WO2021095737A1 - Rotating electrical machine control device - Google Patents

Abstract

A rotating electric machine control device (50) is applied to a rotating electric machine system (100) comprising a rotating electric machine (20), a first energy storage device (40), and a second energy storage device (42). The rotating electric machine system comprises a first inverter (20), a second inverter (30), a first breaker switch (60), and a second breaker switch (62). The rotating electric machine control device (50) comprises: an abnormality assessment unit that assesses whether an abnormality has occurred in the first inverter and/or the first breaker switch, or in the second inverter and/or the second breaker switch; a power breaker unit that, when it has been assessed that an abnormality has occurred, shuts off input and output of power between the rotating electric machine and the abnormality-side energy storage device on the side at which the abnormality has occurred; and a command value revision unit that, when the input and output of power has been shut off, revises an electric current command value for the non-abnormality-side inverter connected to the non-abnormality-side energy storage device so as to keep the output torque of the rotating electrical machine at a pre-shutoff torque (TS).

Description

Rotating machine control device Cross-reference of related applications

This application is based on Japanese Application No. 2019-204094 filed on November 11, 2019, and the contents of the description are incorporated herein by reference.

This disclosure relates to a control device for a rotary electric machine.

Conventionally, a drive system equipped with a rotary electric machine having an open winding is known. In this drive system, for example, as seen in Patent Document 1, a first inverter is connected to the first end of both ends of the windings of each phase constituting the rotary electric machine. The rotary electric machine is connected to the first voltage source via the first inverter, and a first relay is provided between the first inverter and the first voltage source. Further, a second inverter is connected to the second end of both ends of the winding of each phase constituting the rotary electric machine. The rotary electric machine is connected to the second voltage source via the second inverter, and a second relay is provided between the second inverter and the second voltage source.

In the drive system described above, when an upper / lower arm short-circuit abnormality in which both the upper arm switch and the lower arm switch are turned on is detected in either the first inverter or the second inverter phase, the first and second are used. Of the relays, turn off the short-circuit side relay that is connected to the short-circuit inverter in which the upper and lower arm short-circuit error has occurred. As a result, it is possible to prevent an overcurrent from flowing to the short-circuit side voltage source connected to the short-circuit inverter via the short-circuit side relay, and it is possible to protect the voltage source.

Japanese Unexamined Patent Publication No. 2016-123232

When the short-circuit side relay is turned off, the rotary electric machine is continuously driven by using only one voltage source different from the short-circuit side voltage source among the first and second voltage sources. In the technique of Patent Document 1, the problem in the case of continuing the driving of the rotary electric machine using only one voltage source has not been sufficiently examined.

For example, it is conceivable that an upper and lower arm short-circuit abnormality occurs when the rotary electric machine is being driven in a high rotation state. In this case, if the rotary electric machine is continuously driven by using only one voltage source, for example, and the output torque of the rotary electric machine suddenly decreases, it is included in the inverters different from the short-circuit inverters among the first and second inverters. ， Chattering occurs in which the lower arm switch is switched on and off multiple times. As a result, there arises a problem that the driving of the rotary electric machine cannot be continued properly. It should be noted that such problems are not limited to the upper and lower arm short-circuit abnormalities, but are the off abnormalities in which the upper and lower arm switches included in the inverter remain off, and the upper and lower arm switches or relays included in the inverter remain on. This is a common problem when the drive of the rotary electric machine is continued using only one voltage source in the case where the on abnormality occurs.

The present disclosure has been made to solve the above problems, and an object of the present invention is to provide a control device for a rotary electric machine capable of properly continuing to drive a rotary electric machine even when an abnormality occurs in an inverter or a relay. It is in.

The first means for solving the above-mentioned problems includes a rotary electric machine having a multi-phase winding, and a first power storage device and a second power storage device that input and output electric power between the rotary electric machines. A control device for a rotary electric machine applied to a rotary electric machine system, wherein the rotary electric machine system has an upper arm switch and a lower arm switch connected to the first power storage device and connected in series for each phase. The connection points between the upper arm switch and the lower arm switch are connected to the first inverter of both ends of the windings of each phase, and the upper arm switch connected to the second power storage device and connected in series. A second inverter which has a lower arm switch and a lower arm switch for each phase, and a connection point between the upper arm switch and the lower arm switch is connected to the second end of both ends of the winding of each phase, and the first one. A first cutoff switch provided on the first connection line connecting the power storage device and the first inverter, and a second cutoff switch provided on the second connection line connecting the second power storage device and the second inverter. An abnormality determination unit for determining whether or not an abnormality has occurred in at least one of the first inverter and the first cutoff switch, or at least one of the second inverter and the second cutoff switch, and the first When the power storage device on the side where the abnormality has occurred is the abnormal side power storage device and the other power storage device is the normal side power storage device among the 1 power storage device and the second power storage device, the abnormality is generated by the abnormality determination unit. When it is determined that the power is cut off, the power cutoff unit that cuts off the input / output of power between the abnormal side power storage device and the rotary electric machine, and the power cutoff unit between the abnormal side power storage device and the rotary electric machine. In order to maintain the output torque of the rotary electric machine at the pre-cutting torque, which is the output torque of the rotary electric machine before the cutoff, when the input / output of the electric power in the above is cut off, the first inverter and the second inverter Among them, a command value changing unit for changing the current command value of the normal side inverter, which is an inverter connected to the normal side power storage device, is provided.

In this configuration, when an abnormality occurs in at least one of the first inverter and the first switch, or at least one of the second inverter and the second switch, an abnormality occurs in the first power storage device and the second power storage device. The input / output of electric power between the abnormal side power storage device on the side of the inverter and the rotary electric machine is cut off. Then, the rotary electric machine is continuously driven by using only the normal side power storage device different from the abnormal side power storage device. In this case, in the above configuration, in order to maintain the output torque of the rotary electric machine at the torque before interruption of the rotary electric machine, the current command value of the normal side inverter connected to the normal side power storage device among the first inverter and the second inverter. To change. As a result, it is possible to suppress a decrease in the output torque of the rotary electric machine due to power interruption between the abnormal side power storage device and the rotary electric machine, and it is possible to suppress the occurrence of chattering in the normal side inverter. As a result, the driving of the rotary electric machine can be continued properly.

In the second means, when the input / output of electric power between the abnormal side power storage device and the rotary electric machine is cut off by the power cutoff unit, the normal side power storage device is based on the voltage of the normal side power storage device. A torque determination unit for determining whether or not the torque before interruption can be maintained by the device is provided, and the command value changing unit determines the output torque of the rotary electric machine based on the determination result of the torque determination unit. The current command value of the normal side inverter is changed to maintain the value.

When the input / output of electric power between the abnormal side power storage device and the rotary electric machine is cut off, whether or not the normal side power storage device can maintain the torque before the cutoff depends on the power storage state of the normal side power storage device. In the second means, it is determined whether or not the torque before interruption can be maintained by the normal side power storage device based on the voltage of the normal side power storage device. The voltage of the normal side power storage device is proportional to the amount of electricity stored in the normal side power storage device. Therefore, it is possible to appropriately determine whether or not the torque before interruption can be maintained by the normal side power storage device by using the voltage of the normal side power storage device.

Specifically, as shown by the third means, when the voltage of the normal side power storage device is set as the voltage limit value of the voltage applied to the rotary electric machine, the rotation in the dq coordinate system of the rotary electric machine. The ellipse defined by the d and q-axis currents flowing through the electric machine is a voltage limiting ellipse, and the torque determination unit connects points in the dq coordinate system that have a torque equal to the torque before interruption. When a part is present in the voltage limiting ellipse, it is determined that the torque before interruption can be maintained, and when the equal torque line does not exist in the voltage limiting ellipse, it is determined that the torque before interruption cannot be maintained. It is preferable to do so.

In the fourth means, when the torque determination unit determines that the torque before interruption can be maintained, the command value changing unit sets the current command value of the normal side inverter in the voltage limiting ellipse, etc. Change to the current command value of the equal torque point on the torque line.

In this configuration, when it is determined that the torque before interruption can be maintained, the current command value of the normal side inverter when maintaining the torque before interruption is determined by using the voltage limiting ellipse and the equal torque line. Change to the current command value of. Therefore, the changed current command value can be easily set by using the voltage limiting ellipse and the equal torque line.

In the fifth means, when the torque determination unit determines that the torque before interruption cannot be maintained, the command value changing unit rotates the current command value of the normal side inverter on the voltage limiting ellipse. Change to the current command value at the maximum torque point where the output torque of the electric machine is maximized.

In this configuration, when it is determined that the torque before interruption cannot be maintained, the current command value of the normal side inverter when the torque before interruption cannot be maintained is set to the maximum at which the output torque of the rotating electric machine becomes maximum on the voltage limiting ellipse. Change to the current command value of the torque point. Therefore, even if the torque before interruption cannot be maintained, a certain amount of output torque can be secured. Further, it is possible to suppress a decrease in the output torque of the rotary electric machine due to power interruption between the abnormal side power storage device and the rotary electric machine, and it is possible to suitably suppress the occurrence of chattering in the normal side inverter.

In the sixth means, when the torque determination unit determines that the torque before interruption cannot be maintained, the command value changing unit determines whether or not the rotary electric current is in a high rotation state, and the rotation is performed. When the electric machine is not in the high rotation state, the current command value of the normal side inverter is changed to the current command value of the maximum torque point, and when the rotating electric machine is in the high rotation state, the current of the normal side inverter is changed. The command value is changed to the current command value at the zero torque point on the q-axis within the voltage limiting ellipse.

If the torque before interruption cannot be maintained, it is conceivable that the output torque generated in the rotary electric machine is set to zero in order to reduce the output torque of the rotary electric machine while maintaining the rotation of the rotary electric machine. In this case, when the rotary electric machine is in a high rotation state, the counter electromotive force of the rotary electric machine is excessive. Therefore, in order to suppress the back electromotive force from being applied to the first inverter or the like, the rotary electric machine is used. It is preferable to pass a d-axis current. In the sixth means, the current command value of the normal side inverter when the rotating electric machine is in the high rotation state when the torque before interruption cannot be maintained is set to the current command of the zero torque point on the d-axis in the voltage limiting ellipse. Change to a value. As a result, the output torque of the rotary electric machine can be reduced while maintaining the rotation of the rotary electric machine, and the back electromotive force of the rotary electric machine can be suppressed. As a result, it is possible to suppress the application of an excessive counter electromotive force to the first inverter and the like, and it is possible to appropriately protect the first inverter and the like.

Then, when the rotating electric machine is no longer in the high rotation state, the current command value at the zero torque point is changed to the current command value at the maximum torque point. As a result, it is possible to suitably suppress a decrease in the output torque of the rotary electric machine from the torque before interruption.

In the seventh means, when the abnormality determination unit determines that the abnormality has occurred in either the first inverter or the second inverter, the abnormality among the first inverter and the second inverter is described. In the abnormal side inverter in which the above-mentioned problem occurred, the specific switch in which the abnormality occurred was identified, and it was determined whether the specific switch had an off abnormality or an on abnormality. When the determination unit determines that the off abnormality has occurred in the specific switch, the abnormal side switch of the first cutoff switch and the second cutoff switch on the side where the abnormality has occurred is switched off and at the same time. Of the upper arm switch and the lower arm switch in the abnormal side inverter, all the switches on the arm side including the specific switch are switched off, and all the switches on the arm side not including the specific switch are switched on. When the abnormality determination unit determines that the on abnormality has occurred in the specific switch, the abnormality side switch is switched off and all the switches on the arm side including the specific switch are switched on. Turn off all switches on the arm side, not including the specific switch.

In this configuration, when it is determined that an abnormality has occurred in either the first inverter or the second inverter, the specific switch in which the abnormality has occurred in the abnormal side inverter in which the abnormality has occurred among the first inverter and the second inverter. And determine the type of abnormality that occurred in the specific switch. Then, depending on the type of the determined abnormality, the upper and lower arm switches included in the abnormal side inverter are switched on and off. As a result, the inverter on the abnormal side can be appropriately driven to the neutral point according to the type of abnormality generated in the specific switch, and the driving of the rotary electric machine can be continued.

The above objectives and other objectives, features and advantages of the present disclosure will be clarified by the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is an overall configuration diagram of the drive system. FIG. 2 is a flowchart showing the procedure of the change process. FIG. 3 is a diagram showing a current command value when a part of the equal torque line is present in the second voltage limiting ellipse. FIG. 4 is a diagram showing a current command value when there is no equal torque line in the second voltage limiting ellipse. FIG. 5 is a diagram showing a current command value when there is no equal torque line in the second voltage limiting ellipse. FIG. 6 is a diagram showing the relationship between the angular velocity and the d-axis current when the q-axis current is set to zero. FIG. 7 is a diagram showing the relationship between the type of abnormality and the switching of the switch when the upper arm switch of the first inverter becomes abnormal.

Hereinafter, an embodiment in which the rotary electric machine control device according to the present disclosure is applied to the in-vehicle rotary electric machine system 100 will be described with reference to the drawings.

As shown in FIG. 1, the rotary electric machine system 100 according to the present embodiment includes a rotary electric machine 10, a first inverter 20, a second inverter 30, a first battery 40 as a first power storage device, and a second power storage device. A second battery 42 as a device and a control device 50 for controlling the rotary electric machine 10 are provided.

The rotary electric machine 10 has functions of power running drive and regenerative drive, and specifically, it is an MG (Motor Generator). The rotary electric machine 10 inputs and outputs electric power to and from the first battery 40 and the second battery 42. Specifically, during power driving, the vehicle is driven by the electric power input from the first battery 40 and the second battery 42 to give propulsive force to the vehicle, and during regenerative driving, power is generated using the deceleration energy of the vehicle. Power is output to the first battery 40 and the second battery 42.

The rotary electric machine 10 has an open delta type three-phase winding 11. The winding 11 is a multi-phase winding corresponding to each of the U-phase, V-phase, and W-phase. The rotor of the rotary electric machine 10 is connected to the drive wheels of the vehicle so as to be able to transmit power. The rotary electric machine 10 is, for example, a synchronous machine.

The first end of both ends of the winding 11 of each phase of the rotary electric machine 10 is connected to the first battery 40 via the first inverter 20. The first battery 40 is a rechargeable / dischargeable storage battery, for example, an assembled battery in which a plurality of lithium ion storage batteries are connected in series. The first battery 40 may be another type of storage battery.

The first inverter 20 is a series connection of an upper arm switch 22 (22A, 22B, 22C) which is a switching element on the high potential side and a lower arm switch 23 (23A, 23B, 23C) which is a switching element on the low potential side. However, they are connected in parallel. In each phase, the first end of the winding 11 is connected to the connection point between the upper arm switch 22 and the lower arm switch 23. In this embodiment, voltage-controlled semiconductor switching elements are used as switches 22 and 23, and more specifically, IGBTs are used. Freewheel diodes 24 are connected in antiparallel to each of the switches 22 and 23, respectively.

Further, the second end of both ends of the winding 11 of each phase is connected to the second battery 42 via the second inverter 30. The second battery 42 is a power storage device that can be charged and discharged. The second battery 42 may be the same type of power storage device as the first battery 40, or may be a different type of power storage device.

The second inverter 30 is a series connection of an upper arm switch 32 (32A, 32B, 32C) which is a switching element on the high potential side and a lower arm switch 33 (33A, 33B, 33C) which is a switching element on the low potential side. However, they are connected in parallel. In each phase, the second end of the winding 11 is connected to the connection point between the upper arm switch 32 and the lower arm switch 33. In this embodiment, voltage-controlled semiconductor switching elements are used as switches 32 and 33, and more specifically, IGBTs are used. A freewheel diode 34 is connected to each of the switches 32 and 33 in antiparallel.

The high potential side of the first battery 40 and the high potential side of the first inverter 20 are connected by the first power supply line LE1, and the low potential side of the first battery 40 and the low potential side of the first inverter 20 are , Is connected by the first ground wire LG1. A first capacitor 25 is connected between the first power supply line LE1 and the first ground line LG1. Further, the high potential side of the second inverter 30 and the high potential side of the second battery 42 are connected by the second power supply line LE2, and the low potential side of the second inverter 30 and the low potential side of the second battery 42. Is connected by a second ground wire LG2. A second capacitor 35 is connected between the second power supply line LE2 and the second ground line LG2. In this embodiment, the high potential side of the first inverter 20 and the high potential side of the second inverter 30 are not connected by a connecting line, and the low potential side of the first inverter 20 and the low potential side of the second inverter 30 are low. It is not connected to the potential side by a connecting line.

A first cutoff switch 60 is provided between the first capacitor 25 and the first battery 40 of the first power supply line LE1. Further, a second cutoff switch 62 is provided between the second capacitor 35 and the second battery 42 of the second power supply line LE2. In this embodiment, relay switches are used as these switches 60 and 62. The first cutoff switch 60 and the second cutoff switch 62 are normally turned on when the rotary electric machine 10 is driven. In the present embodiment, the first power supply line LE1 corresponds to the "first connection line", and the second power supply line LE2 corresponds to the "second connection line".

The control device 50 includes a well-known microcomputer including a CPU, ROM, RAM, flash memory, and the like. The control device 50 acquires various signals and executes various controls based on the acquired information.

Specifically, the control device 50 has a first voltage sensor 51 that detects the first voltage VB1 of the first battery 40 and a second voltage that detects the second voltage VB2 of the second battery 42 when the rotary electric machine 10 is driven. The detection value is acquired from the sensor 52, the phase current sensor 53 that detects the current IB flowing through the winding 11 of each phase of the rotary electric machine 10, the rotation angle sensor 54 that detects the electric angle θ of the rotary electric machine 10, and the like. The control device 50 controls the first inverter 20 and the second inverter 30 in order to control the control amount of the rotary electric machine 10 to the command value based on the acquired detected value. The control amount is, for example, the output torque TE.

Specifically, in the control of the first inverter 20, the control device 50 sets the first drive signal SG1 corresponding to each of the switches 22 and 23 in order to alternately turn on the switches 22 and 23 with a dead time in between. Output to switches 22 and 23. The first drive signal SG1 takes either an on command instructing the switches 22 and 23 to switch to the on state and an off command instructing the switch to switch to the off state. The same applies to the second drive signal SG2 in the second inverter 30.

Further, the control device 50 determines the abnormality of the first inverter 20 and the first cutoff switch 60 based on the acquired detected value. The abnormality of the first inverter 20 is, for example, the off abnormality of the switches 22 and 23 in which the switches 22 and 23 included in the first inverter 20 remain off, and the abnormality of the switches 22 and 23 in which the switches 22 and 23 remain on. On Abnormal. Further, the abnormality of the first cutoff switch 60 is, for example, an off abnormality of the first cutoff switch 60 in which the first cutoff switch 60 remains off. Then, based on the determined abnormality, the first and second switching signals SC1 and SC2 are generated in order to switch the on / off of the first and second cutoff switches 60 and 62, and the generated first and second switching signals SC1 and are generated. The SC2 is output to the first and second cutoff switches 60 and 62. The control device 50 generates the first and second drive signals SG1 and SG2 so as to correspond to the generated first and second switching signals SC1 and SC2.

Further, the control device 50 calculates the first remaining capacity (for example, SOC) of the first battery 40 based on the acquired first voltage VB1 of the first battery 40, and obtains the second voltage VB2 of the second battery 42. The second remaining capacity (for example, SOC) of the second battery 42 is calculated based on the above. Then, the first and second drive signals SG1 and SG2 are generated based on the calculated first remaining capacity and the second remaining capacity.

By the way, in the rotary electric machine system 100 of the present embodiment, for example, in any phase of the first inverter 20, an on abnormality occurs in the upper arm switch 22, and both the upper arm switch 22 and the lower arm switch 23 are turned on. The upper and lower arms may be short-circuited. In this case, as in the prior art, of the first cutoff switch 60 and the second cutoff switch 62, the first cutoff switch 60 connected to the first inverter 20 in which the upper and lower arm short-circuit abnormality has occurred can be turned off. .. As a result, it is possible to prevent an overcurrent from flowing through the first battery 40, and it is possible to protect the first battery 40.

After the first cutoff switch 60 is turned off, the rotary electric machine 10 continues to be driven using only the second battery 42. In this case, the drive of the rotary electric machine 10 cannot be properly continued depending on the second drive signal SG2 output to the switches 32 and 33 included in the second inverter 30.

For example, it is conceivable that an upper and lower arm short-circuit abnormality occurs when the rotary electric machine 10 is being driven in a high rotation state. In this case, the rotary electric machine 10 is continuously driven by using only the second battery 42, and the second drive signal SG2 output to the switches 32 and 33 included in the second inverter 30 is the first cutoff switch 60. When the second drive signal SG2 before being turned off is maintained, the output torque TE of the rotary electric machine 10 sharply decreases. As a result, if chattering occurs in which the switches 32 and 33 are switched on and off a plurality of times, the driving of the rotary electric machine 10 cannot be continued properly.

Therefore, in the rotary electric machine system 100 of the present embodiment, the output torque TE of the rotary electric machine 10 is maintained at the pre-cutoff torque TS, which is the output torque TE of the rotary electric machine 10 before the first cutoff switch 60 is turned off. A change process for changing the second drive signal SG2 output to the switches 32 and 33 is performed. As a result, it is possible to suppress a decrease in the output torque TE of the rotary electric machine 10 due to the first cutoff switch 60 being turned off, and it is possible to suppress the occurrence of chattering in the second inverter 30. As a result, the driving of the rotary electric machine 10 can be continued properly. The same applies to the case where the upper and lower arm short-circuit abnormality is detected in the second inverter 30, and the case where another abnormality is detected in the first inverter 20 or the second inverter 30.

FIG. 2 shows a flowchart of the change process of the present embodiment. The control device 50 repeatedly executes the change process at predetermined control cycles when the rotary electric machine 10 is driven.

When the change process is started, first, in steps S10 to S16, an abnormality is found in at least one of the first inverter 20 and the first cutoff switch 60 or at least one of the second inverter 30 and the second cutoff switch 62 in the rotary electric machine system 100. Determine if it has occurred. In this embodiment, the processes of steps S10 to S16 correspond to the "abnormality determination unit".

Specifically, first, in step S10, it is determined whether or not an abnormality has occurred in the rotary electric machine system 100 based on the current IB acquired from the phase current sensor 53.

Overcurrent due to on abnormality of switches 22, 23, 32, 33 included in the first and second inverters 20 and 30, and off abnormality of switches 22, 23, 32, 33 and first and second cutoff switches 60 and 62. When the current interruption due to the above does not occur, the acquired current IB is within the specified current range. In this case, a negative determination is made in step S10, and the change process ends.

On the other hand, when an overcurrent or current interruption occurs, the acquired current IB is out of the specified current range. In this case, an affirmative determination is made in step S10, and in the following step S12, the device in which the abnormality has occurred is the first device based on the first and second voltages VB1 and VB2 acquired from the first and second voltage sensors 51 and 52. 1. Determine whether or not the second inverters are 20 and 30.

When the power cutoff between the first and second batteries 40 and 42 and the first and second inverters 20 and 30 occurs due to the off abnormality of the first and second cutoff switches 60 and 62, the first and first cutoff switches 60 and 62 are cut off. The pulsation of the two voltages VB1 and VB2 is suppressed. In this case, a negative determination is made in step S12, and the process proceeds to step S16.

On the other hand, when the power cutoff does not occur, the first and second voltages VB1 and VB2 pulsate by switching the switches 22, 23, 32, and 33 included in the first and second inverters 20 and 30 on and off. In this case, an affirmative determination is made in step S12, and in the subsequent step S14, it is determined whether or not the inverter in which the abnormality has occurred is the first inverter 20. If an affirmative determination is made in step S14, the first cutoff switch 60 is turned off in step S18, and the process proceeds to steps S22 to S30. On the other hand, if a negative determination is made in step S14, the second cutoff switch 62 is turned off in step S20, and the process proceeds to steps S32 to S40.

That is, in steps S18 and S20, when it is determined that an abnormality has occurred in the rotary electric machine system 100, between the first battery 40 and the second battery 42, the battery on the side where the abnormality has occurred and the rotary electric machine 10. Shut off the input and output of power in. In this embodiment, the processes of steps S18 and S20 correspond to the "power cutoff unit".

In the following steps S22 to S30, the switches 22 and 23 in which the abnormality has occurred are specified, and it is determined whether the abnormality is an off abnormality or an on abnormality. That is, in steps S22 to S30, when the abnormal side inverter, which is the inverter including the switch in which the abnormality has occurred among the first and second inverters 20 and 30, is the first inverter 20, each of the first inverters 20 Among the switches 22 and 23, the specific switch that is the switch in which the abnormality has occurred is specified. In addition, it is determined whether an off abnormality has occurred or an on abnormality has occurred in the specific switch.

Specifically, first, in step S22, it is determined whether or not the switch in which the abnormality has occurred is the upper arm switch 22. If an affirmative determination is made in step S22, it is determined in step S24 whether or not the abnormality generated in the upper arm switch 22 is an off abnormality. Further, if a negative determination is made in step S22, it is determined in step S26 whether or not the abnormality generated in the lower arm switch 23 is an off abnormality.

In steps S22 to S26, determination is performed based on, for example, the magnitude and direction of the current IB acquired from the phase current sensor 53, as well as the driving methods of the first and second inverters 20 and 30. Drive methods include, for example, PWM drive and neutral point drive. Here, the PWM drive controls the state of the upper and lower arm switches of each phase based on the magnitude comparison between the target voltage, which is the target value of the output voltage to the rotary electric machine 10, and the carrier signal such as the triangular wave signal. It is a drive. Further, the neutral point drive is a drive that keeps at least one of the upper and lower arm switches of the corresponding inverter in the ON state.

When an off abnormality occurs in the upper arm switch 22, an affirmative judgment is made in step S24, and in step S28, the upper arm switch 22 is switched off, the lower arm switch 23 is switched on, and the process proceeds to steps S44 to S54. That is, in step S28, when it is determined that an off abnormality has occurred in the upper arm switch 22, the first cutoff switch, which is the switch on the side where the abnormality has occurred, among the first cutoff switch 60 and the second cutoff switch 62. Switch 60 off. Then, among the upper arm switch 22 and the lower arm switch 23 in the first inverter 20, the upper arm switches 22 of all phases including the upper arm switch 22 in which the abnormality has occurred are switched off, and the lower arm switches 23 of all the phases are switched off. Is switched on (see FIG. 7).

On the other hand, when an on abnormality occurs in the upper arm switch 22, a negative determination is made in step S24, and in step S30, the upper arm switch 22 is switched on, the lower arm switch 23 is switched off, and the process proceeds to steps S44 to S54. .. That is, in step S30, when it is determined that an ON abnormality has occurred in the upper arm switch 22, the first cutoff switch, which is the switch on the side where the abnormality has occurred, among the first cutoff switch 60 and the second cutoff switch 62. Switch 60 off. Then, among the upper arm switch 22 and the lower arm switch 23 in the first inverter 20, the upper arm switches 22 of all phases including the upper arm switch 22 in which the abnormality has occurred are switched on, and the lower arm switches 23 of all the phases are switched on. To turn off (see FIG. 7).

If an off abnormality occurs in the lower arm switch 23, an affirmative judgment is made in step S26, and the process proceeds to step S30. Further, when an ON abnormality occurs in the lower arm switch 23, a negative determination is made in step S26, and the process proceeds to step S28.

Further, in steps S32 to S40, the switches 32 and 33 in which the abnormality has occurred are specified, and it is determined whether the abnormality is an off abnormality or an on abnormality. Specifically, first, in step S32, it is determined whether or not the switch in which the abnormality has occurred is the upper arm switch 32. If an affirmative determination is made in step S32, it is determined in step S34 whether or not the abnormality generated in the upper arm switch 32 is an off abnormality. Further, if a negative determination is made in step S32, it is determined in step S36 whether or not the abnormality generated in the lower arm switch 33 is an off abnormality.

When an off abnormality occurs in the upper arm switch 32, an affirmative judgment is made in step S34, and in step S38, the upper arm switch 32 is switched off, the lower arm switch 33 is switched on, and the process proceeds to steps S64 to S74. That is, in step S38, when it is determined that an off abnormality has occurred in the upper arm switch 32, the second cutoff switch, which is the switch on the side where the abnormality has occurred, among the first cutoff switch 60 and the second cutoff switch 62. Switch 62 off. Then, among the upper arm switch 32 and the lower arm switch 33 in the second inverter 30, the upper arm switches 32 of all the phases including the upper arm switch 32 in which the abnormality has occurred are switched off, and the lower arm switches 33 of all the phases are switched off. To turn on.

On the other hand, when an on abnormality occurs in the upper arm switch 32, a negative determination is made in step S34, and in step S40, the upper arm switch 32 is switched on, the lower arm switch 33 is switched off, and the process proceeds to steps S64 to S74. .. That is, in step S40, when it is determined that an ON abnormality has occurred in the upper arm switch 22, the second cutoff switch, which is the switch on the side where the abnormality has occurred, among the first cutoff switch 60 and the second cutoff switch 62. Switch 62 off. Then, among the upper arm switch 32 and the lower arm switch 33 in the second inverter 30, the upper arm switches 32 of all the phases including the upper arm switch 32 in which the abnormality has occurred are switched on, and the lower arm switches 33 of all the phases are switched on. Switch off.

Further, when an off abnormality occurs in the lower arm switch 33, an affirmative determination is made in step S36, and the process proceeds to step S40. Further, when an ON abnormality occurs in the lower arm switch 33, a negative determination is made in step S36, and the process proceeds to step S38.

In steps S44 to S54, the current command value IK of the second inverter 30 connected to the second battery 42 on the side where no abnormality has occurred is changed in order to maintain the output torque TE of the rotary electric machine 10 at the torque TS before interruption. To do. Here, immediately before the first cutoff switch 60 is turned off means, for example, one or several times before the control cycle in which the abnormality is determined.

Specifically, first, in step S44, it is determined whether or not the torque TS before interruption can be maintained based on the second voltage VB2 acquired from the second voltage sensor 52. In this embodiment, the processes of steps S44 and S64 correspond to the "torque determination unit".

Here, the maintenance determination of the torque TS before interruption will be described with reference to FIGS. 3 to 5. FIG. 3 shows the rotary electric machine 10 when the sum of the first voltage VB1 of the first battery 40 and the second voltage VB2 of the second battery 42 is the voltage limit value VR of the voltage applied to the rotary electric machine 10. In the dq coordinate system of, the ellipse defined by the d-axis component (hereinafter, d-axis current) Id and the q-axis component (hereinafter, q-axis current) Iq of the current vector of the rotary electric machine 10 determined by the current IB flowing through the rotary electric machine 10. The first voltage limiting ellipse CA is described. The first voltage limiting ellipse CA is a range of current vectors that can be passed through the rotary electric machine 10 when the first battery 40 and the second battery 42 can supply electric power to the rotary electric machine 10.

Further, FIG. 3 shows a maximum torque minimum current curve LA determined from the d, q-axis currents Id, and Iq at which the output torque TE of the rotary electric machine 10 is maximum with respect to the current vector per unit size flowing through the rotary electric machine 10. Are listed. As shown by the arrow YA (broken line) in FIG. 3, in the present embodiment, when the first battery 40 and the second battery 42 can supply electric power to the rotary electric machine 10, the rotary electric machine 10 has a first voltage limit. A current vector determined by the intersection PA of the elliptical CA and the maximum torque minimum current curve LA is flowing. That is, the output torque TE when the current vector determined by the intersection PA flows is the torque TS before interruption. FIG. 3 shows an equal torque line LB whose output torque TE is equal to the torque TS before interruption and is determined by the d, q-axis currents Id, and Iq.

When the power is supplied to the rotary electric machine 10 only from the second battery 42 by turning off the first cutoff switch 60, the voltage limit ellipse becomes the second voltage limit from the first voltage limit ellipse CA due to the decrease in the voltage limit value VR. Reduce to ellipse CB. Here, the second voltage limiting ellipse CB is a voltage limiting ellipse defined when the second voltage VB2 of the second battery 42 is set as the voltage limiting value VR. In step S42, it is determined whether or not the output torque of the rotary electric machine 10 can be maintained at the torque TS before interruption by determining whether or not a part of the equal torque line LB exists in the second voltage limiting ellipse CB. To do.

If a part of the equal torque line LB exists in the second voltage limiting ellipse CB, it is determined that the torque TS before interruption can be maintained. In this case, an affirmative determination is made in step S44, and in the following step S50, the current command value IK of the second inverter 30 is set to the equal torque point PB (see FIG. 3) on the equal torque line LB in the second voltage limiting ellipse CB. The current command value is changed to IK, and the change process is completed. Here, the current command value IK is a control target value of the d, q-axis currents Id, Iq for generating a certain output torque TE.

On the other hand, if the equal torque line LB does not exist in the second voltage limiting ellipse CB, it is determined that the torque TS before interruption cannot be maintained. In this case, a negative determination is made in step S44, and in the subsequent step S48, it is determined whether or not the rotary electric machine 10 is in a high rotation state. Here, the high rotation state means that the angular velocity ω of the rotary electric machine 10 is larger than the threshold value ωth (see FIG. 6), and the angular velocity ω of the rotary electric machine 10 is the angular velocity ω of the rotary electric machine 10 acquired from the rotation angle sensor 54. It is calculated based on the electric angle θ.

When the angular velocity ω of the rotary electric machine 10 is equal to or less than the threshold value ωth and the rotary electric machine 10 is in a low rotation state, an affirmative determination is made in step S48. In this case, in the following step S52, the current command value IK of the second inverter 30 is set to the current command of the maximum torque point PC (see FIG. 4) at which the output torque TE of the rotary electric machine 10 is maximized on the second voltage limiting ellipse CB. Change to the value IK and end the change process.

On the other hand, when the angular velocity ω of the rotary electric machine 10 is larger than the threshold value ωth and the rotary electric machine 10 is in a high rotation state, a negative determination is made in step S48. In this case, in the following step S54, the current command value IK of the second inverter 30 is changed to the current command value IK of the zero torque point PD (see FIG. 5) on the q-axis in the second voltage limiting ellipse CB, and the change process is performed. To finish.

That is, in steps S48 to S54, the current command value IK of the second inverter 30 is changed in order to maintain the torque TS before interruption based on the determination result in step S44. In this embodiment, the processes of steps S48 to 54 and S68 to S74 correspond to the "command value changing unit".

Since the processes of steps S64 to S74 are substantially the same as the processes of steps S44 to S54, duplicate explanations will be omitted. That is, in step S64, it is determined whether or not the output torque of the rotary electric machine 10 can be maintained at the torque TS before interruption based on the first voltage VB1 acquired from the first voltage sensor 51. Further, in steps S68 to S74, the current command value IK of the first inverter 20 is changed in order to maintain the torque TS before interruption based on the determination result in step S64.

On the other hand, when the devices in which the abnormality has occurred are the first and second cutoff switches 60 and 62, in step S16, it is determined whether or not the cutoff switch in which the abnormality has occurred is the first cutoff switch 60. If an affirmative determination is made in step S16, the process proceeds to step S30, and if a negative determination is made in step S16, the process proceeds to step S40. When the device in which the abnormality has occurred is the first and second cutoff switches 60 and 62, the abnormality has occurred among the first and second batteries 40 and 42 due to the abnormality of the first and second cutoff switches 60 and 62. The input / output of electric power between the battery on the side and the rotary electric machine 10 is cut off. If an affirmative determination is made in step S16, the process may proceed to step S28, or if a negative determination is made in step S16, the process may proceed to step S38.

Subsequently, the change process will be described more specifically with reference to FIGS. 3 to 5. FIG. 3 shows a situation in which a part of the equal torque line LB exists in the second voltage limiting ellipse CB. In this case, as shown by the arrow YB (solid line) in FIG. 3, the current command value IK of the second inverter 30 is changed to the current command value IK of the equal torque point PB.

In the present embodiment, as the equal torque point PB, the point closest to the intersection PA in the second voltage limiting ellipse CB and on the equal torque line LB is set as the equal torque point PB. As a result, an increase in the absolute value of the d-axis current Id can be suppressed, and the power consumption of the second battery 42 can be suppressed.

FIGS. 4 and 5 show a situation in which the equal torque line LB does not exist in the second voltage limiting ellipse CB. Of these, FIG. 4 shows a situation in which the first voltage limiting ellipse CA is smaller than that in FIG. 5, and the rotary electric machine 10 is in a low rotation state before the first cutoff switch 60 is turned off. Further, FIG. 5 shows a situation in which the first voltage limiting ellipse CA is larger than that in FIG. 4, and the rotary electric machine 10 is in a high rotation state before the first cutoff switch 60 is turned off.

As shown in FIG. 4, when the equal torque line LB does not exist in the second voltage limiting ellipse CB and the rotary electric machine 10 is in a low rotation state, as shown by the arrow YC (solid line) in FIG. 4, the second The current command value IK of the inverter 30 is changed to the current command value IK of the maximum torque point PC.

Here, how to obtain the maximum torque point PC will be described with reference to FIG. FIG. 4 shows a specific equal torque line LC that comes into contact with the second voltage limiting ellipse CB for the first time when an equal torque line in which the output torque TE is reduced from the torque TS before interruption is created. When the maximum torque point PC is obtained, the specific equal torque line LC is obtained, and the intersection of the second voltage limiting ellipse CB and the specific equal torque line LC is set as the maximum torque point PC.

Further, as shown in FIG. 5, when the equal torque line LB does not exist in the second voltage limiting ellipse CB and the rotary electric machine 10 is in a high rotation state, as shown by an arrow YD (solid line) in FIG. The current command value IK of the second inverter 30 is changed to the current command value IK of the zero torque point PD.

In the present embodiment, as the zero torque point PD, the point where the d-axis current Id is the smallest in the second voltage limiting ellipse CB is set as the zero torque point PD. As a result, the counter electromotive force of the rotary electric machine 10 can be suppressed, and it is possible to suppress the application of an excessive counter electromotive force to the first inverter 20 and the like.

Here, the d-axis current Id at the zero torque point PD is shown as follows using Equations 1 to 4. In Equation 1, the d-axis component (hereinafter, d-axis voltage) Vd and q-axis component (hereinafter, q-axis voltage) Vq of the voltage applied to the rotary electric machine 10 in the dq coordinate system of the rotary electric machine 10 and the second battery The relationship of 42 with the second voltage VB2 is shown.

In the present embodiment, the d-axis voltage Vd is expressed as in Equation 2 using the d-axis current Id, the d-axis inductance Ld, the interlinkage magnetic flux component Ψa, and the angular velocity ω of the rotary electric machine 10, and the q-axis voltage Vq is , The q-axis current Iq of the rotary electric machine 10, the q-axis inductance Lq, and the angular velocity ω are used to express the equation 3.

Therefore, the d-axis current Id of the zero torque point PD at which the q-axis current Iq becomes zero is expressed as in Equation 4 using Equations 1 to 3.

As shown in FIG. 6, the d-axis current Id at the zero torque point PD decreases as the angular velocity ω increases, and converges to a constant value (−Ψa / Ld) as the angular velocity ω increases.

According to the present embodiment described in detail above, the following effects can be obtained.

-In the present embodiment, when an abnormality occurs in at least one of the first inverter 20 and the first cutoff switch 60, the input / output of electric power between the first battery 40 and the rotary electric machine 10 is cut off. Then, the rotary electric machine 10 is continuously driven by using only the second battery 42. In this case, in the present embodiment, the current command value IK of the second inverter 30 connected to the second battery 42 is changed in order to maintain the output torque TE of the rotary electric machine 10 at the torque TS before interruption. As a result, it is possible to suppress a decrease in the output torque TE of the rotary electric machine 10 due to power interruption between the first battery 40 and the rotary electric machine 10, and it is possible to suppress the occurrence of chattering in the second inverter 30. As a result, the driving of the rotary electric machine 10 can be continued properly.

When the input / output of electric power between the first battery 40 and the rotary electric machine 10 is interrupted, whether or not the output torque TE of the rotary electric machine 10 can be maintained at the torque TS before interruption by the second battery 42 is determined. 2 It varies depending on the storage state of the battery 42. In the present embodiment, it is determined whether or not the torque TS before interruption can be maintained by the second battery 42 based on the second voltage VB2 of the second battery 42. The second voltage VB2 is proportional to the storage state of the second battery 42. Therefore, using the second voltage VB2, it is possible to appropriately determine whether or not the torque TS before interruption can be maintained by the second battery 42.

-In the present embodiment, when it is determined that the torque TS before interruption can be maintained, the current command value IK of the second inverter 30 when maintaining the torque TS before interruption is equal to the torque of the second voltage limiting ellipse CB. Change to the current command value IK of the equal torque point PB determined by using the line LB. Therefore, the changed current command value IK can be easily set by using the second voltage limiting ellipse CB and the equal torque line LB.

-On the other hand, if it is determined that the torque TS before interruption cannot be maintained, the current command value IK of the second inverter 30 when the torque TS before interruption cannot be maintained is set by the rotary electric machine 10 on the second voltage limiting ellipse CB. The maximum torque point at which the output torque TE is maximized is changed to the current command value IK of the PC. Therefore, even if the torque TS before interruption cannot be maintained, a certain amount of output torque TE can be secured. Further, it is possible to suppress a decrease in the output torque TE of the rotary electric machine 10 due to power interruption between the first battery 40 and the rotary electric machine 10, and it is possible to suitably suppress the occurrence of chattering in the second inverter 30.

-If the torque TS before interruption cannot be maintained, it is conceivable to set the output torque TE generated in the rotary electric machine 10 to zero in order to reduce the output torque TE of the rotary electric machine 10 while maintaining the rotation of the rotary electric machine 10. Be done. In this case, when the rotary electric machine 10 is in a high rotation state, the counter electromotive force of the rotary electric machine 10 is excessive, so that the counter electromotive force is suppressed from being applied to the first inverter 20 and the like. It is preferable to apply a d-axis current Id to the rotary electric machine 10 to perform field weakening. In the present embodiment, the current command value IK of the second inverter 30 when the torque TS before interruption cannot be maintained and the rotary electric machine 10 is in a high rotation state is set on the q-axis in the second voltage limiting ellipse CB. Change to the current command value IK of the zero torque point PD. As a result, the output torque TE of the rotary electric machine 10 can be reduced while maintaining the rotation of the rotary electric machine 10, and the back electromotive force of the rotary electric machine 10 can be suppressed. As a result, it is possible to suppress the application of an excessive counter electromotive force to the first inverter 20 and the like, and it is possible to appropriately protect the first inverter 20 and the like.

Then, when the rotary electric machine 10 is in a low rotation state, the current command value IK at the zero torque point PD is changed to the current command value IK at the maximum torque point PC. As a result, it is possible to suitably suppress a decrease in the output torque TE of the rotary electric machine 10 from the torque TS before interruption.

-In the present embodiment, when it is determined that an abnormality has occurred in the first inverter 20, the switches 22 and 23 in which the abnormality has occurred are specified in the first inverter 20, and the identified switches 22 and 23 are generated. Determine the type of abnormality that has occurred. Then, the on / off states of the switches 22 and 23 included in the first inverter 20 are switched according to the type of the determined abnormality. As a result, the first inverter 20 can be controlled at the neutral point according to the type of abnormality that has occurred, and the rotary electric machine 10 can be continuously driven. The above effect of the present embodiment can be similarly obtained when an abnormality occurs in at least one of the second inverter 30 and the second cutoff switch 62.

(Other embodiments)
The above embodiment may be modified as follows.

-The rotary electric machine 10 is not limited to a three-phase one, but may be a two-phase one or a four-phase or more one. The first inverter 20 and the second inverter 30 may be any inverter having a series connection of upper and lower arm switches for the number of phases of the rotary electric machine 10.

-The first power storage device and the second power storage device are not limited to batteries, but may be capacitors.

-The switch provided in the first inverter 20 and the second inverter 30 is not limited to the IGBT, and may be, for example, a MOSFET. In this case, the body diode of the MOSFET can be used as the diode reversely connected to the switch, and it is not necessary to use the freewheel diodes 24 and 34 separately from the MOSFET.

-In the present embodiment, as the equal torque point PB, the point closest to the intersection PA on the second voltage limiting ellipse CB and the equal torque line LB is selected, but the present invention is not limited to this. It may be a point on the equal torque line LB inside the second voltage limiting ellipse CB. Further, the point farthest from the intersection PA may be selected on the second voltage limiting ellipse CB and on the equal torque line LB. Even in this case, the changed current command value IK can be easily set by using the second voltage limiting ellipse CB and the equal torque line LB as well as the point closest to the intersection PA.

-In this embodiment, the point with the smallest d-axis current Id on the second voltage limiting ellipse CB is selected as the zero torque point PD, but the present invention is not limited to this. It may be a point on the q-axis inside the second voltage limiting ellipse CB. However, by selecting the point on the second voltage limiting ellipse CB where the d-axis current Id is the smallest, the changed current command value IK can be easily set by using the second voltage limiting ellipse CB.

The controls and methods described herein are provided by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. It may be realized. Alternatively, the control device and method thereof described in the present disclosure may be realized by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control device and method thereof described in the present disclosure may be a combination of a processor and memory programmed to perform one or more functions and a processor composed of one or more hardware logic circuits. It may be realized by one or more dedicated computers configured. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

Although this disclosure has been described in accordance with the examples, it is understood that the disclosure is not limited to the examples and structures. The present disclosure also includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms that include only one element, more, or less, are also within the scope of the present disclosure.

Claims (7)

1. A rotation including a rotary electric machine (20) having a multi-phase winding (11) and a first power storage device (40) and a second power storage device (42) that input and output electric power between the rotary electric machine. A rotary electric machine control device (50) applied to an electric system (100).
   The rotary electric machine system
   Each phase has an upper arm switch and a lower arm switch connected to the first power storage device and connected in series, and the connection points between the upper arm switch and the lower arm switch are among both ends of the winding of each phase. The first inverter (20) connected to the first end and
   Each phase has an upper arm switch and a lower arm switch connected to the second power storage device and connected in series, and the connection points between the upper arm switch and the lower arm switch are at both ends of the winding of each phase. Of these, the second inverter (30) connected to the second end and
   A first cutoff switch (60) provided on a first connection line (LE1) connecting the first power storage device and the first inverter, and
   A second cutoff switch (62) provided on a second connection line (LE2) connecting the second power storage device and the second inverter is provided.
   An abnormality determination unit for determining whether or not an abnormality has occurred in at least one of the first inverter and the first cutoff switch, or at least one of the second inverter and the second cutoff switch.
   When the power storage device on the side where the abnormality has occurred is the abnormal side power storage device and the other power storage device is the normal side power storage device among the first power storage device and the second power storage device, the abnormality determination unit determines the abnormality. A power cutoff unit that cuts off the input / output of power between the abnormal side power storage device and the rotary electric machine when it is determined that
   When the input / output of electric power between the abnormal side power storage device and the rotary electric machine is cut off by the power cutoff unit, the output torque of the rotary electric machine is converted into the output torque (TE) of the rotary electric machine before the cutoff. Change the command value to change the current command value of the normal side inverter, which is the inverter connected to the normal side power storage device, among the first inverter and the second inverter, in order to maintain the pre-cutoff torque (TS). A control device for a rotary electric machine including a unit and a unit.
2. When the input / output of electric power between the abnormal side power storage device and the rotary electric machine is cut off by the power cutoff unit, the normal side power storage device of the rotary electric machine is based on the voltage of the normal side power storage device. A torque determination unit for determining whether or not the output torque can be maintained at the pre-cutoff torque is provided.
   The command value changing unit according to claim 1, wherein the command value changing unit changes the current command value of the normal side inverter in order to maintain the output torque of the rotary electric machine at the torque before interruption based on the determination result of the torque determination unit. Control device for rotary electric machine.
3. When the voltage of the normal side power storage device is set as the voltage limit value of the voltage applied to the rotary electric machine, an ellipse defined by the d, q-axis current flowing through the rotary electric machine in the dq coordinate system of the rotary electric machine is formed. It is a voltage limiting ellipse (CB) and
   When a part of the equal torque line (LB) connecting the points having the torque equal to the pre-cutting torque in the dq coordinate system exists in the voltage limiting ellipse, the torque determination unit determines the pre-cutting torque. The control device for a rotary electric machine according to claim 2, wherein it is determined that the torque can be maintained, and when the equal torque line does not exist in the voltage limiting ellipse, it is determined that the torque before interruption cannot be maintained.
4. When the torque determination unit determines that the torque before interruption can be maintained, the command value changing unit sets the current command value of the normal side inverter to an equal torque point on the equal torque line within the voltage limiting ellipse. The control device for a rotary electric machine according to claim 3, wherein the current command value is changed to (PB).
5. When the torque determination unit determines that the torque before interruption cannot be maintained by the command value changing unit, the current command value of the normal side inverter is set to the maximum output torque of the rotary electric machine on the voltage limiting ellipse. The control device for a rotary electric machine according to claim 3 or 4, wherein the current command value is changed to the maximum torque point (PC).
6. When the torque determination unit determines that the torque before interruption cannot be maintained, the command value changing unit determines whether or not the rotary electric machine is in a high rotation state.
   When the rotary electric machine is not in the high rotation state, the current command value of the normal side inverter is changed to the current command value of the maximum torque point.
   The fifth aspect of claim 5, wherein when the rotary electric machine is in the high rotation state, the current command value of the normal side inverter is changed to the current command value of the zero torque point (PD) on the d-axis in the voltage limiting ellipse. Control device for rotary electric machines.
7. When the abnormality determination unit determines that the abnormality has occurred in either the first inverter or the second inverter, the abnormal side inverter of the first inverter and the second inverter in which the abnormality has occurred In, the specific switch in which the abnormality has occurred is specified, and it is determined whether the specific switch has an off abnormality or an on abnormality.
   The power cutoff unit is
   When the abnormality determination unit determines that the off abnormality has occurred in the specific switch, the abnormality side switch of the first cutoff switch and the second cutoff switch on the side where the abnormality has occurred is switched off. At the same time, of the upper arm switch and the lower arm switch in the abnormal side inverter, all the switches on the arm side including the specific switch are switched off, and all the switches on the arm side not including the specific switch are turned on. Switch to
   When the abnormality determination unit determines that the on abnormality has occurred in the specific switch, the abnormality side switch is switched off and all the switches on the arm side including the specific switch are switched on to perform the identification. The control device for a rotary electric machine according to any one of claims 1 to 6, wherein all the switches on the arm side not including the switch are turned off.

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