Patent US4200818A successfully refreshed from Google Patents.
US4200818A
Expired / Lapsed
US
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Resin impregnated aromatic polyamide covered glass based slot wedge for large dynamoelectric machines
Assignee: Westinghouse Electric Corp
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Filing: 1978-08-01
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Granted: 1980-04-29
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Expires: 1998-08-01
Abstract
Abstract An iron engaging slot wedge, for use in coil slots of dynamoelectric machines is made of a glass fiber core impregnated with a cured thermoset resin, and covered on at least two sides with a facing layer of a porous aromatic polyamide mat, impregnated with a cured thermoset resin.
Inventors
- 👤 Charles R. Ruffing
- 👤 Smith A. Gause
- 👤 John C. Botts
- 👤 Harry E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:24
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/493; H02K15/00; H02K15/13; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/19; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
An iron engaging slot wedge adapted to be positioned in the coil slots of a dynamoelectric machine comprising a glass fiber core impregnated with a cured thermoset resin, and covered, on at least two sides, with a facing layer of a mat of aromatic polyamide fiber, impregnated with a cured thermoset resin.
Claim 2
Dependent Claim
52 words
An iron engaging slot wedge adapted to be positioned in the coil slots of a dynamoelectric machine comprising a glass fiber core impregnated with a cured thermoset resin, and covered, on at least two sides, with a facing layer of a mat of aromatic polyamide fiber, impregnated with a cured thermoset resin.
Claim 3
Dependent Claim
21 words
The slot wedge of claim 1, having an interlaminar shear strength of over about 2,500 lb./in. of length at 100° C.
Claim 4
Dependent Claim
27 words
The slot wedge of claim 1, wherein the glass fiber core is in spiral form, and the facing layer covers the iron engaging sides of the wedge.
Claim 5
Dependent Claim
33 words
The slot wedge of claim 1, wherein the facing layer is a single layer in non-woven form and the thickness ratio of glass fiber core:facing layer is between about 10:1 to about 100:1.
Claim 6
Dependent Claim
45 words
The slot wedge of claim 1, wherein the glass fiber core is between about 0.2 inch to 0.5 inch thick and impregnated between about 40 wt.% to about 60 wt.% with a cured resin selected from the group consisting of epoxy resin and phenolic resin.
Claim 7
Dependent Claim
53 words
The slot wedge of claim 1, wherein the facing layer is between 0.005 inch to about 0.025 inch thick, impregnated with a cured resin selected from the group consisting of epoxy resin and phenolic resin, and the aromatic polyamide consists essentially of a poly (phenylenephthalamide) having about 95% to 100% resiliency against compaction.
Claim 8
Dependent Claim
25 words
The slot wedge of claim 6, wherein the facing layer consists essentially of a poly (phenylenephthalamide) having a tensile strength of over about 250,000 lb./sq.in.
Claim 9
Dependent Claim
15 words
The slot wedge of claim 6, wherein the aromatic polyamide consists essentially of poly (1,4-phenyleneterephthalamide).
Claim 10
Dependent Claim
25 words
The slot wedge of claim 6 wherein the core resin impregnant is an epoxy resin and the facing layer resin impregnant is a phenolic resin.
Claim 11
Dependent Claim
17 words
A generator comprising a stator containing a plurality of slot wedges having the construction of claim 6.
Claim 12
Dependent Claim
93 words
In the coil slot of a dynamoelectric machine, a laminated, slot wedge facing wound coils consisting essentially of a glass fiber core impregnated between about 40 wt.% to about 60 wt.% with a cured thermoset resin, and covered, on at least two sides, with a resilient facing layer consisting essentially of a poly (phenylenephthalamide) fiber matrix of at least 70% porosity, impregnated with about 60 wt.% to about 80 wt.% of a cured thermoset resin, said slot wedge having an interlaminar shear strength of over about 2,500 lb./in. of length at 100° C.
Claim 13
Dependent Claim
93 words
In the coil slot of a dynamoelectric machine, a laminated, slot wedge facing wound coils consisting essentially of a glass fiber core impregnated between about 40 wt.% to about 60 wt.% with a cured thermoset resin, and covered, on at least two sides, with a resilient facing layer consisting essentially of a poly (phenylenephthalamide) fiber matrix of at least 70% porosity, impregnated with about 60 wt.% to about 80 wt.% of a cured thermoset resin, said slot wedge having an interlaminar shear strength of over about 2,500 lb./in. of length at 100° C.
Claim 14
Dependent Claim
62 words
The slot wedge of claim 11, wherein the facing layer consists essentially of poly (1,4-phenyleneterephthalamide), the core resin impregnant is an epoxy resin, the covering layer resin impregnant is a phenolic resin, the thickness ratio of glass fiber core:facing layer is between about 10:1 to about 100:1; and the thickness of the core is between about 0.2 inch to about 0.5 inch.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |