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Impact of Soft Magnetic Material on Design of High-Speed Permanent-Magnet Machines

Fernando, Nuwantha; Vakil, Gaurang; Arumugam, Puvaneswaran; Amankwah, Emmanuel K.; Gerada, C.; Bozhko, Serhiy

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Nuwantha Fernando

Puvaneswaran Arumugam

Emmanuel K. Amankwah


© 2016 IEEE. This paper investigates the effect of two soft magnetic materials on a high-speed machine design, namely, 6.5% silicon steel and cobalt-iron alloy. The effect of design parameters on the machine performance as an aircraft starter-generator is analyzed. The material properties which include B-H characteristics and the losses are obtained at different frequencies under an experiment and used to predict the machine performance accurately. In the investigation presented in this paper, it is shown that machines designed with 6.5% silicon steel at a high core flux density has lower weight and lower losses than the cobalt-iron alloy designs. This is mainly due to the extra weight contributed by the copper content especially in the end-windings. Due to the high operating frequencies, the core losses in the cobalt-iron machine designs are found to outweigh the copper losses incurred in the silicon steel machines. It is also shown that change in stack length/number of turns has a considerable effect on the copper losses at starting, however has no significant advantage on rated efficiency which happens to be in a field-weakening operating point. It is also shown that the performance of the machine designs depends significantly on material selection and the operating point of the core. The implications of the variation of design parameters on the machine performance is discussed and provide insight into the influence of parameters that effect overall power density.

Journal Article Type Article
Acceptance Date May 9, 2016
Online Publication Date Jul 7, 2016
Publication Date 2017-03
Deposit Date Jun 23, 2016
Publicly Available Date Jul 7, 2016
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 64
Issue 3
Pages 2415-2423
Keywords Aircraft, cobalt steel, flux density, high speed, machine design, soft magnetic material, silicon steel
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Additional Information © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.


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