Permanent magnet motor capable of automatically adjusting magnetism

Abstract

Once a permanent magnet motor at present is manufactured, an electromagnetic structure of the permanent magnet motor is fixed and is not changed in operation, so when the motor is overloaded, the current is high, the cost of a controller is increased, the voltage is on the high side at a high speed, and the speed regulation range is influenced. The invention provides a speed regulation permanent magnet motor capable of automatically adjusting the magnetic flux of a stator winding of a linkage motor. The speed regulation permanent magnet motor is characterized by comprising a magnetism adjusting mechanism integrated in the motor, wherein the magnetism adjusting mechanism can change the magnetic flux of the stator winding of the linkage motor according to changes of the rotating speed of the motor, adjust torque coefficients and back electromotive force coefficients of the motor, reduce the current of the motor at a low speed, and reduce the cost of a motor controller; besides, the magnetism adjusting mechanism can reduce the motor voltage when the motor during high-speed operation, reduce weak magnetic current or leave out weak magnet control, and expand the speed regulation range of the motor.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a speed-regulating permanent magnet motor capable of automatically adjusting the magnitude of the permanent magnet flux in a main magnetic circuit. Background technique [0002] The variable speed permanent magnet motor controlled by the frequency converter is widely used in servo, elevator, wind power, new energy vehicle, industrial drive and other fields. [0003] At present, once the permanent magnet motor is manufactured, its electromagnetic structure is fixed and will not change during operation. However, this single electromagnetic structure often has the defect of large current in the acceleration section of the motor in the speed regulation occasion, because the motor needs to To achieve acceleration, the acceleration torque is often much larger than the rated torque, so the motor current during acceleration is often much larger than the rated current, so the current that the m...

AI Technical Summary

Problems solved by technology

However, this technology also has certain defects, that is, the current is larger when using field-weakening control than when not using field-weakening control, because when using field-weakening control, in addition to the current used to generate torque in the total motor current, Additional current is also required for field weakening, which leads to an increase in total current, resulting in increased motor heating and controller heating

Images