MOTOR CONTROLLER AND AIR CONDITIONER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To prevent a current waveform from being distorted as a high-order component cannot be output since the number of PWM pulses included in one cycle of voltage/current becomes smaller when a rotor rotating speed is in a high-speed range than in a low-speed range while the number of PWM pulses is constant and it thereby becomes difficult to output a higher-order component of induced voltage high-order components.SOLUTION: A motor driving device includes a power converter which drives a permanent magnet motor, a controller which controls the output voltage of the power converter, and a voltage addition unit which adds a high-order component of an induced voltage to a voltage command value of the controller. The degree of the high-order component of the induced voltage added to the voltage command value of the controller is smaller as the rotating speed of the permanent magnet motor is higher.