Electromagnetic Force and Torque in High- Tc Superconducting Levitation and Rotational Motion of its Levitated Body

Toshihiko Sugiura, Tsuyoshi Tanaka, Masashi Hibino, Masatsugu Yoshizawa

Research output: Contribution to journalArticlepeer-review


This research deals with evaluation of electromagnetic force and torque acting on a permanent magnet (PM) above a high-Tc superconductor (HTSC) and discusses dynamics of a spinning PM freely levitated above a HTSC. Force and torque were evaluated experimentally as functions of both displacement and tilting angle of the PM. Experimental results show that the force and torque acting on the PM are almost equivalent to ones acting on a rotor supported by an overhung shaft with a frictionless bearing. By theoretical analysis based on the above evaluation of the force and torque, dynamical behavior of a spinning PM was examined. Predicted whirling and precession of the PM were observed in experiments of rotation.

Original languageEnglish
Pages (from-to)1489-1494
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number645
Publication statusPublished - 2000


  • Critical Speed
  • Eccentricity
  • High- Tc Superconductor
  • Magnetic Stiffness
  • Precession
  • Superconducting Bearing
  • Whirl

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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