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

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...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-05, Vol.45 (5), p.2110-2117
Main Authors: Qi, G., Chen, J.T., Zhu, Z.Q., Howe, D., Zhou, L.B., Gu, C.L.
Format: Article
Language:English
Subjects:
AC machines
Accounting
Armature
Cross sections
Cross-coupling
Cross-disciplinary physics: materials science
rheology
Electromagnetic forces
Electromagnetic induction
Exact sciences and technology
Finite element method
Finite element methods
flux-weakening
inductances
Magnetic analysis
Magnetic field measurement
Magnetic fields
magnetic saturation
Magnetism
Materials science
Mathematical analysis
Mathematical models
optimal control
Other topics in materials science
permanent-magnet machine
Physics
Saturation magnetization
skew
Stators
Torque
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2013244