Patent US3336776A successfully refreshed from Google Patents.
US3702964A
Expired / Lapsed
US
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Internal static excitation system for a dynamoelectric machine
Assignee: General Electric Co
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Filing: 1971-06-22
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Granted: 1972-11-14
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Expires: 1991-06-22
Abstract
Abstract A static excitation system is provided for self-excitation of a large generator with gas and/or liquid cooling systems which is located inside or closely coupled to the generator casing so as to utilize the generator coolant system. The static excitation transformer preferably has one primary winding connected to a supplementary winding in the dynamoelectric machine slots responsive to the generator field flux and another primary winding comprised of the neutral leads of the generator main winding responsive to generator current. The secondary of the internal excitation transformer thus provides a compound voltage source, responsive to both generator field flux and generator current which is then rectified and applied through suitable controls to the generator field.
Inventors
- 👤 Henry W Kudlacik
- 👤 David M Willyoung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:48
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/38; H02K; H02K19/00; H02K19/16; H02K19/26; H02K19/28; H02K9/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
In a dynamoelectric machine having a rotating field winding, an electromagnetic stator core and a multiphase set of main armature windings, each phase of said main winding having two internal leads, said dynamoelectric machine further having a closed casing and a cooling system arranged to recirculate coolant fLuids over said windings and core, the combination of: an excitation transformer disposed closely adjacent the dynamoelectric machine core and adapted to be cooled by the dynamoelectric machine cooling system, said transformer having a core, at least two primary windings and a secondary winding which are disposed in heat exchange relationship with said dynamoelectric machine coolant fluids, one of said primary windings consisting of selected internal leads from said main winding of the dynamoelectric machine, and a supplementary power source connected to the other primary winding of said excitation transformer.
Claim 2
Dependent Claim
137 words
In a dynamoelectric machine having a rotating field winding, an electromagnetic stator core and a multiphase set of main armature windings, each phase of said main winding having two internal leads, said dynamoelectric machine further having a closed casing and a cooling system arranged to recirculate coolant fLuids over said windings and core, the combination of: an excitation transformer disposed closely adjacent the dynamoelectric machine core and adapted to be cooled by the dynamoelectric machine cooling system, said transformer having a core, at least two primary windings and a secondary winding which are disposed in heat exchange relationship with said dynamoelectric machine coolant fluids, one of said primary windings consisting of selected internal leads from said main winding of the dynamoelectric machine, and a supplementary power source connected to the other primary winding of said excitation transformer.
Claim 3
Dependent Claim
32 words
The combination according to claim 1, further including rectifier means connected to the secondary winding of said excitation transformer and output leads connected to supply excitation power to said rotating field winding.
Claim 4
Dependent Claim
30 words
The combination according to claim 1 wherein said supplementary power source is a supplementary multiphase winding disposed to link with the synchronous flux provided by said dynamoelectric machine rotor winding.
Claim 5
Dependent Claim
24 words
The combination according to claim 3, wherein said supplementary winding comprises a set of liquid-cooled conductors disposed in slots of the dynamoelectric machine core.
Claim 6
Dependent Claim
29 words
The combination according to claim 1 wherein said supplementary power source is a supplementary multiphase transformer connected so as to draw power from the dynamoelectric machine main armature windings.
Claim 7
Dependent Claim
46 words
The combination according to claim 1, wherein said selected leads comprise the neutral leads of a wye-connected main winding and wherein said leads are connected together inside the dynamoelectric machine casing along with said excitation transformer so as to comprise a completely internal static excitation system.
Claim 8
Dependent Claim
41 words
The combination according to claim 1, wherein said selected leads comprise the neutral leads, and wherein said neutral leads pass through said excitation transformer and leave the dynamoelectric machine casing through bushings to be connected together in an external neutral connection.
Claim 9
Dependent Claim
19 words
The combination according to claim 1, wherein said selected leads comprise the internal line leads of said main windings.
Claim 10
Dependent Claim
32 words
The combination according to claim 1, wherein at least one portion of said excitation transformer is directly cooled by a fluid coolant which also serves to cool the dynamoelectric machine main windings.
Claim 11
Dependent Claim
32 words
The combination according to claim 9, wherein said coolant is liquid pumped by said dynamoelectric machine cooling system through both the main winding and at least one of said excitation transformer windings.
Claim 12
Dependent Claim
31 words
The combination according to claim 1, wherein at least one portion of said excitation transformer is cooled by fluid coolant which also serves to cool the core of the dynamoelectric machine.
Claim 13
Dependent Claim
31 words
The combination according to claim 11, wherein said coolant is gas circulated by said dynamoelectric machine cooling system over both the dynamoelectric machine core and the core of said excitation transformer.
Claim 14
Dependent Claim
26 words
The combination according to claim 1, wherein said excitation transformer is disposed in a dome attached to said dynamoelectric machine casing and opening into said casing.
Claim 15
Dependent Claim
42 words
The combination according to claim 1, wherein said excitation transformer is disposed in a first enclosure, said dynamoelectric machine casing comprises a second enclosure, and further including conduit means connecting said enclosures and having means to conduct fluid coolant between said enclosures.
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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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |