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Improved analytical model for predicting the magnetic field distribution in brushless permanent-magnet machines

Zhu, Z.Q., Howe, D. and Chan, C.C. (2002) Improved analytical model for predicting the magnetic field distribution in brushless permanent-magnet machines. IEEE Transactions on Magnetics, 38 (1 (Par). pp. 229-238. ISSN 0018-9464


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A general analytical technique predicts the magnetic field distribution in brushless permanent magnet machines equipped with surface-mounted magnets. It accounts for the effects of both the magnets and the stator windings. The technique is based on two-dimensional models in polar coordinates and solves the governing Laplacian/quasi-Poissonian field equations in the airgap/magnet regions without any assumption regarding the relative recoil permeability of the magnets. The analysis works for both internal and external rotor motor topologies, and either radial or parallel magnetized magnets, as well as for overlapping and nonoverlapping stator windings. The paper validates results of the analytical models by finite-element analyses, for both slotless and slotted motors

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: electrical machines, magnetic field, permanent magnet
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 12 Dec 2005
Last Modified: 04 Jun 2014 11:11
Published Version: http://dx.doi.org/10.1109/20.990112
Status: Published
Refereed: Yes
Identification Number: 10.1109/20.990112
URI: http://eprints.whiterose.ac.uk/id/eprint/874

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