Whirl inhibiting coast-down bearing for magnetic bearing systems
First Claim
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1. An apparatus for supporting a shaft during coast-down, the apparatus comprising:
- a plurality of eccentric rings disposed around the shaft and radially-spaced therefrom to provide a running clearance between the shaft and the plurality of eccentric rings, whereinat least two of the plurality of eccentric rings each have a center vertically offset above a nominal center of the apparatus, such that the at least two of the plurality of eccentric rings provide a pocket to receive the shaft during the coast-down, andat least one of the plurality of eccentric rings is received in a groove defined in a housing, the housing receiving the shaft and the housing supporting the apparatus.
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Abstract
A coast-down bearing and method for a magnetic bearing system is provided. The bearing includes first, second, and third rings disposed around a shaft. The first, second, and third rings each have an inner diameter that is greater than an outer diameter of the shaft and provide a running clearance therebetween. The first, second, and third rings are eccentrically positioned with respect to each other to form a pocket for receiving the shaft during a drop, radial shock, or both.
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Citations
16 Claims
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1. An apparatus for supporting a shaft during coast-down, the apparatus comprising:
a plurality of eccentric rings disposed around the shaft and radially-spaced therefrom to provide a running clearance between the shaft and the plurality of eccentric rings, wherein at least two of the plurality of eccentric rings each have a center vertically offset above a nominal center of the apparatus, such that the at least two of the plurality of eccentric rings provide a pocket to receive the shaft during the coast-down, and at least one of the plurality of eccentric rings is received in a groove defined in a housing, the housing receiving the shaft and the housing supporting the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A coast-down bearing for a magnetic bearing system, the coast-down bearing comprising:
first, second, and third rings disposed around a shaft, wherein each of the first, second, and third rings has an inner diameter that is greater than an outer diameter of the shaft and a running clearance is defined between each of the first, second, and third rings and the shaft, the first, second, and third rings are eccentrically positioned with respect to each other to form a pocket for receiving the shaft during a drop, radial shock, or both, and each of the first, second, and third rings is received in a respective annular groove defined in a housing, the housing receiving the shaft and the housing supporting the coast-down bearing. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
Specification