DC brushless motor system for drainage motor, and DC brushless motor control method and control apparatus for drainage motor

Abstract

A control method and control device of a direct current brushless motor for a drain pump, and direct current brushless motor system for the drain pump, the control method of the direct current brushless motor for the drain pump comprising: detecting the current flowing through the stator winding of the direct current brushless motor; comparing the current value of the current with a first critical current value; when the current value of the current is lower than the first critical current value, determining that the drain pump is in a half-water half-air operation state, and setting the target rotation speed of the direct current brushless motor as a first predetermined rotation speed, the first predetermined rotation speed being lower than the rated rotation speed of the direct current brushless motor. The half-water half-air state of the drain pump is identified according to the current flowing through the stator winding of the direct current brushless motor, and half-water half-air noise is reduced by reducing the target rotation speed of the direct current brushless motor in the half-water half-air state.

Description

technical field [0001] The present invention relates to the technical field of drainage pumps. More specifically, the present invention relates to a control method and control device for a DC brushless motor for a drainage pump of a household appliance, and a DC brushless motor system for a drainage pump of a household appliance. Background technique [0002] At present, single-phase AC permanent magnet synchronous motors are widely used in the field of drainage pumps for household appliances such as dishwashers and washing machines due to their high energy efficiency and excellent steady-state characteristics. However, single-phase AC permanent magnet synchronous motors have certain limitations in terms of starting and running performance. [0003] For example, in the application of the drain pump of the washing machine, in order to solve the problem that the motor is easily burned due to the heavy load when the drain pump starts, it is necessary to add a starting device. T...

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Problems solved by technology

The structure of this kind of motor is relatively complicated, the assembly process is cumbersome, and the increase of the starting chamber and the shock pad also greatly increases the cost. After multiple starts, there is a problem of failure of the shock pad.

[0004] Secondly, the single-phase AC permanent magnet synchronous motor itself cannot achieve directional rotation and speed regulation. It is necessary to add a non-return mechanism to the rotor structure to prevent the reverse rotation of the motor, and to realize the single-phase AC permanent magnet synchronous motor by adjusting the frequency of the supply voltage. It has high vibration, noise and high temperature rise during no-load operation, and in the later stage of the drainage process, a small amount of residual water is mixed with air, causing the drainage pump to be in a half-water and half-air state, and the motor cannot recognize this. state, the impeller is still rotating at high speed, resulting in half-water and half-air noise

[0005] With the introduction of the concept of green home appliances and the enhancement of environmental protection awareness, the existing drainage pumps can no longer meet the increasing requirements for the comfort of the living environment.

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