| 摘要 |
PROBLEM TO BE SOLVED: To provide a radial magnetic bearing device causing no disadvantage of fixing or the like due to attracting force of a permanent magnet in assembling, that is, having good workability in manufacture and maintenance. SOLUTION: The position of a contact 91 can be suitably adjusted by adjusting an adjusting nut 94. When the adjusting nut 94 is turned in the loosening direction, the contact 91 is attracted and connected to both electromagnetic pole parts of a stator core 10 to move to an operating position, so that a magnetic circuit passing through the stator core 10 is switched to the short- circuit state where it hardly passes through a rotor core 2 on the surface of a rotating shaft 1. That is, the magnetic circuit having a permanent magnet 20 as magnetomotive force forms a closed loop by the space between both electromagnetic pole parts and the contact 91, whereby attracting force from the stator core 10 is not exerted on the rotating shaft 1.
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