公开(公告)号：US20210222340A1

公开(公告)日：2021-07-22

申请号：US17258058

申请日：2019-07-05

Applicant: LG ELECTRONICS INC.

Inventor： Wonseok PARK ,  Jieon KIM ,  Kiwook LEE

IPC: D06F34/10 ,  D06F33/42 ,  D06F37/30 ,  D06F39/08

Abstract: 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.

公开(公告)号：US20210269958A1

公开(公告)日：2021-09-02

申请号：US17258330

申请日：2019-07-05

Applicant: LG ELECTRONICS INC.

Inventor： Sungwan KIM ,  Jieon KIM ,  Jongseok JUNG

IPC: D06F33/42 ,  D06F39/08 ,  D06F37/30 ,  D06F23/04 ,  H02P27/08 ,  H02M7/5387

Abstract: The present disclosure relates to a laundry treatment machine. A drain laundry treatment machine according to an embodiment of the present disclosure: an inverter converting a direct current (DC) voltage from a converter into an alternating current (AC) voltage based on a switching operation and outputting the converted AC voltage to a drain motor; an output current detector to detect an output current flowing in the drain motor; and a controller to control the drain motor to rotate at a speed lower than a first speed when the output current flowing in the drain motor decreases in a state where a speed of the drain motor is the first speed. Accordingly, it is possible to reduce a pressure in a vortex chamber of the drain pump during dewatering.

公开(公告)号：US20210234494A1

公开(公告)日：2021-07-29

申请号：US17258149

申请日：2019-07-05

Applicant: LG ELECTRONICS INC.

Inventor： Jieon KIM ,  Jeongbin REW ,  Junho LEE

IPC: H02P29/024 ,  H02P27/08 ,  D06F39/08 ,  D06F34/10 ,  D06F33/42 ,  D06F33/47 ,  F04D13/06 ,  F04D15/00

Abstract: 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.