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Investigating Synchronous Reluctance Rotor Performance for Traction Applications against a Permanent Magnet Benchmark

Connor, Peter H.; Khowja, Muhammad; La Rocca, Antonino; La Rocca, Salvatore; Zou, Tianjie; Vakil, Gaurang; Walker, Adam; Gerada, Chris; Paciura, Krzysztof


Senior Application Engineers in Industrialisation of Electrical Machines and Drives

Antonino La Rocca

Adam Walker

Krzysztof Paciura


This paper investigates the potential benefits for the use of synchronous reluctance machines for traction applications. Permanent magnet machines are often used to generate the highest power densities. However, magnet use has drawbacks including temperature limits requiring localised, intensive, and often complex and expensive cooling strategies. In addition, ethical, environmental, geopolitical, and economic concerns impact short term market fluctuations and long-term demand. In this paper a benchmark PM machine has been taken, and an alternative synchronous reluctance rotor has been designed. The purpose was to identify how much performance could be maintained through improved multi-physics analysis and the design freedom that magnet removal enabled. Performance and cost comparisons are presented. The synchronous reluctance design has 65% of the active material cost of the PM machine yet maintains 94% of the torque density. The result of these changes is a 31% saving in terms of cost per unit torque density.

Conference Name 2022 International Conference on Electrical Machines (ICEM)
Conference Location Valencia, Spain
Start Date Sep 5, 2022
End Date Sep 8, 2022
Acceptance Date Aug 31, 2022
Online Publication Date Oct 13, 2022
Publication Date Sep 5, 2022
Deposit Date Nov 11, 2022
Publisher Institute of Electrical and Electronics Engineers
Series Title International Conference on Electrical Machines (ICEM)
ISBN 9781665414333
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