US 11,718,944 B2
Laundry treatment machine
Jungmoon Je, Seoul (KR); and Kiwook Lee, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/48,682
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Apr. 19, 2019, PCT No. PCT/KR2019/004740
§ 371(c)(1), (2) Date Oct. 19, 2020,
PCT Pub. No. WO2019/203606, PCT Pub. Date Oct. 24, 2019.
Claims priority of application No. 10-2018-0045731 (KR), filed on Apr. 19, 2018.
Prior Publication US 2021/0156065 A1, May 27, 2021
Int. Cl. D06F 33/32 (2020.01); D06F 33/48 (2020.01); D06F 33/42 (2020.01); D06F 34/14 (2020.01); H02P 6/17 (2016.01); H02P 6/28 (2016.01); D06F 103/48 (2020.01); D06F 103/26 (2020.01); D06F 103/42 (2020.01); D06F 34/08 (2020.01); D06F 105/08 (2020.01); D06F 23/02 (2006.01); F04D 25/06 (2006.01); F04D 27/00 (2006.01); D06F 103/46 (2020.01); D06F 103/68 (2020.01); D06F 105/48 (2020.01); D06F 37/30 (2020.01); D06F 39/08 (2006.01)
CPC D06F 33/32 (2020.02) [D06F 33/42 (2020.02); D06F 33/48 (2020.02); D06F 34/14 (2020.02); D06F 23/02 (2013.01); D06F 34/08 (2020.02); D06F 37/304 (2013.01); D06F 39/082 (2013.01); D06F 2103/26 (2020.02); D06F 2103/42 (2020.02); D06F 2103/46 (2020.02); D06F 2103/48 (2020.02); D06F 2103/68 (2020.02); D06F 2105/08 (2020.02); D06F 2105/48 (2020.02); F04D 25/06 (2013.01); F04D 27/004 (2013.01); H02P 6/17 (2016.02); H02P 6/28 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A laundry treatment machine comprising:
a washing tub;
a driver to drive the washing tub;
a drain pump;
a motor to drive the drain pump;
a converter to output a direct current (DC) power;
an inverter to convert the DC power at a DC terminal into an alternating current (AC) power based on a switching operation and to output the converted AC power to the motor;
an output current detector to detect an output current flowing in the motor; and
a controller configured to, during dewatering, drive the motor at a first speed when a lift is at a first difference level and to drive the motor at a second speed greater than the first speed when the lift is at a second difference level greater than the first difference level,
wherein the lift is a difference between a height of a water flowing into a water introduction part of the drain pump and a height of a water drain pipe connected to the drain pump,
wherein the controller is configured to, during drainage before the dewatering, drive the motor with a first power when the lift is at the first difference level and to drive the motor with the first power when the lift is at the second difference level greater than the first difference level.