Analytical Solution of Magnetic Field in High-Speed Permanent Magnet Synchronous Machines with Novel Composite Rotor

Jinyu Yao, Yue Zhang, Huijun Wang, Zhenyao Xu, Fengge Zhang, He Zhang

Research output: Journal PublicationArticlepeer-review


The paper presents novel composite magnetic materials(NCMMs) to solve the key issue of high rotor temperature rise and stress concentration in HSPMSMs. Utilize low conductivity and circumferential continuity of NCMMs, the topologies of HSPMSM with novel composite rotor (NCR-HSPMSM) are proposed. The NCR-HSPMSM contains two topologies. The first topology adopts the single excitation structure, and the excitation source only contains NCMMs. The second topology adopts the hybrid excitation structure, and the excitation source contains sintered permanent magnets and NCMMs. On the basis of conformal mapping, the general analytical solution of the open-circuit magnetic field in NCR-HSPMSM is obtained. In NCR-HSPMSM, the subdomain model is used to anticipate the armature reaction field. Also calculable are the back-EMF, cogging torque, and electromagnetic torque. The developed model is used to guide the machine design and save optimization time. Good agreement between predicted and finite element calculation is achieved. Compared with the conventional HSPMSM, the rotor eddy current loss and rotor strength are analyzed, and the electromagnetic performance are analyzed with different composition parameters of NCMMs by the developed model. And the materials properties are measured by experiment.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Transactions on Transportation Electrification
Publication statusAccepted/In press - 2023


  • Air gaps
  • analytical modeling
  • composite magnetic materials
  • electromagnetic analysis
  • high-speed permanent magnet synchronous machines
  • Magnetic fields
  • Magnetomechanical effects
  • Permanent magnets
  • Rotors
  • Stress
  • Topology

ASJC Scopus subject areas

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


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