Optimization of an 80 kW radial-radial flux compound-structure permanent-magnet synchronous machine used for HEVs

Yong Liu, Chengde Tong, Jingang Bai, Shuang Yu, Weiming Tong, Weinong Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


Compound-structure permanent-magnet synchronous machine (CS-PMSM), which is composed of a stator machine (SM) and a double-rotor machine (DRM), is a new power-split concept for hybrid electric vehicles (HEVs). To compare the CS-PMSM system with Toyota Prius based on the planetary gear unit, an 80 kW radial-radial flux prototype machine is designed. Fractional slots are employed for SM and DRM and the slot openings and pole-arc embraces of the two machines are optimized to decrease torque fluctuation. As the outer rotor is the structural and magnetic common part of SM and DRM, the magnetic circuits of the two machines are coupled. To obtain the thinner outer rotor and to decrease magnetic saturation of the outer rotor during machine design, the influences of the thickness and pole-arc embraces of permanent magnets on magnetic coupling are investigated by finite-element method. The magnetic field in the outer rotor may reach saturation, due to the impact of armature reaction on the flux distribution in the outer rotor. Under the condition of armature reaction, the flux distribution and electromagnetic torque are analyzed.
Original languageEnglish
Article number6028006
Pages (from-to)2399-2402
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 1 Oct 2011


  • Compound-structure permanent-magnet synchronous machine
  • fractional slots
  • hybrid electric vehicles
  • magnetic coupling
  • torque fluctuation

ASJC Scopus subject areas

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


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