JP2007282410A - Rotating electric machine, stator coil thereof, its manufacturing method, and semiconductive sheet, semiconductive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sufficient dielectric characteristic in insulation of a coil by effectively preventing peeling and occurrence of a void in an insulating layer of an insulating coil, or an interface between the insulating layer and a corona preventing layer. <P>SOLUTION: A winding object has a strand conductor 14, the insulating layer 15 formed by winding a mica tape 16 at the outer periphery of the strand conductor 14, and the corona preventing layer 17 formed by winding a corona preventing tape 18 to an outer periphery of the insulating layer 15. The winding object is stored in a slot 8a of a stator iron core 8, and the corona preventing tape 18 is used as a structure component of a stator coil 7 obtained by impregnating prescribed impregnating resin in the winding object with the stator iron core 8 so as to cure it. The corona preventing tape 18 is obtained by impregnating and curing semiconductive resin whose bonding force between layers at the time of curing is inferior to prescribed impregnating resin, in a substrate where reconstituted mica is bound to a high polymer film stiffener 22 having thermal contraction property with epoxy resin composite so as to stick them. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator coil of a rotating electrical machine that is insulated by vacuum pressure impregnation, and more particularly, a stator coil of a rotating electrical machine provided with a corona discharge prevention layer, a method of manufacturing a stator coil of a rotating electrical machine, and semiconductive The present invention relates to a sheet, a semiconductive tape, and a rotating electric machine.

  As shown in FIG. 9, in a stator coil 57 conventionally used in a high voltage and large capacity rotating electrical machine such as a synchronous machine or an induction motor, a strand formed by bundling a plurality of insulated wires 64a. On the conductor 64, the mycate 66 is wound a plurality of times to form the insulating layer 65, and then the winding body (winding unit) on which the insulating layer 65 is formed is vacuum-dried to form a stator. The stator coil 57 is accommodated in the slot 58a of the iron core 58 and connected, and the stator core 58 is impregnated with a non-solvent impregnated resin such as epoxy resin in the voids of the insulating structure, and then heated and cured. Is obtained.

  Here, in the stator coil 57, a conductive material such as carbon is blended in the outer peripheral portion of the insulating layer 65 in order to prevent the occurrence of partial corona discharge between the slots 58a of the stator core 58. A corona-preventing tape 68 made of a glass fiber tape impregnated and cured by impregnating the conductive resin or a tape coated with the conductive resin on a polymer film and cured is wound. A corona prevention layer 67 is formed.

  However, when the stator coil 57 provided with the conventional corona prevention tape 68 is impregnated with an impregnating resin and cured, the interface between the corona prevention layer 67 and the insulating layer 65, or in the insulating layer 65, Separation or voids may occur due to the influence of the falling off of the impregnated resin or the curing shrinkage of the impregnated resin. This peeling or void becomes a factor of deteriorating the dielectric characteristics of the coil insulation. To describe this in detail, due to the effects of thermal deterioration and thermal shrinkage that occur during operation of the rotating electrical machine, the peeling and voids are gradually expanded to increase partial discharge, and the corona prevention layer 67 is formed by the heat of this partial discharge. It is gradually lost. In addition, the missing portion may be enlarged due to electromagnetic vibration during long-term operation of the rotating electrical machine, and the insulating layer 65 may eventually be damaged, leading to a decrease in insulating characteristics.

Due to the influence of such a defective portion, the stator core 58 and the stator coil 57 are not electrically connected to each other and are not at the same potential. Therefore, the occurrence of slot discharge between the stator coil 57 and the stator core 58 is prevented. Will be invited. Therefore, applying a corona-preventing tape in which a laminated mica insulating member composed of laminated mica and an epoxy resin composition is bonded to the opposite surface of a heat-shrinkable polymer film coated with a semiconductive resin. Thus, a stator coil that suppresses a decrease in insulation characteristics has been proposed (see, for example, Patent Document 1).
JP2003-259589A

  Here, as a measure for preventing peeling and voids due to curing shrinkage of the above impregnated resin, it is useful to use a resin having low curing shrinkage, but in general, a resin having low shrinkage during curing is heat resistant. Since it tends to be low, it is difficult to achieve a balance. In view of such points, further improvement of the above-described measures for preventing peeling and voids is required.

  Therefore, the present invention has been made in view of the above circumstances, and effectively prevents the occurrence of peeling and voids that may occur in the insulating layer of the insulating coil or at the interface between the insulating layer and the corona prevention layer. It is an object to provide a stator coil for a rotating electrical machine, a method for manufacturing a stator coil for a rotating electrical machine, a semiconductive sheet, a semiconductive tape, and a rotating electrical machine capable of obtaining good dielectric characteristics in coil insulation. And

  In order to achieve the above-mentioned object, the present invention provides a corona-preventing member formed on an outer peripheral portion of an insulating layer by forming a non-impregnated laminated mica tape on an insulating-coated wire bundle by multiple winding. After winding the wound body formed by applying a corona-preventing layer in a stator core slot and connecting and wiring, the wound body is immersed in an impregnating resin together with the stator core and subjected to vacuum pressure impregnation treatment, impregnation In a stator coil of a rotating electrical machine formed by heat curing a resin, the corona prevention member is a reinforcing material configured using any one of a heat-shrinkable polymer film and a woven fabric. For example, the laminated mica is formed by impregnating and curing a semiconductive resin whose bonding strength between layers at the time of curing is inferior to that of the impregnated resin after being bonded with an epoxy resin composition. Stator carp of rotating electric machine It is.

  As described above, according to the present invention, it is possible to effectively prevent the occurrence of peeling and voids that may occur in the insulating layer of the insulating coil or at the interface between the insulating layer and the corona prevention layer. It is possible to provide a stator coil for a rotating electrical machine, a method for manufacturing a stator coil for a rotating electrical machine, a semiconductive sheet, a semiconductive tape, and a rotating electrical machine capable of obtaining various dielectric characteristics.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a high-voltage motor according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing an internal structure of a stator included in the high-voltage motor, and FIG. FIG. 4 is a cross-sectional view showing the structure of a corona prevention layer constituting the stator coil of FIG. 3.

  As shown in FIG. 1, a high-voltage motor 1 as a rotating electrical machine according to this embodiment includes a rotor 5 having a rotor core 3 having a rotor shaft 10 and a rotor coil 2. It is supported by the fixed structure part containing via a bearing mechanism. The high-voltage motor 1 has a cooling structure that includes a fan 11 that is provided symmetrically at both ends of the rotor shaft 10, a ventilation duct, and the like. The stator 9 described above is mainly composed of a stator coil 7 and a stator core 8.

  As shown in FIG. 2 and FIG. 3, in the stator coil 7 as an insulating coil, for example, a strand conductor 14 formed by bundling a plurality of strands 14 a coated with an insulation coating, and an outer periphery of the strand conductor 14 (Corresponding portion of the total length of the wire conductor 14 that is actually accommodated in the slot of the stator core), the insulating layer 15 formed by multiple winding of the mica tape 16, and further on the outer periphery of the insulating layer 15 A winding body (winding unit) having a corona prevention layer (semiconductive layer) 17 formed by winding a corona prevention tape (semiconductive tape) 18 is accommodated in a slot 8 a of the stator core 8. At the same time, the ends of the strands 14a are electrically connected. Thereafter, the winding body is immersed together with the stator core 8 in a predetermined thermosetting impregnation resin (resin), for example, a solventless thermosetting epoxy resin, and subjected to a vacuum pressure impregnation treatment. Then, the stator coil 7 is obtained by further heat-curing them.

  Here, instead of the mica tape 16 and the corona prevention tape 18 described above, a mica sheet and a corona prevention sheet (semiconductive sheet) formed as a sheet having the same structure may be applied.

  Further, as described above, the stator coil 7 is accommodated in the slot 8a of the stator core 8 having the ground potential as shown in FIG. Specifically, the stator coil 7 is installed on the bottom of the slot 8 a of the stator core 8 via the spacer 20. Further, the side surface of each stator coil 7 is disposed so as to contact the inner side surface of the slot 8 a of the stator core 8. Further, a wedge 12 is driven into the upper surface of the uppermost stator coil 7 through a spacer 19 in the opening (upper in FIG. 2) of the slot 8a of the stator core 8, and this wedge 12 is In the slot 8a of the stator core 8, each stator coil 7 is fixed at a predetermined position in the vertical direction (in FIG. 2).

Next, the structure of the corona prevention tape 18 used for forming the corona prevention layer 17 on the stator coil 7 of this embodiment will be described.
That is, as shown in FIG. 4, the corona-preventing tape 18 was formed by bonding laminated mica with an epoxy resin composition to a polymer film reinforcing material 22 composed of a heat-shrinkable polymer film. By impregnating and curing a semiconductive resin having a lower bonding strength between layers at the time of curing than the above-described impregnating resin used during the vacuum pressure impregnation treatment in the base material (semiconductive aggregate mica layer 23 described later). can get. Thus, the corona-preventing tape 18 has a semiconductive laminated mica layer 23 laminated on the surface on the side in contact with the insulating layer (mica tape 16) 15 on the polymer film reinforcing material 22 so that the familiarity between the layers is improved. On the other hand, the semiconductive resin layer 21 is mainly semiconductive so that the semiconductive resin layer 21 is laminated on the surface on the polymer film reinforcing material 22 on the side in contact with the stator core 8 (the inner wall surface of the slot 8a). Configured as a tape.

  Here, as shown in FIG. 4, one of polyester, polyethylene, and polypropylene is selected as the constituent material of the polymer film reinforcing material 22. In addition, the semiconductive resin impregnated in the base material of the corona-preventing tape 18 has a lower adhesive strength between layers at the time of curing (and / or after curing) than the impregnating resin used at the time of the above-described vacuum pressure impregnation treatment. (So that the bonding strength is low), carbon is blended with a silicone resin or an unsaturated polyester resin. Here, the difference in the adhesive strength (bonding force) between the above-mentioned layers is that the mechanical properties of the individual resins themselves at the time of curing between the impregnating resin used in the vacuum pressure impregnation treatment and the semiconductive resin impregnated in the base material. This is caused by the difference in strength and the ease of impregnation between layers in each resin itself.

  As described above, in the stator coil 7 of the high voltage motor 1 manufactured using the corona prevention tape 18 according to the present embodiment, the impregnating resin applied during the vacuum pressure impregnation treatment to the winding body described above. However, since the semiconductive resin having poor adhesive strength is impregnated into the base material of the corona prevention tape 18 and cured, when the shrinkage of the impregnated resin occurs, the same electric potential as that of the stator core 8 is obtained. Between the polymer film reinforcing material 22 and the semiconductive laminated mica layer 23 in the corona preventing layer 17 (corona preventing tape 18) having a poor adhesive force, which becomes (earth potential), and the semiconductive laminated mica layer 23. The peeling inside tends to occur preferentially. Therefore, according to the stator coil 7 of the present embodiment, the peeling caused by the falling off of the resin that may occur due to the curing shrinkage of the impregnating resin in the insulating layer 15 or at the interface between the insulating layer 15 and the corona prevention layer 17. And the generation of voids can be suppressed, whereby a good corona prevention effect can be obtained.

  Further, in the stator coil 7 of the present embodiment, even if peeling occurs at the interface between the insulating layer 15 (mica tape 16) and the corona prevention layer 17 (corona prevention tape 18), the semiconductivity on the corona prevention layer 17 is present. The property-gathering mica layer 23 exhibits corona resistance, and can prevent defects in the penetration direction of the corona prevention layer 17 due to discharge. Further, in the stator coil 7 of the present embodiment, the polymer film reinforcing material 22 having heat shrinkability on the corona prevention layer 17 is thermally shrunken with the curing of the impregnating resin, so that the corona prevention layer 17 and the insulating layer 15 Generation | occurrence | production of a clearance gap between them is suppressed and, thereby, the outflow of impregnating resin (resin dropping-off) can be prevented.

  As described above, according to the stator coil 7 of the present embodiment, peeling and voids that can occur in the insulating layer 15 of the stator coil 7 or at the interface between the insulating layer 15 and the corona prevention layer 17 are effective. Therefore, during the long-term operation of the high-voltage motor 1, it is possible to suppress the insulating layer 15 from being damaged due to the effects of heat shrinkage, thermal deterioration, electromagnetic vibration, and the like. Good dielectric properties can be obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 5 is a sectional view showing the structure of the corona prevention layer according to the second embodiment, and FIG. 6 is a plan view schematically showing the structure of the semiconductive resin layer constituting the corona prevention layer. .
In the stator coil according to this embodiment, instead of the corona prevention layer 17 (corona prevention tape 18) of the first embodiment, as shown in FIGS. 5 and 6, a corona prevention layer 26 (corona prevention tape 27). It is comprised using.

  That is, the corona prevention layer 26 is formed by laminating a semiconductive laminated mica layer 29 and a semiconductive resin layer 28, and instead of the polymer film reinforcing material 22 of the corona prevention layer 17, a laminated body is formed. A woven fabric is applied as a reinforcing material to be bonded by bonding mica with an epoxy resin composition. The woven fabric functioning as a reinforcing material in the semiconductive resin layer 28 is a polymer fiber (organic fiber) having heat-shrinkability while arranging glass fibers 28a having high mechanical strength in the width direction of the corona prevention tape 27 body. This is an union cloth formed by arranging 28b in the longitudinal direction of the corona prevention tape 27 main body. Here, the polymer fiber 28b is made of, for example, polyethylene terephthalate or polyethylene naphthalate which has high heat resistance and excellent heat shrinkability.

  More specifically, the corona-preventing layer 26 has the above-described vacuum pressure impregnation treatment in a base material in which laminated mica is bonded and bonded to a reinforcing material composed of the above-mentioned woven fabric with an epoxy resin composition. It is obtained by impregnating and curing a semiconductive resin having a lower bonding strength between layers than that of an impregnating resin sometimes used.

  Therefore, according to the stator coil of the present embodiment, the high-shrinkable polymer fibers 28 constituting the corona prevention layer 17 are thermally contracted with the hardening of the impregnating resin, so that the stator coil insulating layer and the corona prevention It is possible to suppress the formation of a gap with the layer 17 and to prevent the impregnating resin from flowing out (resin dropping out). Further, according to the stator coil of the present embodiment, the mechanical strength of the corona prevention layer 26 can be improved by the glass fiber 28a, and the heat resistance of the corona prevention layer 26 is obtained by having the polymer fiber 28b. Can be increased.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a plan view schematically showing the structure of the stator coil according to the third embodiment of the present invention.
As shown in FIG. 7, in this embodiment, a stator coil 37 is exemplified instead of the stator coil 7 of the first embodiment.
That is, as shown in FIG. 7, the stator coil 37 is housed in the slot 8a of the stator core 8 in the manufacturing process of the stator coil 7 of the first embodiment, and each part is electrically connected. For releasing the mold, the corona-preventing layer 17 (corona-preventing tape 18) is partially exposed to the surface of the winding body (before the vacuum pressure impregnation treatment of the impregnating resin). It is manufactured by adding a step of winding and winding the tape 38 at a predetermined interval. The release tape 38 is made of, for example, a fluororesin or a silicone resin having a thickness of about 20 μm, for example. The release tape 38 may be configured as a release sheet, for example. Here, in the stator coil 37, although the release tape 38 is wound on the surface layer (outermost circumference), since the tape is thin, the corona prevention layer 17 exposed between the release tapes 38 and The stator core 8 comes into contact.

  Therefore, according to the stator coil 37 of the present embodiment, in addition to the effect of the stator coil 7 of the first embodiment, it is further allowed that a partial gap is formed when the impregnating resin is cured and contracted. Separation is likely to occur preferentially between the stator core 8 and the release tape 38. As a result, for example, the resin in the insulating layer 15 or at the interface between the insulating layer 15 and the corona prevention layer 17 is obtained. Generation of peeling and voids due to falling off of the film is suppressed, and a good corona prevention effect can be obtained.

  The present invention has been specifically described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the invention. For example, the present invention may be applied to a coil on the rotor side, and furthermore, the semiconductive tape or the semiconductive sheet of the present invention may be applied to various uses such as a breaker rod and a cable coating material. Is possible.

  Next, specific examples of the present invention and comparative examples as prior art will be shown, and the effects of the present invention will be described in more detail by comparing these examples and comparative examples.

[Example 1]
In this example, as shown in FIGS. 3 and 4, the configurations of the stator coil 7 and the corona prevention layer 17 (corona prevention tape 18) described in the first embodiment are specified in more detail. Give an explanation.
That is, in Example 1, as shown in FIGS. 3 and 4, the laminated mica is bonded to the polymer film reinforcing material 22 with the bisphenol A-based epoxy resin composition, and then bonded to the stator core 8. Corona prevention is achieved by impregnating and curing a semiconductive resin having a lower adhesive strength than the impregnating resin used when vacuum winding impregnation treatment is performed after housing the winding body in the slot 8a and electrically connecting the respective parts. Tape 18 was produced.

Here, a 0.025 mm thick polyester film is used as the polymer film reinforcing material 22, and the semiconductive resin to be impregnated and cured has a surface resistivity after curing of 10 ² Ω to 10 ³ Ω. Thus, adjustment was performed by blending carbon black into a silicone resin or an unsaturated polyester resin. Further, from the viewpoint of compatibility (familiarity) between the corona-preventing layer 17 of the stator coil 7 and the insulating layer 15, the laminated mica material constituting the semiconductive laminated mica layer 23 is composed of the laminated layer constituting the insulating layer 25. The same material as mica was used.

  Further, a mica tape 16 not impregnated with resin was wound around a square bar made of aluminum having a length of 10 mm, a width of 50 mm, and a length of 800 mm so that the thickness of the insulating layer 25 became substantially uniform by 1/2 lap winding. . In addition, the above-described corona prevention tape 18 is wound once on the length of 300 mm at the center portion of an aluminum square bar corresponding to the insulation range, and the simulated slot is applied with an iron plate thereon. Was formed using a solventless thermosetting alicyclic epoxy resin composition having a relatively large curing shrinkage, followed by vacuum pressure impregnation treatment and then heat-cured to obtain a coil (stator coil 7).

[Example 2]
In this embodiment, as shown in FIG. 7, the configuration of the stator coil 37 described in the third embodiment will be described in more detail.
That is, as shown in FIG. 7, the release tape 38 is formed so that the corona prevention tape 18 is partially exposed on the outer surface of the stator coil 7 of the first embodiment before the vacuum pressure impregnation treatment. Is blown and wound at a predetermined interval, and a simulated slot is formed by applying an iron plate thereon, and vacuum pressurization is performed using a solventless thermosetting alicyclic epoxy resin composition having a relatively large curing shrinkage. After the impregnation treatment, heat curing was performed to obtain a coil (stator coil 37). Here, a Teflon (registered trademark) tape (for example, 7900-S manufactured by Nippon Valqua Industries, Ltd.) was used as the release tape 38.

[Example 3]
In this example, as shown in FIGS. 5 and 6, the configuration of the corona prevention layer 26 (corona prevention tape 27) described in the second embodiment will be described in more detail.
That is, in Example 3, as shown in FIGS. 5 and 6, the laminated mica was bonded and bonded to the reinforcing material composed of the union cloth with the bisphenol A-based epoxy resin composition, and then the vacuum was applied. A corona-preventing tape 27 was manufactured by impregnating and curing a semiconductive resin having a lower adhesive strength than the impregnating resin used in the pressure impregnation treatment.
Here, as the above-mentioned woven fabric composed of the glass fibers 28a arranged in the width direction of the tape body and the polymer fibers 28b which are polyethylene terephthalate fibers arranged in the longitudinal direction of the tape body, the woven fabric made by Arisawa Manufacturing Co., Ltd. Tape was used. In addition, from the viewpoint of compatibility (familiarity) between the corona-preventing layer 17 of the stator coil 7 and the insulating layer 15, the laminated mica material constituting the semiconductive laminated mica layer 29 is assembled to constitute the insulating layer 25. The same material as mica was used.

  Further, a mica tape 16 not impregnated with resin was wound around a square bar made of aluminum having a length of 10 mm, a width of 50 mm, and a length of 800 mm so that the thickness of the insulating layer 25 became substantially uniform by 1/2 lap winding. . In addition, the above-mentioned corona prevention tape 27 is wound 1/2 times on the central portion of an aluminum square bar corresponding to the insulation range, and the simulated slot is formed by applying an iron plate thereon. Then, a vacuum-pressure impregnation treatment was performed using a solventless thermosetting alicyclic epoxy resin composition having a relatively large curing shrinkage, followed by heat curing to obtain a coil.

[Example 4]
In this embodiment, the release tape 38 is blown at a predetermined interval so that the corona prevention tape 27 is partially exposed on the outer surface of the coil of the embodiment 3 before the vacuum pressure impregnation treatment. Then, a simulated slot is formed by applying an iron plate thereon, followed by vacuum pressure impregnation using a solventless thermosetting alicyclic epoxy resin composition having a relatively large curing shrinkage, and then heat curing. A coil was obtained. Here, a Teflon (registered trademark) tape (for example, 7900-S manufactured by Nippon Valqua Industries, Ltd.) was used as the release tape 38.

[Comparative Example 1]
A corona-preventing tape was produced in which a laminated mica insulating member composed of laminated mica and an epoxy resin composition was bonded to the opposite surface of the glass substrate on which the semiconductive resin was applied.
Further, a mica tape not impregnated with resin was wound around a square bar made of aluminum having a length of 10 mm, a width of 50 mm, and a length of 800 mm so that the thickness of the insulating layer 25 became substantially uniform by 1/2 lap winding. In addition, the above-mentioned corona prevention tape is wound on the central portion of an aluminum square bar corresponding to the insulating range to a length of 300 mm and wound once in half, and a steel slot is further applied thereon to form a simulated slot. A coil was obtained by heat-curing after a vacuum pressure impregnation treatment using a solventless thermosetting alicyclic epoxy resin composition having a relatively large curing shrinkage.

[Comparative Example 2]
A corona-preventing tape was produced in which a laminated mica insulating member composed of laminated mica and an epoxy resin composition was bonded to the opposite surface of the polymer film coated with the semiconductive resin.
Furthermore, a coil was obtained by the same production method as in Comparative Example 1 using this corona-preventing tape.

[Consideration of Examples 1 to 4 and Comparative Examples 1 and 2]
Here, FIG. 9 shows voltage-tan δ characteristics as the dielectric characteristics of the coils of Examples 1 to 4 and Comparative Examples 1 and 2. As shown in FIG. 9, the voltage-tan δ characteristic is lower in Comparative Example 2 than in Comparative Example 1, and the voltage-tan δ characteristics are lower in Examples 1 to 4 than in Comparative Example 2. Value, and good dielectric properties are obtained.
Furthermore, after the test, each coil was cut and cross-sectional observation was performed.
As a result, peeling was observed at the interface between the corona-preventing layer and the insulating layer in the cross sections of the coils used in Comparative Examples 1 and 2. On the other hand, there is no peeling at the interface between the corona prevention layer and the insulating layer in the cross section of the coils of Examples 1 to 4, and between the iron plates and the corona prevention layer, or in the semiconductive laminated mica layer in the corona prevention layer Peeling was observed. Note that peeling between the iron plate and the corona prevention layer was noticeable in the coils of Examples 2 and 4. Further, the difference in the voltage-tan δ characteristics between Comparative Example 1 and Comparative Example 2 is presumed to be mainly due to the difference in the occurrence of peeling or voids due to the resin outflow (resin dropout) during the curing of the impregnated resin. The

1 is a cross-sectional view schematically showing a high voltage motor according to a first embodiment of the present invention. Sectional drawing which shows the internal structure of the stator with which the high-voltage motor of FIG. 1 is provided. Sectional drawing which shows the structure of the stator coil which comprises the stator of FIG. Sectional drawing which shows the structure of the corona prevention layer which comprises the stator coil of FIG. Sectional drawing which shows the structure of the corona prevention layer which concerns on 2nd Embodiment of this invention. The top view which shows typically the structure of the semiconductive resin layer which comprises the corona prevention layer of FIG. The top view which shows roughly the structure of the stator coil which concerns on 3rd Embodiment of this invention. The figure which shows the voltage-tan-delta characteristic which is the dielectric characteristic of the insulation coil of Examples 1-4 of this invention, and Comparative Examples 1 and 2. FIG. Sectional drawing which shows the internal structure of the stator with which the conventional rotary electric machine is provided.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... High voltage electric motor (rotary electric machine) 7, 37 ... Stator coil (insulation coil), 8 ... Stator iron core, 8a ... Stator core slot, 9 ... Stator, 14 ... Wire conductor, 14a ... Element Wires 15 ... insulating layer 16 ... mica tape 17,26 ... corona prevention layer (semiconductive layer) 18,27 ... corona prevention tape (semiconductive tape) 21,28 ... semiconductive resin layer, 22 ... polymer film reinforcing material, 23, 29 ... semiconductive laminated mica layer, 28a ... glass fiber, 28b ... polymer fiber, 38 ... release tape.

Claims (11)

An insulating layer is formed by multiple winding of an unimpregnated laminated mica tape on an insulated wire bundle, and a corona prevention member is wound around the outer periphery of the insulation layer to form a corona prevention layer. After rotating and storing the winding body in the stator core slot, the wound body is immersed in an impregnating resin together with the stator core and subjected to a vacuum pressure impregnation treatment, and the impregnating resin is heated and cured. In the stator coil,
The corona-preventing member is formed by bonding laminated mica with an epoxy resin composition to a reinforcing material configured using any one of a heat-shrinkable polymer film and a woven fabric, A stator coil for a rotating electrical machine, wherein the stator coil is formed by impregnating and curing a semiconductive resin having a lower bonding strength between layers than the impregnated resin.   A release member made of a fluororesin or a silicone resin is wound around the outer periphery of the corona prevention member at an arbitrary interval so that a part of the surface of the corona prevention member is exposed. The stator coil of the rotary electric machine according to claim 1.   The stator coil for a rotating electrical machine according to claim 1, wherein the corona prevention member is a corona prevention tape or a corona prevention sheet.   The stator coil of a rotating electrical machine according to claim 3, wherein the corona prevention member is formed of any one of a heat-shrinkable polymer film among a polyester film, a polyethylene film and a polypropylene film.   The corona-preventing member is formed of a woven fabric reinforcing material in which glass fibers are arranged in the width direction and fibers made of either heat-shrinkable polyethylene terephthalate or polyethylene naphthalate are arranged in the longitudinal direction. The stator coil of the rotating electric machine according to claim 3, wherein the stator coil is formed.   The stator coil for a rotating electrical machine according to claim 1 or 2, wherein any one of a silicone resin blended with carbon and an unsaturated polyester resin blended with carbon is used as the semiconductive resin.   An insulating layer is formed by multiply winding unimpregnated laminated mica tape on a wire bundle with insulation coating, and a modified mica is bonded to the reinforcing material with an epoxy resin composition on the outer periphery of the insulating layer. A corona-preventing layer is formed by winding a corona-preventing member formed by impregnating and curing a semiconductive resin after being attached and bonded, and then housed and connected to a stator core slot, more than the semiconductive resin. A method for manufacturing a stator coil of a rotating electrical machine, wherein the stator coil is immersed in an impregnating resin having superior bonding strength between layers at the time of curing together with the stator core, vacuum-pressurized and impregnated, and heat-cured.   8. A release member made of a fluororesin or a silicone resin is wound around the outer periphery of the corona prevention member at an arbitrary interval so that a part of the corona prevention member is exposed. The manufacturing method of the stator coil of the rotary electric machine of description. An insulating layer is formed by multiple winding of unimpregnated laminated mica tape on a wire bundle on which insulation coating has been applied, and a winding body formed by winding semiconductive tape around the outer periphery of the insulating layer is used as a stator. The semiconductive tape used as a component of a stator coil obtained by storing and connecting in an iron core slot and impregnating and hardening a predetermined impregnation resin to the winding body together with the stator iron core,
In a base material in which laminated mica is bonded with an epoxy resin composition to a reinforcing material formed using any one of a heat-shrinkable polymer film and a woven fabric, A semiconductive sheet obtained by impregnating and curing a semiconductive resin having poor bonding strength between layers during curing.   The semiconductive tape according to claim 9, wherein the semiconductive sheet is formed in a tape shape.   A rotating electrical machine comprising the stator coil according to any one of claims 1 to 6.

Images