US3657808A
Expired / Lapsed
US
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Methods of constructing electrical coils
Assignee: Westinghouse Electric Corp
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Filing: 1970-08-21
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Granted: 1972-04-25
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Expires: 1990-08-21
Abstract
Abstract A method of constructing electrical coils of the cylindrical type for high temperature dry type transformers, wherein the coil collars are formed of a plurality of first and second plies of insulating materials stacked in a predetermined sequence to a predetermined build dimension. At least the first plies are impregnated with a thermosettable resin which has been advanced to an intermediate state, still fusible but dry to the touch, and which is subsequently cured to a solid infusible state to consolidate the collars into unitary laminated assemblies.
Inventors
- 👤 Frank R Zickar
- 👤 Frank W Benke
- 👤 James L Rotruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:11
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/125; H01F27/00; H01F27/28; H01F27/30; H01F27/306; H01F27/32; H01F27/324; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
200 words
A method of constructing an electrical winding assembly, comprising the steps of: providing a winding form, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet of insulating material impregnated with a thermosettable resin in a heat fusible stage which is dry to the touch, cutting a plurality of second plies having said predetermined configuration from A sheet of asbestos, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a first stack having a predetermined build dimension, wrapping the first stack about the winding form to provide a first insulating collar, winding an insulated electrical conductor about the winding form, to provide a coil assembly having first and second ends, with the first end starting at the first insulating collar, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a second stack having a predetermined build dimension, wrapping the second stack about the winding form at the second end of the coil assembly, to provide a second insulating collar, and heating said first and second insulating collars to cure the heat fusible resin in the first plies to a solid, infusible state.
Claim 2
Independent Claim
200 words
A method of constructing an electrical winding assembly, comprising the steps of: providing a winding form, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet of insulating material impregnated with a thermosettable resin in a heat fusible stage which is dry to the touch, cutting a plurality of second plies having said predetermined configuration from A sheet of asbestos, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a first stack having a predetermined build dimension, wrapping the first stack about the winding form to provide a first insulating collar, winding an insulated electrical conductor about the winding form, to provide a coil assembly having first and second ends, with the first end starting at the first insulating collar, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a second stack having a predetermined build dimension, wrapping the second stack about the winding form at the second end of the coil assembly, to provide a second insulating collar, and heating said first and second insulating collars to cure the heat fusible resin in the first plies to a solid, infusible state.
Claim 3
Dependent Claim
34 words
The method of claim 1 including the steps of impregnating the coil assembly, including the first and second insulating collars, with a liquid resinous composition, and curing the resinous composition to an infusible solid.
Claim 4
Dependent Claim
82 words
The method of claim 1 wherein the length dimension of the first and second plies is less than the circumferential dimension of the winding form, providing a predetermined gap between the ends of the first and second stacks of plies when the stacks are wrapped about the winding form, and including the steps of forming leads on the first and second ends of the coil assembly by directing the coil conductor through the gap provided in the first and second insulating collars.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein the steps of stacking the first and second plies to form the first and second stacks include placing the first plies at both outer sides of the stack.
Claim 6
Dependent Claim
33 words
The method of claim 1 including the steps of taping the first and second stacks to the winding form after the steps of wrapping the first and second stacks about the winding form.
Claim 7
Independent Claim
157 words
The method of constructing an electrical winding assembly, comprising the steps of: providing a winding tube, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet impregnated with a thermosettable resin which is in the heat fusible B-stage, cutting a plurality of second plies having said predetermined configuration from a sheet of asbestos, winding an insulated electrical conductor about said winding tube to provide an electrical coil having first and second ends, providing first and second insulating collars on said winding tube on the first and second ends of said electrical coil, respectively, with each of said first and second insulating collars including both said first and second plies disposed in stacked, superposed relation, in a predetermined sequence, with the first plies being disposed at the outer sides of the stack, and heating said first and second insulating collars to cure the heat fusible resin in said first plies to a non-fusible solid.
Claim 8
Independent Claim
157 words
The method of constructing an electrical winding assembly, comprising the steps of: providing a winding tube, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet impregnated with a thermosettable resin which is in the heat fusible B-stage, cutting a plurality of second plies having said predetermined configuration from a sheet of asbestos, winding an insulated electrical conductor about said winding tube to provide an electrical coil having first and second ends, providing first and second insulating collars on said winding tube on the first and second ends of said electrical coil, respectively, with each of said first and second insulating collars including both said first and second plies disposed in stacked, superposed relation, in a predetermined sequence, with the first plies being disposed at the outer sides of the stack, and heating said first and second insulating collars to cure the heat fusible resin in said first plies to a non-fusible solid.
Claim 9
Dependent Claim
35 words
The method of claim 6 including the steps of impregnating the coil assembly, including the first and second insulating collars, with a liquid thermosettable resinous composition, and curing the resinous composition to a non-fusible solid.
Claim 10
Dependent Claim
69 words
The method of claim 6 wherein the length dimension of the first and second plies is less than the circumferential dimension of the winding tube, providing a gap between the ends of the first and second collars, and including the steps of forming leads on the first and second ends of the coil assembly by directing the coil conductor through the gaps provided in the first and second collars.
Claim 11
Dependent Claim
33 words
The method of claim 6 including the steps of taping the first and second collars to the winding form, prior to the step of heating the collars to cure the heat fusible resin.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |