Patent US4900959A successfully refreshed from Google Patents.
US4900959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated outer rotor for brushless exciter
Assignee: Westinghouse Electric Corp
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Filing: 1989-01-06
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Granted: 1990-02-13
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Expires: 2009-01-06
Abstract
Abstract In a generator exciter composed of a stator (12) for producing a dc field and a rotor (16, 18) mounted to rotate relative to the stator (12) and including armature windings (18) connected to generate ac output currents, the rotor (16, 18) is mounted radially outwardly of the stator (12), and is insulated from its support.
Inventors
- 👤 Samuel A. Drinkut
- 👤 James R. Pipkin
- 👤 Lon W. Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:01
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
In a generator exciter comprising a stator for producing a dc field and a rotor mounted to rotate relative to the stator and including armature windings connected to generate ac output currents, said rotor comprising a high strength retaining cylinder located radially outwardly of, and supporting, said armature windings, and an insulating material being interposed between said retaining cylinder and said armature windings, wherein said rotor is mounted radially outwardly of said stator.
Claim 2
Dependent Claim
73 words
In a generator exciter comprising a stator for producing a dc field and a rotor mounted to rotate relative to the stator and including armature windings connected to generate ac output currents, said rotor comprising a high strength retaining cylinder located radially outwardly of, and supporting, said armature windings, and an insulating material being interposed between said retaining cylinder and said armature windings, wherein said rotor is mounted radially outwardly of said stator.
Claim 3
Dependent Claim
18 words
An exciter as defined in claim 1 wherein said rotor is supported via only one axial end thereof.
Claim 4
Dependent Claim
43 words
An exciter as defined in claim 1 wherein said rotor further comprises a support ring disposed at one end of said rotor and having a radial outer portion supporting said retaining cylinder and a radial inner portion for mounting on a generator shaft.
Claim 5
Dependent Claim
43 words
An exciter as defined in claim 1 wherein said rotor further comprises electronic means supported by said retaining cylinder via said insulating sleeve and connected to said armature windings for converting the output currents produced by said armature windings into a direct current.
Claim 6
Dependent Claim
31 words
An exciter as defined in claim 1 wherein said stator and said rotor are provided with radial ventilation passages for the flow of cooling air driven by rotation of said rotor.
Claim 7
Dependent Claim
31 words
An exciter as defined in claim 5 wherein said armature windings include winding end turns which are supported by said retaining cylinder and are exposed to the flow of cooling air.
Claim 8
Dependent Claim
18 words
An exciter as defined in claim 5 wherein said rotor is supported via only one axial end thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |