Analysis of magnetic forces and rotational losses of high-Tc superconducting magnetic bearings by Preisach's diagram

A flywheel system using a high-Tc superconducting bearing is researched to apply for a power storage system. The authors analyzed the magnetization of the high-Tc superconducting bulk using Preisach's diagrams. They calculated the magnetic forces and rotational losses of radial type high-Tc superconducting bearings by the electromagnetic simulation using the magnetization. In this paper, the authors calculate the magnetic force and loss of the bearing regarding the parameters of the bearing size and the characteristics of the permanent magnet. It was found that the magnetic force is affected due to the size and the characteristics of the permanent magnet. This calculation method is considered to be satisfactory for application to large scale bearings.