Patent US5214839A successfully refreshed from Google Patents.
US5214839A
Expired / Lapsed
US
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Method of making dynamoelectric machines including metal filled glass cloth slot closure wedges
Assignee: General Electric Co
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Filing: 1992-09-15
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Granted: 1993-06-01
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Expires: 2012-09-15
Abstract
Abstract A high permeability slot wedge for a dynamoelectric machine with the wedge configured as an elongated bar of uniform cross-sectional configuration formed of a ferromagnetic material having modestly good electrically insulative properties comprising approximately by weight 60% to 80% relatively small ferromagnetic particles such as powdered iron, about 10% reinforcing glass fabric; and 15% to 20% unsaturated thermosetting plastic resin binder such as a polyester resin is disclosed. The ferromagnetic material is homogeneously distributed throughout the thermosetting plastic binder so that the permeability and resistivity of the resulting wedge is substantially uniform throughout.
Inventors
- 👤 John C. Rieber
- 👤 Jeffrey S. McCoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:12
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/13; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/493; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste with the ferromagnetic material forming at least 75% of the paste by weight; impregnating a carrier fabric with the paste; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5; and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along the length thereof.
Claim 2
Independent Claim
107 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste with the ferromagnetic material forming at least 75% of the paste by weight; impregnating a carrier fabric with the paste; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5; and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along the length thereof.
Claim 3
Dependent Claim
60 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 1 wherein the step of compression molding includes the preliminary steps of superposing a protective layer of inert film on each of the impregnated carrier fabric and squeezing the layer protected impregnated carrier fabric to promote spreading of the paste throughout the fabric.
Claim 4
Dependent Claim
35 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 2 including the further preliminary step of cutting the layer protected squeezed impregnated carrier fabric into individual sheets.
Claim 5
Dependent Claim
55 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 3 wherein the step of mixing includes the addition of a thickening agent, and further comprising the step of allowing the thickening agent to thicken the paste over a period of time prior to the step of cutting.
Claim 6
Independent Claim
107 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste; impregnating a carrier fabric with the paste, the ferromagnetic material forming at least 60% by weight of the impregnated carrier fabric; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5, and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along length thereof.
Claim 7
Independent Claim
107 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste; impregnating a carrier fabric with the paste, the ferromagnetic material forming at least 60% by weight of the impregnated carrier fabric; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5, and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along length thereof.
Claim 8
Dependent Claim
60 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 5 wherein the step of compression molding includes the preliminary steps of superposing a protective layer of inert film on side of the impregnated carrier fabric and squeezing the layer protected impregnated carrier fabric to promote spreading of the paste throughout the fabric.
Claim 9
Dependent Claim
35 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 6 including the further preliminary step of cutting the layer protected squeezed impregnated carrier fabric into individual sheets.
Claim 10
Dependent Claim
55 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 7 wherein the step of mixing includes the addition of a thickening agent, and further comprising the step of allowing the thickening agent to thicken the paste over a period of time prior to the step of cutting.
Claim 11
Independent Claim
103 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste; impregnating a carrier fabric with the paste; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5, and an electrical resistivity of at least two ohm-centimeters; and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along the length thereof.
Claim 12
Independent Claim
103 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine comprising the steps of: mixing a powered ferromagnetic material and an uncured polyester resin to form a paste; impregnating a carrier fabric with the paste; compression molding the impregnated carrier fabric to form a sheet and to polymerize the resin, the resulting formed and polymerized sheet having a relative permeability in the range of 3 to 5, and an electrical resistivity of at least two ohm-centimeters; and machining the formed and polymerized sheet to transform the sheet into an elongated bar having a generally uniform cross-sectional configuration along the length thereof.
Claim 13
Dependent Claim
33 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 9 wherein the ferromagnetic material forms at least 60% of the impregnated carrier fabric by weight.
Claim 14
Dependent Claim
61 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 9 wherein the step of compression molding includes the preliminary steps of superposing a protective layer of inert film on each side of the impregnated carrier fabric and squeezing the layer protected impregnated carrier fabric to promote spreading of the paste throughout the fabric.
Claim 15
Dependent Claim
35 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 11 including the further preliminary step of cutting the layer protected squeezed impregnated carrier fabric into individual sheets.
Claim 16
Dependent Claim
54 words
The method of manufacturing an insulating slot wedge for a dynamoelectric machine as set forth in claim 12 wherein the step of mixing includes addition of a thickening agent, and further comprising the step of allowing the thickening agent to thicken the paste over a period of time prior to the step of cutting.
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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) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |