Analysis and Reduction of On-Load DC Winding Induced Voltage in Wound Field Switched Flux Machines

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

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DC winding induced voltage pulsation in wound field switched flux (WFSF) machines causes dc winding current ripple and field excitation fluctuation, challenges the dc power source, and deteriorates the control performance. Hence, reducing this pulsation is important in the design of a WFSF machine. In this paper, based on the analytical models, rotor skewing and rotor iron piece pairing are proposed and comparatively investigated by the finite-element (FE) method to reduce the on-load dc winding induced voltage in WFSF machines having partitioned stators and concentrated ac windings. FE results show that peak-to-peak value of the on-load dc winding induced voltage in the analyzed 12/10-pole partitioned stator WFSF (PS-WFSF) machines can be reduced by 78.42% or 77.16% by using rotor skewing or rotor pairing, respectively, while the torque density can be maintained by >90%. As for the 12/11-, 12/13-, and 12/14-pole PS-WFSF machines, by using rotor iron piece inner arc pairing, the on-load dc winding induced voltage can be reduced by 64.11%, 52.12%, and 76.49%, respectively, while the torque density can be maintained by more than 90%. Prototypes are built and tested to verify the analytical and FE results.

Original languageEnglish
Article number8701561
Pages (from-to)2655-2666
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number4
Early online date29 Apr 2019
Publication statusPublished - 29 Apr 2020


  • AC winding
  • Vernier reluctance machine (VRM)
  • dc winding
  • dc winding induced voltage
  • field winding
  • on-load dc winding induced voltage
  • rotor iron piece pairing
  • skewing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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