A Novel Hybrid Dual-PM Machine Excited by AC with DC Bias for Electric Vehicle Propulsion

Qingsong Wang, Shuangxia Niu, Xiang Luo

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


This paper proposes a novel hybrid-excited dual-PM machine for electric vehicle propulsion. The key is to use an integrated stator winding to replace the armature winding and the field winding in the conventional hybrid-excited machine. The stator winding is excited by ac current with dc bias, in which the ac component is used to produce the rotating armature field, while the dc bias current is used for the flux regulation. Therefore, the function of the ac and dc windings can be incorporated and realized by using just one set of winding. The torque density and flux regulating capability can be improved, and the winding configuration is also simplified. In addition, dual-PM excitation structure combines the advantage of stator-PM doubly salient machine and rotor-PM magnetic-geared machine, which can further enhance the torque capability. The operating principle and control strategy of the proposed machine are discussed. The electromagnetic performances are studied using the time-stepping finite-element method. A machine prototype is manufactured and experimental tests are conducted to verify the effectiveness of the machine design.
Original languageEnglish
Pages (from-to)6908-6919
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number9
Early online date15 Mar 2017
Publication statusPublished - Sept 2017
Externally publishedYes


  • DC bias
  • dual-PM
  • flux regulation
  • hybrid-excited machine


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