JPH11215753A - Insulating coil and insulating tape used with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of insulating characteristic by winding a tape bonded by hardening a catalyst and binder resin, consisting of phenol resin, and impregnation-hardening thermosetting impregnating resin consisting of epoxy resin and acid anhydride. SOLUTION: An insulating tape is produced by bonding an insulating material to reinforcing material with binder resin consisting of phenol resin containing a hardening catalyst. The insulating tape is wound around a coil conductor 3 and is impregnated with thermosetting resin consisting of epoxy resin and acid anhydride, and then hardened to form an insulating layer 4 and obtain an insulating coil 2. The binder resin of the insulating tape consists of the hardening catalyst and phenol resin, so that the epoxy resin in the impregnation resin reacts with the phenol resin. The impregnating resin and the binder resin are integrated to be hardened, such that it is possible to provide an insulating coil with improved insulating layer characteristic and high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating coil for a rotating machine for a generator, a rotating machine for general industrial use or a rotating machine for a vehicle, an insulating coil for a rotating electrical machine manufactured by a full impregnation method, and an insulating tape used therefor. It is about.

[0002]

2. Description of the Related Art A rotating machine for a generator, a rotating machine for general industry, or a rotating machine for a vehicle is required to have a higher voltage and a smaller size, and an insulating coil incorporated in the rotating machine has withstand voltage and heat resistance. What is required is excellent.

[0003] The insulating coil incorporated in the rotating machine is generally placed in a gaseous phase. At a high voltage, corona discharge occurs due to air destruction of gas existing in the coil portion, and the insulating layer of the coil may be broken. Therefore, an insulating tape using a mica foil having excellent heat resistance, corona resistance, voltage resistance, and the like is used as an insulating material. The mica foil is made by thinning the mica raw ore into thin flakes obtained by baking the mica foil and the mica raw ore or mica foil residue by a firing method, a water jet method, etc. Mica foil formed in a sheet shape. The insulating tape is obtained by using a reinforcing material such as a glass cloth, a film, or a nonwoven fabric as a backing material, and bonding the mica foil to the backing material with a binder resin.

[0004] In a normal insulating coil, the above-mentioned insulating tape is wound on a coil conductor having a predetermined shape formed by combining wires having an appropriate insulation coating, and this is vacuum-dried in an impregnation tank to form an insulating coil. After removing the volatile components and air from the layer, inject an impregnated resin consisting of a thermosetting resin, further pressurize and infiltrate the wound layer, take it out and cure it to form an insulating layer It was manufactured by.

[0005] In forming an insulating tape, as a binder resin for bonding a reinforcing material and an insulating material made of mica foil, (1) a binder resin having flexibility from the viewpoint of workability and having a low surface tackiness; ) A thermosetting resin impregnating resin having good permeability, (3) a resin having excellent heat resistance and insulating properties were used, and an epoxy resin or an allyl group-containing polymer was used as a catalyst together with an organic acid metal salt. .

As the impregnating resin, a thermosetting resin such as unsaturated polyester, epoxy resin or silicone resin having a low viscosity is used. In particular, the viscosity is low, the impregnation workability is good, and the properties of the cured product are excellent. A resin system which cures an epoxy resin with an acid anhydride is generally used.

However, epoxy resin-anhydride curing impregnated resins generally use a curing catalyst because of a long pot life but a slow curing rate. However, the curing catalyst is directly applied to the impregnated resin. When added, there is a problem that the viscosity of the resin increases quickly and the pot life is shortened. In particular, resin impregnation of the insulation layer of the insulation coil should be performed by immersing the insulation coil in an impregnation tank filled with the impregnation resin, and when impregnation is complete, add a new insulation coil and use the impregnation resin repeatedly. Therefore, it is desired that the pot life be long without increasing the viscosity during the impregnation or storage of the impregnated resin.

In the method in which the curing catalyst is directly added to the impregnated resin as described above, the pot life of the impregnated resin is shortened. Therefore, the curing catalyst referred to as a catalyst separation system is added in advance to the insulating layer side instead of the impregnated resin. There is a known method. That is,
This is a method in which a curing catalyst is added to the binder resin of the insulating tape.

[0009] On the other hand, the insulation treatment method of the insulating coil includes a resin impregnation of a single coil, heating and curing by a heat press, and then incorporating the coil into a stator core slot for connection and fixing a coil before resin impregnation. There is an all-impregnation method in which after assembling and connecting to a core core slot, this is impregnated collectively. Conventionally, small insulated coils are all impregnated,
The large impregnated coil had a simple impregnation method in which the coil was treated as a single coil.However, since the full impregnation method has the following advantages, the application of the full impregnation method to large insulated coils is desired. . (1) Since only one impregnation and curing step is required, the processing cost can be reduced. (2) Since the coil and the stator core are firmly fixed by the impregnating resin, the mechanical rigidity of the entire winding is improved. (3) Since the impregnating resin is filled between the coil and the stator core slot, the thermal resistance during this period is smaller than that of the simple impregnation method. The temperature rise can be suppressed more efficiently than the simple impregnation method.

[0010]

However, in the above-mentioned catalyst separation method, a curing catalyst capable of rapidly curing a thermosetting impregnated resin composed of an epoxy resin and an acid anhydride is an epoxy resin or an allyl which is a binder resin of an insulating tape. Since it also acts as a curing catalyst to cure the group-containing polymer alone, the reaction of the binder resin itself progresses due to the heat history and long-term storage during the production of the insulating tape, and as a result, the insulating tape becomes harder, and the insulating tape of the insulating coil becomes However, not only the winding workability is deteriorated, but also the impregnating property of the impregnated resin is lowered, so that sufficient characteristics cannot be obtained, and there has been a problem that the reliability as an insulating coil is greatly reduced. Therefore, there is a restriction that the above-described conventional insulating tape must be stored at a low temperature, or must be used immediately after manufacturing the insulating tape.

In the case of using an epoxy resin or an allyl group-containing polymer, which has been conventionally used as a binder resin for an insulating tape, after the resin is impregnated, the binder resin melts and diffuses into the impregnated resin during curing to form a uniform state. Before the binder resin alone, a curing reaction is caused by the binder resin alone, so that the insulating layer becomes a non-uniform cured resin product, heat resistance is lowered, and insulation properties are deteriorated due to long-term high-temperature thermal degradation. For this reason, the long-term high-temperature thermal degradation lowers the insulation properties, and thus limits the maximum operating temperature.

Further, the organic acid metal salt used as a curing catalyst in the conventional catalyst separation system has a somewhat improved storage stability of the insulating tape, but has a low catalytic activity and a low curing speed. Due to the large heat capacity, the rate of temperature rise of the insulating coil during curing is slow, and the impregnated resin leaks during curing, resulting in a problem that reliability of the insulating coil is greatly reduced. For this reason, there is a limitation on the application target even in the production by the full impregnation method.

The present invention has been made to solve such a problem, and has as its object to obtain a highly reliable insulated coil. It is another object of the present invention to obtain a highly reliable insulated coil that can be manufactured by the full impregnation method. Another object of the present invention is to obtain an insulating tape which is easy to handle.

[0014]

According to a first aspect of the present invention, there is provided a first insulated coil comprising a coil conductor, and an insulating tape formed by bonding an insulating material to a reinforcing material with a binder resin by winding the conductor into a thermosetting impregnation. In an insulating coil provided with an insulating layer cured by impregnation with a resin, the binder resin is a phenol resin containing a curing catalyst, and the thermosetting impregnated resin is an epoxy resin and an acid anhydride.

In a second insulating coil according to the present invention, an insulating layer formed by winding an insulating tape formed by bonding an insulating material to a reinforcing material with a binder resin is provided on a coil conductor, and is housed in a stator core slot. A thermosetting impregnating resin is impregnated and cured together with the stator core, and in an insulating coil integrated with the stator core by a cured product of the resin, the binder resin is a phenol resin containing a curing catalyst, The thermosetting impregnated resin is an epoxy resin and an acid anhydride.

A third insulating coil according to the present invention is the above-mentioned first or second insulating coil, wherein the phenolic resin has two or more phenolic hydroxyl groups.

The fourth insulating coil according to the present invention, in any one of the first to third insulating coils, wherein the curing catalyst is an imidazole compound, an imidazole compound and an organic acid metal salt, or a quaternary ammonium salt. Things.

The first insulating tape according to the present invention is a phenol resin containing a curing catalyst, wherein an insulating material is bonded to a reinforcing material.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The insulated coil according to the present invention has an insulating layer provided around a coil conductor. The insulating layer is formed by winding an insulating tape on a thermosetting curable resin made of an epoxy resin and an acid anhydride. The insulating tape is impregnated with an impregnating resin and cured. In particular, the insulating tape is obtained by bonding an insulating material to a reinforcing material with a binder resin made of a phenol resin containing a curing catalyst. The insulating tape can be used in any shape such as a sheet shape or a tape shape, but unless otherwise specified, these are collectively referred to as an insulating tape in the present invention.

As the insulating material, mica foil composed of flakes obtained by stripping mica raw ore, and the remaining mica raw ore or mica foil, etc., are treated by a firing method, a water jet method or the like to produce fine scales. Then, a laminated mica foil formed into a sheet by making the paper is used.

The reinforcing material is not particularly limited as long as it can reinforce the mica foil. For example, an insulating backing material such as a glass cloth, a polyester film, a polyimide film, or a polyester nonwoven fabric is used.

In the insulating coil of the present invention, since the binder resin of the insulating tape is composed of a curing catalyst and a phenol resin, the epoxy resin in the impregnated resin also reacts with the phenol resin, and the impregnated resin and the binder resin are integrally cured. Therefore, the characteristics of the insulating layer are improved, and a highly reliable insulating coil can be obtained.

As the phenolic resin according to the present invention, those containing two or more phenolic hydroxyl groups are preferable because the crosslinking density of the cured resin in the insulating layer is increased and the heat resistance is improved, but there is no particular limitation. Such compounds include phenol novolak, cresol novolak, xylesol novolak, bisphenol A novolak, bisphenol F novolak, bisphenol A
Novolak of D, bisphenol A, bisphenol F, bisphenol AD, diallyl bisphenol A,
There are diallyl bisphenol F and diallyl bisphenol AD, etc., alone or in a mixture thereof.

From the viewpoints of workability and compatibility with the impregnating resin, it is desirable to use a mixture of a solid phenolic resin and a liquid phenolic resin. The phenol resin is desirably 50 to 90% by weight. That is, the insulating tape is hardened only with the solid phenol resin, and the insulating tape is sticky and the winding workability is deteriorated only with the liquid phenol resin. In addition, after the resin is impregnated in the insulating coil, the binder resin is preferably a phenol resin having a softening temperature lower than the curing temperature at which the binder resin changes from a liquid state to a liquid state so that the binder resin melts and diffuses into the completely impregnated resin during the curing. .

The curing catalyst according to the present invention is not particularly limited as long as it has a function of accelerating the reaction between the epoxy resin and one or both of the acid anhydride and the phenol resin. Such compounds include tertiary amine compounds such as tris (dimethylaminomethyl) phenol, dimethylbenzylamine or 1,8-diazabicyclo (5,4,0) undecene-7, 2-methylimidazole, Ethyl-4-methylimidazole, 2-phenylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-ethylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-ethyl-4-methyl Imidazole, 1-methyl-
2-ethylimidazole or 1-isobutyl-2-
Imidazole compounds such as methylimidazole, tetramethylammonium chloride, tetraethylammonium bromide, tetraethylammonium chloride, tetraethylammonium iodide, tetrapropylammonium bromide, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium iodide, trioctyl Methyl ammonium chloride, triuralyl methyl ammonium chloride, benzyl triethyl ammonium chloride, benzyl triethyl ammonium bromide, benzyl triethyl ammonium iodide, benzyl tributyl ammonium chloride, benzyl tributyl ammonium bromide, benzyl tributyl ammonium Quaternary ammonium salts such as iodide or phenyltrimethylammonium chloride, organic acid metal salts such as zinc octylate, zinc naphthenate, cobalt acetylacetate, zinc gabulinate or manganese acetylacetonate, tetraethylammonium tetraphenylborate, 2-ethyl ―4
-Borate salts such as methylimidazolium tetraphenylborate, methyltributylphosphonium tetraphenylborate or tetraphenylphosphonium tetraphenylborate, phosphorus compounds such as triphenylphosphine, and 3 such as boron trifluoride monoethylamine. Boron fluoride amine complex and the like. Among these, imidazole compounds are preferable from the viewpoint of catalytic activity, and mixed or quaternary ammonium salts of imidazole compounds and organic acid metal salts are preferable from the viewpoint of catalytic activity and insulating properties.

The thermosetting resin for impregnation according to the present invention is not particularly limited as long as it comprises an epoxy resin and an acid anhydride.
Further, a maleimide resin having a heterocyclic ring in the molecular structure may be added to the epoxy resin-anhydride to improve heat resistance.

The insulating tape according to the present invention is produced by dissolving a binder resin obtained by adding a curing catalyst to a phenolic resin in a solvent, applying this to an insulating material and a reinforcing material, and evaporating the solvent. The binder resin content is 3 ~
If it is less than 3% by weight, the insulating material such as mica foil and the reinforcing material will not be sufficiently integrated, and
If it exceeds 5% by weight, the impregnation with the impregnated resin becomes insufficient, and the properties after curing deteriorate.

The insulating coil of the present invention is obtained by winding the above-mentioned insulating tape on a coil conductor having a predetermined shape formed by combining the wires coated with an insulating coating, and drying this in a vacuum in an impregnation tank. After removing the volatile components and air, an impregnating resin made of a thermosetting resin is injected, further pressurized and penetrated into the wound layer, taken out and cured to form an insulating layer, thereby obtaining an insulating layer. Can be.

As described above, the insulation treatment method of the insulating coil is such that the coil is impregnated with a resin alone, heat-cured by a heat press, then incorporated into a stator core slot and connected, and a coil before resin impregnation is used. There is the following total impregnation method in which a stator core slot is assembled and connected, and then impregnated collectively.

In the total impregnation method, an insulating layer in which the above-mentioned insulating tape is wound around a coil conductor is provided, stored in a stator core slot, impregnated with the thermosetting impregnating resin together with the stator core, and cured. This is a method of integrating the stator iron core with a cured resin.

When a highly active catalyst such as an imidazole compound is added to the binder resin, the insulating coil impregnated by the above-mentioned total impregnation method can be cured without resin leakage at the time of curing, and a highly reliable insulating coil can be obtained. Can be

Further, since the phenol resin does not react with the curing catalyst of the epoxy resin, there is no change in the heat history and the long-term storage during the production of the insulating tape, and an insulating tape excellent in stability and handling can be obtained.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. The present invention is not limited to these examples. In addition, the binder resin used in the Examples and Comparative Examples, a curing catalyst,
Abbreviations of the impregnated resin and the acid anhydride are as follows. Phenol resin XLC-4L: xylesol novolak (hydroxyl equivalent 1
68) {Trade name: XLC-4L, manufactured by Mitsui Toatsu Co., Ltd.} PSM-4261: Phenol novolak (hydroxyl equivalent: 103) {Trade name: PSM-4261, manufactured by Gunei Chemical Industry Co., Ltd.} YLH129: Bisphenol A Novolak (hydroxyl equivalent: 120) {trade name: YLH129, manufactured by Yuka Shell Epoxy Co., Ltd.} DABPA: diallyl bisphenol A {trade name: DA
BPA, manufactured by Mitsui Toatsu Co., Ltd. DABPF: diallyl bisphenol F Product name: DA
BPF, manufactured by Honshu Chemical Co., Ltd.｝ Imidazole compounds 2E4MZ: 2-ethyl-4-methylimidazole ｛brand name: 2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd.｝ 1B2MZ: 1-benzyl-2-methylimidazole ｛brand name : 1B2MZ, manufactured by Shikoku Chemicals Co., Ltd. Quaternary ammonium salt TEA-Cl: tetraethylammonium chloride {manufactured by Wako Pure Chemical Industries, Ltd.} BTEA-Cl: benzyltriethylammonium chloride {manufactured by Wako Pure Chemical Industries, Ltd.} BTEA-Br: benzyltriethylammonium bromide (manufactured by Wako Pure Chemical Industries, Ltd.) BTEA-I: benzyltriethylammonium iodide (manufactured by Wako Pure Chemical Industries, Ltd.) Organic metal salt Co (II) AA: cobalt ( II) Acetylacetonate (manufactured by Wako Pure Chemical Industries, Ltd.) -30: Tris (dimethylaminomethyl) phenol {trade name: DMP-30, manufactured by Rohm and Haas Co., Ltd.} DBU: 1,8-diazabicyclo (5,4,0) undecene-7 << Epoxy resin E825: bisphenol A type epoxy resin (epoxy equivalent: 178) >> Product name: E825, manufactured by Yuka Shell Epoxy Co., Ltd. >> EX201: resorcinol type epoxy resin (epoxy equivalent: 118) ｛Trade name: EX201, manufactured by Nagase Industries Co., Ltd.｝ E834: Bisphenol A type epoxy resin (epoxy equivalent 250) ｛Trade name: E834, manufactured by Yuka Shell Epoxy Co.｝ E1001: Bisphenol A type epoxy resin (epoxy equivalent 475) ｛Product name: E1001, manufactured by Yuka Shell Epoxy Co., Ltd.｝ E1032: G Phenylmethane-type polyfunctional epoxy resin (epoxy equivalent: 173) ｛Product name: E1032, manufactured by Yuka Shell Epoxy Co.｝ Acid anhydride QH-200: methyl-tetrahydrophthalic anhydride (acid anhydride equivalent: 166) ｛Product name: QH-200, manufactured by Zeon Corporation. Resin other than epoxy resin PKHH: phenoxy resin {trade name: PKHH, manufactured by Union Carbide Co., Ltd.} Dap: diallyl isophthalate polymer {trade name: Dap, Osaka Soda Co., Ltd. Production

Embodiment 1 (1) Preparation of Binder Solution for Insulating Tape As a binder resin solution for producing an insulating tape according to the present invention, a solid phenol resin (trade name: XLC-
4L) is a composition consisting of 70 parts by weight (hereinafter referred to as “parts”), 30 parts of a liquid phenol resin (trade name: DABPA), and 7 parts of a curing catalyst (trade name: DMP-30). It was dissolved in an organic solvent mixture of toluene at a ratio of 1: 1 to prepare a non-volatile content of about 25% by weight.

(2) Preparation of Insulating Tape Using the binder resin solution for insulating tape obtained in the above (1), the thickness of laminated mica sheet (trade name: DR-2, manufactured by Okabe Mica Industry Co., Ltd.) 0.07mm, width 1000m
m and a glass cloth having a thickness of 0.03 mm are bonded together, and the mixed organic solvent of the binder resin solution is heated and dried at 140 ° C. for 5 minutes, and the binder resin content is 6 to 10% by weight.
Was produced.

(3) Preparation of thermosetting resin 41.5 parts of epoxy resin (trade name: E825), 10.4 parts of epoxy resin (trade name: EX-201), acid anhydride curing agent (trade name: QH) -200) 48.1 parts to obtain a thermosetting resin for impregnation.

(4) Preparation of Composite Insulating Tissue Plate A composite insulating tissue plate was prepared by adding a Teflon tape set with a 3.0 mm spacer to a glass plate and subjecting it to a mold release treatment.
Cut the mx 10 cm cut insulating tape of (2) above into 27
The thermosetting resin of the above (3) is vacuum-impregnated, and the temperature is raised from room temperature to 155 ° C. at a rate of 0.36 ° C./min, kept at 155 ° C. for 16 hours. The curable resin was cured to obtain a composite insulating tissue board for evaluation.

(5) Heat Resistance Test of Composite Insulated Tissue Plate 10 cm × 1 having a plate thickness of 3.0 mm prepared in (4) above.
The 0 cm composite insulating tissue plate was thermally degraded in an oven at 200 ° C., and swelling and peeling of the composite insulating tissue plate due to the thermal deterioration were visually observed.

(6) Dielectric tangent (tan) of the composite insulating tissue plate
δ) Measurement The temperature dependence of the dielectric loss tangent (tan δ) measurement is as described in (4) above.
A composite insulating tissue board of 10 cm × 10 cm with a board thickness of 3.0 mm produced in JIS K6911 was used as an evaluation sample.
The measurement was carried out according to.

(7) Gelation time The gelation time was 0.000027 mol / h of the curing catalyst (trade name: DMP-30) to the thermosetting resin of the above (3).
g was added and measured at 150 ° C. using a gel time tester (manufactured by Yasuda Seiki Co., Ltd.).

(8) Production of Insulated Coil by Total Impregnation Method FIG. 1 is an explanatory view for explaining an insulated coil according to an embodiment of the present invention. Show. In the figure, 1 is a stator core laminated with silicon steel plates, 2 is an insulating coil of the embodiment of the present invention, 3 is a conductor, 4 is an insulating layer, 5 is a wedge, 6 is an intermediate filler, 7
Is a stator core slot, and 9 is a protective insulating layer. The insulating coil 2 is formed by winding the insulating tape obtained in the above (2) a predetermined number of times around the conductor 3 to form an insulating layer 4 of the coil. A glass tape is wound around the surface of the insulating layer 4 for protection insulation. Layer 9. This is inserted into the core slot 7 and the wedge 5
And the coil 2 was fixed. After a while, the above (3)
Impregnation of the thermosetting resin prepared in step 1 and from room temperature to 0.
The temperature was raised to 155 ° C under the temperature increasing condition of 36 ° C,
After holding for 6 hours, the thermosetting resin was cured to obtain an insulating coil.

(9) Production of Insulated Coil by Single Impregnation Method An insulating tape is wound around the coil conductor a predetermined number of times to form a ground insulating layer, and a glass tape is further wound as a protective insulating layer. The thermosetting resin prepared in 3) is impregnated, inserted into a mold, maintained at a mold temperature of 155 ° C. and a pressure of 20 kg / cm ² for 16 hours, and heated and pressed to cure the thermosetting resin and to insulate the resin. A coil was obtained.

(10) Measurement of Insulation Characteristics of Insulated Coil The insulation characteristics of the insulated coil were determined by the dielectric loss tangent-voltage characteristics (Δtan
δ) (dielectric tangent difference between 12 kV and 2 kV) and breakdown voltage (BDV) (measured in oil at a constant temperature rise of 1 kV / sec). The results are shown in Table 1.

[0044]

[Table 1]

Embodiments 2-4. XLC-4L, DABPA used in Example 1 as a phenol resin for the binder resin
Instead of PSM-4261, YLH129, DABP
In the same manner as in Example 1 except that F was used, an insulating tape,
A composite insulating tissue board and an insulating coil were prepared and evaluated.
The results are shown in Table 1.

Embodiments 5 to 7 Instead of DMP-30 used in Example 1 as a curing catalyst, DBU, 2E4M
Z, except that 1B2MZ was used.
An insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated. The results are shown in Table 1.

Embodiments 8 and 9 DMP-3 as curing catalyst
1B2MZ-zinc octylate mixed catalyst instead of 0, 1
In the same manner as in Example 1 except that the B2MZ-zinc naphthenate mixed catalyst was used, an insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated. Table 2 shows the results.

[0048]

[Table 2]

Embodiments 10 to 13 DMP as curing catalyst
TEA-Cl, BTEA-Cl, B instead of -30
Except for using TEA-Br and BTEA-I, an insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated in the same manner as in Example 1. Table 2 shows the results.

Comparative Example 1 XLC-4L of binder resin,
Instead of DABPA, E834 and E1001 are DMP-
Example 1 except that zinc octylate was used instead of 30
In the same manner as described above, an insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated. Table 3 shows the results.

[0051]

[Table 3]

As is apparent from Table 3, since zinc octylate has a low catalytic activity and a long gel time, resin leakage of the impregnated thermosetting resin occurs during curing in the production of an insulated coil by the full impregnation method. However, sufficient insulation properties cannot be obtained. In addition, even in an insulating coil manufactured by impregnation with a simple substance having sufficient insulating properties at the initial stage, a decrease in insulating properties due to thermal deterioration is observed. Also, in the heat resistance test of the composite insulating tissue plate, interface peeling occurs at 200 ° C. for one day, swelling occurs, and the heat resistance is low.

Comparative Example 2 XLC-4L of binder resin,
An insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated in the same manner as in Example 1, except that E1032 was used instead of DABPA and Co (II) AA was used instead of DMP-30. Table 3 shows the results. Table 3
As is clear from the graph, Co (II) AA has a low catalytic activity and a long gel time, so that in the production of an insulating coil by the full impregnation method, resin leakage of the impregnated thermosetting resin occurs during curing,
Sufficient insulation properties cannot be obtained even at the initial stage. In addition, even in an insulating coil manufactured by impregnation with a simple substance having sufficient insulating properties at the initial stage, a decrease in insulating properties due to thermal deterioration is observed. In addition, in the heat resistance test of the composite insulating tissue board, 2
Interfacial peeling occurs at 00 ° C. for one day, causing swelling and low heat resistance.

Comparative Example 3 XLC-4L of binder resin,
Instead of DABPA, E834 and E1001 are DMP-
An insulating tape was produced in the same manner as in Example 1 except that 2E4MZ was used instead of 30. Table 3 shows the results. The thermal history of heating and drying the mixed organic solvent of the binder solution at 140 ° C. for 5 minutes during the production of the insulating tape, the reaction of the epoxy resin of the binder progressed due to the catalytic effect of imidazole, and the insulating tape became harder, No sample and insulated coil could be manufactured.

Comparative Example 4 XLC-4L of binder resin,
Dap instead of DABPA, PKHH, DMP-
An insulating tape, a composite insulating tissue board, and an insulating coil were prepared and evaluated in the same manner as in Example 1 except that 2E4MZ was used instead of 30. Table 3 shows the results.
As is evident from Table 3, the insulation coils manufactured by either the simple impregnation method or the full impregnation method had sufficient insulation properties at the beginning. However, a decrease in insulation properties due to thermal degradation is observed. Also, in the heat resistance test of the composite insulating tissue plate, interface peeling occurs at 200 ° C. for one day, swelling occurs, and the heat resistance is low.

On the other hand, as is clear from Table 1 and Table 2, in any of the above-mentioned examples, a binder made of a conventional epoxy resin or an allyl group-containing polymer was used regardless of which phenol resin was used as the binder resin (Comparative Example 1). ~ 4)
In comparison with the above, the heat resistance is significantly improved in the heat resistance test of the composite insulating tissue board and the insulating properties of the insulating coil after the heat deterioration.

In each of the above Examples, the gel time of any of the curing catalysts was shorter than that of Comparative Example 1 or Comparative Example 2 in which an organic acid metal salt such as zinc octylate was used as the curing catalyst. The curing speed has been greatly improved,
Insulation coils manufactured by the total impregnation method, which were not possible using organic acid metal salts as curing catalysts, have obtained the same reliability as insulation coils manufactured by simple impregnation.

In particular, 2E4 which is an imidazole compound
Using MZ, 1B2MZ as a curing catalyst (Examples 6 to 6)
In the case of 9), in addition to the improvement of the insulation reliability, the gel time is further shortened and the glass transition temperature is also improved. Furthermore, the tan δ characteristics at high temperature of the composite insulating tissue board using a mixed catalyst of an imidazole compound and an organic acid metal salt or a quaternary ammonium salt as a catalyst are significantly improved as compared with a single catalyst system of an imidazole compound such as 1B2MZ. Have been.

[0059]

According to the first insulated coil of the present invention, a coil conductor and an insulating tape formed by bonding an insulating material to a reinforcing material with a binder resin are wound around the conductor and impregnated with a thermosetting impregnating resin. In the insulating coil provided with the cured insulating layer, the binder resin is a phenol resin containing a curing catalyst, and the thermosetting impregnated resin is an epoxy resin and an acid anhydride. There is.

According to the second insulating coil of the present invention, the coil conductor is provided with an insulating layer formed by winding an insulating tape obtained by bonding an insulating material to a reinforcing material with a binder resin, and is housed in the stator core slot. A thermosetting impregnating resin is impregnated and cured together with the stator core, and in an insulating coil integrated with the stator core by a cured product of the resin, the binder resin is a phenol resin containing a curing catalyst, The thermosetting impregnated resin is an epoxy resin and an acid anhydride, and can be manufactured by the full impregnation method, and has an effect of high reliability.

According to the third insulated coil of the present invention, in the first or second insulated coil, the phenolic resin has two or more phenolic hydroxyl groups and has an effect of high reliability.

According to the fourth insulating coil of the present invention, in any one of the first to third insulating coils, the curing catalyst is an imidazole compound, an imidazole compound and a metal salt of an organic acid, or a quaternary ammonium salt. And has the effect of high reliability.

According to the first insulating tape of the present invention, the insulating material is bonded to the reinforcing material with a phenol resin containing a curing catalyst, and there is an effect that handling is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an insulated coil according to an embodiment of the present invention.

[Explanation of symbols]

 2 Insulation coil, 3 conductors, 4 insulation layers.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirofumi Fujioka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (5)

[Claims] 1. An insulating coil comprising: a coil conductor; and an insulating layer formed by winding an insulating tape formed by bonding an insulating material to a reinforcing material with a binder resin around the conductor, impregnating with a thermosetting impregnating resin, and curing. An insulating coil, wherein the binder resin is a phenol resin containing a curing catalyst, and the thermosetting impregnated resin is an epoxy resin and an acid anhydride. 2. An insulating layer formed by winding an insulating tape formed by bonding an insulating material to a reinforcing material with a binder resin is provided on a coil conductor, housed in a stator core slot, and thermoset impregnated resin together with the stator core. Is cured by impregnating the resin, in an insulating coil integrated with the stator core by a cured product of the resin, the binder resin is a phenolic resin containing a curing catalyst, the thermosetting impregnated resin is an epoxy resin and An insulating coil, which is an acid anhydride. 3. The phenolic resin according to claim 1, wherein the phenolic resin has two or more phenolic hydroxyl groups.
4. The insulated coil according to claim 1. 4. The insulating coil according to claim 1, wherein the curing catalyst is an imidazole compound, an imidazole compound and a metal salt of an organic acid, or a quaternary ammonium salt. 5. A phenol resin containing a curing catalyst,
An insulating tape made by bonding an insulating material to a reinforcing material.