抄録
This paper deals with a new magnetic bearing in order to decrease an axial eccentricity. The proposed bearing system consists of moving frames, suspensions, permanent magnets, electromagnets and Zero Power controller. The system enables to avoid axial touchdowns. A clearance between an axis and our proposed bearing may be increased compare to conventional electromagnetic bearings, since permanent magnets are used in new bearings. However, if Zero Power controller is applied to magnetic bearings, a severe problem is emerged. When a levitating axis is subjected to external steady force, to keep equilibrium between external force and magnetic force, a position of levitating axis may be changed. To overcome this difficulty, this paper proposes a new magnetic bearing structure with moving frames and suspensions. The structure enables to decrease an axial eccentricity. The paper shows the experimental results to verify the system.
