Patent ID: 6737828
Filing Date: 2004-05-18
Classification: D06F,H02P,Y02B

Abstract:
A washing machine motor drive device comprising:an alternating current source; a rectifier circuit connected to said alternating current source; an inverter circuit operable to convert DC power of said rectifier circuit into AC power; a DC brushless motor driven by said inverter circuit, said DC brushless motor being operable to drive an agitator or a washing/spinning tub; a rotor position detector operable to detect a rotor position of said DC brushless motor; a current detector operable to detect a current of said DC brushless motor; and a control device operable to control said inverter circuit, wherein said control device resolves the current of said DC brushless motor into a current component that corresponds to magnetic flux and a current component that corresponds to torque, controls the current component corresponding to magnetic flux and the current component corresponding to torque independently, and controls the current component corresponding to magnetic flux so that the current component corresponding to magnetic flux is increased in a negative direction in accordance with a revolution speed of said DC brushless motor.