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Multi-physics Design Optimisation of PM-assisted Synchronous Reluctance Motor for Traction Application

Al-Ani, Mahir; Walker, Adam; Vakil, Gaurang; Ramanathan, Ramkumar; Zou, Tianjie; La Rocca, Salvatore; La Rocca, Antonino; Gerada, David; Gerada, Chris; Paciura, Krzysztof; McQueen, Alastair


Mahir Al-Ani

Ramkumar Ramanathan

Antonino La Rocca

Principal Research Fellow in Electrical Machines

Krzysztof Paciura

Alastair McQueen


Recently, the synchronous reluctance machine limits have been pushed toward meeting the requirements of traction applications. A skilled electromagnetic architecture of a synchronous reluctance machine with the help of permanent magnets can push the limits of power density and speed range to that of traction applications, however, the mechanical integrity of the rotor can still be in question. A traction application means large rotor diameter and high rotational speed, two criteria that makes a challenging design, in particular, mechanically. In this paper, the multi-physics design steps of a permanent magnets assisted synchronous reluctance motor for automotive application, have been presented. Firstly, the electromagnetic design following the size and thermal aspects and constrains has been conducted. Secondly, methods to reduce the mechanical stress has been explored and a bridged mechanical design has been adapted. Finally, thermal analysis of the machine has been conducted to ensure the thermal limits have been satisfied.


Al-Ani, M., Walker, A., Vakil, G., Ramanathan, R., Zou, T., La Rocca, S., …McQueen, A. (2019). Multi-physics Design Optimisation of PM-assisted Synchronous Reluctance Motor for Traction Application. .

Conference Name IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
Start Date Oct 14, 2019
End Date Oct 17, 2019
Acceptance Date Jul 12, 2019
Online Publication Date Dec 9, 2019
Publication Date 2019-10
Deposit Date Feb 6, 2020
Publicly Available Date Feb 7, 2020
Publisher Institute of Electrical and Electronics Engineers
ISBN 9781728148786
Keywords Synchronous reluctance, PM assisted, Mechanical stress, Mechanical design, IPM, Traction application, Automotive application
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