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Analytical Modeling of Open-Circuit Air-Gap Field Distributions in Multisegment and Multilayer Interior Permanent-Magnet Machines

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4 Author(s)
Li Zhu ; Dept. of Electr. Eng., Shanghai Jiao Tong Univ., Shanghai, China ; S. Z. Jiang ; Z. Q. Zhu ; C. C. Chan

We present a simple lumped magnetic circuit model for interior permanent-magnet (IPM) machines with multisegment and multilayer permanent magnets. We derived analytically the open-circuit air-gap field distribution, average air-gap flux density, and leakage fluxes. To verify the developed models and analytical method, we adopted finite-element analysis (FEA). We show that for prototype machines, the errors between the FEA and analytically predicted results are <1% for multisegment IPM machines and <2% for multilayer IPM machines. By utilizing the developed lumped magnetic circuit models, the IPM machines can be optimized for maximum fundamental and minimum total harmonic distortion of the air-gap flux density distribution.

Published in:

IEEE Transactions on Magnetics  (Volume:45 ,  Issue: 8 )