Performance evaluation of five-phase outer-rotor Permanent magnet vernier machines

Maie Wefky, A. S.Abdel Khalik, Shehab Ahmed, I. F. El Arabawy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


With ever-increasing concerns on clean environment and global warming, there is special interest in electric vehicles (EVs) to be used instead of conventional vehicles with internal combustion engines (ICEs). Among competing machine types, permanent magnet (PM) brushless motor is the most commonly employed motor type for this technology due to their important advantages of high power density, high efficiency. Furthermore, higher fault tolerant capability at low speed which can be achieved by combining a coaxial magnetic gear (MG) with an outer rotor PM brushless machine resulting in a Permanent magnet vernier (PMV) machine. The performance of a fault-tolerant PMV machine depends on the proper selection of slots/poles combination which offers low speed/high torque operation and eliminates the effect of low order harmonics in the stator magneto motive force and hence reduces the vibration and stray loss. In this paper, three outer rotor five-phase PMV machines with the same dimensions and different slots/poles combinations are designed. The number of flux modulating poles (FMPs) is optimized to obtain better torque curves and efficiency. A simulation study is carried out using 2D-Finite element method (2D-FEM) to compare the performance of the three machines at rated condition.

Original languageEnglish (US)
Title of host publicationProceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society
PublisherIEEE Computer Society
Number of pages6
ISBN (Electronic)9781509034741
StatePublished - Dec 21 2016
Externally publishedYes
Event42nd Conference of the Industrial Electronics Society, IECON 2016 - Florence, Italy
Duration: Oct 24 2016Oct 27 2016

Publication series

NameIECON Proceedings (Industrial Electronics Conference)


Conference42nd Conference of the Industrial Electronics Society, IECON 2016


  • Electric vehicles (EVs)
  • Finite element method (FEM)
  • Flux modulating poles (FMPs)
  • Magnetic gear (MG)
  • Permanent magnet Vernier (PMV) machines

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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