Comparative study of partitioned stator machines with different PM excitation stators

Z. Q. Zhu, Hao Hua, Di Wu, J. T. Shi, Z. Z. Wu

Research output: Contribution to journalArticlepeer-review

48 Citations (SciVal)


The partitioned stator (PS) machine adopts two stators to allocate windings and permanent magnets (PMs) separately, increasing the space for PMs as well as armature coils to boost the electromagnetic torque and improving the thermal condition of PMs. In this paper, the PS switched-flux PM (PS-SFPM) machine and the PS flux reversal PM (PS-FRPM) machine are proved to inherently share the same operating principle and similar machine topology but with interior PM (IPM) and surface-mounted PM stators, respectively. Furthermore, four globally optimized PS machines with different inner stator topologies are compared in terms of back EMF, cogging torque, electromagnetic torque, torque per PM volume, and flux-weakening capability. The results reveal that the spoke-shaped IPM (IPM-spoke) inner stator exhibits the highest back EMF and hence the highest average torque, while the I-shaped IPM (IPM-I) stator has the best flux-weakening capability, and the V-shaped IPM (IPM-V) produces the highest torque per PM volume. Furthermore, four machines are redesigned with the same PM usage volume, and the results show that the PS-SFPM machine still exhibits the highest back EMF as well as torque although with sacrificed advantages. The finite-element analyses and experiments are used to confirm the predictions.

Original languageEnglish
Article number7244229
Pages (from-to)199-208
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number1
Publication statusPublished - 1 Jan 2016


  • Dual stator
  • Flux reversal
  • Partitioned stator (PS)
  • Permanent magnet (PM)
  • Switched flux

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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