Novel electrical machines having separate PM excitation stator

Zi Qiang Zhu, Zhong Ze Wu, David James Evans, Wen Qiang Chu

Research output: Contribution to journalArticlepeer-review

80 Citations (SciVal)


In this paper, novel electrical machines having a separate permanent magnet (PM) excitation stator are proposed based on a partitioned stator (PS) flux reversal (FR) PM (FRPM) machine. Different from the conventional FRPM machines with a single stator, the PS-FRPM machines have two stators with PMs surface mounted in one stator and the armature windings located in another stator. This paper investigates the electromagnetic performance of PS-FRPM machines with 12/10, 12/11, 12/13, and 12/14 stator/rotor-pole, together with the influence of leading design parameters. The torque characteristics of PS-FRPM machines are quantitatively compared with the conventional FRPM machines based on their globally optimized designs. It shows that the PS-FRPM machines can generally produce higher torque when the PMs are thicker and exhibit >56% higher torque density than that of the conventional FRPM machines. Even compared under the same PM volume, the proposed PS-FRPM machines can have larger torque due to better utilization of the inner space. The investigation is validated by both finite-element and experimental results.

Original languageEnglish
Article number6899675
JournalIEEE Transactions on Magnetics
Issue number4
Publication statusPublished - 16 Sept 2014


  • Flux reversal
  • partitioned stator (PS)
  • permanent magnet (PM)
  • surface mounted
  • torque density

ASJC Scopus subject areas

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


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