Spin motion of a levitated magnet caused by vertical excitation of a high-Tc superconductor

Toshihiko Sugiura, Shuuichi Hayakawa, Tsuyoshi Tanaka, Masatsugu Yoshizawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


This research deals with nonlinear dynamics of a permanent magnet freely levitated above a high-Tc superconductor excited in the vertical direction, focusing on generation of spin torque acting on the magnet. Equations of 6 d.o.f. motion, nonlinearly coupled by magnetic force and torque, were described on the assumption that a magnet has an eccentricity between the center of gravity and the magnetic center. Force and torque were evaluated analytically by the flux frozen method. Dynamic behavior of the magnet was examined numerically for different frequencies of excitation. A simplified 2 d.o.f. system with only essential terms was introduced in order to discuss the mechanism of nonlinear coupling which generates spinning from vertical oscillation. Spinning motion of the magnet was examined in detail analytically by the method of harmonic balance. Experiments of vertical excitation were also carried out. Experimental results were compared with numerical ones.

Original languageEnglish
Title of host publicationDesign Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages9
ISBN (Print)0791836282, 9780791836286
Publication statusPublished - 2002 Jan 1

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings

ASJC Scopus subject areas

  • Mechanical Engineering


Dive into the research topics of 'Spin motion of a levitated magnet caused by vertical excitation of a high-Tc superconductor'. Together they form a unique fingerprint.

Cite this