JP4004028B2 - Stator coil of rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator coil provided in a rotating electrical machine such as an electric motor or a generator, and more particularly to a stator coil of a rotating electrical machine that is insulated by vacuum and pressure impregnation.
[0002]
[Prior art]
Conventionally, as shown in FIG. 1, as a stator coil of this type of rotating electrical machine, a mica sheet or mica tape is applied a plurality of times on a strand conductor 1 formed by bundling a plurality of strands coated with an insulating coating. After forming the stator coil 3 having the coil insulating layer 2 by winding, the whole is vacuum-dried, and the stator coil 3 is housed and connected to the stator core slot 4, and the stator core 5 and the insulating structure are formed in the gaps of the insulating structure. There is an all-impregnation method in which a solventless impregnation resin such as epoxy is impregnated with vacuum and pressure and then cured by heating.
[0003]
In this case, in order to prevent partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot is provided. Corona comprising a glass fiber tape or sheet impregnated and cured with a resin containing a conductive filler such as carbon powder, or a tape or sheet cured by applying the resin to one or both sides of a polymer film A corona-preventing layer 6 is applied by winding a preventive material or the like.
[0004]
[Problems to be solved by the invention]
However, conventional corona preventing materials such as glass fiber tape have poor resin retainability and heat shrinkability when impregnated resin is impregnated and cured. Therefore, in the coil insulating layer 2 or the corona preventing layer 6 and the coil insulating layer 2. Peeling or voids may occur due to the falling of the impregnating resin at the interface. Since the peeling and voids cause a decrease in the dielectric properties of the coil insulating layer 2, a film having heat shrinkability is wound around the surface of the coil insulating layer 2 in addition to the corona-preventing material to prevent the impregnating resin from falling off. It is turning.
[0005]
Further, the conventional corona-preventing material using the heat-shrinkable polymer film is wound with a certain portion overlapped on the surface of the coil insulating layer 2. At this time, wrinkles are partially generated on the film, but the overlapping portions without wrinkles are in close contact with each other. Since the overlapping portion where the films are in close contact with each other is further adhered during the vacuum and pressure impregnation, the infiltration of the impregnating resin from the corona prevention layer 6 is inhibited, and the interface between the corona prevention layer 6 and the coil insulating layer 2 or the corona prevention material. In some cases, the impregnated resin is not impregnated or dropped out between the overlapping portions of the film, and may be peeled off or voided after the impregnation and curing.
[0006]
As described above, this peeling or void is a factor that lowers the dielectric characteristics of the coil insulating layer 2, and this peeling or void is gradually enlarged due to thermal degradation or thermal shrinkage during the operation of the rotating electrical machine. And the corona prevention layer 6 may be gradually lost due to the heat of partial discharge.
[0007]
Since this defective portion is not electrically connected to the stator core 5 and does not have the same potential, slot discharge occurs in the stator coil 3 and the stator core 5. Further, the missing portion is enlarged due to electromagnetic vibration or the like during long-term operation, and eventually the coil insulating layer 2 may be damaged, leading to a decrease in insulation characteristics.
[0008]
Therefore, the present invention eliminates the need to wind a film having heat shrinkability separately from the corona prevention material around the surface of the coil insulation layer in order to prevent the impregnating resin from falling off. There is no exfoliation or voiding due to the impregnation resin not being impregnated or falling out of the resin at the interface between the coil and the coil insulation layer or in the corona prevention layer. It is an object of the present invention to provide a stator coil for a rotating electrical machine in which a coil insulating layer is not damaged due to deterioration, heat shrinkage, electromagnetic vibration, or the like, thereby causing deterioration of insulating characteristics.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a stator core in which a corona-preventing layer is provided on the surface of an insulating layer formed by multiple winding of unimpregnated laminated mica tape on a wire bundle on which an insulating coating is applied. In a stator coil of a rotating electrical machine, which is immersed in a thermosetting resin together with the stator core, vacuum impregnation treatment, and heat-cured, the corona prevention layer is made of a semiconductive resin. A corona-preventing tape comprising a laminated mica insulating member composed of the same laminated mica as the laminated mica constituting the laminated mica tape and an epoxy resin composition on the opposite surface of the applied heat-shrinkable polymer film, or It is set as the structure formed by winding a sheet | seat.
[0010]
In the stator coil of the rotating electrical machine according to the first aspect of the present invention, since the laminated mica insulating member is integrated with the heat-shrinkable polymer film, the familiarity with the coil insulating layer made of the same laminated mica is good. Since the laminated mica insulating member with good impregnation property is disposed between the overlapping parts of the prevention material, the impregnation resin is not impregnated or dropped out between the interface between the corona prevention layer and the insulating layer and between the overlapping parts of the corona prevention material.・ No peeling or voiding after curing. Therefore, the coil insulating layer is not damaged by the deterioration of the dielectric characteristics of the stator coil insulation or the long-term operation of the rotating electric machine due to thermal degradation, thermal contraction, electromagnetic vibration, or the like, and the insulation characteristics are not lowered.
[0013]
According to a second aspect of the present invention, there is provided a corona-preventing layer on the surface of an insulating layer formed by multiple winding of unimpregnated laminated mica tape on a bundle of strands on which insulation coating has been applied, and after the stator core is stored and connected, the stator In a stator coil of a rotating electrical machine, which is immersed in a thermosetting resin together with an iron core, heat-cured after vacuum pressure impregnation treatment, the corona-preventing layer is made of a highly heat-shrinkable material coated with a semiconductive resin. It is formed by winding a corona-preventing tape or sheet formed by laminating a laminated mica insulating member made of the same laminated mica and epoxy resin composition as the laminated mica constituting the laminated mica tape on one side of the molecular fiber material. The configuration is as follows.
[0014]
In the stator coil of the rotating electrical machine according to the second aspect of the present invention, since the heat-shrinkable polymer fiber material and the laminated mica insulating member are integrated, the familiarity with the coil insulating layer made of the same laminated mica is good. In addition, there is no unimpregnated or slipped-out portion of the impregnating resin between the interface between the corona-preventing material and the insulating layer or the overlapping portion of the corona-preventing material, and there is no peeling or void after impregnation and curing. Therefore, the coil insulating layer is not damaged by the deterioration of the dielectric characteristics of the stator coil insulation or the long-term operation of the rotating electric machine due to thermal degradation, thermal contraction, electromagnetic vibration, or the like, and the insulation characteristics are not lowered.
[0018]
According to a third aspect of the present invention, there is provided a corona-preventing layer on the surface of an insulating layer formed by multiple winding of an unimpregnated laminated mica tape on a bundle of strands on which an insulating coating has been applied. In a stator coil of a rotating electrical machine, which is immersed in a thermosetting resin together with an iron core, heat-cured after vacuum pressure impregnation treatment, the corona-preventing layer is coated with a semiconductive silicone rubber on an inorganic fiber material A corona-preventing tape or sheet comprising a laminated mica insulating member composed of the same laminated mica and epoxy resin composition as the laminated mica constituting the laminated mica tape is wound on one side of a semiconductive inorganic fiber material. The structure is formed.
[0019]
In the stator coil of the rotating electrical machine according to the third aspect of the present invention, the laminated mica insulating member having good impregnation and resin retention is integrated with the semiconductive inorganic fiber material in which the semiconductive silicone rubber is applied to the inorganic fiber material. because it is of no outflow of the impregnating resin from the inorganic fibrous material, familiar with the same assembly Mai mosquitoes or we made a coil insulating layer and the stator core slot is good, and the corona preventing material as escape prevention of impregnating resin In addition, it is not necessary to wind a film having heat shrinkability around the outer peripheral portion of the insulating layer surface. In addition, since the laminated mica insulating member with good impregnation property is disposed between the insulating layer surface or the overlapping portions of the corona preventing material, the impregnating resin is not formed between the corona preventing material and the insulating layer or between the overlapping portions of the corona preventing material. There is no impregnation or drop-out part, and no peeling or voiding occurs after impregnation / curing. Therefore, the coil insulation layer is not damaged by the deterioration of the dielectric characteristics of the stator coil insulation or the long-term operation of the rotating electric machine due to the effects of thermal degradation, thermal contraction, electromagnetic vibration, etc. .
[0020]
According to a fourth aspect of the invention, the inorganic fiber material is a woven or non-woven fabric of glass or alumina.
According to invention of Claim 4 , the stator coil of the rotary electric machine provided with the corona prevention layer excellent in heat resistance can be provided.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the stator coil of the rotating electrical machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. That is, as shown in FIG. 1, a stator coil 3 of a rotating electrical machine is made of a laminated mica, a glass woven fabric, and a polymer film on a strand conductor 1 formed by bundling a plurality of strands with insulation coating. The coil insulation layer 2 is formed by winding the unimpregnated mica sheet or tape a plurality of times, and then the whole is vacuum-dried and accommodated in the stator core slot 4 and the stator core 5 together with the void portion of the insulating structure A non-solvent impregnated resin such as epoxy is impregnated with vacuum and pressure and then heated and cured. At this time, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is arranged in FIG. As shown in the figure, a corona-preventing tape comprising a laminated mica insulating member 9 made of laminated mica and an epoxy resin composition on the opposite surface of the heat-shrinkable polymer film 8 coated with the semiconductive resin 7 Or it is set as the structure which wound the sheet | seat and formed the corona prevention layer 6. FIG.
[0022]
The heat-shrinkable polymer film 8 to which the semiconductive resin 7 is applied is obtained by blending carbon powder into an epoxy resin, applying the polymer film to a heat-shrinkable polyester, polyethylene, polypropylene, or other polymer film and curing it. It was also a sexual film. Here, a semiconductive film tape made of polyester (for example, D16 semiconductive film manufactured by Nikkan Kogyo) was used.
[0023]
Further, from the viewpoint of compatibility with the coil insulating layer 2, the same laminated mica material as the coil insulating layer 2 is used for the laminated mica insulating member 9, and it is bonded to one side of the polyester semiconductive film tape to prevent corona. Made a tape.
[0024]
The corona prevention tape thus obtained was compared with two conventional corona prevention tapes (Comparative Examples 1 and 2). That is, uninsulated laminated mica tape was wound around a 10 mm × 50 mm × 800 mm square aluminum bar by ½ wrapping so as to have the same insulation thickness. Each anti-corona tape is halved and wound once in the center of the insulation range 300 mm length, and a simulated slot is formed by applying an iron plate on the tape, and a vacuum is applied using a solvent-free epibis epoxy resin. After the pressure impregnation treatment, each coil was obtained by heating and curing. Next, voltage-tan δ characteristics were tested as dielectric characteristics of the obtained coils. As a result, as shown in FIG. 7, the voltage-tan δ characteristic in the first embodiment was lower than those in Comparative Examples 1 and 2.
[0025]
As described above, the corona-preventing tape or sheet according to the present embodiment is integrated with the coil insulating layer 2 made of the same laminated mica because the laminated mica insulating member 9 is integrated with the heat-shrinkable polymer film 8. Since the laminated mica insulating member with good impregnation property is arranged between the overlapping parts of the anticorona tape or sheet, the interface between the anticorona tape or sheet and the insulating layer or the layer where the anticorona tape or sheet overlaps. Further, it is possible to prevent the occurrence of peeling and voids due to non-impregnation of the impregnated resin or falling off of the resin. Therefore, the coil insulating layer 2 is not damaged by the deterioration of the dielectric characteristics of the coil insulating layer 2, the thermal deterioration during the long-term operation of the rotating electrical machine, the heat shrinkage, the electromagnetic vibration, etc., and the insulating characteristics are not lowered. .
[0026]
Next, a second embodiment of the present invention will be described. In this embodiment, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is shown in FIG. As shown in FIG. 3, a corona prevention layer 6 is formed by winding a corona prevention tape or sheet coated with semiconductive silicone rubber 10a, 10b on both surfaces of a heat-shrinkable polymer film 8.
[0027]
Here, for example, XE16-610 made by GE Toshiba Silicones is used as the semiconductive silicone rubber 10a, 10b, and is applied to both sides of the heat-shrinkable polymer film 8 (for example, Toray shrinkable mirror tape) and cured to corona. Produced a prevention tape.
[0028]
In order to investigate the performance of the corona-preventing tape thus obtained, the above-mentioned Comparative Examples 1 and 2 were wound by winding a non-impregnated laminated mica tape on a 10 mm × 50 mm × 800 mm square aluminum bar in half lap winding. The insulation thickness was the same. The corona-preventive tape of this embodiment is halved and wound once on the length of 300 mm in the center of the insulation range, and a simulated slot is formed by applying an iron plate thereon, and a solvent-free epibis epoxy resin is used. After the vacuum pressure impregnation treatment, the coil was obtained by heating and curing. Next, a voltage-tan δ characteristic was tested as a dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the voltage −tan δ was lower than those of Comparative Examples 1 and 2 obtained in the first embodiment.
[0029]
As described above, the corona-preventing tape or sheet according to the present embodiment has the coil insulating layer 2 because the semiconductive silicone rubbers 10a and 10b, which are elastic bodies, are provided on both surfaces of the heat-shrinkable polymer film 8. Familiarity with the surface and the surface of the stator core slot 4 is good, and the silicone rubbers 10a and 10b having unevenness as compared with the surface of the flat polymer film 8 are disposed between the overlapping portions of the corona prevention tape or sheet. It is possible to prevent exfoliation or void generation due to the impregnation resin not being impregnated or dropping out of the interface between the corona prevention layer 6 and the coil insulating layer 2 or between overlapping portions of the corona prevention tape or sheet. Therefore, the coil insulating layer 2 is not damaged by the deterioration of the dielectric characteristics of the coil insulating layer 2, the thermal deterioration during the long-term operation of the rotating electrical machine, the heat shrinkage, the electromagnetic vibration, etc., and the insulating characteristics are not lowered. .
[0030]
Next, a third embodiment of the present invention will be described.
In this embodiment, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is provided. As shown in FIG. 4, one side of a semiconductive polymer fiber material 11 using any one of a woven fabric and a non-woven fabric made of organic fibers such as heat-shrinkable polyester, polyethylene, and polypropylene coated with a semiconductive resin. In addition, a corona-preventing layer 6 is formed by winding a corona-preventing tape or sheet that is formed by laminating a laminated mica insulating member 9 made of laminated mica and an epoxy resin composition.
[0031]
As the heat-shrinkable semiconductive polymer fiber material 11 to which the semiconductive resin is applied, carbon powder is blended with an epoxy resin and applied to a polymer fiber material such as polyester, polyethylene, or polypropylene having heat shrinkability. And cured. Here, a polyester fiber woven fabric (for example, Teijin Tetoron cloth tape) was used as the polymer fiber material. Further, from the viewpoint of compatibility with the coil insulating layer 2, the laminated mica insulating member 9 was made of the same laminated mica material as the coil insulating layer 2, and was bonded to one side of the polyester cloth tape to produce a corona prevention tape.
[0032]
In order to investigate the characteristics of the corona-preventing tape thus obtained, the above-mentioned Comparative Examples 1 and 2 were wound by winding an unimpregnated laminated mica tape on a 10 mm × 50 mm × 800 mm aluminum square bar by 1/2 lap winding. The insulation thickness was the same. The corona-preventive tape of this embodiment is halved and wound once on the length of 300 mm in the center of the insulation range, and a simulated slot is formed by applying an iron plate thereon, and a solvent-free epibis epoxy resin is applied. After using the vacuum pressure impregnation treatment, it was cured by heating to obtain a coil. Next, a voltage-tan δ characteristic was tested as a dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the -tan δ characteristics were lower than those of Comparative Examples 1 and 2 obtained in the first embodiment.
[0033]
Thus, in the corona-preventing tape or sheet according to the present embodiment, since the heat-shrinkable semiconductive polymer fiber 11 and the laminated mica insulating member 9 are integrated, the coil insulating layer 2 made of the same laminated mica is used. As the laminated mica insulation member with good impregnation property is arranged between the overlapping parts of the corona prevention material, it is impregnated between the interface between the corona prevention material and the insulating layer 2 or between the layers where the corona prevention material overlaps. It is possible to prevent exfoliation and void generation due to unimpregnation of the resin or falling off of the resin. Therefore, the coil insulating layer 2 is not damaged by the deterioration of the dielectric characteristics of the coil insulating layer 2, the thermal deterioration during the long-term operation of the rotating electrical machine, the heat shrinkage, and the electromagnetic vibration, and the insulating characteristics are not deteriorated.
[0034]
Next, a fourth embodiment of the present invention will be described.
In this embodiment, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is provided. As shown in FIG. 5, a laminated mica insulating member 9 made of laminated mica and an epoxy resin composition is bonded to one side of a semiconductive inorganic fiber material 12 in which a semiconductive silicone rubber is applied to an inorganic fiber material. It is set as the structure which wound the comprised corona prevention tape or sheet | seat, and formed the corona prevention layer 6. FIG.
[0035]
Here, alumina fiber tape (for example, Altex made by Sumitomo Chemical Co., Ltd.) is used as the inorganic fiber material, and semiconductive silicone rubber (for example, XE16-610 made by GE Toshiba Silicone) is applied to form the semiconductive inorganic fiber material. 12 was obtained. Further, from the viewpoint of compatibility with the coil insulating layer 2, the same laminated mica material as the coil insulating layer 2 is used for the laminated mica insulating member 9, and is bonded to one side of the semiconductive inorganic fiber material 12 to prevent corona. Made a tape.
[0036]
In order to investigate the characteristics of the corona-preventing tape thus obtained, the above-mentioned Comparative Examples 1 and 2 were wound by winding an unimpregnated laminated mica tape on a 10 mm × 50 mm × 800 mm aluminum square bar by 1/2 lap winding. The insulation thickness was the same. The corona-preventive tape of this embodiment is halved and wound once on the length of 300 mm in the center of the insulation range, and a simulated slot is formed by applying an iron plate thereon, and a solvent-free epibis epoxy resin is applied. The coil was obtained by heat-curing after using the vacuum pressure impregnation treatment. Next, a voltage-tan δ characteristic was tested as a dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the -tan δ characteristics were lower than those of Comparative Examples 1 and 2 obtained in the first embodiment.
[0037]
Thus, the corona-preventing tape or sheet according to the present embodiment is a laminated mica insulating member having good impregnation and resin retention on the semiconductive inorganic fiber material 12 in which the semiconductive silicone rubber is applied to the inorganic fiber material. Since 9 is integrated, the impregnating resin does not flow out from the semiconductive inorganic fiber material 12, and the coil insulation layer 2 and the stator core slot 4 made of the same laminated mica are also familiar. Therefore, it is not necessary to wind a film having heat shrinkability around the outer peripheral portion of the surface of the insulating layer 2 in addition to the anti-rona material to prevent the impregnating resin from flowing out. In addition, since the laminated mica insulating member 9 having good impregnation property is disposed between the overlapping portions of the corona preventing material, the impregnating resin is interposed between the interface between the corona preventing layer 6 and the insulating layer 2 or between the layers where the corona preventing material overlaps. It is possible to prevent the occurrence of peeling and voids due to non-impregnation or resin falling off. Therefore, the coil insulating layer 2 is not damaged by the deterioration of the dielectric properties of the coil insulating layer 2 or the long-term operation of the rotating electrical machine, such as thermal deterioration, thermal contraction, and electromagnetic vibration, and the insulating properties are not deteriorated. .
[0038]
Next, a fifth embodiment of the present invention will be described.
In this embodiment, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the outer periphery of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is provided. As shown in FIG. 6, a corona-preventing tape or sheet comprising a metal-plated polymer fiber material 13 using any one of a woven fabric and a non-woven fabric comprising a metal-plated heat-shrinkable polyester, polyethylene, polypropylene, or the like. Are wound to form the corona prevention layer 6.
[0039]
Here, a metal plating molecular fiber 13 (for example, Tetron / Cu—Ni plating cloth manufactured by Daiwa Boseki Co., Ltd.) obtained by plating a polyester woven fabric with copper and nickel was used as a corona prevention tape. In order to investigate the characteristics of this corona-preventing tape, an insulating thickness is the same as in Comparative Examples 1 and 2 by winding a non-impregnated laminated mica tape with a 1/2 lap winding around a 10 mm × 50 mm × 800 mm square bar. Formed as follows. The corona-preventive tape of this embodiment is halved and wound once on the length of 300 mm in the center of the insulation range, and a simulated slot is formed by applying an iron plate thereon, and a solvent-free epibis epoxy resin is applied. After using the vacuum pressure impregnation treatment, it was cured by heating to obtain a coil. Next, a voltage-tan δ characteristic was tested as a dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the voltage-tan δ characteristics were lower than those of Comparative Examples 1 and 2 obtained in the first embodiment.
[0040]
Thus, since the surface of the heat-shrinkable polymer fiber material 13 is plated with metal, the corona-preventing tape or sheet in the present embodiment is conductive and has good impregnation properties, and the impregnated resin is heat-cured. since thermal contraction when there is no outflow of the impregnating resin from polymer fiber material 13, also familiar with the coil insulating layer 2 and the stator core slot 4 made of current formed mica well, the impregnating resin non-impregnated or resin It is possible to prevent exfoliation and voids due to falling off. Therefore, the coil insulating layer 2 is not damaged by the deterioration of the dielectric characteristics of the coil insulating layer 2 or the long-term operation of the rotating electrical machine, such as thermal deterioration, thermal contraction, and electromagnetic vibration, and the insulating characteristics are not deteriorated. .
[0041]
【The invention's effect】
According to the present invention, in order to prevent the impregnating resin from falling off, it is not necessary to wind a heat-shrinkable film or the like on the surface of the coil insulation layer separately from the corona prevention material. There is no exfoliation or voiding due to the impregnation resin not being impregnated or falling out of the resin at the interface between the layer and the coil insulation layer or in the corona prevention layer, due to a decrease in the dielectric characteristics of the stator coil insulation or long-term operation of the rotating electrical machine It is possible to provide a stator coil for a rotating electrical machine in which a coil insulating layer is not damaged due to thermal deterioration, thermal contraction, electromagnetic vibration, or the like, thereby causing deterioration of insulating characteristics.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a stator coil of a rotating electric machine according to a prior art and an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of a corona prevention tape or sheet used for the stator coil of the rotating electrical machine according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a configuration of a corona prevention tape or sheet used for a stator coil of a rotating electric machine according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a configuration of a corona prevention tape or sheet used for a stator coil of a rotating electric machine according to a third embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a corona prevention tape or sheet used for a stator coil of a rotating electric machine according to a fourth embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a configuration of a corona prevention tape or sheet used for a stator coil of a rotating electric machine according to a fifth embodiment of the present invention.
FIG. 7 is a curve diagram showing voltage-tan δ characteristics of coil insulation in the first to fifth embodiments of the present invention and Comparative Examples 1 and 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wire conductor, 2 ... Coil insulation layer, 3 ... Stator coil, 4 ... Stator core slot, 5 ... Stator core, 6 ... Corona prevention layer, 7 ... Semiconductive resin, 8 ... Glue mica insulation member , 9 ... laminated mica insulating member, 10a, 10b ... semiconductive silicone rubber, 11 ... semiconductive polymer fiber material, 12 ... semiconductive inorganic fiber material, 13 ... metal plated polymer fiber material.

Claims (4)

  A corona-preventing layer is provided on the surface of the insulating layer formed by multiple winding of unimpregnated laminated mica tape on a wire bundle with insulation coating, and after being stored and connected to the stator core, in the thermosetting resin In the stator coil of a rotating electrical machine, which is immersed in a vacuum pressure impregnation treatment and then cured by heating, the corona prevention layer is formed on the opposite surface of the heat-shrinkable polymer film coated with a semiconductive resin. Rotation characterized in that it is formed by winding a corona-preventing tape or sheet formed by laminating laminated mica insulating members composed of the same laminated mica and epoxy resin composition as the laminated mica constituting the laminated mica tape Electric stator coil.   A corona prevention layer is provided on the surface of an insulating layer formed by multiple winding of unimpregnated laminated mica tape on a wire bundle with insulation coating, and after being stored and connected to the stator core, in the thermosetting resin together with the stator core In a stator coil of a rotating electrical machine that is immersed in a vacuum pressure impregnation treatment and then heat-cured, the corona prevention layer is formed on one side of a heat-shrinkable polymer fiber material coated with a semiconductive resin. Rotation characterized in that it is formed by winding a corona-preventing tape or sheet formed by laminating laminated mica insulating members composed of the same laminated mica and epoxy resin composition as the laminated mica constituting the laminated mica tape Electric stator coil.   A corona-preventing layer is provided on the surface of the insulating layer formed by multiple winding of unimpregnated laminated mica tape on a wire bundle with insulation coating, and after being stored and connected to the stator core, in the thermosetting resin In a stator coil of a rotating electrical machine that is immersed in a vacuum pressure impregnation treatment and then heat-cured, the corona prevention layer is made of a semiconductive inorganic fiber material in which a semiconductive silicone rubber is applied to an inorganic fiber material. It is formed by winding a corona-preventing tape or sheet comprising a laminated mica insulating member composed of the same laminated mica and epoxy resin composition as the laminated mica constituting the laminated mica tape on one side. The stator coil of the rotating electrical machine. The stator coil of a rotating electric machine according to claim 3 , wherein the inorganic fiber material is a woven or non-woven fabric of glass or alumina.

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