Patent ID: 8098035
Filing Date: 2012-01-17
Classification: H02P

Abstract:
1. A motor control unit for controlling a motor of a compressor in which a load torque varies in a single rotation in the course of fluid compression by the compressor, the motor control unit comprising: a power converter having a rectifier circuit which rectifies an AC voltage from an AC power supply, a capacitor circuit which receives an output of the rectifier circuit and outputs a rectified voltage having a waveform of a full-wave rectified AC power supply from both ends of a capacitor and an inverter circuit which receives the rectified voltage and outputs an AC voltage to the motor; and a motor controller controlling the motor by controlling the inverter circuit, wherein the motor controller performs torque control to vary an output torque of the motor in response to variation in load torque of the motor by superimposing a pulse component of the variation in load torque of the motor and a pulse component of the rectified voltage on an output torque of the motor.