Patent ID: 8664902

Claim:
A driving device for a polyphase AC motor having polyphase stator magnetic poles formed independently for each of a plurality of phases, said driving device comprising: an inverter for supplying polyphase alternating currents of variable voltages/frequencies due to pulse width modulation to said polyphase AC motor, and a control unit for controlling said inverter, wherein: a magnetic resistance of at least one of said phases of said stator magnetic poles is different from magnetic resistances of others of said phases of said stator magnetic poles, said control unit includes a correction unit for calculating a correction to reduce magnetic flux pulsations of a secondary electric angle by setting an amplitude and/or a phase of an alternating current to be supplied to at least one of said phases of said stator magnetic poles that is different from amplitudes and/or phases of alternating currents to be supplied to others of said phases of said stator magnetic poles, and said correction is calculated in said correction unit before supplying said polyphase alternating currents to said polyphase AC motor.