Analysis of Rotor Losses in Permanent Magnet Vernier Machines

Liang Xu, Wenxiang Zhao, Rende Li, Shuangxia Niu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)


This paper investigates rotor losses in permanent magnet Vernier machines. By analyzing air-gap field, the harmonic distribution and frequency of modulated open-circuit flux density and armature reaction flux density are obtained. Then, rotor losses production principle is revealed and the influence of each harmonic on the loss is analyzed. Meanwhile, the influence of each harmonic on torque is also studied. It is found that some harmonics have no contribution to torque but produce additional losses. On this basis, a new rotor structure is proposed to suppress the rotor losses. Comparison results indicate that by suppressing non-working harmonics, the rotor losses can be reduced effectively without affecting the effective torque. Finally, the theoretical and finite-element analysis results are verified by prototype tests.

Original languageEnglish
Article number9374774
JournalIEEE Transactions on Industrial Electronics
Publication statusAccepted/In press - Mar 2021


  • Field modulation
  • finite-element analysis
  • harmonic analysis
  • permanent magnet Vernier machine
  • rotor losses

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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