Patent ID: 7543464
Filing Date: 2009-06-09
Classification: D06F

Abstract:
1. An apparatus for switching a power transmission mode of a washing machine comprising: a coupling for selectively transmitting a power of a BLDC motor to a washing shaft and a spinning shaft via a coupling stopper; a clutch including a clutch motor for moving up/down the coupling by driving a cam, the cam fitted to be rotatable with the clutch motor and having a cam recess surface, and a switch contacting the cam recess surface for providing a switching signal in response to the rotation of the clutch motor; a motor sensing part for sensing the rotation of the BLDC motor; a power supplying part for supplying a voltage to the clutch motor; a pulse counting part for counting the number of pulses of power supplied to the clutch motor from the power supplying part when the switching signal of the switch is provided; and a micom for repeating rotation of the cam until the counted number of pulses is equal to, or greater than a preset number of pulses on driving the clutch motor and for checking whether the power of the BLDC motor is reset by data provided from the motor sensing part.