Control device for rotary electric machine, program, and control method for rotary electric machine

Abstract

To provide a control device for a rotary electric machine capable of preventing an unintended current from flowing through a system when the rotary electric machine is restarted.SOLUTION: A control device 60 is applied to a control system 100 that includes a rotary electric machine 40, first and second inverters 20, 30, busbars 11, 12, and a positive electrode side switch QH. The control device 60 includes: a control unit for performing switching control of the first inverter 20 in a state in which the positive electrode side switch QH is turned off; a pause determining unit that determines whether the system is in a pause mode; a drive determining unit that determines whether the drive of the rotary electric machine 40 is restarted in a state in which the positive electrode side switch QH is turned off when it is determined that the system is in the pause mode; an acquisition unit for acquiring the voltage state of a second capacitor 15b when it is determined that the drive of the rotary electric machine 40 is restarted; and a correction unit for correcting a switching pattern of the switching control of the first inverter 20 on the basis of the acquired voltage state.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a control device for a rotating electrical machine, a program, and a control method for a rotating electrical machine.

Background Art

[0002] Conventionally, a system for controlling a rotating electrical machine by two inverters has been known. In this system, a first inverter is electrically connected to a first end of a plurality of phase windings of the rotating electrical machine, and a second inverter is electrically connected to a second end. A DC power supply is electrically connected in parallel to the first inverter. A capacitor is electrically connected in parallel to the second inverter. As an example of such a technique, the technique disclosed in Patent Document 1 can be cited.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] After the driving of the rotating electrical machine is temporarily stopped, a situation may occur where the driving of the rotating electrical machine is restarted. In this case, due to a difference between the voltage of the capacitor that has decreased during the driving stop of the rotating electrical machine and the voltage applied to the capacitor with the restart of the driving of the rotating electrical machine, there is a concern that an unintended current may flow through the system.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a control device for a rotating electrical machine, a program, and a control method for a rotating electrical machine that can suppress the flow of an unintended current through the system when the driving of the rotating electrical machine is restarted.

Means for Solving the Problems

[0006] The present disclosure is An electric rotating machine having a multi-phase winding, A first inverter having a number of first upper arm switches and first lower arm switches connected in series, and a series connection of the first upper arm switch and the first lower arm switch being connected in parallel to a DC power supply, A second inverter having a number of second upper arm switches and second lower arm switches connected in series, and a series connection of the second upper arm switch and the second lower arm switch being connected in parallel to a capacitor, A positive bus bar that electrically connects the high potential side terminals of the first upper arm switch and the second upper arm switch in each phase, A negative bus bar that electrically connects the low potential side terminals of the first lower arm switch and the second lower arm switch in each phase, A switching switch provided on at least one of the positive bus bar and the negative bus bar, A control device for an electric rotating machine applied to a system including: In each phase, the low potential side terminal of the first upper arm switch and the high potential side terminal of the first lower arm switch are electrically connected to the first end of the winding, In each phase, the low potential side terminal of the second upper arm switch and the high potential side terminal of the second lower arm switch are electrically connected to the second end of the winding, A control unit that controls the electric rotating machine by fixing one of the second upper arm switch and the second lower arm switch to on and the other to off and performing switching control of the first upper arm switch and the first lower arm switch in a state where the switching switch is off, A pause determination unit that determines whether or not the electric rotating machine is in a pause mode in which driving is stopped in a state where the switching switch is off, A drive determination unit that determines whether or not driving of the electric rotating machine is restarted in a state where the switching switch is off when it is determined that the machine is in the pause mode, When it is determined that the driving of the rotating electrical machine is restarted, an acquisition unit that acquires the voltage state of the capacitor, Based on the acquired voltage state, a correction unit that corrects the switching pattern of the switching control so that the voltage applied to the capacitor with the restart of the driving of the rotating electrical machine approaches the current voltage of the capacitor, is provided.

[0007] During the standby mode in which the changeover switch is turned off, the voltage of the capacitor may decrease. In this case, when a voltage is applied to the capacitor with the restart of the driving of the rotating electrical machine, there is a concern that an unintentional current may flow through the system. In this regard, in the switching control of the first upper arm switch and the first lower arm switch that is performed with the changeover switch turned off, the voltage applied to the capacitor changes according to the switching pattern of the switching control.

[0008] Therefore, in the present disclosure, when it is determined that the standby mode is in progress and it is determined that the driving of the rotating electrical machine is restarted with the changeover switch turned off, based on the voltage state of the capacitor at the time of restarting the driving of the rotating electrical machine, the switching pattern of the switching control is corrected. As a result, it becomes possible to perform the switching control so that the voltage applied to the capacitor with the restart of the driving of the rotating electrical machine approaches the current voltage of the capacitor. Therefore, it is possible to suppress the occurrence of a difference between the voltage of the capacitor that has decreased during the standby mode and the voltage applied to the capacitor with the restart of the driving of the rotating electrical machine. As a result, it is possible to suppress the flow of an unintentional current through the system when the driving of the rotating electrical machine is restarted.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0010] A plurality of embodiments will be described with reference to the drawings. In a plurality of embodiments, parts that are functionally and / or structurally corresponding and / or associated parts may be assigned the same reference numerals, or reference numerals that differ in the hundreds place or more. For corresponding parts and / or associated parts, the description of other embodiments can be referred to.

[0011] <First Embodiment> Hereinafter, a first embodiment in which the control device according to the present disclosure is embodied will be described with reference to the drawings. The control device of this embodiment is mounted on an electric vehicle such as an electric car or a hybrid car, and is applied to an in-vehicle control system.

[0012] As shown in FIG. 1, the control system 100 includes a battery 10 (corresponding to a "DC power source"), a first inverter 20, a second inverter 30, and a rotating electrical machine 40. The battery 10 is, for example, a battery pack including a series connection of unit cells. A unit cell is one battery cell or a series connection of a plurality of battery cells. The battery cell is, for example, a secondary battery such as a lithium-ion battery.

[0013] The first inverter 20 and the second inverter 30 are power conversion circuits that convert DC power supplied from the battery 10 into three-phase AC power and supply it to the rotating electrical machine 40.

[0014] The first inverter 20 includes a series connection of U, V, W phase first upper arm switches SUHa, SVHa, SWHa and U, V, W phase first lower arm switches SULa, SVLa, SWLa. The second inverter 30 includes a series connection of U, V, W phase second upper arm switches SUHb, SVHb, SWHb and U, V, W phase second lower arm switches SULb, SVLb, SWLb.

[0015] In the present embodiment, voltage-controlled semiconductor switching elements are used as the switches SUHa to SWLa, SUHb to SWLb, and more specifically, IGBTs are used. In this case, the high-potential side terminals of the switches SUHa to SWLa, SUHb to SWLb are collectors, and the low-potential side terminals are emitters. Free-wheel diodes DUHa, DVHa, DWHa, DULa, DVLa, DWLa, DUHb, DVHb, DWHb, DULb, DVLb, DWLb are connected in antiparallel to the switches SUHa, SVHa, SWHa, SULa, SVLa, SWLa, SUHb, SVHb, SWHb, SULb, SVLb, SWLb.

[0016] The collectors of the first upper arm switches SUHa, SVHa, and SWHa of each phase and the collectors of the second upper arm switches SUHb, SVHb, and SWHb of each phase are electrically connected by a positive electrode side bus bar 11 such as a bus bar. Also, the emitters of the first lower arm switches SULa, SVLa, and SWLa of each phase and the emitters of the second lower arm switches SULb, SVLb, and SWLb of each phase are electrically connected by a negative electrode side bus bar 12 such as a bus bar.

[0017] The positive electrode terminal of the battery 10 is electrically connected to the opposite side of the connection points with the second upper arm switches SUHb, SVHb, and SWHb of each phase with respect to the connection points with the first upper arm switches SUHa, SVHa, and SWHa of each phase in the positive electrode side bus bar 11. The negative electrode terminal of the battery 10 is electrically connected to the opposite side of the connection points with the second lower arm switches SULb, SVLb, and SWLb of each phase with respect to the connection points with the first lower arm switches SULa, SVLa, and SWLa of each phase in the negative electrode side bus bar 12.

[0018] The rotating electrical machine 40 is an in-vehicle main machine. The rotor 41 of the rotating electrical machine 40 is capable of power transmission with the drive wheels 43 of the vehicle. In the present embodiment, the rotating electrical machine 40 is a permanent magnet field type synchronous machine. The rotor 41 includes permanent magnets 42 (for example, neodymium magnets) as field poles.

[0019] The rotating electrical machine 40 includes a stator 50. The stator 50 includes a U-phase winding 51U, a V-phase winding 51V, and a W-phase winding 51W as armature windings. Each phase winding 51U, 51V, and 51W is arranged with an electrical angle shift of 120° each. Each phase winding 51U, 51V, and 51W is open-connected, and both ends of each phase winding 51U, 51V, and 51W are electrically connected to the first inverter 20 or the second inverter 30.

[0020] Specifically, in each phase, the emitters of the first upper arm switches SUHa, SVHa, SWHa and the collectors of the first lower arm switches SULa, SVLa, SWLa are electrically connected to the first ends 51Ua, 51Va, 51Wa of the windings 51U, 51V, 51W. Also, in each phase, the emitters of the second upper arm switches SUHb, SVHb, SWHb and the collectors of the second lower arm switches SULb, SVLb, SWLb are electrically connected to the second ends 51Ub, 51Vb, 51Wb of the windings 51U, 51V, 51W.

[0021] The control system 100 includes a positive - side switching switch QH. The positive - side switching switch QH is provided between the first inverter 20 and the second inverter 30 in the positive - side bus 11. Specifically, the positive - side switching switch QH is provided between the connection points of the positive - side bus 11 with the first upper arm switches SUHa, SVHa, SWHa of each phase and the connection points of the positive - side bus 11 with the second upper arm switches SUHb, SVHb, SWHb of each phase. When the positive - side switching switch QH is turned on, it electrically conducts between the first inverter 20 and the second inverter 30 in the positive - side bus 11, and when it is turned off, it electrically cuts off the connection between the first inverter 20 and the second inverter 30 in the positive - side bus 11. In this embodiment, the positive - side switching switch QH is controlled by a control device 60 included in the control system 100. The positive - side switching switch QH is provided to switch the driving state of the control system 100, as will be described later.

[0022] For example, the positive - side switching switch QH is a semiconductor switching element such as an IGBT or a relay. When an IGBT is used as the positive - side switching switch QH, a free - wheel diode is connected in parallel to the positive - side switching switch QH. In this case, for the free - wheel diode connected in parallel to the positive - side switching switch QH, the anode is electrically connected to the second - inverter 30 side, and the cathode is electrically connected to the first - inverter 20 side.

[0023] The control system 100 includes a first capacitor 15a and a second capacitor 15b. The first end of the first capacitor 15a is electrically connected between the connection point of the positive electrode side bus bar 11 with each phase first upper arm switch SUHa, SVHa, SWHa and the positive electrode terminal of the battery 10. The second end of the first capacitor 15a is electrically connected between the connection point of the negative electrode side bus bar 12 with each phase first lower arm switch SULa, SVLa, SWLa and the negative electrode terminal of the battery 10. That is, the first capacitor 15a is electrically connected in parallel to the series connection of each phase first upper arm switch SUHa, SVHa, SWHa and each phase first lower arm switch SULa, SVLa, SWLa.

[0024] The first end of the second capacitor 15b is electrically connected to the opposite side of the connection point of the positive electrode side bus bar 11 with each phase second upper arm switch SUHb, SVHb, SWHb with respect to the connection point with each phase first upper arm switch SUHa, SVHa, SWHa. The second end of the second capacitor 15b is electrically connected to the opposite side of the connection point of the negative electrode side bus bar 12 with each phase second lower arm switch SULb, SVLb, SWLb with respect to the connection point with each phase first lower arm switch SULa, SVLa, SWLa. That is, the second capacitor 15b is electrically connected in parallel to the series connection of each phase second upper arm switch SUHb, SVHb, SWHb and each phase second lower arm switch SULb, SVLb, SWLb.

[0025] For example, the first capacitor 15a is an electrolytic capacitor. Also, for example, the second capacitor 15b is an electric double layer capacitor. Note that it is also possible to adopt a capacitor of a different type (for example, an electric double layer capacitor) as the first capacitor 15a instead of an electrolytic capacitor, or to adopt a capacitor of a different type (for example, an electrolytic capacitor) as the second capacitor 15b.

[0026] The control system 100 includes a positive power switch MH and a negative power switch ML. The positive power switch MH is provided between the connection point of the positive bus 11 with the first terminal of the first capacitor 15a and the battery 10. The negative power switch ML is provided between the connection point of the negative bus 12 with the second terminal of the first capacitor 15a and the battery 10. For example, each of the power switches MH and ML is a relay or a semiconductor switching element. Each of the power switches MH and ML is controlled by the control device 60.

[0027] The control system 100 includes a first resistor 16a and a second resistor 16b (corresponding to the "resistive part"). In the present embodiment, each of the resistors 16a and 16b is a discharge resistor that enables each of the capacitors 15a and 15b to discharge when each of the power switches MH and ML is turned off.

[0028] The first resistor 16a is electrically connected in parallel to the first capacitor 15a. Specifically, the first terminal of the first resistor 16a is electrically connected between the connection point of the positive bus 11 with the first terminal of the first capacitor 15a and the positive power switch MH. The second terminal of the first resistor 16a is electrically connected between the connection point of the negative bus 12 with the second terminal of the first capacitor 15a and the negative power switch ML.

[0029] Also, the second resistor 16b is electrically connected in parallel to the second capacitor 15b. Specifically, the first terminal of the second resistor 16b is electrically connected between the connection point of the positive bus 11 with each phase second upper arm switches SUHb, SVHb, SWHb and the first terminal of the second capacitor 15b. The second terminal of the second resistor 16b is electrically connected between the connection point of the negative bus 12 with each phase second lower arm switches SULb, SVLb, SWLb and the second terminal of the second capacitor 15b.

[0030] The control system 100 includes a first voltage sensor 61, a second voltage sensor 62, a current sensor 63, a rotation angle sensor 64, and an accelerator sensor 65. The first voltage sensor 61 detects the voltage of the first capacitor 15a. The second voltage sensor 62 detects the voltage of the second capacitor 15b. The current sensor 63 detects the phase currents flowing through the phase windings 51U, 51V, and 51W. In the present embodiment, the current sensor 63 is provided on the side of the first inverter 20 among both ends of each of the phase windings 51U, 51V, and 51W. Note that the current sensor 63 may be provided on the side of the second inverter 30 among both ends of each of the phase windings 51U, 51V, and 51W. The rotation angle sensor 64 is, for example, a resolver and detects the electrical angle of the rotor 41. The accelerator sensor 65 detects the accelerator operation amount Ac of the user (for example, the driver). The detection values of the respective sensors 61 to 65 are input to the control device 60.

[0031] The control device 60 is an electronic control unit (ECU: Electronic Control Unit) that performs various controls of the control system 100, and includes a processor 60a and a storage unit 60b as hardware. In the control system 100, each in-vehicle device can be controlled by an ECU corresponding to each in-vehicle device. However, in FIG. 1, for convenience, a plurality of ECUs are shown as one control device 60.

[0032] The storage unit 60b includes a memory and a storage as hardware. The memory is a storage device for storing data used in the processing of the control device 60. The memory provides, for example, a work area for temporary use by the processor 60a when the processor 60a performs processing. The memory includes, for example, a ROM or a RAM. The storage is a storage device for storing various programs and data to be read and executed by the processor 60a, and is a non-transitory tangible storage medium. The storage includes, for example, an HDD or a flash memory. Program information and the like for the processing of FIGS. 2, 5, 10, etc. described later are stored in the storage.

[0033] Note that, for example, program information stored in a non-transitory tangible recording medium is installed in the storage unit 60b. The recording medium is, for example, a USB memory, a CD-ROM, or a DVD. Also, for example, program information transmitted via a communication network such as OTA (Over The Air) is installed in the storage unit 60b.

[0034] In order to control the control amount of the rotating electrical machine 40 to the command value, the control device 60 controls the on or off of the positive electrode side switching switch QH, each switch SUHa to SWLa of the first inverter 20, and each switch SUHb to SWLb of the second inverter 30 in a state where each power switch MH, ML is turned on. In the present embodiment, the control amount is torque.

[0035] Hereinafter, with reference to FIG. 2, the torque control of the rotating electrical machine 40 executed by the control device 60 will be described. The control device 60 includes a current command generation unit 80, a dq conversion unit 81, d-axis and q-axis deviation calculation units 82d and 82q, a current control unit 83, a UVW conversion unit 84, a speed calculation unit 85, a selection unit 86, and a modulation unit 87.

[0036] Based on the torque command value Trq* received from a control device higher than the control device 60, the current command generation unit 80 calculates a d-axis current command value Id* and a q-axis current command value Iq* in the dq coordinate system. The current command generation unit 80 inputs the calculated d-axis current command value Id* to the d-axis deviation calculation unit 82d. The current command generation unit 80 inputs the calculated q-axis current command value Iq* to the q-axis deviation calculation unit 82q.

[0037] Based on each phase current Iur, Ivr, Iwr detected by the current sensor 63 and the electrical angle θr detected by the rotation angle sensor 64, the dq conversion unit 81 calculates a d-axis current value Idr and a q-axis current value Iqr. The dq conversion unit 81 inputs the calculated d-axis current value Idr to the d-axis deviation calculation unit 82d. The dq conversion unit 81 inputs the calculated q-axis current value Iqr to the q-axis deviation calculation unit 82q.

[0038] The d-axis deviation calculation unit 82d calculates a d-axis current deviation, which is the difference between the input d-axis current command value Id* and the d-axis current value Idr. The q-axis deviation calculation unit 82q calculates a q-axis current deviation, which is the difference between the input q-axis current command value Iq* and the q-axis current value Iqr. Each deviation calculation unit 82d, 82q inputs the calculated d- and q-axis current deviations to the current control unit 83.

[0039] The current control unit 83 calculates a d-axis voltage command value Vd* as an operation amount for feedback control to make the input d-axis current deviation zero. The current control unit 83 calculates a q-axis voltage command value Vq* as an operation amount for feedback control to make the input q-axis current deviation zero. The current control unit 83 inputs the calculated d- and q-axis voltage command values Vd*, Vq* to the UVW conversion unit 84.

[0040] The UVW conversion unit 84 calculates U, V, W phase voltage command values Vu*, Vv*, Vw* based on the input d- and q-axis voltage command values Vd*, Vq* and the electrical angle θr. Each phase voltage command value Vu*, Vv*, Vw* is a command value for the applied voltage of the U, V, W phase windings 51U, 51V, 51W. The U, V, W phase voltage command values Vu*, Vv*, Vw* are shifted in phase by 120° at the electrical angle. In this embodiment, the sign of the applied voltage of each phase winding is positive when the potential of the first end 51Ua, 51Va, 51Wa is higher than that of the second end 51Ub, 51Vb, 51Wb of the windings 51U, 51V, 51W, and negative when the potential of the second end 51Ub, 51Vb, 51Wb is higher than that of the first end 51Ua, 51Va, 51Wa of the windings 51U, 51V, 51W. The UVW conversion unit 84 inputs the calculated phase voltage command values Vu*, Vv*, Vw* to the modulation unit 87.

[0041] The speed calculation unit 85 calculates the rotational speed Nr of the rotor 41 based on the electrical angle θr. The speed calculation unit 85 inputs the calculated rotational speed Nr to the selection unit 86.

[0042] The selection unit 86 determines whether the control system 100 should perform either Y drive control or H drive control. In the present embodiment, the selection unit 86 selects whether to perform either Y drive control or H drive control based on the operating point of the rotating electrical machine 40 determined by the input rotational speed Nr and torque command value Trq*, and the control map information. The control map information is information in which regions of Y drive control and H drive control are defined in association with the rotational speed Nr and torque command value Trq*, and is stored in the storage unit 60b.

[0043] The modulation unit 87 generates a carrier signal for generating drive signals for the switches SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30. For example, the carrier signal is a triangular wave signal. The drive signals consist of on commands and off commands for the switches.

[0044] The modulation unit 87 generates drive signals for the switches SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30 based on the input phase voltage command values Vu*, Vv*, Vw*, the first detected voltage V1r which is the voltage detected by the first voltage sensor 61, and the generated carrier signal.

[0045] Specifically, the modulation unit 87 calculates U, V, W phase normalized command values Dutyu, Dutyv, Dutyw obtained by normalizing the U, V, W phase voltage command values Vu*, Vv*, Vw* with the first detected voltage V1r. Specifically, the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw are values obtained by dividing the U, V, W phase voltage command values Vu*, Vv*, Vw* by 1 / 2 of the first detected voltage V1r.

[0046] When the H drive control is selected by the selection unit 86, the modulation unit 87, as the H drive control, as shown in FIG. 3, turns on the positive-pole side switching switch QH, PWM drives each switch SUHa to SWLa of the first inverter 20, and PWM drives each switch SUHb to SWLb of the second inverter 30. The modulation unit 87 generates drive signals for each switch SUHa to SWLa and SUHb to SWLb of the first and second inverters 20 and 30 based on the magnitude comparison between the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw and the carrier signal.

[0047] On the other hand, when the Y drive control is selected by the selection unit 86, the modulation unit 87, as the Y drive control, as shown in FIG. 4, turns off the positive-pole side switching switch QH and performs control to PWM drive each switch SUHa to SWLa of the first inverter 20. Also, each phase second upper arm switch SUHb, SVHb, SWHb is fixed on, and each phase second lower arm switch SULb, SVLb, SWLb is fixed off. Thereby, each phase winding 51U, 51V, 51W is star-connected via the second inverter 30. The modulation unit 87 generates drive signals for each switch SUHa to SWLa of the first inverter 20 based on the magnitude comparison between the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw and the carrier signal.

[0048] Based on the generated drive signals, the modulation unit 87 controls the charge and discharge currents of the gates of each switch SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30. Thereby, according to the drive signals, the on or off of each switch SUHa to SWLa and SUHb to SWLb of the first and second inverters 20 and 30 is controlled.

[0049] In the H drive control, the switching patterns of the switches SWHa to SWLa and SWHb to SWLb that are switched according to the drive signal are shifted in phase by 120° in electrical angle in each phase. Also, in the Y drive control, the switching patterns of the switches SWHa to SWLa in the first inverter 20 that are switched according to the drive signal are shifted in phase by 120° in electrical angle in each phase.

[0050] Fig. 5 shows a flowchart of the control executed by the control device 60. The process shown in Fig. 5 is repeatedly executed by the processor 60a of the control device 60, for example, at a predetermined control cycle.

[0051] In step S10, the selection unit 86 acquires the torque command value Trq* and the rotational speed Nr calculated by the speed calculation unit 85.

[0052] In step S11, the selection unit 86 selects either Y drive control or H drive control based on the torque command value Trq* and the rotational speed Nr.

[0053] When Y drive control is selected in step S11, the process proceeds to step S13, and the modulation unit 87 executes the Y drive control shown in Fig. 4 above. On the other hand, when H drive control is selected in step S11, the process proceeds to step S14, and the modulation unit 87 executes the H drive control shown in Fig. 3 above.

[0054] Incidentally, after the drive of the rotating electrical machine 40 is temporarily stopped, a situation may occur where the drive of the rotating electrical machine 40 is restarted. In this case, due to a difference between the voltage VC2 of the second capacitor 15b that has decreased during the drive stop of the rotating electrical machine 40 and the voltage applied to the second capacitor 15b accompanying the restart of the drive of the rotating electrical machine 40, there is a concern that an unintended current may flow through the control system 100.

[0055] Here, as shown in FIG. 6, a comparative example is described in which the Y drive control is temporarily stopped at time t1 and the implementation of the Y drive control is resumed at time t2. In FIG. 6, (a) shows the transition of the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw, (b) shows the transition of the V7 ratio described later, (c) shows the transition of the voltage VC2 of the second capacitor 15b, and (d) shows the transition of the current IC2 flowing through the second capacitor 15b.

[0056] During the implementation of the Y drive control, the control device 60 performs switching control of the first inverter 20 based on the respective phase normalized command values Dutyu, Dutyv, Dutyw. The first inverter 20 can output the 0th, 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th output voltages V0, V1, V2, V3, V4, V5, V6, V7 in the switching control. The 0th output voltage V0 is the voltage output during the period when the first lower arm switches SULa, SVLa, SWLa of each phase are turned on and the first upper arm switches SUHa, SVHa, SWHa of each phase are turned off. The 7th output voltage V7 is the voltage output during the period when the first upper arm switches SUHa, SVHa, SWHa of each phase are turned on and the first lower arm switches SULa, SVLa, SWLa of each phase are turned off.

[0057] Note that FIG. 7 shows the switches that are turned on during the output periods of the 0th to 7th output voltages V0 to V7. In each phase, the switches of the arm opposite to the switches shown in FIG. 7 are turned off. Each of the output voltages V0 to V7 is also a space vector that represents the voltage applied to the U, V, W phase windings 51U, 51V, 51W by a vector, and is also referred to as an output voltage vector.

[0058] The modulation unit 87 generates a drive signal for outputting the 7th output voltage V7 during the period when the respective phase normalized command values Dutyu, Dutyv, Dutyw exceed the carrier signal. Therefore, the higher the respective phase normalized command values Dutyu, Dutyv, Dutyw are, the longer the output period of the 7th output voltage V7 in one switching cycle of the switching control becomes.

[0059] During the period when each phase normalized command value Dutyu, Dutyv, Dutyw is below the carrier signal, the modulation unit 87 generates a drive signal for outputting the first output voltage V0. Therefore, the lower each phase normalized command value Dutyu, Dutyv, Dutyw is, the longer the output period of the first output voltage V0 in one switching cycle of the switching control becomes.

[0060] In the state where the positive electrode side switching switch QH is turned off, the higher the V7 ratio correlated with the length of the output period of the seventh output voltage V7 during the execution of the Y drive control, the closer the voltage VC2 of the second capacitor 15b approaches the voltage value VB of the battery 10. Specifically, the V7 ratio is the ratio of the output period of the seventh output voltage V7 to the total of the output periods of the first and seventh output voltages V0, V7 in one switching cycle. FIG. 6 shows the transition of the voltage VC2 in the second capacitor 15b when the V7 ratio is in the vicinity of 50%.

[0061] When the Y drive control is temporarily stopped, the positive electrode side switching switch QH and each switch SUHa~SWLa, SUHb~SWLb are turned off. In this case, as shown in FIG. 8, a current flows through the closed circuit including the second capacitor 15b and the second resistor 16b, and the second capacitor 15b is discharged. As a result, during the stop of the Y drive control, the voltage of the second capacitor 15b decreases. In FIG. 6, the voltage VC2 of the second capacitor 15b decreases from the average value VC2a of the voltage applied when the V7 ratio is in the vicinity of 50% to a value VC2b lower than the average value VC2a. Here, the average value VC2a is VB / 2.

[0062] Note that even when the control device 60 temporarily stops the H drive control, in addition to turning off each switch SUHa~SWLa, SUHb~SWLb, the positive electrode side switching switch QH may be turned off. In this case, similar to the case where the Y drive control is stopped, a current flows through the closed circuit including the second capacitor 15b and the second resistor 16b, and the second capacitor 15b is discharged.

[0063] When the control device 60 resumes the implementation of the Y drive control, for example, it performs switching control at the same V7 ratio as before the stop of the Y drive control. In this case, the same voltage as before the stop of the Y drive control is applied to the second capacitor 15b. At this time, as shown in FIG. 6, due to the sharp increase in the voltage VC2 of the second capacitor 15b from VC2b to VC2a, there is a concern that an inrush current will flow through the second capacitor 15b. In this case, for example, there is a concern that an overcurrent will flow through the components constituting the control system 100 such as the switches SUHa to SWLa, SUHb to SWLb, QH and the capacitors 15a, 15b. Also, for example, there is a concern that an unintended torque will be generated on the drive wheels 43 due to an unintended current flowing through each phase winding 51U, 51V, 51W.

[0064] Therefore, in the present embodiment, the control device 60 performs a correction process for correcting the switching pattern of the switching control when the driving of the rotating electrical machine 40 is resumed by the Y drive control. Hereinafter, the configuration for implementing the correction process will be described.

[0065] Returning to the description of FIG. 2, the control device 60 includes a determination unit 90, an acquisition unit 91, and a correction unit 92. The determination unit 90 determines whether or not it is in a rest mode in which the rotation electrical machine 40 is stopped while the positive electrode side switching switch QH is off. In other words, the determination unit 90 determines that it is in the rest mode when it determines that the positive electrode side switching switch QH is off and the rotation electrical machine 40 is stopped. When the determination unit 90 determines that the positive electrode side switching switch QH is on, and when it determines that the rotation electrical machine 40 is in operation, it determines that it is in the operation mode in at least one of these cases.

[0066] For example, when the Y drive control is selected by the selection unit 86, the determination unit 90 determines that the positive electrode side switching switch QH is off. Also, for example, when the H drive control is selected by the selection unit 86, the determination unit 90 determines that the positive electrode side switching switch QH is on.

[0067] For example, when the determination unit 90 determines that the accelerator operation amount Ac detected by the accelerator sensor 65 is equal to or less than the operation amount determination value near 0, it determines that the rotation electric machine 40 is in a drive stop state, and when it determines that the accelerator operation amount Ac is higher than the operation amount determination value, it determines that the rotation electric machine 40 is in a driving state. Further, for example, when the determination unit 90 determines that the torque command value Trq* is equal to or less than the torque determination value near 0, it determines that the rotation electric machine 40 is in a drive stop state, and when it determines that the torque command value Trq* is higher than the torque determination value, it determines that the rotation electric machine 40 is in a driving state.

[0068] Note that the determination unit 90 may determine that it is in the rest mode on the condition that both the determination condition that the accelerator operation amount Ac is equal to or less than the operation amount determination value and the determination condition that the torque command value Trq* is equal to or less than the torque determination value are satisfied in a state where the positive electrode side switching switch QH is turned off. The determination condition for being in the rest mode described above may be satisfied not only when the vehicle is stopped but also when the vehicle is traveling at a low speed.

[0069] When the determination unit 90 determines that it is in the rest mode, it determines whether the driving of the rotation electric machine 40 is restarted by Y drive control. For example, when the determination unit 90 determines that Y drive control is selected by the selection unit 86 and determines that the torque command value Trq* is higher than the torque determination value, it determines that the driving of the rotation electric machine 40 is restarted by Y drive control. For example, when the determination unit 90 determines that the torque command value Trq* is equal to or less than the torque determination value, it determines that the rest mode continues.

[0070] Further, for example, when the determination unit 90 determines that Y drive control is selected by the selection unit 86 and determines that the accelerator operation amount Ac is higher than the operation amount determination value, it determines that the driving of the rotation electric machine 40 is restarted by Y drive control. For example, when the determination unit 90 determines that the accelerator operation amount Ac is equal to or less than the operation amount determination value, it determines that the rest mode continues.

[0071] Note that the determination unit 90 may determine that the driving of the rotating electrical machine 40 is restarted by the Y drive control on the condition that the determination that the Y drive control is selected by the selection unit 86, the determination condition that the accelerator operation amount Ac is higher than the operation amount determination value, and the determination condition that the torque command value Trq* is higher than the torque determination value are satisfied.

[0072] The determination unit 90 inputs the notification signal Sg to the acquisition unit 91. The notification signal Sg is a signal for notifying whether or not to perform the correction process. The notification signal Sg is a binary signal, and notifies that the correction process is to be performed by logic H and notifies that the correction process is not to be performed by logic L. When the determination unit 90 determines that the driving of the rotating electrical machine 40 is restarted by the Y drive control, it inputs the notification signal Sg of logic H to the acquisition unit 91. On the other hand, when the determination unit 90 determines that it is in the operation mode or determines that the stop mode continues, it inputs the notification signal Sg of logic L to the acquisition unit 91.

[0073] When the acquisition unit 91 receives the notification signal Sg of logic H, it acquires the detected voltage V2r of the second voltage sensor 62. In other words, the acquisition unit 91 acquires the detected voltage V2r immediately before the restart of the driving of the rotating electrical machine 40. The acquisition unit 91 inputs the acquired detected voltage V2r to the correction unit 92. In the present embodiment, the detected voltage V2r of the second capacitor 15b corresponds to the "voltage state".

[0074] Based on the acquired detected voltage V2r, the correction unit 92 calculates a voltage correction value Vuvw so as to bring the voltage applied to the second capacitor 15b close to the current voltage of the second capacitor 15b with the restart of the driving of the rotating electrical machine 40 by the Y drive control. The voltage correction value Vuvw is a value for correcting each phase voltage command value Vu*, Vv*, Vw*. The correction unit 92 inputs the calculated voltage correction value Vuvw to the modulation unit 87.

[0075] The modulation unit 87 corrects each phase voltage command value Vu*, Vv*, Vw* based on the input voltage correction value Vuvw. In the present embodiment, the modulation unit 87 performs correction by adding the voltage correction value Vuvw to the voltage command values Vu*, Vv*, Vw* for each phase. The modulation unit 87 calculates each phase normalized command value Dutyu, Dutyv, Dutyw based on the corrected phase voltage command values Vu*, Vv*, Vw* and the first detected voltage V1r. As a result, the switching pattern of the switching control performed in the Y drive control is corrected. Specifically, each phase normalized command value Dutyu, Dutyv, Dutyw is offset, and the output periods of the 0th and 7th output voltages V0, V7 in one switching period of the switching control are adjusted.

[0076] The correction unit 92 calculates the voltage correction value Vuvw such that the lower the acquired detected voltage V2r is, the lower the V7 ratio becomes. Fig. 9 shows the relationship among the acquired detected voltage V2r, each phase normalized command value Dutyu, Dutyv, Dutyw corrected based on the voltage correction value Vuvw, and the V7 ratio. The correction unit 92 calculates the voltage correction value Vuvw so as to realize a V7 ratio such that the voltage applied to the second capacitor 15b is close to the detected voltage V2r when the rotation motor 40 is restarted under Y drive control.

[0077] In the present embodiment, by performing the above-described correction process, the lower the acquired detected voltage V2r is, the lower each phase normalized command value Dutyu, Dutyv, Dutyw becomes. In other words, the lower the acquired detected voltage V2r is, the switching pattern of the switching control is corrected so that the V7 ratio at the time of restarting the rotation motor 40 under Y drive control becomes lower. Therefore, it is possible to adjust the voltage applied to the second capacitor 15b at the time of restarting the rotation motor 40 to be close to the current voltage VC2 of the second capacitor 15b. As a result, the correction process can be appropriately performed.

[0078] FIG. 10 shows the processing procedure of the control executed by the control device 60. The control shown in FIG. 10 is repeatedly executed by the processor 60a of the control device 60, for example, at a predetermined control cycle.

[0079] In step S20, the determination unit 90 determines whether it is in the sleep mode. If a negative determination is made in step S20, the notification signal Sg of logic L is input to the acquisition unit 91. Then, without executing the processes of steps S21 to S23, the process proceeds to step S24. In step S24, torque control is performed. In this case, in the modulation unit 87, torque control is performed based on the generated drive signal. On the other hand, if an affirmative determination is made in step S20, the process proceeds to step S21.

[0080] In step S21, the determination unit 90 determines whether the driving of the rotating electric machine 40 is restarted by Y drive control. If a negative determination is made in step S21, the notification signal Sg of logic L is input to the acquisition unit 91, and this control is terminated. On the other hand, if an affirmative determination is made in step S21, the notification signal Sg of logic H is input to the acquisition unit 91, and the process proceeds to step S22. Note that the determination unit 90 corresponds to the "sleep determination unit" and the "drive determination unit".

[0081] In step S22, the acquisition unit 91 acquires the voltage state of the second capacitor 15b. In the present embodiment, the detected voltage V2r of the second voltage sensor 62 is acquired.

[0082] In step S23, the modulation unit 87 and the correction unit 92 perform the following processes as correction processes. In the correction unit 92, a voltage correction value Vuvw is calculated based on the acquired detected voltage V2r. In the modulation unit 87, the phase voltage command values Vu*, Vv*, and Vw* are corrected based on the calculated voltage correction value Vuvw. Then, in the modulation unit 87, the phase normalized command values Dutyu, Dutyv, and Dutyw are calculated based on the corrected phase voltage command values Vu*, Vv*, and Vw*. Then, the process proceeds to step S24.

[0083] Next, with reference to FIG. 11, the effects when the above-described control is executed will be described. Here, similar to FIG. 6 above, a situation is assumed in which the implementation of the Y drive control is resumed after the Y drive control is temporarily stopped. (a) to (d) of FIG. 11 correspond to (a) to (d) of FIG. 6 above. Since the description up to time t2 is the same as that in FIG. 6 above, detailed description will be omitted.

[0084] At time t2, the determination unit 90 determines that the driving of the rotating electric machine 40 is resumed by the Y drive control. In this case, the determination unit 90 inputs a notification signal Sg of logic H to the acquisition unit 91. The acquisition unit 91, the correction unit 92, and the modulation unit 87 perform the above-described correction process. The modulation unit 87 performs switching control of each phase first upper arm switch SUHa, SVHa, SWHa and each phase first lower arm switch SULa, SVLa, SWLa based on the offset-corrected phase normalized command values Dutyu, Dutyv, Dutyw. Thereby, it becomes possible to perform switching control so that the voltage VC2 applied to the second capacitor 15b as the driving of the rotating electric machine 40 is resumed approaches the current voltage VC2 of the second capacitor 15b. Therefore, it is possible to suppress a difference between the voltage VC2 of the second capacitor 15b that has decreased during the standby mode and the voltage applied to the second capacitor 15b as the driving of the rotating electric machine 40 is resumed. As a result, it is possible to suppress an unintended current from flowing through the control system 100 when the Y drive control is resumed.

[0085] <Second Embodiment> Instead of the positive - side switching switch QH, the control system 100 may be provided with a negative - side switching switch QL as shown in FIG. 12. The negative - side switching switch QL may be provided between the first inverter 20 and the second inverter 30 in the negative - side bus 12. Specifically, the negative - side switching switch QL may be provided between the connection points of the negative - side bus 12 with each - phase first lower - arm switches SULa, SVLa, SWLa and the connection points of the negative - side bus 12 with each - phase second lower - arm switches SULb, SVLb, SWLb. The negative - side switching switch QL may electrically connect the first inverter 20 and the second inverter 30 when it is turned on, and electrically disconnect the first inverter 20 and the second inverter 30 when it is turned off. The control device 60 may control the negative - side switching switch QL.

[0086] For example, the negative - side switching switch QL is a semiconductor switching element such as an IGBT or a relay. When an IGBT is used as the negative - side switching switch QL, a free - wheel diode is connected in parallel to the negative - side switching switch QL. In this case, for the free - wheel diode connected in parallel to the negative - side switching switch QL, the anode is electrically connected to the first - inverter 20 side, and the cathode is electrically connected to the second - inverter 30 side.

[0087] When Y - drive control is selected by the selection unit 86, the modulation unit 87, as Y - drive control, turns off the negative - side switching switch QL and performs control to PWM - drive each switch SUHa~SWLa of the first inverter 20. Also, each - phase second lower - arm switches SULb, SVLb, SWLb are fixed on, and each - phase second upper - arm switches SUHb, SVHb, SWHb are fixed off.

[0088] In the above - described configuration, the control device 60 can perform correction processing. Specifically, similar to the first embodiment, when the notification signal Sg of logic H is input, the acquisition unit 91 acquires the detected voltage V2r of the second voltage sensor 62. The correction unit 92 calculates the voltage correction value Vuvw based on the acquired detected voltage V2r.

[0089] When the negative - side switching switch QL is turned off, the higher the V0 ratio, which correlates with the length of the output period of the first output voltage V0 during the implementation of Y - drive control, the closer the voltage VC2 of the second capacitor 15b approaches the voltage value VB of the battery 10. The V0 ratio is the ratio of the output period of the first output voltage V0 to the total of the output periods of the first and seventh output voltages V0 and V7 in one switching period.

[0090] Therefore, in this embodiment, the correction unit 92 may calculate the voltage correction value Vuvw such that the higher the detected voltage V2r obtained is, the higher the phase - normalization command values Dutyu, Dutyv, and Dutyw become. In this case, the V0 ratio at the time of restarting the drive of the rotating electrical machine 40 by Y - drive control is reduced. As a result, it becomes possible to adjust the voltage applied to the second capacitor 15b at the time of restarting the drive of the rotating electrical machine 40 to be close to the current voltage VC2 of the second capacitor 15b. Therefore, the correction process can be appropriately performed.

[0091] <Other Embodiments> In addition, each of the above embodiments may be implemented with the following modifications.

[0092] · In step S22 of FIG. 10 above, in the acquisition unit 91, instead of the detected voltage V2r of the second voltage sensor 62, the elapsed time since it was determined that the system is in the standby mode may be acquired as the voltage state of the second capacitor 15b. In this case, in the first embodiment, the correction unit 92 may calculate the voltage correction value Vuvw such that the longer the acquired elapsed time is, the lower the V7 ratio becomes. Also, in the second embodiment, the correction unit 92 may calculate the voltage correction value Vuvw such that the longer the acquired elapsed time is, the lower the V0 ratio becomes. In this embodiment, the correction process can be appropriately performed based on the elapsed time since it was determined that the system is in the standby mode.

[0093] · The control system 100 may include a positive - side switching switch QH and a negative - side switching switch QL.

[0094] In each of the above embodiments, instead of PWM driving based on the comparison of the command value and the carrier signal, the modulation unit 87 may perform PWM driving based on space vector modulation.

[0095] · The resistance part is not limited to the discharge resistor, and may be a parasitic resistance existing between the respective buses 11 and 12.

[0096] · The DC power source is not limited to the battery, and may be, for example, a fuel cell.

[0097] · The rotating electrical machine is not limited to a three-phase one, and may be a two-phase one or a four-phase or more one.

[0098] · The semiconductor switches constituting the first inverter and the second inverter are not limited to IGBTs, and may be, for example, N-channel MOSFETs. In this case, the high-potential side terminal of the switch is the drain, and the low-potential side terminal is the source. Also, each switch has a body diode.

[0099] · The mounting destinations of the inverter, the rotating electrical machine, and the control device are not limited to vehicles, and may be, for example, moving bodies such as aircraft or ships. When the moving body is an aircraft, the rotating electrical machine becomes the flight power source of the aircraft, and when the moving body is a ship, the rotating electrical machine becomes the navigation power source of the ship. Also, the mounting destinations of the inverter, the rotating electrical machine, and the control device are not limited to moving bodies.

[0100] · The control device and its method described in the present disclosure may be implemented by a dedicated computer configured by a processor and a memory programmed to execute one or more functions embodied by a computer program. Alternatively, the control device and its method described in the present disclosure may be implemented by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits. Or, the control device and its method described in the present disclosure may be implemented by one or more dedicated computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured by one or more hardware logic circuits. Further, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executable by a computer.

Explanation of Signs

[0101] 10… Battery, 11… Positive electrode side busbar, 12… Negative electrode side busbar, 15b… Second capacitor, 16b… Second resistor, 20, 30… First, second inverters, 40… Rotating electric machine, 51U, 51V, 51W… U, V, W phase windings, 60… Control device, 87… Modulation unit, 90… Determination unit, 91… Acquisition unit, 92… Correction unit, 100… Control system, QH, QL… Positive electrode side, negative electrode side switching switches.

Claims

1. A rotating electrical machine (40) having windings (51U, 51V, 51W) of multiple phases, A first inverter (20) having as many first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SUL a, SVL a, SWL a) connected in series as the number of phases, and a series connection of the first upper arm switch and the first lower arm switch being connected in parallel to a DC power supply (10), A second inverter (30) having as many second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb) connected in series as the number of phases, and a series connection of the second upper arm switch and the second lower arm switch being connected in parallel to a capacitor, In each phase, a positive bus bar (11) electrically connecting the high-potential side terminals of the first upper arm switch and the high-potential side terminals of the second upper arm switch, In each phase, a negative bus bar (12) electrically connecting the low-potential side terminals of the first lower arm switch and the low-potential side terminals of the second lower arm switch, A switching switch (QH, QL) provided on at least one of the positive bus bar and the negative bus bar, A control device for a rotating electrical machine applied to a system (100) comprising: In each phase, the low-potential side terminals of the first upper arm switch and the high-potential side terminals of the first lower arm switch are electrically connected to the first end of the winding, In each phase, the low-potential side terminals of the second upper arm switch and the high-potential side terminals of the second lower arm switch are electrically connected to the second end of the winding, A control unit (87) that controls the rotating electrical machine by fixing one of the second upper arm switch and the second lower arm switch to on and the other to off and performing switching control of the first upper arm switch and the first lower arm switch while the switching switch is off, A rest determination unit (90) that determines whether or not the rotating electrical machine is in a rest mode in which driving is stopped while the switching switch is off, A drive determination unit (90) that determines whether or not driving of the rotating electrical machine is to be restarted while the switching switch is off when it is determined that the rotating electrical machine is in the rest mode, An acquisition unit (91) that acquires the voltage state of the capacitor when it is determined that driving of the rotating electrical machine is to be restarted, Based on the obtained voltage state, a correction unit (92) corrects the switching pattern of the switching control so that the voltage applied to the capacitor as the rotating electrical machine resumes driving approaches the current voltage of the capacitor. A control device for a rotating electrical machine, comprising the above. **Claim 2** The changeover switch is provided at least on the positive electrode side bus among the positive electrode side bus and the negative electrode side bus. The acquisition unit acquires the detected voltage of a voltage sensor that detects the voltage of the capacitor as the voltage state. The correction unit corrects the switching pattern of the switching control such that the period during which the first upper arm switch of each phase is turned on in one switching period becomes shorter in the switching control executed with the changeover switch provided on the positive electrode side bus turned off, as the obtained detected voltage is lower. The control device for a rotating electrical machine according to claim 1. **Claim 3** The changeover switch is provided at least on the negative electrode side bus among the positive electrode side bus and the negative electrode side bus. The acquisition unit acquires the detected voltage of a voltage sensor that detects the voltage of the capacitor as the voltage state. The correction unit corrects the switching pattern of the switching control such that the period during which the first lower arm switch of each phase is turned on in one switching period becomes shorter in the switching control executed with the changeover switch provided on the negative electrode side bus turned off, as the obtained detected voltage is lower. The control device for a rotating electrical machine according to claim 1. **Claim 4** The changeover switch is provided at least on the positive electrode side bus among the positive electrode side bus and the negative electrode side bus. The acquisition unit acquires the elapsed time since it was determined that the machine is in the stop mode as the voltage state. The correction unit corrects the switching pattern of the switching control such that the period during which the first upper arm switch of each phase is turned on in one switching period becomes shorter in the switching control executed with the changeover switch provided on the positive electrode side bus turned off, as the obtained elapsed time is longer. The control device for a rotating electrical machine according to claim 1. **Claim 5** The changeover switch is provided at least on the negative electrode side bus among the positive electrode side bus and the negative electrode side bus. The acquisition unit acquires the elapsed time since it was determined that the standby mode is in effect, as the voltage state. The correction unit corrects the switching pattern of the switching control such that, in the switching control executed with the switching switch provided on the positive electrode side busbar turned off, the period during which each phase's first lower arm switch is turned on in one switching cycle becomes shorter as the acquired elapsed time becomes longer. The control device for a rotating electrical machine according to claim 1.

6. A rotating electrical machine (40) having windings (51U, 51V, 51W) of a plurality of phases, A first inverter (20) having, for the number of phases, a first upper arm switch (SUHa, SVHa, SWHa) and a first lower arm switch (SULa, SVLa, SWLa) connected in series, and a series connection of the first upper arm switch and the first lower arm switch being connected in parallel to a DC power supply (10); A second inverter (30) having, for the number of phases, a second upper arm switch (SUHb, SVHb, SWHb) and a second lower arm switch (SULb, SVLb, SWLb) connected in series, and a series connection of the second upper arm switch and the second lower arm switch being connected in parallel to a capacitor; A positive electrode side busbar (11) that electrically connects the high potential side terminals of the first upper arm switches and the high potential side terminals of the second upper arm switches in each phase; A negative electrode side busbar (12) that electrically connects the low potential side terminals of the first lower arm switches and the low potential side terminals of the second lower arm switches in each phase; A switching switch (QH, QL) provided on at least one of the positive electrode side busbar and the negative electrode side busbar; A program applied to a system (100) including: In each phase, the low potential side terminal of the first upper arm switch and the high potential side terminal of the first lower arm switch are electrically connected to the first end of the winding; In each phase, the low potential side terminal of the second upper arm switch and the high potential side terminal of the second lower arm switch are electrically connected to the second end of the winding; To a processor (60a), A process of controlling the rotating electrical machine by performing switching control of the first upper arm switch and the first lower arm switch while fixing one of the second upper arm switch and the second lower arm switch to on and the other to off with the switching switch turned off. A rest determination process for determining whether or not it is in a rest mode in which the rotation electric machine is stopped from driving while the changeover switch is turned off; A drive determination process for determining whether or not the drive of the rotation electric machine is restarted while the changeover switch is turned off when it is determined that it is in the rest mode; An acquisition process for acquiring the voltage state of the capacitor when it is determined that the drive of the rotation electric machine is restarted; A correction process for correcting the switching pattern of the switching control so that the voltage applied to the capacitor with the restart of the drive of the rotation electric machine approaches the current voltage of the capacitor based on the acquired voltage state; A program for causing the above to be executed.

7. A rotation electric machine (40) having a plurality of phase windings (51U, 51V, 51W); A first inverter (20) having a number of first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SULa, SVLa, SWLa) connected in series corresponding to the number of phases, and the series connection of the first upper arm switch and the first lower arm switch being connected in parallel to a DC power supply (10); A second inverter (30) having a number of second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb) connected in series corresponding to the number of phases, and the series connection of the second upper arm switch and the second lower arm switch being connected in parallel to a capacitor; A positive electrode side bus bar (11) for electrically connecting the high potential side terminals of the first upper arm switches and the high potential side terminals of the second upper arm switches in each phase; A negative electrode side bus bar (12) for electrically connecting the low potential side terminals of the first lower arm switches and the low potential side terminals of the second lower arm switches in each phase; A changeover switch (QH, QL) provided on at least one of the positive electrode side bus bar and the negative electrode side bus bar; A control method for a rotation electric machine applied to a system (100) including: In each phase, the low potential side terminal of the first upper arm switch and the high potential side terminal of the first lower arm switch are electrically connected to the first end of the winding; In each phase, the low potential side terminal of the second upper arm switch and the high potential side terminal of the second lower arm switch are electrically connected to the second end of the winding; In a state where the changeover switch is turned off, while fixing one of the second upper arm switch and the second lower arm switch to be on and the other to be off, and performing switching control of the first upper arm switch and the first lower arm switch, a process of controlling the rotating electrical machine; A pause determination process of determining whether or not the rotating electrical machine is in a pause mode in which driving is stopped in a state where the changeover switch is turned off; A drive determination process of determining whether or not the driving of the rotating electrical machine is restarted in a state where the changeover switch is turned off when it is determined that the rotating electrical machine is in the pause mode; An acquisition process of acquiring the voltage state of the capacitor when it is determined that the driving of the rotating electrical machine is restarted; A correction process of correcting the switching pattern of the switching control so that the voltage applied to the capacitor with the restart of the driving of the rotating electrical machine approaches the current voltage of the capacitor based on the acquired voltage state; A control method for a rotating electrical machine, including the above.

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