Basic Study On Four Types of Superconducting Magnetic Bearings (SMBs) Using High T c Superconductor Bulks and Superconducting Coils

Superconducting magnetic bearings (SMBs) are usually composed of superconductors and permanent magnets (PMs). These SMBs are based on pinning forces between superconductors and PMs. In this paper, SMB-I composed of disk-shaped superconductor and SMB-II composed of doughnut-shaped superconductor are studied. To compare SMB-I with SMB-II, impulse responses in the vertical and horizontal directions are performed. Moreover, new types of SMB-III and SMB-IV are proposed. These SMB-III and SMB-IV are composed of superconductor and superconducting coils. To compare SMB-III with SMB-IV, impulse responses in the vertical and horizontal directions are studied. Then, natural damped vibration curves for impulse responses are observed. The damping coefficient for SMB-IV is larger than other SMB-I, SMB-II and SMB-III.