US3758842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field excitation circuit for a dynamoelectric machine
Assignee: General Electric Co
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Filing: 1972-05-30
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Granted: 1973-09-11
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Expires: 1992-05-30
Abstract
Abstract A field excitation circuit utilizing a three-winding excitation transformer in each phase to supply the excitation power of a dynamoelectric machine. The field excitation circuit includes a variable reactance in series with one winding of each threewinding excitation transformer. The variable reactance comprises a reactor with silicon-controlled rectifiers connected in an inverse parallel relationship. The power output of the excitation system is adjusted to the required value by varying the reactance.
Inventors
- 👤 H Kudlacik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:21
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A field excitation circuit for a dynamoelectric machine having a field winding, said field excitation circuit comprising; a transformer having a first winding, a second winding, and a third winding, said first, second, and third winding being coupled to one another, said first winding being responsive to armature current provided by said dynamoelectric machine, said second winding being responsive to synchronous flux provided by said dynamoelectric machine, and said third winding developing a voltage responsive to said first and second winding; means for rectifying said voltage from said third winding to provide a direct current output; means for connecting said direct current output of said rectifying means to said field winding; and means for providing a variable reactance in series with said second winding for controlling the amount of current through said second winding.
Claim 2
Dependent Claim
134 words
A field excitation circuit for a dynamoelectric machine having a field winding, said field excitation circuit comprising; a transformer having a first winding, a second winding, and a third winding, said first, second, and third winding being coupled to one another, said first winding being responsive to armature current provided by said dynamoelectric machine, said second winding being responsive to synchronous flux provided by said dynamoelectric machine, and said third winding developing a voltage responsive to said first and second winding; means for rectifying said voltage from said third winding to provide a direct current output; means for connecting said direct current output of said rectifying means to said field winding; and means for providing a variable reactance in series with said second winding for controlling the amount of current through said second winding.
Claim 3
Dependent Claim
22 words
The circuit as in claim 1, wherein said variable reactance means comprises inverse parallel silicon-controlled rectifiers connected in parallel with a reactor.
Claim 4
Dependent Claim
16 words
The circuit as in claim 1 wherein said variable reactance means comprises inverse parallel silicon-controlled rectifiers.
Claim 5
Dependent Claim
40 words
The circuit as in claim 1, wherein said first, said second, and said third winding form one phase set of a multiphase set of windings, and a reactance means is connected in series with each phase of said second winding.
Claim 6
Dependent Claim
178 words
A field excitation circuit for a dynamoelectric machine having a field winding and an electromagnetic stator core, said electromagnetic stator core including a multiphase main armature winding having a neutral lead, and a multiphase supplementary winding having an output, said field excitation circuit comprising the combination of: a multiphase transformer having a first multiphase winding, a second multiphase winding, and a third multiphase winding, said first, second, and third multiphase winding being coupled to one another, said first multiphase winding being responsive to armature current in said multiphase main armature winding, said second multiphase winding being responsive to synchronous flux provided by said multiphase supplementary winding, and said third multiphase winding developing a voltage substantially responsive to said first and said second mutliphase winding; means for rectifying said voltage from said third multiphase winding, to provide a direct current output; means for connecting said direct current output of said rectifying means to said field winding; and means for providing a variable reactance in series with each phase of said second winding for controlling the amount of current therethrough.
Claim 7
Dependent Claim
178 words
A field excitation circuit for a dynamoelectric machine having a field winding and an electromagnetic stator core, said electromagnetic stator core including a multiphase main armature winding having a neutral lead, and a multiphase supplementary winding having an output, said field excitation circuit comprising the combination of: a multiphase transformer having a first multiphase winding, a second multiphase winding, and a third multiphase winding, said first, second, and third multiphase winding being coupled to one another, said first multiphase winding being responsive to armature current in said multiphase main armature winding, said second multiphase winding being responsive to synchronous flux provided by said multiphase supplementary winding, and said third multiphase winding developing a voltage substantially responsive to said first and said second mutliphase winding; means for rectifying said voltage from said third multiphase winding, to provide a direct current output; means for connecting said direct current output of said rectifying means to said field winding; and means for providing a variable reactance in series with each phase of said second winding for controlling the amount of current therethrough.
Claim 8
Dependent Claim
22 words
The combination as in claim 5, wherein said variable reactance means comprises inverse parallel silicon-controlled rectifiers connected in parallel with a reactor.
Claim 9
Dependent Claim
16 words
The cOmbination as in claim 5, wherein said variable reactance means comprises inverse parallel silicon-controlled rectifiers.
Claim 10
Dependent Claim
20 words
The combination as in claim 5, wherein said first multiphase winding comprises said neutral leads of said main armature winding.
Claim 11
Dependent Claim
23 words
The combination as in claim 5, wherein said second multiphase winding is connected in series with said output of said multiphase supplementary winding.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |