A drain pump includes an impeller, a rotor configured to rotate the impeller, a stator, a first housing that defines a rotor accommodating portion, a second housing that is coupled to the first housing and that defines together with the first housing a motor accommodating space that accommodates the stator, a connector that extends from the stator and that has a contact surface configured to connect to a power source and exposed to an outside of the motor accommodating space through at least one of the first housing or the second housing, and a connector cover portion that is located at at least one of the first housing or the second housing to cover the connector and that has at least one side surface opened to expose the contact surface of the connector to the outside of the motor accommodating space.

The present disclosure relates to a laundry treatment apparatus and a control method thereof. The laundry treatment apparatus includes a tub providing a space in which washing water is stored, a drum, a drain pump, a control unit controlling water supply and drain and determining a drain state, and a pump control unit changing and controlling an operation speed of the drain pump depending on the drain state and is configured to drain the washing water by repeating a process of decreasing and then increasing a speed of the drain pump depending on a speed set by the pump control unit, such that the wash water does not remain and may be effectively drained, and noise generated due to a flow of residual water and an operation of the drain pump may be eliminated.

The present disclosure relates to a laundry treatment machine. The laundry treatment machine according to an embodiment of the present disclosure includes a controller configured to increase or decrease stepwise a speed of a motor during dewatering. Accordingly, it is possible to reduce a speed ripple during dewatering.

A method of controlling a washing machine. The washing machine includes a tub with an entry hole configured to receive laundry, a drum rotatably disposed in the tub, a ring-shaped gasket disposed along a circumference of the entry hole of the tub, a pump configured to circulate water that is discharged from the tub, and at least one circulation nozzle provided in the gasket and configured to spray the water that is circulated by the pump into the drum. The method includes: supplying water into the tub; rotating the drum; accelerating a pump speed of the pump while the drum rotates; and based on the pump speed of the pump reaching a threshold speed during the acceleration of the pump, opening a spray valve of the washing machine such that water supplied from an external water source is sprayed into the drum through a direct water nozzle.

A laundry washing machine having a washing tub external to a washing drum configured to receive the laundry to be washed, a recirculation system having a first duct to circulate liquid into a first region of the washing tub and a second duct to circulate liquid into a second region of the washing tub. The recirculation system comprises a recirculation pump operable in a first direction of rotation and in a second direction of rotation opposite to the first direction. The recirculation pump is operated in the first direction to circulate liquid in the first duct and is operated in the second direction to circulate liquid in the second duct.

A motor includes a first housing having a groove, a rotor inserted into the groove and rotatably provided outside the first housing, a second housing coupled to the first housing to form a space together with an outer circumferential surface of the groove, a stator provided in the space, a rotation shaft coupled to the rotor and extended in one direction, and a sealer coupled to the first housing to surround the rotation shaft. The sealer includes a base rotatably coupled to the rotation shaft, a gasket brought into contact with an outer circumferential surface of the rotation shaft, and a cover coupled to the base to fix the gasket to the base. The base includes a first annular protruding portion spaced apart from the rotation shaft to support the gasket, and a second annular protruding portion spaced apart from the first annular protruding portion to support the gasket.

A laundry washing machine having a washing drum, a washing tub external to the washing drum and a recirculation system having a first duct terminating at a first region of the washing tub and a second duct terminating at a second region of the washing tub. The recirculation system comprises a recirculation pump for conveying liquid to a bifurcation for the first duct and the second duct. The recirculation pump has a first functioning condition wherein liquid circulates only in the first duct and a second functioning condition wherein liquid circulates both in the first and second ducts.

A drain pump has a sealed cavity formed by a motor base and a pump casing. A partition plate divides the cavity into a motor cavity, and a pump impeller cavity. A side of the partition plate facing the motor cavity is provided with a bearing base. Another side facing the pump impeller cavity comprises a plane; a bearing mounted in the bearing base penetrates through the two cavities. The bearing in the pump impeller cavity slightly protrudes from the plane of the partition plate, and is tightly attached to a pump impeller in the pump impeller cavity, to form a second contact. The pump impeller and a pump impeller shaft are subjected to integral injection molding. The pump impeller shaft is tightly fixed in the bearing, penetrates through the partition plate, enters the motor cavity, and is connected with the pump shaft in the motor cavity.

Washing machine appliances and methods of operating a pump thereof are provided herein. The washing machine appliance may include a tub, a basket, a nozzle, a measurement device mounted to the tub, a motor, a drain pump, and a controller. The basket may be rotatably mounted within the tub. The nozzle may be in fluid communication with the tub to selectively flow liquid thereto. The motor may be in mechanical communication with the basket to selectively rotate the basket within the tub. The drain pump may be in fluid communication with the tub to selectively motivate wash fluid therefrom. The controller may be operative communication with the measurement device, the motor, and the drain pump. The controller may be configured to initiate a washing operation.

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.