Motor unit and motor control system

Abstract

The present application relates to a motor unit and a motor control system. The motor unit includes a first motor that drives a vehicle, and a second motor that drives an auxiliary machine of the first motor, and includes a first inverter that controls the first motor based on a control signal transmitted from a main control device of the vehicle, and a second inverter that controls the second motor based on a drive command signal for controlling the second motor transmitted from the first inverter, the second inverter transitioning to an operation state in which consumption power of the second inverter is suppressed when reception of the drive command signal has ended.

Description

Technical Field

[0001] This invention relates to motor units and motor control systems.

[0002] This application claims priority based on Japanese Patent Application No. 2019-207345, filed on November 15, 2019, the contents of which are incorporated herein by reference. Background Technology

[0003] As environmentally conscious vehicles have become increasingly popular in recent years, electric vehicles and hybrid vehicles, which use motor units as their drive source, are becoming more widespread. These electric vehicles are equipped with inverters that convert DC power from the battery into AC power supplied to the motor and control the drive torque to accelerate and decelerate the vehicle.

[0004] Patent Document 1 describes a motor unit comprising a motor for driving a vehicle, an inverter unit for controlling the motor unit, and auxiliary equipment such as a pump for cooling the motor. It is known that during vehicle stoppage and when the vehicle power is disconnected, the driving motor and the inverter controlling the auxiliary equipment generate dark current (Patent Document 2). Dark current refers to the power consumed by the control system that controls the electric motor when the vehicle power is disconnected. Conventionally, in the motor unit shown in Patent Document 1, to reduce the load, a second inverter is configured separately from the inverter controlling the motor unit; this second inverter controls the auxiliary equipment such as the pump.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2019 / 131454

[0008] Patent Document 2: Japanese Patent Application Publication No. 10-271603 Summary of the Invention

[0009] The technical problem that the invention aims to solve

[0010] However, in the motor unit shown in Patent Document 1, power is supplied to the first inverter and the second inverter independently from the battery, which makes it difficult to control the second inverter when the vehicle is parked or stopped. Therefore, the present invention was developed in view of the above situation, and the object of the present invention is to provide a motor unit that can suppress dark current flowing when the power is disconnected and can accurately control the vehicle.

[0011] Technical solutions adopted to solve technical problems

[0012] The motor unit of the first aspect of the present invention includes: a first motor that drives a vehicle; and a second motor that drives an auxiliary machine of the first motor, and the motor unit includes: a first inverter that controls the first motor based on a control signal sent from a main control device of the vehicle; and a second inverter that controls the second motor based on a drive command signal sent from the first inverter for controlling the second motor, wherein the second inverter switches to an operating state that suppresses the power consumption of the second inverter after the reception of the drive command signal ends.

[0013] The second aspect of the present invention provides a motor control system that controls a first motor and a second motor, wherein the first motor drives a vehicle and the second motor drives an auxiliary motor of the first motor. The motor control system includes: a first inverter that controls the first motor based on a control signal sent from the vehicle's main control unit; and a second inverter that controls the second motor based on a drive command signal sent from the first inverter for controlling the second motor. The second inverter then transitions to an operation state that suppresses power consumption of the second inverter once the reception of the drive command signal has ended.

[0014] Invention Effects

[0015] The motor unit of the present invention can suppress dark current flowing when the power supply to the inverter that controls the motor driving the auxiliary machine is disconnected, and can accurately control the vehicle. Attached Figure Description

[0016] Figure 1 This is a diagram schematically illustrating an example of the structure of motor unit 1.

[0017] Figure 2 This is a schematic diagram illustrating an example of the block structure of the pump inverter 220.

[0018] Figure 3 This is a diagram illustrating an example of the operating flow of the drive inverter 120.

[0019] Figure 4 This is a diagram illustrating an example of the operating flow of a pump inverter 220.

[0020] Figure 5 This is a diagram illustrating one example of the various changes that accompany the on / off state of the ignition switch 5.

[0021] Figure 6 This is a diagram that schematically illustrates an example of the structure of a motor unit. Detailed Implementation

[0022] The present invention will now be described through embodiments thereof; however, these embodiments are not intended to limit the invention as defined in the claims. Not all combinations of features described in the embodiments are necessary for the solution of the invention.

[0023] Figure 1 An example of the structure of motor unit 1 is schematically shown. Figure 1 In the diagram, solid lines connecting the various structures represent power lines. Figure 1 In the diagram, the dotted lines connecting the various structures represent signal lines.

[0024] Motor unit 1 includes a drive motor 110, a drive inverter 120, an electric oil pump 200, and an electric actuator 300. The drive motor 110 is an example of a "first motor." The drive inverter 120 is an example of a "first inverter." The electric oil pump 200 and the electric actuator 300 are examples of "auxiliaries to the first motor."

[0025] The drive motor 110 is the motor that drives the electric vehicle. An electric vehicle is a car that uses electricity as its power source and the drive motor 110 as its electric power source to move. In this embodiment, a rechargeable battery electric vehicle will be described as an example. In this type of electric vehicle, a plug is connected to the vehicle body, and a rechargeable battery is used as the power source. The electricity from the rechargeable battery powers the drive motor 110 to rotate, thus driving the vehicle. Furthermore, an electric vehicle is an example of a "vehicle".

[0026] The drive inverter 120 is an inverter that controls the drive motor 110 based on control signals sent from the vehicle control unit 2 of the electric vehicle. The drive inverter 120 receives control signals from the vehicle control unit 2 via the CAN (Controller Area Network) bus. The vehicle control unit 2 is the unit that controls the entire electric vehicle. For example, when the vehicle control unit 2 receives an ignition signal from the ignition switch 5 via signal line 7, it sends an ignition signal to the drive inverter 120 via the CAN bus 6. The ignition switch 5 is a device used to start the drive motor 110. Furthermore, the drive inverter 120 converts the DC power supplied from the high-voltage battery 3 to AC power and controls the rotation of the drive motor 110. Additionally, the vehicle control unit 2 is an example of a "main control unit of the vehicle."

[0027] The electric oil pump 200 is an oil pump that operates using a motor. The electric oil pump 200 includes a pump motor 210 and a pump inverter 220. Furthermore, the pump motor 210 is an example of a "second motor." The pump inverter 220 is an example of a "second inverter."

[0028] Pump motor 210 is the motor that drives electric oil pump 200.

[0029] The pump inverter 220 controls the pump motor 210 based on drive command signals sent from the drive inverter 120 to control the pump motor 210. The pump inverter 220 receives the drive command signals from the drive inverter 120 via a signal line 8 different from the CAN bus 6. Furthermore, the pump inverter 220 converts the DC power supplied from the 12V battery 4 via the drive inverter 120 into AC power and controls the rotation of the pump motor 210.

[0030] The electric actuator 300 is an electric actuator that actuates the parking lock mechanism. The electric actuator 300 includes an actuator motor 310 and an actuator inverter 320. Furthermore, the actuator motor 310 is an example of a "second motor." The actuator inverter 320 is an example of a "second inverter."

[0031] Actuator motor 310 is the motor that drives electric actuator 300.

[0032] The actuator inverter 320 controls the actuator motor 310 based on drive command signals sent from the drive inverter 120 for controlling the actuator motor 310. The actuator inverter 320 receives the drive command signals from the drive inverter 120 via a signal line 9 different from the CAN bus 6. Furthermore, the actuator inverter 320 converts the DC power supplied from the 12V battery 4 via the drive inverter 120 into AC power and controls the rotation of the actuator motor 310.

[0033] In addition, the drive inverter 120, the pump inverter 220, and the actuator inverter 320 are examples of a "motor control system".

[0034] Here, the drive inverter 120 can perform control to suppress dark current at appropriate times based on the control signal sent from the vehicle control unit 2 via the CAN bus 6.

[0035] On the other hand, the pump inverter 220 and the actuator inverter 320 are not connected to the CAN bus 6, so they cannot perform control for suppressing dark current based on the control signals sent from the vehicle control unit 2.

[0036] Therefore, once the reception of the drive command signal sent from the drive inverter 120 has ended, the pump inverter 220 transitions to an operating state that stops a portion of the circuitry to suppress the power consumption of the pump inverter 220. Here, this portion of the circuitry includes, for example, the circuitry driving the pump motor 210. Figure 2The motor drive unit 221 shown, and the microcomputer that generates the PWM signal to drive the pump motor 210 and make it rotate ( Figure 2 The control unit 222 shown is an example. Similarly, when the reception of the drive command signal sent from the drive inverter 120 ends, the actuator inverter 320 switches to an operating state that stops a portion of the circuit to suppress the power consumption of the actuator inverter 320.

[0037] Figure 2 An example of the block structure of a pump inverter 220 is schematically shown. The pump inverter 220 includes a motor drive unit 221, a control unit 222, a signal detection unit 223, and a circuit switching unit 224.

[0038] The motor drive unit 221 is a circuit that drives the pump motor 210. The motor drive unit 221 converts the DC power supplied by the drive inverter 120 into three-phase AC power according to the frequency of the PWM signal output from the control unit 222, and outputs it to the pump motor 210.

[0039] The control unit 222 is a microcomputer that controls the motor drive unit 221. The control unit 222 generates a PWM signal that drives the pump motor 210 to rotate at a frequency based on the PWM (pulse width modulation) frequency of the drive command signal sent from the drive inverter 120. Furthermore, the control unit 222 outputs the generated PWM signal to the motor drive unit 221.

[0040] The signal detection unit 223 is a circuit that detects the presence or absence of a drive command signal. A 5V power supply is provided to the signal detection unit 223 via a step-down switching regulator (not shown) located upstream of the circuit switch 224. Therefore, the signal detection unit 223 can operate even when the circuit switch 224 is open.

[0041] The circuit switching section 224 is a switching circuit that switches the circuit that supplies power to the motor drive section 221 and the control section 222 to be connected or disconnected.

[0042] In addition, the inverter 320 for actuators includes the same block structure as the inverter 220 for pumps.

[0043] Figure 3 An example of the operation flow of the drive inverter 120 is shown. Figure 3 The processing flow is shown from the start to the end of the drive command signal for the pump inverter 220.

[0044] The drive inverter 120 reads the control signals sent from the vehicle control unit 2 via the CAN bus 6 at predetermined intervals (step S101).

[0045] If a control signal indicating ignition is activated is read in step S101 (step S102: No), the drive inverter 120 sends a drive command signal (step S103), and the process ends. Figure 3 The process is shown. For example, when step S103 is executed without sending a drive command signal, the drive inverter 120 starts sending the drive command signal. Figure 5 (Time T1). For example, when the process of step S103 is performed while the drive command signal is being sent, the drive inverter 120 keeps the transmission of the drive command signal continuous ( Figure 5 (The period from time T1 to time T3).

[0046] If the pump inverter 220 receives a drive command signal, it will drive the pump motor 210.

[0047] On the other hand, if a control signal indicating ignition disconnection is read in step S101 (step S103: Yes), the drive inverter 120 starts operating and is then controlled (step S104). Figure 5 (Time T3). In step S104, the drive inverter 120 is set to a timer for measuring a predetermined time until the transmission of the drive command signal stops.

[0048] After step S104, the drive inverter 120 refers to the value of the timer and remains in standby mode until a predetermined time has elapsed (step S105: No). The drive inverter 120 also continues to send drive command signals during the post-operation control period. Figure 5 (during the period from time T3 to time T4).

[0049] Furthermore, if a predetermined time has elapsed after step S104 (step S105: Yes), the drive inverter 120 stops operating and is controlled (step S106), thus ending the process. Figure 3 The process is shown. In step S106, the drive inverter 120 ends the transmission of the drive command signal. Figure 5 (Time T4).

[0050] If the pump inverter 220 does not receive a drive command signal, the pump motor 210 will not be driven.

[0051] Figure 4 An example of the operation flow of the pump inverter 220 is shown. Figure 4 The process flow of the circuit switching unit 224 from switching to on to switching to off is shown. This process is executed by detecting whether a drive command signal is received.

[0052] When the signal detection unit 223 detects the drive command signal (step S201: Yes), the circuit switching unit 224 becomes connected (step S202). Figure 5 (The period from time T2 to time T4).

[0053] On the other hand, when the signal detection unit 223 does not detect a drive command signal (step S201: No), the circuit switching unit 224 becomes open (step S203).

[0054] Therefore, when the signal detection unit 223 detects that the reception of the drive command signal has started, the circuit switching unit 224 switches from disconnected to connected. Figure 5 (At time T1). The circuit switching unit 224 switches from on to off when the signal detection unit 223 detects that the reception of the drive command signal has ended. Alternatively, the circuit switching unit 224 can immediately turn off when the signal detection unit 223 detects that the reception of the drive command signal has ended, or it can turn off after a predetermined time. When the circuit switching unit 224 is configured to immediately turn off, the state of suppressing dark current in the pump inverter 220 can be maintained for a longer period. On the other hand, when the circuit switching unit 224 is configured to turn off after a predetermined time, the period during which the control unit 222 performs the processing for transitioning to the sleep state can be ensured.

[0055] Figure 5 This illustrates one example of the various changes that accompany the on / off state of the ignition switch 5. Figure 5 In this example, the circuit switching unit 224 will disconnect after a predetermined time has elapsed when the signal detection unit 223 detects that the reception of the drive command signal has ended.

[0056] When the ignition switch 5 is off, the drive inverter 120 does not send a drive command signal. In the pump inverter 220, the signal detection unit 223 does not detect a drive command signal, therefore the circuit switching unit 224 is off, and no power is supplied to the motor drive unit 221 and the control unit 222. The control unit 222 is in an off state because no power is supplied. Therefore, the pump motor 210 stops. At this time, the power consumed in the pump inverter 220 is the power consumed by the operation of the signal detection unit 223, and is, for example, in the form of several μA.

[0057] When the ignition switch 5 changes from off to on (time T1), the drive inverter 120 starts sending the drive command signal. In the pump inverter 220, the signal detection unit 223 detects that the reception of the drive command signal has started, the circuit switching unit 224 turns on, and power supply to the motor drive unit 221 and the control unit 222 begins. By supplying power, the control unit 222 becomes operational, but there is a predetermined time before the processing to generate the PWM signal begins. Therefore, the pump motor 210 stops. At this time, the power consumption in the pump inverter 220 increases by the power consumption generated by the operation of the control unit 222, which does not control the pump motor 210, by a factor of, for example, several mA.

[0058] When the ignition switch 5 is turned on and a predetermined time has elapsed (time T2), the control unit 222 initiates the processing to generate a PWM signal. Therefore, the pump motor 210 is driven under control. At this time, the power consumption in the pump inverter 220 increases by the power consumption generated by the operation of the pump motor 210 driven by the motor drive unit 221, for example, to the extent expressed in amperes (A).

[0059] When the ignition switch 5 changes from on to off (time T3), the drive inverter 120 starts the operation control.

[0060] When the post-operation control begins and a predetermined time has elapsed (time T4), the drive inverter 120 terminates the post-operation control and stops sending the drive command signal. In the pump inverter 220, the signal detection unit 223 detects that the reception of the drive command signal has ended, but a predetermined time elapses until the circuit switching unit 224 becomes open. The control unit 222 remains in an on-state capable of operation until the predetermined time has elapsed, but since the reception of the drive command signal has ended, the processing of generating the PWM signal ends. Therefore, the pump motor 210 stops. At this time, since the motor drive unit 221 has stopped driving the pump motor 210, the power consumption in the pump inverter 220 becomes, for example, a level expressed in several mA.

[0061] When the transmission of the drive command signal ends and a predetermined time has elapsed (time T5), the circuit switching section 224 in the pump inverter 220 becomes open, and the power supply to the motor drive section 221 and the control section 222 ends. The control section 222 is in an open state and cannot operate due to the lack of power supply. At this time, since the control section 222 has stopped operating, the power consumption in the pump inverter 220 becomes, for example, in the form of several μA.

[0062] As explained above, in this embodiment, the pump inverter 220 switches to an operating state where the control unit 222 stops to suppress the power consumption of the pump inverter 220 after the reception of the drive command signal sent from the drive inverter 120 ends. Therefore, according to this embodiment, the dark current of the pump inverter 220, which controls the pump motor 210 that drives the electric oil pump 200, can be suppressed.

[0063] In addition, the inverter 320 for the actuator of the electric actuator also performs the same operation as the inverter 220 for the pump of the electric oil pump 200.

[0064] Hereinafter, features of the present invention will be described. The motor unit 1 of this embodiment includes a drive motor 110 for driving an electric vehicle. The motor unit 1 includes a pump motor 210 for driving an electric oil pump 200. The motor unit 1 includes an actuator motor 310 for driving an electric actuator 300. The motor unit 1 includes a drive inverter 120 for controlling the drive motor 110 based on control signals sent from the vehicle control unit 2 of the electric vehicle. The motor unit 1 includes a pump inverter 220 for controlling the pump motor 210 based on drive command signals sent from the drive inverter 120. The motor unit 1 includes an actuator inverter 320 for controlling the actuator motor 310 based on drive command signals sent from the drive inverter 120. Furthermore, when the reception of the drive command signal has ended, the pump inverter 220 switches to an operating state that suppresses the power consumption of the pump inverter 220. Similarly, when the reception of the drive command signal has ended, the actuator inverter 320 switches to an operating state that suppresses the power consumption of the actuator inverter 320.

[0065] In this embodiment, the inverter 120 for driving the motor unit 1 terminates the transmission of drive command signals based on the control signals sent from the vehicle control unit 2.

[0066] In this embodiment, the inverter 120 for driving the motor unit 1 terminates the transmission of the drive command signal after a predetermined time, based on the control signal sent from the vehicle control unit 2.

[0067] The pump inverter 220 in the motor unit 1 of this embodiment includes a motor drive unit 221 that drives the pump motor 210. The pump inverter 220 includes a control unit 222 that controls the motor drive unit 221. The pump inverter 220 includes a signal detection unit 223 that detects whether a drive command signal is received. The pump inverter 220 includes a circuit switching unit 224 that switches the circuit supplying power to the motor drive unit 221 and the control unit 222.

[0068] In this embodiment, the circuit switching unit 224 in the motor unit 1 switches from on to off when the signal detection unit 223 detects that the reception of the drive command signal has ended.

[0069] In this embodiment, the circuit switching section 224 in the motor unit 1 becomes disconnected after the drive command signal reception ends and a predetermined time has elapsed.

[0070] Similarly, the actuator inverter 320 in the motor unit 1 of this embodiment includes a motor drive unit for driving the actuator motor. The actuator inverter 320 includes a control unit for controlling the motor drive unit. The actuator inverter 320 includes a signal detection unit for detecting whether a drive command signal is received. The actuator inverter 320 includes a circuit switching unit for switching the circuit supplying power to the motor drive unit and the control unit on and off.

[0071] In this embodiment, the circuit switching section of the actuator inverter 320 in the motor unit 1 switches from on to off when the signal detection section detects that the transmission of the drive command signal has ended.

[0072] In this embodiment, the circuit switching part of the actuator inverter 320 in the motor unit 1 becomes disconnected after the transmission of the drive command signal ends and a predetermined time has elapsed.

[0073] The motor control system 10 of this embodiment is a system for controlling a drive motor 110, a pump motor 210, and an actuator motor 310. The motor control system 10 includes a drive inverter 120 that controls the drive motor 110 based on control signals sent from the vehicle control unit 2 of the electric vehicle. The motor control system 10 includes a pump inverter 220 that controls the pump motor 210 based on drive command signals sent from the drive inverter 120. The motor control system 10 includes an actuator inverter 320 that controls the actuator motor 310 based on drive command signals sent from the drive inverter 120. Furthermore, when the reception of the drive command signal ends, the pump inverter 220 switches to an operation state that suppresses power consumption. Similarly, when the reception of the drive command signal ends, the actuator inverter 320 switches to an operation state that suppresses power consumption.

[0074] In this embodiment, the drive inverter 120 in the motor control system 10 terminates the transmission of drive command signals based on control signals sent from the vehicle control unit 2.

[0075] In this embodiment, the drive inverter 120 of the motor control system 10 terminates the transmission of drive command signals after a predetermined time based on the control signals sent from the vehicle control unit 2.

[0076] The pump inverter 220 in the motor control system 10 of this embodiment includes a motor drive unit 221 that drives the pump motor 210. The pump inverter 220 includes a control unit 222 that controls the motor drive unit 221. The pump inverter 220 includes a signal detection unit 223 that detects whether a drive command signal is received. The pump inverter 220 includes a circuit switching unit 224 that switches the circuit supplying power to the motor drive unit 221 and the control unit 222.

[0077] In this embodiment, the circuit switching unit 224 in the motor control system 10 switches from on to off when the signal detection unit 223 detects that the reception of the drive command signal has ended.

[0078] In this embodiment, the circuit switching unit 224 in the motor control system 10 becomes disconnected after the drive command signal reception ends and a predetermined time has elapsed.

[0079] Similarly, the actuator inverter 320 in the motor control system 10 of this embodiment includes a motor drive unit for driving the actuator motor. The actuator inverter 320 includes a control unit for controlling the motor drive unit. The actuator inverter 320 includes a signal detection unit for detecting whether a drive command signal is received. The actuator inverter 320 includes a circuit switching unit for switching the circuit supplying power to the motor drive unit and the control unit on and off.

[0080] In this embodiment, the circuit switching section of the actuator inverter 320 in the motor control system 10 switches from on to off when the signal detection section detects that the transmission of the drive command signal has ended.

[0081] In this embodiment, the circuit switching section of the actuator inverter 320 in the motor control system 10 becomes open after the transmission of the drive command signal ends and a predetermined time has elapsed.

[0082] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. Based on the claims, it is clear that such modified or improved embodiments are also included within the technical scope of the present invention.

[0083] In the above embodiments, a rechargeable battery electric vehicle was described as an example of a "vehicle". However, a "vehicle" may not include a drive motor and is not limited to a rechargeable battery electric vehicle. A "vehicle" may also be a hydrogen fuel cell vehicle that stores hydrogen in its fuel tank and uses a hydrogen fuel cell to generate electricity to drive a drive motor. A "vehicle" may also be a metal fuel cell vehicle that uses a metal-air battery to drive a drive motor. A "vehicle" may also be an ethanol fuel cell vehicle that stores ethanol in its fuel tank and uses a fuel cell to generate electricity to drive. A "vehicle" may also be a trolleybus that uses an overhead tram line to transmit electricity on a main line with overhead lines, uses a drive motor to drive and charge a rechargeable battery, and can operate as a battery electric vehicle on a branch line without overhead lines. A "vehicle" may also be an intermittently powered electric vehicle that charges itself by generating electricity during braking during operation and discharges it on the next departure. A "vehicle" may also be a contactless charging vehicle that uses electromagnetic induction and resonance phenomena to generate electricity and charge itself during operation from underground overhead lines buried under the road. "Vehicle" can also refer to a modified electric vehicle, which is a car with a gasoline engine or diesel engine whose engine, muffler, and fuel tank have been removed and a drive motor and battery have been installed.

[0084] In the above embodiments, a motor unit 1 comprising a drive motor 110 as a "first motor" and a pump motor 210 and an actuator motor 310 as a "second motor" has been described as an example. The motor unit 1 comprising a drive inverter 120 as a "first inverter" and a pump inverter 220 and an actuator inverter 320 as "second inverters" has also been described as an example. However, if... Figure 6 As shown, the "motor unit" only needs to include a "first motor" and a "second motor" for driving the "first motor". Furthermore, as... Figure 6 As shown, the "motor unit" only needs to include a "first inverter" that controls the "first motor" based on control signals sent from the vehicle's "main control unit". For example... Figure 6 As shown, the "motor unit" only needs to include a "second inverter" that controls the "second motor" based on the drive command signal sent from the "first inverter" to drive the "second motor". For example, the "second motor" can also be a clutch motor, a speed change mechanism motor, a water pump motor, etc.

[0085] It should be noted that the execution order of actions, sequences, steps, and stages in the apparatus, system, program, and method shown in the claims, specification, and drawings can be implemented in any order unless specifically stated as "before," "beforehand," or the output of a previous process is used in a later process. For the sake of convenience, even if the flow of actions in the claims, specification, and drawings is described using terms such as "firstly" or "next," it does not mean that they must be implemented in this order.

[0086] Symbol Explanation

[0087] 1 Motor unit; 2 Vehicle control unit; 3 High-voltage battery; 4 12V battery; 5 Ignition switch; 10 Motor control system; 110 Drive motor; 120 Drive inverter; 200 Electric oil pump; 210 Pump motor; 220 Pump inverter; 221 Motor drive unit; 222 Control unit; 223 Signal detection unit; 224 Circuit switching unit; 300 Electric actuator; 310 Actuator motor; 320 Actuator inverter.

Claims

1. A motor unit, comprising: A first motor, which drives the vehicle; And a second motor, the second motor driving the auxiliary mechanism of the first motor, The motor unit includes: a first inverter, which controls the first motor based on control signals sent from the vehicle's main control unit; and The second inverter controls the second motor based on a drive command signal sent from the first inverter to drive the second motor. Once the reception of the drive command signal has ended, the second inverter switches to a state of suppressing power consumption. The second inverter includes: A motor drive unit drives the second motor; A control unit that controls the motor drive unit; The signal detection unit detects whether the drive command signal is received; and The circuit switching section switches the connection and disconnection of the circuit that supplies power to the motor drive section and the control section.

2. The motor unit according to claim 1, wherein, The first inverter terminates the transmission of the drive command signal based on the control signal sent from the main control device.

3. The motor unit according to claim 2, wherein, The first inverter, based on the control signal sent from the main control device, terminates the transmission of the drive command signal after a predetermined time.

4. The motor unit according to claim 1, wherein, The circuit switching unit switches from on to off when the signal detection unit detects that the reception of the drive command signal has ended.

5. The motor unit according to claim 4, wherein, When the reception of the drive command signal has ended and a specified time has elapsed, the circuit switching part becomes open.

6. The motor unit according to any one of claims 1 to 5, wherein, The auxiliary machine is an electric actuator or an electric oil pump for the parking locking mechanism.

7. A motor control system for controlling a first motor and a second motor, wherein the first motor drives a vehicle and the second motor drives an auxiliary machine of the first motor, the motor control system comprising: The first inverter controls the first motor based on control signals sent from the vehicle's main control unit; as well as The second inverter controls the second motor based on drive command signals sent from the first inverter to control the second motor. Once the reception of the drive command signal has ended, the second inverter switches to a state of suppressing power consumption. The second inverter includes: A motor drive unit drives the second motor; A control unit that controls the motor drive unit; The signal detection unit detects whether the drive command signal is received; and The circuit switching section switches the connection and disconnection of the circuit that supplies power to the motor drive section and the control section.

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