バルクマグネットを用いた超伝導磁気ベアリングの浮上力特性

概要

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Type II superconductors can be trapped fluxes at pinning centers. The fluxes-trapping superconductor behaves like a permanent magnet, which is called a "bulk magnet". It is reported that its magnetic field is stronger than that of a usual permanent magnet. We propose a novel levitation system using two sets of superconductors, one of which used the bulk magnets. In this paper, we compared the levitation forces of a usual levitation system with a permanent magnet and the novel levitation system with a bulk magnet. The average magnetic field of the permanent magnet was the same one of the bulk magnet, however, the average magnetic gradient of the permanent magnet was smaller than the average magnetic gradient of the bulk magnet. As the experimental results, maximum levitation forces were same. This result may be ascribed to inhomogeneity of the critical current density (J_c) distribution in the superconductors used. This novel levitation system is expected to provide a stronger levitation force, using a bulk magnet with stronger magnetic field.
湘南工科大学の論文
1999-03-25