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Analytical magnetic field analysis of Halhach magnetized permanent-magnet machines

Xia, Z.P., Zhu, Z.Q. and Howe, D. (2004) Analytical magnetic field analysis of Halhach magnetized permanent-magnet machines. IEEE Transactions on Magnetics, 40 (4 (Par). pp. 1864-1872. ISSN 0018-9464

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Abstract

We develop analytical models for predicting the magnetic field distribution in Halbach magnetized machines. They are formulated in polar coordinates and account for the relative recoil permeability of the magnets. They are applicable to both internal and external rotor permanent-magnet machines with either an iron-cored or air-cored stator and/or rotor. We compare predicted results with those obtained by finite-element analyses and measurements. We show that the air-gap flux density varies significantly with the pole number and that an optimal combination of the magnet thickness and the pole number exists for maximum air-gap flux density, while the back iron can enhance the air-gap field and electromagnetic torque when the radial thickness of the magnet is small.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 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: 05 Jun 2014 16:33
Published Version: http://dx.doi.org/10.1109/TMAG.2004.828933
Status: Published
Refereed: Yes
Identification Number: 10.1109/TMAG.2004.828933
URI: http://eprints.whiterose.ac.uk/id/eprint/867

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