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Analytical calculation of magnetic field distribution in the slotted air gap of a surface permanent-magnet motor using complex relative air-gap permeance

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3 Author(s)
Zarko, D. ; Dept. of Electr. Machines, Zagreb Univ., Croatia ; Ban, D. ; Lipo, T.A.

We present an analytical method for calculation of no-load magnetic field distribution in the slotted air gap of a surface permanent-magnet (PM) motor with radial or parallel magnetization. The method introduces the notion of complex relative air-gap permeance, calculated from the conformal transformation of the slot geometry, to take into account the effect of slotting. As a result, an accurate solution of both radial and tangential components of the flux density can be obtained which shows excellent agreement with the results of finite-element simulations. As an example of the effectiveness of the model, we present calculations of the back electromotive force and the cogging torque waveforms in a surface PM motor.

Published in:

Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 7 )

Date of Publication:

July 2006

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