Integrated radial and dual axial-flux variable-reluctance vernier machine

Daisuke Fukai, Shoji Shimomura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


Variable reluctance vernier machines, without any permanent magnets, can be driven by typical three phase voltage source inverters and can generate higher torque than other variable reluctance machines due to the magnetic gear effect. Nevertheless, conventional variable reluctance vernier machines have less torque density compared with permanent magnet machines. Therefore, we have proposed an integrated radial and dual axial-flux structure to improve the torque density and evaluated its performance using finite element analysis. Additionally, we have designed a miniaturized machine due to multipolarization and evaluated its performance. The proposed machine increased the torque density as 68% with compared to the conventional variable reluctance vernier machine with a single rotor. This paper describes the designs and torque performance of two proposed machines and two other machines, single- and dual-rotor machines, for comparison.

Original languageEnglish
Title of host publicationIECON Proceedings (Industrial Electronics Conference)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Electronic)9781479940325
Publication statusPublished - 2014 Feb 24

Publication series

NameIECON Proceedings (Industrial Electronics Conference)


  • Axial flux machine
  • Dual rotor
  • Integrated radial and dual axial-flux structure
  • Reluctance machine
  • Reluctance torque
  • Toroidal winding
  • Vernier machines

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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