Patent ID: 8258735

Claim:
A power converting apparatus for motor driving comprising: a first power converting unit that is connected to an AC power supply and converts an AC voltage from the AC power supply into a DC voltage; a second power converting unit that is connected to the first power converting unit and converts the DC voltage into the AC voltage and outputs the AC voltage to an AC motor; a first control unit that controls the first power converting unit; and a second control unit that controls the second power converting unit, wherein the second control unit includes: a current-command generating unit that generates, based on at least a torque command, a current command for the AC motor; a voltage-amplitude-index calculating unit that calculates, based on the current command, a voltage amplitude index that should be applied to the AC motor; a current-command adjusting unit that generates, based on at least the voltage amplitude index and a frequency of the AC motor, a current command adjustment amount for adjusting the current command; and a pulsation-suppression-signal generating unit that generates, based on the DC voltage, a pulsation suppression signal, and the second control unit generates, based on a control signal including the current command adjusted by the current command adjustment amount and the pulsation suppression signal, a PWM signal to the second power converting unit and outputs the PWM signal.