JP2016072301A - Insulation material, isolated coil using the insulation material, manufacturing method thereof and device including the isolated coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation material capable of withstanding a high mechanical stress in addition to an excellent insulation property, arc resistance performance and heat resistance property, and capable of maintaining the excellent insulation property for a long period of time, and provide an isolated coil and devices including the isolated coil.SOLUTION: The insulation material includes: a resin material 3 which contains a resin material of 100 part by weight, which includes an epoxy resin which has two or more epoxy groups per molecule and a curing agent for epoxy resin and a novolak type resin; and particles which include 10 to 40 part by weight of silicon oxide particles 2 with particle of glass fiber diameter 50nm or less, which is held by a base material 1 of a glass fiber.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an insulating material, an insulating coil using the insulating material, a manufacturing method thereof, and an apparatus including the insulating coil.

  Conventionally, a number of electrical insulation materials have been proposed and used as insulation materials for shielding between conductors and between grounds in various electrical devices or machines.

  In general, an insulating coil incorporated in a generator, a rotating electrical machine, or the like includes a conductor for supplying electricity and an insulating material disposed around the conductor.

  For example, as an insulating material for high voltage devices, conventionally, an insulating material composed of a mica layer and a fibrous layer impregnated with a resin material has been proposed. This insulating material is preferable in that the mica layer of the constituent element has particularly excellent discharge resistance characteristics.

JP-A-11-213757 JP 2006-57017 A

  Electrical insulating materials are required not only to have insulating properties, but also to satisfy various required performances depending on their usage.

  Therefore, the problem to be solved by the present invention is that it can cope with mechanical stress such as high centrifugal force and bending stress in addition to excellent insulation, arc resistance, and heat resistance, and such mechanical stress. Insulating material having high durability that can maintain excellent insulation above a certain level for a long period of time even after being repeatedly exposed to a long period of time, an insulating coil using this insulating material, a manufacturing method thereof, and An object of the present invention is to provide a device or the like having this insulating coil.

  In view of the situation as described above, the present inventors have found an insulating material that can satisfy the above requirements.

  Therefore, the insulating material according to the embodiment of the present invention includes a resin material 100 including an epoxy resin having two or more epoxy groups per molecule, a curing agent for epoxy resin, and a novolac resin in a base material made of glass fiber. A particle-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a weight part and a particle size of 50 nm or less is held.

  An embodiment of the present invention relates to a method of manufacturing the insulating material, an insulating coil using the insulating material, a manufacturing method thereof, and a rotating electrical machine including a wound rotor coil formed using the insulating coil. And a variable speed pumped-storage generator.

Sectional drawing which shows the preferable specific example of the insulating material by embodiment. The perspective view which shows one preferable specific example of the insulated coil by embodiment. FIG. 3A is a perspective view showing a structure of a turbine generator to which a preferred specific example of an insulating material according to an embodiment can be applied, in which FIG. 3A shows an indirect hydrogen cooling type turbine generator, and FIG. It is a figure shown about the turbine generator of a direct cooling system. FIG. 4A is a cross-sectional view of a preferred specific example of a high voltage coil to which the insulating material according to the embodiment can be applied, and FIG. 4A is a diagram illustrating a stator coil of an indirect hydrogen cooling turbine generator. These are figures shown about the stator coil of the turbine generator of a direct water cooling system.

  The embodiments described below are exemplary, and therefore the scope of the invention is not limited to these specifically disclosed ranges.

<Insulation material>
The insulating material according to the embodiment of the present invention is characterized in that a predetermined “particle-containing resin material” (detailed below) is held in a “substrate made of glass fiber”.

  Here, “held” means that a predetermined “particle-containing resin material” is impregnated or adhered to the inside and the surface of the “substrate made of glass fiber”. In such an insulating material according to the embodiment of the present invention, a composite is formed in which “a substrate made of glass fiber” and “particles” and “resin material” in a predetermined “particle-containing resin material” are integrated. Therefore, the breakage and drop-off of particles, resin materials, and glass fibers are effectively suppressed, and it is possible to achieve good electrical insulation and excellent mechanical strength as an insulating material. Is.

  Particularly preferred applications in which the usefulness of the insulating material according to the embodiment of the present invention is remarkably recognized include, for example, an insulating coil for high voltage equipment, a rotor coil, particularly a wound rotor coil.

<< Base material made of glass fiber >>
In the embodiment of the present invention, as a base material made of glass fiber, for example, glass cloth, web, mat, glass nonwoven fabric, etc., in which glass fibers are crossed two-dimensionally or three-dimensionally at a right angle or a predetermined angle Can be used. Among these, glass cloth is preferable from the viewpoint of mechanical strength.

  When the glass fiber is provided in the form of a tape, a continuous fiber having a maximum length of about 50 m in which the tape is used is preferable, but shorter glass fibers can be mixed.

  Each glass fiber (yarn) preferably has a diameter of 4 to 20 μm, but is not limited thereto. In some cases, glass flakes, glass particles and the like can be mixed.

  The cross-sectional shape of the glass fiber is generally substantially circular, but is not limited thereto.

  The substrate made of glass fibers preferably has a fiber density of 50 to 100 (lines / 25 mm). As a result, for example, mechanical properties and moldability are improved.

  Since the embodiment of the present invention relates to an insulating material, it is preferable that the base material made of glass fiber which is a constituent material of the insulating material also has high insulation. Therefore, the glass fiber is preferably E glass used for electrical insulation. And it is preferable that glass fiber has high intensity | strength.

  In the insulating material according to the embodiment of the present invention, the base material made of glass fiber is not limited to one made only of glass fiber, and if necessary, fiber material made of other materials other than glass is mixed. can do. Examples of fiber materials other than glass include alumina fibers, aramid fibers, and other organic fibers. By this, for example, there are cases where improvement in shape retention of a substrate made of glass fiber, suppression of elongation, improvement in heat dissipation, and the like can be achieved.

  The thickness of the substrate made of glass fiber varies depending on the specific use, purpose, etc. of the insulating material according to the embodiment of the present invention, but is generally 0.015-0.2 mm, preferably 0.025-0. .05 mm. When the thickness of the base material made of glass fiber is within the above range, it is particularly preferable in terms of, for example, moldability, resin permeability, workability, and the like.

  The outer shape and size of the base material made of glass fiber can be appropriately determined according to the specific application, purpose, etc. of the insulating material according to the embodiment of the present invention. Preferred specific examples of the substrate made of glass fiber used for the insulating material according to the embodiment of the present invention include, for example, a sheet-like material having a long side of 1 to 20 m and a short side of 20 to 200 cm, and a width of 1.5 to A 4.0 cm tape-like material is included.

  Moreover, the glass fiber which comprises the base material which consists of glass fibers can perform a surface treatment as needed. By performing this treatment, it is possible to improve the contact property and the binding property with the predetermined “particle-containing resin material” (detailed later) used in the embodiment of the present invention. In some cases, impregnation and retention can be improved.

<Particle-containing resin material>
The “particle-containing resin material” in the insulating material according to the embodiment of the present invention is a resin including “an epoxy resin having two or more epoxy groups per molecule”, “a curing agent for epoxy resin”, and “a novolac resin”. It contains 10 to 40 parts by weight of 100 parts by weight of material and “silicon oxide particles having a particle size of 50 nm or less”. Here, “comprising” means the listed components (that is, “epoxy resin having two or more epoxy groups per molecule”, “curing agent for epoxy resin”, “novolak type resin” and “grain” It means what comprises silicon oxide particles having a diameter of 50 nm or less ") as essential components. Therefore, the “particle-containing resin material” comprising the above essential components and components other than these essential components also corresponds to the “particle-containing resin material” in the embodiment of the present invention.

<< Epoxy resin with 2 or more epoxy groups per molecule >>
Preferred examples of such epoxy resins include bisphenol A type epoxy resins, brominated bisphenol A type epoxy resins, hydrogenated products obtained by condensation of epichlorohydrin with polyhydric phenols such as bisphenols and polyhydric alcohols. Examples thereof include bisphenol A type epoxy resins and bisphenol F type epoxy resins. These can be used alone or in combination of two or more.

<< Curing agent for epoxy resin >>
Preferable specific examples of the epoxy resin curing agent used in the insulating material according to the embodiment of the present invention include phthalic anhydride, hexahydrophthalic anhydride, 4-methylhexahydrophthalic acid, tetrahydrophthalic anhydride, 4-methyltetrahydro Phthalic anhydride, tetrabromophthalic anhydride, nadic anhydride, methyl nadic anhydride, trimellitic anhydride, pyromellitic anhydride, anhydrous head acid, methyl hymic anhydride, dodecenyl succinic anhydride, polyazeline anhydride, benzophenone tetra Examples thereof include carboxylic acid. These may be used alone or in combination of two or more. In addition, the hardening accelerator which accelerates | stimulates or controls the hardening reaction of an epoxy resin with said epoxy resin hardening | curing agent as needed can be used. Examples of such curing accelerators include tertiary amines and salts thereof, quaternary ammonium compounds, imidazoles, and alkali metal alkoxides.

<< Novolac type resin >>
Examples of the novolak type resin used in the insulating material according to the embodiment of the present invention include novolac type phenol resin and novolac type epoxy resin. The novolak-type phenol resin has a structure in which _two phenol-derived benzene rings are bonded with CH _{2. As} the novolak-type epoxy resin, a phenol novolak-type epoxy obtained by glycidyl etherification of phenol novolak or o-cresol novolak is used. Mention may be made of resins and orthocresol novolac-type epoxy resins.

As such a novolak type resin, for example, a jER152,154 phenol novolac type epoxy resin manufactured by Mitsubishi Chemical Corporation, or an EPICLON N660 resin manufactured by DIC Corporation was subjected to a treatment such as a coupling agent addition as it is. It can be used later. ]
<< Resin composition >>
As described above, the resin material used in the insulating material in the embodiment of the present invention includes “epoxy resin having two or more epoxy groups per molecule”, “curing agent for epoxy resin”, and “novolak type resin”. It is included as an essential component.

  The proportions of these essential components are, for example, specific uses and purposes of the insulating material according to the embodiment of the present invention, workability when impregnating the above-mentioned “substrate made of glass fiber”, curing temperature, shelf life, It can be determined appropriately in consideration of cost and the like.

  The preferred proportions of these essential components in the resin material are as follows.

(A) Epoxy resin having two or more epoxy groups per molecule “The proportion of the epoxy resin (a) having two or more epoxy groups per molecule is preferably 25 to 45 parts by weight, particularly preferably 35. (Wherein the proportion of the epoxy resin (a) having two or more epoxy groups per molecule is the epoxy resin (a), the epoxy resin curing agent (b), (The total amount with the novolac resin (c) is 100 parts by weight.) ”
(B) Curing agent for epoxy resin The proportion of the curing agent for epoxy resin (b) is preferably 30 to 50 parts by weight, particularly preferably 35 to 45 parts by weight. (Here, the epoxy resin curing agent (b) is present in an epoxy resin (a) having two or more epoxy groups per molecule, this epoxy resin curing agent (b), and a novolac resin ( (The sum of c) is 100 parts by weight.)
(C) “Novolac resin”
The proportion of the novolac resin (c) is preferably 20 to 45 parts by weight, particularly preferably 30 to 40 parts by weight. (Here, the novolac resin (c) is present in an epoxy resin (a) having two or more epoxy groups per molecule, a curing agent for epoxy resin (b), and this novolac resin (c). And the total of 100 parts by weight.)
These compounding ratios of the epoxy resin (a) having two or more epoxy groups per molecule, the curing agent for epoxy resin (b) and the novolac resin (c) are heat resistance, shelf life, workability. However, it may be carried out at a blending ratio other than the above as long as the required characteristics can be satisfied under predetermined curing conditions.

<< Silicon oxide particles >>
The “particle-containing resin material” in the insulating material according to the embodiment of the present invention includes 100 parts by weight of the above-mentioned “resin material” and 10 to 40 parts by weight of “silicon oxide particles having a particle size of 50 nm or less”. . The content of silicon oxide particles having a particle size of 50 nm or less is preferably 10 to 30 parts by weight, particularly preferably 15 to 25 parts by weight. When the content of silicon oxide particles having a particle size of 50 nm or less is within the above range, it is possible to improve the electric charging life characteristics.

Examples of the silicon oxide particles include silicon monoxide (SiO), silicon dioxide (SiO ₂ ), silicon oxide (Si ₃ O ₂ ), and mixtures thereof, but in the embodiment of the present invention, It is common and preferred to use silicon monoxide (SiO), silicon dioxide (SiO ₂ ), or a mixture thereof.

  The particle size of the silicon oxide particles is 50 nm or less, particularly preferably 20 to 50 nm. Here, the particle size is determined by a laser diffraction method. The silicon oxide particles having a particle size within the above range are preferable because the electric charging life characteristics are improved.

  The “particle-containing resin material” according to the embodiment of the present invention includes 10 to 40 parts by weight of “silicon oxide particles having a particle size of 50 nm or less”. Therefore, as long as it contains 10 to 40 parts by weight of “silicon oxide particles having a particle size of 50 nm or less”, for example, silicon oxide particles having a particle size exceeding 50 nm and other types of particles are also included in the implementation of the present invention. It corresponds to the “particle-containing resin material” in the form.

  In the insulating material according to the embodiment of the present invention, by using the particle-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a particle size of 50 nm or less, the electric charge can be applied without impairing other characteristics. It is possible to improve the life characteristics. For example, with insulating inorganic materials other than silicon oxide such as montmorillonite, it is difficult to achieve a resin with such a high filling and excellent viscosity characteristics, or there are many voids after molding. Therefore, the purpose and effect of using silicon oxide particles having a specific particle size within a specific range are completely unexpected from the conventional knowledge.

<Insulating Material Manufacturing Method>
An insulating material manufacturing method according to an embodiment of the present invention includes a resin material 100 including a glass fiber base material including an epoxy resin having two or more epoxy groups per molecule, an epoxy resin curing agent, and a novolac resin. Impregnating a base material made of the glass fiber together with a solvent with a particle-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a weight part of 50 nm or less, and then volatilizing and removing the solvent. It is characterized by.

  A substrate made of glass fiber, an epoxy resin having two or more epoxy groups per molecule, a curing agent for epoxy resin, a novolac resin, an oxidation having a particle size of 50 nm or less, which is used in the method for producing an insulating material according to this embodiment The silicon particles and the particle-containing resin material are as described in detail above.

<< Solvent >>
Examples of the solvent in the method for producing an insulating material according to the embodiment of the present invention include an epoxy resin having two or more epoxy groups per molecule, a curing agent for epoxy resin, a novolac resin, and silicon oxide particles having a particle size of 50 nm or less. And the particle-containing resin material can be dissolved or dispersed, and after the glass fiber substrate is impregnated with a solution or dispersion of this solvent and each of the above components, it is easily volatilized and removed from the glass fiber substrate. Various solvents that can be used can be used.

  By using the solvent in this manner, it becomes easy to impregnate the substrate made of glass fiber with the above-mentioned resin material and particle-containing resin material containing silicon oxide particles, and at the same time, on the surface and inside of the substrate made of glass fiber. Aggregation and uneven distribution of silicon oxide particles can be suppressed.

  Preferable specific examples of the solvent include, for example, methyl ethyl ketone, methyl isobutyl ketone, acetone, and toluene. Of these, methyl ethyl ketone and toluene are particularly preferred.

  The amount of the solvent used is 10 to 50 parts by weight, preferably 20 to 40 parts by weight when the total of the above resin materials and silicon oxide particles is 100 parts by weight. The specific content and blending ratio of the material and silicon oxide particles, the viscosity, the ease of drying, the effect of use, and the like can be appropriately determined within the above range.

  Thus, by impregnating the base material made of the glass fiber with the particle-containing resin material together with the solvent, the particles (that is, silicon oxide particles) are not agglomerated to the inside of the base material made of the glass fiber. It becomes easy to penetrate sufficiently.

<< Insulating Material Manufacturing Method (Specific Example) >>
In the method for manufacturing an insulating material according to the embodiment of the present invention, a resin material 100 including an epoxy resin having two or more epoxy groups per molecule, a curing agent for epoxy resin, and a novolac resin on a substrate made of glass fiber. Particulate-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a part by weight and a particle size of 50 nm or less is impregnated into a substrate made of the glass fiber together with a solvent, and then at least a part of the solvent is added. Volatilization removal is performed from the base material which consists of said glass fiber.

  When impregnating the above-mentioned particle-containing resin material and solvent into a substrate made of glass fiber, a solution containing these particle-containing resin material and solvent (hereinafter sometimes referred to as “impregnating liquid” in this specification) is previously stored. It is preferable that the substrate made of glass fiber is impregnated with this impregnating solution.

  When preparing this impregnating liquid, each component (that is, epoxy resin having two or more epoxy groups per molecule, epoxy resin curing agent, novolac resin, silicon oxide particles having a particle size of 50 nm or less, and a solvent) The blending order and blending method are arbitrary as long as the object and effect of the present invention can be achieved. For example, it can be prepared by blending all the components of the above-mentioned components at the same time, or can be prepared by blending one or more of the above-mentioned components separately. Moreover, each component can be added and compounded continuously or stepwise.

  When preparing the impregnating liquid, it is preferable to stir when and / or after blending the components so as to obtain a uniform mixture of the components described above. The impregnation liquid is usually prepared at room temperature, but can also be performed under slight cooling or heating.

  In addition, under the coexistence conditions of an epoxy resin having two or more epoxy groups per molecule and a curing agent for epoxy resin, an increase in the viscosity of the preparation solution, which is considered to be mainly caused by curing of the epoxy resin, is observed. In some cases, it is difficult to perform uniform mixing quickly. However, this is because one or both of these two components are close to the final stage of preparation so that the contact opportunity or contact time between the epoxy resin having two or more epoxy groups per molecule and the curing agent for epoxy resin is reduced. Or by adding a solvent by the time these two components are blended.

  When impregnating the substrate made of glass fiber with the impregnating liquid prepared from the above components, various methods can be employed. For example, a method of applying an impregnating solution to a substrate made of glass fiber, a method of immersing a substrate made of glass fiber in the impregnating solution, a method of dropping or spraying the impregnating solution on a substrate made of glass can be employed.

  The impregnating liquid is preferably filled with a sufficient amount of the impregnating liquid up to the inside of the substrate made of glass fibers. Therefore, the impregnating liquid is filled up to the gap between the glass fibers forming the glass fiber base. It is preferable to sufficiently impregnate until the impregnating liquid is replaced as much as possible (preferably substantially the entire amount) of the air existing in the gap. In addition, a sufficient amount of impregnating liquid can be applied until a coating liquid layer free of glass fibers is formed on the surface of the substrate made of glass fibers.

  In the method for manufacturing an insulating material according to the embodiment of the present invention, the solvent is then volatilized and removed from the substrate made of the glass fiber. The removal of the solvent can be performed at room temperature and normal pressure, or can be performed under reduced pressure under heating conditions. When performed under heating conditions, it can be performed usually within a temperature range of 120 to 180 ° C, preferably 130 to 150 ° C. Under temperature conditions higher than this temperature range, solvent removal or resin curing may partially proceed excessively.

  As described above, the insulating material according to the embodiment of the present invention can be manufactured.

<Insulated coil and manufacturing method thereof>
An insulating coil according to an embodiment of the present invention is characterized by comprising a conductor and a cured product of the insulating material covering the conductor.

  As a preferred specific example of the insulating coil according to the embodiment, the one shown in FIG. 2 can be cited. The insulating coil according to the embodiment shown in FIG. 2 is composed of a conductor 4 and a cured product 5 of the above-described insulating material covering the conductor 4.

<< Insulating coil manufacturing method (first manufacturing method) >>
An insulating coil manufacturing method (first manufacturing method) according to an embodiment of the present invention is a method in which a wound body obtained by winding the insulating material around a surface of a conductor is thermoformed to cure the insulating material. It is characterized by making it.

  The conductor has electrical insulation. Specifically, it is particularly preferable that it can function as a coil for high-voltage equipment. As a particularly preferable specific example of the coil for such a high voltage device, for example, the one described in FIG. 3 can be cited.

  The insulating material can be wound at a right angle with respect to the cross-sectional direction of the conductor, or at a predetermined angle with respect to the cross-sectional direction of the conductor and spirally wound around the conductor. In the embodiment of the present invention, it is preferable to spirally wind around the conductor.

  The number of windings of the insulating material is arbitrary. For example, the thickness can be appropriately determined in consideration of the thickness of the insulating material, required insulation, workability, strength, durability, and the like. Therefore, for example, when the required insulating property is relatively low and the required insulating property can be realized by a single insulating material, the number of windings of the insulating material may be one. On the other hand, when the required insulation is high, the insulation is thin, or when a higher degree of insulation and durability is required, the number of turns of the insulation can be determined accordingly. .

  In the method for manufacturing an insulating coil according to the embodiment of the present invention (first manufacturing method), a wound body obtained by winding this insulating material is thermoformed to cure the insulating material. .

  The temperature of this thermoforming can be performed within a temperature range of usually 120 to 180 ° C, preferably 130 to 150 ° C. The time for thermoforming is usually in the range of 120 to 600 minutes, preferably 300 to 600 minutes. And it is preferable to perform this thermoforming under the pressurization conditions from the outside. Heat molding under such pressure conditions can be easily performed, for example, by adopting vacuum pressure curing molding, for example.

  As described above, the insulating material according to the embodiment of the present invention can be manufactured.

<< Insulating coil manufacturing method (second manufacturing method) >>
In the insulating coil manufacturing method (second manufacturing method) according to the embodiment of the present invention, the wound body obtained by winding the insulating material around the surface of the conductor is subjected to deaeration treatment, and then heated. The insulating material is cured by molding.

  Here, the contents of the conductor and the insulating layer, the contents of winding, the contents of thermoforming, and the like are the same as in the first manufacturing method described above.

  In this second manufacturing method, a wound body obtained by winding an insulating material around the surface of a conductor is subjected to deaeration treatment. By performing such a deaeration process, gas (mainly oxygen) etc. are removed from the inside of a wound body, and a denser wound body can be obtained. As a result, a higher degree of insulation and mechanical strength can be obtained, and the durability and the like can be further improved.

<< Insulating coil manufacturing method (third manufacturing method) >>
An insulating coil manufacturing method (third manufacturing method) according to an embodiment of the present invention includes a wound body obtained by winding the insulating material around the surface of a conductor, subjected to deaeration treatment, and then wound. The rotating body is impregnated with a thermosetting resin, and then the insulating material is cured by thermoforming.

  Here, the content of the conductor and the insulating layer, the content of winding, the content of deaeration treatment, the content of thermoforming, and the like are the same as in the second manufacturing method described above.

  In the third manufacturing method, the wound body obtained by winding the insulating material is subjected to a deaeration treatment, and then the wound body is impregnated with a thermosetting resin. By impregnating with such a thermosetting resin, a denser wound body can be obtained.

  This is, for example, even when a void portion remains inside the wound body due to winding unevenness when obtaining the wound body, deformation due to tension applied at the time of winding or recovery thereof, etc. This is because the void can be reduced by allowing the thermosetting resin to penetrate into the void. In addition, this thermosetting resin may be able to realize stronger bonding or adhesion of a base material (and epoxy resin, novolac resin, etc.) made of wound glass fiber. As a result, a higher degree of insulation and mechanical strength can be obtained, and the durability and the like can be further improved.

  Examples of the thermosetting resin include the components of the resin material constituting the particle-containing resin material of the insulating material (that is, epoxy resin having two or more epoxy groups per molecule, curing agent for epoxy resin, novolac) Type resin) and is preferably incompatible.

  This may facilitate the penetration of the thermoplastic resin into the voids inside the wound body. Further, in the case of such an incompatible material, leakage of the resin material component constituting the particle-containing resin material into the thermoplastic resin is suppressed when the thermoplastic resin is applied to the wound body. Therefore, the density reduction of the winding body by this leakage, the fall of insulation, mechanical strength, etc. are prevented. Further, since the thermoplastic resin used for the impregnation treatment is prevented from being contaminated by the resin material component constituting the particle-containing resin material, it is advantageous when the thermoplastic resin is reused.

<Use of insulating material>
The insulating material according to the embodiment of the present invention can cope with mechanical stress such as high centrifugal force and bending stress in addition to its excellent insulation properties, arc resistance performance, and heat resistance, and can cope with such mechanical stress. Even if it is repeatedly exposed for a long period of time, it has a high durability that can maintain an excellent insulating property above a certain level for a long period of time.

  Therefore, the insulating material according to the embodiment of the present invention can be applied in various fields, and is more useful than the conventional insulating material of this type.

  High insulation, mechanical strength, and excellent durability make it possible to reduce the weight of insulation material and reduce the thickness of the insulation layer, thereby reducing the size and output of various electrical devices and machines. It becomes possible to plan.

  Applications in which the usefulness of the insulating material according to the embodiment of the present invention is particularly noticeable include, for example, insulation coils for high-voltage equipment, rotor coils, particularly wound rotor coils, indirect hydrogen cooling, or direct water cooling Insulating coils suitable for a turbine generator of the type (see FIG. 3), in particular, a stator coil (see FIG. 4), and a rotating electric machine and a variable speed pumped-water generator / motor equipped with the insulating coil.

  The following examples show in more detail some particularly preferred representative examples of the insulating materials according to the above-described embodiments. Therefore, the present invention is not limited to the technical scope specifically disclosed in the embodiments shown below.

<Example 1>
Hereinafter, an insulating material according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 shows a glass fiber substrate (1) (weight 80 g), 60 parts by weight of an epoxy resin having two or more epoxy groups per molecule, 60 parts by weight of a curing agent for epoxy resin, and 40 weights of a novolac resin. Part-containing resin material (100 g) containing 100 parts by weight of a resin material and 10 parts by weight of silicon oxide particles (2) having a particle size of 50 nm or less.

  The substrate made of glass fiber has a thickness of 0.025 mm. A bisphenol A type epoxy resin was used as the epoxy resin, and an acid anhydride (specifically, HN2200 manufactured by Hitachi Chemical Co., Ltd.) was used as the curing agent.

  The impregnation with the resin material was performed by immersing the substrate made of the glass fiber in a mixture of the resin material stored in a tray at room temperature for 2 minutes. After pulling up the base material made of glass fiber impregnated with the resin material from the tray, the base material made of glass fiber contains about 40% of the resin material containing the above particles from the amount of the resin material remaining in the tray. It was found that it was impregnated.

  A base material made of glass fiber impregnated with the resin material resin containing particles was held at a temperature of 100 ° C. for 25 minutes to obtain a prepreg sheet. This prepreg sheet had a thickness of 0.035 mm.

After preparing 10 sheets of this prepreg, laminating and stacking them, heating consisting of holding at a temperature of 160 ° C. for 120 minutes while pressing with a pressure of 6 kg / cm ² from above and below. The insulating material according to the embodiment of the present invention was manufactured by being subjected to a curing process. The thickness of this insulating material was 0.3 mm.

  When a voltage application test was performed on this insulating material at 6 kVrms, no breakdown of the insulating layer was observed even after 500 hours had elapsed.

Next, the insulating material according to the embodiment of the present invention manufactured in the same manner as described above was cut into a 25 mm wide tape. The insulating material cut into the above tape shape is wound on a product obtained by winding a release tape (thickness 0.02 mm made of Teflon resin) on a linear aluminum conductor (cross section 10 mm x 50 mm) simulating a conductor. After turning, the conductor and the insulating material according to the embodiment of the present invention are subjected to a heat curing process consisting of holding at a temperature of 150 ° C. for 300 minutes while pressing at a pressure of 6 kg / cm ² from the surroundings. An insulating coil was produced.

  With respect to this insulating coil, the bending strength was measured by a three-point bending test method based on JIS K6911.

<Example 2>
A base material (weight 80 g) made of glass fiber impregnated with a resin material containing particles by the same method as in Example 1 except that the mixing ratio of silicon oxide particles having a particle size of 50 nm or less to the resin material was changed to 30 parts by weight. ), And a prepreg sheet was obtained.

  Next, the same heat curing treatment as in Example 1 was performed to manufacture the insulating material according to the embodiment of the present invention. The thickness of this insulating material was 0.3 mm.

  As in Example 1, when an electrical charging test was performed on this insulating material at 6 kVrms, no breakdown of the insulating layer was observed after 500 hours.

  Further, as in Example 1, an insulating coil made of a conductor and an insulating material according to an embodiment of the present invention was manufactured. With respect to this insulating coil, the bending strength was measured by a three-point bending test method based on JIS K6911.

<Comparative Example 1>
A substrate made of glass fiber impregnated with the resin composition was produced by the same method as in Example 1 except that silicon oxide particles having a particle size of 50 nm or less were not used.

  About this, when the electrical charging test was implemented at 6 kVrms similarly to Example 1, the insulating layer destroyed after 6-hour progress.

  According to at least one embodiment described above, an insulating material having excellent insulating properties and mechanical strength can be obtained. Such an insulating material provides, for example, a coil insulation structure that provides long-term reliability even in high voltage equipment, especially coils that are subject to high mechanical stress, and winding coils of pumped-up generator motors that are frequently started and stopped. Therefore, it is extremely effective practically.

DESCRIPTION OF SYMBOLS 1 Base material which consists of glass fiber 2 Silicon oxide particle 3 Resin material 4 Conductor 5 Hardened | cured material of an insulating material 6 Coil for high voltage equipment 7 Stator coil 8 Stator iron core 9 Rotor 10 Cooling water piping 11 Coil insulation layer 12 Conductor 13 Water hole

Claims (11)

  100 parts by weight of a resin material containing (a) an epoxy resin having two or more epoxy groups per molecule, (b) a curing agent for epoxy resin, and (c) a novolac resin in a base material made of glass fiber; (D) An insulating material characterized by holding a particle-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a particle size of 50 nm or less.   The insulating material according to claim 1, which is an insulating material for high-voltage equipment.   100 parts by weight of a resin material containing (a) an epoxy resin having two or more epoxy groups per molecule, (b) a curing agent for epoxy resin, and (c) a novolac resin, d) impregnating a substrate made of the above glass fiber with a particle-containing resin material containing 10 to 40 parts by weight of silicon oxide particles having a particle size of 50 nm or less together with a solvent, and then volatilizing and removing the solvent. A method for producing an insulating material, which is characterized.   An insulating coil comprising a conductor and a cured product of the insulating material according to claim 1 covering the conductor.   A method for producing an insulating coil, comprising: heating and molding a wound body obtained by winding the insulating material according to claim 1 around a surface of a conductor to cure the insulating material.   The wound body obtained by winding the insulating material according to claim 1 around the surface of the conductor is subjected to a deaeration treatment, and then heat-molded to cure the insulating material. An insulating coil manufacturing method.   The wound body obtained by winding the insulating material according to claim 1 on the surface of the conductor is subjected to deaeration treatment, and then the wound body is impregnated with a thermosetting resin, and then heated. A method for producing an insulating coil, wherein the insulating material is cured by molding.   The thermosetting resin impregnated in the wound body is incompatible with the component of the resin material constituting the particle-containing resin material of the insulating material under the temperature condition at the time of impregnation. 8. A method for manufacturing an insulating coil according to 7.   The insulating coil according to claim 4, which is an insulating coil for a rotating electric machine.   A rotating electrical machine comprising a wound rotor coil formed using the insulating coil according to claim 9.   A variable speed pumped-water generator-motor, comprising a wound rotor coil formed using the insulating coil according to claim 9.

Images