Reduction on Cogging Torque in Flux-Switching Permanent Magnet Machine by Teeth Notching Schemes

The cogging torque in flux-switching permanent magnet machines (FSPMs) is high due to its unique structure and high air-gap flux density. The cogging torque principle in FSPM is different from that in traditional PM machines, which can not be correctly predicted by analytical consideration. The aim...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2012-11, Vol.48 (11), p.4228-4231
Main Authors: Wang, Daohan, Wang, Xiuhe, Jung, Sang-Yong
Format: Article
Language:English
Subjects:
Air gaps
Cogging torque
Cross-disciplinary physics: materials science
rheology
Design engineering
Educational institutions
Electrical engineering
Exact sciences and technology
finite-element analysis (FEA)
flux switching permanent magnet machine (FSPM)
Forging
Magnetism
Materials science
Other topics in materials science
Permanent magnet machines
Physics
Rotors
Stators
Studies
teeth notching
Torque
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Summary:The cogging torque in flux-switching permanent magnet machines (FSPMs) is high due to its unique structure and high air-gap flux density. The cogging torque principle in FSPM is different from that in traditional PM machines, which can not be correctly predicted by analytical consideration. The aim of paper is to present the investigation on cogging torque principle in FSPM by analyzing the flux density distribution and a simple cogging torque reduction technique, i.e., teeth notching. Various kinds of notching schemes and their influence on cogging torque are examined along with instantaneous torque and average output torque at different load conditions. Numerical optimization process combined with finite-element analysis, which gives more preciseness to calculations, is performed to minimize cogging torque. The results show that the cogging torque circle depends on the real flux density distribution in the machine rather than the number of stator/rotor poles and the presented method can greatly reduce the torque ripple at only slight cost of average output torque.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2012.2200237