酸化物超電導体と永久磁石間の浮上力の解析

概要

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Passive superconducting bearings differ from active magnetic bearings in that they use bulk superconductors to levitate a body stably without using complex control systems and without expenditure of external power. A magnet-superconductor pair, consisting of a permanent magnet and a high-temperature superconductor, separated by a magnetic gap forms a typical stable bearing. The following cases are considered for the magnet-superconductor pair. Case 1 : The magnet-superconductor pair is constructed after the superconductor-material being cooled below the critical temperature. Case 2 : At first, a pair of magnet and superconductor-material is constructed, then the superconductor-material being cooled below the critical temperature and the magnet-superconductor pair is constructed. In this paper, for the above cases, levitation forces between a permanent magnet and a superconductor with the variation of the magnetic gap within its operational range for bearings are measured. Then the levitation forces are calculated using author's numerical method and it is shown that the experimental and calculated results are in good agreement. There fore the levitation force between the magnet and the superconductor of a superconducting bearing is predicted with a fair degree of accuracy by the numerical method.
日本シミュレーション学会の論文
1994-09-15