Control device and drive method of washing machine motor, and washing machine

Abstract

The invention relates to a control device of a washing machine motor. The control device comprises a first controlled switch and a second controlled switch which are controlled by a central controller, a first winding and the first controlled switch are connected in series and are connected between an alternating current electric phase and a zero line to form a first power-supply return circuit; a second winding and the second controlled switch are connected in series and are connected between the alternating current electric phase and the zero line to form a second power-supply return circuit; the control device further comprises a third controlled switch which is controlled by a central processor and enables the second power-supply return circuit to be cut off from an alternating current electrical phase line in the designated working flow. The invention further relates to a washing machine motor control method and a washing machine thereof; by adopting the control device and drive method of washing machine motor, and washing machine the invention has the beneficial effects that controlled silicon which controls the reverse winding can be protected and has the small possibility of damage.

Description

technical field [0001] The invention relates to the field of home appliance control, more specifically, to a washing machine motor control device, a driving method and the washing machine. Background technique [0002] A washing machine, especially a pulsator washing machine, is a commonly used household appliance. Usually, the washing motor of the pulsator washing machine uses an induction AC motor. This induction AC motor has two forward and reverse windings. By connecting the two windings in a time-sharing manner, the washing machine motor runs forward and reverse alternately to achieve the washing effect. Washing machine controls typically use SCRs to control these two windings. However, due to the characteristics of the AC motor itself, the motor will generate a back electromotive force of several hundred volts when it is running. This back electromotive force is directly added to the thyristor, which can easily cause damage to the thyristor. In the pulsator washing m...

AI Technical Summary

Problems solved by technology

The usual design is to use an RC absorption circuit to protect the thyristor, but the RC circuit can only absorb some high-frequency signals to a certain extent, and cannot absorb the back electromotive force generated by the motor during normal use.

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