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Development of a compressor for a miniature pulse tube cryocooler of 2.5 W at 65 K.

Author(s) : MATSUMOTO N., YASUKAWA Y., OHSHIMA K., et al.

Summary

The Fuji Electric group has developed crucial technologies with high reliability for Stirling cryocoolers targeted for space missions. For commercial applications, a miniature pulse tube cryocooler with a heat lift of 2 W to 3 W at 70 K using 100 W electric power input has developed and is being marketed. A moving magnet motor has been introduced to the driving system in order to achieve better compactness and higher efficiency in place of the moving coil in a conventional system that had about 65% efficiency. The compressor performs a total compression work of 75 W with 90% efficiency and has a life longer than 50,000 hours. One intended application is the cooling of a high temperature superconductive device for a wireless telecommunication system. The authors began by designing a motor structure and running experiments on basic elements because a moving magnet system is a new technology to Fuji. At first the magnetic circuit for element tests was evaluated by a basic equation and computed by general-purpose FEM software. The results from the element tests and calculated data were used for the next design. For bearing support magnets, the authors considered various approaches. This paper describes the development status of the compressor, including the motor design and the primary test results.

Details

  • Original title: Development of a compressor for a miniature pulse tube cryocooler of 2.5 W at 65 K.
  • Record ID : 2008-1061
  • Languages: English
  • Publication date: 2006/06/14
  • Source: Source: Proc. 14th int. Cryocooler Conf., Annapolis, MD
    327-333; fig.; phot.; 2 ref.

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