2016 年 82 巻 839 号 p. 16-00002
In this study, we proposed a hybrid stator comprising a superconductor and a ring-shaped permanent magnet and measured the levitation characteristics of a magnet levitating above various hybrid stators. The magnetic field of the hybrid stator was equal to the composite magnetic field of the superconductor and the ring magnet. By adding a ring magnet, the vertical magnetic attractive force and stiffness were increased compared with those of a simple superconducting stator. Analysis of the calculated magnetic field for the ring magnet determined that the attractive force of the ring magnet and superconducting pinning force were effectively combined on the proposed hybrid stator. Although the maximum potential energy of stable levitation increased threefold, the horizontal magnetic stiffness of the hybrid stator was half of that of the simple superconducting stator at the initial pinning position. The proposed hybrid stator exhibits better levitation characteristics than a simple superconducting one. An improvement in the stability of the levitating magnet is realized by the hybrid stator using a superconductor and a ring-shaped magnet.
