US3702965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 has one primary winding connected to a supplementary winding in selected dynamoelectric machine slots responsive to the generator field synchronous 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
- 👤 Karl F Drexler
- 👤 Henry W Kudlacik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/26; H02K19/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
In a static excitation system for a dynamoelectric machine having a rotating field winding, an electromagnetic stator core and a multiphase set of main armature windings, each main winding having an internal line lead and an internal neutral lead, the combination of: an internal excitation transformer having a core, at least two primary windings and a secondary winding, one of said primary windings being comprised of selected internal leads from said main winding of the dynamoelectric machine, and a supplementary multiphase winding substantially responsive to synchronous flux provided by said dynamoelectric machine rotating field winding, said supplementary winding being connected to the other primary winding of said excitation transformer.
Claim 2
Dependent Claim
109 words
In a static excitation system for a dynamoelectric machine having a rotating field winding, an electromagnetic stator core and a multiphase set of main armature windings, each main winding having an internal line lead and an internal neutral lead, the combination of: an internal excitation transformer having a core, at least two primary windings and a secondary winding, one of said primary windings being comprised of selected internal leads from said main winding of the dynamoelectric machine, and a supplementary multiphase winding substantially responsive to synchronous flux provided by said dynamoelectric machine rotating field winding, said supplementary winding being connected to the other primary winding of said excitation transformer.
Claim 3
Dependent Claim
37 words
The combination according to claim 1, further including stationary rectifier means connected to the secondary winding of said excitation transformer and output leads connected to supply excitation power from the rectifier means to said rotating field winding.
Claim 4
Dependent Claim
40 words
The combination according to claim 1 wherein said supplementary winding is disposed in stator core slots selected to cause the voltage generated in said supplementary winding to be substantially in phase with the virtual voltage produced by said synchronous flux.
Claim 5
Dependent Claim
48 words
The combination according to claim 1 wherein said supplementary winding is disposed in stator core slots selected to cause the voltage generated in said supplementary winding to be shifted in phase so as to lead by a selected phase angle the virtual voltage produced by said synchronous flux.
Claim 6
Dependent Claim
47 words
The combination according to claim 1 wherein said-supplementary winding is disposed in stator core slots selected to cause the voltage generated in said supplementary winding to be shifted in phase so as to lag by a selected phase angle the virtual voltage produced by said synchronous flux.
Claim 7
Dependent Claim
33 words
The combination according to claim 1, further including a reactor winding connected in series with each phase winding of said supplementary winding and the corresponding connected phase winding of said excitation primary winding.
Claim 8
Dependent Claim
50 words
The combination according to claim 1, wherein at least one control winding is provided for said excitation transformer and a regUlated DC voltage source is connected thereto, said control winding being adapted through said voltage source to saturate the excitation transformer and thereby control the output from said secondary winding.
References Cited (Backward Citations)
US2569302A
Cited
US2768344A
Cited
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 |