Power Loss and Thermal Analysis of a MW High Speed Permanent Magnet Synchronous Machine

Yue Zhang, Sean McLoone, Wenping Cao, Fengyi Qiu, Chris Gerada

Research output: Contribution to journalArticlepeer-review


High speed permanent magnet synchronous machines (PMSMs) have attracted much attention due to their high power density, high efficiency, and compact size for direct-drive applications. However, the consequent power loss density is high and heat transfer is also deemed as a technical challenge. This is particularly the case for high-speed operation. In this paper, electromagnetic and mechanical power losses in a MW level high speed PMSM is comprehensively investigated by finite element analysis; the transient machine demagnetization performance is studied with the proposed rotor composite structure to improve the machine anti-demagnetization capability; the temperature distribution of the high speed PMSM is also analyzed by a fluid-thermal coupling method with calculated power loss. The high speed PMSM is prototyped and experimentally tested to validate the effectiveness of numerical models and calculated results.
Original languageEnglish
Pages (from-to)1468-1478
JournalIEEE Transactions on Energy Conversion
Issue number4
Early online date31 May 2017
Publication statusPublished - 1 Dec 2017

Bibliographical note

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Funding:Royal Society, UK and by the National Natural Science Foundation, China under Grant 5141101208


  • Demagnetization
  • finite element method
  • High speed PM machine
  • magnetic field
  • power loss
  • thermal analysis


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