A system for driving a motor by a pulse width modulation inverter.

摘要

A system for driving an alternate current motor including a pulse width modulation inverter having the two-range driving characteristics, wherein the motor is driven by the pulse width modulation output having a simulated sine wave form (PWM (1), PWM (2)) at the speed lower than the base speed of the motor and by the pulse width modulation output having a rectangular wave form (PWM (3), PWM (4)) at the speed higher than the base speed of the motor.