'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

doi:10.1016/S0011-2275(97)00163-X

'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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	419-427
Number of pages	9
Journal	Cryogenics
Volume	38
Issue number	4
DOIs	https://doi.org/10.1016/S0011-2275(97)00163-X
Publication status	Published - 1998 Apr
Externally published	Yes

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

Access to Document

10.1016/S0011-2275(97)00163-X

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'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. / Lee, Haigun; Tsuda, Makoto; Iwasa, Yukikazu.
In: Cryogenics, Vol. 38, No. 4, 04.1998, p. 419-427.

Research output: Contribution to journal › Article › peer-review

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title = "'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",

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.",

keywords = "Active-Maglev, Electromaglev, Magnetic levitation, Supercurrent, Trapped flux, YBCO bulk samples",

author = "Haigun Lee and Makoto Tsuda and Yukikazu Iwasa",

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.",

year = "1998",

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doi = "10.1016/S0011-2275(97)00163-X",

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AU - Tsuda, Makoto

AU - Iwasa, Yukikazu

N1 - 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.

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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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KW - Supercurrent

KW - Trapped flux

KW - YBCO bulk samples

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'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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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