Magnetic Bearings for Cryogenic Turbomachines

  • Victor Iannello
  • Herbert Sixsmith
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 37)


Magnetic bearings offer a number of advantages over gas bearings for the support of rotors in cryogenic turboexpanders and compressors. Their performance is relatively independent of the temperature or pressure of the process gas for a large range of conditions. Active magnetic bearing systems that use capacitive sensors have been developed for high speed compressors for use in cryogenic refrigerators. Here, the development of a magnetic bearing system for a miniature ultra high speed compressor is discussed. The magnetic bearing has demonstrated stability at rotational speeds exceeding 250,000 rpm. This paper describes the important features of the magnetic bearing and presents test results demonstrating its performance characteristics.


Bias Field Magnetic Bearing High Frequency Signal Pole Ring Active Magnetic Bearing 
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  1. 1.
    H. Sixsmith et al, Long-life, closed-cycle for space, in: “Proceedings of the Fourth International Cryocoolers Conference,” Easton, MD (July 1987).Google Scholar
  2. 2.
    H. Sixsmith et al, Small turbo-brayton cryocoolers, in: “Advances in Cryogenic Engineering,” St. Charles, IL (1987).Google Scholar

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Victor Iannello
    • 1
  • Herbert Sixsmith
    • 1
  1. 1.Creare IncorporatedHanoverUSA

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