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Electromaglev ("active-maglev"): magnetic levitation of a superconducting disk with a direct current field generated by electromagnets. 3. Theoretical results on levitation height and stability.

Author(s) : TSUDA M., LEE H., IWASA Y.

Type of article: Article

Summary

The authors present Part 3 results of a comprehensive theoretical study of an "electromaglev" ("active-maglev") system, in which a high-temperature superconducting bulk YBCO sample is levitated stably in a direct-current magnetic field generated by a magnet system. Field solutions have been obtained numerically to compute levitation height and define stability criteria for the superconducting disk sample. The analysis assumes that the disk, which other wise obeys the Bean critical-state model, traps flux when cooled in the presence of a field from the normal state to the superconducting state. Procedures to produce stable, tilt-free levitation are described. Agreement between experiment and analysis on dependence of levitation height on magnet current is quite good. The analysis also shows that to achieve stable levitation, a YBCO ring sample requires a radial build that is sufficiently thick to permit the supercurrent to flow in the radial direction.

Details

  • Original title: Electromaglev ("active-maglev"): magnetic levitation of a superconducting disk with a direct current field generated by electromagnets. 3. Theoretical results on levitation height and stability.
  • Record ID : 1999-3347
  • Languages: English
  • Source: Cryogenics - vol. 38 - n. 7
  • Publication date: 1998/07

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