Mechanical stability of a high-Tc superconducting lévitation system

Toshihiko Sugiura; Masayuki Tashiro; Yoshitaka Uematsu; Masatsugu Yoshizawa

doi:10.1109/77.614510

Mechanical stability of a high-Tc superconducting lévitation system

Toshihiko Sugiura, Masayuki Tashiro, Yoshitaka Uematsu, Masatsugu Yoshizawa

Department of Mechanical Engineering

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

51 Citations (Scopus)

Abstract

This research deals with dynamics of a permanent magnet freely levitated above an excitedhigh-7"c superconductor. Vertical restoring forces acting on the magnet were evaluated by analysis based on fhe critical state and flux flow models. The results shownonlinearity 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 andso on.

Original language	English
Pages (from-to)	386-389
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	7
Issue number	2 PART 1
DOIs	https://doi.org/10.1109/77.614510
Publication status	Published - 1997

ASJC Scopus subject areas

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

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10.1109/77.614510

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AU - Tashiro, Masayuki

AU - Uematsu, Yoshitaka

AU - Yoshizawa, Masatsugu

PY - 1997

Y1 - 1997

N2 - This research deals with dynamics of a permanent magnet freely levitated above an excitedhigh-7"c superconductor. Vertical restoring forces acting on the magnet were evaluated by analysis based on fhe critical state and flux flow models. The results shownonlinearity 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 andso on.

AB - This research deals with dynamics of a permanent magnet freely levitated above an excitedhigh-7"c superconductor. Vertical restoring forces acting on the magnet were evaluated by analysis based on fhe critical state and flux flow models. The results shownonlinearity 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 andso on.

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Mechanical stability of a high-Tc superconducting lévitation system

Abstract

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