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Analytical Prediction of Cogging Torque in Surface-Mounted Permanent-Magnet Motors

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3 Author(s)
D. Lin ; Ansoft, LLC, Pittsburgh, PA, USA ; S. L. Ho ; W. N. Fu

We present a new approach to computing cogging torque based on only one analytical field solution in surface-mounted permanent-magnet (PM) motors. We use conformal transformation to compute the magnetic field created by the permanent magnets in the air gap with a single slot. Then, we derive the cogging torque due to the single-slot effect at different rotor positions directly from the 2-D analytical field solution. The total cogging torque is synthesized from the contribution of each slot. We have applied our approach to predicting the cogging torque of two surface-mounted PM motors, one with 4 poles, 24 slots and the other with 42 poles, 36 slots. The predicted cogging torques for both applications agree well with those obtained from 2-D finite-element analysis.

Published in:

IEEE Transactions on Magnetics  (Volume:45 ,  Issue: 9 )