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Effects of MMF Harmonics on Rotor Eddy-Current Losses for Inner-Rotor Fractional Slot Axial Flux Permanent Magnet Synchronous Machines

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4 Author(s)
Jian Li ; Dept. of Electr. Eng., Dong-A Univ., Busan, South Korea ; Da-Woon Choi ; Dong-Hyeok Son ; Yun-Hyun Cho

This paper proposed a semi-analytical method for calculating eddy-currents losses in an inner-rotor type axial flux permanent magnet machine (AFPM), which have surface-mounted PM rotor structure and inserted PM rotor structure. The fractional slot concentrated winding has large amount of magneto-motive force (MMF) harmonics, which induce extra eddy-current losses in rotor. In the proposed method, each MMF harmonic is applied to a simplified finite element analysis model which is treated as time-harmonic magnetic problem, and the losses of each order are superposed. Various fractional slot winding designs are studied when equipped two different rotor structures.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 2 )

Date of Publication:

Feb. 2012

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