| 摘要 |
An elongated rotor 16 supported by a thrust bearing at its bottom end, is supported at the top end by coaxial tubular magnets 11 and 15. The magnet 15 is of shorter axial length and is mounted on the rotor. The inner magnet 11, poled in the same direction, is adhered or bonded to a magnet holder 12 mounted for damped radial movement by means of resilient rods 13 attached to the rotor housing. Axial relative movement of the magnets resulting from transverse forces acting on the rotor when rotating causes changes in radial stiffness and in axial forces due in each case to the magnetic interaction. The axial force can be tensile when the rotor is stationary and progressively change to a pressure against the thrust bearing as the rotor runs up to speed. Composite magnet construction, special shapes and forms of magnetization and magnetic screening can be used to control the magnetic interactions. <IMAGE> |
