| 摘要 |
PROBLEM TO BE SOLVED: To suppress a chattering vibration in processing, for example, by improving the damping performance of a bearing extensively, in a magnetic bearing spindle used for a production processing machine and the like. SOLUTION: The rotator of a radial magnetic bearing is composed of an electromagnetic steel plate with the thickness Tr, and the conductivityσr, while the stator has an electrode part for damper with the width Td at the part facing the rotator in the axial direction, and the conductivityσd, and by makingσd×Td2>σr×Tr2, the magnetic bearing can get a large bearing damping performance.
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