Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Muhammad Azeem and Byungtaek Kim
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Muhammad Azeem: Department of Electrical Engineering, Kunsan National University, Gunsan-si 54150, Korea
Byungtaek Kim: Department of Electrical Engineering, Kunsan National University, Gunsan-si 54150, Korea

Energies, 2019, vol. 12, issue 17, 1-14

Abstract: This paper aims to present a general and effective analytical approach to calculate the air gap flux density and the back electromotive force (EMF) of a flux-switching permanent magnet (FSPM) machine. The proposed analytical expression of the air gap flux density is based on an improved air gap permeance function considering the geometries of slotted stator core pieces and magnets between stator teeth as well as the salient rotor poles. The back EMF equation is accurately derived using the proposed air gap flux density equation expressed in terms of practical machine dimensions and thus it provides the key design factors as well as details of the back EMF production mechanism. To validate the proposed analytical expressions, they are applied to the case study of a 12-slot 10-pole FSPM machine, and the finite element analysis results confirm the analytical predictions. Besides, for the proposed analytical model, the effects of the machine’s geometries on back EMF characteristics are investigated. The investigation shows that the ratio of rotor slot opening to slot pitch has a significant effect on the back EMF, and its optimal value is suggested. The proposed equations also provide a mean to choose the slot and pole combinations to obtain a higher power density.

Keywords: flux-switching machine; air gap flux density; back EMF; modulation flux; performance investigation; finite element analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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