Static and Dynamic Characteristics of Superconducting Magnetic Bearings Using Mpmg Ybacuo

The results of static and dynamic characteristics of a large circular superconducting magnetic bearing using MPMG-YBaCuO are presented. In the static experiments, the attractive force performed more effectively in both axial and radial directions than the repulsive force exerted by the pinning effect. The levitation performance in thrust and radial bearing were analyzed qualitatively by magnetic field distribution model. In run tests, a shaft of 2.4 kg weight rotated safely up to 33000 rpm. At speeds higher than 25 000 rpm, the amplitude of the shaft vibration was almost constant, 120 µ peak to peak, in long-period whirling motion compared with rotational speed.