Proof-of-concept of a millisecond-scale electromagnetic levitator using high-temperature superconducting coils

Jiho Lee, Seokho Nam, Seunghyun Song, Hongwoo Jin, Tae Kuk Ko

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper proposes a millisecond-scale electromagnetic levitator using high-temperature superconducting (HTS) coils. The proposed apparatus consists of an AC power supply, short-circuit switches, an aluminum plate, and two HTS coils. The HTS coils are wound in opposite directions and electrically connected in parallel. Thus, in a symmetric current distribution, the magnetic fluxes generated by the two HTS coils ideally cancel each other. However, in a sudden asymmetric current distribution created by the short-circuit switches, the magnetic fluxes are not cancelled, and the effective magnetic flux induces an eddy current in the aluminum plate placed above the HTS coils. The magnetic flux generated by the eddy current in the aluminum plate and the effective magnetic flux generated by the HTS coils together generate the repulsive force to levitate the aluminum plate. In this paper, numerical calculations and experimental verification of the repulsive force are performed. We show that this apparatus is able to provide a levitation force that we expect will be helpful for devices that need fast switching behavior of the levitation force.

Original languageEnglish
Article number6983590
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - 2015 Jun 1

Fingerprint

Magnetic flux
coils
magnetic flux
electromagnetism
Aluminum
aluminum
levitation
short circuits
current distribution
Eddy currents
eddy currents
Short circuit currents
Temperature
switches
Switches
power supplies
Superconducting coils
alternating current

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "This paper proposes a millisecond-scale electromagnetic levitator using high-temperature superconducting (HTS) coils. The proposed apparatus consists of an AC power supply, short-circuit switches, an aluminum plate, and two HTS coils. The HTS coils are wound in opposite directions and electrically connected in parallel. Thus, in a symmetric current distribution, the magnetic fluxes generated by the two HTS coils ideally cancel each other. However, in a sudden asymmetric current distribution created by the short-circuit switches, the magnetic fluxes are not cancelled, and the effective magnetic flux induces an eddy current in the aluminum plate placed above the HTS coils. The magnetic flux generated by the eddy current in the aluminum plate and the effective magnetic flux generated by the HTS coils together generate the repulsive force to levitate the aluminum plate. In this paper, numerical calculations and experimental verification of the repulsive force are performed. We show that this apparatus is able to provide a levitation force that we expect will be helpful for devices that need fast switching behavior of the levitation force.",
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Proof-of-concept of a millisecond-scale electromagnetic levitator using high-temperature superconducting coils. / Lee, Jiho; Nam, Seokho; Song, Seunghyun; Jin, Hongwoo; Ko, Tae Kuk.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6983590, 01.06.2015.

Research output: Contribution to journalArticle

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