Research in Engineering and Aviation

Analytical open-circuit magnetic field distribution of slotless brushless permanent-magnet machines with rotor eccentricity

December 2011

Author(s): Rahideh, A., Korakianitis, T.

Journal: IEEE Transactions on Magnetics, 47(12), art. no. 5893946, pp. 4791-4808. DOI: 10.1109/TMAG.2011.2159987

Abstract

Analytical expressions for the no-load magnetic field distribution of slotless brushless permanent-magnet (PM) machines with static, dynamic, and mixed rotor eccentricities are presented. The proposed analytical expressions can be used for slotless brushless PM machines with any radius-independent magnetization pattern. The analytical expressions and the results for six different magnetization patterns are presented. Based on the analytical magnetic field distribution, the line and phase back-electromotive force waveforms, local traction components and unbalanced magnetic forces are obtained. The analytical results are compared with those from finite-element analyses to validate the derived expressions.

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