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On Selection of Rotor Support Material for a Ferrite Magnet Spoke-Type Traction Motor

Lookup NU author(s): Dr Kia Kimiabeigi, Dr James Widmer, Dr Richard Martin, Dr Timothy Lisle, Professor Barrie Mecrow



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Institute of Electrical and Electronics Engineers, 2016.

For re-use rights please refer to the publisher's terms and conditions.


Interior permanent-magnet motors with ferrite magnets and distributed windings can be a cost-effective alternative to rare-earth magnet-based motors for demanding applications such as automotive traction. Among different rotor topologies, the spoke type may be preferred, due to its advantages for high flux concentration and resistance to demagnetization, when carefully designed. When high-speed operation is required, to increase the power density of the motor, the spoke-type rotor must comprise two sections: 1) the ferromagnetic rotor pole to provide the path for the magnetic flux; and 2) the nonmagnetic rotor support to provide the structural integrity. In this paper, the multiphysics and cost implications of the rotor support material, as part of a high-performance ferrite magnet traction motor, are analyzed, and an optimal selection with respect to those criteria is proposed. The performance of the design based on the proposed rotor support material is validated by electromagnetic and structural testing of three sets of customized prototypes. Based on the analysis, the proposed rotor support material may, significantly, boost the cost competitiveness of a low-cost ferrite motor for high-volume production.

Publication metadata

Author(s): Kimiabeigi M, Widmer JD, Long R, Gao Y, Goss J, Martin R, Lisle T, Vizan JMS, Michaelides A, Mecrow BC

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2016

Volume: 52

Issue: 3

Pages: 2224-2233

Print publication date: 01/05/2016

Online publication date: 18/02/2016

Acceptance date: 01/01/1900

Date deposited: 14/07/2016

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: Institute of Electrical and Electronics Engineers


DOI: 10.1109/TIA.2016.2530722


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