Mechanical stability of a high-T/sub c/ superconducting levitation system

Author

Sugiura, T. ; Tashiro, M. ; Uematsu, Y. ; Yoshizawa, M.

Author_Institution

Dept. of Mech. Eng., Keio Univ., Yokohama, Japan

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

386

Lastpage

389

Abstract

This research deals with dynamics of a permanent magnet freely levitated above an excited high-T/sub c/ superconductor. Vertical restoring forces acting on the magnet were evaluated by analysis based on the critical state and flux flow models. The results show nonlinearity and frequency-dependence of the forces, which were observed in experiments. Vertical vibration properties of the system were also evaluated analytically by considering the above properties of the restoring forces. The results show good agreement with experimental ones, which include effect of the frequency-dependent stiffness on the resonant frequency, the primary resonance characteristics, stability of the steady-state motions and so on.

Keywords

flux flow; high-temperature superconductors; magnetic levitation; superconducting magnets; critical state; flux flow models; frequency-dependence; frequency-dependent stiffness; high-T/sub c/ superconductors; permanent magnet levitation; primary resonance characteristics; resonant frequency; steady-state motion; superconducting levitation system; vertical restoring forces; vertical vibration properties; Magnetic analysis; Magnetic flux; Magnetic levitation; Permanent magnets; Resonance; Resonant frequency; Stability; Steady-state; Superconducting magnets; Vibrations;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614510

Filename

614510