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Influence of skew and cross-coupling on flux-weakening performance of permanent-magnet brushless AC machines

By G. Qi, J.T. Chen, Z.Q. Zhu, D. Howe, L.B. Zhou and C.L. Gu


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

Publisher: IEEE
Year: 2009
OAI identifier:

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