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Influence of Skew and Cross-Coupling on Flux-Weakening Performance of Permanent-Magnet Brushless AC Machines

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6 Author(s)
Qi, G. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield ; Chen, J.T. ; Zhu, Z.Q. ; Howe, D.
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A method is proposed for predicting the flux-weakening performance of permanent-magnet (PM) brushless ac machines accounting for skew and d-q axis cross-coupling. The method is based on a d-q-axis flux-linkage model, a hybrid 2-D finite-element (FE)-analytical method being used to predict the d- and q-axis inductances. However, it only requires 2-D FE analysis of the magnetic field distribution over a cross section of the machine. The developed method is used to predict the torque-speed characteristic of an interior PM brushless ac machine with one stator slot-pitch skew. This is compared with predictions from a direct FE analysis of the machine and validated by measurements.

Published in:

Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 5 )

Date of Publication:

May 2009

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