WASHING MACHINE WITH BALL BALANCER AND METHOD OF CONTROLLING VIBRATION REDUCTION THEREOF

摘要

A washing machine having a ball balancer to reduce vibration generated during dehydrating process and a vibration controlling method thereof are disclosed. In a washing machine having a ball balancer, a dehydrating process starts while residual water having a preset water level remains in the tub without draining water completely when entering the dehydrating process, and the quantity of residual water is set differently according to eccentricity so that excessive vibrations of a tub may be reduced using the weight of the residual water while passing through a resonant point. Speed of a motor is maintained at a preset speed lower than the resonant point for a preset time to release balls in the ball balancer so that excessive vibrations of the tub generated by concentrated balls and unbalanced laundry may be surely reduced. After passing through the resonant point, the residual water is drained to reduce drain noise and to prevent delay of dehydrating time.

主权项

1. A method of controlling vibration of a washing machine including a tub accommodating water, a rotating tub rotatably installed in the tub, a washing motor rotating the rotating tub, and a drain motor draining the water in the tub, the method comprising:
draining the water in the tub to a preset quantity of water by driving the drain motor when a washing process or a rinsing process is completed; stopping the draining and rotating the rotating tub by driving the washing motor, when the quantity of the water in the tub reaches a preset quantity; detecting a degree of eccentricity caused by the vibration of the tub using a vibration sensor during the rotation of the rotating tub; setting a quantity of residual water according to the detected eccentricity degree; draining the water in the tub to the preset quantity of the residual water by driving the drain motor; and stopping the draining and entering a dehydrating process, when the quantity of the water in the tub reaches the preset quantity of the residual water.