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

Author

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

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield

Volume

45

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

2110

Lastpage

2117

Abstract

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.

Keywords

AC machines; finite element analysis; magnetic fields; magnetic flux; permanent magnet machines; d-q axis cross-coupling; d-q-axis flux-linkage model; flux-weakening; hybrid 2D finite-element-analytical method; magnetic field distribution; permanent-magnet brushless AC machines; skew coupling; stator slot-pitch skew; Cross-coupling; flux-weakening; inductances; magnetic saturation; optimal control; permanent-magnet machine; skew;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2013244

Filename

4816035