Accurate positioning method of rotor of brushless direct-current motor for direct drive type washing machine

Abstract

The invention provides an accurate positioning method of a rotor of a brushless direct-current motor for a direct drive type washing machine. According to an electromechanics principle, the phase separation of a winding of a motor is carried out according to a 60-degree phase belt method, and a stator is also stretched according to a circumferential direction. After an A-phase winding and a B-phase winding of the stator of the motor are electrified with direct current, a magnetic field is formed in the stator, and the electric angle direction of the magnetic field along the circumferential direction at interval of 180 degrees is alternated for one time. The primary winding is electrified with the direct current, static torque can be generated in the motor, and the rotor can be stopped at the position of a stable equilibrium point under the action of electromagnetic torque, so that the positioning of the rotor of the motor is realized. According to the accurate positioning method of the rotor of the brushless direct-current motor for the direct drive type washing machine, any position sensor is not needed, an open-loop control mode is adopted, and the accurate positioning control of the rotor of the motor in the circumferential direction is realized by the modes of electrifying the direct current in the primary winding of the brushless direct-current motor and also controlling the magnitude of the electrified current. The use requirement of a system of a direct drive type full-automatic washing machine can be met according to the accuracy of the method provided by the invention.

Description

technical field [0001] The invention relates to a precise positioning method for a brushless DC motor rotor used in a direct-drive washing machine, and belongs to the technical field of motor rotor positioning methods. Background technique [0002] The values ​​of washing speed and dehydration speed in fully automatic washing machines are several times different. For ordinary non-direct-drive fully automatic washing machines, there is an integrated deceleration clutch, which can complete the switching of the motor drive state in the two states of washing and dehydration. For the new direct-drive fully automatic washing machine, it is necessary to be equipped with a new clutch to complete this state switching task. This new type of clutch has no structures such as reduction gears, and does not need to complete the deceleration function, but only realizes the switching between washing and dehydration states through some specially designed meshing structures. Accomplishing th...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of precise positioning of the rotor of the brushless DC motor in the direct-drive washing machine, and further provide a method for precise positioning of the rotor of the brushless DC motor of the direct-drive washing machine

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