CPC D06F 33/42 (2020.02) [D06F 39/085 (2013.01); D06F 39/087 (2013.01); H02M 7/53871 (2013.01); H02P 23/14 (2013.01); H02P 27/08 (2013.01); D06F 2103/18 (2020.02); D06F 2105/08 (2020.02); D06F 2105/58 (2020.02)] | 17 Claims |
1. A laundry treatment machine, comprising:
a washing tub;
a washing tub motor configured to rotate the washing tub;
a water level sensor configured to sense a water level of the washing tub;
a drain pump configured to operate to drain the washing tub;
a motor configured to operate the drain pump;
a converter configured to output DC power;
an inverter configured to convert the DC power from the converter into AC power by a switching operation and output the converted AC power to the motor; and
a controller configured to, when a power supplied to the motor during a drainage operation does not reach a first power, increase a speed of the motor or a power consumed by the motor, when the power supplied to the motor exceeds the first power, decrease the speed of the motor, and when the power supplied to motor reaches the first power and remains within a first range corresponding to the first power and then falls from the first range, output a drainage completion message,
wherein while the power consumed by the motor remains within the first range, a water level frequency sensed by the water level sensor is constant and then increases, and during the increase in the water level frequency, when the power consumed by the motor falls from the first range, the controller is configured to output the drainage completion message.
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