Analysis of the operation principle for rotor-permanent-magnet flux-switching machines

Peng Su, Wei Hua, Zhongze Wu, Peng Han, Ming Cheng

Research output: Contribution to journalArticlepeer-review

51 Citations (SciVal)


This paper proposes a topology of special rotor-type permanent-magnet (PM) machine named rotor-PM flux-switching (RPM-FS) machine, which is evolved from stator-PM flux-switching (SPM-FS) topology and exhibits high power density, wide-range speed regulation, and good overload capability. The operation principle of RPM-FS machines is investigated based on the field modulation theory. It can be found that the torque is mainly contributed by the dominant harmonics in rotor-PM field and armature reaction field with the same order and rotating speed, i.e., 10, 14, and 34 pole pairs. In addition, a comprehensive comparison of modulation principles between the RPM-FS and SPM-FS machines is conducted from three perspectives, namely PM field, armature reaction field, and torque production mechanism. It is found that the modulation principle not only reveals the similarities of operation principle between two PM-FS machines, but also provides guidance for the combination of stator slots and rotor poles. Further, the electromagnetic torque produced by the dominant harmonics in two machines is verified by finite-element analysis and experiments.

Original languageEnglish
Article number2733442
Pages (from-to)1062-1073
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number2
Publication statusPublished - 29 Jul 2017


  • Field modulation
  • Flux-switching (FS)
  • Harmonic analysis
  • Rotor permanent magnet (PM)
  • Stator PM
  • Switched flux

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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