Patent ID: 7650760
Filing Date: 2010-01-26
Classification: F25B,H02P,Y02B

Abstract:
1. A motor controller comprising: an inverter circuit for driving a brushless motor; a control unit for detecting rotational speed fluctuation of a brushless motor caused by load torque fluctuation and controlling a phase and an amplitude of a motor current of the brushless motor so as to restrict said rotational speed fluctuation via the inverter circuit; and a rectifier for rectifying an a.c. power output from an a.c. power source to output to the inverter circuit, wherein the control unit controls the amplitude of the motor current according to an absolute value of an output voltage of the a.c. power source such that a current flowing in the brushless motor becomes small during a period when the absolute value of the output voltage of the a.c. power source increases and becomes great during a period when the absolute value of the output voltage of the a.c. power source decreases.