The present disclosure relates to a laundry treatment machine. A laundry treatment machine comprises: an inverter to convert the DC voltage from the converter into alternating current (AC) voltage by a switching operation and to output the converted AC voltage to a motor; and a controller that controls such that, while a washing tub motor is rotating at a constant speed, a drain motor operates in a first period during which the speed of the drain motor increases, a second period during which the speed of the drain motor decreases after the first period, and a third period during which the speed of the drain motor decreases after the second period, wherein a rising slope in the second period is less than a falling slope in the third period. Accordingly, a speed ripple of the drain motor may be reduced.

The present disclosure relates to a drain pump driving apparatus and a laundry treatment machine including the same. A drain pump driving apparatus according to an embodiment of the present disclosure includes: a converter; an inverter to output converted AC voltage to a drain pump motor; an output current detector to detect an output current flowing in the motor; and a controller to control the inverter, wherein in case in which the speed of the motor increases and the output current flowing in the motor decreases during a predetermined period among an operation period of the drain motor, the controller controls the inverter to be turned off. Accordingly, it is possible to protect internal circuit elements in case the motor loses its synchronism.

The present disclosure relates to a drain pump driving apparatus and a laundry treatment machine including the same. A drain pump driving apparatus according to an embodiment of the present disclosure includes: a converter; an inverter to output converted AC voltage to a drain pump motor; an output current detector to detect an output current flowing in the motor; and a controller to control the inverter, wherein in case in which the speed of the motor increases and the output current flowing in the motor decreases during a predetermined period among an operation period of the drain motor, the controller controls the inverter to be turned off. Accordingly, it is possible to protect internal circuit elements in case the motor loses its synchronism.

A washing machine appliance and a method for operating a washing machine appliance are provided. The washing machine appliance includes a tub and a drum rotatably mounted within the tub. The drum defines a wash chamber for receipt of articles for washing. The washing machine appliance also includes a controller. The controller is configured for and/or the method includes selectively filtering a flow of wash liquid from the tub, automatically based on determining a load type of articles within the wash chamber and/or based on a received user input.

A washing machine appliance and a method for operating a washing machine appliance are provided. The washing machine appliance includes a tub and a drum rotatably mounted within the tub. The drum defines a wash chamber for receipt of articles for washing. The washing machine appliance also includes a controller. The controller is configured for and/or the method includes selectively filtering a flow of wash liquid from the tub, automatically based on determining a load type of articles within the wash chamber and/or based on a received user input.

A washing machine appliance and methods for operating the same are provided. The washing machine appliance includes features for executing a calibration cycle in which water flow rates through one or more valves may be calculated and water pressure conditions may be detected and identified. Further, in some instances, the flow rate setting of the washing machine appliance may be adapted or modified in accordance with the flow rates calculated during the calibration cycle.

The present disclosure relates to a laundry treatment machine and a method for controlling the same. A pump motor may operate according to the steps of starting up the pump motor when operating or stopping the pump motor. Upon restarting, the pump motor may be controlled to start up after being on standby until the rotor stops, and therefore the pump may run normally even in case in which the pump repeatedly stops and runs, and the drainage performance may be improved and wash water may be drained by the operation of the pump regardless of the lift level.

A laundry treating apparatus includes first and second treating apparatuses; a first display on which a control command that may be input to the first treating apparatus; a first apparatus input unit for inputting the control command to the first treating apparatus; a first display controller controlling the first display and the first apparatus input unit; a first apparatus first power circuit connecting the first display controller and the first apparatus input unit to a power source; a first apparatus second power circuit connecting the power source with the first load controller, switched by a first controller switch; and a first apparatus third power circuit connecting the power source with the first driving unit, switched by a first load portion switch. When the control command is input through the first apparatus input unit, the first display controller controls the first controller switch to close the first apparatus second power circuit.

A laundry treating apparatus includes first and second treating apparatuses; a first display on which a control command that may be input to the first treating apparatus; a first apparatus input unit for inputting the control command to the first treating apparatus; a first display controller controlling the first display and the first apparatus input unit; a first apparatus first power circuit connecting the first display controller and the first apparatus input unit to a power source; a first apparatus second power circuit connecting the power source with the first load controller, switched by a first controller switch; and a first apparatus third power circuit connecting the power source with the first driving unit, switched by a first load portion switch. When the control command is input through the first apparatus input unit, the first display controller controls the first controller switch to close the first apparatus second power circuit.

A method for detecting drain standpipe height in a washing machine appliance includes activating a drain pump such that the drain pump flows wash fluid from a tub to a drain standpipe, determining a height of the drain standpipe, and adjusting operation of the washing machine appliance in response to the determined height of the drain standpipe.