US 11,739,457 B2
Laundry treatment machine and method for controlling the same
Junsung Kim, Seoul (KR); Kiwook Lee, Seoul (KR); and Jongseok Jung, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/258,063
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Jul. 5, 2019, PCT No. PCT/KR2019/008292
§ 371(c)(1), (2) Date Jan. 5, 2021,
PCT Pub. No. WO2020/009533, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 10-2018-0079053 (KR), filed on Jul. 6, 2018.
Prior Publication US 2021/0207305 A1, Jul. 8, 2021
Int. Cl. D06F 33/42 (2020.01); D06F 34/10 (2020.01); D06F 39/08 (2006.01); D06F 37/36 (2006.01)
CPC D06F 33/42 (2020.02) [D06F 34/10 (2020.02); D06F 39/08 (2013.01); D06F 39/083 (2013.01); D06F 37/36 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A laundry treatment machine comprising:
a washing tub;
a main motor configured to supply torque to the washing tub;
a pump;
a pump motor configured to operate the pump;
a pump driving apparatus configured to drive the pump motor; and
a main controller configured to control the pump driving apparatus to operate the pump based on changes in speed of the main motor during dewatering,
wherein, when the main motor speeds up to be within a range between a first speed and a second speed greater than the first speed, the main controller is configured to control the pump motor to decrease the speed for a set period of time, to increase the speed from a third speed to a fourth speed greater than the third speed after the decrease of the speed for the set period of time, and to maintain the third speed after the increase of the speed from the third speed to the fourth speed.