| 摘要 |
A rotor shaft ( 200 ) for a magnetic bearing device ( 1 ) is disclosed. The shaft comprises an inner portion on whose periphery a plurality of targets ( 240, 260, 280 ) separated by spacers ( 250, 270 ) are mounted. This is achieved exerting an axial pressing force (F, F') to the peripheral parts, rather than applying a radial press fit. In this manner, a simplified construction, a higher stiffness and a higher stability at high rotational speed are achieved. Further disclosed is a rotor having a thrust disk ( 220 ) whose diameter decreases towards the periphery. This allows to use a larger thrust disk at a given rotational speed.
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