Abstract
We have studied a superconducting bearing system using high-Tc superconductors with a strong pinning force. The superconducting bearing system consists of a superconductor prepared by quench and melt growth (QMG) method and a set of alternating-polarity magnets. This paper describes the dynamic characteristics of the superconducting bearing system with small damped vibrations. An impulse force was applied to the set of alternating-polarity magnets levitated over the superconductor of the system. The vibrations of the set of magnets were measured using a laser displacement meter. Stiffness, damping coefficient, and energy loss of the superconducting bearing system were discussed. The results show that the dynamic characteristics of the bearing system are closely related to the static characteristics. It is necessary to evaluate the dynamic characteristics of the superconducting bearing system in applying the system to a radial bearing with a high rotation speed.
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