JP2002027697A - Stator coil of dynamo-electric machine and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator coil end, which improves the filling work efficiency of insulating compound into itself a dynamo-electric machine and has the firm structure without bonding interface. SOLUTION: Epoxy compound 7, filled by pressure into the end of a stator coil 1, is made by kneading a composition where short fibers and inorganic fillers are mixed, with denatured aliphatic polyamine as a hardener into epoxy resin. At that time, the viscosity is 50,000-1,000,000mpa.s, and the pot life is 2-8 hours, and the temperature of heating at gelatinization and hardening is 130 deg.C or under.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed coil of a rotary electric machine, and more particularly to an integrated structure of an end portion of the stator coil and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 5 and FIG.
No. 38, the end of the stator coil of the conventional turbine generator has a long structure, so that a special fixing is required to prevent damage due to electromagnetic vibration applied to the end of the stator coil. A support device for the end of the child coil is provided. In FIG. 5, 1a is a lower coil, 1b is an upper coil, 2
Is an insulating ring for holding the coil 1, 3 is a holding plate,
Reference numeral 4 denotes a seal layer arranged to prevent the insulating compounds 7a and 7b from flowing out, 5 denotes a stator core, and 6 denotes an insulating ring support. FIG. 6 is an enlarged cross-sectional view of the vicinity of the center of the coil 1 in FIG. 5, in which the insulating compound filled when the lower coil 1a is disposed is 7a, and after the insulating compound 7a is cured, the upper compound is hardened. The insulating compound filled and arranged with the coil 1b is 7b. The insulating compounds 7a and 7b may have the same composition or different compositions.

Next, a conventional method for manufacturing a coil will be described. The insulating compound 7a filled between the lower-portion coils 1a is a high-viscosity putty-like substance obtained by mixing a thermosetting resin of a thermosetting type with an inorganic filler, and is usually pushed between the coils 1a using a spatula or the like. Coil 1 all around
a, the holding plate 3 is used together with the insulating compound 7a and the sealing layer 4, and is heated to cure the insulating compound 7a, thereby fixing the lower opening coil 1a. Thereafter, the holding plate 3 is removed, the upper coil 1b is arranged, the insulating compound 7b is filled in the same manner as when the lower coil 1a is arranged, and the holding plate 3 is attached again and heated to cure the insulating compound 7b. Was.

[0004]

Since the end portions of the stator coil of the conventional rotating electric machine are constructed as described above, the filling operation of the insulating compounds 7a and 7b requires a lot of time and labor. Insulation compound 7 for lower coil 1a
Since the insulating compound 7b for the upper opening coil 1b is hardened after a is once hardened, the insulating compound 7b is hardened.
At the interface between a and 7b, a portion 7d having a weak adhesive strength is formed, and there is a problem in quality in integrally forming the entire coils 1a and 1b. In addition, since the insulating compounds 7a and 7b are adhered to the surface of the stator coil 1, there is a problem that the resistive layer for preventing corona discharge applied to the coil surface is peeled off. The stator coil end structure has many problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to simplify the formation of a stator coil end portion and to provide a high-quality stator coil end structure for a rotating electric machine. It is intended to provide a manufacturing method thereof.

[0006]

According to the present invention, there is provided a stator coil for a rotating electric machine, comprising: an epoxy compound having a coil end pressurized and filled; an epoxy resin; a modified aliphatic polyamine as a curing agent; And a composition in which an inorganic filler is mixed, and has a viscosity of 5 at room temperature.
The pot life is 2 to 8 hours at 000 to 1,000,000 mpa · s, and the heat generation temperature during gelation and curing is 1
The temperature was 30 ° C. or less.

An insulating ring is provided on the outer peripheral side of the coil end, and a holding member is provided on the inner peripheral side.
A method of manufacturing a stator coil for a rotating electric machine, in which an epoxy compound formed of a composition obtained by mixing an epoxy resin and a modified aliphatic polyamine as a curing agent, a short fiber and an inorganic filler is filled under pressure, and then cured and integrated. To provide.

Further, a modified aliphatic polyamine as a curing agent is obtained by combining Epomate RD-1 (manufactured by Yuka Shell) and EpiCure TO184 (manufactured by Yuka Shell).

Further, the modified aliphatic polyamine as a curing agent is Epomate RD-1 (manufactured by Yuka Shell Co., Ltd.).

[0010] Further, on the coil surface at the end of the stator coil,
A tape treated with a heat-resistant adhesive is provided.

Further, a spacer is provided between adjacent coils at the ends of the stator coils.

The spacer is a polyester mat impregnated with an epoxy resin.

The spacer is a polyester laminate wrapped with a polyester mat and impregnated with epoxy resin.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1a is a lower coil, 1b is an upper coil, 2 is an insulating ring, 3 is a presser, 4 is a seal layer, 5 is a stator core, 6 is an insulating ring support, and 7 is a characteristic feature of the present invention. The epoxy compound 10 is a casting pump for pressure-filling the epoxy compound. FIG. 2 is a plan view of FIG. 1 as viewed from the inner diameter side, and shows the condition of the adhesive tape 1c mounted on the surface of the coil 1 and the epoxy compound 7 filled. FIG. 3 is a sectional view taken along line xx of FIGS. 1 and 2. FIG. 4 shows a spacer 8 obtained by impregnating a polyester mat inserted between stator coils 1a or 1b with an epoxy resin.
Is filled with the epoxy compound 7. Next, the operation will be described. As shown in FIG. 1, the casting pump 10 allows the lower coil 1 a and the upper coil 1 to be located between the insulating ring 2 and the lower coil 1 a, between the lower coils 1 a, respectively.
After the epoxy compound 7 is press-pressed into each gap between the upper coil 1b and the holding member 3 between the b and the upper coil 1b and between the upper coil 1b, the epoxy compound 7 is cured at room temperature for 2 to 8 hours, and the whole is integrated. Formed. In the first embodiment, the epoxy compound 7 is a liquid epoxy resin at room temperature, a modified aliphatic polyamine liquid at room temperature is used as a curing agent, and inorganic or organic fibers are cut into short fibers of about 0.1 to 6 mm, silica, A commonly known inorganic filler such as calcium carbonate, hydrated alumina or the like is blended to give a viscosity of 50,0 when mixed.
A mixture adjusted to the range of 00 to 1,000,000 mpa · s is used. This epoxy compound 7
Is characterized in that the resin and the curing agent are selected so that the resin gels and cures in 2 to 8 hours at room temperature. In particular, one or two types of modified aliphatic polyamines are combined as the curing agent, and the reactivity is increased. Is to adjust, 3 at a time
The material is pressurized and filled from 00 kg to 1000 kg, so that a continuous operation can be performed with a pressure pump. Generally, thermosetting resin containing epoxy resin generates heat and accumulates heat when a large amount of resin is mixed at a time. Therefore, depending on the situation, the temperature may exceed 200 ° C, which may damage components such as stator coils. There is. That is, the faster the reaction at room temperature, the greater the heat generation. For example, in the case of a compound that gels in 2 hours or less, the heat generation temperature often exceeds 200 ° C., and such a temperature is not desirable for coil insulation, and it is not desirable. When filling with a pressure pump, the epoxy compound solidifies in the pump, causing malfunction of the pump. In addition, if gelling does not occur at room temperature for more than 8 hours, fill the epoxy compound sequentially while rotating the coil end. This is not preferable because the work is stagnated and the efficiency is reduced.

The epoxy compound 7 of the first embodiment
Is hardened at room temperature, so that heat treatment for hardening is not required, and since the heat generation temperature during hardening is low, volume expansion is small when the epoxy compound 7 is hardened, resulting in little distortion during hardening. So coil 1
a, 1b The insulating ring 2 and the retainer 3 are integrated with the epoxy compound, so that no abnormality occurs in the stator coil even in the heat cycle due to the operation and stop of the generator. As the epoxy resin used here, a general epoxy resin which is liquid at room temperature, such as a bisphenol A epoxy resin, a bisphenol F epoxy resin, and a novolak epoxy resin, is preferably used. Epoxy compound viscosity is 5
In the case of less than 000 mpa · s, the amount of the short fiber base material and the amount of the inorganic filler is reduced, and the heat generation temperature during curing tends to increase, and the volume expansion rate during curing increases,
Internal distortion is likely to occur during curing, and abnormalities such as cracks are likely to occur in the compound layer during long-term operation of the generator. In addition, the viscosity of the epoxy compound is 1,000,
In the case of 000 mpa · s or more, it takes a long time to fill the epoxy compound from the pressure pump, and the workability is deteriorated, bubbles easily enter the epoxy compound layer, and disadvantages such as mechanical brittleness occur, which is not preferable. .

Although the stator coils 1a and 1b, the insulating ring 2, the retainer 3 and the like are firmly integrated due to the excellent adhesiveness of the epoxy compound, since the linear expansion coefficients of the materials are slightly different, the operating conditions In some cases, stress is expected to be applied to the stator coils 1a and 1b. Therefore, on the surface of the stator coil 1, a glass cloth base material or a polyester cloth base material is provided on one surface such as a glass cloth base material or a polyester cloth base material. Using an adhesive tape coated with resin, polyester resin, acrylic resin, or various heat-resistant rubbers, wrapped so that the adhesive layer is in close contact with the corona prevention layer,
The epoxy compound 7 and the tape base are arranged so as to adhere to each other. In this way, the stress applied to the stator coil 1 is absorbed by the adhesive component or the rubber component of the adhesive layer, so that the load on the stator coil 1 is reduced, and the quality is stabilized for a long period of time. . This effect is substantially the same for the spacer 8 impregnated with the epoxy resin inserted between the stator coils 1 shown in FIGS. 3 and 4, and the bubbles generated in the spacer 8 reduce the stress applied to the stator coil 1. Thus, the stator coil 1 is stabilized for a long time.

Next, details of the epoxy compound 7 of the first embodiment and an example of a trial production of a full-size rotary electric machine using the epoxy compound 7 are shown in FIGS. A plurality of insulated wires were combined to form a conductor bundle, and after insulation, epoxy resin was vacuum impregnated to produce a stator coil 1. After a paint for corona prevention is applied to the surface of the stator coil 1, a glass base adhesive tape (Scotch # 27 manufactured by Sumitomo 3M) is wrapped so that the adhesive component comes into contact with the paint for corona prevention. 1c was obtained. Next, after the lower coil 1a is arranged on the stator including the insulating ring 2, the insulating ring support 6, and the stator core 5, as shown in FIGS. 3 and 4, a polyester mat impregnated with an epoxy resin which cures at room temperature. A spacer 8 made of (Nippon Felt Co., Ltd. HP-55) was formed into a size corresponding to the interval between the coils, and was inserted between the coils. Next, the upper opening coil 1b was arranged, and the spacer 8 was inserted in the same manner. After that, the holding member 3 made of a polyester laminated board was arranged, and as shown in FIG. 2, the sealing layer 4 was formed of a material obtained by impregnating a polyester mat with an epoxy resin that cures at room temperature at the position of the end 4. Next, the epoxy compound is pressure-filled. Before that, the structure of the epoxy compound according to the first embodiment is shown in Table 1.

[0018]

[Table 1]

The materials shown in Table 1 above were mixed and kneaded to prepare an epoxy compound 7, and the casting pump 10 was operated and filled under pressure in the manner shown in FIG. At this time, the viscosity of the epoxy compound is 180,000 mpa.
The gelling time was 4.5 hours, and the maximum exothermic temperature of the epoxy compound was about 85 ° C. In the hardeners shown in Table 1, Epomate RD-1 is an alkyd imidazoline type hardener having a slightly lower reactivity with the epoxy resin. Also, Epicure T0184 is an aminopropylene oxide, which has a high reactivity with epoxy resins and cannot be used alone for the purpose of the present invention. However, it can be appropriately mixed with Epomate RD-1 and appropriately mixed to change the mixing ratio. It has the feature that curing conditions can be selected,
This is one of the features of the present invention.

Embodiment 2 Next, Embodiment 2 of the present invention
The epoxy compounds are shown in Table 2 and will be described.

[0021]

[Table 2]

Each of the materials shown in Table 2 was blended and kneaded to prepare an epoxy compound 7, and a full-scale rotary electric machine similar to that shown in the first embodiment was prototyped. At this time, the epoxy compound 7 had the composition shown in Table 2 and the viscosity was 480,000 mpa · s, the gel time was 6 hours, and the maximum heat generation temperature of the epoxy compound 7 was about 53 ° C. Then, after standing at room temperature for 24 hours, a cured stator coil was obtained.

The model generators manufactured in the first and second embodiments were subjected to an operation test for about one month under the same conditions as the actual generator. During operation, the stator coil was strong and electromagnetic vibration was detected. Not good results were obtained.

In the epoxy compounds of the first and second embodiments, a modified aliphatic polyamine is used as a curing agent in an epoxy resin as a typical example.
It gels and cures in time, and the heat generated during curing does not affect the heat resistance of the stator coil. For example, it is as low as 130 ° C. or less, which is the allowable range of class B insulation, and the cured product has excellent heat resistance. Curing agents such as epomate B-002,
A curing agent based on a heterocyclic amine such as N-001, an aliphatic amine, an aromatic diamine, an alicyclic diamine, and the like can all be suitably used. In addition to short fibers, besides glass fiber, polyester, nylon, and a fiber obtained by cutting a commonly used fiber base material such as aramid can also be suitably used.In an epoxy compound, heating and cooling of epoxy resin can be performed even under repeated heating and cooling conditions. The effect of absorbing stress can be exhibited. Further, as the inorganic filler material, generally known boron nitride, zirconium oxide, red iron oxide, titanium oxide and the like can be suitably used.

Also, instead of the spacers 8 shown in FIGS. 3 and 4, a similar effect can be obtained by using a spacer in which a polyester laminate is disposed at the center and the periphery thereof is wrapped with a polyester mat.

In the first and second embodiments, the epoxy compound 7 is directly applied to the insulating ring 2 and the holding member 3.
Has been described, but a method in which the insulating ring 2 and the retainer 3 are joined by bolts arranged in an insulating tube can also be suitably applied. Further, the insulating ring 2 and the retainer 3 can be divided and assembled so that they can be arranged as a tool for pressurizing and filling the epoxy compound 7, and the epoxy compound 7 is removed after being pressurized and filled. You may.

[0027]

Since the present invention is configured as described above, it has the following effects.

The epoxy resin is formed of a composition in which a modified aliphatic polyamine is used as a curing agent, short fibers and an inorganic filler are mixed, and has a viscosity of 50,000 to 1,000,000.
The pot life is 2 to 8 hours at 0 mpa · s, the exothermic temperature at the time of gelation and curing is 130 ° C. or less, and the end of the stator coil is pressure-filled. It is possible to save labor, reduce time, and obtain an integrated stator coil end portion with a strong structure, so that a stator coil of a rotating electric machine of stable quality can be provided even in a heat cycle by starting and stopping.

Further, an insulating ring is provided on the outer peripheral side of the end portion of the stator coil, and a holding member is provided on the inner peripheral side. The epoxy resin and the modified aliphatic polyamine are used as a curing agent, and short fibers and an inorganic filler are mixed. A method of pressure-filling a compound formed from a product, curing and integrating the compound, wherein the viscosity of the compound is 50,000 to 1,000,000.
0 mpa · s, the pot life is 2 to 8 hours, and the exothermic temperature at the time of gelling and curing is 130 ° C. or less, so that workability can be improved, and labor and cost can be reduced.
And a stator coil of a rotating electric machine of stable quality can be obtained.

Further, on the coil surface at the end of the stator coil,
Since the tape treated with the heat-resistant adhesive is provided, the stress of the stator coil is reduced.

Further, since the spacer is provided between the stator coils, the stress is similarly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a method of manufacturing an end portion of a stator coil according to Embodiments 1 and 2 of the present invention.

FIG. 2 is a plan view showing Embodiments 1 and 2 of the present invention, as viewed from an inner diameter side in FIG. 1;

FIG. 3 is a sectional view taken along line xx of FIGS. 1 and 2, showing the first and second embodiments of the present invention.

FIG. 4 is a schematic diagram showing an arrangement of spacers according to Embodiments 1 and 2 of the present invention.

FIG. 5 is a view showing a conventional stator coil end support device of a rotating electric machine.

FIG. 6 is an enlarged sectional view of a stator coil end of a conventional rotating electric machine.

[Description of Signs] 1 Stator coil, 1a lower coil, 1b upper coil, 1c coil with adhesive tape, 2 insulating ring, 3
Holder, 4 seal layer, 6 insulating ring support, 7, 7
a, 7b epoxy compound, 8 spacer, 10
Casting pump.

Continued on the front page F-term (reference) 5H604 AA01 AA05 BB04 BB10 BB14 CC01 CC05 CC14 DA14 DA15 DA16 DA19 DB02 DB18 DB24 DB25 PB02 PB03 QA01 QA03 QA04 QA08 5H615 AA01 BB02 BB07 BB14 PP01 PP14 QQ03 QQ07 QSRR TT31 TT34 TT36 TT39

Claims (11)

[Claims] In a stator coil of a rotating electric machine, an end of the stator coil is filled with an epoxy compound under pressure, and the epoxy compound is formed by using a modified aliphatic polyamine as a curing agent in an epoxy resin. It is formed of a composition in which fibers and an inorganic filler are mixed, and has a viscosity at room temperature of 50,000 to 1,000,000 mpa.
s, wherein the pot life is 2 to 8 hours, and the heat generation temperature during gelation and hardening is 130 ° C. or lower. 2. A stator coil of a rotating electric machine, wherein an insulating ring is provided on an outer peripheral side of an end of the stator coil, and a holding member is provided on an inner peripheral side of the stator coil. A method for manufacturing a stator for a rotating electric machine, characterized in that an epoxy compound formed of a composition obtained by mixing an aliphatic polyamine as a curing agent and a short fiber and an inorganic filler is filled under pressure to be cured and integrated. 3. An epoxy compound having a viscosity at room temperature of 50,000 to 1,000,000 map · s, a pot life of 2 to 8 hours, and an exothermic temperature of 130 ° C. or less during gelation and curing. The method for manufacturing a stator coil of a rotating electric machine according to claim 2, characterized in that: 4. The modified aliphatic polyamine as a curing agent is a combination of Epomate RD-1 (manufactured by Yuka Shell) and Epicur TO184 (manufactured by Yuka Shell). A stator coil for a rotating electric machine according to claim 1. 5. The modified aliphatic polyamine as a curing agent is a combination of Epomate RD-1 (manufactured by Yuka Shell) and Epicur TO184 (manufactured by Yuka Shell). A method for manufacturing a stator coil for a rotating electric machine according to claim 3. 6. The stator coil of a rotating electric machine according to claim 1, wherein the modified aliphatic polyamine as a curing agent is Epomate RD-1 (manufactured by Yuka Shell Co., Ltd.). 7. The stator coil for a rotating electric machine according to claim 2, wherein the modified aliphatic polyamine as a curing agent is Epomate RD-1 (manufactured by Yuka Shell Co., Ltd.). Method. 8. The stator coil of a rotating electric machine according to claim 1, wherein a tape treated with a heat-resistant adhesive is provided on a coil surface at an end of the stator coil. 9. The stator coil according to claim 1, wherein a spacer is provided between adjacent coils at the ends of the stator coil. 10. The stator coil according to claim 9, wherein the spacer is a polyester mat impregnated with an epoxy resin. 11. The stator coil according to claim 9, wherein the spacer is formed by wrapping a polyester laminate with a polyester mat and impregnating with an epoxy resin.