Eccentric Reluctance and Permanent Magnet Synchronous Machines Comparison

Hanafy Mahmoud, Nicola Bianchi, Michele Degano, Mahir Al-Ani, Chris Gerada

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)


This paper deals with a comparative study between reluctance (REL), permanent magnet assisted reluctance (PMAREL), and surface mounted permanent magnet (PM) synchronous machines with rotor eccentricity. Static, dynamic, and combined eccentricity cases are considered. For the sake of generality, this comparison is carried out at different levels of air-gap flux density, as different current angles, different PM materials, and different number of magnetic poles. Additionally, different stator windings arrangements, i.e, distributed and fractional slot concentrated windings are taken into account. Besides, different rotor geometries of REL and PMAREL machines are included. As a case of study, 36-slot machine is analyzed, considering three flux barriers per pole; however, the study can be applied to any machine geometry. Due to the structural criticality of the rotor iron ribs of the REL machines, the impact of the eccentricity on the mechanical stress acting on those ribs and the deformation of the rotor is studied.

Original languageEnglish
Article number8387456
Pages (from-to)5760-5771
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number6
Publication statusPublished - 1 Nov 2018


  • Deformation analysis
  • eccentricity
  • finite-element (FE) analysis
  • mechanical stresses
  • permanent magnet assisted reluctance (PMAREL) machine
  • reluctance synchronous machine
  • structural analysis
  • surface mounted permanent magnet (SPM) machine

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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