ラジアル型超電導磁気軸受における浮上力および遮蔽電流密度と軸方向電磁力密度分布の数値解析

抄録

The flywheel energy storage systems using superconducting magnetic bearings (SMBs) have been studied to contribute to daily load leveling. These SMBs are incorporated to support the total weight of rotors without contacting them. In designing these SMBs, the levitation force should be reasonably predicted. To predict this force, the practical analytical method should be developed. This paper deals with the analysis of levitation force characteristics for practicable radial-type SMBs with multiple superconducting bulks. It was found that the attenuation of the levitation force because of flux creep and hysteresis of a superconductor assembly were well explained. We show calculation results of the distribution of supercurrent density and axial magnetic force density according to flux creep and hysteresis of the superconductor in radial-type SMB. The ‘ideal bulk with a model of equivalent thickness’ would be effectively applied to the design of an actual SMB.