INVERTER

摘要

PROBLEM TO BE SOLVED: To provide an inverter which can reduce operation noise and vibration. SOLUTION: This inverter comprises an DC/AC converting means which includes a switching element to convert an DC voltage to a pseudo-AC voltage with ON and OFF conditions of the switching element in order to output the pseudo-AC voltage to a 3-phase brushless DC motor, a voltage detecting means for detecting an induced voltage in the period wherein an armature current of the 3-phase brushless DC motor becomes zero by reducing the pseudo-AC voltage, and a PWM control means for pulse width modulation(PWM) control of the pseudo-AC voltage outputted from the DC/AC converting means. This inverter further comprises a current waveform compensating means for shaping an armature current waveform supplied to the 3-phase brushless DC motor depending on an induced voltage detecting information of the voltage detecting means based on the predetermined conditions and for outputting the waveform shaping information to the PWM control means.