JP2003259589A - Stator coil of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator coil of a rotary electric machine that does not cause the occurrence of exfoliation or void caused by the unimpregnation or falling-off of impregnating resin that may occur in a usual corona-preventive material, and does not cause the degradation of dielectric characteristics in insulating the stator coil, the thermal degradation due to the long time operation of the rotary electric machine, and the degradation of insulation characteristics due to thermal shrinkage, electromagnetic vibration and the like. <P>SOLUTION: The stator coil of the rotary electric machine is formed such that a corona-preventive layer is formed on the surface of an insulating layer formed by multi-winding an assembled unimpregnated mica tape onto a bundle of element wires to which insulating coating is applied, the preventive layer is wire-connected to a stator core for being accommodated, then, the preventive layer is impregnated in thermally curing resin together with the stator core, and the preventive layer is subject to vacuum-pressure impregnation treatment and heat-cured. The corona- preventive layer is formed by winding a corona-preventive tape or sheet constituted by bonding an assemble mica insulating member 9, which is composed of assembled mica and an epoxy resin compound, to the opposite face of a polymer film 8 having thermal shrink characteristics on which semiconductive resin 7 is applied. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator coil provided in a rotating electric machine such as an electric motor or a generator,
The present invention relates to a stator coil of a rotary electric machine that is insulation-treated by pressure impregnation.

[0002]

2. Description of the Related Art Conventionally, as a stator coil of a rotary electric machine of this type, as shown in FIG. 1, a mica sheet or a mica sheet is formed on a wire conductor 1 formed by bundling a plurality of wires covered with an insulating coating. After the mica tape is wound a plurality of times to form the stator coil 3 having the coil insulating layer 2, the whole is vacuum-dried and the stator coil 3 is housed in the stator core slot 4 and connected, and the stator core 5 is insulated. There is a total impregnation method in which voids of a tissue are impregnated with a solventless impregnating resin such as epoxy under vacuum and pressure, and then heat-cured.

In this case, in the stator coil 3, in order to prevent the occurrence of partial discharge between the stator coil 3 and the stator core slot 4, the surface of the coil insulating layer 2 in the same range as the length of the stator core slot is prevented. A glass fiber tape or sheet which is impregnated with a resin containing a conductive filler such as carbon powder and cured on the outer peripheral portion, or a tape or sheet which is cured by applying the resin on one or both sides of a polymer film. The corona preventive layer 6 is formed by winding a corona preventive material or the like.

[0004]

However, conventional corona preventive materials such as glass fiber tapes are inferior in resin retention and heat shrinkability when impregnated with an impregnating resin and cured.
Inside the coil insulation layer 2 or the corona prevention layer 6 and the coil insulation layer 2
Peeling or voids may be generated at the interface with and due to the impregnated resin falling off. The peeling and the voids cause the dielectric characteristics of the coil insulating layer 2 to be deteriorated. Therefore, in order to prevent the impregnated resin from falling off, a film having heat shrinkability is wound around the surface of the coil insulating layer 2 in addition to the corona preventive material. I am turning.

The conventional corona preventive material using a heat-shrinkable polymer film is wound around the surface of the coil insulating layer 2 with a certain portion overlapped. At this time, wrinkles are partially generated in the film, but the films are closely attached to each other in the wrinkle-free overlapping portion. Since the overlapping portion where the films are in close contact with each other is further in contact during vacuum / pressure impregnation, infiltration of the impregnating resin from the corona preventive layer 6 is hindered, and the interface between the corona preventive layer 6 and the coil insulating layer 2 and the corona preventive material are prevented. The impregnated resin may not be impregnated or fallen out between the overlapping portions, and peeling or voids may occur after impregnation / curing.

As described above, the peeling or void is a factor that deteriorates the dielectric characteristics of the coil insulating layer 2, and the peeling or void gradually expands due to heat deterioration or heat shrinkage during the operation of the rotating electric machine. The partial discharge increases, and the heat of partial discharge may cause the corona prevention layer 6 to be gradually damaged.

Since the defective portion is not electrically connected to the stator core 5 and does not have a copper potential, slot discharge occurs in the stator coil 3 and the stator core 5. Further, there is a possibility that the defective portion is enlarged due to electromagnetic vibration during long-term operation and the coil insulating layer 2 is eventually damaged, resulting in deterioration of the insulating characteristic.

Therefore, in the present invention, in order to prevent the impregnated resin from falling off, it is not necessary to wind a film having heat shrinkability on the surface of the coil insulating layer in addition to the corona preventive material. There is no peeling or voids at the interface between the corona prevention layer and the coil insulation layer or in the corona prevention layer due to the impregnation of the impregnated resin or the resin falling off, and the deterioration of the dielectric properties of the stator coil insulation or the long-term An object of the present invention is to provide a stator coil for a rotating electric machine, which does not cause damage to the coil insulating layer due to heat deterioration, heat contraction, electromagnetic vibration, etc. due to operation, resulting in deterioration of insulation characteristics.

[0009]

In order to achieve the above object, the invention of claim 1 is the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on an element-coated wire bundle. In the stator coil of the rotating electric machine, which is formed by providing a corona prevention layer on the stator core, connecting the stator core, immersing it in a thermosetting resin together with the stator core, impregnating it under vacuum pressure, and then heat curing it. The preventive layer is a corona preventive tape or sheet which is formed by sticking an assembled mica insulating member composed of an assembled mica and an epoxy resin composition to the opposite surface of a heat-shrinkable polymer film coated with a semiconductive resin. The structure is formed by winding.

In the stator coil of the rotating electric machine according to the first aspect of the present invention, since the heat-shrinkable polymer film and the integrated mica insulating member are integrated, the familiarity with the coil insulating layer made of the same integrated mica is obtained. Well, since the mica insulating member with good impregnation property is placed between the overlapping parts of the corona preventive material, the impregnated resin may not be impregnated or fallen off at the interface between the corona preventive layer and the insulating layer or between the overlapping parts of the corona preventive material. There is no peeling or void after impregnation / curing. Therefore,
Due to the deterioration of the dielectric properties of the stator coil insulation and the effects of heat deterioration, heat contraction and electromagnetic vibration during long-term operation of the rotating electrical machine,
The coil insulating layer is not damaged and the insulation characteristics are not deteriorated.

According to a second aspect of the present invention, a corona preventive layer is provided on the surface of an insulating layer formed by multiple winding of an unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotating electric machine, which is formed by immersing in a thermosetting resin together with the stator iron core under vacuum pressure impregnation treatment and then heat curing, the corona preventive layer is formed on both sides of a heat shrinkable polymer film. It is formed by winding a corona-preventing tape or sheet coated with semiconductive silicone rubber.

In the stator coil of the rotating electric machine according to the second aspect of the invention, since the semiconductive silicone rubber which is an elastic body is formed on both sides of the heat-shrinkable polymer film,
Familiar with the coil insulation layer surface and the stator core slot surface, the uneven silicone rubber is arranged between the overlapping portions of the corona preventive material compared to the flat film surface.
Since the corona preventive materials do not adhere to each other, the impregnated resin is not impregnated or slipped off at the interface between the corona preventive layer and the insulating layer or between the overlapping parts of the corona preventive material, and peeling or voids occur after impregnation / curing. Never. Therefore, the dielectric property of the stator coil insulation is not deteriorated, and the coil insulation layer is not damaged by the effects of heat deterioration, heat contraction, electromagnetic vibration, and the like during long-term operation of the rotating electric machine, so that the insulation property is not deteriorated.

According to a third aspect of the present invention, a corona preventive layer is provided on the surface of an insulating layer formed by multiple winding of an unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotating electric machine, which is formed by immersing in a thermosetting resin together with the stator core, vacuum pressure impregnation treatment, and then heat curing, the corona prevention layer is a polymer coated with a semiconductive resin. A corona-preventing tape or sheet formed by adhering a laminated mica insulating member composed of a laminated mica and an epoxy resin composition on one surface of a fibrous material is wound and formed.

In the stator coil of the rotating electric machine according to the third aspect of the invention, since the heat-shrinkable polymer fiber material and the mica insulating member are integrated, a coil insulating layer made of the same mica is used. Familiarity is good, and there is no impregnation or drop-out of impregnated resin between the interface between the corona preventive material and the insulating layer or between the overlapping parts of the corona preventive material, and no peeling or voids occur after impregnation / curing. Therefore, the dielectric property of the stator coil insulation is not deteriorated, and the coil insulation layer is not damaged by the effects of heat deterioration, heat contraction, electromagnetic vibration, and the like during long-term operation of the rotating electric machine, so that the insulation property is not deteriorated.

According to a fourth aspect of the present invention, a corona preventive layer is provided on the surface of an insulating layer formed by multiple winding of an unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotating electric machine formed by dipping in a thermosetting resin together with the stator core, vacuum pressure impregnation treatment, and then heat curing, the corona preventive layer is made of metal-plated polymer fiber material. The structure is formed by winding a corona preventive tape or sheet.

In the stator coil of the rotating electric machine according to the invention of claim 4, since the surface of the polymer fiber material is metal-plated, it is electrically conductive and has a good impregnation property, and the interface between the corona preventive material and the insulating layer is good. There is no impregnation resin impregnation or falling out between the overlapping parts of the corona preventive material and the corona preventive material, and peeling or voids do not occur after impregnation / curing. Therefore, the dielectric property of the stator coil insulation is not deteriorated, and the coil insulation layer is not damaged by the effects of heat deterioration, heat contraction, electromagnetic vibration, and the like during long-term operation of the rotating electric machine, so that the insulation property is not deteriorated.

According to a fifth aspect of the invention, in the third or fourth aspect of the invention, the polymer fiber material is a woven or non-woven fabric made of heat-shrinkable organic fibers. In the stator coil of the rotating electric machine according to the invention of claim 5, when the impregnating resin is heat-cured, the polymer fiber material is thermally shrunk, so that the interface between the corona-preventing material and the insulating layer and the overlapping portion between the corona-preventing material There is no impregnation of the impregnated resin or there is no dropout part, and there is no peeling or void formation after impregnation / curing. Therefore, the dielectric property of the stator coil insulation is not deteriorated, and the coil insulation layer is not damaged by the effects of heat deterioration, heat contraction, electromagnetic vibration, and the like during long-term operation of the rotating electric machine, so that the insulation property is not deteriorated.

According to a sixth aspect of the present invention, a corona preventive layer is provided on the surface of an insulating layer formed by multiple winding of an unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotating electric machine formed by immersing in a thermosetting resin together with the stator iron core, vacuum pressure impregnation treatment, and then heat curing, the corona preventive layer comprises an inorganic fiber material made of semiconductive silicone rubber. It is formed by winding a corona preventive tape or sheet formed by bonding an insulating mica insulating member composed of an assembled mica and an epoxy resin composition on one surface of the applied semiconductive inorganic fiber material.

In the stator coil of the rotating electric machine according to the sixth aspect of the present invention, the semiconductive inorganic fiber material obtained by applying the semiconductive silicone rubber to the inorganic fiber material is incorporated into the mica insulation having good impregnation property and resin retention property. Because the members are integrated,
There is no outflow of impregnated resin from the inorganic fiber material, and it is well compatible with the coil insulation layer and stator core slot made of the same laminated mycal. Need not be wound around the outer periphery of the insulating layer surface. In addition, since the mica insulating member having good impregnation property is arranged between the insulating layer surface or the overlapping portion of the corona preventive material, the impregnated resin is not present at the interface between the corona preventing material and the insulating layer or between the overlapping portions of the corona preventive material. There is no impregnation or falling out, and no peeling or voids occur after impregnation and curing. Therefore, the dielectric properties of the stator coil insulation will not deteriorate, and the coil insulation layer will not be damaged due to the effects of heat deterioration, heat contraction, electromagnetic vibration, etc. during long-term operation of the rotating electric machine, and the insulation properties will not deteriorate. .

According to a seventh aspect of the invention, the inorganic fiber material is a woven or non-woven fabric of glass or alumina. According to the invention of claim 7, it is possible to provide a stator coil of a rotating electric machine including a corona preventive layer having excellent heat resistance.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A stator coil for a rotary electric machine according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. That is, as shown in FIG. 1, a stator coil 3 of a rotating electric machine comprises a strand conductor 1 formed by bundling a plurality of strands with an insulating coating, and forming a mica, a glass woven fabric, and a polymer film on the strand conductor 1. The uninsulated mica sheet or tape is wound a plurality of times to form the coil insulation layer 2, and then the whole is vacuum dried and housed in the stator core slot 4 and connected to the stator core 5 and the voids of the insulating structure. It is formed by vacuum-pressurizing and impregnating with a solventless impregnating resin such as epoxy resin, and then heat curing. At this time, in order to prevent the partial discharge from occurring between the stator coil 3 and the stator core slot 4, the outer peripheral portion of the surface of the coil insulating layer 2 which is approximately the same as the length of the stator core slot 4 is formed as shown in FIG. As shown in FIG. 7, a corona-preventing tape formed by bonding a mica insulating member 9 made of an assembled mica and an epoxy resin composition to the opposite surface of a heat-shrinkable polymer film 8 coated with a semiconductive resin 7. Alternatively, the sheet is wound to form the corona prevention layer 6.

For the heat-shrinkable polymer film 8 coated with the semiconductive resin 7, carbon powder is mixed with epoxy resin,
A semiconductive film is obtained by coating a polymer film having heat shrinkability such as polyester, polyethylene, polypropylene, etc. and curing it. Here, a semiconductive film tape made of polyester (for example, D16 semiconductive film manufactured by Nikkan Kogyo Co., Ltd.) was used.

From the viewpoint of compatibility with the coil insulating layer 2, the same mica insulating material as the coil insulating layer 2 is used for the mica insulating member 9 and is attached to one surface of the polyester semiconductive film tape. I made a corona prevention tape.

The corona-preventing tape thus obtained and two conventional corona-preventing tapes (Comparative Examples 1 and 2) were compared and tested. That is, 10 mm x 50 mm x 800
A non-impregnated laminated mica tape was wound around an aluminum square rod of mm by ½ lap winding to form the same insulation thickness. Each corona-preventing tape is wound 1/2 times over the length of 300 mm in the center of the insulating area and wound once, and a steel plate is further applied to form a simulated slot, which is vacuum-applied using a solvent-free epibis epoxy resin. After the pressure impregnation treatment, heat curing was performed to obtain each coil. Next, the voltage-tan δ characteristic was tested as the dielectric characteristic of each obtained coil. As a result, as shown in FIG. 7, the voltage-tan δ characteristic of the first embodiment was lower than that of Comparative Examples 1 and 2.

As described above, in the corona-preventing tape or sheet according to the present embodiment, since the heat-shrinkable polymer film 8 and the integrated mica insulating member 9 are integrated, the coil insulating layer 2 made of the same integrated mica is used. The mica insulating member with good impregnation property is placed between the overlapping parts of the corona prevention tape or sheet, so that the interface between the corona prevention tape or sheet and the insulating layer or the corona prevention tape or sheet overlaps. It is possible to prevent peeling and voids due to the impregnation of the impregnated resin or the falling of the resin between the layers. Therefore, the coil insulating layer 2 will not be damaged due to the deterioration of the dielectric characteristics of the coil insulating layer 2, the heat deterioration during long-term operation of the rotating electric machine, the heat shrinkage, the electromagnetic vibration, and the like, and the insulation characteristics will not be deteriorated. .

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 peripheral portion of the surface of the coil insulating layer 2 in the same range as the length of the stator core slot 4 is As shown in FIG. 3, the semiconducting silicone rubbers 10a, 10 are provided on both sides of the heat-shrinkable polymer film 8.
The corona preventive tape or sheet coated with b is wound to form the corona preventive layer 6.

Here, the semiconductive silicone rubber 10 is used.
a and 10b are, for example, GE Toshiba Silicone XE1
6-610 was applied to both sides of a heat-shrinkable polymer film 8 (for example, Toray's shrinkable lumirror tape) and cured to prepare a corona preventive tape.

In order to investigate the performance of the thus-obtained anticorona tape, 10 mm × 50 mm × 800 m
An unimpregnated laminated mica tape was wound around an aluminum square rod of m by ½ lap winding so as to have the same insulation thickness as in Comparative Examples 1 and 2. The central part 300 of the insulation range
The corona-preventing tape of the present embodiment is 1 / 2-lapped to a length of mm and wound once, and an iron plate is further applied to form a simulated slot, and vacuum pressure impregnation treatment is performed using a solvent-free epibis epoxy resin. Then, it was heat-cured to obtain a coil. Next, the voltage-tan delta characteristic was tested as the dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the voltage −tan δ was lower than that of Comparative Examples 1 and 2 obtained in the first embodiment.

As described above, in the corona-preventing tape or sheet according to the present embodiment, since the semiconductive silicone rubbers 10a and 10b, which are elastic bodies, are provided on both sides of the heat-shrinkable polymer film 8, the coil is prevented. Silicone rubbers 10a and 10b, which have good conformity to the surface of the insulating layer 2 and the surface of the stator core slot 4 and are more uneven than the surface of the flat polymer film 8, are arranged between the overlapping portions of the corona preventive tape or sheet. Therefore, it is possible to prevent peeling or voids due to the impregnation of the impregnated resin or the falling of the resin at the interface between the corona prevention layer 6 and the coil insulating layer 2 or between the overlapping portions of the corona prevention tape or sheet. Therefore, the coil insulating layer 2 will not be damaged due to the deterioration of the dielectric characteristics of the coil insulating layer 2, the heat deterioration during long-term operation of the rotating electric machine, the heat shrinkage, the electromagnetic vibration, and the like, and the insulation characteristics will not be deteriorated. .

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 coil insulating layer 2 having a length substantially the same as the length of the stator core slot 4 is prevented.
As shown in FIG. 4, the outer peripheral portion of the surface is made of a semiconductive high-conductivity material using a woven or non-woven fabric made of organic fibers such as heat-shrinkable polyester, polyethylene, or polypropylene coated with a semiconductive resin. The corona prevention layer 6 is formed by winding a corona prevention tape or sheet, which is formed by adhering a mica insulation member 9 made of an assembled mica and an epoxy resin composition, on one surface of the molecular fiber material 11. .

As the heat-shrinkable, semi-conductive polymer fiber material 11 coated with a semi-conductive resin, carbon powder is mixed with an epoxy resin, and a polymer fiber having heat-shrinkability such as polyester, polyethylene or polypropylene is used. It is applied to a material and cured. Here, a polyester fiber woven cloth (for example, Tetron cloth tape manufactured by Teijin) was used as the polymer fiber material. Also, from the viewpoint of compatibility with the coil insulating layer 2, the same mica insulating material as the coil insulating layer 2 was used for the laminated mica insulating member 9, and it was bonded to one surface of the polyester cloth tape to manufacture a corona preventive tape.

In order to investigate the characteristics of the thus-obtained anti-corona tape, 10 mm × 50 mm × 800 m
An unimpregnated laminated mica tape was wound around an aluminum square rod of m by ½ lap winding so as to have the same insulation thickness as in Comparative Examples 1 and 2. The central part 300 of the insulation range
The corona-preventing tape according to the present embodiment is 1 / 2-overlapped to a length of mm and wound once, and an iron plate is further applied to form a simulated slot, and vacuum pressure impregnation is performed using a solvent-free epibis epoxy resin. After the treatment, heat curing was performed to obtain a coil. next,
The voltage-tan delta characteristic was tested as the dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the −tan δ characteristic was lower than that of Comparative Examples 1 and 2 obtained in the first embodiment.

As described above, in the corona-preventing tape or sheet according to the present embodiment, since the heat-shrinkable semiconductive polymer fiber 11 and the mica insulating member 9 are integrated, the coil composed of the same mica is used. Since the mica insulating member having a good impregnation property is arranged between the overlapping portions of the corona preventing material and the corona preventing material, the interface between the corona preventing material and the insulating layer 2 or the layer where the corona preventing material overlaps In addition, it is possible to prevent peeling and voids due to non-impregnation of the impregnated resin or dropping of the resin. Therefore, the coil insulating layer 2 will not be damaged due to the deterioration of the dielectric characteristics of the coil insulating layer 2, the heat deterioration during the long-term operation of the rotating electric machine, the heat contraction, the electromagnetic vibration, and the like, and the insulation characteristics will not be deteriorated.

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 coil insulating layer 2 having a length substantially the same as the length of the stator core slot 4 is prevented.
As shown in FIG. 5, on the outer peripheral portion of the surface, a semiconductive inorganic fiber material 1 in which semiconductive silicone rubber is applied to the inorganic fiber material 1
On one side of No. 2, a corona-preventing tape or sheet formed by adhering a laminated mica insulating member 9 made of laminated mica and an epoxy resin composition is wound to form a corona-preventing layer 6.

In this case, an alumina fiber tape (for example, ALTEX manufactured by Sumitomo Chemical Co., Ltd.) is used for the inorganic fiber material, and a semiconductive silicone rubber (for example, XE16-610 manufactured by GE Toshiba Silicone) is applied to the inorganic fiber material to make it semiconductive. Inorganic fiber material 1
Got 2. Further, from the viewpoint of compatibility with the coil insulating layer 2, the same mica insulating material as the coil insulating layer 2 is used for the laminated mica insulating member 9 and is bonded to one surface of the semiconductive inorganic fiber material 12 to prevent corona. I made a tape.

In order to investigate the characteristics of the thus-obtained anti-corona tape, 10 mm × 50 mm × 800 m
An unimpregnated laminated mica tape was wound around an aluminum square rod of m by ½ lap winding so as to have the same insulation thickness as in Comparative Examples 1 and 2. The central part 300 of the insulation range
The corona-preventing tape according to the present embodiment is 1 / 2-overlapped to a length of mm and wound once, and an iron plate is further applied to form a simulated slot, and vacuum pressure impregnation is performed using a solvent-free epibis epoxy resin. After the treatment, heat curing was performed to obtain a coil. next,
The voltage-tan delta characteristic was tested as the dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the −tan δ characteristic was lower than that of Comparative Examples 1 and 2 obtained in the first embodiment.

As described above, the corona-preventing tape or sheet according to the present embodiment is composed of the semiconductive inorganic fiber material 12 in which the semiconductive silicone rubber is applied to the inorganic fiber material, which has good impregnation property and resin retention property. Since the mica insulating member 9 is integrated, the impregnating resin does not flow out from the semi-conductive inorganic fiber material 12, and the coil insulating layer 2 and the stator core slot 4 made of the same mica are compatible.
Therefore, in order to prevent the impregnated resin from flowing out, it is not necessary to wind a heat-shrinkable film or the like on the outer peripheral portion of the surface of the insulating layer 2 in addition to the rona preventing material. Further, since the laminated mica insulating member 9 having a good impregnation property is disposed between the overlapping portions of the corona preventive material, the impregnated resin is not provided at the interface between the corona preventive layer 6 and the insulating layer 2 or between the layers where the corona preventive material overlaps. It is possible to prevent peeling and voids due to non-impregnation or dropping of the resin. Therefore, there is no possibility that the coil insulating layer 2 is damaged and deteriorates due to the deterioration of the dielectric characteristics of the coil insulating layer 2 or the effects of heat deterioration, thermal contraction, electromagnetic vibration, and the like during long-term operation of the rotating electric machine. .

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 coil insulating layer 2 having a length substantially the same as the length of the stator core slot 4 is prevented.
As shown in FIG. 6, on the outer periphery of the surface, from metal-plated polymer fiber material 13 using either woven or non-woven fabric made of metal-plated heat-shrinkable polyester, polyethylene, polypropylene or other organic fiber The corona preventive tape or sheet is wound to form the corona preventive layer 6.

Here, metal-plated molecular fibers 13 (for example, Tetoron / Cu-Ni plating cloth manufactured by Daiwa Spinning Co., Ltd.) obtained by plating copper and nickel on polyester woven cloth were used as a corona preventive tape. In order to investigate the characteristics of this corona-preventing tape, an unimpregnated laminated mica tape was wound around an aluminum square bar of 10 mm × 50 mm × 800 mm by 1/2 lap winding so that the insulation thickness was the same as that of Comparative Examples 1 and 2. So formed. 300 mm center of the insulation range
1/2 the length of the corona preventive tape of this embodiment 1
The coil was wound, and an iron plate was placed on the coil to form a simulated slot, which was subjected to vacuum pressure impregnation treatment using a solvent-free epibis-based epoxy resin and then cured by heating to obtain a coil. Next, the voltage-tan delta characteristic was tested as the dielectric characteristic of the obtained coil. As a result, as shown in FIG. 7, the voltage-tan δ characteristic was lower than that of Comparative Examples 1 and 2 obtained in the first embodiment.

As described above, the corona-preventing tape or sheet according to the present embodiment comprises the heat-shrinkable polymer fiber material 1.
Since the surface of 3 is plated with metal, it is conductive and has good impregnability, and heat shrinks when the impregnating resin is heated and cured, so that the impregnating resin does not flow out from the polymer fiber material 13.
The coil insulating layer 2 made of the same mica and the stator core slot 4 are also well compatible with each other, and it is possible to prevent peeling or voids due to impregnation of the impregnated resin or dropping of the resin. Therefore, the coil insulating layer 2 will not be damaged due to the deterioration of the dielectric characteristics of the coil insulating layer 2 or the effects of heat deterioration, heat contraction, electromagnetic vibration, etc. during long-term operation of the rotating electric machine, and the insulation characteristics will not be deteriorated. .

[0041]

According to the present invention, in order to prevent the impregnated resin from falling off, it is not necessary to wind a heat-shrinkable film or the like on the surface of the coil insulating layer in addition to the corona preventive material. There is no peeling or voids due to the impregnation of the impregnated resin or the falling of the resin inside the layer or at the interface between the corona prevention layer and the coil insulation layer or inside the corona prevention layer, and the dielectric properties of the stator coil insulation are reduced or the rotation is reduced. It is possible to provide a stator coil of a rotating electric machine in which the coil insulating layer is not damaged due to heat deterioration, heat contraction, electromagnetic vibration, etc. due to long-term operation of the electric machine, resulting in deterioration of the insulation characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a stator coil of a rotary electric machine of a conventional type and an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a corona preventive tape or sheet used for the stator coil of the rotating electric machine according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a configuration of a corona preventive 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 sectional view showing a configuration of a corona preventive 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 sectional view showing the configuration of a corona preventive 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 sectional view showing the configuration of a corona preventive 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 the voltage-tan δ characteristics of coil insulation of the first to fifth embodiments of the present invention and Comparative Examples 1 and 2.

[Explanation of symbols]

1 ... strand conductor, 2 ... coil insulating layer, 3 ... stator coil,
4 ... Stator core slot, 5 ... Stator core, 6 ... Corona prevention layer, 7 ... Semiconductive resin, 8 ... Integrated mica insulation member,
9 ... Insulated mica insulating member, 10a, 10b ... Semi-conductive silicone rubber, 11 ... Semi-conductive polymer fiber material, 12 ... Semi-conductive inorganic fiber material, 13 ... Metal-plated polymer fiber material.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Noriyuki Iwata             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office (72) Inventor Mikio Takahata             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office F-term (reference) 5H604 AA01 BB01 BB03 BB08 BB14                       CC01 CC05 CC14 DB02 DB26                       PB03 PD02 PD03 PD07                 5H615 AA01 BB01 BB02 BB05 BB14                       PP01 PP13 QQ03 QQ06 QQ07                       RR02 TT02 TT22 TT23 TT26                       TT31 TT34

Claims (7)

[Claims] 1. A corona preventive layer is provided on the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotary electric machine, which is formed by immersing in a thermosetting resin, vacuum pressure impregnation treatment, and then heat curing, the corona prevention layer is a heat-shrinkable polymer film coated with a semiconductive resin. A stator coil for a rotating electric machine, characterized in that it is formed by winding a corona-preventing tape or sheet, which is formed by bonding an assembled mica insulating member composed of an assembled mica and an epoxy resin composition on the opposite surface of the above. 2. A corona-preventing layer is provided on the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on a wire bundle coated with an insulating coating, and after the wiring is accommodated in the stator core, the corona-preventing layer and the stator core are connected together. In a stator coil of a rotating electric machine, which is formed by immersing in a thermosetting resin, vacuum pressure impregnation treatment, and then heating and curing, the corona preventive layer comprises semi-conductive silicone rubber on both sides of a heat-shrinkable polymer film. A stator coil for a rotating electric machine, wherein the stator coil is formed by winding a corona-preventing tape or sheet coated with. 3. A corona preventive layer is provided on the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on a wire bundle coated with an insulating coating. In a stator coil of a rotating electric machine, which is obtained by immersing in a thermosetting resin, vacuum pressure impregnation treatment, and then heat curing, the corona prevention layer is formed on one side of a polymer fiber material coated with a semiconductive resin. A stator coil for a rotating electric machine, which is formed by winding a corona-preventing tape or sheet formed by bonding laminated mica insulating members made of laminated mica and an epoxy resin composition. 4. A corona preventive layer is provided on the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on a wire bundle coated with an insulating coating, and after accommodating and connecting to a stator core, the core is joined together with the stator core. In a stator coil of a rotating electric machine, which is formed by immersing in a thermosetting resin, vacuum pressure impregnation treatment, and then heat curing, the corona prevention layer is a corona prevention tape or sheet made of metal-plated polymer fiber material. A stator coil for a rotating electric machine, wherein the stator coil is formed by winding. 5. The polymer fiber material is a woven or non-woven fabric made of a heat-shrinkable organic fiber.
Or a stator coil of a four-turn electric machine. 6. A corona-preventing layer is provided on the surface of an insulating layer formed by multiple winding unimpregnated laminated mica tape on a wire bundle coated with an insulating coating, and after the wiring is accommodated in the stator core, the corona-preventing layer is connected together with the stator core. In a stator coil of a rotating electric machine, which is formed by immersing in a thermosetting resin, vacuum pressure impregnation treatment, and then heat curing, the corona prevention layer is a semiconductive silicone rubber coated with semiconductive silicone rubber. Fixing of a rotating electric machine, characterized in that it is formed by winding a corona-preventing tape or sheet formed by bonding an integrated mica insulating member composed of an integrated mica and an epoxy resin composition on one side of a water-soluble inorganic fiber material. Child coil. 7. The stator coil for a rotating electric machine according to claim 6, wherein the inorganic fiber material is a woven or non-woven fabric of glass or alumina.