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Analytical Prediction and Experimental Verification of Electromagnetic Performance of a Surface-Mounted Permanent Magnet Motor having a Fractional Slot/Pole Number Combination

Journal of Magnetics, Volume 19, Number 1, 31 Mar 2014, Pages 84-89

Sang-A Hong (Department of Electrical Engineering, Chungnam National University), Jang-Young Choi *

(Department of Electrical Engineering, Chungnam National University), Seok-Myeong Jang (Department of Electrical Engineering, Chungnam National University)

Abstract

This paper presents an analytical prediction and experimental verification of the electromagnetic performance of a parallel magnetized surface-mounted permanent magnet (SPM) motor having a fractional number of slots per pole combination. On the basis of a two-dimensional (2-D) polar coordinate system and a magnetic vector potential, analytical solutions for flux density produced by the permanent magnets (PMs) and stator windings are derived. Then, analytical solutions for back-electromotive force (emf) and electromagnetic torque are derived from these field solutions. The analytical results are thoroughly validated with 2-D nonlinear finite element (FE) analysis results. Finally, the experimental back-emf and electromagnetic torque measurements are presented to test the validity of the analysis.

Keywords: surface-mounted permanent magnet motor; fractional number of slots per pole combination; analytical solutions

DOI: http://dx.doi.org/10.4283/JMAG.2014.19.1.084

Full Text: PDF

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