A Low Coupling Fault Tolerant PMA-SynRM With Mixed-Pitch Segregated Windings

Bo Wang, Xiaobao Feng, Jiayao Bao, Wenhan Xu, Jiabin Wang, Wei Hua, Ming Cheng, Shuangxia Niu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


Mutual coupling effect between different winding modules causes undesirable effects for the fault tolerant machine drives, such as current distortion, torque ripple, and increased fault current. In this article, a mixed-pitch segregated winding configuration is presented for a triple modular fault tolerant permanent magnet (PM)-assisted synchronous reluctance machine (PMA-SynRM). It exhibits less mutual coupling effect between the different winding sets, which leads to improved fault tolerance compared to the existing full-pitched segregated windings. The mutual coupling effect is described by deriving the magnetomotive force (MMF) profile, and the fault tolerant performance improvement is proven by detailed finite-element (FE) analysis and prototyping tests in healthy and various fault conditions. The results confirm that the presented winding machine has the same healthy performance as the conventional full-pitched windings, and it operates in a more balanced manner with less current distortion and lower turn fault current. It will become a more competing candidate for the safety critical applications.

Original languageEnglish
Pages (from-to)4549-4559
Number of pages11
JournalIEEE Transactions on Transportation Electrification
Issue number4
Publication statusPublished - 1 Dec 2022


  • Fault tolerant
  • magnetomotive force (MMF)
  • multiple 3-phase
  • mutual coupling
  • turn short-circuit fault

ASJC Scopus subject areas

  • Automotive Engineering
  • Transportation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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