MOTOR CONTROLLER OF COMPRESSOR

PROBLEM TO BE SOLVED: To lessen the vibration caused by the difference between load torque and motor output torque by controlling the load torque and motor output torque rippling hourly during one rotation to be roughly equal. SOLUTION: For the information of load added to a compressor 13, the magnitude of the load changing with the passage of operation time is detected with a detector 17-1 which detects the temperature of a condenser 14 and a detector 17-2 which detects the temperature of an evaporator 16. Then, a position detector 18 detects the rotational position during one revolution of the rotor of the motor of a compressor 13, and the signals of these detected load information and the rotational position information are outputted to a controller 20 through a signal converter 19. The controller 20 judges the operation time of the compressor and the load torque at some time and outputs the command signal to control the motor to a power driver 21 so as to drive the compressor with output torque geared to the magnitude of this load torque.