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Permanent-Magnet Synchronous Motor Magnet Designs With Skewing for Torque Ripple and Cogging Torque Reduction

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4 Author(s)
Islam, R. ; Dept. of Electr. & Comput. Eng., Univ. of Akron, Akron, OH ; Husain, I. ; Fardoun, A. ; McLaughlin, K.

This paper examines the torque ripple and cogging torque variation in surface-mounted permanent-magnet synchronous motors (PMSMs) with skewed rotor. The effect of slot/pole combinations and magnet shapes on the magnitude and harmonic content of torque waveforms in a PMSM drive has been studied. Finite element analysis and experimental results show that the skewing with steps does not necessarily reduce the torque ripple but may cause it to increase for certain magnet designs and configurations. The electromagnetic torque waveforms, including cogging torque, have been analyzed for four different PMSM configurations having the same envelop dimensions and output requirements.

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Industry Applications, IEEE Transactions on  (Volume:45 ,  Issue: 1 )