US4021764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-wound transformer coils with reduced edge heating
Assignee: General Electric Co
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Filing: 1975-12-08
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Granted: 1977-05-03
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Expires: 1995-12-08
Abstract
Abstract In sheet-wound transformer coils, excessive ohmic losses due to high current density at the sheet edges caused by a radial magnetic leakage field are avoided by adding ferrite ceramic disks, or disks and strips, adjacent each axial end of the coils, to lead magnetic leakage flux axially out of the sheet metal windings.
Inventors
- 👤 Oliver H. Winn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:35
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/34; H01F27/36; H01F27/366
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
An electrical transformer comprising: at least one conductive sheet overlaid by insulation; a magnetic core, said conductive sheet being wound continuously in a plurality of turns about a first leg of said core; and a magnetic disk situated closely adjacent at least one axial edge of said turns for carrying a large radial component of the magnetic flux leakage field established by current flow through said conductive sheet, said core comprising a second leg radially outside the wound conductive sheet and being integrally joined to said first leg axially outside of said ceramic disk.
Claim 2
Dependent Claim
94 words
An electrical transformer comprising: at least one conductive sheet overlaid by insulation; a magnetic core, said conductive sheet being wound continuously in a plurality of turns about a first leg of said core; and a magnetic disk situated closely adjacent at least one axial edge of said turns for carrying a large radial component of the magnetic flux leakage field established by current flow through said conductive sheet, said core comprising a second leg radially outside the wound conductive sheet and being integrally joined to said first leg axially outside of said ceramic disk.
Claim 3
Dependent Claim
24 words
The electrical transformer of claim 1 wherein said ceramic disk is of annular configuration generally coextensive with the cross sectional area of said turns.
Claim 4
Dependent Claim
17 words
The electrical transformer of claim 1 wherein said ceramic disk is comprised of a manganese zinc ferrite.
Claim 5
Dependent Claim
17 words
The electrical transformer of claim 2 wherein said ceramic disk is comprised of a manganese zinc ferrite.
Claim 6
Dependent Claim
119 words
An electrical transformer comprising: a core of magnetic material; a first coil wound about a first leg of said core, said first coil being formed from a first conductive sheet overlaid by insulation; a second coil wound about said first coil, said second coil including a second conductive sheet overlaid by insulation; and a magnetic ceramic disk situated closely adjacent at least one axial edge of each of said first and second coils for carrying a large radial component of the magnetic flux leakage field established by current flow through said conductive sheet, said core comprising a second leg radially outside the wound conductive sheets and being integrally joined to said first leg axially outside of said ceramic disk.
Claim 7
Dependent Claim
119 words
An electrical transformer comprising: a core of magnetic material; a first coil wound about a first leg of said core, said first coil being formed from a first conductive sheet overlaid by insulation; a second coil wound about said first coil, said second coil including a second conductive sheet overlaid by insulation; and a magnetic ceramic disk situated closely adjacent at least one axial edge of each of said first and second coils for carrying a large radial component of the magnetic flux leakage field established by current flow through said conductive sheet, said core comprising a second leg radially outside the wound conductive sheets and being integrally joined to said first leg axially outside of said ceramic disk.
Claim 8
Dependent Claim
17 words
The electrical transformer of claim 5 wherein said ceramic disk is comprised of a manganese zinc ferrite.
Claim 9
Dependent Claim
28 words
The electrical transformer of claim 5 wherein said ceramic disk is of annular configuration generally coextensive with the combined cross sectional area of said first and second coils.
Claim 10
Dependent Claim
64 words
The electrical transformer of claim 5 wherein said ceramic disk is of annular configuration generally coextensive with the cross sectional area of said first coil, said transformer further including first and second ceramic strips situated adjacent the perimeter of said ceramic disk, each of said first and second ceramic strips being substantially coextensive with a first and second portion, respectively, of said second coil.
Claim 11
Dependent Claim
19 words
The electrical transformer of claim 8 wherein said first and second ceramic strips are integral with said ceramic disk.
Claim 12
Dependent Claim
49 words
The electrical transformer of claim 8 wherein said core of magnetic material includes a center leg and two outer legs, said first coil being wound about said center leg and said first and second ceramic strips being aligned between each of said outer legs, respectively, and said center leg.
Claim 13
Dependent Claim
19 words
The electrical transformer of claim 10 wherein said first and second ceramic strips are integral with said ceramic disk.
References Cited (Backward Citations)
US1335837A
Cited
US2850707A
Cited
US2962679A
Cited
US2907965A
Cited
GB827506A
Cited
US3014189A
Cited
GB1030842A
Cited
US3366907A
Cited
FR1557420A
Cited
US3663910A
Cited
US3609613A
Cited
US3750070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |