JP2016124878A - Thermosetting resin composition and rotary electric machine using the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosetting resin composition for a rotary electric machine having excellent insulation properties, and a rotary electric machine with the composition.SOLUTION: In a stator 20 of a rotary electric machine where a stator coil 60 is arranged around a slot 15 of a stator core 21, the stator coil comprises a plurality of segment conductors. Each segment conductor includes an insulating cover part covered with an insulation coating and a conductor exposing part where a conductor is exposed, and is connected to another segment conductor via the conductor exposing part, and the stator coil is covered with a thermosetting resin composition comprising a photopolymerization initiator, a thermal polymerization initiator, and an inorganic additive.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a thermosetting resin composition, a stator of a rotating electrical machine using the resin composition, or a rotating electrical machine including the same.

  In recent years, rotating electrical machines are required to have a small size and high output. As such a rotating electrical machine, for example, a large number of conductor segments having a square cross section are inserted into the slot, and then a pair of ends of each conductor segment are joined to form a stator winding, thereby reducing the space factor. What improved the output by improving the cooling performance is known.

  Then, in order to improve the insulation performance, the first resin member is thinly attached to the second coil end group in which a plurality of joint portions formed by joining the first coil end group in which the turn portion is formed and the tip portion are disposed. In addition, there is a vehicle alternator stator in which the second resin member is thickly attached only in the vicinity of the joint portion of the second coil end group (see, for example, Patent Document 1).

  There is also an electric device that defines the material of the second resin member used for the joint (see, for example, Patent Document 2).

JP 2004-048999 A JP 2012-090433 A

  In the technique of Patent Document 1, it is necessary to use two types of resin members, and the second resin member is thickly attached only in the vicinity of the joint portion of the second coil end group. In the insulation design, the thickness of the resin member at the coil end may be substantially uniform, and there is no necessity to increase the thickness only in the vicinity of the joint. By using two types of resin members, double production facilities are required for adhesion and curing of the resin members, and more material is required than the resin members required for dielectric strength by increasing the thickness of only the joints. There was a problem.

  The technology of Patent Document 2 is an alternative to the second resin member (powder epoxy varnish) used in Patent Document 1 and the like, and dust is prevented by using a liquid resin at the joint. . However, the above-mentioned problem remains because it is intended only for the joint portion and uses two types of resin members.

  Furthermore, in order to cope with the high voltage with these resin configurations, there is a problem that it is necessary to make it thicker than the conventional resin member.

  The stator coil of the rotating electrical machine according to the present invention is characterized by being coated with a thermosetting resin composition containing a photopolymerization initiator, a thermopolymerization initiator, and an inorganic additive.

  ADVANTAGE OF THE INVENTION According to this invention, the stator of the rotary electric machine excellent in insulation and the rotary electric machine provided with the same can be provided.

1 is a cross-sectional view illustrating an overall configuration of a rotating electrical machine 10 including a stator 20. 3 is a perspective view showing a configuration of a stator 20. FIG. It is a perspective view which shows the welding side coil end part of the stator coil before varnish application. It is a cross-sectional perspective view which shows the anti-welding side coil end part of the stator coil before varnish application. The top view of the welding side coil end part of a stator coil. The top view of the non-welding side coil end part of a stator coil.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a thermosetting resin has (A) a photopolymerization initiator, (B) a thermopolymerization initiator, and (C) an inorganic additive. It was found that a thermosetting resin composition containing Hereinafter, the thermosetting resin composition according to the present invention will be described in detail.
(Configuration of thermosetting resin composition)
(A) Photopolymerization initiator includes diphenylethanedione, benzyl derivatives such as di (4-methoxyphenyl) ethanedione, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, benzoin Benzoin derivatives such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzophenone, benzophenone derivatives such as 4,4′-bis (dimethylamino) benzophenone, 4,4′-dimethoxybenzophenone, 2-hydroxy-2- Propiophenone derivatives such as methylpropiophenone and 2-hydroxy-4 ′-(2-hydroxyethoxy) -2-methylpropiophenone, 2,2-diethoxyacetophenone, anthraquinone, 2-ethylanthraquinone, 1 Hydroxycyclohexyl phenyl ketone, 2,4-diethyl thioxanthone-9-one or the like can be used. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used. Among these compounds, compounds that are decomposed by ultraviolet rays are preferable from the viewpoint of workability. More preferably, a compound that decomposes with light having a wavelength of 365 nm is preferable.

  (B) Thermal polymerization initiators include benzoyl peroxide, lauroyl peroxide, t-butyl peroxide benzoate, t-amyl peroxide benzoate, t-amyl peroxyneodecanoate, t-butyl peroxyneodeca Noate, t-amyl peroxyisobutyrate, di (t-butyl) peroxide, dicumyl peroxide, cumene hydroperoxide, 1,1-di (t-butylperoxy) cyclohexane, 2,2-di ( t-Butylperoxy) butane, t-butyl hydroperoxide, di (s-butyl) peroxycarbonate, methyl ethyl ketone peroxide, and the like can be used. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used. Among these compounds, from the viewpoint of curing temperature, compounds having a one-hour half-life temperature in the range of 100 ° C. to 150 ° C. such as 1,1-di (t-butylperoxy) cyclohexane are desirable.

  Moreover, although the structural component of a thermosetting resin is not specifically limited, It is preferable that a vinyl ester resin and a radical polymerization initiator are included.

  (C) Inorganic compounds include metal oxides such as silicon oxide (silica), aluminum oxide (alumina), zirconium oxide (zirconia), titanium oxide (titania), kaolin, talc, mica, calcium silicate, cytillin, nitriding Boron, sepiolite, calcium carbonate, potassium titanate, aluminum borate, barium sulfate, montmorillonite, hydrotalcite, magnesium hydroxide, aluminum hydroxide and the like can be used. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used. Among these compounds, kaolin, plate-like alumina, citirine, boron nitride, mica and the like having a scaly shape are preferable from the viewpoint of insulating properties.

  Further, the resin composition preferably contains (D) a compound having two or more carbon-carbon double bonds capable of radical polymerization as a crosslinking agent.

  (D) As the compound having two or more carbon-carbon double bonds capable of radical polymerization, unsaturated polyester resins, vinyl ester resins, vinyl-modified isocyanates and the like can be used. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used.

  The unsaturated polyester resin is not particularly limited, and can be obtained, for example, by subjecting a dibasic acid and a polyhydric alcohol to a condensation reaction.

  Dibasic acids used as raw materials for unsaturated polyester resins include α, β-unsaturated dibasic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, phthalic acid, and phthalic anhydride. , Halogenated phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, sebacine Acid, 1,10-decanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic anhydride, 4,4′-biphenyl Use dicarboxylic acids and saturated dibasic acids such as dialkyl esters. Can. However, it is not particularly limited to these compounds. Only one kind of these dibasic acids or the like may be used, or two or more kinds may be appropriately mixed and used.

  Examples of the polyhydric alcohol used as a raw material for the unsaturated polyester resin include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 2-methyl-1,3-propanediol, 1 , 3-butanediol, adducts of bisphenol A and propylene oxide or ethylene oxide, glycerin, trimethylolpropane, 1,3-propanediol, 1,2-cyclohexane glycol, 1,3-cyclohexane glycol, 1,4-cyclohexane Glycol, para-xylene glycol, bicyclohexyl-4,4'-diol, 2,6-decalin glycol, tris (2-hydroxyethyl) isocyanurate, etc. It can be used. However, it is not particularly limited to these compounds. In addition, amino alcohols such as ethanolamine may be used. Only one kind of these polyhydric alcohols may be used, or two or more kinds may be appropriately mixed. If necessary, a dicyclopentadiene compound may be incorporated in the resin skeleton.

  As an epoxy compound used as a raw material for the vinyl ester resin, a compound having at least two epoxy groups in the molecule is used. Examples of such epoxy compounds include epibis type glycidyl ether type epoxy resins obtained by condensation reaction of bisphenols such as bisphenol A, bisphenol F, and bisphenol S with epihalohydrin, and phenols such as phenol, cresol, and bisphenol. Novolak type glycidyl ether type epoxy resin obtained by condensation reaction of novolak and epihalohydrin, which is a condensate of alcohol and formalin, glycidyl ester type epoxy resin obtained by condensation reaction of tetrahydrophthalic acid, hexahydrophthalic acid and epihalohydrin, 4,4'-biphenol, 2,6-naphthalenediol, hydrogenated bisphenol and glycols and a glycidyl ether type ester obtained by condensation reaction with epihalohydrin Carboxymethyl resins and can be used hydantoin and amine-containing glycidyl ether obtained by condensation reaction of a cyanuric acid with epihalohydrin epoxy resin. However, it is not particularly limited to these compounds. Only one kind of these epoxy compounds may be used, or two or more kinds may be appropriately mixed and used.

  As an unsaturated monobasic acid used as a raw material for the vinyl ester resin, for example, acrylic acid, methacrylic acid, crotonic acid and the like can be used. Moreover, you may use half esters, such as maleic acid and itaconic acid. However, it is not particularly limited to these. These unsaturated monobasic acids may be used alone or in a suitable mixture of two or more. Among these compounds, a vinyl ester resin obtained by reacting an epibis type glycidyl ether type epoxy resin and methacrylic acid is preferable from the viewpoint of heat resistance and curability. Further, from the viewpoint of crack resistance of the cured product, a non-novalac type vinyl ester resin is preferable.

You may add other arbitrary components to the thermosetting resin composition mentioned above as needed. Examples of the optional component include a radical polymerizable monomer, a curing accelerator, a polymerization inhibitor, and an adhesion improver. The radical polymerizable monomer includes styrene, vinyl toluene, vinyl naphthalene, α-methyl styrene. Vinyl pyrrolidone, acrylamide, acrylonitrile, allyl alcohol, allyl phenyl ether, (meth) acrylic acid ester, vinyl acetate, vinyl pyrrolidone, (meth) acrylamide, maleic acid diester, and fumaric acid diester. However, it is not particularly limited to these compounds. Preferably, styrene, vinyl toluene, and (meth) acrylic acid ester (for example, methacrylate, acrylate) are used. Examples of (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, and isodecyl. (Meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, isobornyl (meth) acrylate, methoxylated cyclotriene (Meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydride Xylpropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polyethylene glycol (meth) acrylate, alkyloxypolypropylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) Acrylate, glycidyl (meth) acrylate, caprolactone modified tetrafurfuryl (meth) acrylate, ethoxycarbonylmethyl (meth) acrylate, 2-ethylhexyl carbitol acrylate, 1,4-butanediol (meth) acrylate, acrylonitrile butadiene methacrylate, di And cyclopentenyloxyethyl methacrylate. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used. Preferably, (meth) acrylates that do not inhibit decomposition of the photopolymerization initiator and have high reactivity are preferable.

  Examples of the curing accelerator include metal salts of naphthenic acid or octylic acid (metal salts of cobalt, zinc, zirconium, manganese, calcium, etc.). These may use only 1 type and may mix 2 or more types suitably.

  Examples of the polymerization inhibitor include quinones such as hydroquinone, para tertiary butyl catechol, and pyrogallol. These may use only 1 type and may mix 2 or more types suitably.

Examples of the adhesion improver include p-styryltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, and 3-methacryloxypropyltriethoxysilane. These may use only 1 type and may mix 2 or more types suitably.
(Method for producing thermosetting resin composition)
The thermoplastic resin composition described above comprises (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) two radically polymerizable carbon-carbon double bonds. The compound having the above and other optional components are produced by uniformly stirring and mixing in air.

The thermosetting resin composition described above can be used for insulating and fixing applications of stator windings of rotating electrical machines.
(Rotating electric machine using thermosetting resin composition)
Next, the example of implementation of the rotary electric machine using the thermoplastic resin composition mentioned above is described. Embodiment described below is an example to the last, and is not limited to these Examples. In the following description, an electric motor used in a hybrid vehicle is used as an example of a rotating electric machine. In the following description, the “axial direction” refers to a direction along the rotation axis of the rotating electrical machine. The “circumferential direction” refers to a direction along the rotation direction of the rotating electrical machine. The “radial direction” refers to a radial direction (radial direction) when the rotation axis of the rotating electrical machine is the center. “Inner circumference side” refers to the radially inner side (inner diameter side), and “outer circumference side” refers to the opposite direction, that is, the radially outer side (outer diameter side).

  FIG. 1 is a cross-sectional view showing a configuration of a rotating electrical machine 10 according to the present embodiment. The rotating electrical machine 10 includes a housing 50, a stator 20, a stator core 21, a stator coil 60, and a rotor 11.

  The stator 20 is fixed to the inner peripheral side of the housing 50. The rotor 11 is rotatably supported on the inner peripheral side of the stator 20. The housing 50 constitutes an outer casing of an electric motor that is formed into a cylindrical shape by cutting an iron-based material such as carbon steel, casting of cast steel or aluminum alloy, or pressing. The housing 50 is also referred to as a frame or a frame.

  A liquid cooling jacket 130 is fixed to the outer peripheral side of the housing 50. The inner peripheral wall of the liquid cooling jacket 130 and the outer peripheral wall of the housing 50 constitute a refrigerant passage 153 for a liquid refrigerant RF such as oil, and the refrigerant passage 153 is formed so as not to leak. The liquid cooling jacket 130 houses the bearings 144 and 145 and is also called a bearing bracket.

  In the case of direct liquid cooling, the refrigerant RF passes through the refrigerant passage 153 and flows out from the refrigerant outlets 154 and 155 toward the stator 20 to cool the stator 20.

  The stator 20 includes a stator core 21 and a stator coil 60. The stator core 21 is made by laminating thin sheets of silicon steel plates. The stator coil 60 is wound around a plurality of slots 15 provided in the inner peripheral portion of the stator core 21. Heat generated from the stator coil 60 is transferred to the housing 50 through the stator core 21 and is radiated by the refrigerant RF flowing in the liquid cooling jacket 130.

  The rotor 11 includes a rotor iron core 12 and a rotating shaft 13. The rotor core 12 is made by laminating thin sheets of silicon steel plates. The rotating shaft 13 is fixed to the center of the rotor core 12. The rotating shaft 13 is rotatably held by bearings 144 and 145 attached to the liquid cooling jacket 130 and rotates at a predetermined position in the stator 20 at a position facing the stator 20. The rotor 11 is provided with a permanent magnet 18 and an end ring (not shown).

  In assembling the rotating electrical machine, the stator 20 is inserted into the housing 50 in advance and attached to the inner peripheral wall of the housing 50, and then the rotor 11 is inserted into the stator 20. Next, the rotating shaft 13 is assembled to the liquid cooling jacket 130 so that the bearings 144 and 145 are fitted.

  FIG. 2 is a perspective view of the stator 20 used in the rotating electrical machine 10 according to the present embodiment. The structure of the principal part of the stator 20 is demonstrated using FIG.

  The stator 20 includes a stator core 21 and a stator coil 60 wound around a plurality of slots 15 provided on the inner peripheral portion of the stator core. The stator coil 60 uses a conductor (copper wire in this embodiment) having a substantially rectangular cross section. By using the coil conductor having a substantially rectangular cross section, the space factor in the slot is improved, and the efficiency of the rotating electrical machine is improved.

  A slot liner 302 is disposed in each slot 15 to ensure electrical insulation between the stator core 21 and the stator coil 60. The slot liner 302 is formed in a B shape or an S shape so as to wrap a copper wire.

  FIG. 3 is a perspective view showing the welding-side coil end 62 of the stator coil before application of the resin composition. The stator 20 includes a stator core 21 and a stator coil 60 wound around a plurality of slots 15 provided on the inner peripheral portion of the stator core. Insulating paper 300 is annularly arranged between the coils for insulation between the coils. Insulating paper 301 is annularly arranged between the welded portions for insulation between the welded portions.

  After the insulating papers 300 and 301 are disposed, the entire stator coil can be subjected to (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) radical polymerization. And a cured product of the resin composition 601 including a compound having two or more carbon-carbon double bonds.

  FIG. 4 is a perspective view showing the non-welding side coil end 61 of the stator coil before application of the resin composition. Insulating paper 301 is annularly arranged between the coils for insulation between the coils.

  Similarly to the welding side coil end 62, the insulating coil is also disposed at the anti-welding side coil end 61, and then the entire stator coil is substantially uniformly covered with the cured product of the resin composition 601. Here, the resin composition 601 is the same material ((A) photopolymerization initiator, (B) thermal polymerization initiator, (C) inorganic additive, (D) radical polymerization as that covering the welding side coil end 62). A compound having two or more possible carbon-carbon double bonds).

  FIG. 5 is an enlarged view of the vicinity of the conductor end 28 </ b> E of the welding side coil end 62. The segment conductor 28 has an insulating coating portion 29A covered with an insulating coating such as an enamel coating, and a conductor exposed portion 29B from which the insulating coating is peeled and the conductor portion (copper wire) is exposed. The conductor exposed portion 29B is provided at the conductor end portion 28E. This exposure of the conductor portion is due to welding. Further, the entire segment conductor 28 including the insulating coating portion 29A and the exposed conductor portion 29B is composed of (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) a radical. It is almost uniformly covered with a cured product of the resin composition 601 made of a compound having two or more polymerizable carbon-carbon double bonds.

  In the present embodiment, the second resin member as used in the prior art is not used, and only the resin composition 601 is used. In addition, since the thickness is uniform regardless of whether it is in the vicinity of the joint or not, a double production facility is not required for the adhesion and drying of the resin member, and more material than the resin member necessary for the dielectric strength is not required. effective.

  FIG. 6 is an enlarged view of the vicinity of the anti-welding side coil end apex 28 </ b> C of the anti-welding side coil end 61. In the non-welding side coil end 61, an insulation coating portion 29 </ b> A is formed over the entire circumference of the segment conductor 28. Further, the segment conductor 28 is formed of (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) a radical polymerizable carbon- It is almost uniformly covered only with a cured product of the resin 601 made of a compound having two or more carbon double bonds. Since the second resin member used in the prior art is not used and the thickness is uniform, a double production facility is not required for adhesion and drying of the resin member, and the resin member necessary for insulation withstand voltage There is an effect that the above materials are unnecessary.

  In this configuration described above, the entire stator coil is made up of (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) a radically polymerizable carbon-carbon two-carbon. Insulating properties required for electric vehicles and hybrid electric vehicles can be obtained by substantially uniformly covering only with a resin 601 made of a compound having two or more double bonds and by disposing cyclic insulating resins 300 and 301 for reinforcing insulation. A satisfactory rotating electrical machine can be obtained.

  Although the resin composition 601 is desirably covered almost uniformly, the boundary surface with the insulating paper 300 and 301 and the complicated shape portion of the coil may adhere unevenly. The term “substantially uniform” as used herein means that the thickness is not intentionally increased as in the prior art (for example, Patent Document 1).

  In addition, “only” in the description that the resin composition 601 is almost uniformly covered does not exclude the presence of an insulating coating formed on a conductor in advance, such as an enamel coating. Here, “only” means that the resin resin 601 is the only insulating resin applied to reinforce the insulation after the segment conductor 28 is molded, and the second resin member in the prior art is not used. .

In the above, a permanent magnet type rotating electrical machine has been described, but since the feature of the present invention relates to the coil insulation of the stator, the rotor is not a permanent magnet type, but an induction type, synchronous reluctance, It can be applied to a claw magnetic pole type. In addition, the winding method is a wave winding method, but any winding method having similar characteristics can be applied. Further, although the explanation is made with the inner rotation type, the same applies to the outer rotation type.
(Composition example of thermosetting resin composition)
Subsequently, heat comprising (A) a photopolymerization initiator, (B) a thermal polymerization initiator, (C) an inorganic additive, and (D) a compound having two or more carbon-carbon double bonds capable of radical polymerization. The composition example of curable resin is illustrated. However, it is not limited to the composition example shown below.

  Composition Example 1 includes 50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1.0 part by weight of 2,2-diethoxyacetophenone (manufactured by Wako Pure Chemical Industries), 1 , 1-Di (t-butylperoxy) cyclohexane 1.5 parts by weight (manufactured by NOF Corporation) and 10 parts by weight of mica are added to obtain a thermosetting resin composition.

  Composition example 2 is 50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 50 parts by weight of an unsaturated polyester resin having a bisphenol A skeleton and a number average molecular weight of 3000, and 1.0 weight of 2-hydroxy-2-methylpropiophenone. Parts (manufactured by Tokyo Chemical Industry Co., Ltd.), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (manufactured by NOF) and 10 parts by weight of boron nitride are added to obtain a thermosetting resin composition.

  Composition Example 3 is composed of 70 parts by weight of dicyclopentenyloxyethyl (meth) acrylate (manufactured by Aldrich), 30 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), and 1.0 weight of 2-hydroxy-2-methylpropiophenone. Parts (manufactured by Tokyo Chemical Industry Co., Ltd.), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (manufactured by NOF) and 10 parts by weight of mica are added to obtain a thermosetting resin composition.

  Composition example 4 is an unsaturated compound containing 70 parts by weight of dicyclopentenyloxyethyl (meth) acrylate (manufactured by Aldrich), 30 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), and having a number average molecular weight of 3000. 5 parts by weight of polyester resin, 1.0 part by weight of 2-hydroxy-2-methylpropiophenone (manufactured by Tokyo Chemical Industry), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (manufactured by NOF Corporation) ), 10 parts by weight of mica is added to obtain a thermosetting resin composition.

  Composition Example 5 is an unsaturated compound containing 70 parts by weight of dicyclopentenyloxyethyl (meth) acrylate (manufactured by Aldrich), 30 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), and having a number average molecular weight of 3000. 5 parts by weight of polyester resin, 1.0 part by weight of 2-hydroxy-2-methylpropiophenone (manufactured by Tokyo Chemical Industry), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (manufactured by NOF Corporation) ), 20 parts by weight of mica is added to obtain a thermosetting resin composition.

Composition Example 6 is composed of 70 parts by weight of dicyclopentenyloxyethyl (meth) acrylate (manufactured by Aldrich), 30 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), and 1.0 weight of 2-hydroxy-2-methylpropiophenone. Parts (manufactured by Tokyo Chemical Industry Co., Ltd.), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (manufactured by NOF), 10 parts by weight of mica, 0.05 parts by weight of manganese naphthenate (manufactured by Tokyo Chemical Industry) Then, 5 parts by weight of an unsaturated polyester resin composed of isophthalic acid, maleic acid and ethylene glycol and 0.1 part by weight of 3-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone) are added to obtain a thermosetting resin composition.
(Comparative example of thermosetting resin composition)
Then, the comparative example about the composition of a thermosetting resin is shown.

  Comparative Example 1 does not contain (A) a photopolymerization initiator. In Comparative Example 1, 50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1.5 parts by weight of 1,1-di (t-butylperoxy) cyclohexane (day) Oil) and 10 parts by weight of mica were added to obtain a thermosetting resin composition. In this case, it was not possible to form an insulation coating on the welding side coil end.

  Comparative Example 2 does not contain (B) a thermal polymerization initiator. In Comparative Example 2, 50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1.0 part by weight of 2,2-diethoxyacetophenone (manufactured by Wako Pure Chemical Industries), mica 10 parts by weight was added to obtain a thermosetting resin composition. In this case, the coil in the slot could not be fixed.

Comparative Example 3 does not contain (C) an inorganic additive. In Comparative Example 3, 50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1.0 part by weight of 2,2-diethoxyacetophenone (manufactured by Wako Pure Chemical Industries), 1 , 1-di (t-butylperoxy) cyclohexane 1.5 parts by weight (manufactured by NOF Corporation) was added to obtain a thermosetting resin composition. In this case, the electrical characteristics did not reach the target.
(Method for coating thermosetting resin composition)
Next, a method for coating the coil portion of the stator 20 with the resin having the above composition will be described. The resin composition 601 is impregnated in an electric device such as a motor coil using an immersion method, a drop impregnation method, or the like. The impregnation method is a conventional method and is not particularly limited. By irradiating the coil impregnated with resin with energy rays, the irradiated portion is cured. The energy ray is preferably ultraviolet rays generated from a mercury lamp or the like. Moreover, a wavelength can be suitably selected with the (A) photoinitiator to be used. After energy beam irradiation, the resin composition 601 applied to the stator 20 is completely cured by heating. The main heating is performed by a conventional method such as a hot air heating furnace or an IH heating furnace, and there is no particular limitation.

  As described above, according to the present invention, it is possible to provide a stator for a rotating electrical machine that has excellent insulation properties and excellent cooling performance despite its small size and high output.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine 11 Rotor 12 Rotor core 13 Rotating shaft 15 Slot 18 Permanent magnet 20 Stator 21 Stator core 28C Non-welding side coil end apex 28D Conductor skew part 28E Conductor end part 28F Conductor skew part 50 Housing 60 Fixed Child coil 61 Anti-welding side coil end 62 Welding side coil end 130 Liquid cooling jacket 144 Bearing 145 Bearing 150 Refrigerant (oil) storage space 153 Refrigerant passage 154 Refrigerant outlet 155 Refrigerant outlet 300 Annular insulating paper 301 Annular insulating paper 302 Slot liner 601 Resin Components RF refrigerant

Claims (9)

  A thermosetting resin composition for rotating electrical machines, comprising a photopolymerization initiator, a thermal polymerization initiator, and an inorganic additive. The thermosetting resin composition for a rotating electrical machine according to claim 1,
A thermosetting resin composition for a rotating electrical machine comprising the scale-like inorganic additive. A thermosetting resin composition for a rotating electrical machine according to claim 2,
A thermosetting resin composition for rotating electrical machines, which contains mica as the scale-like inorganic additive. A thermosetting resin composition for a rotating electrical machine according to any one of claims 1 to 3,
A thermosetting resin composition for a rotating electrical machine comprising a compound having two or more carbon-carbon double bonds capable of radical polymerization. The thermosetting resin composition for a rotating electrical machine according to claim 4,
A thermosetting resin composition for a rotating electrical machine comprising an unsaturated polyester resin or vinyl ester resin as a compound having two or more carbon-carbon double bonds capable of radical polymerization. A thermosetting resin composition for a rotating electrical machine according to claim 5,
A thermosetting resin composition for a rotating electrical machine, comprising an unsaturated polyester resin or a non-novolac vinyl ester resin as a compound having two or more carbon-carbon double bonds capable of radical polymerization.   The stator for rotary electric machines provided with the coil coat | covered with the thermosetting resin composition for rotary electric machines in any one of Claims 1 thru | or 6. The stator for a rotating electrical machine according to claim 7,
The coil is composed of a plurality of segment conductors,
The segment conductor has an insulating coating portion covered with an insulating coating, and a conductor exposed portion where the conductor is exposed,
The plurality of segment conductors are joined at each conductor exposed portion,
The said thermosetting resin composition for rotary electric machines is a stator for rotary electric machines which coat | covers the said insulation coating part and the said conductor exposed part.   A rotating electrical machine comprising the stator for a rotating electrical machine according to claim 7.