Patent ID: 8264190

Claim:
A control apparatus for a multi-phase rotary machine for controlling driving of the multi-phase rotary machine including a plurality of winding sets, each of which is formed of a plurality of windings corresponding to a plurality of phases, respectively, the control apparatus comprising: a plurality of inverter units forming a plurality of systems, each of the inverter units having a plurality of legs provided in correspondence to the plurality of phases, each of the legs including a high-side switching element and a low-side switching element; and a control unit for driving the multi-phase rotary machine by calculating a voltage command value, which is a command value of a voltage applied to each of the windings, and by controlling ON/OFF switching of the high-side switching element and the low-side switching element based on the voltage command value, wherein the control unit is configured to in a case where a short-circuiting failure occurred between a common bus at a high-side or a low-side of the leg and any one of the phases of the windings even when the high-side switching element and the low-side switching element are controlled to assume the OFF states, control all of the high-side switching elements and the low-side switching elements of a failure system into OFF states, respectively, continue to drive the multi-phase rotary machine by the legs of a no-failure system, and control the high-side switching element and the low-side switching element of each leg in the no-failure system such that an output is cancelled or an influence of the output exerted on the driving of the multi-phase rotary machine is reduced, the output being generated by the short-circuiting failure in the failure system and resistive to driving of the multi-phase rotary machine.