高温超電導体の着磁技術の基礎研究

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It is known that permanent magnets produce magnetic fields up to 1T. On the other hand, magnetized high temperature superconductors can be used as "super"-permanent magnets which produce magnetic fields higher than 1T, because superconductors can trap higher magnetic fluxes than usual permanent magnets. In order to magnetize a YBCO bulk superconductor, there are two ways; a field cooling (FC) method and a zero field cooling (ZFC) method. FC is the way of magnetizing the superconductor by applying an external magnetic field before cooling the superconductor and ZFC is the way of magnetizing the superconductor after cooling it. The strength of trapped magnetic fields depends on the critical current density and the radius of a bulk superconductors. The Bean-London model describes well the magnetization process. Permanent magnets which are used in an electrical machine are sometimes embedded deep in it. However, a method of FC or ZFC is not always easy if high temperature superconductors are embedded in equipment. There is a way of magnetization to use high magnetic field generated by a large pulsed electric current. Using this way, the size of magnetization coil can be reduced. We consider that the pulsed field (PF) magnetization is the most suitable way for magnetization under such circumstances. Hence, we introduce a large current pulsed power source. We study the characteristics of magnetization by pulsed electric current. In this paper, characteristics of magnetization of high temperature superconductors are reported.
湘南工科大学の論文
1999-03-25

高温超電導体の着磁技術の基礎研究

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