Comparative Study of Surface-Mounted and Interior Permanent-Magnet Motors for High-Speed Applications

Jianning Dong, Yunkai Huang, Long Jin, Heyun Lin

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)


This paper investigates the surface-mounted permanent-magnet (SPM) and the interior permanent-magnet (IPM) motors for high-speed applications. An SPM motor and an IPM motor are designed with the same power/speed rate and the same key dimensions. Finite-element analysis is used to compare the mechanical, electromagnetic, and antidemagnetization performances of the two motors, and lumped parameter thermal networks are involved to compare their thermal performances. It can be concluded from the comparisons that the IPM motor has comparable electromagnetic performances with the SPM motor in high-speed operations, and its costs and torque per PM weight are superior to those of the SPM motor. However, its rotor structure is not as robust and is prone to irreversible demagnetization.

Original languageEnglish
Article number7370887
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - Jun 2016
Externally publishedYes


  • Finite element method
  • High speed permanent magnet motors
  • Interior permanent magnet (IPM)
  • Surface mounted magnet (SPM)


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