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Fringing in tubular permanent-magnet machines: Part II. Cogging force and its minimization

Wang, J.B., Howe, D. and Jewell, G.W. (2003) Fringing in tubular permanent-magnet machines: Part II. Cogging force and its minimization. IEEE Transactions on Magnetics, 39 (6). pp. 3517-3522. ISSN 0018-9464


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In Part I of the paper, analytical field solutions, which account for the fringing flux associated with the finite length of the ferromagnetic armature core in tubular permanent-magnet machines, are established. In Part II, the technique is applied to both slotless and slotted machines, and the results are verified by finite-element calculations. The analytical field solutions enable the resultant cogging force associated with the finite length of the armature to be determined as a function of the armature displacement, for both radially and Halbach magnetized stators. Thus, they not only provide an effective means for evaluating the influence of leading design parameters on the cogging force waveform, but also facilitate its minimization.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2003 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: cogging force minimization, linear machines, permanent-magnet machines
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: 07 Jun 2014 04:18
Published Version: http://dx.doi.org/10.1109/TMAG.2003.819449
Status: Published
Refereed: Yes
Identification Number: 10.1109/TMAG.2003.819449
URI: http://eprints.whiterose.ac.uk/id/eprint/828

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