Design of the Magnetic Circuit to Improve Stability of the Magnetic Bearing Using HTS

This paper proposes the design of the magnetic circuit to improve stability of the magnetic bearing using HTS. From the rotational characteristic, it is shown that if the flux of the rotor is concentrated to the outer part of the HTS, the rotor will be able to rotate stability. In order to achieve stable rotation, the yoke equipped ring type rotor is proposed. The ring type permanent magnet equipped the yoke is used of this rotor. The change in the flux when the gap between the yoke and the permanent magnet, the yoke thickness and the width are changed is considered. As each value increases, the flux amount increases. As the gap between the yoke and the permanent magnet increases, the flux distribution is more concentrated to the outer part of the HTS. Considering the overall diameter, the boundary where the increasing rate decreases is adopted as the optimum value. In the yoke thickness and the width, the minimum value where the magnetic saturation is not observed is adopted as the optimum value. As a result, the magnetic circuit that the flux is concentrated to the outer part of the HTS is designed. By concentrating the flux to the outer part of the HTS, the stable rotation is given.