This paper presents an alternative permanent magnet rotor containment technology. The use of a semipermeable material in a laminated structure is shown to result in a significant improvement in magnetic loading for a given thickness of containment compared to the use of magnetically inert materials such as carbon fiber or Inconel, while minimizing eddy current losses in the containment layer. An analytical model is presented for determining the air-gap field delivered from a permanent magnet array with a semipermeable containment. The analysis is validated through finite element analysis. The fabrication of a prototype machine is detailed and the results presented show good agreement with the analysis. The validated modeling process is used to assess the potential of the new technology.

Translated title of the contributionAnalysis of Semi-Permeable Containment Sleeve Technology for High-Speed Permanent Magnet Machines
Original languageEnglish
Pages (from-to)646-653
Number of pages8
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - Sep 2012


  • Brushless permanent magnet (PM) machines
  • high-speed machines
  • magnetic loading
  • rotor containment

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