A design method of fractional-slot concentrated winding SPMSM using winding factor and inductance factor

Kan Akatsu, Shinji Wakui

Research output: Contribution to journalArticle

9 Citations (Scopus)


This paper proposed a calculation method of the torque and power density especially for the fractional-slot concentrated winding machines. The torque coefficient and the inductance coefficient to transform from m-slot/n-pole machine to 3-phase/2-pole machine are used. Some machines were designed and these torque densities and power densities are compared. Experimental results showed the effectiveness of the proposed calculation method and have good accordance with both calculation results and FEA results.

Original languageEnglish
Pages (from-to)1171-1179+9
JournalIEEJ Transactions on Industry Applications
Issue number11
Publication statusPublished - 2007 Dec 1



  • Concentrated winding
  • Fractional-slot pitch
  • PMSM
  • Power density
  • Torque density
  • Winding factor

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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