'Electromaglev' ('Active-Magiev') - Magnetic levitation of a superconducting disk with a DC field generated by electromagnets: Part 2 Theoretical and experimental results on lift-to-weight ratio and lateral stiffness

Haigun Lee, Makoto Tsuda, Yukikazu Iwasa

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We present Part 2 results of a comprehensive study, both theoretical and experimental, of an electromaglev ('active-maglev') system, in which a YBCO bulk sample is levitated stably in a DC magnetic field generated by a magnet system located underneath the floating sample. The 0th-order theory presented in Part 1 is used to interpret experimental results of levitation stability, lift-to-weight ratio, and lateral stiffness for four YBCO samples: 1) disk; 2) annulus; 3) the same annulus with a permanent magnet disk placed in the hole; and 4) ring. Also presented is a procedure to induce in a sample a trapped flux that is shown experimentally to be essential for the sample to levitate tilt-free. Trapped flux is another requirement for levitation stablity; it is in addition to at least two degrees of freedom required on spatial supercurrent flow and certain spatial profiles imposed on the field generated by the magnet system.

Original languageEnglish
Pages (from-to)419-427
Number of pages9
JournalCryogenics
Volume38
Issue number4
DOIs
Publication statusPublished - 1998 Apr
Externally publishedYes

Bibliographical note

Funding Information:
Work supported in part by the U.S. Department of Energy, Office of Basic Sciences and in part by Daikin Industries MEC Laboratory, Tsukuba, Japan.

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

  • Active-Maglev
  • Electromaglev
  • Magnetic levitation
  • Supercurrent
  • Trapped flux
  • YBCO bulk samples

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy

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