WO2015114907A1 - 絶縁テープ及びその製造方法、固定子コイル及びその製造方法、並びに回転電機 - Google Patents
絶縁テープ及びその製造方法、固定子コイル及びその製造方法、並びに回転電機 Download PDFInfo
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- WO2015114907A1 WO2015114907A1 PCT/JP2014/080080 JP2014080080W WO2015114907A1 WO 2015114907 A1 WO2015114907 A1 WO 2015114907A1 JP 2014080080 W JP2014080080 W JP 2014080080W WO 2015114907 A1 WO2015114907 A1 WO 2015114907A1
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- layer
- insulating tape
- mica
- filler
- cellulose derivative
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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
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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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
- H01B3/185—Substances or derivates of cellulose
-
- 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
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/32—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes natural resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/06—Insulation of windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2401/00—Presence of cellulose
- C09J2401/006—Presence of cellulose in the substrate
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, a manufacturing method thereof, and a rotating electrical machine.
- 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 is composed of a coil conductor and a stator coil insulator that covers the coil conductor.
- the stator coil is wound around the coil conductor several times with an insulating tape made of a mica sheet and fiber reinforcing material such as glass cloth, and impregnated with a low-viscosity liquid thermosetting resin composition (insulating varnish) under reduced pressure. Then, it is manufactured by heating while press forming so as to have a predetermined cross-sectional shape.
- the stator coils are housed in two stages in the upper and lower stages in the slot, and a spacer is inserted between the stator coils and a wedge for fixing the stator coil is inserted into the opening end of the slot. This suppresses electromagnetic vibration generated from the stator coil during operation of the rotating electrical machine.
- the coil conductor Normally, in such a stator of a rotating electrical machine, the coil conductor generates heat due to a load current during operation of the rotating electrical machine, so that heat is transferred to the surrounding gas via the stator coil insulator and the stator core. Dissipates heat.
- the thermal conductivity of the stator coil insulator is very small compared to the coil conductor and the stator core, so increasing the thermal conductivity of the stator coil insulator will greatly improve the cooling performance. effective. Therefore, it is important to increase the thermal conductivity of the stator coil insulator in order to increase the output and size of the rotating electrical machine.
- the hydrogen indirect cooling type rotating electric machine which is expected to be superior in terms of efficiency and operation / maintenance compared to the direct water cooling type rotating electric machine, it is strongly required to increase the thermal conductivity of the stator coil insulator. Has been.
- an adhesive is used to support the filler on the insulating tape.
- the insulating tape is wound around the coil conductor, and then impregnated with an insulating varnish and heat-cured to be integrated with the coil conductor. Therefore, an adhesive for supporting the filler
- the insulating varnish used for impregnation is required to have good compatibility and to be integrated with the adhesive and the insulating varnish at the time of heat curing.
- stator coil when manufacturing a stator coil using a conventional insulating tape, the filler flows out from the gap between the insulating tape and the insulating varnish to the outside in the longitudinal direction of the coil conductor when heating while pressing. Therefore, there is a problem that the obtained stator coil insulator cannot exhibit desired thermal conductivity. Further, when the stator coil is manufactured using the conventional insulating tape, there is a problem that the adhesive strength between the insulating tapes becomes insufficient.
- the present invention has been made in order to solve the above-described problem, and the stator coil insulation having high thermal conductivity without causing the filler previously supported on the insulating tape to flow outside when the stator coil is manufactured.
- An object of the present invention is to provide an insulating tape capable of forming a layer and improving the adhesive strength between the insulating tapes and a method for producing the same.
- Another object of the present invention is to provide a stator coil having high thermal conductivity and high strength reliability, and a method for manufacturing the same.
- the present invention includes a mica layer containing mica, a reinforcing layer laminated on the mica layer and containing a filler and a fiber reinforcing material, and a cellulose derivative layer laminated on the reinforcing layer, and the cellulose derivative layer Is one or more of the hydroxyl groups of the glucose unit, —CH 2 CH 2 OH, —CH 2 CH 2 OCH 2 CH 2 OH, —CH 2 CH (OH) CH 3 , —CH 3 , —CH 2 CH 3 , -NO 2, - (CH 2 CH 2 O) p H ( wherein, p is 0 super 50 any number of repetitions of the following), - CH 2 COOH, -CH 2 CH 2 COOH, -CH 2 COOM ( Wherein M is Li, Na or K) and — (CH 2 CH 2 O) q CH 2 CH (OH) CH 2 N + (CH 3 ) 2 (nC 12 H 25 ) X ⁇ (formula among, q is an arbitrary number of repetition
- the present invention also includes a step of forming a mica layer by making a dispersion containing mica, and a slurry containing a filler having a maximum particle size of 100 ⁇ m or less after bonding a fiber reinforcing material to the mica layer.
- a step of forming a reinforcing layer by applying to a fiber reinforcing material, and one or more of hydroxyl groups of glucose units are —CH 2 CH 2 OH, —CH 2 CH 2 OCH 2 CH 2 OH, —CH 2 CH (OH) CH 3 , —CH 3 , —CH 2 CH 3 , —NO 2 , — (CH 2 CH 2 O) p H (wherein p is an arbitrary number of repetitions greater than 0 and less than or equal to 50), —CH 2 COOH , —CH 2 CH 2 COOH, —CH 2 COOM (wherein M is Li, Na or K) and — (CH 2 CH 2 O) q CH 2 CH (OH) CH 2 N + (CH 3 ) 2 (n—C 12 H 25 ) X ⁇ (wherein q is an arbitrary number of repetitions of 0 to 50) Yes, X - is Cl -, Br -, F - or I - a is) a slurry
- the present invention also includes a coil conductor and an insulating layer formed by winding the insulating tape around the coil conductor and impregnating the insulating tape with a liquid thermosetting resin composition, followed by heating and pressing. Is a stator coil.
- the present invention also includes a step of winding the above-described insulating tape around a coil conductor, and a step of impregnating the insulating tape with a liquid thermosetting resin composition and heat-pressing the stator coil. It is a manufacturing method.
- the stator coil insulating layer having high thermal conductivity can be formed without causing the filler previously carried on the insulating tape to flow outside when the stator coil is manufactured, and the insulating tape It is possible to provide an insulating tape capable of improving the adhesive strength between the two and a method for manufacturing the same.
- FIG. 1 It is a schematic cross section of the insulating tape by Embodiment 1 of this invention. It is a figure for demonstrating the state at the time of impregnating a liquid thermosetting resin composition in the insulating tape by Embodiment 1 of this invention, and heat-pressing-molding. It is a figure for demonstrating the state at the time of impregnating a liquid thermosetting resin composition in the insulating tape in which the cellulose derivative layer is not formed, and heat-press-molding. It is a partial expansion perspective view of the stator of a rotary electric machine. It is a cross-sectional perspective view of the generator as an example 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 layer 3 containing mica 2, a reinforcement layer 6 laminated on the mica layer 3, a filler 4 and a fiber reinforcing material 5, and a cellulose derivative laminated on the reinforcement layer 6. And a layer 7.
- Mica layer 3 includes mica 2.
- the mica 2 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 2 include block mica, peeled mica, and assembled mica. These may be used alone or in combination of two or more. Among these, it is preferable to use a laminated mica because the thickness is uniform and the cost is low.
- the mica layer 3 can contain a resin such as an epoxy resin, a silicone resin, and a phenol resin in addition to the mica 2. These resins can bond the mica 2 to each other and improve the strength of the mica layer 3. Further, these resins are preferably bonded and integrated with the insulating varnish when the stator coil is manufactured. Therefore, it is desirable to select the type as appropriate according to the reactivity with the insulating varnish.
- a resin such as an epoxy resin, a silicone resin, and a phenol resin in addition to the mica 2.
- the basis weight of the mica 2 is 100 g or more and 200 g or less, preferably 140 g or more and 180 g or less, per 1 m 2 of insulating tape. If the basis weight of the mica 2 is less than 100 g / m 2 , desired electrical insulation cannot be obtained, and the dielectric breakdown time at the time of degradation of electric power is shortened. On the other hand, when the basis weight of the mica 2 exceeds 200 g / m 2 , although the electric insulation is good, the insulating tape 1 becomes thick and difficult to wind. In addition, when the thickness of the insulating layer is constant, the filler filling rate effective for increasing the thermal conductivity of the insulating tape 1 is relatively lowered, and an insulating layer having a high thermal conductivity cannot be formed. is there.
- the thickness of the mica layer 3 may be appropriately set according to the size of the insulating tape 1 and the like, but is preferably 40 ⁇ m or more and 180 ⁇ m or less, more preferably 60 ⁇ m or more and 140 ⁇ m or less.
- Examples of the filler 4 include alumina, magnesium oxide, zinc oxide, magnesium carbonate, graphite, carbon tube, boron nitride, titanium boride, silicon carbide, silicon nitride, silica, and aluminum nitride. These may be used alone or in combination of two or more. Further, fillers having different particle diameters may be combined to increase the packing density. Among these, boron nitride is preferable in that the insulating layer can have high thermal conductivity with a particularly small basis weight, and electrical insulation can be maintained.
- the primary particles of boron nitride have a layered structure similar to that of graphite, and the particle shape is scaly and has a high thermal conductivity in the major axis direction and a low thermal conductivity in the minor axis direction. It has a typical thermal conductivity. Therefore, when the primary particles of boron nitride are used as the filler 4, depending on the manufacturing conditions of the insulating tape 1, the thermal conductivity of the insulating layer may vary due to the anisotropic thermal conductivity of the boron nitride. is there.
- secondary aggregated particles obtained by aggregating the primary particles of boron nitride are used as the filler 4. It is preferable.
- the intensity ratio (I ⁇ 002> / I ⁇ 100>) of the X-ray diffraction peak of the ⁇ 002> plane to the ⁇ 100> plane of the secondary aggregated particles is It is preferable that it is 15 or less.
- a method for producing secondary agglomerated particles of boron nitride a method known in the art can be used. For example, it can be produced by agglomerating primary particles of boron nitride with an inorganic binder.
- the inorganic binder include boric acid, alkali metal or alkaline earth metal borate (calcium borate, magnesium borate, sodium borate, potassium borate), sodium silicate, aluminum phosphate, and the like. .
- the maximum particle size of the filler 4 is 100 ⁇ m or less, preferably 80 ⁇ m or less. When the maximum particle size of the filler 4 exceeds 100 ⁇ m, it is necessary to relatively reduce the basis weight of the mica 2 that bears the insulating property so that the thickness of the insulating tape 1 does not increase.
- the maximum particle size of the filler 4 is the cross-sectional size of all the fillers 4 included in an image (photographing area 200 ⁇ m ⁇ 200 ⁇ m or more) obtained by photographing the tape cross section using SEM or the like (magnification 300 times). This is performed until the number of fillers 4 reaches 1000, which means the maximum value of 1000 fillers 4 measured.
- the maximum value is set to 100 ⁇ m, it is included in this range as long as the effect described in the embodiment is obtained as long as it is within the error range.
- the weight per unit area of the filler 4 is 10 g or more and 50 g or less, and 10 g or more and 30 g or less per 1 m 2 of the insulating tape, in consideration of the thickness of the insulating tape 1 and the insulating properties based on the basis weight of the mica 2. Is preferred. If the basis weight of the filler 4 is less than 10 g, the desired thermal conductivity cannot be obtained. On the other hand, when the basis weight of the filler 4 exceeds 50 g, it is necessary to relatively reduce the basis weight of the mica 2 that bears the insulating property so that the thickness of the insulating tape 1 does not increase, so that the electrical insulation characteristics are deteriorated. .
- the fiber reinforcing material 5 examples include glass cloth, alumina cloth, silica cloth, and the like. If there is an opening in the fiber reinforcing material 5, it is possible to suppress an increase in the thickness of the insulating tape 1 due to the addition of the filler 4 by filling the filler 4 therein, and to increase the thermal conductivity of the insulating layer. Can contribute.
- the thickness of the fiber reinforcement 5 is preferably 100 ⁇ m or less from the viewpoint of electrical insulation characteristics.
- the basis weight of the fiber reinforcing material 5 is preferably 10 g or more and 50 g or less, more preferably 10 g or more and 30 g or less per 1 m 2 of insulating tape 1.
- one or more of the hydroxyl groups of the glucose unit are made of —CH 2 CH 2 OH, —CH 2 CH 2 OCH. 2 CH 2 OH, —CH 2 CH (OH) CH 3 , —CH 3 , —CH 2 CH 3 , —NO 2 , — (CH 2 CH 2 O) p H (wherein p is greater than 0 and less than or equal to 50 Any number of repetitions), —CH 2 COOH, —CH 2 CH 2 COOH, —CH 2 COOM (wherein M is Li, Na or K) and — (CH 2 CH 2 O) q CH 2 CH (OH) CH 2 N + (CH 3 ) 2 (n—C 12 H 25 ) X ⁇ (wherein q is an arbitrary number of repetitions of 0 to 50, and X ⁇ is Cl ⁇ , Br ⁇ , F - or I - a is)
- the cellulose derivative which is.
- Specific examples of the cellulose derivative substituted with such a functional group include hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, ethyl cellulose, nitrocellulose, carboxymethyl cellulose, carboxyethyl cellulose, and cationized cellulose.
- one or more of the hydroxyl groups of the glucose unit is replaced with —CH 2 CH 2 OH and — (CH 2 CH 2 ) in terms of electrical insulation characteristics and workability in the process of forming the cellulose derivative layer 7 during the production of the insulating tape.
- glucose derivatives substituted with a functional group selected from the group consisting of ultra-50 is any number of repetitions of the following
- 2 or 1 or more hydroxyl groups in a glucose unit The following was substituted with a functional group selected from the group consisting of —CH 2 CH 2 OH and — (CH 2 CH 2 O) p H (wherein p is an arbitrary number of repetitions of 2 to 50). It is most preferable to include a glucose derivative (that is, the degree of substitution with these functional groups is 1 or more and 2 or less).
- n in the following chemical formula is preferably a value such that the molecular weight of the cellulose derivative is 10,000 or more, and a value that is 100,000 or more and 3000000 or less from the viewpoint of stably exhibiting the filler outflow prevention effect. More preferably.
- the cellulose derivative layer 7 may contain a water-soluble polymer other than the cellulose derivative as long as the effects of the present invention are not impaired.
- the cellulose derivative layer 7 is formed so as to cover the filler 4 included in the reinforcing layer 6 as shown in FIG. 2, there are few outflow paths of the filler 4 included in the reinforcing layer 6 (the arrows in the figure are (Representing the outflow path of the filler 4), the insulating varnish is pushed out and moved out of the system when the stator coil is manufactured (especially when hot-press molding), but the filler 4 is blocked by the cellulose derivative layer 7. As a result, the filler 4 remains in the system, and an insulating layer having a desired thermal conductivity is obtained. Therefore, it is important that the cellulose derivative forming the cellulose derivative layer 7 is difficult to dissolve in the insulating varnish or not dissolved in the insulating varnish.
- the reinforcing layer 6 and the cellulose derivative layer 7 may be mixed on the mica layer 3.
- an epoxy resin, a silicone resin, a phenol resin, a vinyl ester resin, or the like is used as the insulating varnish, and the above-described cellulose derivatives have high solubility resistance to these resins.
- the above-mentioned cellulose derivative can not only suppress the outflow of filler during press molding, but also makes it difficult to cause separation between the insulating varnish and the surface of the filler 4 in the stator coil after heat and pressure molding, thereby insulating the cellulose derivative.
- the adhesive strength between the tapes 1 can be improved.
- the cellulose derivative layer 7 is not formed, there are many outflow paths of the filler 4 contained in the reinforcing layer 6 as shown in FIG. 3 (the arrow in the figure represents the outflow path of the filler 4).
- the stator coil is manufactured (particularly, when heat and pressure molding is performed), the filler 4 flows out together with the insulating varnish, and an insulating layer having a desired thermal conductivity cannot be formed.
- the basis weight of the cellulose derivative layer 7 is preferably 0.001 g or more and 5 g or less, more preferably 0.005 g or more and 1 g or less, per 1 m 2 of insulating tape.
- the basis weight of the cellulose derivative layer 7 is less than 0.001 g, the filler outflow prevention effect may not be exhibited.
- the basis weight of the cellulose derivative layer 7 exceeds 5 g, the effect of preventing the filler from flowing out increases, but the compatibility with the insulating varnish decreases and the insulating varnish becomes difficult to impregnate. As a result, voids are formed in the insulating layer. There is a concern to generate.
- a mica layer 3 is formed by making a dispersion containing mica 2. It does not specifically limit as a preparation method of the dispersion liquid containing the mica 2, A well-known method in the said technical field can be used.
- a dispersion can be prepared by dispersing mica 2 in water.
- the content of mica 2 in the dispersion is not particularly limited, and may be appropriately adjusted depending on the type of mica 2 and the like.
- the method for making the dispersion is not particularly limited, and methods known in the art 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 as other support materials.
- 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 adhesion between 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.
- curing agent includes organometallic complexes or organometallic salts of metals such as cobalt, copper, zinc, iron, nickel, manganese, and tin.
- 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. The amount is 200 parts by mass or less.
- the solvent includes organic solvents such as toluene and methyl ethyl ketone. These may be used alone or in combination of two or more. What is necessary is just to adjust suitably the compounding quantity of a solvent according to the viscosity which the resin composition makes desired, and it does not specifically limit.
- the slurry containing the filler 4 is applied to the fiber reinforcing material 5 to form the reinforcing layer 6.
- the method for attaching the fiber reinforcing material 5 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 5 may be bonded together using a resin composition.
- the resin composition is applied to the fiber reinforcing material 5 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. .
- what is necessary is just to press-fit and press-bond this laminated body with a hot roll etc. under the heating of 60 degreeC or more and 70 degrees C or less.
- the slurry containing the filler 4 is not particularly limited, and for example, a resin composition containing the filler 4 can be used.
- a resin composition containing the filler 4 can be used as the resin composition used for this slurry.
- the same resin composition as that used for bonding the mica sheet and the support material can be used.
- the blending amount of the filler 4 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 or more and 200 parts by mass with respect to 100 parts by mass of the thermosetting resin. It is below mass parts.
- the method for applying the slurry containing the filler 4 is not particularly limited, and methods known in the technical field can be used. Examples of the application method include a spray method, a roll coater method, and a gravure transfer method.
- a cellulose derivative layer 7 is formed by applying a slurry containing a cellulose derivative to the reinforcing layer 6. It does not specifically limit as a slurry containing a cellulose derivative, For example, what melt
- the cellulose derivative layer 7 can be formed by heating to a predetermined temperature to volatilize the solvent.
- the filler 4 contained in the reinforcing layer 6 is covered with the cellulose derivative layer 7, the filler 4 previously supported on the reinforcing layer 6 is used to manufacture the stator coil.
- an insulating layer having a high thermal conductivity can be formed, and the adhesive strength between the insulating tapes 1 can be improved.
- 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 pressed. And an insulating layer that is cured and integrated with the coil conductor.
- 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. 4) can be adopted as the other configuration. As shown in FIG.
- a stator coil 10 having a coil conductor 8 and an 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 insulating tape 1 wound around the coil conductor 8 is impregnated with the liquid thermosetting resin composition.
- the liquid thermosetting resin composition used for impregnation is not particularly limited, but generally includes a thermosetting resin and a curing agent.
- the thermosetting resin the same ones as exemplified in the first embodiment can be used, but it is preferable to use those which are difficult to dissolve the above cellulose derivative or those which do not dissolve the above cellulose derivative. .
- 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.
- cycloaliphatic acid anhydrides such as methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, hymic an
- 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. The amount is 200 parts by mass or less.
- 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 by heating the insulating tape 1 or the like. Thereby, the stator coil 10 is obtained.
- the filler 4 previously supported is unlikely to flow out to the outside when the stator coil 10 is manufactured (especially when heat-pressing). Therefore, the thermal conductivity of the insulating layer can be improved and the adhesive strength between the insulating tapes 1 is high, so that the strength reliability can be improved.
- FIG. 5 shows a cross-sectional perspective view of the structure of a generator as an example of a rotating electrical machine.
- the generator is mainly composed of a stator 15 and a rotor 17.
- the stator 15 includes a stator core 11 and a stator coil 10 accommodated in a slot of the stator core 11.
- the rotor 17 includes a rotor iron core and a rotor coil 16 inserted into the rotor iron core.
- the stator coil 11 described in the second embodiment is used.
- the filler 4 previously carried on the insulating tape 1 is difficult to flow out to the outside when the stator coil 10 is manufactured (particularly, when heating and pressing), so the heat of the insulating layer
- the adhesive strength between the insulating tapes 1 is high, so that the strength reliability can be improved. Therefore, according to the present embodiment, the temperature of the stator coil insulator during operation can be reduced as compared with the conventional generator, and the life of the stator coil insulator can be extended.
- a highly reliable generator can be provided.
- the present embodiment is useful for an indirect hydrogen cooling type rotating electrical machine that requires a particularly high thermal conductivity.
- Example 1 The assembled mica powder was dispersed in water to prepare a dispersion of the assembled mica powder, and the dispersion was made with a paper machine to obtain a mica sheet. Next, a resin composition in which 100 parts by mass of bisphenol A type epoxy resin (trade name: JER (registered trademark) 828, manufactured by Mitsubishi Chemical Corporation) and 10 parts by mass of zinc naphthenate are dissolved in 400 parts by mass of methyl ethyl ketone is rolled. It was applied to a mica sheet by a coater method, and a glass cloth as a fiber reinforcing material was bonded thereon.
- JER registered trademark 828
- boron nitride powder slurry 150 parts by mass of a bisphenol A type epoxy resin (trade name: JER (registered trademark) 828, manufactured by Mitsubishi Chemical Corporation), 15 parts by mass of zinc naphthenate, boron nitride powder having a maximum particle size of 5 ⁇ m, and methyl ethyl ketone 1000 Part by mass was mixed to prepare a boron nitride powder slurry. This slurry was applied to the glass cloth surface of the bonded body of the mica sheet and the glass cloth by a roll coater method and dried to form a reinforcing layer containing boron nitride powder (the basis weight of boron nitride powder was 20 g / m 2 ).
- a slurry in which hydroxyethyl cellolose A (molecular weight: about 300,000, degree of substitution with —CH 2 CH 2 OH: 1) was dissolved in water was applied to the surface of the reinforcing layer by a spray method and dried at 80 ° C.
- a cellulose derivative layer was formed to obtain an insulating tape having a three-layer structure.
- 100 g of mica sheets are contained per 1 m 2 of the obtained insulating tape (weight per unit area 100 g / m 2 )
- boron nitride powder is contained 20 g (per unit weight 20 g / m 2 )
- glass cloth is 20 g.
- This insulating tape was cut into a width of 30 mm. Next, this insulating tape was wound 20 times on a coil conductor of 50 ⁇ 20 ⁇ 7000 mm by half-lap winding with the mica layer side facing the coil conductor. As the coil conductor, a plurality of flat insulated wires bundled and subjected to label dislocation were used.
- thermosetting resin composition comprising 90 parts by mass of an acid curing agent (trade name: HN-2200, manufactured by Hitachi Chemical Co., Ltd.) was impregnated. Press molding with a jig so that the thickness of the insulating tape impregnated with this liquid thermosetting resin composition is 4 mm, and heating in a drying furnace to cure the liquid thermosetting resin composition A stator coil was obtained.
- stator coils were produced in the same manner as in Example 1 using the materials shown in Tables 1 to 3, and evaluated.
- the molecular weight of carboxymethyl cellulose is about 150,000
- the degree of substitution with —CH 2 COOH is 2
- the molecular weight of methylcellulose is about 250,000
- the degree of substitution with —CH 3 is 1.
- Example 12 In place of hydroxyethyl cellolose A (molecular weight: about 300,000, degree of substitution with —CH 2 CH 2 OH: 1), substitution with hydroxyethyl cellulose B (molecular weight: about 230000, — (CH 2 CH 2 O) 2 H A stator coil was produced and evaluated in the same manner as in Example 1 except that the degree: 1) was used.
- Example 13 Instead of hydroxyethyl cellolose A (molecular weight: about 300,000, degree of substitution with —CH 2 CH 2 OH: 1), substitution with hydroxyethyl cellulose C (molecular weight: about 300,000, — (CH 2 CH 2 O) 6 H A stator coil was produced and evaluated in the same manner as in Example 1 except that the degree: 1) was used.
- Example 1 A stator coil was produced and evaluated in the same manner as in Example 1 except that the basis weight of the mica sheet was 90 g / m 2 .
- the measurement of thermal conductivity and a dielectric breakdown electric field was performed as follows.
- the thermal conductivity was measured using a steady method defined in JIS-A1412.
- the measurement of the dielectric breakdown electric field was carried out at an alternating current of 50 Hz by a short-time pressurization method (boost rate 2 kV / sec).
- the results are shown in Tables 1 to 3.
- the physical properties of the insulators shown in Tables 1 to 3 are relative values when the thermal conductivity and dielectric breakdown value of the stator coil obtained in Example 1 are 10.
- Examples 5, 6, 7, 8, and 9 and Comparative Examples 3, 4, and 5 are results of examining the maximum particle size and basis weight of boron nitride.
- the maximum particle size and basis weight of boron nitride were appropriate, both the thermal conductivity and the dielectric breakdown value were 10 or more.
- Comparative Example 3 since boron nitride having a maximum particle size of 110 ⁇ m was used, the insulating tape was thickened, and the proportion of the thickness of the mica layer in the insulating layer was reduced, so that the dielectric breakdown value was reduced.
- Comparative Example 5 the thermal conductivity was less than 10 because the basis weight of boron nitride was small.
- Examples 10 and 11 and Comparative Examples 6 and 7 are the results of examining the types and basis weights of cellulose derivatives. In Examples 10 and 11, since boron nitride is retained by the cellulose derivative, the thermal conductivity was 10 or more. On the other hand, in Comparative Example 6, boron nitride flowed out of the system, and the thermal conductivity was low. In Comparative Example 7, the thermal conductivity of the cellulose derivative was decreased. This is probably because the impregnation of the liquid thermosetting resin composition was inhibited by the cellulose derivative and voids were generated in the sample.
- Examples 12 and 13 hydroxyethyl cellulose having a different number of repeating p of — (CH 2 CH 2 O) p H was examined.
- the thermal conductivity was equivalent to that in Examples 1 to 4, and the relative value of the dielectric breakdown electric field showed particularly excellent characteristics.
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Abstract
Description
また、本発明は、熱伝導率が高く且つ強度信頼性の高い固定子コイル及びその製造方法を提供することを目的とする。
図1は、実施の形態1による絶縁テープの模式断面図である。
図1において、絶縁テープ1は、マイカ2を含むマイカ層3と、マイカ層3上に積層され、フィラー4及び繊維補強材5を含む補強層6と、補強層6上に積層されたセルロース誘導体層7とを有するものである。
これに対して、セルロース誘導体層7が形成されていない場合、図3に示すように、補強層6に含まれるフィラー4の流出経路が多く(図中の矢印はフィラー4の流出経路を表す)、固定子コイルを製造する際(特に、加熱加圧成形する際)に、絶縁ワニスと共にフィラー4が流出してしまい、所望の熱伝導性を有する絶縁層を形成することができない。
まず、マイカ2を含む分散液を抄造してマイカ層3を形成する。
マイカ2を含む分散液の調製方法としては、特に限定されず、当該技術分野において公知の方法を用いることができる。例えば、マイカ2を水中に分散させることによって分散液を調製することができる。分散液におけるマイカ2の含有量は、特に限定されず、マイカ2の種類等に応じて適宜調整すればよい。
分散液の抄造方法としては、特に限定されず、当該技術分野において公知の方法を用いることができる。例えば、市販の抄紙機を用いて分散液を抄造することにより、マイカ層3となるマイカシートを得ることができる。
熱硬化性樹脂としては、当該技術分野において公知のものを用いることができる。熱硬化性樹脂の具体例としては、エポキシ樹脂、不飽和ポリエステル樹脂、フェノール樹脂、メラミン樹脂、シリコーン樹脂、ポリイミド樹脂等が挙げられる。これらの中でも、エポキシ樹脂は、耐熱性、接着性等の特性に優れているので好ましい。エポキシ樹脂の例としては、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、オルソクレゾールノボラック型エポキシ樹脂、フェノールノボラック型エポキシ樹脂、脂環脂肪族エポキシ樹脂、グリシジル-アミノフェノール系エポキシ樹脂等が挙げられる。これらの樹脂は、単独で用いてもよいし、2種以上を組み合わせて用いてもよい。
硬化剤の配合量は、使用する熱硬化性樹脂や硬化剤の種類等に応じて適宜設定する必要があるが、100質量部の熱硬化性樹脂に対して、一般的に0.1質量部以上200質量部以下である。
溶剤の配合量は、樹脂組成物の所望とする粘度に応じて適宜調整すればよく、特に限定されない。
マイカシートに繊維補強材5を貼り合わせる方法としては、特に限定されず、当該技術分野において公知の方法を用いることができる。例えば、マイカシートと繊維補強材5とを樹脂組成物を用いて貼り合わせればよい。具体的には、ロールコーター法、スプレー法等の公知の方法を用いて樹脂組成物を繊維補強材5に塗布し、樹脂組成物中の溶剤を揮発させた後、その上にマイカシートを重ねる。その後、この積層物を60℃以上70℃以下の加熱下で熱ロール等により加圧して圧着させればよい。
セルロース誘導体を含むスラリーとしては、特に限定されず、例えば、上記したセルロース誘導体を溶剤で溶解させたものを用いることができる。
溶剤としては、特に限定されず、当該技術分野において公知のものを用いることができる。溶剤の具体例としては、水、エタノール、エチレングリコール等が挙げられる。これらは、単独で用いてもよいし、2種以上を組み合わせて用いてもよい。
溶剤の配合量は、スラリーの塗布性に応じて適宜調整すればよく、特に限定されない。
セルロース誘導体を含むスラリーの塗布後、所定の温度に加熱して溶剤を揮発させることにより、セルロース誘導体層7を形成することができる。
本発明の実施の形態2による固定子コイルは、コイル導体と、このコイル導体の外周部に巻き付けられた実施の形態1の絶縁テープ1に液状熱硬化性樹脂組成物を含浸して加熱加圧硬化させてコイル導体と一体化された絶縁層とを有する。本実施の形態の固定子コイルは、使用する絶縁テープに特徴があり、その他の構成は従来公知の構成(例えば、図4に示す構成)を採用することができる。図4に示すように、回転電機の固定子において、コイル導体8と絶縁層9とを有する固定子コイル10は、固定子鉄心11の内周側に形成された複数のスロット12内で上下2段に収納され、これらの固定子コイル10間にスペーサー13が挿入されると共に、スロット12の開口端部に固定子コイル10を固定するためのウェッジ14が挿入される。
まず、絶縁被覆された複数の素線導体を束ねて構成されたコイル導体8の外周部に、絶縁テープ1を一部(例えば、絶縁テープ1の幅の半分の部分)が互いに重なるように複数回巻き付ける。ここで、コイル導体8を構成する素線としては、導電性であれば特に限定されず、銅、アルミニウム、銀等からなる素線を用いることができる。
熱硬化性樹脂としては、実施の形態1において例示したものと同じものを用いることができるが、上記したセルロース誘導体を溶解し難いものか、又は上記したセルロース誘導体を溶解しないものを用いることが好ましい。
硬化剤の配合量は、使用する熱硬化性樹脂や硬化剤の種類等に応じて適宜設定する必要があるが、100質量部の熱硬化性樹脂に対して、一般的に0.1質量部以上200質量部以下である。
次に、絶縁テープ1を加熱等することにより、絶縁テープ1に含浸されている液状熱硬化性樹脂組成物を硬化させる。これにより、固定子コイル10が得られる。
回転電機の一例としての発電機の構造の断面斜視図を図5に示す。図5に示すように、発電機は、主に、固定子15及び回転子17で構成されている。固定子15は、固定子鉄心11と、固定子鉄心11のスロット内に収納された固定子コイル10とから構成される。また、回転子17は、回転子鉄心と、回転子鉄心に挿入された回転子コイル16とから構成される。この発電機では、実施の形態2で説明した固定子コイル11が用いられている。
本実施の形態の発電機では、絶縁テープ1に予め担持させたフィラー4が固定子コイル10の製造の際(特に、加熱加圧成形する際)に外部に流出し難いので、絶縁層の熱伝導率を向上させることができる上に、絶縁テープ1間の接着強度が高いので、強度信頼性を向上させることができる。そのため、本実施の形態によれば、従来の発電機よりも、運転時の固定子コイル絶縁物の温度を低減することが可能であり、固定子コイル絶縁物を長寿命化することができる。また、本実施の形態によれば、絶縁テープ1間の剥離を抑えることができるので、信頼性の高い発電機を提供することができる。本実施の形態は、特に高い熱伝導率が要求される水素間接冷却方式の回転電機に有用である。
<実施例1>
集成マイカ粉を水中分散させ、集成マイカ粉の分散液を調製した後、この分散液を抄紙機にて抄造してマイカシートを得た。
次に、ビスフェノールA型エポキシ樹脂(商品名:JER(登録商標)828、三菱化学株式会社製)100質量部とナフテン酸亜鉛10質量部とをメチルエチルケトン400質量部に溶解した樹脂組成物を、ロールコーター法によりマイカシートに塗布し、その上に繊維補強材としてのガラスクロスを貼り合わせた。
次に、ビスフェノールA型エポキシ樹脂(商品名:JER(登録商標)828、三菱化学株式会社製)150質量部と、ナフテン酸亜鉛15質量部と、最大粒径5μmの窒化ホウ素粉末と、メチルエチルケトン1000質量部とを混合し、窒化ホウ素粉末のスラリーを調製した。このスラリーを、ロールコーター法により上記マイカシートとガラスクロスとの貼り合わせ体におけるガラスクロス面に塗布し、乾燥させ、窒化ホウ素粉末を含有する補強層を形成した(窒化ホウ素粉末の目付量20g/m2)。
続いて、ヒドロキシエチルセロルースA(分子量:約300000、-CH2CH2OHによる置換度:1)を水に溶解させたスラリーを、スプレー法により補強層の表面に塗布し、80℃で乾燥させ、セルロース誘導体層を形成し、3層構造の絶縁テープを得た。なお、得られた絶縁テープ1m2当たり、マイカシートは100g含有されており(目付量100g/m2)、窒化ホウ素粉末は20g含有されており(目付量20g/m2)、ガラスクロスは20g含有されており(目付量20g/m2)、ヒドロキシエチルセロルースAは1g含有されていた(目付量1g/m2)。この絶縁テープを幅30mmに切断した。
次に、この絶縁テープを、マイカ層面をコイル導体側にして、半重ね巻きで、50×20×7000mmのコイル導体に20回巻き付けた。コイル導体には複数の平角絶縁素線を束ねてレーベル転位させたものを用いた。次に、この絶縁テープを巻き付けたコイル導体に、真空加圧含浸方式によりビスフェノールA型エポキシ樹脂(商品名:JER(登録商標)828、三菱化学株式会社製)100質量部と、メチルテトラヒドロ無水フタル酸硬化剤(商品名:HN-2200、日立化成工業株式会社製)90質量部とからなる液状熱硬化性樹脂組成物を含浸させた。この液状熱硬化性樹脂組成物を含浸させた絶縁テープの厚さが4mmになるように治具を用いてプレス成形し、乾燥炉で加熱して、液状熱硬化性樹脂組成物を硬化させることにより固定子コイルを得た。
実施例2~11については表1~3に示す材料を用いて実施例1と同様に固定子コイルを作製し、評価を行った。なお、表中のカルボキシメチルセロルースの分子量は約150000であり、-CH2COOHによる置換度は2であり、メチルセルロースの分子量は、約250000であり、-CH3による置換度は1である。
ヒドロキシエチルセロルースA(分子量:約300000、-CH2CH2OHによる置換度:1)の代わりに、ヒドロキシエチルセロルースB(分子量:約230000、-(CH2CH2O)2Hによる置換度:1)を用いたこと以外は実施例1と同様の手法にて固定子コイルを作製し、評価を行った。
ヒドロキシエチルセロルースA(分子量:約300000、-CH2CH2OHによる置換度:1)の代わりに、ヒドロキシエチルセロルースC(分子量:約300000、-(CH2CH2O)6Hによる置換度:1)を用いたこと以外は実施例1と同様の手法にて固定子コイルを作製し、評価を行った。
マイカシートの目付量を90g/m2としたこと以外は実施例1と同様の手法にて固定子コイルを作製し、評価を行った。
比較例2~7については表1~3に示す材料を用いて実施例1と同様に固定子コイルを作製し、評価を行った。
熱伝導率の測定は、JIS-A1412に規定されている定常法を用いて測定した。また、絶縁破壊電界の測定は、交流50Hzにて、短時間昇圧法(昇圧速度2kV/秒)で行った。結果を表1~3に示す。なお、表1~3に示す絶縁物の物性は、実施例1で得られた固定子コイルの熱伝導率及び絶縁破壊値を10とした時の相対値である。
実施例10及び11、比較例6及び7は、セルロース誘導体の種類及び目付量を検討した結果である。実施例10及び11では、セルロース誘導体によって窒化ホウ素が保持されるため、熱伝導率は10以上となった。一方、比較例6では、窒化ホウ素が、系外へ流出し、熱伝導率は低くなった。また、比較例7では、セルロース誘導体が含まれるものの熱伝導率は低下した。これは、液状熱硬化性樹脂組成物の含浸がセルロース誘導体によって阻害され、試料内にボイドが生成したためと考えられる。
Claims (8)
- マイカを含むマイカ層と、
該マイカ層上に積層され、フィラー及び繊維補強材を含む補強層と、
該補強層上に積層されたセルロース誘導体層とを有し、
該セルロース誘導体層が、グルコース単位の水酸基の1個以上を、-CH2CH2OH、-CH2CH2OCH2CH2OH、-CH2CH(OH)CH3、-CH3、-CH2CH3、-NO2、-(CH2CH2O)pH(式中、pは0超50以下の任意の繰り返し数である)、-CH2COOH、-CH2CH2COOH、-CH2COOM(式中、MはLi、Na又はKである)及び-(CH2CH2O)qCH2CH(OH)CH2N+(CH3)2(n-C12H25)X-(式中、qは0以上50以下の任意の繰り返し数であり、X-はCl-、Br-、F-又はI-である)からなる群から選択される官能基で置換したグルコース誘導体を含み、
該マイカの目付量が100g/m2以上200g/m2以下の範囲であり、
該フィラーの最大粒径が100μm以下であり且つその目付量が10g/m2以上50g/m2以下の範囲であることを特徴とする絶縁テープ。 - 前記フィラーが、窒化ホウ素であることを特徴とする請求項1に記載の絶縁テープ。
- 前記セルロース誘導体層の目付量が、0.001g/m2以上5g/m2以下であることを特徴とする請求項1又は2に記載の絶縁テープ。
- 前記セルロース誘導体が、グルコース単位の水酸基の1個以上2個以下を、-CH2CH2OH及び-(CH2CH2O)pH(式中、pは2以上50以下の任意の繰り返し数である)からなる群から選択される官能基で置換したグルコース誘導体を含むことを特徴とする請求項1~3の何れか一項に記載の絶縁テープ。
- マイカを含む分散液を抄造してマイカ層を形成する工程と、
該マイカ層に繊維補強材を貼り合わせた後、最大粒径が100μm以下であるフィラーを含むスラリーを該繊維補強材に塗布して補強層を形成する工程と、
グルコース単位の水酸基の1個以上が、-CH2CH2OH、-CH2CH2OCH2CH2OH、-CH2CH(OH)CH3、-CH3、-CH2CH3、-NO2、-(CH2CH2O)pH(式中、pは0超50以下の任意の繰り返し数である)、-CH2COOH、-CH2CH2COOH、-CH2COOM(式中、MはLi、Na又はKである)及び-(CH2CH2O)qCH2CH(OH)CH2N+(CH3)2(n-C12H25)X-(式中、qは0以上50以下の任意の繰り返し数であり、X-はCl-、Br-、F-又はI-である)からなる群から選択される官能基で置換されたセルロース誘導体を含むスラリーを該補強層に塗布してセルロース誘導体層を形成する工程と
を含み、
該マイカの目付量を100g/m2以上200g/m2以下の範囲とし、
該フィラーの目付量を10g/m2以上50g/m2以下の範囲とすることを特徴とする絶縁テープの製造方法。 - コイル導体と、
該コイル導体に請求項1~4の何れか一項に記載の絶縁テープを巻き付け、該絶縁テープに液状熱硬化性樹脂を含浸して加熱加圧成形させた絶縁層と
を有することを特徴とする固定子コイル。 - コイル導体に請求項1~4の何れか一項に記載の絶縁テープを巻き付ける工程と、
該絶縁テープに液状熱硬化性樹脂を含浸して加熱加圧成形する工程と
を含むことを特徴とする固定子コイルの製造方法。 - 固定子鉄心のスロット内に、請求項6に記載の固定子コイルが収納されていることを特徴とする回転電機。
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