JPH11215754A - Coil for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil for a rotary electric machine, capable of increasing the electric insulation performance of an electric insulation layer and the long- term reliability of the performance thereof and also contributing to the reduction in the manufacturing cost. SOLUTION: A coil (stator coil) 1 for a rotary electric machine differs from the conventional one, only in that an electrical insulation layer (ground insulation layer) 11 made by winding an electrical insulation tape 2 is used. The electrical insulation tape 2 is constituted of a basic material 81, a mica sheet layer 3, an adhesive layer 83 for pasting the mica sheet layer 3 to the basic material 81, and a hardening accelerator-made added layer 84 added onto the mica sheet layer 3. In the mica sheet layer 3, a plurality of channels 31 of a rectangular cross-sectional shape are formed as penetration channels for making easy penetration of liquid resin material for impregnation into a wire wound layer, in parallel with each other at an interval in the longitudinal direction of the electrical insulation tape 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil for a rotating electric machine, and more particularly to an improved configuration of an electrical insulating layer for ground insulation or the like to improve the electrical insulation performance and its long-term reliability.

[0002]

2. Description of the Related Art In coils mounted on, for example, a stator of a high-voltage rotating electric machine (such as a generator or an electric motor), a wire that is a wire-insulated conductor (often a flat copper wire) is used. In many cases, a turtle-shaped coil or a Gitter (transition) coil in which dislocations are applied to a wire are used. The electrical insulation layer for ground insulation of these coils is required to have high electrical insulation performance.
It may be simply referred to as an insulating tape. )
It is generally formed by impregnating a liquid impregnating resin material and then performing a curing treatment. This insulating tape used for the electrical insulation layer, well-known mica sheet,
It is formed by bonding a known base material using a tape-shaped woven fabric or non-woven fabric made of glass or polymer fibers with an adhesive.

A conventional coil for a rotating electric machine having an electric insulating layer using such an insulating tape is described below.
Next, a description will be given with reference to the drawings. FIG. 15 is a cross-sectional view schematically showing a part of a conventional coil for a rotating electric machine together with peripheral devices. FIG. 16 is a schematic view showing an insulating tape used for the coil shown in FIG. FIG. In FIG. 15, reference numeral 9 denotes a flat copper wire to which a wire insulation (not shown) is applied as a wire 92, and is formed using a coil portion 91 formed as an aligned body of the wires 92 and an insulating tape 8. The stator coil includes a ground insulating layer 93 that is an electrical insulating layer for ground insulation. In this case, the coil portion 91 is formed by aligning the wires 92 in two rows and nine steps. The stator coil 9 is loaded in a winding groove 95 provided in a well-known stator core 94 on the coil side. FIG.
In the example shown in FIG. 5, the coil sides of the two stator coils 9 are wound in two layers and are loaded in the same winding groove 95, and a well-known coil Insulating layer 9
6 is interposed. A well-known wedge 97 is mounted on the opening side of the winding groove 95.

A conventional insulating tape 8 used for a stator coil 9 will be described with reference to FIG. The insulating tape 8 includes a base material 81, a mica sheet layer 82, and an adhesive layer 8 for bonding the base material 81 and the mica sheet layer 82.
3 and, in this case, a hardening accelerator-added layer 84 added to the mica sheet layer 82. The polymer material applied to the fiber material for the base material 81 is, for example, a polyimide resin, a polyester resin, a polyamide-imide resin, or the like. Tape-shaped woven or non-woven fabrics made of a single or composite of the above fibers are used. Further, the mica sheet layer 82 may use a mica piece such as a foil piece or a scale piece such as peeled mica or laminated mica, and a tape-shaped mica sheet manufactured by a method similar to a method of manufacturing Japanese paper may be used. General.

[0005] The ground insulating layer 93 of the stator coil 9 has
A liquid impregnating resin material is impregnated with a liquid pressure impregnating resin material by a vacuum pressing method into a wound layer obtained by winding a plurality of layers of the insulating tape 8 by a well-known lap winding, and an air layer contained in the winding layer is impregnated with the resin material. The impregnated resin material impregnated in the wound layer is subjected to a heat-curing treatment. Examples of the impregnating resin material include well-known thermosetting resin materials such as an epoxy resin monomer (for example, bisphenol A type or bisphenol F type epoxy resin) and a curing agent (for example, acid anhydride). A liquid thermosetting resin material is employed.

[0006] A curing accelerator is used to accelerate the curing reaction of the liquid thermosetting resin material. When the liquid thermosetting resin material is the epoxy resin material, the curing accelerator may be, for example, a curing reaction between an epoxy resin monomer such as a metal salt, imidazoles and tertiary amines and an acid anhydride. A material having a function of promoting the use is used. The hardening accelerator addition layer 84 is obtained by dropping a hardening accelerator solution obtained by, for example, diluting an appropriate hardening accelerator with a well-known solvent compatible with the hardening accelerator onto a mica sheet to be a mica sheet layer 82. Is formed. This additional layer 84
As shown in FIG. 16, a hardening accelerator solution is dropped and dried so that the hardening accelerator is added almost uniformly to the entire surface of the mica sheet. Note that a case in which the additive layer 84 is formed on the base material 81 is also known.

In this case, for the adhesive layer 83, a liquid adhesive made of a polymer resin material such as an epoxy resin material is used.
It is formed by dropping into As the epoxy resin material used for forming the adhesive layer 83, a mixture of a solid epoxy resin and a liquid epoxy resin is used in many cases. As shown in FIG. 16, a resin solution is dropped onto the entire surface of the base material 81 so that the adhesive is almost uniformly added to the adhesive layer 83. Then, the insulating tape 8 is formed by laminating the mica sheet layer 82 having the hardening accelerator addition layer 84 and the base material 81 while dripping the resin solution and drying the insulating tape 8.

The ground insulating layer 93 is formed by winding the insulating tape 8 and impregnating a liquid impregnating resin material by a vacuum pressurizing method. Processing method performed for each coil 9 (simple impregnation processing method)
And an individual stator coil 9 having a winding layer
15 and the state shown in FIG.
There is known a processing method (a total impregnation processing method) in which a plurality of stator coils 9 included in the device 4 are simultaneously connected after electrical connection and the like are completed. In the single impregnation treatment method, the impregnation treatment of the liquid impregnating resin material is generally performed using a mold having a clamping structure while the ground insulating layer is clamped. In recent years, the total impregnation method has been widely adopted from small machines to large machines because the number of manufacturing steps can be easily reduced and high heat conduction performance can be easily obtained.

In order to sufficiently impregnate the wound layer with the liquid impregnating resin material to replace the air layer contained in the wound layer, it is necessary to lower the viscosity of the impregnating resin material. The temperature of the stator coil 9 and the resin material for impregnation needs to be maintained at a high value of several tens of degrees. However,
The hardening accelerator forming the additional layer 84 of the insulating tape 8 has a well-known property that the hardening of the impregnating resin material is rapidly accelerated when the temperature exceeds a certain temperature. When the temperature exceeds this temperature, the impregnating resin material is cured before being sufficiently penetrated into the wound layer, thereby causing impregnation failure. For this reason, the impregnation temperature is determined in consideration of both the impregnation of the wound layer with the resin material for impregnation and the reactivity of the curing accelerator.

In the treatment method of the impregnating resin material by the simple impregnation treatment method, impregnation failure is apt to occur because the wound layer is tightened by using a mold before the impregnation treatment is performed. In this case, since the impregnation of the resin material for impregnation needs to be performed by one impregnation process for all the stator coils 9 loaded in the stator core 94, the leakage of the resin material for impregnation (resin leakage) occurs. It tends to occur easily. For this purpose, as the insulating tape 8, a dedicated tape compatible with the single impregnation processing method and a dedicated tape compatible with the entire impregnation processing method are prepared, and these dedicated insulating tapes 8 are applied. They are used properly according to the method of impregnation of the resin material for impregnation.

[0011]

In the above-described stator coil 9 according to the prior art, it is possible to form an electrical insulating layer having a reasonable electrical insulation performance by impregnating with a liquid impregnating resin material. However, there are the following problems, and improvement is desired. That is, it is necessary to prepare a dedicated insulating tape 8 for each processing method of the impregnating resin material for forming the electrical insulating layer, so that the price of the insulating tape 8 including the management cost becomes high,
As a result, the manufacturing cost of the rotating electric machine is high.

In the case where the total impregnation method is adopted, a tape for preventing resin leakage is provided at the coil end portion to prevent resin leakage, or the resin material for impregnation after impregnation processing is used. Before the heat curing treatment, a method of spraying a curing accelerator solution to the coil end portion to promote the curing of the outermost layer of the electric insulating layer has been adopted. However,
The former method causes an increase in manufacturing cost due to the use of the resin leakage prevention tape. In the latter method, the amount of the curing accelerator solution cannot be equalized due to the three-dimensional shape of the coil end portion.
It is difficult to completely prevent resin leakage. Further, since the sprayed hardening accelerator solution does not directly act on the electric insulating layer in the winding groove 95, it is not always effective from the viewpoint of preventing the generation of voids in the electric insulating layer. Further, this method causes a large amount of the curing accelerator solution to be scattered in the working space, and thus has an adverse effect on the working environment for manufacturing the coil.

In the case of a rotating electric machine which is used under a high voltage such as a rated voltage of 16 [kV] or more, the thickness of an electric insulating layer (such as the ground insulating layer 93), The thickness of the layer will increase significantly. The permeability of the liquid impregnating resin material into the wound layer in the insulating tape 8 depends on the particle size and density of the mica pieces used in the mica sheet layer 82, the amount of the adhesive added in the adhesive layer 83, and the distribution thereof. It is known that the amount of the hardening accelerator added to the additive layer 84 and its distribution state have an effect. Also, it is known that the amount of the curing accelerator added and the temperature of the impregnation treatment are relatively greatly involved in resin leakage.

Above all, the curing accelerator gradually progresses the curing reaction of the impregnating resin material even at an appropriate impregnating temperature due to its properties. An increase in viscosity of the liquid impregnating resin material causes impregnation failure, and thus causes voids. Also, if the addition amount of the curing accelerator is too small,
The liquid impregnating resin material can easily penetrate, but when the impregnating resin material is heat-cured, the curing is slowed, so that the occurrence of resin leakage increases, and even in this case, the voids are increased. It causes the occurrence. That is, if the addition amount of the curing accelerator is too small, the holding ability for holding the liquid impregnating resin material in the wound layer until the curing is completed is reduced. The addition amount of the curing accelerator has a large effect on the permeability and retention of the resin material for impregnation as described above, and
Since the effects on the permeability and the retentivity are opposite to each other, it is necessary to finely adjust the addition amount.

In addition, the permeation path of the liquid impregnating resin material into the winding layer of the conventional stator coil 9 is different from the permeation path that permeates the insulating tape 8 in a direction perpendicular to the surface of the insulating tape 8. There is a permeation route that permeates along. However, when the impregnating resin material is impregnated into the wound layer having a large thickness, the impregnated resin material that has penetrated into the wound layer gradually increases in viscosity due to the progress of the curing reaction. Since it is difficult to penetrate into the deep wound layer, further penetration is not performed, and impregnation failure of the impregnating resin material occurs.

By using a special insulating tape 8 for the single impregnation treatment method and the full impregnation treatment method as the insulation tape 8, it is possible to increase the thickness of the wound layer to some extent where the occurrence of impregnation failure becomes remarkable. Become. However, the effect of increasing the thickness of the wound layer is also limited, and the frequency of occurrence of impregnation failure of the impregnating resin material will eventually increase. If impregnation failure of the impregnating resin material occurs, the air layer included in the wound layer cannot be replaced with the impregnating resin material, and thus voids remain in the electrical insulating layer. As is well known, partial discharge occurs in voids in the electrical insulation layer including voids, and the electrical insulation performance is reduced due to partial discharge deterioration during long-term operation. There is an increased concern that dielectric breakdown will occur.

FIG. 17 shows the stator coil 9 in which a gap remains in the ground insulating layer 93. Here, FIG.
FIG. 15 is an explanatory diagram for explaining a situation in which a void remains in the ground insulating layer of the stator coil, and is drawn in the same manner as the stator coil shown in FIG. In FIG. 17, the same portions as those of the stator coil shown in FIG. 15 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 17, reference numeral 99 denotes a void remaining in the ground insulating layer 93. The inventors have 1
With respect to the ground insulating layer corresponding to the rated voltage of 3.8 [kV] class, a test for evaluating the penetration rate of the resin material for impregnation and the content of voids was performed. The former was evaluated based on the rate of increase in the capacitance of the ground insulating layer during the impregnation treatment with the resin material for impregnation, and the latter was carried out by initial partial discharge maximum discharge charge and well-known SEM observation.

The measurement result of the rate of increase of the capacitance of the ground insulating layer is shown in a graph drawn by a thin dotted line in FIG. 13 described later. It has been confirmed that the penetration rate of the impregnating resin material is the slowest in the conventional ground insulating layer. The measurement results of the initial partial discharge maximum discharge charge amount are shown in FIG.
4 is shown as a graph drawn by a thin dotted line. This measurement result is not at a satisfactory level as a ground insulating layer corresponding to a rated voltage of 13.8 [kV] class. This suggests that the ground insulating layer according to the conventional example contains many voids.
It is also confirmed by the results of EM observation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to improve the electrical insulation performance of an electrical insulation layer and its long-term reliability and reduce the manufacturing cost. An object of the present invention is to provide a coil for an electric machine.

[0020]

According to the present invention, there are provided the following objects: 1) a coil portion formed by using a wire and at least a part of the outer periphery of the coil portion so as to go around the outer periphery of the coil portion; An insulating layer formed by impregnating and curing a liquid impregnating resin material on a wound layer of the electrical insulating tape formed by winding and covering the electrical insulating tape, wherein the electrical insulating tape is made of a fiber made of an electrical insulating material. A base material formed into a tape shape using a material,
A tape-shaped mica sheet layer bonded to a base material using an adhesive, and an addition layer of a curing accelerator for promoting a curing reaction of the impregnating resin material applied to the base material and / or the mica sheet layer; Wherein the electric insulating tape has a configuration in which a permeation path for facilitating the permeation of the liquid impregnating resin material into the winding layer is formed, or 3. The method according to claim 1, wherein the permeation path is a concave groove formed in the base material and / or the mica sheet layer. A plurality of concave grooves are formed at intervals in the length direction of the electrical insulating tape so as to cross the width direction of the electrical insulating tape; or 4) In the means described in the above item 2, , The grooves are The grooves are formed so as to intersect with the grooves belonging to other groove groups. 5) The means according to any one of the above items 2 to 4, wherein the groove is formed in the base material and / or the mica sheet layer by a pressurization method. Or 6) In the means according to any one of the above items 2 to 5, the adhesive has a portion of the electric insulating tape where the concave groove is formed, and a groove. Or 7) the method according to any one of the above items 2 to 6, wherein the added layer of the curing accelerator is formed of an electrically insulating tape. The area where the groove is formed and the groove is formed And 8) the method according to any one of the above items 1 to 7, wherein the addition amount of the curing accelerator is made different from that of the non-cured part. This is achieved by a configuration in which the accelerator is covered with a layer of a polymer material having a melting point lower than the curing temperature of the resin material for impregnation and formed in a granular form.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description of this section, the same parts as those of the conventional rotary electric machine coil shown in FIGS. 15 and 16 are denoted by the same reference numerals, and description thereof will be omitted. In addition, in the drawings used in the following description, only reference numerals shown in FIGS. 15 and 16 are represented as much as possible.

FIGS. 1A and 1B are diagrams schematically showing a coil according to an embodiment of the present invention. FIG. 1A is a cross-sectional view of the coil, and FIG. 1B is a sectional view of the coil shown in FIG. It is sectional drawing of the electric insulating tape used. Also, FIG.
FIG. 3 is a top view of the electrical insulating tape according to FIG.
FIG. 3 is an explanatory view illustrating a method of forming a concave groove of the electrical insulating tape shown in FIGS. 1 and 2.

In FIG. 1 to FIG. 3, reference numeral 1 designates an insulating layer, which is different from the conventional coil (stator coil) 9 shown in FIG. This is a stator coil using a ground insulating layer 11 which is an electrical insulating layer for ground insulation formed by winding a tape 2. The ground insulating layer 11 includes the coil section 9.
A liquid impregnating resin material impregnated by a vacuum pressing method is heat-cured to a wound layer obtained by winding a plurality of layers of the insulating tape 2 by a well-known lap winding so as to surround the outer periphery of 1. It is formed by things. The insulating tape 2 is made of a base material 81
, Mica sheet layer 3, substrate 81 and mica sheet layer 3
And an additive layer 84 of a curing accelerator added to the mica sheet layer 3.

The method of forming the adhesive layer 83 and the hardening accelerator additive layer 84 is the same as that of the conventional insulating tape 8. When the mica sheet layer 3 is compared with the mica sheet layer 82 according to the conventional example, the mica sheet layer 3 has a structure characteristic of a coil for a rotary electric machine according to the present invention, and is a wound layer of a liquid impregnating resin material. The difference is that a concave groove 31 having a rectangular cross-section, which is a permeation path for facilitating permeation into the air, is formed. As shown in FIG. 2, a plurality of concave grooves 31 are formed in parallel with each other at substantially equal intervals along the length direction of the insulating tape 2.

An outline of a method of forming the concave groove 31 in the mica sheet layer 3 will be described with reference to FIG. In FIG. 3, the roller 39 is drawn away from the mica sheet layer 3 for convenience of description, but in actuality, the roller 39 is arranged so as to press the mica sheet layer 3. Now, in the production of a tape-like mica sheet produced by a method similar to the method of producing washi using mica pieces, rolling is performed for dehydration and adjustment of the sheet thickness as is well known. But,
The roller 39 used for producing the mica sheet layer 3 is provided with a plurality of annular projections 38 having a rectangular cross section at intervals. The concave groove 31 is formed by strongly pressing the mica sheet with the protrusion 38.

The coil (stator coil) for a rotating electric machine according to an embodiment of the present invention shown in FIGS. 1 to 3 has the above-described configuration, so that the insulating tape 2 is used in the stator coil 9 of the conventional example. The wound layer formed by winding in the same manner as in the case of the insulating tape 8 has the insulating tape 2 as a permeation path of the liquid impregnating resin material to the wound layer in the above-described permeation path of the insulating tape 8. The concave groove 31 will be added. As a result, in the stator coil 1, the penetration speed of the liquid impregnating resin material into the winding layer is increased, so that the impregnating resin is also applied to the ground insulating layer (electric insulating layer) 11 having a large layer thickness. The material can be sufficiently impregnated.

When the mica sheet layer 3 is impregnated with the liquid impregnating resin material, the volume of the mica sheet layer 3 is increased. Because I'm going to return to the state before being pressed,
The concave groove 31 will be closed. This allows
The permeated liquid impregnating resin material is confined in the wound layer. That is, in the ground insulating layer 11 of the stator coil 1, in addition to the holding property by the hardening accelerator added to the additional layer 84, the holding property by closing the concave groove 31 is obtained, so that the holding property is obtained. It can be increased, and the performance of preventing resin leakage can be improved. Further, since the permeability of the liquid impregnating resin material in the wound layer is increased as described above, it is possible to set the amount of the curing accelerator added to the additional layer 84 with emphasis on the retention. Therefore, the retention by the curing accelerator can be increased.

Thus, in the stator coil 1 using the insulating tape 2, even if the ground insulating layer 11 requires a large layer thickness in order to be used at a high rated voltage, it is impregnated with the liquid. Since the wound resin material is sufficiently impregnated in the wound layer and is heated and cured in that state, the generation of voids is greatly reduced. Therefore, the stator coil 1
Can improve its electrical insulation performance and long-term reliability. Further, the insulating tape 2 can be shared for both the case of the full impregnation processing method and the case of the single impregnation processing method. The cost of the tape 2 can be reduced. Furthermore, if the all-impregnation treatment method is adopted, the above-mentioned resin leakage prevention measures for the coil end part are not required at all,
Even if the resin leakage preventing process is performed, it can be made relatively light. This makes it possible to reduce the manufacturing cost of the stator coil 1 employing the total impregnation method and to improve the working environment for manufacturing the stator coil 1.

FIG. 4 is a drawing schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention. FIG. 4 (a) is a cross section in which a concave groove formed in a mica sheet layer has a semicircular shape. (B) is a cross-sectional view in the case where the groove formed in the mica sheet layer has a triangular cross-section. In FIG. 4A, 2A corresponds to FIGS.
This is an insulating tape in which a mica sheet layer 3A is used instead of the mica sheet layer 3 with respect to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIG. .

The mica sheet layer 3A is
In contrast to this, as a groove as a penetration path of the liquid impregnating resin material, a groove 31A having a semicircular cross section with the same groove width.
The only difference is that they have For this reason, the cross-sectional area of the groove 31 </ b> A as a penetration path of the liquid impregnating resin material is reduced as compared with the case of the groove 31. When the mica sheet layer 3A is impregnated with the liquid impregnating resin material, the groove 31A is formed.
The time required for the groove to be closed is shorter than in the case of the groove 31 due to the small cross-sectional area. FIG. 4 (b)
2B, the mica sheet layer 3B is used instead of the mica sheet layer 3 with respect to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS. This is an insulating tape to be used.

The mica sheet layer 3B is composed of the mica sheet layer 3
In contrast, the concave groove 31B having the same groove width and a triangular cross section is used as a concave groove as a penetration path of the liquid impregnating resin material.
The only difference is that they have For this reason, the cross-sectional area of the concave groove 31B as a permeation path of the liquid impregnating resin material is naturally smaller for the concave groove 31 than for the concave groove 31A. Further, the mica sheet layer 3
The time required for the groove 31B to be closed when B is impregnated is naturally shorter for the groove 31 than for the groove 31A due to the small cross-sectional area.

That is, by appropriately setting the cross-sectional shape of the concave groove, which is a penetration path of the liquid impregnating resin material, the permeability and the retention of the liquid impregnating resin material in the wound layer are optimally finely adjusted. can do. The groove 31
A, a method of forming the concave groove 31B will be described in comparison with the roller 39. An annular protrusion (roller 39) to be provided on a roller (not shown) for forming the concave grooves 31A and 31B will be described.
In this case, the projection 38) may have a semicircular or triangular cross-sectional shape, respectively.

FIG. 5 is a top view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. In FIG. 5, 2C denotes a ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS.
The insulating tape 2 used for the mica sheet layer 3
This is an insulating tape in which a mica sheet layer 3C is used instead. To continue the description while comparing FIG. 5 with FIG.
The groove 31 </ b> C as a penetration path of the liquid impregnating resin material of the mica sheet layer 3 </ b> C has the same groove width and cross-sectional shape as the groove 31.

The difference between the groove 31C and the groove 31 is as follows.
The only difference is that a plurality of concave grooves 31C are formed continuously at substantially equal intervals in the length direction of the insulating tape 2C so as to cross the width direction of the insulating tape 2C. Thus, the concave groove 31C has a feature that it has an opening on the side surface of the insulating tape 2C. A method for forming such a groove 31C will be described in comparison with the roller 39. The protrusions that a roller (not shown) for forming the grooves 31C in the mica sheet should have are provided with a plurality of protrusions at intervals. It must be arranged radially about the axis of the roller. Then, the width of the projection may be made equal to the length of the roller, and the cross-sectional shape may have a rectangular cross-sectional shape for the groove 31C.

A coil (stator coil) for a rotating electric machine according to a different example of the embodiment of the present invention using the insulating tape 2C shown in FIG. 5 has the above-described configuration, so that the insulating tape 2C is fixed to the present invention. In the wound layer formed by winding in the same manner as the case of the insulating tape 2 in the slave coil 1, the penetration path of the liquid impregnating resin material by the groove of the insulating tape is formed by the groove 31C. . Since the concave groove 31C has an opening on the side surface side of the insulating tape 2C, the liquid impregnating resin material that tends to penetrate into the wound layer along the overlap of the insulating tape 2C can easily penetrate from the concave groove 31C. Become. Thus, the stator coil having the winding layer using the insulating tape 2C is different from the stator coil 1 having the winding layer using the insulating tape 2 in that the liquid impregnating resin material for the winding layer is used. Is increased.

That is, in the stator coil having the winding layer using the insulating tape 2C, while maintaining the operation and effect of the stator coil 1, the generation of the air gap is further reduced, and the electric insulation performance and the long term Reliability can be further improved. The present inventors conducted tests on various ground insulating layers according to the present invention corresponding to a rated voltage of 13.8 [kV] class to evaluate the penetration rate of the impregnating resin material and the degree of void generation. The former was evaluated based on the rate of increase in the capacitance of the ground insulating layer during the impregnation of the resin material for impregnation, and the latter was performed by measuring the initial partial discharge maximum discharge charge. FIG. 13 is a graph showing a measurement example of the rate of increase in the capacitance of the ground insulating layer during the impregnation treatment of the various stator coils according to the present invention with the resin material for impregnation in comparison with the conventional example. .

FIG. 14 is a graph showing a measurement example of the initial partial discharge maximum discharge charge amount for various stator coils according to the present invention in comparison with the conventional example. 13 and 14, the measurement results obtained for the stator coil using the insulating tape 2C are both shown as graphs drawn with thick broken lines. According to these measurement results, the penetration rate of the impregnating resin material is improved as compared with the conventional example, and the initial partial discharge maximum discharge charge amount, which means the content of voids included in the electric insulating layer, is the same as that of the conventional example. It has been confirmed that it is reduced for the example. That is, it has been confirmed that the use of the insulating tape 2C improves the electrical insulation performance of the electrical insulation layer of the stator coil and its long-term reliability.

FIG. 6 is a drawing schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. FIG. 6A is a top view of the insulating tape in which concave grooves are formed in a lattice shape. FIG. 2B is a top view of the insulating tape in which the concave groove is formed in an oblique cross shape. In FIG. 6A, 2
D shows that the mica sheet layer 3D is used instead of the mica sheet layer 3 for the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS. Insulating tape. Mica sheet layer 3
D is a rectangular groove formed in parallel with each other at substantially equal intervals along the length direction of the insulating tape 2D as a concave groove as a permeation path of the liquid impregnating resin material when compared with the mica sheet layer 3. A group of grooves 31D having a shape cross section and a groove 32D having a rectangular cross section formed continuously at substantially equal intervals in the length direction of the insulating tape 2D so as to cross the width direction of the insulating tape 2D. It is different to be a group.

A groove 31D included in the group of the grooves 31D;
The grooves 32D included in the group of the grooves 32D are disposed so as to intersect at right angles to each other. In addition,
The cross-sectional shapes and dimensions of the concave grooves 31D and 32D are the same, and the cross-sectional shapes and dimensions of the concave grooves 31 are also the same. The group of the concave grooves 31D and the group of the concave grooves 32D are simultaneously formed using, for example, a roller, and the roller used for the group is the same as the group of the protrusions 38 used for forming the concave groove 31. It is necessary to integrally provide the group of the protrusions used for forming the concave groove 31C.

The coil (stator coil) for a rotating electric machine according to a different example of the embodiment of the present invention using the insulating tape 2D shown in FIG.
The wound layer formed by winding the insulating tape 2D in the same manner as the case of the insulating tape 2 in the stator coil 1 according to the present invention has a concave channel in which the liquid impregnation resin material penetrates through the concave groove of the insulating tape. It is formed by the groove 31D and the concave groove 32D. As a result, as compared with the case of the stator coil having the winding layer formed by winding the insulating tape 2C shown in FIG. 5, the liquid that is likely to penetrate into the winding layer along the overlap of the insulating tape 2D. The resin material for impregnation of the groove 31
D and the groove 32D can easily penetrate.

As a result, the stator coil having the winding layer using the insulating tape 2D is different from the stator coil having the winding layer using the insulating tape 2C in that the liquid impregnating resin for the winding layer is used. The rate of penetration of the material is increased. That is, the use of the insulating tape 2D further reduces the generation of voids while maintaining the operation and effect obtained by the stator coil using the insulating tape 2C, and further improves the electrical insulation performance and long-term reliability. can do.

In FIG. 6B, 2E corresponds to FIGS.
In this embodiment, a mica sheet layer 3E is used in place of the mica sheet layer 3 with respect to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIG. When compared with the mica sheet layer 3, the mica sheet layer 3E is formed as a concave groove as a permeation path of the liquid impregnating resin material so as to obliquely cross the width direction of the insulating tape 2E and extend in the length direction of the insulating tape 2E. The difference is that the grooves 31E and the grooves 32E are formed continuously at substantially equal intervals and each have a group of grooves 31E having a rectangular cross section. Thus, the concave groove 31E and the concave groove 32E are formed so as to be mutually symmetrical with respect to the center line with respect to the width of the insulating tape 2E. Such a group of the concave grooves 31E and a group of the concave grooves 32E are simultaneously formed by using, for example, a roller.

The coil (stator coil) for a rotating electric machine according to a different example of the embodiment of the present invention using the insulating tape 2E shown in FIG.
The wound layer formed by winding the insulating tape 2E in the same manner as the case of the insulating tape 2 in the stator coil 1 according to the present invention has a concave channel in which the liquid impregnating resin material penetrates through the concave groove of the insulating tape. It is formed by the groove 31E and the concave groove 32E.

For this reason, the liquid impregnating resin material that is going to penetrate into the wound layer along the overlap of the insulating tape 2E is:
The impregnating liquid is impregnated through the concave groove 31E and the concave groove 32E, and is substantially the same as that of the stator coil having the wound layer formed by winding the insulating tape 2D shown in FIG. The permeability of the resin material can be obtained. The advantage of using the insulating tape 2E over using the insulating tape 2D is that the winding speed of the insulating tape 2E can be faster than that of using the insulating tape 2D. The reason for this is that the insulation tape 2E
This is because the deformation of the groove when the insulating tape is wound is relatively small by not having the groove 32D formed across the width direction of the insulating tape 2D.

That is, by using the insulating tape 2E, the production cost can be reduced while maintaining the operation and effect obtained by the stator coil using the insulating tape 2D. In FIG. 13, the measurement result obtained for the stator coil using the insulating tape 2E is shown as a graph drawn by a thick two-dot chain line. According to the measurement results, it has been confirmed that the penetration rate of the impregnating resin material is further improved as compared with the case of the stator coil according to the present invention using the insulating tape 2C.

FIG. 7 is a cross-sectional view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. 7, reference numeral 2F denotes a ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS.
The insulating tape 2 used for the mica sheet layer 3
And an insulating tape using the mica sheet layer 3C and the adhesive layer 4F instead of the adhesive layer 83, respectively. The adhesive layer 4F is different from the adhesive layer 83 only in that no adhesive is added to the portion where the concave groove 31C is formed. Such an adhesive layer 4F may be formed by dropping the resin solution used for the insulating tape 2 onto the base material 81, for example, by setting the opening of the resin solution dropping pipe to the portion where the concave groove 31C is not formed. The resin solution is disposed corresponding to each of the portions to be bonded, and the amount of the resin solution to be dropped is set so that the adhesive layer is not formed in the zone where the portion where the concave groove 31C is formed is bonded. Thus, it can be manufactured.

A coil (stator coil) for a rotating electric machine according to a different example of the embodiment of the present invention using the insulating tape 2F shown in FIG. 7 has the above-described configuration, so that the insulating tape 2F is fixed to the present invention. The wound layer wound in the same manner as the case of the insulating tape 2 in the child coil 1 penetrates in the direction perpendicular to the surface of the insulating tape 2F, as compared with the wound layer formed by winding the insulating tape 2C. It becomes possible to improve the permeability of the liquid impregnating resin material with respect to the permeation path. By the way, it is known that the adhesive layer for bonding the base material 81 and the mica sheet layer 3 has the following two main effects on the permeability of the liquid impregnating resin material.

That is, the existence of the adhesive layer itself is
This is to be an impeding element to the penetration of the liquid impregnating resin material.For example, the impregnating resin material is an epoxy resin using an acid anhydride as a curing agent, and the adhesive used for the adhesive layer is solid. In the case of a mixture of an epoxy resin and a liquid epoxy resin, the impregnating resin material reacts with the adhesive to increase its viscosity. In the insulating tape 2F, by limiting the formation range of the adhesive layer that impairs the permeability of the liquid impregnating resin material, the liquid impregnating resin material relating to the permeation path that permeates in the direction perpendicular to the surface of the insulating tape 2F is formed. The permeability can be improved as compared with the case where the insulating tape 2C is used. That is, the insulating tape 2
By using F, the generation of voids is further reduced while maintaining the operation and effect obtained by the stator coil using the insulating tape 2C, and the electrical insulation performance and long-term reliability can be further improved.

FIG. 8 is a cross-sectional view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. In FIG. 8, 2G denotes a ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS.
The insulating tape 2 used for the mica sheet layer 3
And an insulating tape using the mica sheet layer 3C and the adhesive layer 4G in place of the adhesive layer 83, respectively. The adhesive layer 4G is different from the adhesive layer 83 only in that no adhesive is added to a portion where the concave groove 31 is not formed. Such an adhesive layer 4G is applied to a method of dropping the resin solution used for the insulating tape 2 onto the base material 81, for example, by sticking the opening of the pipe for dropping the resin solution to the portion where the concave groove 31C is formed. Along with disposing corresponding to each part to be combined,
The resin solution can be manufactured by setting the drop amount of the resin solution so that the portion where the concave groove 31C is not formed is bonded and the adhesive layer is not formed in the zone.

In the case of the groove 31C formed by the pressing method using a roller, the density of the mica pieces is higher in the portion where the groove 31C is formed than in the portion where the groove 31C is not formed. Is getting higher. For this reason, regarding the permeability of the liquid impregnating resin material with respect to the permeation path permeating in the direction perpendicular to the surface of the insulating tape 2G, the part where the concave groove 31C is formed is the part where the concave groove 31C is not formed. Worse than. Focusing on this, the insulating tape 2G limits the formation range of the adhesive layer that inhibits the permeability of the liquid impregnating resin material to a portion where the concave groove 31 is formed, thereby providing the liquid impregnating resin material. Groove 3 with excellent permeability of resin material
A portion in which 1C is not formed is actively used to make the liquid impregnating resin material permeate.

As a result, the permeability of the liquid impregnating resin material with respect to the permeation path permeating in the direction perpendicular to the surface of the insulating tape 2G can be improved as compared with the case where the insulating tape 2F is used. That is, the use of the insulating tape 2G further reduces the generation of voids while maintaining the operation and effect obtained by the stator coil using the insulating tape 2C, and further improves its electrical insulation performance and long-term reliability. be able to. In FIG. 13,
The measurement results obtained for the stator coil using the insulating tape 2G are shown as a graph drawn with a thick dotted line. According to the measurement results, it has been confirmed that the penetration rate of the impregnating resin material is further improved as compared with the case of the stator coil according to the present invention using the insulating tape 2E.

FIG. 9 is a cross-sectional view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. In FIG. 9, reference numeral 2H denotes a ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS.
The insulating tape 2 used for the mica sheet layer 3
And an insulating tape using the mica sheet layer 3C and the hardening accelerator addition layer 5H in place of the hardening accelerator addition layer 84, respectively. When the additive layer 5H is compared with the additive layer 84, the additive layer formed in a portion other than the concave groove 31C has a small amount of the curing accelerator added, and
The only difference is that the addition amount of the curing accelerator is made different in accordance with the concave groove 31C so that the addition amount of the curing accelerator is increased in the additive layer formed in C.

The addition layer 5H can be formed by dropping a curing accelerator solution (the content of the curing accelerator is the same as that of the curing accelerator solution used for the insulating tape 2 and the concentration of the curing accelerator is different) onto the mica sheet layer 3C, for example. The openings of the pipe for dropping the curing accelerator solution are arranged in correspondence with the concave groove 31C and the intermediate part with respect to the concave groove 31C, respectively.
After setting the concentration of the curing accelerator of the curing accelerator solution to the portion of the concave groove 31C to be higher than the concentration of the curing accelerator to the intermediate portion, an equivalent amount of the curing accelerator solution is dropped. Can be made.

A coil (stator coil) for a rotating electric machine according to a different example of the embodiment of the present invention using the insulating tape 2H shown in FIG. 9 has the above-described configuration. The wound layer of the stator coil 1 wound in the same manner as the case of the insulating tape 2 is substantially the same as the case of using the insulating tape 2F, as compared with the wound layer of the stator coil 1, It becomes possible to improve the permeability of the liquid impregnating resin material with respect to the permeation path permeating vertically to the surface of the insulating tape 2H.

As for the liquid impregnating resin material that penetrates through the concave groove 31C, the viscosity of the impregnating resin material is increased by the reaction of the curing accelerator because the amount of the curing accelerator added to the concave groove 31C is large. And the permeation rate of the resin material for impregnation decreases. However, the reverse relationship improves the retention of the impregnating resin material, thereby preventing resin leakage. That is, the use of the insulating tape 2H further reduces the generation of voids while maintaining the operation and effect obtained by the stator coil using the insulating tape 2C, and further improves the electrical insulation performance and long-term reliability. be able to.

FIG. 10 is a cross-sectional view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. In FIG. 10, 2J indicates the addition of the mica sheet layer 3 and the curing accelerator to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS. Instead of the layer 84, the mica sheet layer 3C and the addition layer 5J of the curing accelerator are respectively provided.
Is an insulating tape. The additional layer 5J
Compared with the additive layer 84, the additive layer formed in a portion other than the concave groove 31C has a large amount of the curing accelerator added, and
The only difference is that the addition amount of the curing accelerator is made different in accordance with the concave groove 31C so that the addition amount of the curing accelerator is reduced in the addition layer formed in 1C.

The addition layer 5J can be formed by dropping a curing accelerator solution (the same content as the curing accelerator solution used for the insulating tape 2 and having a different concentration of the curing accelerator) onto the mica sheet layer 3C. The openings of the pipe for dropping the curing accelerator solution are arranged in correspondence with the concave groove 31C and the intermediate part with respect to the concave groove 31C, respectively.
By setting the concentration of the curing accelerator of the curing accelerator solution to the portion of the concave groove 31C to be lower than the concentration of the curing accelerator to the intermediate portion, an equivalent amount of the curing accelerator solution is dropped. Can be made.

A coil (stator coil) for a rotating electric machine according to a different embodiment of the present invention using the insulating tape 2J shown in FIG. 10 has the above-described configuration. The wound layer formed by winding in the same manner as the case of the insulating tape 2 in the slave coil 1
A liquid impregnating resin relating to a permeation path which permeates in a direction perpendicular to the surface of the insulating tape 2J, as compared with a wound layer formed by winding the insulating tape 2C, in substantially the same manner as when the insulating tape 2G is used. It becomes possible to improve the permeability of the material.

As for the liquid impregnating resin material that penetrates through the groove 31, the addition amount of the curing accelerator to the groove 31 is small, and the viscosity of the impregnating resin material is increased by the reaction of the curing accelerator. Since the degree of increase is small, the permeation rate of the impregnating resin material does not decrease much. That is, by using the insulating tape 2J, while maintaining the operation and effect obtained by the stator coil using the insulating tape 2G, the occurrence of voids is further reduced, and the electrical insulation performance and long-term reliability are further improved. be able to.

In FIG. 13 and FIG. 14, the measurement results obtained for the stator coil using the insulating tape 2J are both shown as thick dotted lines. According to these measurement results, the penetration rate of the impregnating resin material is further improved as compared with the case of the stator coil according to the present invention using the insulating tape 2G, and the content of the voids included in the electric insulating layer is also improved. It has been confirmed that the initial partial discharge maximum discharge charge amount, which means the above, is further reduced as compared with the case of the stator coil according to the present invention using the insulating tape 2C.

FIG. 11 is a cross-sectional view schematically showing an insulating tape used for a coil according to a different embodiment of the present invention. In FIG. 11, 2K indicates the addition of the mica sheet layer 3 and the curing accelerator to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIGS. Instead of the layer 84, the mica sheet layer 3C and the hardening accelerator additive layer 6K are respectively provided.
Is an insulating tape. The additional layer 6K is
A major feature is that a microencapsulated hardening accelerator, which is formed in a granular form by covering with a film made of a polymer material, is used as the hardening accelerator.

The polymer material used for the film of the microencapsulated curing accelerator has a melting point higher than the temperature at the time of the impregnation treatment of the impregnating resin material and lower than the curing temperature of the impregnating resin material. In the case of having a compatibility with the liquid impregnating resin material, it is preferable to select a material having a small reactivity alone with the curing accelerator, and the impregnating resin material is an epoxy resin material In this case, for example, a polyimide compound or polyvinyl butyral (polyethylene-
Vinyl acetate copolymer, polyvinyl acetate, etc.) can be applied. Such a microencapsulated curing accelerator is
It is provided as a trade name Novacure (manufacturer; Asahi Kasei). In the case of Novacure, the particle size is about 1 to 5
[Μm] can be selected.

When the wound layer using a microencapsulated hardening accelerator as a hardening accelerator is impregnated with a liquid impregnating resin material, the impregnating resin material comes into direct contact with the hardening accelerator during the impregnation. Therefore, the resin material for impregnation during the impregnation process does not undergo a curing reaction by the curing accelerator. Therefore, the problem that the viscosity of the impregnating resin material increases during the impregnation process due to the curing reaction is solved, and even in the case of a wound layer having a thick layer thickness, the entire wound layer is impregnated. It becomes easy to impregnate the resin material. In addition, the above-mentioned impregnation temperature is substantially unnecessary to consider the reactivity of the curing accelerator, and can be freely set within the range of less than the melting point of the polymer material used for the film of the microencapsulated curing accelerator. It can be set.

That is, when the insulating tape 2K using the microencapsulated hardening accelerator is used, the impregnation temperature can be set with emphasis on the impregnation property of the impregnating resin material. In addition, it becomes easy to impregnate the entire wound layer with the resin material for impregnation. With these features,
In the case where the insulating tape 2K is used, since the entire wound layer is well impregnated with the liquid impregnating resin material, it becomes extremely easy to improve the electrical insulation performance and the long-term reliability thereof. By the way, the hardening accelerator solution used for forming the hardening accelerator additive layer 6K of the insulating tape 2K is used to prevent damage to the polymer film of the microencapsulated hardening accelerator, for example, It is obtained by diluting with a reactive diluent (such as a low-viscosity epoxy resin).

The insulating tape 2K is the same as the insulating tape 2H as to the distribution of the amount of the hardening accelerator, except that a solution of the microencapsulated hardening accelerator is used as the hardening accelerator for the additional layer 6K. Therefore, the description is omitted to avoid duplication. Thus, the use of the insulating tape 2K further reduces the generation of air gaps while maintaining the operation and effect obtained by the stator coil 1 using the insulating tape 2, thereby improving its electrical insulation performance and long-term reliability. It can be further improved.

FIG. 12 is a sectional view schematically showing an insulating tape used for a coil according to still another example of the embodiment of the present invention. In FIG. 12, 2L corresponds to FIGS.
With respect to the insulating tape 2 used for the ground insulating layer 11 of the stator coil 1 according to the present invention shown in FIG. 3, the mica sheet layer 3 and the hardening accelerator additive layer 84 are replaced with the mica sheet, respectively. This insulating tape uses the layer 3C and the addition layer 6L of the curing accelerator. Addition layer 6
L uses a microencapsulated hardening accelerator formed by covering the hardening accelerator with a film made of a polymer material and forming a granular shape in the same manner as in the case of the insulating tape 2K. Regarding the addition amount distribution of the curing accelerator, etc.,
Since this is the same as the case of the insulating tape 2J, description thereof will be omitted to avoid duplication.

In FIG. 13, the measurement results obtained for the stator coil using the insulating tape 2L are shown as a thick solid line graph. According to this measurement result, the penetration speed of the impregnating resin material is as follows.
It has been confirmed that this is further improved as compared with the case of the stator coil according to the present invention using J. That is,
By using the insulating tape 2L, the operation and effect obtained by the stator coil using the insulating tape 2J can be maintained, the generation of voids can be further reduced, and the electrical insulation performance and long-term reliability can be further improved. it can.

In the above description, the insulating tapes 2K and 2K
The mica sheet layer provided in L uses a microencapsulated hardening accelerator as a hardening accelerator, and makes the addition amount of the hardening accelerator different between a part where a groove is formed and a part where a groove is not formed. However, the present invention is not limited to this. For example, only by using a microencapsulated curing accelerator as a curing accelerator, the amount of the curing accelerator added may be changed to the portion where the groove is formed and the groove is formed. It may be equivalent to a part that is not performed. In these cases,
Due to the above-mentioned features of the microencapsulated curing accelerator, the permeability and the retention of the liquid impregnating resin material can be increased.

In the above description, the insulating tape 2F,
Although the mica sheet layer included in 2G, 2H, 2J, 2K and 2L has been described as being the mica sheet layer 3C, the mica sheet layer is not limited to this. For example, the mica sheet layer 3, 3A, 3B, 3D or 3E may be used. It may be. Further, in the above description, the concave groove of the mica sheet layer has been described as being formed in the mica sheet layer by a pressure method.However, the present invention is not limited to this. It can also be formed by adopting a net in which unevenness corresponding to the concave groove is formed as a well-known net used when manufacturing by a similar method. However, in the mica sheet layer with a groove formed by this method, the density of the mica pieces is determined whether the mica piece is formed in the part where the groove is formed or in the part where the groove is not formed. Are equivalent. For this reason, regarding the permeability of the liquid impregnating resin material with respect to the permeation path permeating in the direction perpendicular to the surface of the mica sheet layer, the relationship is opposite to that of the mica sheet layer formed by the pressure method, The area where the groove is formed is better than the area where the concave groove is not formed.

When a mica sheet layer having a groove formed simultaneously with the production of the mica sheet is used, when the mica sheet layer is impregnated with the liquid impregnating resin material, the mica sheet layer expands to form the groove. Does not occur (already described for the mica sheet layer 3).
For this reason, it is not possible to obtain an increase in the retention due to the closing of the groove. However, since there is an effect of improving permeability due to the presence of the grooves, by increasing the addition amount of the curing accelerator than in the case of the conventional example to increase the retention by the curing accelerator, Also in this case, it is possible to simultaneously improve the permeability and the retention.

In the above description, the configuration in which the amount of the adhesive to be added is different between the portion where the concave groove is formed and the portion where the concave groove is not formed is that the amount of the hardening accelerator added is
Although the configuration in which the groove is formed is different from the region in which the groove is not formed, and the configuration in which the microencapsulated hardening accelerator is used as the hardening accelerator, it has been described that the structure is different from the configuration. The configuration is not limited thereto, and these configurations can be appropriately combined, and by adopting such a combination configuration, the permeability and the retention can be further improved.

Further, in the above description, the concave groove, which is a permeation path for facilitating the permeation of the liquid impregnating resin material, has been formed in the mica sheet. However, the present invention is not limited to this. For example, a concave groove may be formed in the base material. Especially in the case of a non-woven fabric substrate,
The groove can be formed in the base material by the same method as that for forming the groove in the mica sheet.

Further, in the above description, the addition layer of the curing accelerator has been formed on the mica sheet layer.
The present invention is not limited to this. For example, an additive layer of a curing accelerator may be formed on a substrate.

[0074]

The coil for a rotating electric machine according to the present invention has the following effects by adopting the structure described in the section of the means for solving the above problems. A liquid impregnating resin material for a wound layer formed by winding an electric insulating tape is provided by adopting the constitution according to the above means (1) or (2). By improving the permeability of the coil of the rotating electric machine,
The manufacturing cost can be reduced by improving the electrical insulation performance and its long-term reliability, and by using a common electrical insulating tape. In addition, by adopting the configuration according to item (3) of the means for solving the above problems, the permeability of the liquid impregnating resin material from the overlap of the electric insulating tape is further improved, and the rotation is achieved. It is possible to further improve the electrical insulation performance and the long-term reliability of the coil for electric machines. In addition, by adopting the configuration according to item (4) of the means for solving the above problems, the permeability of the liquid impregnating resin material from the overlap of the electrical insulating tape is further higher than that in the above item. This improves the electrical insulation performance and long-term reliability of the coil for the rotating electric machine. In addition, by adopting the configuration according to the mode (5) of the means for solving the above problems, the concave groove is closed when the liquid impregnating resin material is impregnated, so that the electric insulation is achieved. The holding property of the liquid impregnating resin material in the wound layer around which the tape is wound is improved, and the electric insulation performance and long-term reliability of the coil for the rotating electric machine can be further improved. In addition, by adopting a configuration according to the above-mentioned means (6) and (7) for solving the problem, the transmittance in a direction perpendicular to the surface of the electrical insulating tape is increased. Therefore, the permeability of the liquid impregnating resin material in the wound layer around which the electric insulating tape is wound will be further improved,
It is possible to further improve the electrical insulation performance and the long-term reliability of the coil for the rotating electric machine. Still further, by adopting the configuration according to item (8) of the means for solving the above problems, the occurrence of a curing reaction by a curing accelerator during the impregnation of the liquid impregnating resin material is prevented. As a result, the permeability of the liquid impregnating resin material in the wound layer around which the electric insulating tape is wound is further improved, and the electric insulation performance and the long-term reliability of the coil for the rotating electric machine are remarkably improved. Improvement is possible.

[Brief description of the drawings]

1A and 1B are drawings schematically showing a coil according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view thereof, and FIG.
(A) Sectional view of the electrical insulating tape used in the indicated coil

FIG. 2 is a top view of the electrical insulating tape according to FIG. 1 (b).

FIG. 3 is an explanatory view for explaining a method of forming a concave groove of the electric insulating tape shown in FIGS. 1 and 2;

FIG. 4 is a drawing schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention;
Is a cross-sectional view when the groove formed in the mica sheet layer has a semicircular cross section, and (b) is a cross-sectional view when the groove formed in the mica sheet layer has a triangular cross section.

FIG. 5 is a top view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 6 is a drawing schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention;
Is a top view of an insulating tape in which concave grooves are formed in a lattice shape,
(B) is a top view of the insulating tape in which the concave groove is formed in an oblique cross shape.

FIG. 7 is a sectional view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 8 is a sectional view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 9 is a sectional view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 10 is a sectional view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 11 is a sectional view schematically showing an insulating tape used for a coil according to a different example of the embodiment of the present invention.

FIG. 12 is a cross-sectional view schematically showing an insulating tape used for a coil according to still another example of the embodiment of the present invention.

FIG. 13 is a graph showing a measurement example of a rate of increase in capacitance of a ground insulating layer during impregnation processing of various stator coils according to the present invention with a resin material for impregnation in comparison with a conventional example.

FIG. 14 is a graph showing a measurement example of an initial partial discharge maximum discharge charge amount for various stator coils according to the present invention in comparison with a conventional example.

FIG. 15 is a cross-sectional view schematically showing a part of a conventional coil for a rotating electric machine together with peripheral devices.

FIG. 16 is a sectional view schematically showing an insulating tape used for the coil shown in FIG. 15;

FIG. 17 is an explanatory diagram illustrating a situation in which a void remains in the ground insulating layer of the stator coil.

[Explanation of symbols]

 Reference Signs List 1 coil (stator coil) 11 electric insulating layer (ground insulating layer) 2 electric insulating tape 3 mica sheet layer 31 concave groove 81 base material 83 adhesive layer 84 addition layer

Claims (8)

[Claims] An electric insulating tape formed by winding an electric insulating tape covering at least a part of an outer periphery of a coil portion so as to surround a coil portion formed using a wire and an outer periphery of the coil portion. An electrical insulating layer obtained by impregnating and curing a liquid impregnating resin material in the wound layer, and the electrical insulating tape is a tape-shaped base material using a fiber material made of an electrical insulating material, A tape-shaped mica sheet layer bonded to a base material using an adhesive, and an addition layer of a curing accelerator for promoting a curing reaction of the impregnating resin material applied to the base material and / or the mica sheet layer; Wherein the electric insulating tape is formed with a permeation path for facilitating the penetration of the liquid impregnating resin material into the winding layer. Coil. 2. The coil for a rotating electric machine according to claim 1, wherein the permeation path is a concave groove formed in a base material and / or a mica sheet layer. coil. 3. The coil for a rotating electric machine according to claim 2, wherein a plurality of the grooves are formed at intervals in a length direction of the electrical insulating tape so as to cross a width direction of the electrical insulating tape. A coil for a rotating electric machine, characterized in that it is made. 4. The coil for a rotating electric machine according to claim 2, wherein said grooves are formed by two groups of grooves formed at intervals from each other, and each groove group is formed by said grooves. A groove for a rotating electric machine, characterized in that the grooves provided in the coil are arranged so as to intersect with the grooves belonging to another groove group. 5. The coil for a rotating electric machine according to claim 2, wherein the concave groove is formed in the base material and / or the mica sheet layer by a pressurizing method. For rotating electric machines. 6. The coil for a rotating electric machine according to claim 2, wherein the adhesive is formed by forming a portion of the electric insulating tape where the concave groove is formed, and a concave groove. A coil for a rotating electric machine, characterized in that the amount of addition is different for a portion that is not provided. 7. The coil for a rotating electric machine according to claim 2, wherein the additional layer of the curing accelerator comprises a portion of the electrical insulating tape where the groove is formed, and a groove. A coil for a rotating electric machine, characterized in that the addition amount of a curing accelerator is made different from a portion where no is formed. 8. The coil for a rotating electric machine according to claim 1, wherein the curing accelerator has a melting point lower than a curing temperature of the resin material for impregnation. A coil for a rotating electric machine, wherein the coil is formed in a granular form by covering with a layer of a molecular material.