Experimental Study on Oscillation Amplitude Reduction of a Superconducting Levitation System by an Electromagnetic Shunt Damper

Keisuke Uchino, Toshihiko Sugiura

Research output: Contribution to journalArticle


In this paper, we propose a new type of electromagnetic shunt damper where an air core coil is set above a floating magnet in a superconducting levitation system. The coil is connected to a shunt circuit consisting of a capacitance and a resistance. We have derived the optimal parameter values of capacitance C and resistance R from the fixed point theory after linearizing the governing equations and experimentally confirmed the effectiveness of the damper. We have also confirmed the electromagnetic coupling coefficient, which couples the mechanical system and the electric system and can be treated as a constant; as it is enhanced by the presence of the superconductor. Further, we have oscillated the superconductor and observed the amplitude of the floating magnet with and without the shunt damper. By the result, we have confirmed effective amplitude reduction by the shunt damper.

Original languageEnglish
Article number3602704
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - 2019 Aug 1



  • amplitude reduction
  • electromagnetic coupling
  • Electromagnetic shunt damper
  • fixed point theory
  • high-temperature superconductors
  • suppression

ASJC Scopus subject areas

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

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