CA1311010C - Coil armor tape for new bonding surface and coronox- seal - Google Patents
Coil armor tape for new bonding surface and coronox- sealInfo
- Publication number
- CA1311010C CA1311010C CA000593161A CA593161A CA1311010C CA 1311010 C CA1311010 C CA 1311010C CA 000593161 A CA000593161 A CA 000593161A CA 593161 A CA593161 A CA 593161A CA 1311010 C CA1311010 C CA 1311010C
- Authority
- CA
- Canada
- Prior art keywords
- spacer
- stator
- coils
- corona
- stator coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
54,028 ABSTRACT
Improved turbine generators are disclosed including improved stator coil bracing and methods for bonding stator coils to diamond spacers to reduce the leakage of Corona suppressive compositions, such as CORONOX?. The apparatus and methods described in connection with this invention include wrapping a portion of the stator coils coated with the Corona suppressive compositions with a reinforced layer which has been impregnated with a room-temperature polermerizing resin. The preferred constructions increase the bond strength between the coils and diamond spacers to provide a more homogeneous stator unit.
Improved turbine generators are disclosed including improved stator coil bracing and methods for bonding stator coils to diamond spacers to reduce the leakage of Corona suppressive compositions, such as CORONOX?. The apparatus and methods described in connection with this invention include wrapping a portion of the stator coils coated with the Corona suppressive compositions with a reinforced layer which has been impregnated with a room-temperature polermerizing resin. The preferred constructions increase the bond strength between the coils and diamond spacers to provide a more homogeneous stator unit.
Description
1 31 ~
-1- 54,028 COIL AKMOR TAPE FOR NEW ~ONDING SURFAOE
AN~ CO~ON~X- SEA~
FIELD OF TH~I NVENTION
This invention relates to improvements to the stator end windings of turbine generators for electric power, and particularly to means for minimizing leaching of semi-conductive compounds from the stator winding to bracingcomponent interfaces and to provide a superior bonding surface for bracing components.
BaCKGROUN~ OF TH~ INVENTION
The stator end windings of many o~ today's turbine generators are generally insulated with a semi-conductive compound, such as CORONOX~ which comprises silicon carbide and varnish. Selected surfaces of stator coils are typically painted with CORONOX~ to suppress Corona activity, the art recognized term for electrical discharge from the sides of the coils associated with high voltage gradients. A CORONOX~ protected winding exhibits a surface which is chaIk-like, and generally deficient in mechanical and bonding properties. Moreover, leaching of this compound due to component motion and oil can contribute to poor bracing within the winding.
-1- 54,028 COIL AKMOR TAPE FOR NEW ~ONDING SURFAOE
AN~ CO~ON~X- SEA~
FIELD OF TH~I NVENTION
This invention relates to improvements to the stator end windings of turbine generators for electric power, and particularly to means for minimizing leaching of semi-conductive compounds from the stator winding to bracingcomponent interfaces and to provide a superior bonding surface for bracing components.
BaCKGROUN~ OF TH~ INVENTION
The stator end windings of many o~ today's turbine generators are generally insulated with a semi-conductive compound, such as CORONOX~ which comprises silicon carbide and varnish. Selected surfaces of stator coils are typically painted with CORONOX~ to suppress Corona activity, the art recognized term for electrical discharge from the sides of the coils associated with high voltage gradients. A CORONOX~ protected winding exhibits a surface which is chaIk-like, and generally deficient in mechanical and bonding properties. Moreover, leaching of this compound due to component motion and oil can contribute to poor bracing within the winding.
-2~ 54,028 In thQ late 1960's and early 1970'~, th~ COR9NOX-lay~r was protected by ~ l~yer o~ MYL~R and glass tap~
whlch provi~ed only nominal phy~ic~l prop~r~i~s.
In the late 1970'~ y~r~ o~ SCO$CHPLY~ were applied succes~fully to the largsr inner-cooled coils of the above-mentioned generators. These l~yers wer~ appl~ed in a seml-cured state which wa~ often characterized a~ being tacky to the touch. A~ter wrapping th~ ~tator coils w~th this material, t~e assembly was heated to ~bout 150C for about 10 to 20 h4urs. The curing te~p~rature~ used for this procedure presented a constant threat o~ distorting copper coils, ~pecially thos~ currently in servicQ. In addition, SCOTCBPLY- increased ths scu~f and wear resist~nce of the coil~, yst resulted in a ~lipp~ry ~urface which dld not lS bond sufficiently to other components, ~uch ~8 the 'diamond ~pacers' used to separats the individual coils of the st~tor. Thus, a sanding procedure wa~ instituted to prepare these surfaces to ef~ct a good bond.
Accordingly, a need exists ~or a~ improved stator coil bracing assembly, especially for older in-service windings not protected with SCOTCHPLY- which i~ resi~tant to CORONOX- leaching. There is also a need for a sealing tschnique that permits ~etter bonding between the stator coils and diamond spacers, without heating the stator coils - 25 to 150~.
S~ARY OF T~ V~NrInN
This invention provides novel i~provements to turbine generator~ and methods for sealing stator coils to provide -3- 54,028 improved bonding between the coils and diamond spacers so that the Corona-suppessive, semi-conducting compounds, such as CORONOX~ are prevented from leaching out in service. To achieve these objectives, the portion of the stator coil coated with the Corona-suppressive composition is wrapped with a reinforced and uncured reinforced layer which has been impregnated with a resinou~ material. The successive e'wrapped" coils are then separated with diamond spacers which bond together with the coils as the resinous material cures at room temperature to form a substantially homogeneous bracing. As used herein, the term ~room temperature" refers to ambient or atmospheric temperature.
The invention seals the preferred CORONOX and/or similar compositions from leaching out from the interface between lS the diamond spacers and coils due to the relative motion between the components.
Accordingly, an improved turbine generator and method for bonding and sealing stator coils is provided. The invention substantially eliminates the problems associated with bonding the coils to the diamond spacers.
In the preferred embodiments, the resinous material and reinforced layers are applied to the coils and diamond spacers in an unpolymerized state, so that all the components cure together in homogeneous fashion. Since the selected resinous materials are curable at ambient temperature, there is no adverse effect on the copper coils of the stators. The methods employed by this invention, 13111~ ~
whlch provi~ed only nominal phy~ic~l prop~r~i~s.
In the late 1970'~ y~r~ o~ SCO$CHPLY~ were applied succes~fully to the largsr inner-cooled coils of the above-mentioned generators. These l~yers wer~ appl~ed in a seml-cured state which wa~ often characterized a~ being tacky to the touch. A~ter wrapping th~ ~tator coils w~th this material, t~e assembly was heated to ~bout 150C for about 10 to 20 h4urs. The curing te~p~rature~ used for this procedure presented a constant threat o~ distorting copper coils, ~pecially thos~ currently in servicQ. In addition, SCOTCBPLY- increased ths scu~f and wear resist~nce of the coil~, yst resulted in a ~lipp~ry ~urface which dld not lS bond sufficiently to other components, ~uch ~8 the 'diamond ~pacers' used to separats the individual coils of the st~tor. Thus, a sanding procedure wa~ instituted to prepare these surfaces to ef~ct a good bond.
Accordingly, a need exists ~or a~ improved stator coil bracing assembly, especially for older in-service windings not protected with SCOTCHPLY- which i~ resi~tant to CORONOX- leaching. There is also a need for a sealing tschnique that permits ~etter bonding between the stator coils and diamond spacers, without heating the stator coils - 25 to 150~.
S~ARY OF T~ V~NrInN
This invention provides novel i~provements to turbine generator~ and methods for sealing stator coils to provide -3- 54,028 improved bonding between the coils and diamond spacers so that the Corona-suppessive, semi-conducting compounds, such as CORONOX~ are prevented from leaching out in service. To achieve these objectives, the portion of the stator coil coated with the Corona-suppressive composition is wrapped with a reinforced and uncured reinforced layer which has been impregnated with a resinou~ material. The successive e'wrapped" coils are then separated with diamond spacers which bond together with the coils as the resinous material cures at room temperature to form a substantially homogeneous bracing. As used herein, the term ~room temperature" refers to ambient or atmospheric temperature.
The invention seals the preferred CORONOX and/or similar compositions from leaching out from the interface between lS the diamond spacers and coils due to the relative motion between the components.
Accordingly, an improved turbine generator and method for bonding and sealing stator coils is provided. The invention substantially eliminates the problems associated with bonding the coils to the diamond spacers.
In the preferred embodiments, the resinous material and reinforced layers are applied to the coils and diamond spacers in an unpolymerized state, so that all the components cure together in homogeneous fashion. Since the selected resinous materials are curable at ambient temperature, there is no adverse effect on the copper coils of the stators. The methods employed by this invention, 13111~ ~
-4- 54,028 produce a closer fit between the components and eliminate costly manual sanding steps.
In the more pxeferred embodiments of this invention, a specially devised tape, preferably made of glass-filled polyester, i5 impregnated with a filled polymerizing resin and then wrapped around the por~ion of the coils coated with Corona-suppressive compositions. Alternatively, a piece of fibrous material, such as polyester felt, can be wrapped around the diamond spacers to effect a more accommodating bond when inserted between coils. The polymerizing resins of this invention aid in the attachment of the diamond spacer to the stator coil assembly, so as to form a substantially homogeneous construction for maximizing bracing strength.
It is, therefore, an object of this invention to prevent the leaching of the Corona suppressing compositions from the diamond spacer-coil interfaces.
It is another object of this invention to provide a more homogeneous bracing for the stator coils.
It is still another object of this invention to provide a method for assembling stator components so as to prevent a loosening of its parts.
With these and other objects in view, which will become apparent to one skilled in the art as the description proceeds, this invention resides in the novei construction, combination, arrangement of parts and methods substantially as hereinafter described, and more p~rticularly defined by the attached claims.
1 3 ~
In the more pxeferred embodiments of this invention, a specially devised tape, preferably made of glass-filled polyester, i5 impregnated with a filled polymerizing resin and then wrapped around the por~ion of the coils coated with Corona-suppressive compositions. Alternatively, a piece of fibrous material, such as polyester felt, can be wrapped around the diamond spacers to effect a more accommodating bond when inserted between coils. The polymerizing resins of this invention aid in the attachment of the diamond spacer to the stator coil assembly, so as to form a substantially homogeneous construction for maximizing bracing strength.
It is, therefore, an object of this invention to prevent the leaching of the Corona suppressing compositions from the diamond spacer-coil interfaces.
It is another object of this invention to provide a more homogeneous bracing for the stator coils.
It is still another object of this invention to provide a method for assembling stator components so as to prevent a loosening of its parts.
With these and other objects in view, which will become apparent to one skilled in the art as the description proceeds, this invention resides in the novei construction, combination, arrangement of parts and methods substantially as hereinafter described, and more p~rticularly defined by the attached claims.
1 3 ~
-5- 54,028 BRIEF D~SCRIPTION OF TH~ DR~WINGS
~ he accompanying drawings illustrate a complete embodiment of the invention according to the best mode so far devised for the practical application of the principles thereof, and in which:
FIG. l:- is a partial perspective view of a preferred stator assembly for a turbine generator winding, illustrating a plurality of stator coils separated by diamond spacers and further illustrated by cut-away portions revealing coils coated with a Corona-suppressive composition; and FIG. 2: is a cross-sectional view of a preferred, fully-assembled, three-piece diamond spacer arrangement disposed between adjacent coils.
~ETAILED DES~BIPTION OF T~ INVENTION
Disclosed herein are methods and apparatus which address the problems associated with CORONOX~ leaching from turbine generators, and in particular, from the stator winding assembly. The invention includes applying a reinforced layer around the portion of the stator coils coated with a semi-conducting composition, preferably CORONOX~. The reinforced layer is impregnated with a room temperatùre curing, polymerizing resin, which preferably cures in contact with diamond spacers disposed between adjoining stator coils.
Referring now to FIG. 1, a portion of a stator 100 is illustrated. The stator 100 includes coils 35 disposed in parallel along their longitudinal sides. The coils 35 -6- 54,028 comprise portions 30 coated with a Corona-suppressive composition. The coils 35 further can be cooled by several known methods; such methods ind ude external cooling, and inner cooling, with air, gas or liquid. The coils 35 are preferably spaced apart with diamond spacers 20. The spacers 20, in turn, can be installed with a conformable layer to insure good fit and tightness.
Referring now to FIG. 2, a cross-section of a preferred stator coil banding assembly illustrating a preferred diamond spacer 56 having three sections and wedged between two adjacent coils 50. In this most preferred e~bodiment, the coils 50 have a portion 70 coated with a Corona-suppressive composition, such as CORONOX~. -This composition preferably comprises a ceramic and a resinous solution. A most preferred composition includes silicon carbide, and varnish.
The invention further includes a reinforced layer 60 disposed around the coated portion ~0 of the stator coil 50 and impregnated with a polymerizing resin. This reinforced layer 60 preferably comprises a sheet of material, preferably polymeric, having polyester fiber and/or fiberglass, but also may include whiskers of other reinforcing materials. In a most preferred embodiment, the reinforced polymeric layer 60 comprises a glass-filled polyester tape made of 70% glass filling yarns or picks and 30~ polyester end yarns. The tape generally can have a thickness of about 1.5mm to 2.5mm, preferably 2.0mm. As described substantially in FIG. 1, this tape can be 1 3 1 ~
_7- 54,028 disposed over the coils 35 in a lapped, preferably half-lapped, application 10 to further avoid leachlng of the Corona-suppressive compounds.
The polymerizing resin of this invention should have sufficient sealing and hardening capabilities for providing a good bond between the coils 35 or 50 and diamond spacers 2Q or 56. It should be capable of polymerizing at room temperatures without additional heat, i.e., light and air polymerizing resins. A two-part polymerizing plastic is preferred, i.e., a thermosetting polymer having resin and hardener components, and it is expected that epoxy resins would be ideally suited to the task. As used herein, the term epoxy resins refers to the polyether resin class of polymers having high strength and low shrin~age during curing. It is expected that a fibrous material 52, such as polyester felt, could be employed to further reinforce the sealing capabilities of this polymerizing resin. In a most preferred embodiment, the polyester-glass tape is impregnated with a filled epoxy resin, such as silica filled resin, and then wrapped around the stator coils 50.
In the preferred method of this invention, the tape and resin are applied to the coils 50 as an unpolymerized composition. The diamond spacers 56 are then wrapped in resin impregnated felt and inserted between the prepared moist coils 50. Finally, a polyester~glass banding 54 is applied around two or more prepared coils 5Q. The reinforced layer 60, diamor.d spacers 56 and felt 52 are then cured together to form a homogeneous bracing.
1 3 ~
-8- 54,028 According to this design, the reinforced bracing provides two sheaths of material which must move as a single unit in order to loosen. Also, the re~ulting construction controls the leaching of the semi-conducting compounds used to coat the coils 50~
From the foregoing, it can be realized that this invention provides improved methods and materials for minimizing the loss of Corona-suppressive coatings on stator coils and for impro~ing the bond between stator winding bracing components. Although various embodiments have been illustrated, this was for the purpose of describing, but not limiting, the invention. Various modifications, which will become apparent to one skilled in the art, are within the scope of this invention described 1~ in the attached claims.
~ he accompanying drawings illustrate a complete embodiment of the invention according to the best mode so far devised for the practical application of the principles thereof, and in which:
FIG. l:- is a partial perspective view of a preferred stator assembly for a turbine generator winding, illustrating a plurality of stator coils separated by diamond spacers and further illustrated by cut-away portions revealing coils coated with a Corona-suppressive composition; and FIG. 2: is a cross-sectional view of a preferred, fully-assembled, three-piece diamond spacer arrangement disposed between adjacent coils.
~ETAILED DES~BIPTION OF T~ INVENTION
Disclosed herein are methods and apparatus which address the problems associated with CORONOX~ leaching from turbine generators, and in particular, from the stator winding assembly. The invention includes applying a reinforced layer around the portion of the stator coils coated with a semi-conducting composition, preferably CORONOX~. The reinforced layer is impregnated with a room temperatùre curing, polymerizing resin, which preferably cures in contact with diamond spacers disposed between adjoining stator coils.
Referring now to FIG. 1, a portion of a stator 100 is illustrated. The stator 100 includes coils 35 disposed in parallel along their longitudinal sides. The coils 35 -6- 54,028 comprise portions 30 coated with a Corona-suppressive composition. The coils 35 further can be cooled by several known methods; such methods ind ude external cooling, and inner cooling, with air, gas or liquid. The coils 35 are preferably spaced apart with diamond spacers 20. The spacers 20, in turn, can be installed with a conformable layer to insure good fit and tightness.
Referring now to FIG. 2, a cross-section of a preferred stator coil banding assembly illustrating a preferred diamond spacer 56 having three sections and wedged between two adjacent coils 50. In this most preferred e~bodiment, the coils 50 have a portion 70 coated with a Corona-suppressive composition, such as CORONOX~. -This composition preferably comprises a ceramic and a resinous solution. A most preferred composition includes silicon carbide, and varnish.
The invention further includes a reinforced layer 60 disposed around the coated portion ~0 of the stator coil 50 and impregnated with a polymerizing resin. This reinforced layer 60 preferably comprises a sheet of material, preferably polymeric, having polyester fiber and/or fiberglass, but also may include whiskers of other reinforcing materials. In a most preferred embodiment, the reinforced polymeric layer 60 comprises a glass-filled polyester tape made of 70% glass filling yarns or picks and 30~ polyester end yarns. The tape generally can have a thickness of about 1.5mm to 2.5mm, preferably 2.0mm. As described substantially in FIG. 1, this tape can be 1 3 1 ~
_7- 54,028 disposed over the coils 35 in a lapped, preferably half-lapped, application 10 to further avoid leachlng of the Corona-suppressive compounds.
The polymerizing resin of this invention should have sufficient sealing and hardening capabilities for providing a good bond between the coils 35 or 50 and diamond spacers 2Q or 56. It should be capable of polymerizing at room temperatures without additional heat, i.e., light and air polymerizing resins. A two-part polymerizing plastic is preferred, i.e., a thermosetting polymer having resin and hardener components, and it is expected that epoxy resins would be ideally suited to the task. As used herein, the term epoxy resins refers to the polyether resin class of polymers having high strength and low shrin~age during curing. It is expected that a fibrous material 52, such as polyester felt, could be employed to further reinforce the sealing capabilities of this polymerizing resin. In a most preferred embodiment, the polyester-glass tape is impregnated with a filled epoxy resin, such as silica filled resin, and then wrapped around the stator coils 50.
In the preferred method of this invention, the tape and resin are applied to the coils 50 as an unpolymerized composition. The diamond spacers 56 are then wrapped in resin impregnated felt and inserted between the prepared moist coils 50. Finally, a polyester~glass banding 54 is applied around two or more prepared coils 5Q. The reinforced layer 60, diamor.d spacers 56 and felt 52 are then cured together to form a homogeneous bracing.
1 3 ~
-8- 54,028 According to this design, the reinforced bracing provides two sheaths of material which must move as a single unit in order to loosen. Also, the re~ulting construction controls the leaching of the semi-conducting compounds used to coat the coils 50~
From the foregoing, it can be realized that this invention provides improved methods and materials for minimizing the loss of Corona-suppressive coatings on stator coils and for impro~ing the bond between stator winding bracing components. Although various embodiments have been illustrated, this was for the purpose of describing, but not limiting, the invention. Various modifications, which will become apparent to one skilled in the art, are within the scope of this invention described 1~ in the attached claims.
Claims (18)
1. In a turbine generator of the type having a stator coil disposed within a winding, said coil having a portion thereof coated with a Corona suppressive composition and disposed next to a spacer in said winding, the improvement comprising:
a reinforced layer disposed around at least a part of said coated portion of said stator coil and impregnated with a room temperature polymerizing resin, said reinforced layer and polymerizing resin cured to form a bond between said spacer and said coil.
a reinforced layer disposed around at least a part of said coated portion of said stator coil and impregnated with a room temperature polymerizing resin, said reinforced layer and polymerizing resin cured to form a bond between said spacer and said coil.
2. The turbine generator of claim 1 wherein said Corona suppressive composition comprises a ceramic and a resinous solution.
3. The turbine generator of claim 1 wherein said Corona suppressive composition comprises silicon carbide and varnish.
4. The turbine generator of claim 1 wherein said reinforced layer comprises polyester fiber.
5. The turbine generator of claim 3 wherein said re-inforced layer comprises polyester tape having a thickness of about 1.5mm to about 2.5mm.
54,028
54,028
6. The turbine generator of claim 3 wherein said reinforced layer comprises a polyester tape having a thickness of about 2.0mm.
7. The turbine generator of claim 5 wherein said polyester tape comprises fiberglass.
8. A steam turbine generator of the type having a stator winding having a portion thereof coated with an Corona suppressive composition and disposed next to a spacer, the improvement comprising:
a lapped layer of glass-filled, polyester tape disposed around said coated portion of said stator winding and impregnated with a filled epoxy resin curable at room temperatures.
a lapped layer of glass-filled, polyester tape disposed around said coated portion of said stator winding and impregnated with a filled epoxy resin curable at room temperatures.
9. A method of bracing a stator coil of an electric generator, comprising:
(a) providing a stator coil;
(b) coating a portion of said stator coil with a Corona suppressive composition to form a sealed portion;
(c) inserting a spacer next to said stator coil;
(d) disposing a reinforced layer impregnated with an ambient temperature polymerizing resin around said sealed portion of said stator coil and in contact with said spacer.
(a) providing a stator coil;
(b) coating a portion of said stator coil with a Corona suppressive composition to form a sealed portion;
(c) inserting a spacer next to said stator coil;
(d) disposing a reinforced layer impregnated with an ambient temperature polymerizing resin around said sealed portion of said stator coil and in contact with said spacer.
10. The method of claim 9 wherein said coating step comprises sealing said portion of said stator coil with a composition comprising a ceramic and resinous solution.
11. The method of claim 9 wherein said coating step comprises sealing said portion of said stator coil with a composition comprising silicon carbide and varnish.
12. The method of claim 10 wherein said disposing step comprises wrapping a glass-reinforced, polyester tape around said sealed portion, and in contact with said spacer.
13. The method of claim 12 wherein said wrapping step comprises impregnating said tape with a two-part polymerizing plastic.
14. The method of claim 12 wherein said wrapping step comprises impregnating said tape with a filled epoxy resin.
15. The method of claim 9 further comprising selecting a spacer comprising a fibrous surface thereon.
16. The method of claim 9 further comprises selecting a spacer wrapped in polyester felt.
17. The method of any one of claims 9 to 16, further comprising permitting said polymerizing resin to solidify, whereby a substantially continuous joint is provided between said coated portion of said stator coil and said spacer.
18. A method of bracing the stator coils of an electric generator, comprising:
(a) providing a pair of stator coils;
(b) coating a portion of each of said stator coils with a Corona suppressive composition comprising silicon carbide and varnish;
(c) disposing a glass polyester tape impregnated with a filled epoxy resin around said coated portion of each of said stator coils; and (d) disposing a diamond spacer between said coated portions, whereby said filled epoxy resin comes into contact with said diamond spacer; and (e) permitting said filled epoxy resin to solidify at room temperature, thereby forming a bond between said diamond spacer and said coils for preventing the leakage of said Corona suppressive composition.
(a) providing a pair of stator coils;
(b) coating a portion of each of said stator coils with a Corona suppressive composition comprising silicon carbide and varnish;
(c) disposing a glass polyester tape impregnated with a filled epoxy resin around said coated portion of each of said stator coils; and (d) disposing a diamond spacer between said coated portions, whereby said filled epoxy resin comes into contact with said diamond spacer; and (e) permitting said filled epoxy resin to solidify at room temperature, thereby forming a bond between said diamond spacer and said coils for preventing the leakage of said Corona suppressive composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000593161A CA1311010C (en) | 1989-03-06 | 1989-03-06 | Coil armor tape for new bonding surface and coronox- seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000593161A CA1311010C (en) | 1989-03-06 | 1989-03-06 | Coil armor tape for new bonding surface and coronox- seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311010C true CA1311010C (en) | 1992-12-01 |
Family
ID=4139747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000593161A Expired - Lifetime CA1311010C (en) | 1989-03-06 | 1989-03-06 | Coil armor tape for new bonding surface and coronox- seal |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1311010C (en) |
-
1989
- 1989-03-06 CA CA000593161A patent/CA1311010C/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3974314A (en) | Electrical insulation particularly for use in winding slots of dynamo-electric machines and method for its manufacture | |
| CA1044299A (en) | End winding conductor securing arrangement for turbine generators | |
| CA2344564C (en) | Graded electric field insulation system for dynamoelectric machine | |
| US6140733A (en) | Conductor winding configuration for a large electrical machine | |
| US3388458A (en) | Insulation means and moisture sealing of armatures | |
| US4831303A (en) | Coil armor tape for new bonding surface and CORONOX seal | |
| US4387317A (en) | Method and apparatus for securing end winding conductors | |
| US3505729A (en) | Method of making stators for dynamoelectric machines | |
| CA2353584C (en) | Method to reduce partial discharge in high voltage stator coil's roebel filler | |
| CA1311010C (en) | Coil armor tape for new bonding surface and coronox- seal | |
| US6936128B2 (en) | Reinforced, pressure-resistant flexible tube for mechanical end-winding support for rotating electrical machines | |
| US2713715A (en) | Coil making method | |
| US3242358A (en) | Encapsulated electrical members and method of making the same | |
| US3400454A (en) | Method of making encapsulated electrical members | |
| US3330977A (en) | Dynamoelectric machine stators and method of making same | |
| GB2118483A (en) | Insulating material for the windings of a coil of metallic foil | |
| CA1206194A (en) | Electrostatic grading layer for the surface of an electrical insulation exposed to high electrical stress | |
| US4853577A (en) | Semi-rigid spacer for diamond area of dynamoelectric machine | |
| JPS61189155A (en) | Manufacture of rotary electric machine | |
| JPH0670516A (en) | Manufacture of stator for electric rotary machine | |
| JPS624937B2 (en) | ||
| JPS6247281B2 (en) | ||
| JP3133090B2 (en) | Insulation method for salient field winding | |
| JP2024148868A (en) | Prepreg mica tape, rotating electric machine, and method for manufacturing rotating electric machine | |
| JPS62210850A (en) | Insulating treatment for electric coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |