Control method, control system and control device for brushless direct current permanent magnet motor of intelligent washing machine

Abstract

The invention provides a control method, a control system and a control device for a brushless direct current permanent magnet motor of an intelligent washing machine. The control device for the brushless direct current permanent magnet motor of the intelligent washing machine comprises an intelligent washing machine system control unit, a motor drive controller, a motor driver and a detection unit. The control method, the control system and the control device provided by the invention have the beneficial effects that high-accuracy position identification and control can be performed on the brushless direct current permanent magnet motor by the motor drive controller, and therefore a more intelligent new washing mode of the washing machine can be realized, and under the requirement of equivalent control precision, number of pole pairs of the brushless direct current permanent magnet motor can be reduced, and process difficulty of the main drive brushless direct current permanent magnet motor is obviously reduced so as to further reduce manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a control method, system and device for a brushless DC permanent magnet motor of an intelligent washing machine. Background technique [0002] With the continuous improvement of people's requirements for washing machine functions and the continuous development of washing machine control technology itself, some new washing control modes have been proposed in the current drum type washing machine control technology. What is more characteristic is the "6 intelligent hand washing modes", which simulate human hands to achieve six hand washing modes: strong clean rubbing, penetrating squeeze, soaking squeeze, fluffy solution, soothing shake, and clean knock. Compared with the general automatic washing mode, the "6 intelligent hand washing modes" are more intelligent, and can wash clothes cleaner without harming the clothes themselves. [0003] To realize "six intelligent ...

AI Technical Summary

Problems solved by technology

At present, most smart washing machines use brushless DC permanent magnet motor frequency conversion direct drive. There are many ways to detect its position, speed and rotation angle for control. The common way is to use the motor stator at the end of the motor at 360° Electrical angle range, three Hall sensors are evenly arranged to obtain the position information of the rotor. The cost of this method is low, but according to the coding rules, it can only detect the position information of 60° electrical angle, and cannot provide continuous and more accurate Based on this, the second method is to increase the number of pole pairs of the smart washing machine motor, and improve the detection accuracy of the mechanical position information of the motor rotor by using the electrical angle as the multiplication relationship between the mechanical angle of the motor and the number of pole pairs.

This method leads to an increase in the manufacturing cost of the washing machine motor. At the same time, compared with the higher detection requirements of position accuracy for control, in terms of technical implementation, it cannot be satisfied by simply increasing the number of motor pole pairs.

The third method is to use the detection unit module to detect, calculate and compare the three-phase current and back electromotive force of the motor to obtain the continuous position information of the motor instantaneously, but this method cannot obtain the position information when the motor stops , relying on this detection method, it is difficult to achieve accurate detection and control of the motor's operating position

Images