Method and system for restraining motor cogging torque

Abstract

The invention discloses a suppression method and system of motor cogging torque. The suppression method of motor cogging torque includes the steps: averagely dividing an armature notch of a permanentmagnet synchronous motor into m armature slot groups, wherein every two neighboring armature notch groups are corresponding groups for each other; utilizing a first offset angle calculating formula tocalculate the first offset angle of the armature notch, and utilizing the first offset angle to offset two armature notch groups in each corresponding group; determining whether the permanent magnetsynchronous motor after offset can satisfy the preset conditions and whether the harmonic number n of the cogging torque can achieve the maximum value which is integral multiple of 2n; and if not, utilizing the offset angle calculating formula to calculate the offset angle and continuously performing offset. The suppression method and system of motor cogging torque can preferably suppress the permanent magnet synchronous motor cogging torque, the fundamental wave of cogging torque and the specific number of harmonic wave by grouping the armature notch of the permanent magnet synchronous motorand utilizing the offset angle calculating formula to perform multiple times of grouped offset on the armature notch of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to the field of motors, in particular to a method and system for suppressing cogging torque of a motor. Background technique [0002] Permanent magnet synchronous motor has superior performance such as small size, high power density and torque density, simple structure, reliable operation, etc., and has no problems such as sparks and wear of commutator and brush, and has been increasingly used in various Production in the national sector. However, due to the existence of the armature slot of the permanent magnet synchronous motor, the stator teeth inevitably interact with the magnetic steel during the operation of the motor, causing changes in the magnetic field energy storage in the motor, thereby generating cogging torque , resulting in fluctuations in the output torque of the motor, affecting the control accuracy of the system. For a long time, how to weaken or suppress the cogging torque of permanent magnet synchronous motor...

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Problems solved by technology

[0004] In the prior art, the optimal solution using the response surface method will depend on the value range of the data in the response surface experiment, that is, the maximum and minimum values ​​of the notch offset angle in the experiment, which will lead to different value ranges, The difference in the optimal solution is not accurate enough, and it takes a long time to analyze and calculate using the response surface method; if the armature notch is divided into upper and lower parts, by offsetting the upper part of the notch by an appropriate angle, the lower half Part of the notch is offset by the same angle, so that the cogging torque components cancel each other out, but this method can only suppress a specific harmonic, and cannot cancel the fundamental wave and the first few harmonics at the same time, resulting in the suppression of The cogging torque of the permanent magnet synchronous motor, the fundamental wave of the cogging torque and the specific order harmonic effect are poor

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