'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 journalArticle

8 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
Publication statusPublished - 1998 Apr 1
Externally publishedYes

Fingerprint

Magnetic levitation
Electromagnets
electromagnets
levitation
Magnets
stiffness
direct current
Stiffness
Fluxes
Permanent magnets
annuli
Magnetic fields
magnets
permanent magnets
floating
degrees of freedom
requirements
rings
profiles
magnetic fields

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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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.",
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T2 - Part 2 Theoretical and experimental results on lift-to-weight ratio and lateral stiffness

AU - Lee, Haigun

AU - Tsuda, Makoto

AU - Iwasa, Yukikazu

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N2 - 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.

AB - 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.

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