PMSM Cogging Torque Compensation Based on Harmonic Analysis
A cogging torque compensation method is proposed to reduce the problem of speed fluctuations during motor operation caused by the inherent cogging torque ripple prompted by the physical structure of permanent magnet synchronous motors(PMSM).Firstly,a cogging torque compensation method was de-signed based on the mechanism of generating cogging torque;Using specialized equipment to obtain motor cogging torque data,and then combining with fast fourier transform(FFT)for harmonic analysis to calcu-late the fitted torque compensation online,which compensated for the torque command of the controller to reduce the impact of cogging torque ripple;Finally,practical testing was conducted,and the results showed that it can effectively reduce speed fluctuation of servo motors caused by the cogging torque ripple.
cogging torqueharmonic analysisspeed fluctuationspermanent magnet synchronous motor
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