Establishing the Power Factor Limitations for Synchronous Reluctance Machines

Yi Wang, Dan Ionel, David G. Dorrell, Steven Stretz

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


This paper discusses a goodness index and introduces a badness factor for electric machines with a special reference to synchronous reluctance motors. This factor is then used in conjunction with a computationally efficient finite-element electromagnetic analysis and a differential evolution optimization algorithm in order to carry out a large-scale design study under comparable specifications with an induction motor. It is shown that for synchronous reluctance machines, careful rotor geometry optimization can improve the performance, and that the inherent limitations, including those for the power factor, can be systematically established. The correlations for specific average torque, copper and core losses, and efficiency are also discussed.

Original languageEnglish
Article number7120977
JournalIEEE Transactions on Magnetics
Issue number11
StatePublished - Nov 1 2015

Bibliographical note

Publisher Copyright:
© 2015 IEEE.


  • Design
  • differential evolution (DE)
  • finite-element analysis (FEA)
  • optimization
  • synchronous reluctance machine

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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