| 摘要 |
PURPOSE:To improve stability of a magnetic bearing by supporting a cylindrical mass by springs in a cylindrical space disposed on the central part of a fixed body and filling a very small void between the mass and the wall of the space with a liquid of a designated viscosity. CONSTITUTION:A rotor 4 is supported out of contact on a fixed body by magnetic force and rotatably mounted in a casing 1 of a pump. A cylindrical space 17 for installing a resonance preventing mechanism is disposed at the central part of a fixed body 3, and a cylindrical mass 13 concentric with the fixed body 3 is supported by springs 14 with a very small void 15 between the peripheral surface of the mass 13 and the side of the space of the fixed body 3 in the space. In order to fill the void 5 with a liquid of a comparatively high viscosity, the space 17 is filled with a viscous liquid such as lubricating oil, grease or the like. Therefore, stability of a magnetic bearing for vibration caused by external force near the natural frequency of the fixed body can be increased to attain favorable operation.
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