Method using non-uniform stator slots to inhibit cogging torque of permanent magnet synchronous motor

Abstract

The invention discloses a method using non-uniform stator slots to inhibit the cogging torque of a permanent magnet synchronous motor. Under the condition that the size of stator teeth does not change, center positions of stator slots rotate and deviate in the circumferential direction of a stator. The method is simple in technique and easy for implementation and does not need to increase any extra machining step. The coupling influence of the offset angles of the stator slots and other parameters of the motor is small, and thus the offset angles can be designed independently. While reducing the cogging torque of the motor, the method can also improve the counter electromotive force waveform of the motor, reduce electromagnetic torque fluctuation, avoid asymmetric phenomena of three-phase windings due to non-uniform slot distribution, and effectively improve the overall performance of the motor.

Description

technical field [0001] The invention relates to a method for suppressing the cogging torque of a permanent magnet synchronous motor by using non-uniform stator slots, and belongs to the field of permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motor has high efficiency, power factor and torque density, so it is widely used in various fields of industrial production and daily life. However, for permanent magnet synchronous motors, especially low-speed direct-drive permanent magnet synchronous motors, the existence of cogging torque will cause vibration and noise of the motor, which seriously affects the system control accuracy and torque stability, so it has become a key problem in motor design and control. one. [0003] Through the research on the generation mechanism of cogging torque, people have proposed a variety of methods to weaken the cogging torque of permanent magnet motors, such as optimizing the pole-slot fit, changi...

AI Technical Summary

Problems solved by technology

The pole-slot matching method is limited by the number of poles and slots of the motor; the optimization of the rotor magnetic poles is often difficult to manufacture and the cost is high; and the use of auxiliary slots often weakens the mechanical strength of the stator teeth and easily leads to saturation of the iron core

At present, the chute is a more commonly used method, but it is not suitable for motors with shorter axial lengths

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