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US 5,314,868 AGranted
Bearing device
AssigneeKoyo Seiko Co., Ltd.
InventorsRyoichi Takahata, Hirochika Ueyama
Life of this patent
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Abstract
A bearing device for supporting a rotary body relative to a fixed portion in a noncontact state includes a superconducting bearing assembly comprising an annular permanent magnet portion fixedly mounted on the rotary body concentrically therewith and an annular superconductor portion disposed as opposed to the permanent magnet portion. A magnetic bearing assembly is disposed axially away from the superconducting bearing assembly and comprises electromagnets for controlling the position of the rotary body with respect to two radial directions orthogonal to each other.
Claims15
A bearing device comprising:
- a rotary body in the form of a shaft,
- a superconducting bearing assembly for supporting the rotary body in axial and radial directions relative to a fixed portion without contacting the rotary body, the superconducting bearing assembly including an annular permanent magnet portion fixedly mounted on the rotary body concentrically therewith and an annular superconductor portion disposed adjacently facing the permanent magnet portion,
- magnetic bearing means for supporting the rotary body for rotation about an axis of rotation relative to the fixed portion without contacting the rotary body, the magnetic bearing means being positioned axially away from the superconducting bearing assembly and including electromagnets for controlling positioning of the rotary body with respect to two radial directions orthogonal to each other, and
- a control unit for selectively energizing the electromagnets of the magnetic bearing means in response to resonation of the rotary body,
- whereby the electromagnets are driven only when the rotary body resonates.
2 more elements
Dependencies are inferred from the claim text.