A washing machine includes a water tub arranged in a case and a damper installed between the case and the water tub for damping vibrations of the water tub. The damper includes a plunger having one end supported on the case; a rod having one end supported on the water tub and the other end movably inserted to the plunger; a housing arranged to wrap around some of the plunger and the rod and including a friction member arranged between the housing and the plunger to contact an outer circumferential surface of the plunger; and a switching device configured to be in a first state in which the rod is coupled to the housing and able to move within the plunger along with the housing and a second state in which the rod is decoupled from the housing and able to move solely within the plunger.

A washing machine includes a water tub arranged in a case and a damper installed between the case and the water tub for damping vibrations of the water tub. The damper includes a plunger having one end supported on the case; a rod having one end supported on the water tub and the other end movably inserted to the plunger; a housing arranged to wrap around some of the plunger and the rod and including a friction member arranged between the housing and the plunger to contact an outer circumferential surface of the plunger; and a switching device configured to be in a first state in which the rod is coupled to the housing and able to move within the plunger along with the housing and a second state in which the rod is decoupled from the housing and able to move solely within the plunger.

Disclosed herein is a drain pump driving apparatus and a laundry treatment machine including the same. The drain pump driving apparatus and the laundry treatment machine including the same according to an embodiment of the present invention include a motor to operate the drain pump, an inverter to convert a direct current (DC) power to an alternating current (AC) power by a switching operation and output the converted AC power to the motor, an output current detector to detect an output current flowing to the motor, and a controller to control the inverter, wherein the controller may calculate a speed ripple of the motor based on the output current and performs a control operation based on the calculated speed ripple of the motor to change a speed of the motor.

Disclosed herein is a drain pump driving apparatus and a laundry treatment machine including the same. The drain pump driving apparatus and the laundry treatment machine including the same according to an embodiment of the present invention include a motor to operate the drain pump, an inverter to convert a direct current (DC) power to an alternating current (AC) power by a switching operation and output the converted AC power to the motor, an output current detector to detect an output current flowing to the motor, and a controller to control the inverter, wherein the controller may calculate a speed ripple of the motor based on the output current and performs a control operation based on the calculated speed ripple of the motor to change a speed of the motor.

A washing machine having a cabinet, a drum for receiving laundry from its open end where the drum is rotatable around its longitudinal axis within the cabinet, a balancer having a mass channel, and a balancing weight where the mass channel extends in a direction from the lateral surface of the drum to the inside of the drum and receives the balancing weight and the balancing weight is movable within the mass channel along the direction of the extension of the mass channel is disclosed. The invention also relates to a method of increasing the balance of a drum rotating along its longitudinal axis within a washing machine, the method determining the unbalanced load of the laundry received by the drum, and moving a balancing weight in a direction between the lateral surface and the longitudinal axis of the drum.

A washing machine having a cabinet, a drum for receiving laundry from its open end where the drum is rotatable around its longitudinal axis within the cabinet, a balancer having a mass channel, and a balancing weight where the mass channel extends in a direction from the lateral surface of the drum to the inside of the drum and receives the balancing weight and the balancing weight is movable within the mass channel along the direction of the extension of the mass channel is disclosed. The invention also relates to a method of increasing the balance of a drum rotating along its longitudinal axis within a washing machine, the method determining the unbalanced load of the laundry received by the drum, and moving a balancing weight in a direction between the lateral surface and the longitudinal axis of the drum.

A laundry apparatus includes an exterior housing, a tub, one or more tub mounts rigidly mounting the tub to the exterior housing, a drum positioned within the tub and rotatable relative to the tub, a control unit, a motor, one or more load imbalance sensors, and a dynamic balancing assembly. The motor is communicatively coupled to the control unit and operatively coupled to the drum. The one or more load imbalance sensors are communicatively coupled to the control unit and configured to output a load imbalance signal to the control unit, the load imbalance signal being indicative of a load imbalance within the drum. The dynamic balancing assembly is includes one or more counterweight devices configured to be orbited about the primary rotation axis to counteract a detected load imbalance in the drum. The tub is unsupported by any displaceable suspension members extending between the tub and the exterior housing.

A washing machine includes a washing tub configured to accommodate laundry therein, a motor configured to rotate the washing tub, and a controller. The controller is configured to: determine a laundry amount and a laundry-tangled degree by using a plurality of types of data that are measured while rotating the washing tub at a specific rotational speed; set an allowable unbalance (UB) value corresponding to the laundry amount and the laundry-tangled degree; determine a UB value based on rotating the washing tub during a dewatering stroke; and control the motor to stop rotating the washing tub based on the UB value exceeding the allowable UB value.

A washing machine includes a washing tub configured to accommodate laundry therein, a motor configured to rotate the washing tub, and a controller. The controller is configured to: determine a laundry amount and a laundry-tangled degree by using a plurality of types of data that are measured while rotating the washing tub at a specific rotational speed; set an allowable unbalance (UB) value corresponding to the laundry amount and the laundry-tangled degree; determine a UB value based on rotating the washing tub during a dewatering stroke; and control the motor to stop rotating the washing tub based on the UB value exceeding the allowable UB value.

A laundry dryer includes a cabinet, a user interface that is operably coupled to the cabinet, a motor that is disposed within the cabinet and communicatively coupled with the user interface, and a controller that is communicatively coupled with the user interface and the motor, respectively. The controller includes a memory storage that includes a plurality of night routines. The controller is configured with a selectable time point and is further configured to select at least one of the plurality of night routines at the selectable time point.