WO2016104141A1 - Bande isolante et son procédé de fabrication, bobine de stator et son procédé de fabrication, et générateur - Google Patents

Bande isolante et son procédé de fabrication, bobine de stator et son procédé de fabrication, et générateur Download PDF

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Publication number
WO2016104141A1
WO2016104141A1 PCT/JP2015/084470 JP2015084470W WO2016104141A1 WO 2016104141 A1 WO2016104141 A1 WO 2016104141A1 JP 2015084470 W JP2015084470 W JP 2015084470W WO 2016104141 A1 WO2016104141 A1 WO 2016104141A1
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WIPO (PCT)
Prior art keywords
mica
insulating tape
nanofiller
layer
coil
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PCT/JP2015/084470
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English (en)
Japanese (ja)
Inventor
馬渕　貴裕
あずさ 大澤
茂之 山本
久保　一樹
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三菱電機株式会社
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Priority to JP2016530032A priority Critical patent/JPWO2016104141A1/ja
Publication of WO2016104141A1 publication Critical patent/WO2016104141A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/60—Composite insulating bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material

Definitions

  • the present invention relates to an insulating tape used for a stator of a rotating electrical machine, a manufacturing method thereof, a stator coil using the insulating tape, a manufacturing method thereof, and a generator using the insulating tape.
  • the stator of a rotating electrical machine has a stator coil housed in a plurality of slots formed on the inner peripheral side of the stator core.
  • the stator coil includes a coil conductor made of a good conductor metal such as copper, and a stator coil insulator covering the coil conductor.
  • the stator coil in a large rotating electrical machine is made of a low-viscosity liquid thermosetting resin composition (insulating varnish) that is wound around a coil conductor with an insulating tape in which a fiber reinforcing material such as a glass cloth is bonded to a mica sheet. After impregnation under reduced pressure, it is manufactured by heating while being press-molded so as to have a predetermined cross-sectional shape.
  • the stator coil is housed in a multi-stage shape such as two upper and lower stages in the slot, and a spacer is inserted between the stator coils and a wedge is fixed to the opening end of the slot.
  • the electromagnetic vibration generated from the stator coil during operation of the rotating electrical machine is suppressed by inserting.
  • the insulator of the stator coil is always placed in an environment exposed to high electrical stress. Further, such a rotating electric machine is used for a long period of 20 years or more, and it is important to improve the reliability of the product by improving the withstand voltage of the insulator.
  • a flexible insulating tape comprising a flexible base material and a mica base material structure bonded to the base material, wherein the mica base material structure includes the base material mica, an insulating resin, and nanoclay.
  • the mica base material structure includes the base material mica, an insulating resin, and nanoclay.
  • an adhesive is used to support the nanofiller on the insulating tape.
  • the adhesive for carrying the filler and the insulating varnish used for impregnation are required to have good compatibility and to be integrated with the adhesive and the insulating varnish during heat curing.
  • the nanofiller carried on the insulating tape by the adhesive is mixed with the varnish after the adhesive is dissolved in the varnish. Then, the insulating tape has a fluid state.
  • the nanofiller flows along with the flow of the adhesive, the aggregation of the nanofillers easily proceeds, so that aggregated secondary particles are formed and the particle size increases. Therefore, the specific surface area of the nanofiller becomes small, and there is a problem that it is difficult to obtain the voltage resistance improvement effect peculiar to the nanofiller.
  • the present invention solves the above problems, and as described later, the nanofiller is unevenly distributed on one side of the mica particle surface, and when impregnated with the varnish, the nanofiller is insoluble in the varnish. Since it is covered with molecules, the state in which the nanofiller is supported on the insulating tape is maintained. Thereby, aggregation of the nano filler does not proceed, and a large specific surface area specific to the nano filler can be maintained even in the state after impregnation with the varnish. This effect makes it possible to increase the reliability of the product by improving the voltage resistance of the insulating tape.
  • the present invention comprises a mica layer comprising scaly mica particles, a water-soluble polymer, a nanofiller supported by the water-soluble polymer and unevenly distributed on one surface of the mica particles, and laminated on the mica layer.
  • An insulating tape comprising a reinforcing layer including a fiber reinforcing material.
  • the present invention also includes a step of forming a mica layer by making a dispersion containing mica particles, and a nanofiller and a water-soluble polymer after the reinforcing layer containing a fiber reinforcing material is bonded to the mica layer. And a step of applying the mixed liquid to the mica layer.
  • the present invention includes a stator having a coil conductor and an insulating layer formed by winding an insulating tape around the coil conductor and impregnating the insulating tape with a liquid thermosetting resin composition and heating and press-molding it. It is a coil.
  • the present invention includes a step of winding the insulating tape around a coil conductor, and a step of impregnating the insulating tape with a liquid thermosetting resin composition and heat-press molding to manufacture a stator coil, Is the method.
  • the present invention is a generator comprising an iron core having a plurality of slots and a coil inserted into the plurality of slots, the coil having an insulating tape wound around the outer periphery of the coil conductor, A generator having a mica layer containing flat mica particles and a nanofiller supported by a water-soluble polymer and unevenly distributed on one surface of the mica particles, and a reinforcing layer laminated on the mica layer.
  • the nanofiller is unevenly distributed on one side of the mica particle surface, and the nanofiller is covered with the water-soluble polymer insoluble in the varnish, so the nanofiller is supported on the insulating tape. Maintained. Thereby, the aggregation of the nano filler does not proceed, the large specific surface area specific to the nano filler can be maintained even after the varnish impregnation, and the insulating tape capable of improving the withstand voltage of the insulator and its production A method can be provided.
  • FIG. 1 It is a schematic cross section of the insulating tape by Embodiment 1 of this invention. It is a model expanded sectional view of the mica layer of the insulating tape by Embodiment 1 of this invention. It is a partial expansion perspective view of the stator of a rotary electric machine. It is a flowchart which shows the manufacturing process of the insulating tape by Embodiment 1 of this invention. It is the graph which showed relatively the dielectric breakdown voltage of the coil of the Example which concerns on Embodiment 2 of this invention, and a comparative example. It is sectional drawing of the rotary electric machine by Embodiment 3 of this invention. It is a fragmentary sectional view which shows the stator coil in the slot of the rotary electric machine by Embodiment 3 of this invention. It is a figure which shows the shape of the coil conductor used for the stator coil of a rotary electric machine.
  • FIG. 1 is a schematic cross-sectional view of an insulating tape according to the first embodiment.
  • an insulating tape 1 includes a mica particle 3 that is a flat thin piece, a mica layer 5 including a nanofiller 2 that is unevenly distributed on one surface of the mica particle 3, and a water-soluble polymer 4, and a mica layer.
  • a reinforcing layer 7 including a fiber reinforcing material 6 laminated on the substrate 5.
  • the insulating tape 1 of the present invention comprises two layers, a mica layer 5 and a reinforcing layer 7 as a support material for the mica layer 5. Each layer is made of a material having the structure described later.
  • the reinforcing layer 7 of the present invention is provided to withstand the winding tension applied to the insulating tape when the stator coil of the insulating tape is wound. Further, it is provided to maintain the strength of the composite of the insulating tape and resin after impregnating the varnish. Any fiber or film can be used as long as it meets these purposes.
  • the fiber reinforcing material 6 examples include woven fabrics such as glass fibers, alumina fibers, and polyamide fibers. Moreover, you may use the film which expresses not only a fiber but the same function. Examples of the film include a polyimide film, a polyamide film, and a polyester film. Note that the present invention is not limited to these as long as it meets the above purpose. Among these, the insulating tape using glass fiber is excellent in terms of good characteristics and low cost.
  • the mica layer 5 of the present invention is characterized in that it contains mica particles 3, nanofillers (nano-sized insulating inorganic particles) 2, and a water-soluble polymer 4 as an adhesive.
  • the mica particles 3 hard mica (mascobite), soft mica (phlogopite), etc., which are known as a kind of layered silicate mineral, can be used.
  • the shape of the mica particles 2 include block mica, peeled mica, and laminated mica. These may be used alone or in combination of two or more. Among these, it is preferable to use laminated mica for the mica layer 5 in that the thickness is uniform and the cost is low.
  • the content of mica particles 3 is preferably 100 g to 200 g per 1 m 2 of insulating tape.
  • the content of the mica particles 3 is less than 100 g / m 2 , desired voltage resistance may not be obtained, and the dielectric breakdown time at the time of power degradation may be shortened.
  • the content of the mica particles 3 exceeds 200 g / m 2 , although the electric insulation is good, the insulating tape 1 may be thick and difficult to wind.
  • These mica particles 3 have a scaly shape and are stacked in the thickness direction of the insulating tape. Between these particles, the particles to be stacked overlap each other, the shape of the particles and the position of the particles are different in the stacking direction, and the particles are arranged in a shifted manner.
  • a nano filler 2 described later may be interposed between particles to be laminated.
  • mica particles 3 are obtained by refining mica raw ore by water pulverization, shear pulverization, etc., and the average particle size of mica particles 3 was monodispersed with a laser diffraction particle size distribution meter.
  • the average particle size in the state is 50 to 800 ⁇ m, it is desirable that the insulating tape is easily wound when the stator coil is wound.
  • the thickness of the mica particles 3 is desirably 30 ⁇ m or less, and in particular, the average thickness is desirably 1 to 15 ⁇ m.
  • varnish has low voltage resistance and is eroded by partial discharge
  • scaly mica particles have high voltage resistance and are partially It is known that erosion due to electric discharge hardly occurs. Therefore, in general, the insulator of the coil is installed so that the direction of the laminated surface of the mica particles is aligned perpendicular to the electric field direction of the coil.
  • the dielectric breakdown erodes the resin.
  • the breakdown path changes to the direction along the mica particle stacking surface, erodes to the end of the mica particles, and the varnish dielectric breakdown proceeds again in the direction of the electric field. Is considered to progress.
  • the aspect ratio of the mica particles is determined by the ratio between the average particle diameter and the average thickness. However, the aspect ratio of the mica particles is large as estimated from the dielectric breakdown mechanism between the insulating tape and the resin composite described above, or the average particles A large diameter is considered to be advantageous for withstand voltage.
  • the nanofiller 2 is not particularly limited as long as it is an insulating inorganic particle, and examples thereof include silica, alumina, magnesium oxide, zinc oxide, magnesium carbonate, graphite boron nitride, titanium boride, silicon carbide, and silicon nitride. And smectites such as aluminum nitride, montmorillonite, beidellite and hectorite. Among these, silica is particularly preferable as a material for the nanofiller 2 because of its low dielectric constant and good partial discharge characteristics in the insulator.
  • the shape of the nanofiller may be any of spherical, elliptical, needle-shaped, flake shaped, etc., but depending on the shape of the filler particles, there is variation in electrical insulation due to anisotropic thermal conductivity.
  • the particle shape is preferably spherical from the viewpoint of preventing the variation.
  • the nanofiller 2 is preferably a laser diffraction particle size distribution meter and has an average particle size of 5 to 500 nm in a monodispersed state.
  • the thickness is 500 nm or more, a large gap is generated between the mica particles 3 when arranged between the stacked mica particles 3, and the interaction due to the intermolecular force between the mica particles 3 is reduced. If the intermolecular force between the mica particles 3 is lost, the insulating tape itself becomes brittle, and there is a case in which it cannot be wound around the stator coil.
  • FIG. 2 is a schematic enlarged sectional view of the mica layer 5 of the insulating tape 1.
  • the nanofiller 2 is substantially contained in the water-soluble polymer 4 and supported on the mica particles 3, and when viewed in detail, there are voids between the mica particles 3 and the water-soluble polymer 4. (This gap is not shown in FIG. 1). After the insulating tape 1 is wound around the conductor, the gap is impregnated with an insulating varnish and filled.
  • the nanofiller 2 is unevenly distributed in one direction of the thickness direction of the insulating tape 1 on one side of the mica particles 3.
  • the nanofiller 2 is unevenly distributed in one direction of the thickness direction of the insulating tape 1 on one side of the mica particles 3.
  • the gap thickness shown in FIG. 2 is L
  • the filler 2 is characterized by being 1.5 times or more of the amount of the nanofiller 2 in the range of L / 2 or more.
  • the electrical weak point in the mica layer 5 of the insulating tape 1 is a resin such as varnish that exists in the gap between the mica particles 3 and the mica particles 3, and the nanofiller 2 reinforces these electrical weak points. .
  • Such uneven distribution of the nanofiller 2 is only required to be present at a location having a gap between the mica particles 3 and the mica particles 3, and the nanofillers 2 do not have to be unevenly distributed on the surfaces of all the mica particles 3. . This is because the part where the mica particles 3 are in close contact with each other is unlikely to become an electrical weak point. The dielectric breakdown path is caused by passing through this electrical weak point with a certain probability, and the nanofiller 2 is unevenly distributed in all parts having gaps between the mica particles 3 and the mica particles 3 constituting the mica layer 5. do not have to. However, in order to stably develop high voltage resistance, the proportion of the nanofiller 2 that is unevenly distributed as described above is 10 per 100 gaps formed by the overlap of mica particles in the cross section of the mica tape 1. It is desirable that there are more than one place.
  • the gap thickness L in FIG. 2, four tabular mica particles substantially parallel to each other are shown. From the upper side of FIG. 2, when the symbols of mica particles are A, B, C, and D, respectively, the “gap between adjacent mica particles and mica particles” in the stacking direction of mica particles includes (1) between AB and ( 2) There are 6 types between AC, (3) between AD, (4) between BC, (5) between BD, and (6) between CD. Of these, (1) is excluded from the scope of this definition because the particles are in close contact. In addition, (3) is excluded from the scope of this definition because mica particles B are interposed.
  • L is a gap composed of mica particles-mica particles, excluding the case where the gap cannot be confirmed by the adhesion of mica particles and the case where other mica particles exist in the gap.
  • the reason why it is desirable that there are 10 or more unevenly distributed locations per 100 locations formed by the overlap of the mica particles is that the gap between the mica particles 3 and the mica particles 3 which are electrical weak points.
  • the process of dielectric breakdown progressing to the ground electrode when the resin present in the dielectric is used as a breakdown path if the density is higher than the above ratio, the progress of the breakdown is suppressed to a significant level by the effect of the nanofiller, It is because an effect can be expressed.
  • the nanofiller 2 is characterized by being supported on the mica particles 3 with a water-soluble polymer 4.
  • the insulating varnish contains 50% or more of a water-insoluble component and contains a thermosetting resin.
  • the thermosetting resin include an epoxy resin, an acrylic resin, a polyester resin, and a cyanate resin.
  • the organic solvent-free type is often used. Therefore, in order to adjust the varnish viscosity, it is common to add a reactive dilution component such as styrene monomer or acrylic monomer. Since these are water-insoluble, the water-soluble polymer carrying the nanofiller does not dissolve in the varnish.
  • Water-soluble polymers used for these include gum arabic, guar gum, pectin, starch, gelatin, sodium chondroitin sulfate, or cellulose derivatives such as ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium alginate, sodium acrylate, carboxy Examples thereof include vinyl polymer, polyacrylic acid amide, polyvinyl pyrrolidone, polyvinyl alcohol, and polyethylene glycol. Among these, those selected from cellulose derivatives having excellent filler adhesiveness are preferable.
  • the nanofiller 2 carried on the insulating tape 1 by the water-soluble polymer 4 when impregnated with the varnish does not dissolve the water-soluble polymer 4 in the insulating varnish. 1 has no fluidity.
  • the addition amount of the water-soluble polymer 4 is desirably 10 g or less per 1 m 2 of the insulating tape.
  • the lower limit of the addition amount of the water-soluble polymer 4 is 0.5 g per 1 m 2 of the insulating tape.
  • the first effect is an aggregation suppressing effect of the nanofiller 2.
  • the nanofiller 2 carried on the insulating tape 1 by the water-soluble polymer 4 does not dissolve in the varnish, so that the aggregation does not proceed after the varnish impregnation. Therefore, a large specific surface area specific to the nanofiller 2 can be maintained, and an effect of improving the voltage resistance can be obtained.
  • the second effect is improvement of the upper limit of the concentration of the nanofiller 2.
  • the nanofiller 2 has a large specific surface area, it is known that the solvent viscosity increases remarkably when added in a small amount.
  • the nanofiller 3 supported on the insulating tape 1 can be used when the varnish is impregnated. Do not mix with. Therefore, the impregnating process can maintain the viscosity capable of impregnation without affecting the viscosity of the varnish. Thereby, a nano filler can be added to high concentration and the withstand voltage improvement effect is acquired.
  • the third effect is an improvement in voltage resistance due to uneven distribution of the nanofiller 2.
  • the dielectric breakdown takes a route near the surface of the mica. In the insulating material of the stator coil, an electric field in the vertical direction (vertical direction in FIG.
  • the dielectric breakdown proceeds while eroding the resin, and when the dielectric breakdown tip reaches the surface of the mica particles, The breakdown path is bent by about 90 ° and changes to the plane direction of the mica particles. After eroding to the end of the mica particles, the dielectric breakdown of the varnish proceeds again in the electric field direction, and the erosion is considered to proceed. Therefore, by making the nanofiller unevenly distributed on one surface of the mica, the filler concentration can be locally increased, and an effect can be exhibited in suppressing the progress of the dielectric breakdown path.
  • the nanofiller concentration can be locally formed in a state where the nanofiller is dispersed without being aggregated, the progress of dielectric breakdown on the surface of the mica particles can be suppressed.
  • the nanofiller 2 is supported by the water-soluble polymer 4 and the nanofiller 2 is unevenly distributed on one surface of the mica particle 3 to thereby improve the voltage resistance. Can do.
  • the tape when the tape is wound around the coil, if the entire mica particles are filled with nanoparticles, the adhesion between the mica particles is lowered and the tensile strength as the tape is lowered. Therefore, a technique for improving the adhesion by mixing mica and nanoparticles in a water-soluble polymer is conceivable, but the problem is that the impregnating property of the varnish is deteriorated. Furthermore, since the nanoparticles are randomly arranged, it is necessary to add a large amount of nanoparticles in order to improve the voltage resistance.
  • the nanoparticles are unevenly distributed in the vicinity of the plane of the mica particles, since the nanoparticles are contained in a high concentration near the surface of the mica particles serving as the dielectric breakdown path, the progress of the dielectric breakdown can be achieved with high probability. Inhibits and can withstand voltage. Furthermore, adhesive components such as insulating varnish are sufficiently contained between the mica particles, and the adhesive force between the tapes can be maintained.
  • FIG. 4 is a flowchart showing the manufacturing process of the insulating tape of the present invention.
  • the manufacturing method of the insulating tape of the first embodiment includes a step of forming a mica layer by making a dispersion containing mica particles, a step of bonding a reinforcing layer containing a fiber reinforcing material to the mica layer, and bonding And a step of applying a mixed liquid containing nanofiller and water-soluble polymer to the mica layer.
  • the insulating tape manufacturing method according to the present embodiment is manufactured by the following procedure.
  • a dispersion containing mica particles 3 is mixed (S1) and stirred (S2) to prepare a dispersion containing mica particles 3.
  • the mica layer 5 is formed by paper making using the obtained dispersion (S3).
  • Mixing (S1) and stirring (S2) may be performed simultaneously.
  • the method for preparing the dispersion liquid containing the mica particles 3 is not particularly limited, and methods known in the technical field can be used.
  • a dispersion can be prepared by dispersing mica particles 3 in water.
  • the content of the mica particles 3 in the dispersion is not particularly limited, and may be appropriately adjusted according to the type of the mica particles 3 and the like.
  • the method for producing the dispersion liquid is not particularly limited, and methods known in the technical field can be used.
  • a mica sheet to be the mica layer 3 can be obtained by making a dispersion using a commercially available paper machine.
  • the mica sheet may be bonded to various films formed of PET or polyimide, which is a different type of support material from the reinforcing layer containing the fiber reinforcing material.
  • the resin composition may be applied to the mica sheet using a known method such as a roll coater method or a spray method, and then bonded to the support material.
  • the resin composition used for bonding the mica sheet and the support material generally contains a thermosetting resin, a curing agent, and a solvent.
  • a thermosetting resin a well-known thing can be used in the said technical field.
  • Specific examples of the thermosetting resin include an epoxy resin, an unsaturated polyester resin, a phenol resin, a melamine resin, a silicone resin, and a polyimide resin.
  • epoxy resins are preferable because they are excellent in characteristics such as heat resistance and adhesiveness.
  • epoxy resin examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, orthocresol novolak type epoxy resin, phenol novolac type epoxy resin, alicyclic aliphatic epoxy resin, glycidyl-aminophenol type epoxy resin, and the like. . These resins may be used alone or in combination of two or more.
  • the curing agent is not particularly limited, and those known in the technical field can be used.
  • Specific examples of the curing agent include organometallic complexes or organometallic salts of metals such as cobalt, copper, zinc, iron, nickel, manganese, and tin.
  • Specific examples of the organometallic complex include organic cobalt complexes such as cobalt (II) acetylacetonate and cobalt (III) acetylacetonate, organic copper complexes such as copper (II) acetylacetonate, and zinc (II) acetylacetonate.
  • Organic zinc complexes such as iron (III) acetylacetonate, organic nickel complexes such as nickel (II) acetylacetonate, and organic manganese complexes such as manganese (II) acetylacetonate.
  • organic metal salt include zinc octylate, tin octylate, zinc naphthenate, cobalt naphthenate, tin stearate, and zinc stearate.
  • cobalt (II) acetylacetonate cobalt (III) acetylacetonate, zinc (II) acetylacetonate, zinc naphthenate, iron (III) acetylacetonate are Cobalt (II) acetylacetonate and zinc naphthenate are more preferable. These may be used alone or in combination of two or more.
  • the amount of the curing agent needs to be appropriately set according to the type of the thermosetting resin and the curing agent to be used, but is generally 0.1 parts by mass with respect to 100 parts by mass of the thermosetting resin. ⁇ 200 parts by mass.
  • solvent used for the said resin composition
  • a well-known thing can be used in the said technical field.
  • the solvent include organic solvents such as toluene and methyl ethyl ketone. These may be used alone or in combination of two or more.
  • the blending amount of the solvent may be appropriately adjusted according to the desired viscosity of the resin composition, and is not particularly limited.
  • the reinforcing layer 7 including the fiber reinforcing material 6 is bonded to the mica layer 5 (S4). Thereafter, a mixed solution containing the nanofiller 2 and the water-soluble polymer 4 is applied to the mica layer 4.
  • the method for bonding the fiber reinforcing material 6 to the mica sheet is not particularly limited, and methods known in the technical field can be used.
  • the mica sheet and the fiber reinforcing material 6 may be bonded together using a resin composition.
  • the resin composition is applied to the fiber reinforcing material 6 using a known method such as a roll coater method or a spray method, and the solvent in the resin composition is volatilized, and then a mica sheet is stacked thereon.
  • the laminate may be pressure-bonded by heating with a hot roll or the like under heating at 60 ° C. to 70 ° C.
  • the film as said support material can be bonded together similarly.
  • a mixed solution containing the nanofiller 2 and the water-soluble polymer 4 is prepared (S5).
  • the composition of the mixed solution is not particularly limited, and for example, a resin composition in which nanofiller 2 and water-soluble polymer 4 are blended can be used.
  • the resin composition used for this mixed solution the same resin composition used for bonding the mica sheet and the support material can be used.
  • the compounding amount of the nanofiller 2 needs to be appropriately set according to the type of the thermosetting resin and the curing agent to be used, but generally 20 parts by mass to 100 parts by mass of the thermosetting resin. 200 parts by mass.
  • the mixed liquid containing the nanofiller 2 and the water-soluble polymer 4 is not particularly limited, and for example, a solution obtained by dissolving the nanofiller 2 and the water-soluble polymer 4 with a solvent can be used. It does not specifically limit as a solvent, A well-known thing can be used in the said technical field. Specific examples of the solvent include water, ethanol, ethylene glycol and the like. These may be used alone or in combination of two or more. The blending amount of the solvent may be appropriately adjusted according to the coating property of the mixed solution, and is not particularly limited.
  • a mixed solution containing the nanofiller 2 and the water-soluble polymer 4 is applied to the mica layer 5 with the reinforcing layer 7 (S6).
  • the method for applying the mixed liquid containing the nanofiller 2 and the water-soluble polymer 4 is not particularly limited, and a method known in the technical field can be used. Examples of the coating method include a spray method and a roll coater method. After the mixture liquid containing the nanofiller 2 and the water-soluble polymer 4 is applied to the mica layer 5, the solvent is volatilized by heating to a predetermined temperature (S7). The insulating tape 1 in which 2 is unevenly distributed and these are supported by the water-soluble polymer 4 can be formed.
  • the nanosilica settles on one side of the mica particles due to its own weight and becomes unevenly distributed. Since the nanofiller coating liquid contains a water-soluble polymer and a volatile solvent, it is easy to obtain an unevenly distributed state. Finally, the completed insulating tape 1 is wound up and the series of steps is completed.
  • Embodiment 2 In the stator coil according to the second embodiment of the present invention, the coil conductor and the insulating tape 1 according to the first embodiment wound around the outer periphery of the coil conductor are impregnated with the liquid thermosetting resin composition and heated. And an insulating layer integrated with the coil conductor by being cured by pressurization.
  • the stator coil of the present embodiment is characterized by the insulating tape to be used, and a conventionally known configuration (for example, the configuration shown in FIG. 3) can be adopted as the other configuration. As shown in FIG.
  • stator coil 10 having the coil conductor 8 and the insulating layer 9 is vertically moved in a plurality of slots 12 formed on the inner peripheral side of the stator core 11.
  • a spacer 13 is inserted between the stator coils 10, and a wedge 14 for fixing the stator coil 10 is inserted into the opening end of the slot 12.
  • the stator coil 10 having such a structure is manufactured as follows. First, a plurality of insulating tapes 1 (for example, a half of the width of the insulating tape 1) overlap each other on the outer periphery of the coil conductor 8 formed by bundling a plurality of insulated wire conductors. Wind around.
  • the wire constituting the coil conductor 8 is not particularly limited as long as it is conductive, and a wire made of copper, aluminum, silver or the like can be used.
  • the liquid thermosetting resin composition is impregnated into the insulating tape 1 wound around the coil conductor 8.
  • the liquid thermosetting resin composition used for impregnation is not particularly limited, but generally includes a thermosetting resin and a curing agent. It does not specifically limit as a thermosetting resin, The same thing as what was illustrated in Embodiment 1 can be used.
  • the curing agent is not particularly limited, and those known in the technical field can be used.
  • curing agents include: cycloaliphatic acid anhydrides such as methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, hymic anhydride; aliphatic acid anhydrides such as dodecenyl succinic anhydride; phthalic anhydride, trihydric anhydride Aromatic acid anhydrides such as merit acid; organic dihydrazides such as dicyandiamide and adipic acid dihydrazide; tris (dimethylaminomethyl) phenol; dimethylbenzylamine; 1,8-diazabicyclo (5,4,0) undecene and derivatives thereof; And imidazoles such as -methylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, and the like.
  • curing agents may be used alone or in combination of two or more.
  • the amount of the curing agent needs to be appropriately set according to the type of the thermosetting resin and the curing agent to be used, but is generally 0.1 parts by mass with respect to 100 parts by mass of the thermosetting resin. ⁇ 200 parts by mass.
  • the method for impregnating the liquid thermosetting resin composition is not particularly limited, and methods known in the technical field can be used.
  • Examples of the impregnation method include vacuum impregnation, vacuum pressure impregnation, and normal pressure impregnation.
  • the conditions for the impregnation are not particularly limited, and may be appropriately adjusted according to the type of the liquid thermosetting resin composition to be used.
  • the coil conductor 8 is clamped from the outside of the insulating tape 1 to apply pressure to the insulating tape 1.
  • the liquid thermosetting resin composition impregnated in the insulating tape 1 is cured to obtain the insulating layer 9. Thereby, the stator coil 10 is obtained.
  • the stator coil 10 of the present embodiment manufactured as described above uses the insulating tape 1 of the first embodiment, the aggregation of the nanofiller 2 during varnish impregnation can be suppressed.
  • the nanofiller 2 is carried on the insulating tape 1 by the water-soluble polymer 4 insoluble in the varnish, and does not mix with the varnish when impregnated with the varnish. Therefore, the nano filler 2 can be added at a high concentration without affecting the varnish viscosity. By these, the withstand voltage improvement effect is obtained. Further, since the nano filler 2 is unevenly distributed, a space having a high particle concentration can be formed in a state in which the nano filler 2 is dispersed in the vicinity of the surface of the mica particle 3. Can be suppressed.
  • Example 1 The insulating tape is manufactured by the above-described method, and hydrophilic nano silica is applied at a tape weight of 10 g / m 2 , and hydroxyethyl cellulose (weight of 1 g / m 2 ) is used as the water-soluble polymer.
  • coil insulation is obtained by winding each insulation tape around a conductor 15 times in half-lap, vacuum impregnating a resin mixture made of bisphenol A type epoxy resin and acid anhydride, and heating and curing at 150 ° C. for 12 hours to obtain a coil. It was.
  • Example 1 A coil insulator was formed around the coil conductor using an insulating tape containing no nanofiller. The other tape material and coil material configurations were the same as in Example 1.
  • FIG. 5 is a graph relatively showing the dielectric breakdown voltages of the coils of the above-described examples and comparative examples according to the second embodiment. Error bars in the figure indicate data variation ranges in a plurality of measurements.
  • the insulating layer of Example 1 was confirmed to have an effect of improving characteristics by about 30% as compared with Comparative Example 1.
  • the comparative example 2 and the comparative example 3 use the insulating tape which added the nano filler, the breakdown voltage improvement effect of Example 1 was not expressed. It is estimated that this is because the filler flows together with the resin for impregnation and the amount contained in the insulator system is reduced, or the aggregation of the nanofiller has progressed.
  • FIG. 6A is a cross-sectional view orthogonal to the rotation axis J of the rotating electrical machine of the present invention
  • FIG. 6B is a cross-sectional view showing a cross section along the rotation axis J of the rotating electrical machine of the present invention.
  • FIG. 6A corresponds to a cut surface taken along line 1a-1a in FIG. 6B.
  • FIG. 6B corresponds to a cut surface taken along line 1a-1a in FIG. 6B.
  • the stator of the rotating electrical machine 100 includes a cylindrical stator core 101 that houses a rotor K (not shown), an iron core fastening member 102, a holding ring 103, a frame 104, an intermediate frame member 105, and an elastic support member. 106 and the like.
  • the iron core fastening members 102 are provided on the outer peripheral portion of the stator iron core 101 at predetermined intervals in the circumferential direction, and are used to fasten the stator iron core 101 in the axial direction. In this example, eight iron core fastening members 102 are used.
  • the retaining ring 103 is provided on the outer peripheral portion of the stator core 101 at a predetermined interval in the axial direction, and is a flat ring in the axial direction that holds the stator core so as to be tightened from the top of the core tightening member 102 toward the central portion. In this example, it is used at four locations.
  • the frame 104 is a cylindrical container that surrounds the stator core 101 around the stator core 101 and is spaced from the stator core 101.
  • the middle frame member 105 is a ring-shaped member that protrudes from the inner surface of the frame 104 in the axial direction at a predetermined interval in the axial direction, and is used at five locations in this example.
  • the elastic support member 106 is a spring plate fixed to the holding ring 103 at an adjacent middle frame member 105 and an axially central portion. In this example, the elastic support member 106 includes four elastic support members 106.
  • the stator shown in FIG. 6 constitutes, for example, an armature of a turbine generator, and a predetermined number of slots formed in the axial direction are provided in the inner peripheral portion of the stator core 101 in the circumferential direction. A stator coil is disposed in the slot.
  • FIG. 7 is a partial sectional view showing the stator coil inside the slot of the rotating electrical machine according to the third embodiment.
  • the slot 112 is a groove into which the stator coil 120 is inserted in a shape extending in the stacking direction of the iron core 111, that is, in the direction of the rotation axis J.
  • the iron core 111 is a stator iron core in which silicon steel plates are laminated.
  • the stator coil 120 is a coil conductor 108 and a ground insulating layer 109 that can be impregnated made of the above-described insulating material according to the present invention. 108 is wound around the outside.
  • a semiconductive surface corona prevention layer 115 is formed on the outer periphery of the ground insulating layer 109.
  • the coil near the insertion port side to the slot 112 is the upper opening coil 116
  • the coil far from the slot insertion port side is the lower opening coil 117.
  • a wedge 114 is provided at the insertion opening.
  • an insulating spacer 123 whose surface has been subjected to a mold release process is provided on the inner surface of the slot 112, and the inner surface of the insulating spacer 123 is separated.
  • the stator coil 120 is disposed on the mold surface 122.
  • a stator coil 120 as shown in FIG. 7 is annularly installed to form a cylindrical shape, and the rotor K is disposed at the center.
  • the longitudinal direction of the cylindrical shape coincides with the stacking direction of the stator core 111 and the extending direction of the rotation axis J, and the upper coil 116 and the lower coil 117 are inserted into each of a plurality of slots 112 provided in an annular shape. ing. And the upper opening coil 116 and the lower opening coil 117 inserted in this slot 112 and the coil inserted in each of the other slots must be electrically connected.
  • Rotating electrical machines such as turbine generators are required to have higher output and smaller size. In order to achieve high output and miniaturization, it is essential to improve the insulation performance of the coil insulator.
  • FIG. 8 is a diagram showing an example of the shape of the coil conductor 108 used for the stator coil of the rotating electrical machine.
  • the normal coil conductor 108 has coil end portions 118 that are not inserted into the slots at both ends of a rectangular columnar straight portion that is inserted into the slot 112 and has a rectangular cross section, and the coil end portion 118 has a curved shape. have.
  • the insulating tape 1 of the present invention When the insulating tape 1 of the present invention is used, the insulating tape 1 is wound by the buffering action of the water-soluble polymer 4 and is deformed following the coil end portion 118. It becomes low. In fact, after the rotating electrical machine such as a generator was completed, the insulation performance was confirmed by measuring the coil insulation characteristics, and by using the insulation tape 1 of the present invention, the insulation performance of the product was stabilized for each production. I was able to confirm that.
  • stator coil 11 stator core, 12 Slot, 13 spacer, 14 wedge, 100 rotating electrical machine, 101 stator iron core, 102 iron core fastening member, 103 retaining ring, 104 frame, 105 middle frame member, 106 elastic support member, 108 coil conductor, 109 ground insulation layer, 111 Iron core, 112 slots, 114 wedges, 115 surface corona prevention layer, 116 upper opening coil, 117 lower opening coil, 120 stator coil, 122 release surface, 123 spacer

Abstract

L'invention concerne une bande isolante (1) utilisée pour l'isolation de bobine d'une machine électrique rotative, la bande isolante (1) étant caractérisée en ce qu'elle comporte : une couche de mica (5) contenant des particules de mica (3), un polymère soluble dans l'eau (4), et une nanocharge (2) répartie de manière disproportionnée sur la surface sur un côté des particules de mica (3) ; et une couche de renfort (7) stratifiée sur la couche de mica (5), la couche de renfort (7) contenant un renfort de fibre (6). En outre, l'invention concerne un procédé de fabrication d'une bande isolante (1) caractérisé en ce qu'il comprend une étape de formation d'un liquide de dispersion contenant les particules de mica (3) dans une feuille et de formation d'une couche de mica (5), et une étape de fixation de la couche de mica (5) à une couche de renfort (7) contenant un renfort de fibre (6) puis d'application d'un mélange liquide contenant une nanocharge (2) et un polymère soluble dans l'eau (4) sur la couche de mica (5).
PCT/JP2015/084470 2014-12-22 2015-12-09 Bande isolante et son procédé de fabrication, bobine de stator et son procédé de fabrication, et générateur WO2016104141A1 (fr)

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JPWO2018002974A1 (ja) * 2016-07-01 2019-04-18 東芝三菱電機産業システム株式会社 コロナ放電防止構造製造方法、コロナ放電防止構造および回転電機
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