Hybrid High Tc Superconducting Magnetic Bearing (SMB) System With no Bias Currents

In this paper, a hybrid-type superconducting magnetic bearing (SMB) system with no-bias currents is discussed. The hybrid-type SMB system consists of passive-type SMB's, active-type magnetic bearings (AMB's), a rotor, and sensors. And the rotor position is controlled by a controller with no-bias currents. Because the controller doesn't need bias currents applied to the electromagnets, the energy losses are considered to be less than other magnetic bearing systems. The displacements of the rotor are suppressed by both the SMB's and the AMB's. The superconductors of the SMB's were field-cooled. Compliance for the bearings, displacements of the rotating rotor, and energy losses for the system were investigated. The results show that the hybrid-type SMB system with no-bias currents has good performances in these evaluations.