Bearing apparatus
First Claim
1. A bearing apparatus comprising:
- a thrust dynamic pressure bearing and an active magnetic bearing provided in combination wherein the active magnetic bearing bears a static rigidity and the thrust dynamic pressure bearing bears a dynamic rigidity.
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Accused Products
Abstract
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.
20 Citations
20 Claims
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1. A bearing apparatus comprising:
a thrust dynamic pressure bearing and an active magnetic bearing provided in combination wherein the active magnetic bearing bears a static rigidity and the thrust dynamic pressure bearing bears a dynamic rigidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A bearing apparatus including a rotator body and a non-rotation body rotatably supporting the rotator body, and a lubrication fluid present 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 comprising:
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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 of the rotator body and the non-rotation body; and
a gap sensor that detects a gap in an axial direction between the rotator body and the non-rotation body, wherein the gap in the axial direction is controlled by controlling current applied to the driving coil based on an output of the gap sensor. - View Dependent Claims (10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
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15. A bearing apparatus including a rotator body and a non-rotation body rotatably supporting the rotator body, and a lubrication fluid present 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 generated between the rotator body and the rotating body, the bearing apparatus comprising:
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an active magnetic bearing formed by a driving coil disposed on one of the rotator body and the non-rotation body and a magnetic material disposed on the other of the rotator body and the non-rotation body; and
a gap sensor that detects an axial direction gap between the rotator body and the non-rotation body, wherein the axial direction gap is controlled by controlling current applied to the driving coil based on an output of the gap sensor.
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Specification