Patent US4008409A successfully refreshed from Google Patents.
US4008409A
Expired / Lapsed
US
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Dynamoelectric machine core and coil assembly
Assignee: General Electric Co
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Filing: 1975-04-09
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Granted: 1977-02-15
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Expires: 1995-04-09
Abstract
Abstract A dynamoelectric machine core and coil assembly characterized by having a separately insertable conformable side filler, such as resin impregnated fiber glass provided with a plurality of ridges of an electrically semi-conductive, pressure-deformable elastomer bonded to one side thereof. In the assembly the conformable side filler is compressed between the side of a coil-receiving laminated core slot and the relatively smooth sides of coil windings mounted in the slot. As thus compressed, the side filler forms a good thermally conductive path between the somewhat irregular coil sides and the core to thereby prevent undesirable temperature rises. The side fillers also prevent insulation-destroying vibration of the coils in the slots, and due to the semi-conductive nature of the side fillers, they prevent the formation of corona across any voids that might exist between the sides of the coil insulation and the sides of the coil-receiving slots.
Inventors
- 👤 Ralph G. Rhudy
- 👤 Hans H. Casanova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:27
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/22; H02K5/225; H02K11/00; H02K11/40; H02K3/00; H02K3/32; H02K3/40; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/19; Y10S174/20; Y10S174/26; Y10S174/27; Y10S174/28; Y10S174/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A dynamoelectric machine core and coil winding assembly comprising a core stack of magnetic metal laminations formed with coil-receiving slots therein, an electrical winding of interconnected coils having their sides disposed, respectively, in said slots and having their end turns extending beyond the ends of the core stack, a rigid coating of insulating material disposed around each coil side to insulate the coils from the core stack, in combination with generally flat mats of semi-conducting material each having a plurality of ridges of electrically semi-conductive, pressure-deformable room temperature vulcanizing silicone rubber bonded to one side thereof, said rubber bonded to the mats comprising 50 to 80 percent by weight silicone rubber loaded with 20 to 30 percent carbon powdered material, said mats being positioned respectively, one in each of said slots with the rubber coated side of each mat compressed against the side of a slot by the coil side mounted therein.
Claim 2
Dependent Claim
152 words
A dynamoelectric machine core and coil winding assembly comprising a core stack of magnetic metal laminations formed with coil-receiving slots therein, an electrical winding of interconnected coils having their sides disposed, respectively, in said slots and having their end turns extending beyond the ends of the core stack, a rigid coating of insulating material disposed around each coil side to insulate the coils from the core stack, in combination with generally flat mats of semi-conducting material each having a plurality of ridges of electrically semi-conductive, pressure-deformable room temperature vulcanizing silicone rubber bonded to one side thereof, said rubber bonded to the mats comprising 50 to 80 percent by weight silicone rubber loaded with 20 to 30 percent carbon powdered material, said mats being positioned respectively, one in each of said slots with the rubber coated side of each mat compressed against the side of a slot by the coil side mounted therein.
Claim 3
Dependent Claim
27 words
An assembly as defined in claim 1 wherein each of said mats is substantially as wide as the depth of the slot in which it is disposed.
Claim 4
Dependent Claim
38 words
An assembly as defined in claim 2 wherein each of said mats is formed of fiber glass having a resin coating cured thereon, said resin coating being filled with a conducting material to make the coating electrically semi-conductive.
Claim 5
Dependent Claim
52 words
An assembly as defined in claim 2 wherein each mat is in the range of 10 to 20 mils thick, and each ridge bonded to said mats is generally triangular in cross-section with the maximum vertical axis of said triangular cross-sections being in the range of 30 to 70 mils in height.
Claim 6
Dependent Claim
29 words
An assembly as defined in claim 2 wherein the ends of each of said mats are spaced, respectively, between 1 and 5 inches from the ends of said slot.
Claim 7
Dependent Claim
34 words
An assembly as defined in claim 4 wherein the room temperature vulcanizing rubber bonded to the mats comprises 50 to 80% by weight silicone rubber loaded with 20 to 30% by weight carbon powder.
Claim 8
Dependent Claim
38 words
An assembly as defined in claim 4 wherein said ridges are substantially parallel and extend the full length of the mat on which they are mounted, there being approximately 20 ridges per inch of width on each mat.
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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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |