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Effect of optimal torque control on rotor loss of fault-tolerant permanent-magnet brushless machines

Ede, J.A., Atallah, K., Wang, J.B. and Howe, D. (2002) Effect of optimal torque control on rotor loss of fault-tolerant permanent-magnet brushless machines. IEEE Transactions on Magnetics, 38 (5 (par). pp. 3291-3293. ISSN 0018-9464


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A faulted phase in a fault-tolerant permanent-magnet brushless machine can result in significant torque ripple. However, this can be minimized by using an appropriate optimal torque control strategy. Inevitably, however, this results in significant time harmonics in the phase current waveforms, which when combined with inherently large space harmonics, can result in a significant eddy-current loss in the permanent magnets on the rotor. This paper describes the optimal torque control strategy which has been adopted, and discusses its effect on the eddy-current loss in the permanent magnets of four-, five-, and six-phase fault-tolerant machines.

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: brushless machines, eddy currents
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: 09 Jun 2014 02:01
Published Version: http://dx.doi.org/10.1109/TMAG.2002.802294
Status: Published
Refereed: Yes
Identification Number: 10.1109/TMAG.2002.802294
URI: http://eprints.whiterose.ac.uk/id/eprint/831

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