Analysis and experiment of reducing cogging torque with pole width modulation permanent magnet motor
Abstract：The existence of cogging torque may cause the torque vibration and noise for motor.In view of the generation mechanism of cogging torque,several existing methods of reducing the cogging torque were compared and the feasibility of pole width modulation permanent magnet motor in reducing the cogging torque was proposed.The finite element electromagnetic field analysis software Ansoft was used to carry out the simulation for both conventional surface permanent magnet motor and pole width modulation permanent magnet motor,and the cogging torque of the permanent magnet motors with above-mentioned structures was calculated.In addition,a cogging torque test system composed of such components as angle sensor,permanent magnet motor and torque wrench was designed and established to perform the experiments for the cogging torque of the permanent magnet motors with two different structures.The experimental results are consistent with the simulation ones with Ansoft.And it is proved that the method of reducing the cogging torque with the pole width modulation permanent magnet motor is correct and the pole width modulation method is also an efficient method for reducing the cogging torque.
Keywords：permanent magnet motorcogging torquepole width modulation principlefinite element analysisprototype testtorque rippleair-gap magnetic fieldsinusoidal distortion rate
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)