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Durham University

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Publication details for Dr Christopher Donaghy-Spargo

Donaghy-Spargo, C. M. (2017). Electromagnetic-Mechanical Design of Synchronous Reluctance Rotors with Fine Features. IEEE Transactions on Magnetics 53(11): 8206308.

Author(s) from Durham


This paper explores the trade-off between electromagnetic and mechanical performance when regarding the design of a synchronous reluctance machine rotor with fine features in the lamination profile – the analyzed machine consists of four rotor poles and its stator is equipped with single tooth coils. The change in the electromagnetic characteristics of the d and q axis reactance is explored for variation in radial and tangential rib width and the impact of increased rib width on the saliency ratio of the machine. It is shown that increased radial and tangential rib width impairs electromagnetic performance, with the tangential rib having the most pronounced effect on performance in this rotor design. The mechanical performance of the design is also explored in a similar manner, where it is shown that the high stress concentration in the rotor radial & tangential ribs limits the maximum speed of the machine in the field weakening region. The radial rib is found to have the dominant impact on supporting the flux guides. It is shown that the prototyped machine can achieve good electromagnetic performance while maintaining mechanical integrity up to a 25% over speed of 10,000rpm with features as small as 0.3mm. Additionally, the challenges associated with manufacturing, selecting a higher rotor pole number and the possibility of mechanical failure are also discussed in the context of electromagnetic-mechanical design of such rotors, with important avenues of further research suggested.