverter control circuit (ECU)
12 Inverter circuit 20 Actuator unit (ACT unit)
21 electric motor 30 auxiliary unit 31 fuse 50 battery power supply

Claims (1)

An electric motor drive device mounted on a vehicle,
A multi-phase electric motor,
A motor control unit that drives the electric motor;
When a predetermined fuse, which is provided in at least one phase wiring among a plurality of wirings connecting the electric motor and the motor control unit and is used for a power supply wiring of a vehicle, is mounted at a predetermined position in the unit , An auxiliary unit formed with a path for electrically grounding the one-phase wiring without operating the motor control unit .
Electric motor drive.

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