Design and analysis of a novel axial-flux electric machine

Siu Lau Ho, Shuangxia Niu, Weinong Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)


A novel low-speed axial-flux-modulated motor is proposed for in-wheel applications in hybrid electric vehicles. The proposed motor breaks the traditional design rule which stipulates that the pole-pair numbers of the stator and the rotor must be equal. Special ferrite segments in the air gap are used to modulate the magnetic field. It has the merit of having a very high torque density at low speed. It can be fitted into very limited space, such as inside the wheel rim of electric vehicles. Compared with radial-flux-modulated motors (RFMM), its manufacturing and assembling process are simple and easy. Its performance is compared with that of an RFMM using two-dimensional and three-dimensional finite-element methods and the comparison results verify the validity of this proposed machine design.
Original languageEnglish
Article number6027758
Pages (from-to)4368-4371
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 1 Oct 2011


  • Axial flux
  • electric motor
  • electric vehicle
  • finite element method
  • flux modulation
  • low speed
  • power density

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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