Reduction of open-circuit DC-winding-induced voltage in wound field switched flux machines by skewing

Z. Z. Wu, Z. Q. Zhu, C. Wang, J. C. Mipo, S. Personnaz, P. Farah

Research output: Contribution to journalArticlepeer-review

38 Citations (SciVal)


In this paper, the open-circuit dc-winding-induced voltage in a wound field switched flux (WFSFs) machines is analyzed. The phenomenon of open-circuit dc-winding-induced voltage is illustrated and the mechanism is explained. Rotor skewing is proposed to reduce the open-circuit dc-winding-induced voltage, and the optimal skewing angle is analytically derived based on the analytically deduced harmonic orders of the open-circuit dc-winding-induced voltage. Finite-element (FE) analyses show that the open-circuit dc-winding-induced voltages in the analyzed 12-stator-pole partitioned stator WFSF machines having 10-, 11-, 13-, and 14-rotor-pole rotors can be effectively reduced by >94%, while the ac-winding phase-fundamental back-EMFs can be maintained by >95%. Twelve/ten-stator/rotor-pole prototypes with skewed and nonskewed rotors are built and tested to verify the analytical and FE results.

Original languageEnglish
Article number8365132
Pages (from-to)1715-1726
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number3
Early online date24 May 2018
Publication statusPublished - 1 Mar 2019


  • AC winding
  • dc winding
  • dc-winding-induced voltage
  • field winding
  • flux switching
  • open circuit
  • skewing
  • step skewing
  • wound field switched flux (WFSF) machine

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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