| 摘要 |
A bearing apparatus includes a rotator body, a non-rotation body rotatably supporting the rotator body, and a lubrication fluid provided between the rotator body and the non-rotation body in which the rotator body is supported in a thrust direction by a thrust dynamic pressure bearing formed between the rotator body and the non-rotation body. The bearing apparatus includes an active magnetic bearing formed by a driving coil disposed on one of the rotator body and the non-rotation body and a magnet disposed on the other thereof, and a gap sensor that detects an axial direction gap between the rotator body and the non-rotation body. The thrust dynamic pressure bearing and the active magnetic bearing are combined such that the static rigidity of the bearing apparatus is born by the active magnetic bearing and the dynamic rigidity is born by the dynamic pressure bearing.
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