Patent ID: 8847541

Claim:
A control method of a motor inverter which having switching elements for each phase of the 3-phase motor and driving the motor by turning on and off the switching elements, comprising: dividing one rotation in electrical angle of a rotor of the motor into a plurality of areas, and defining a phase in a plurality of phases provided with switching elements for each area as a stationary phase in which a switching operation is not performed, based on current command value of each phase acquired from d-axis current command value and q-axis current command value of the motor; and performing the switching operation of the switching elements of phases other than the stationary phase determined for each area, thereby realizing the 2-phase modulation control, wherein the stationary phase is determined after determining candidate phases as possible stationary phase depending on a voltage command value of each phase, and selecting a candidate phase from among determined candidate phases depending on the current command value of each phase.