Analytical On-Load Subdomain Field Model of Permanent-Magnet Vernier Machines

ÖNER Y. , Zhu Z. Q. , Wu L. J. , Ge X., Zhan H., Chen J. T.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol.63, no.7, pp.4105-4117, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 63 Issue: 7
  • Publication Date: 2016
  • Doi Number: 10.1109/tie.2016.2532285
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.4105-4117


Permanent-magnet vernier machine (PMVM) is a relatively new type of PM machines. An analytical subdomain model accounting for tooth-tips and flux modulation poles is developed to accurately predict on-load field distributions in PMVMs. Based on two-dimensional (2-D) polar coordinate and magnetic vector potential, this method solves the Maxwell's equations in slot, air-gap, flux modulation pole slot (FMPS), and PM regions. Consequently, the electromagnetic performance such as cogging torque, back-electromotive force (EMF), electromagnetic torque, power factor, and magnet loss are calculated. In addition, the model can also be used for the evaluation of demagnetization withstand capability. The finite-element analysis (FEA) and experimental results validate the accuracy of the developed analytical model.