Use of high-temperature superconducting films in superconducting bearings.

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We have investigated the effect of high-temperature superconductor (HTS) films deposited on substrates that are placed above bulk HTSs in an attempt to reduce rotational drag in superconducting bearings composed of a permanent magnet levitated above the film/bulk HTS combination. According to the critical state model, hysteresis energy loss is inversely proportional to critical current density, J{sub c}, and because HTS films typically have much higher J{sub c} than that of bulk HTS, the film/bulk combination was expected to reduce rotational losses by at least one order of magnitude in the coefficient of fiction, which in turn is a measure ... continued below

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22 p.

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Cansiz, A. July 14, 1999.

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Description

We have investigated the effect of high-temperature superconductor (HTS) films deposited on substrates that are placed above bulk HTSs in an attempt to reduce rotational drag in superconducting bearings composed of a permanent magnet levitated above the film/bulk HTS combination. According to the critical state model, hysteresis energy loss is inversely proportional to critical current density, J{sub c}, and because HTS films typically have much higher J{sub c} than that of bulk HTS, the film/bulk combination was expected to reduce rotational losses by at least one order of magnitude in the coefficient of fiction, which in turn is a measure of the hysteresis losses. We measured rotational losses of a superconducting bearing in a vacuum chamber and compared the losses with and without a film present. The experimental results showed that contrary to expectation, the rotational losses are increased by the film. These results are discussed in terms of flux drag through the film, as well as of the critical state model.

Physical Description

22 p.

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INIS; OSTI as DE00011216

Medium: P; Size: 22 pages

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  • Cryogenic Engineering Conference, Montreal, Quebec (CA), 07/12/1999--07/16/1999

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  • Report No.: ANL/ET/CP-98175
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11216
  • Archival Resource Key: ark:/67531/metadc628060

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Office of Scientific & Technical Information Technical Reports

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  • July 14, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 10, 2017, 3:17 p.m.

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Cansiz, A. Use of high-temperature superconducting films in superconducting bearings., article, July 14, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc628060/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.