Patent US4128779A successfully refreshed from Google Patents.
US4128779A
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US
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Stranded conductor for dynamoelectric machines
Assignee: Westinghouse Electric Corp
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Filing: 1977-04-05
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Granted: 1978-12-05
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Expires: 1997-04-05
Abstract
Abstract A winding conductor is provided for large dynamoelectric machines, such as turbine generators, consisting of two parallel bars each comprising two stacks of strands transposed between the stacks. The radial flux in the machine causes circulating currents with unequal distribution of current between the two parallel bars of such a conductor, causing excessive heating in one of the bars. The two bars of each conductor are, therefore, made of different cross-sectional areas substantially proportional to the different currents, so that in normal operation, the current density is the same in both bars and overheating is prevented.
Inventors
- 👤 Sheppard J. Salon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:47
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/12; H02K3/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A winding conductor for a dynamoelectric machine, said conductor comprising two bars disposed physically and electrically in parallel, each of said bars consisting of a plurality of insulated strands disposed in two side-by-side stacks and transposed between stacks, said bars being subject to unequal division of current between them during operation of the machine, and the cross-sectional areas of the two bars being different such that the current density is substantially the same in both bars.
Claim 2
Dependent Claim
76 words
A winding conductor for a dynamoelectric machine, said conductor comprising two bars disposed physically and electrically in parallel, each of said bars consisting of a plurality of insulated strands disposed in two side-by-side stacks and transposed between stacks, said bars being subject to unequal division of current between them during operation of the machine, and the cross-sectional areas of the two bars being different such that the current density is substantially the same in both bars.
Claim 3
Dependent Claim
29 words
A winding conductor as defined in claim 1 in which the cross-sectional areas of the two bars are substantially proportional to the magnitudes of the currents in the bars.
Claim 4
Dependent Claim
24 words
A winding conductor as defined in claim 2 in which the strands of one bar are wider than the strands of the other bar.
References Cited (Backward Citations)
FR1169012A
Cited
US2896102A
Cited
US3188377A
Cited
US3280244A
Cited
US3381154A
Cited
US3647932A
Cited
USRE27489E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |