Electromagnetic Force between Bulk Superconductors and Permanent Magnets

摘要

The electromagnetic force (EMF) is determined by the interaction between bulk superconductors and permanent magnets. We measured the EMF for Y-Ba-Cu-O superconductors with different shapes and dimensions by varying the structure of disk magnets such as the thickness of magnets and the number of poles. The EMF is strongly dependent on the magnet structure as long as permanent magnets and good quality bulk superconductors are used. Thus for the design of practical devices, it is important to optimize the structure of magnets.