Patent ID: 9673747
Date: 2017-06-06
CPC Classifications: B62D,H02P

Claim:
1. A control apparatus of a rotary machine, the control apparatus controlling drive of the rotary machine that has a plurality of winding groups, the control apparatus comprising: electric power converters in a plurality of systems, each of the electric power converters having a switching element in an upper arm and a switching element in a lower arm, and converting direct current power by a switching operation to supply to a corresponding winding group that corresponds to each of the electric power converters, wherein the switching element in the upper arm and the switching element in the lower arm are bridge connected; a failure detection portion detecting a failure of an electric power converter or a failure of a winding group; and a controller operating the switching elements in the electric power converters and controlling electricity supply to the winding groups in the rotary machine for each of the plurality of systems; wherein: when the failure detection portion detects the failure of the electric power converters or the failure of the winding group in any one of the systems, in the normal drive status, all of the electric power converters and all of the winding groups in the systems operate normally, and wherein: the control apparatus of the rotary machine operates the switching elements in the electric power converters by a PWM control to control the drive of the rotary machine; the controller includes a PWM frequency change portion changing a PWM frequency that is a frequency of a PWM carrier wave; and when the failure detection portion detects the failure of the electric power converters or the failure of the winding group in any one of the systems, when the failure detection portion detects the failure of the electric power converters or the failure of the winding group in any one of the systems, the PWM frequency of 20 Hz to 20 kHz is an audible frequency for a person.