Laundry treatment machine
AssigneeLG Electronics Inc.
InventorsJungmoon Je, Kiwook Lee
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a laundry treatment machine. According to an embodiment of the present disclosure, a laundry treatment machine includes a controller controlling a motor, during dewatering, to be driven at a first speed when a lift is at a first level and to drive the motor at a second speed greater than the first speed when the lift is at a second level greater than the first level, wherein the lift is a difference between a water level of a water introduction part through which water flows into a drain pump and a water level of a water discharge part through which the water is discharged out of the drain pump. Accordingly, noise or vibration can be reduced even if the lift is changed during the dewatering.
Claims20
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.
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 when the lift is at the first difference level, the controller is configured to drive the motor with a power within a first allowable range based on the first power, without decreasing over time, from a first time point after drainage is started until completion of the drainage, and
- when the lift is at the second difference level, the controller is configured to drive the motor with a power within the first allowable range based on the first power, without decreasing over time, from the first time point until completion of the drainage.
Dependencies are inferred from the claim text.