Patent ID: 8324847
Filing Date: 2012-12-04
Classification: D06F,H02P,Y02B

Abstract:
1. A washer motor comprising: a stator on which a plurality of coils are wound and disposed in a circular shape; a rotor having a plurality of permanent magnets spaced apart from the coils by a predetermined distance; and a speed controller for generating at least one of a d-axis reference current Id* and a q-axis reference current Iq* by controlling currents Id and Iq on a d-q axis rotation coordinate system defined by a d-axis that is in parallel with a flux direction of the permanent magnets and a q-axis that is perpendicular to the flux direction by comparing a current speed of the rotor with a reference speed so that the current speed follows the reference speed, wherein, when the current speed is less than the reference speed in a spinning cycle, the speed controller generates the d-axis reference current Id*; a current controller for generating a d-axis reference voltage Vd* and a q-axis reference voltage Vq* based on the d-axis reference current Id* and q-axis reference current Iq* output from the speed controller; and an inverter for generating a PWM signal based on the reference voltages Vd* and Vq* output from the current controller and applying the generated PWM signal to the coils, wherein the d-axis reference current Id* generated in the washing cycle is zero (0) regardless of a difference between an actual speed and the reference speed.