Comparison between dual-permanent-magnet-excited machines with fewer stator poles and fewer rotor poles

Yujun Shi, Shuangxia Niu, Jin Wei, Linni Jian, Ruifang Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


The purpose of this paper is to quantitatively compare two types of dual-permanent-magnet-excited (DPME) machines, one is with fewer stator poles and the other is with fewer rotor poles. Four different magnetization patterns of permanent magnets (PMs) are considered. Calculation results obtained using finite-element analysis demonstrate that with exactly the same usage of magnets and copper windings, the DPME machine with fewer rotor poles can offer significantly higher electromagnetic torque than that with fewer stator poles, and the torque ripple of the DPME machine with fewer rotor poles is lower than that with fewer stator poles. Another finding is that DPME machines can offer satisfactorily high-torque capability only when the two sets of PMs are with the same magnetization directions.
Original languageEnglish
Article number7093497
JournalIEEE Transactions on Magnetics
Issue number3
Publication statusPublished - 1 Mar 2015


  • Direct drive
  • field modulation
  • permanent magnet (PM) machine
  • torque density

ASJC Scopus subject areas

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

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