US5300843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault tolerant active magnetic bearing
Assignee: General Electric Co
•
Filing: 1992-11-02
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Granted: 1994-04-05
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Expires: 2012-11-02
Abstract
Abstract A fault tolerant active magnetic bearing has at least three magnetically isolated control axes. To this end, the active magnetic bearing has a segmented stator which employs non-magnetic sections for magnetically isolating adjacent electromagnetic force actuators, and hence adjacent control axes. As a result, operating force actuators are not affected by magnetic poles experiencing a fault. Hence, in a three-phase active magnetic bearing rotor suspension control system, for example, full control of rotor shaft position can be maintained with only two functioning control axes.
Inventors
- 👤 James P. Lyons
- 👤 Mark A. Preston
- 👤 Gerald B. Kliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:30
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0442; F16C32/0474; F16C32/048; F16C32/0482
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
An active magnetic bearing, comprising: a rotor mounted for rotation within a stator and for coupling to a shaft, said stator having at least six adjacent electromagnets configured such that each electromagnet is situated opposite from a corresponding electromagnet, adjacent electromagnets being separated by non-magnetic flux barriers, opposite electromagnets functioning as a magnetically isolated control axis, such that there are at least three magnetically isolated control axes, and only two of said control axes are required to be operational in order to maintain operation of said magnetic bearing.
Claim 2
Dependent Claim
88 words
An active magnetic bearing, comprising: a rotor mounted for rotation within a stator and for coupling to a shaft, said stator having at least six adjacent electromagnets configured such that each electromagnet is situated opposite from a corresponding electromagnet, adjacent electromagnets being separated by non-magnetic flux barriers, opposite electromagnets functioning as a magnetically isolated control axis, such that there are at least three magnetically isolated control axes, and only two of said control axes are required to be operational in order to maintain operation of said magnetic bearing.
Claim 3
Dependent Claim
14 words
The active magnetic bearing of claim 1 wherein said stator has three control axes.
Claim 4
Dependent Claim
15 words
The active magnetic bearing of claim 1 wherein said electromagnets each comprise a stator pole-pair.
Claim 5
Dependent Claim
17 words
The active magnetic bearing of claim 1 wherein said stator comprises a stack of composite stator laminations.
Claim 6
Dependent Claim
26 words
The active magnetic bearing of claim 1 wherein said stator comprises a stack of laminations, said flux barriers comprising solid non-magnetic segments bonded to said laminations.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |