| 摘要 |
PURPOSE:To aim at a distinct improvement in the strength of a bearing, by making up at least a portion to be given magnetic force in a floating body of a rotor or the like into a hollow cylindrical form solidly with a high magnetic permeability material, while installing such a control element as capable of feeding the magnetic force in the hollow part. CONSTITUTION:As a floating body being supported by dint of magnetic force in a noncontact manner, a magnetic bearing 1 is provided with a hollow cylinder 2 made of a high magnetic permeability material, while its movements in both radial and axial directions are regulated by each of magnetic poles 3a, 3b and 4. Each magnetic pole is magnetized to a stator yoke 5 inside the cylinder 2, while the magnetic force to support this cylinder 2 is fed from permanent magnets 13a and 13b magnetized by the yoke 5. This floating body 1 is set up inside a case 11 in which an induction motor stator 12a generating a revolving magnetic field is installed in the case 11. A high electric conductive material 12b, for example, copper or the like is applied to a surface of the floating body 1 opposed to the stator 12a by means of electroplating treatment, etc., thus inductive turning force is given to the floating body 1. |
