Distribution Characteristic and Combined Optimization of Maximum Cogging Torque of Surface-Mounted Permanent-Magnet Machines

Jin Ping, Fang Shuhua, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


This paper examines the maximum cogging torque (MCT) distribution characteristic of surface-mounted permanent-magnet (SMPM) machines. The MCT distributions of SMPM machines with different pole-arc coefficients and different ratios of slot opening to slot pitch are studied using: 1) the Fourier series analysis together with the Maxwell stress tensor and 2) the finite-element method. Right triangle distribution regions of the optimal MCT are determined by comparing the MCT distribution contour maps obtained by the afore-mentioned two methods. Finally, a combined MCT optimization method for an SMPM with substantial savings in the optimization time, when compared with conventional methods, is proposed.
Original languageEnglish
Article number8200505
JournalIEEE Transactions on Magnetics
Issue number3
Publication statusPublished - 1 Mar 2018


  • Few slots permanent-magnet machines
  • maximum cogging torque (MCT)
  • right triangle distribution

ASJC Scopus subject areas

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

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