Rotor Shaft for a Magnetic Bearing Device
AssigneeMecos Traxler AG
InventorsPhilipp Buhler, Rene Larsonneur
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Abstract
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.
Claims13
A rotor shaft for a magnetic bearing device, said rotor shaft comprising a inner shaft portion and at least one substantially annular target for an electromagnet, said target being disposed on a periphery of said inner shaft portion said target is being held between two collars exerting an axial pressing force on said tar-get in a manner such that said axial pressing force is strongest near an outer periphery of said rotor shaft.
A method for manufacturing a rotor shaft comprising the steps of
- providing an inner shaft portion having a substantially cylindrical portion, a collar disposed on one axial side of said cylindrical portion and a male thread disposed on another axial side of said cylindrical portion;
- providing a plurality of stacked annular sheets for forming a target;
- providing a nut having a female thread;
- sliding said plurality of stacked annular sheets onto said substantially cylindrical portion of said inner shaft portion to form said target;
- and
- fastening said nut with said female thread onto said male thread for exerting an axial pressing force onto said target in a manner that said axial pressing force is largest near an outer periphery of said rotor shaft.
Dependencies are inferred from the claim text.