JP3214596B2 - Method for manufacturing rotating electric machine insulation coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an insulating coil of a rotating electric machine, and more particularly to a method of manufacturing an insulating coil by fully impregnating insulation of a stator coil inserted into a slot of an iron core of the rotating electric machine.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show the shape of a rotating machine insulating coil. FIG. 8 is a sectional view of a high-voltage rotating machine insulating coil in which the insulating layer of the insulating coil is a mica tape layer.
FIG. 9A is a cross-sectional view of a low-voltage rotating electric machine insulating coil. FIG. 9A shows an insulating coil in which a ground insulating layer of the insulating coil is formed of a film layer, and FIG. . As a method of manufacturing an insulating coil for a rotating electric machine, there is a full impregnation insulating method in which an insulating coil is inserted into an iron core slot, and the insulating coil and the iron core are integrally impregnated with resin and cured. As shown in FIG. 8, the stator insulating coil of the high-voltage rotating electric machine is formed by winding a wire conductor on which wire insulation has been performed a plurality of times to produce a wire conductor bundle 2. Unimpregnated insulation not impregnated with a resin formed by winding a mica insulating tape or sheet in which a woven fabric or film made of glass fiber or the like is bonded to a mica foil having excellent properties as a backing material to form a ground insulating layer 3 The coil 14 is inserted into the iron core slot 201 together with the sub-materials such as the interphase insulation 19 and the wedge 22, and after connecting the insulating coils 14, the coil is housed in a resin impregnation tank, and the impregnated resin is impregnated with vacuum and pressure. After that, it is taken out of the resin impregnation tank and cured in a heating and curing furnace to produce it. In addition, the insulating coil 14 and the iron core slot 20 of the high-voltage rotating electric machine are used.
1, a surface corona prevention layer 4 having a low resistance is provided to prevent the occurrence of partial discharge (corona discharge) due to poor electrical contact. The method of manufacturing an insulated coil by the fully impregnated insulation method is that the resin is sufficiently impregnated into the ground insulating layer 3 so that a dense insulating layer can be obtained, high reliability of insulation can be achieved, and the number of manufacturing steps can be reduced. Therefore, the insulation coil of a high-voltage rotating electric machine to which a high voltage is applied is applied from a small machine to a large machine.

[0003] As described above, the stator insulating coil of the high-voltage rotating electric machine has a gap, which causes partial discharge, in the ground insulating layer 3 after being impregnated with resin and heated and hardened due to application of a high voltage. It is necessary to form a homogeneous insulating layer without any defects.
By the way, in the manufacturing method of the insulating coil by the full impregnation insulation method, since the impregnated resin is used repeatedly, in order to avoid impregnation failure to the ground insulating layer due to the increase in the viscosity of the impregnated resin at the time of impregnation, a stable resin with a small increase in viscosity is used. In the method of heating and lowering the viscosity of the impregnated resin and performing total impregnation, the impregnated resin is composed of a thermosetting resin composed of an epoxy resin or the like and a curing agent, and promotes a curing reaction by heating. A resin system not containing a curing accelerator is used. In this case, the mica insulating tape constituting the ground insulating layer 3 is subjected to a curing accelerator that promotes the heat curing reaction with the resin system described above, and only the impregnated resin impregnated in the ground insulating layer 3 during heat curing is cured. Try to accelerate the reaction. In order to avoid an increase in viscosity due to heating of the impregnated resin, in a method of impregnating at a low temperature (30 to 40 ° C.) near room temperature, a low-viscosity resin composed of a thermosetting resin such as an epoxy resin and a curing agent as the impregnating resin is used. A curing system having a low curing reactivity at room temperature and a high curing reactivity at a high temperature of heat curing is used. The total impregnation method of heating and impregnating the impregnated resin to a low viscosity is mainly applied to insulation of large machines, and the method of fully impregnating at room temperature is mainly applied to insulation of small and medium machines. I have.

However, in the above-mentioned total impregnation method using an impregnating resin at room temperature, the insulating coil is impregnated with the impregnating resin in the impregnating resin tank integrally with the iron core, and then the resin is heated in a high-temperature atmosphere in a heat-curing furnace. In the impregnation step of curing, the resin impregnated in the ground insulating layer 3 leaks from the surface of the insulating coil when the viscosity of the resin lowers before the heat-curing reaction of the resin when the temperature of the insulating coil rises. 9 may occur. For this reason, as in the case of the above-described method of manufacturing an insulating coil in which the impregnated resin is entirely impregnated at room temperature by heating the impregnated resin to a low viscosity, the mica insulating tape constituting the ground insulating layer 3 is impregnated with the impregnated resin. A hardening accelerator for further accelerating the heat hardening reaction with the ground insulating layer 3
The heat-curing reaction of the impregnated resin impregnated therein is accelerated to prevent the resin from leaking from the surface of the insulating coil after the resin impregnation.

In order to prevent the impregnated resin from leaking from the insulating layer of the insulating coil, the core 20 and the insulating coil 14 impregnated with the resin are taken out of the impregnated resin tank and transferred to a heat-curing furnace. A solution containing a curing accelerator for accelerating the heat curing of the coil is sprayed on the surface of the insulating layer at the coil end outside the core, and the impregnated resin at the outermost layer of the coil end is cured to impregnate the ground insulating layer 3 with the coil. It has also been practiced to prevent leakage through the end.

The full impregnation insulation method can improve the thermal conductivity of a coil insulation layer by integrally impregnating and hardening a resin, and can form a uniform insulation film even in an insulation coil of a low-voltage rotating electric machine. Therefore, the impregnation method is adopted for many models because the environmental resistance can be improved, and this impregnation method is also adopted because the above-described total impregnation method in which the resin is impregnated at room temperature can reduce the number of manufacturing steps of the insulating coil. Often. FIG. 9A shows a film conductor or a woven cloth formed on a wire conductor bundle 21 in which a wire conductor having a rectangular cross section is wound a plurality of times in the same manner as the wire conductor bundle of the stator insulating coil of the high-voltage rotating electric machine. Winding a tape or sheet made of
2 is a low-voltage insulating coil made of a so-called coil wound coil. In this case, the insulating coil is also impregnated by the full impregnation method in which the non-impregnated insulating coil 15 inserted into the iron core slot 202 is impregnated with resin in the same manner as described above. Make it.

FIG. 9 (b) shows a spirally wound coil using an enameled wire as a strand conductor. In order to improve the environmental resistance to the above-mentioned external moisture and polluted atmosphere, the enamelled coil is used. A glass fiber-coated enameled wire 18 further provided with a glass fiber-coated layer 17 as a wire insulation on the outer layer of the wire 10 is inserted into the core slot 203 by inserting an insulated coil 16 in which a wire conductor is wound a plurality of times. And an insulating structure in which a resin layer is formed on the surface layer 15 by the resin retention of the glass fiber coating layer 17 described above.

[0008]

In the above-mentioned stator insulating coil of a high-voltage rotating electric machine which is completely impregnated with an impregnating resin at room temperature, the stator insulating coil is provided on the ground insulating layer as a measure for preventing resin leakage from the ground insulating layer. The curing accelerator amount is uniformly applied to the insulating tape constituting the ground insulating layer. At this time, in order to prevent leakage from the coil insulating layer due to the flow of the impregnated resin due to the decrease in viscosity in the heating and curing furnace, if the processing amount of the curing accelerator of the insulating tape is increased, the impregnated resin penetrates into the insulating layer. This causes a decrease in the properties and causes impregnation failure of the resin.
Also in the case of appropriate amount treatment, in the impregnation process of the impregnating resin, the curing accelerator flows together with the impregnating resin in the ground insulating layer, and a portion of the insulating layer in which the proportion of the attached amount of the curing accelerator is large occurs, The curing reaction of the resin in this portion starts before the completion of the resin impregnation, the viscosity increases, and the impregnation of the resin into the insulating layer may be hindered. Resin leakage and resin impregnation failure from these insulating layers may cause the formation of voids 9 in impregnation failure in the ground insulating layer 3 in FIG. Therefore, the resin impregnated in the insulating layer uniformly cures by controlling the amount of the curing accelerator applied to the mica insulating tape and changing the amount of adhesion in the thickness direction of the insulating layer. In addition, there is a problem in that the man-hours required for the insulation treatment for manufacturing the insulated coil are complicated, and the manufacturing workability is inferior.

The method of spraying a solution of a curing accelerator onto the end of the insulating coil after the impregnation of the resin also has the effect of preventing the resin from leaking at the coil end.
It is not possible to completely prevent leakage of the resin in the ground insulating layer 3 to which a high voltage is applied in the iron core slot 201 in FIG.
Further, there is a problem that it is necessary to take measures so as not to adversely affect the manufacturing environment due to the scattering of the solution during the spraying operation of the solution of the curing accelerator.

Further, in the method of manufacturing an insulating coil by the full impregnation method in the low-voltage rotating electric machine, similarly to the insulating coil of the high-voltage rotating electric machine, a ground insulating layer of the type-wound coil shown in FIG. It is difficult to completely prevent the impregnated resin from leaking out of the coil wound and the wire insulation made of the glass fiber coating layer 17 and the like in FIG.
Due to the generation of the voids 9 in the ground insulating layer 32 and the leakage of resin from between the glass fiber-coated enameled wires 18, voids may be generated between the wire conductors inside the coil 16, which may adversely affect the insulation performance. There was a problem that.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the resin from being leaked from an insulating layer of a resin-impregnated insulating coil in an insulating coil of a rotary electric machine of a full impregnation method in which a resin is impregnated at room temperature to generate a void. It is an object of the present invention to provide an insulating coil having excellent insulation performance without any problem .

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a ground insulation obtained by applying a curing accelerator to a wire conductor bundle formed by winding a wire conductor having wire insulation a plurality of times. The unimpregnated insulated coil formed with the layer is accommodated in the core slot, and the unimpregnated insulated coil and the iron core are connected to a thermosetting resin.
Integrally impregnated at room temperature with impregnating resin consisting of fat and hardener
Then, in a method of manufacturing a rotating electrical machine insulating coil obtained by heating and curing , the particle-like latent
When the impregnating resin is dispersed and mixed with the impregnated resin,
The latent curing accelerator remains on the surface of the ground insulating layer
And then melted in the process of heating and curing the impregnated resin.
Curing with the thermosetting resin by the latent curing accelerator
Due to the curing reaction with the agent, the outermost layer of the ground insulating layer
A leakage prevention layer is formed.
1) .

The latent curing accelerator according to claim 1,
Is a tree that is melted by heating during the heat curing of the impregnated resin.
Microencapsulated by covering the surface with fat
(Claim 2).

Further, according to claim 1, the ground insulating layer is formed.
The outermost layer of non-impregnated insulating coil form, it is preferable Ru provided an adsorption layer for adsorbing latent curing accelerator of the impregnation resin (請
Claim 3).

In this case, the adsorbing layer can be made of an inorganic material, an organic fiber, or a composite material thereof.
(Claim 4).

A non-impregnated insulated coil formed by winding a single wire conductor having a wire insulation or a plurality of turns is accommodated in a core slot, and the unimpregnated insulated coil and the iron core are thermoset.
After integrally impregnated at room temperature in the impregnating resin comprising a resistance resin and hardener, in the production method of a rotating electric machine insulation coil formed by heat curing, the particles to melt by heating in the impregnating resin
As well as dispersed and mixed the latent curing accelerator shape of Jo, the adsorption layer is provided to adsorb the <br/> latent curing accelerator in the outermost layer of said wires insulation impregnated with this impregnating resin, the impregnation Tree
The latent curing accelerator is adsorbed to the adsorption layer during the impregnation of fat.
And then melted in the process of heating and curing the impregnated resin.
In addition, the latent curing accelerator is used to harden the thermosetting resin.
To promote the curing reaction with the agent
Claim 5). In this case , the latent curing accelerator is covered with a resin that is melted by heating to cover the surface of the microcapsule.
It is better to be made

[0017]

According to the present invention , a curing agent is blended with a thermosetting resin.
The impregnated resin promotes latent hardening in the form of particles that melt when heated.
In the stator coil insulation of a high-pressure rotating machine, the unimpregnated insulating coil on which a ground insulating layer provided with a hardening accelerator is impregnated by a full impregnation method. This allows
During the resin impregnation, the latent curing accelerator remains and adsorbs on the outermost insulating layer of the insulating coil. After the resin impregnation, the temperature rises when the insulating coil is heated and cured in a heating and curing furnace.
The latent curing accelerator is melted to initiate a curing reaction of the resin impregnated in the outermost layer of the insulating coil, and when the temperature reaches the heat curing temperature, the outermost insulating layer is in a state where the heat curing is completed. . In addition, the resin impregnated into the insulating layer, the curing accelerator applied to the insulating tape, the curing reaction between the resin and the curing agent proceeds, even if the resin viscosity before the curing reaction decreases, As described above, the resin of the outermost insulating layer is cured to form the resin leakage prevention layer, so that the impregnated resin does not leak to the outside through the insulating surface layer, and therefore, the voids inside the insulating layer are removed. The occurrence is prevented.

Furthermore, the outermost layer of the insulating coil is composed of an inorganic material, an organic fiber, a composite material thereof, etc.
The latent curing accelerator is eliminated by providing an adsorbent layer for the agent.
Effectively retains and remains on the outermost layer of the edge layer, preventing resin leakage
Can be reliably formed.

Also, a ground insulation made of film or woven fabric
Stator for low-voltage rotating electric machine consisting of layer-formed coil
Also in the insulating coil, similarly to the stator insulating coil of the high-voltage rotating electric machine, by providing an adsorption layer that adsorbs the latent curing accelerator of the impregnated resin to the outermost layer of the ground insulating layer, the outermost layer of the insulating layer In addition to forming a resin leakage prevention layer, since the thickness of the ground insulating layer is relatively thin, the latent curing accelerator adsorbed by the adsorbing layer accelerates the curing reaction of the impregnated resin in the insulating layer, thereby forming a void in the insulating layer. Occurrence can be prevented.

Also, in an insulating coil of a low-voltage rotating electric machine of a turbulent coil composed of a glass fiber-coated enameled wire as a wire conductor , the glass fiber layer covering the enameled wire adsorbs the latent curing accelerator of the impregnated resin. Perform the function of layer,
It is possible to form a dense coil having no gap between the strand conductors.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. Embodiment 1 FIG. 1 is a sectional view of a stator insulating coil 1 of a high-voltage rotating electric machine according to a first embodiment of the present invention. Although the figure shows only the insulating coil made of the ground insulating layer in which the corona prevention layer in FIG. 8 is omitted, the same reference numerals are used for the same parts as in the related art including the following embodiments. Detailed description is omitted. In FIG. 1, a ground insulating layer 3 of an insulating coil 1 is formed by winding a mica tape in which a glass woven fabric is bonded to a mica laminated as a backing material on a wire conductor bundle 2 formed by winding a wire conductor in a plurality of steps, a predetermined number of times. It is configured.
A predetermined amount of an accelerator for accelerating the heat curing reaction of an impregnated resin composed of a resin composition of an epoxy resin and an acid anhydride curing agent, which will be described later, is adhered to the mica tape. The accelerator can be selected from metal salts, imidazoles and tertiary amines. As described above, the coil is wound around the surface corona prevention layer in the iron core slot and inserted and installed together with the interphase insulation and the auxiliary materials such as wedges (FIG. 8).
reference).

The impregnating resin for integrally impregnating the insulating coil 1 and the iron core inserted in the above-mentioned iron core slot with resin is prepared by mixing bisphenol A or bisphenol F type epoxy resin with an acid anhydride curing agent. Novacure HX3742 (manufactured by Asahi Kasei Kogyo Co., Ltd.) having a particle size of several μm in which an imidazole-based latent curing accelerator was microencapsulated was dispersed and mixed in the thermosetting resin thus obtained. The impregnated resin made of this compounded resin is placed in an impregnation tank together with the above-described insulating coil 1 together with an iron core, impregnated at 40 ° C. by vacuum / pressure impregnation, taken out of the impregnation tank, and heated and cured by a heating and curing furnace.
It was cured by heating at 0 ° C. to produce a stator insulating coil. FIG.
As shown in the figure, the outermost insulating layer 4 of the ground insulating layer 3 is provided with a latent curing accelerator of a resin impregnated into a glass woven fabric which is a backing material of the mica laminated which constitutes the ground insulating layer 3. The coating layer which adheres and is microencapsulated in a heating atmosphere of 80 ° C. or more is melted, whereby a heat curing reaction between the latent curing accelerator, the impregnated resin and the curing agent is promoted, and the resin is cured to prevent the leakage-preventing cured resin layer 5. Is formed. Thereby, the ground insulating layer 3 at the heating temperature at the time of heat curing of the insulating coil 1 is formed.
The resin impregnated in the ground insulating layer 3 does not leak from the outermost insulating layer 4 of the insulating coil 1 even if the viscosity of the impregnated resin in the inside of the insulating coil 3 is reduced before the curing reaction. The insulating coil 1 having the ground insulating layer 3 can be formed.

Embodiment 2 FIG. 2 is a sectional view of a stator insulating coil of a high-voltage rotating electric machine according to a second embodiment of the present invention. The difference from the ground insulating layer 3 of the first embodiment of the present invention is that an adsorbing layer 6 for adsorbing a latent hardening accelerator in the form of particles of an impregnated resin is newly provided on the outer periphery of the ground insulating layer 3. That is. The latent hardening accelerator adsorbing layer 6 may be any insulating material that is impregnated with the impregnating resin and supplements the microencapsulated latent hardening accelerator having the above-described particle size. Inorganic materials such as mica tape , ara
Organic material consisting of mid-woven fabric and polyester fiber tape
Cloth or glass cloth made of these composite materials
Lamid nonwoven fabric and glass cloth-polyester fiber mixed weave
Cloth or the like is formed on the suction tape 7 as shown in FIG.
It is to be used. The composite suction tape 9 shown in FIG. 3B is obtained by improving the mechanical strength when wound on the suction tape 7 shown in FIG. 3A using the film base material 8 as a backing material. . As the film substrate 8, a polyethylene terephthalate film, a polyethylene naphthalate film, a polyimide film, and a polyamide film can be used.

[0024] The second latent curing accelerator adsorption layer 6 of impregnating resin in the embodiment of the insulated coil of unimpregnated was further wound glass cloth tape on ground insulating layer 3 in FIG. 3 (a) 11
And NOVACURE HX374 having a particle size of several μm in which the above-mentioned imidazole-based latent curing accelerator is microencapsulated.
This was prepared by the same impregnation and heat-curing conditions as in Example 1 using the impregnating resin in which No. 2 was dispersed and mixed, and by full impregnation. In the insulating coil having this configuration, the latent curing accelerator is supplemented by the latent curing accelerator adsorbing layer 6 provided on the outermost layer of the ground insulating layer 3, and the curing reaction between the impregnated resin and the curing agent is promoted. Since the resin is cured and the leak-preventing cured resin layer 5 is formed, the resin impregnated in the ground insulating layer 3 is prevented from leaking, and an insulating layer without voids is obtained.

FIG. 4 shows an insulated coil 1 according to the first embodiment of the present invention, which is insulated at a rated voltage of 6 kv class.
The partial discharge starting voltage characteristics of the insulating coil 11 according to the second embodiment are compared with the characteristics of the insulating coil 14 manufactured by the conventional impregnation resin according to the present invention, which does not use a latent curing accelerator, by the full impregnation method. It is compared and shown. The insulating coils 1 and 11 according to Example 1 and Example 2 have significantly improved both the partial discharge starting voltage and the maximum discharge charge amount in the coil insulating layer as compared with the conventional insulating coil 14, and the results are shown by a microscope. Observation of the cross section of the insulating coil also confirmed that a dense insulating layer was formed without generation of large voids. It should be noted that the properties of the insulating coil 11 provided with the adsorption layer supplementing the latent curing accelerator of the impregnated resin according to Example 2 are better, and the effect of preventing the impregnated resin from leaking from the insulating layer is great. Understand.

Embodiment 3 FIG. 5 is a cross-sectional view of a stator insulated coil comprising a coil wound coil of a low-voltage rotating electric machine according to a third embodiment of the present invention, and corresponds to FIG. Things. In FIG. 5, a ground insulating layer 31 is formed by winding a tape made of a glass cloth-aramid nonwoven fabric a plurality of times around a wire conductor bundle 21 formed by winding a wire conductor a plurality of times. It was inserted into a slot, completely impregnated at 40 ° C. with an impregnated resin in which the above-mentioned microencapsulated latent curing accelerator was dispersed and mixed, and heated and cured at 140 ° C. Also in this case, the ground insulating layer 31
The glass cloth-aramid nonwoven fabric and the wrap portion of the tape act as a latent curing accelerator adsorbing layer of the impregnated resin to adsorb the latent curing accelerator, thereby causing a curing reaction of the impregnated resin of the outermost tape. There by curing is accelerated resin, leakproof cured resin layer 5 2 from ground insulating layer 31 is formed during the heating and curing of the impregnation resin can be obtained a void-free insulating layer.

In the stator insulating coil of the low-voltage rotating electric machine composed of this type-wound coil, the curing reaction of the resin impregnated in the glass cloth-aramid nonwoven fabric as the ground insulating layer 31 is performed similarly to the stator insulating coil of the high-voltage rotating electric machine described above. It is also possible to adopt an insulating configuration in which an accelerator for promoting the treatment is treated.

Embodiment 4 FIG. 6 is a cross-sectional view of a stator insulated coil composed of a turbulent coil of a low-voltage rotating electric machine according to a fourth embodiment of the present invention, and corresponds to FIG. Things. The insulated coil 12 shown in FIG. 5 is obtained by winding a wire conductor made of a glass fiber-coated enamel wire 18 having a glass fiber coating layer 17 provided on an enamel wire 10 and winding the wire conductor a plurality of times and inserting it into an iron core slot 203. The conductor wire insulation configuration of the conductor is the same as the conventional one. Also in the irregularly wound coil of this low-voltage rotating electric machine, the impregnating resin and the impregnating conditions were the same as those of the above-mentioned type wound coil, and the impregnation conditions were the same. By acting as a latent curing accelerator adsorbing layer of the impregnated resin and adsorbing the latent curing accelerator, the curing reaction of the impregnated resin in the glass fiber coating layer 17 of the wire conductor during heating and curing of the insulating coil 12 is prevented. Accelerated and the resin hardens. The resin impregnated around the glass fiber-coated enameled wire 18 is also accelerated by the latent curing accelerator adsorbed on the glass fiber-coated layer 17, so that the resin impregnated between the strand conductors is accelerated. Leakage can be prevented, and the insulated coil 12 having no air gap can be manufactured.

FIG. 7 shows an impregnating resin A comprising the epoxy resin according to the present invention, an acid anhydride curing agent and the above-mentioned microencapsulated latent curing accelerator, a conventional epoxy resin for room temperature impregnation and a curing agent. 4 shows the time-dependent characteristics of the viscosity when the resin and the impregnated resin B containing a curing accelerator are stored in an atmosphere at 40 ° C. The viscosity increase of the impregnated resin A according to the present invention is twice or less the initial viscosity even after 3 months, and is more stable and superior than the conventional epoxy resin B for room temperature impregnation.

[0030]

As is evident from the foregoing description, in the present invention, the impregnating resin consisting in the production method of the insulating coils of the rotary electric machine comprising a vacuum pressure method to impregnate the impregnation resin at room temperature, a thermosetting resin and a curing agent In addition, the particle
Latent hardening accelerator dispersed and mixed, all impregnated insulation
On the surface of the ground insulation layer of the coil,
Heat curing after completion of resin impregnation by leaving agent
Resin leaks into the outermost insulation layer during the process of raising the temperature in the furnace
By forming a prevention layer, the impregnated resin whose viscosity has been reduced by heating before the curing reaction is prevented from leaking outside through the insulation layer, and a coil insulation layer without voids can be obtained. That
Result, since the occurrence of the partial discharge in the gap portion of a high pressure cause deterioration of insulation of the insulation coil of the rotary electric machine to become the insulating layer can be eliminated, it is possible to provide an insulated coil having the high reliability especially, It is possible to reduce the size and increase the capacity of the rotating electric machine by improving the thermal conductivity of the coil insulating layer.

The latent hardening accelerator constituting the impregnated resin is a microencapsulated latent hardening accelerator whose surface is covered with a resin that is melted by heating. Can be made to have a high adsorptivity to the insulating base material. In addition, at room temperature, the reaction of the impregnated resin with the latent curing accelerator can be avoided without melting the microcapsules of the latent curing accelerator described above, so that the storage stability of the resin is good, and the total impregnation method of repeatedly impregnating the resin. In addition, there is an effect that the manufacturing cost can be reduced by improving the workability of manufacturing the insulated coil and reducing the waste resin.

Further, by providing an adsorbing layer for adsorbing the latent curing accelerator of the impregnated resin on the outermost layer of the insulating coil provided with the ground insulating layer, the hardened insulation for preventing the resin from leaking from the ground insulating layer is provided. The formation of the layer is more reliable.

The impregnated resin containing the latent hardening accelerator having a fine particle shape which is melted by heating, such as the above-mentioned microencapsulated latent hardening accelerator of the present invention, is formed by winding a wire conductor. It is also effective in the case of producing an insulating coil of a low-voltage rotating electric machine, comprising a wire insulation constituting a wire conductor made of a material that captures the above-described latent curing accelerator such as a glass fiber layer. It is possible to prevent the resin impregnated between the wire insulation layer and the wire conductor from leaking, and to manufacture an insulation coil without voids, thereby obtaining an insulation configuration with excellent environmental resistance even in a humid or dirty atmosphere. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stator insulating coil of a high-voltage rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a stator insulating coil of a high-voltage rotating electric machine according to a second embodiment of the present invention.

3A and 3B are configuration diagrams of a latent curing accelerator adsorbing layer of the present invention, wherein FIG. 3A is a cross-sectional view of an adsorption tape made of an organic material and an inorganic material, and FIG. FIG. 3 is a cross-sectional view of a composite suction tape in which a film substrate is attached to the suction tape of FIG.

FIG. 4 is a partial discharge starting voltage characteristic of a stator insulating coil of a high-voltage rotating electric machine provided with insulation of a rated voltage of 6 kv class according to the present invention.

FIG. 5 is a cross-sectional view of a stator insulated coil including a pattern-wound coil of a low-voltage rotating electric machine according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view of a stator insulation composed of a turbulent coil of a low-voltage rotating electric machine according to a fourth embodiment of the present invention.

FIG. 7 is a graph showing the aging characteristics of the viscosity when the impregnated resin according to the present invention is stored in an atmosphere at 40 ° C.

FIG. 8 is a sectional view of a stator insulating coil of a conventional high-pressure rotating machine.

9A and 9B are cross-sectional views of a stator insulating coil of a conventional low-voltage rotating electric machine, wherein FIG. 9A shows an insulating coil having a ground insulating layer formed of a film layer, and FIG. It is an insulating coil made of glass fiber-coated enameled wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation coil 11 Insulation coil 12 Insulation coil 13 Insulation coil 2 Element conductor bundle 21 Element conductor bundle 3 Ground insulation layer 31 Ground insulation layer 5 Leak prevention hardened resin layer 6 Latent curing accelerator adsorption layer 7 Adsorption tape 9 Composite adsorption Tape 17 Glass fiber coating layer 18 Glass fiber coating enameled wire

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-168185 (JP, A) JP-A-6-14487 (JP, A) JP-A-6-105496 (JP, A) JP-A-6-105496 225489 (JP, A) JP-A-5-292713 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 15/12 H02K 3/30 H02K 3/34

Claims (6)

(57) [Claims] 1. A shape of the ground insulating layer and the strand conductors subjected to several times by winding strand conductors beam curing accelerator having a wire insulation
The unimpregnated insulated coil thus formed is housed in a core slot, and the unimpregnated insulated coil and the iron core are hardened with a thermosetting resin.
A method for manufacturing an electrical insulation coil for a rotating electrical machine , which is integrally impregnated with an impregnating resin comprising an impregnating agent at room temperature and then heat-cured.
An accelerator is dispersed and mixed, and the impregnating resin is impregnated with the latent liquid.
Leaving a latent curing accelerator on the surface of the ground insulating layer,
The latent melted in the process of heating and curing the impregnated resin after
Hardening of the thermosetting resin and the curing agent by the resident curing accelerator
Resin leakage to the outermost layer of the ground insulating layer
A method for manufacturing a rotating electrical machine insulation coil, wherein a layer is formed . 2. The method according to claim 1, wherein said latent hardening accelerator is formed of said impregnated resin.
A method for producing a rotating electrical machine insulation coil, characterized in that the surface is covered with a resin that is melted by heating at the time of heat curing and microencapsulated . 3. The method for manufacturing a rotating electric machine insulating coil according to claim 1, wherein an adsorbing layer for adsorbing the latent curing accelerator of the impregnated resin is provided on the outermost layer of the unimpregnated insulating coil on which the ground insulating layer is formed. A method for manufacturing a rotating electrical machine insulation coil, comprising: 4. The method according to claim 3, wherein said adsorption layer is made of an inorganic material, an organic fiber, or a composite material thereof. 5. An unimpregnated insulated coil formed by winding a single wire conductor having a wire insulation or a plurality of turns is housed in an iron core slot, and the unimpregnated insulated coil and the iron core are connected to a thermosetting resin.
Integrally impregnated at room temperature with impregnating resin consisting of fat and hardener
Then, in the method of manufacturing a rotating electrical machine insulation coil obtained by heating and curing , the particulate impregnation hardened by heating the impregnated resin.
The promoter shape while dispersive mixing, the adsorption layer for adsorbing said latent curing accelerator as the outermost layer of said wires insulation impregnated with this impregnating resin is provided, before the time of impregnation of the impregnating resin
The latent curing accelerator is adsorbed to the adsorption layer, and the subsequent
The latent hardened in the process of heating and curing the impregnated resin.
Curing accelerator, the curing reaction between the thermosetting resin and the curing agent
A method for manufacturing an insulating coil for a rotating electrical machine, characterized in that a response is promoted . 6. A method of manufacturing an insulating coil for a rotating electrical machine according to claim 5, wherein said latent hardening accelerator is covered with a resin that is melted by heating to form a microencapsulation.
A method for manufacturing an insulating coil for a rotating electrical machine, characterized in that: