US 11,749,981 B2
Control device for AC rotating machine, electric braking device for vehicle, and control method for AC rotating machine
Ryo Shinohara, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Sep. 27, 2021, as Appl. No. 17/485,721.
Claims priority of application No. 2020-189091 (JP), filed on Nov. 13, 2020.
Prior Publication US 2022/0158441 A1, May 19, 2022
Int. Cl. H02H 7/08 (2006.01); H02H 1/00 (2006.01); H02P 27/06 (2006.01)
CPC H02H 7/0822 (2013.01) [H02H 1/0007 (2013.01); H02P 27/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A control device for an AC rotating machine, for controlling an AC rotating machine including windings of a plurality of systems, the control device comprising:
a plurality of inverters for controlling voltages to be applied to the windings of the systems, respectively;
a plurality of switches for switching between connection and blocking of a circuit between the windings and the inverter in each of the systems;
a processor for executing a program; and
a storage device in which the program is stored, wherein
the following operation is performed by the program executed by the processor,
controlling the plurality of inverters and the plurality of switches;
detecting an abnormality in each of the systems, wherein
when an abnormality has been detected in at least one of the systems, the processor causes the switches to block the circuit between the windings and the inverter in the system in which the abnormality has been detected, and continues normal control in a system other than the system in which the abnormality has been detected,
wherein the program executed by the processor further determines whether it is possible to block the circuit between the windings and the inverter by the switches, wherein
the program executed by the processor detects an abnormality in each of the systems by detecting whether an abnormality has occurred in any switching element of the inverter for each of the systems, and
when it is determined that it is impossible to block the circuit between the windings and the inverter by the switches in the system in which the abnormality has been detected, the program executed by the processor turns on all switching elements on a positive electrode side of the inverter for the system in which the abnormality has been detected and turns off all switching elements on a negative electrode side of said inverter, or turns off all the switching elements on the positive electrode side and turns on all the switching elements on the negative electrode side, with the circuit kept connected between the windings and the inverter in the system in which the abnormality has been detected.