US3839653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible loop, hard slot coils for dynamoelectric machine windings
Assignee: General Electric Co
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Filing: 1973-04-12
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Granted: 1974-10-01
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Expires: 1993-04-12
Abstract
Abstract A dynamoelectirc machine coil wound in a closed loop having elongated slot regions adapted for insertion into axially extending slots in a magnetic member of a dynamoelectric machine, and having end loop regions that interconnect the respective adjacent ends of the slot regions. The coil has a homogeneous insulating tape wrapped over its entire length with a compatible thermosetting insulating resin system impregnated in the tape. The resin system, and resultant coils, are characterized by having means for effecting a differential cure of the slot regions and the end loop regions of the coil thereby to fully cure the slot regions to a hard finish and partially cure the end loop regions so that they remain flexible to facilitate installation of the coils into the slots of a dynamoelectric machine magnetic member.
Inventors
- 👤 N Beddows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:28
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12; H02K15/06; H02K15/062; H02K15/065; H02K15/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
A pre-formed coil for a dynamoelectric machine comprising a plurality of conductors wound in a closed loop and shaped to a coil characterized by elongated slot regions for insertion in axially extending cavities of a magnetic member of a dynamoelectric machine and loop regions interconnecting the ends of said slot regions, said entire length of the coil being wrapped with a homogeneous tape having a compatible thermosetting insulating resin system impregnated therein, the portion of said insulating resin system impregnated within the tape wrapped atop said slot regions of said coil being fully cured to a rigid structure and the portion of the insulating resin system applied to the tape wrapped atop the loop regions of said coil being only partially cured to a gel state to provide a hard slot, flexible loop coil, said thermosetting insulating system comprising two or more resins having different degrees of functionality and composition, the weight percentages of the resins applied to the slot regions of the coil varying relative to the weight percentages of the same resins in the loop regions of the coil to produce a complete cure of the resin system in the slot regions of the coil and a partial cure in the resin system applied to the loop regions of the coil.
Claim 2
Dependent Claim
213 words
A pre-formed coil for a dynamoelectric machine comprising a plurality of conductors wound in a closed loop and shaped to a coil characterized by elongated slot regions for insertion in axially extending cavities of a magnetic member of a dynamoelectric machine and loop regions interconnecting the ends of said slot regions, said entire length of the coil being wrapped with a homogeneous tape having a compatible thermosetting insulating resin system impregnated therein, the portion of said insulating resin system impregnated within the tape wrapped atop said slot regions of said coil being fully cured to a rigid structure and the portion of the insulating resin system applied to the tape wrapped atop the loop regions of said coil being only partially cured to a gel state to provide a hard slot, flexible loop coil, said thermosetting insulating system comprising two or more resins having different degrees of functionality and composition, the weight percentages of the resins applied to the slot regions of the coil varying relative to the weight percentages of the same resins in the loop regions of the coil to produce a complete cure of the resin system in the slot regions of the coil and a partial cure in the resin system applied to the loop regions of the coil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |