US5107192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearing control at critical shaft speeds
Assignee: Sundstrand Corp
•
Filing: 1990-12-26
•
Granted: 1992-04-21
•
Expires: 2010-12-26
Abstract
Abstract In a magnetic bearing system, the longitudinal shaft position is shifted relative to the bearing position so that a force can be applied by the bearings away from a node at critical shaft speeds. In one embodiment, the shaft is shifted by end thrust bearings back and forth on an integral cycle basis. Alternatively, closely-spaced bearing pairs may be used and energized alternately on an integral cycle basis in order to shift back-and-forth the region at which the combined effective force of the bearing is applied.
Inventors
- 👤 Maurice A. Kirchberg, Jr.
- 👤 Alexander Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:10
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0444; F16F; F16F15/00; F16F15/02; H; H02; H02K; H02K7/00; H02K7/08; H02K7/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A system for controlling oscillation of a shaft in a magnetic bearing which applies a force on said shaft at a pre-determined location along said shaft, comprising in combination: means for energizing said bearing; means for controlling said energizing means to generate a force in said bearing to oppose oscillation of said shaft; means for determining a shaft rotational speed at which a node of said oscillation occurs at said pre-determined location; and means responsive to said determining means to move said shaft in a longitudinal direction relatively to the location of applied bearing force at a rotational speed at which a node occurs at said pre-determined location.
Claim 2
Independent Claim
108 words
A system for controlling oscillation of a shaft in a magnetic bearing which applies a force on said shaft at a pre-determined location along said shaft, comprising in combination: means for energizing said bearing; means for controlling said energizing means to generate a force in said bearing to oppose oscillation of said shaft; means for determining a shaft rotational speed at which a node of said oscillation occurs at said pre-determined location; and means responsive to said determining means to move said shaft in a longitudinal direction relatively to the location of applied bearing force at a rotational speed at which a node occurs at said pre-determined location.
Claim 3
Dependent Claim
30 words
A system for controlling oscillation of a shaft in a magnetic bearing as in claim 1 wherein responsive means moves said shaft back and forth relative to said pre-determined location.
Claim 4
Dependent Claim
25 words
A system for controlling oscillation of a shaft in a magnetic bearing as in claim 1 wherein said shaft moves and said bearing is stationary.
Claim 5
Dependent Claim
29 words
A system for controlling oscillation of a shaft in a magnetic bearing as in claim 1 wherein the location of applied bearing force moves and said shaft is stationary.
Claim 6
Dependent Claim
25 words
A system for controlling oscillation of a shaft in a magnetic bearing as in claim 2 wherein said shaft moves and said bearing is stationary.
Claim 7
Dependent Claim
29 words
A system for controlling oscillation of a shaft in a magnetic bearing as in claim 3 wherein the location of applied bearing force moves and said shaft is stationary.
References Cited (Backward Citations)
US2399329A
Cited
US4219767A
Cited
US4473259A
Cited
US4446412A
Cited
US4421207A
Cited
US5012170A
Cited
US4950966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |