| 摘要 |
PURPOSE:To obtain strong damping forces to match a rotor body by permitting a permanent magnet to move freely in the horizontal direction and to be held centripetally, under the condition that a minute liquid film is provided for the magnet. CONSTITUTION:A permanent magnet 13 is held by a support member 14 capable of making centripetal action, such as a spring or the like. The permanent magnet 13, magnetized in polarity, restricts the position of a permanent magnet 2 in the radial direction, i.e. the position of the top end of a rotor body 1 in the radial direction, due to magnetic repulsion caused against a permanent magnet 2. Further, the support member 14 forms a minute liquid film in the horizontal direction, which produces a shear effect between the bottom face of the permanent magnet 13 and the inside bottom wall of a liquid bath 11. Therefore, said magnet is held in such that a minute clearance 15 may exist to make it possible to obtain strong damping forces to match the rotor body 1. |
