Control apparatus for rotating electric machine

A control apparatus for a rotating electric machine that is applied to a control system, the control system including a power conversion circuit that performs switching operations to convert direct-current power from a direct-current power supply to alternating-current power and to output the alternating-current power, a rotating electric machine to which the alternating-current power outputted from the power conversion circuit is supplied, and a capacitor that is connected in parallel to the direct-current power supply and provided on an input side of the power conversion circuit, the control apparatus comprising:

• a first selecting unit that selects two types of active voltage vectors that sandwich a command voltage vector applied to the rotating electric machine from the power conversion circuit and have a phase difference of 60 degrees therebetween;
• a second selecting unit that selects, of two types of active voltage vectors that sandwich the command voltage vector and have a phase difference of 120 degrees therebetween, one of two types of active voltage vectors that differs from the two types of active voltage vectors selected by the first selecting unit, based on a driving state of the rotating electric machine;
• and
• an operating unit that controls the power conversion apparatus to perform switching operations to control the rotating electric machine, based on the two types of active voltage vectors selected by the first selecting unit and the one of two types of active voltage vectors selected by the second selecting unit, wherein:
• the second selecting unit selects, of two types of active voltage vectors that sandwich an active voltage vector corresponding to a phase of which an absolute value of a phase current is the largest and have a phase difference of 120 degrees therebetween, one of two types of active voltage vectors that differs from the two types of active voltage vectors selected by the first selecting unit, based on each phase current flowing to the rotating electric machine.