WO2016017563A1 - Stator for rotary electric machine, and rotary electric machine provided with same - Google Patents

Abstract

Provided are a stator for a rotary electric machine, said stator having excellent insulation properties, and a rotary electric machine provided with said stator. In order to solve this problem, the present invention provides a stator 20 for a rotary electric machine, said stator having a stator coil 60 that is disposed in a slot 15 of a stator iron core 21 and being configured such that: the stator coil is composed of a plurality of segment conductors; the segment conductors have an insulation-coated portion that is covered with an insulation coating, and an exposed conductor portion in which a conductor is exposed, and are joined to the other segment conductors via the exposed conductor portion; and the stator coil is covered with a thermosetting resin composition including a polymerizable monomer that has a boiling point of less than 200 °C, and a thermoplastic resin that is soluble in the polymerizable monomer.

Description

Rotating electric machine stator and rotating electric machine equipped with the same

The present invention relates to a stator of a rotating electrical machine and 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 of the second coil end group (see, for example, Patent Document 1).

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

Japanese Patent No. 3770263 JP 2012-90433 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 to 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.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above-described problems. For example, in a stator of a rotating electric machine in which a stator coil is disposed in a slot of a stator core, the stator coil includes a plurality of means. The segment conductor includes an insulating coating portion covered with an insulating coating, and a conductor exposed portion where the conductor is exposed, and is joined to another segment conductor via the conductor exposed portion. The stator coil is covered with a thermosetting resin composition containing a polymerizable monomer having a boiling point of less than 200 ° C. and a thermoplastic resin soluble in the polymerizable monomer. It is characterized by that.

According to the present invention, it is possible to provide a stator of a rotating electrical machine having excellent insulation and a rotating electrical machine including the stator.

Issues, configurations, and effects other than those described above will be clarified by the description of the following examples.

Sectional drawing which shows the whole structure of the rotary electric machine apparatus containing the stator by the Example of this invention. The perspective view which shows the structure of the stator to which this invention is applied. The cross-sectional perspective view which shows the welding side coil end part of the stator coil in the rotary electric machine before varnish application | coating. The cross-sectional perspective view which shows the non-welding side coil end part of the stator coil in the rotary electric machine 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 the thermosetting resin comprises (A) a polymerizable monomer having a boiling point of less than 200 ° C. and (B) (A) component. It has been found that a thermosetting resin composition containing a soluble thermoplastic resin is preferable.

Hereinafter, the thermosetting resin composition according to the present invention will be described in detail.

[Component (A)] A polymerizable monomer having a boiling point of less than 200 ° C.
The polymerizable monomer is not particularly limited as long as its boiling point is less than 200 ° C., and examples thereof include alkenes such as styrene, vinyl toluene, 1-hexene, 1-octene, and vinylcyclohexane, ) (Meth) acrylic esters such as methyl acrylate and ethyl (meth) acrylate, vinyl esters such as vinyl acetate and vinyl propionate, vinyl ethers such as vinyl ethyl ether and vinyl propyl ether, 1-hexene-3 Examples thereof include bifunctional polymerizable monomers such as hydroxyl-containing alkenes such as all, hydroxyethyl (meth) acrylate, and ethylene glucoglycol vinyl ether, (meth) acrylic acids, and divinylbenzene. Only one kind of these compounds may be used, or two or more kinds may be appropriately mixed and used. Among these compounds, styrene and vinyltoluenes are preferable from the viewpoints of solubility of the thermoplastic resin and other components, heat resistance of the cured resin, and insulation.

[Component (B)] Thermosetting resin composition containing thermoplastic resin soluble in component (A)
The thermoplastic resin soluble in the component (A) is not particularly limited. Polyalkenes such as polystyrene, polyvinyltoluene, polyvinylnaphthalene, polyhexene, poly (meth) acrylate, poly (meth) acrylic acid Poly (meth) acrylates such as ethyl, poly (meth) acrylate hydroxyethyl, polyvinyl esters such as polyvinyl acetate and vinyl polypropionate, polyvinyl ethers such as polyvinyl ethyl ether and polyvinyl propyl ether, polyethylene Examples include glycols and polyethylene glycols such as polyethylene glycol dimethyl ether and polyethylene oxide. 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 viewpoints of solubility in the component (A), heat resistance, and insulation, poly (meth) acrylates such as polystyrene, polyvinyltoluenes and poly (meth) methyl acrylate are preferable. Further, the molecular weight of these thermoplastic resins is not particularly limited, but the number average molecular weight is preferably in the range of 5,000 to 1,000,000 from the viewpoints of coatability and solubility. Furthermore, a number average molecular weight in the range of 10,000 to 500,000 is more preferable. When the number average molecular weight is less than 5,000, the covering property is lowered, and when the number average molecular weight is more than 1,000,000, the solubility in the thermosetting resin composition is lowered.

The constituent components of the thermosetting resin are not particularly limited, but it is preferable that (C) a vinyl ester resin and (D) a radical polymerization initiator be included.

[(C) component] (C) vinyl ester resin
The vinyl ester resin is not particularly limited as long as it can be obtained, for example, by reacting an epoxy compound and an unsaturated monobasic acid using an esterification catalyst.

The epoxy compound used as a raw material for the vinyl ester resin is a compound having at least two epoxy groups in the molecule and is not particularly limited. Specifically, for example, bisphenol A, bisphenol F, and the like. Epibis-type glycidyl ether type epoxy resin obtained by condensation reaction of bisphenols such as bisphenol S and epihalohydrin; Novolac type glycidyl ether type epoxy resin obtained; tetrahydrophthalic acid, glycidyl ester type epoxy resin obtained by condensation reaction of hexahydrophthalic acid and epihalohydrin, 4,4'-biphenol Glycidyl ether type epoxy resin obtained by condensation reaction of 2,6-naphthalenediol, hydrogenated bisphenol or glycol and epihalohydrin; amine-containing glycidyl ether type epoxy resin obtained by condensation reaction of hydantoin or cyanuric acid and epihalohydrin, etc. Can be mentioned. Only one kind of these epoxy compounds may be used, or two or more kinds may be appropriately mixed and used.

The unsaturated monobasic acid used as a raw material for the vinyl ester resin is not particularly limited, and specific examples include acrylic acid, methacrylic acid, and crotonic acid. Moreover, you may use half esters, such as maleic acid and itaconic acid. These unsaturated monobasic acids may be used alone or in a suitable mixture of two or more. Among these compounds, vinyl ester resins obtained by reacting an epibis type glycidyl ether type epoxy resin and methacrylic acid are preferable from the viewpoint of heat resistance and curability.

[Component (D)] Radical polymerization initiator
The radical polymerization initiator is not particularly limited, and examples thereof include organic peroxides, organic azo compounds, and alkylboranes.

Examples of organic peroxides include benzoyl peroxide, lauroyl peroxide, t-butyl peroxide benzoate, t-amyl peroxide, t-amyl peroxyneodecanoate, and t-butyl peroxyneodecanoate. , T-amyl peroxyisobutyrate, di-t-butyl peroxide, dicumyl peroxide, cumene hydroperoxide, 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (t-butyl) Peroxy) butane, t-butyl hydroperoxide, di (s-butyl) peroxycarbonate, methyl ethyl ketone peroxide, etc., but are not particularly limited, and these may be used alone or in combination of two or more. May be.

Examples of organic azo compounds include 2,2′-azobis (isobutyronitrile), 1,1′-azobis (cyclohexanecarbonitrile), 4,4′-azobis (4-cyanovaleric acid), 2,2 'Azobis (2-methylpropionamidine) dihydrochloride and the like. These may be used alone or in combination of two or more.

Examples of the alkylborane include triethylborane, tripropylborane, triisopropylborane, tri-n-butylborane, tri-n-amylborane, tri-n-hexylborane, tricyclohexylborane, and 9-borabicyclo [3.3.1] nonane. , Isopinocan phenylborane, diethylmethylborane, diethylpropylborane, diethylbutylborane, ethylpropylbutylborane and the like. Alternatively, examples of the boron compound oxide obtained by partially oxidizing these include diethylethoxyborane, dibutylbutoxyborane, diethylmethoxyborane, ethyldimethoxyborane, ethyldiethoxyborane, and ethylethoxymethoxyborane. These may be used alone or in combination of two or more.

Further, organic peroxides, organic azo compounds, and alkylboranes may be used alone or in combination of two or more.

[Other optional ingredients]
You may add another arbitrary component to the thermosetting resin composition of this invention as needed. Examples of optional components include unsaturated polyester resins, curing accelerators, polymerization inhibitors, and adhesive strength improvers.

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.

Specific examples of the dibasic acid used as a raw material for the unsaturated polyester resin include α, β-unsaturated dibasic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, and itaconic anhydride. Phthalic acid, 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, sebacic acid, 1,10-decanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid anhydride 4,4'-biphenyldicarboxylic acid, and dialkyl esters thereof Such a saturated dibasic acid, and the like, but not particularly limited. Only one kind of these dibasic acids may be used, or two or more kinds may be appropriately mixed and used.

Specific examples of the polyhydric alcohol used as the raw material for the unsaturated polyester resin include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, and 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) Le) Although isocyanurate, but is not particularly limited. 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 into the resin skeleton.

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 be used alone or in combination of two or more. May be.

Examples of the polymerization inhibitor include quinones such as hydroquinone, paratertiary butyl catechol, and pyrogallol, and these may be used alone or in combination of two or more.

Examples of the adhesive strength improver include p-styryltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, etc. These may be used alone or as appropriate. The above may be mixed.

[Production method of the present composition]
As a method for producing the thermoplastic resin composition of the present invention, first, (A) a polymerizable monomer having a boiling point of less than 200 ° C., (B) a thermoplastic resin soluble in component (A), (C) The vinyl ester resin, (D) radical polymerization initiator, and other optional components are uniformly stirred and mixed in the air to obtain a resin composition.

The thermosetting resin composition of the present invention can be used for insulating and fixing the stator winding of a rotating electric machine.

[Example]
Next, embodiments of the present invention will be described with reference to the drawings.
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, “axial direction” refers to a direction along the rotation axis of the rotating electrical machine. The circumferential direction refers to the direction along the rotational direction of the rotating electrical machine. The “radial direction” refers to a radial direction (radial direction) when the rotational 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 rotating electrical machine having a stator according to the present invention. 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 flows through the refrigerant passage 153 and flows out of the refrigerant outlets 154 and 155 toward the stator 20 to cool the stator 20.

The stator 20 is composed of 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 liquid cooling jacket 130 via the stator core 21 and is radiated by the refrigerant RF flowing through the liquid cooling jacket 130.

The rotor 11 is composed of a rotor 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.

The detailed configuration of the main part of the stator 20 used in the rotating electrical machine 10 according to the present embodiment will be described with reference to 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 to improve the space factor in the slot, thereby improving the efficiency of the rotating electrical machine.

Further, 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 into a B shape or an S shape so as to wrap a copper wire.

The detailed configuration of the welded portion (welding side coil end 62) of the stator 20 used in the rotating electrical machine 10 will be described with reference to 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 coil having a substantially rectangular cross section, improves the space factor in the slot, and improves the efficiency of the rotating electrical machine. Insulating paper 300 is annularly arranged for insulation between the coils. Insulating paper 301 is annularly arranged for insulation between the welds.

After the insulating paper is disposed, the entire stator coil is composed of (A) a polymerizable monomer having a boiling point of less than 200 ° C. and (B) a thermoplastic resin soluble in component (A). Cover substantially uniformly only with the cured product 601.

The detailed configuration of the anti-welded part (anti-weld side coil end 61) of the stator 20 will be described with reference to 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 coil having a substantially rectangular cross section, thereby improving the space factor in the slot and improving the efficiency of the rotating electrical machine. Insulating paper 301 is annularly arranged for insulation between the coils.

Similarly to the welding side coil end 62, the anti-welding side coil end 61 also covers the entire stator coil almost uniformly with only the cured product of the resin composition 601 after the insulating paper is disposed. Here, the resin composition 601 is the same material that covers the welding side coil end 62 ((A) a polymerizable monomer having a boiling point of less than 200 ° C., and (B) a thermoplastic resin that is soluble in the component (A). Resin composition).

FIG. 5 is an enlarged view of the vicinity of the conductor end portion 28E of the welding side coil end 62. FIG. The segment conductor 28 is an exposed conductor in which the insulating coating 29A (the portion shown by shading in FIG. 7) covered with an insulating coating such as an enamel coating and the conductive coating (copper wire) are exposed by peeling off the insulating coating. Part 29B. The conductor exposed portion 29B is provided at the conductor end portion 28E. This conductor portion is exposed for welding. Further, the entire segment conductor 28 including the insulating coating portion 29A and the exposed conductor portion 29B is composed of (A) a polymerizable monomer having a boiling point of less than 200 ° C., and (B) a thermoplastic that is soluble in the component (A). It is almost uniformly covered only with a cured product of the resin composition 601 made of resin. 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.

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 includes a resin 601 made of (A) a polymerizable monomer having a boiling point of less than 200 ° C. and (B) a thermoplastic resin soluble in the component (A) so as to cover the insulating coating portion 29A. It is almost uniformly covered only with the cured product. 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.

With this configuration, the entire stator coil is substantially uniform only with the resin 601 made of (A) a polymerizable monomer having a boiling point of less than 200 ° C. and (B) a thermoplastic resin soluble in the component (A). Further, by disposing the annular insulating resins 300 and 301 for reinforcing the insulation, it is possible to obtain a rotating electrical machine that satisfies the insulating properties required for electric vehicles and hybrid electric vehicles.

In the above, the resin used for forming the insulating coating was an unsaturated polyester resin from the viewpoints of cost and insulation, permeability and curability. As the unsaturated polyester resin, both a solvent type in which the resin is diluted with a solvent and a solventless type in which the resin is not diluted with a solvent can be used. Saturated polyester resins are more preferable, and non-styrene unsaturated polyester resins are more preferable in order to prevent deterioration of characteristics due to component volatilization during curing.

Although the resin composition 601 is desirably covered almost uniformly, the boundary surface with the insulating paper 300 and 301 and the complicated shape part 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. The term “only” used herein means that the insulating resin applied for reinforcing the insulation after the segment conductor 28 is molded is only the resin composition 601 and does not use the second resin member in the prior art. ing.

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. Next, the explanation is made with the inner rotation type, but the same applies to the outer rotation type.

Next, a composition example of a thermosetting resin composed of (A) a polymerizable monomer having a boiling point of less than 200 ° C. and (B) a thermoplastic resin soluble in the component (A) will be described. It is not limited by these composition examples.

[Composition Example 1]
50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 10 parts by weight of polystyrene having a number average molecular weight of 14,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1,1-di (t-butylperoxy) cyclohexane 1.5 parts by weight (manufactured by NOF) is added to obtain a thermosetting resin composition.

[Composition Example 2]
50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 5 parts by weight of polystyrene having a number average molecular weight of 48,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1,1-di (t-butylperoxy) cyclohexane 1.5 parts by weight (manufactured by NOF) is added to obtain a thermosetting resin composition.

[Composition Example 3]
50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 5 parts by weight of polymethyl methacrylate having a number average molecular weight of 58,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1,1-di (t-butyl par Oxy) 1.5 parts by weight of cyclohexane (manufactured by NOF) is added to obtain a thermosetting resin composition.

[Composition Example 4]
50 parts by weight of methyl methacrylate (manufactured by Wako Pure Chemical Industries), 5 parts by weight of polystyrene having a number average molecular weight of 48,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1,1-di (t-butylperoxy) ) 1.5 parts by weight of cyclohexane (manufactured by NOF) is added to obtain a thermosetting resin composition.

[Composition Example 5]
50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 5 parts by weight of polystyrene having a number average molecular weight of 48,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1.0 part by weight of diethylmethoxyborane (manufactured by Aldrich) In addition, a thermosetting resin composition is obtained.

[Composition Example 6]
50 parts by weight of styrene (manufactured by Wako Pure Chemical Industries), 5 parts by weight of polystyrene having a number average molecular weight of 48,000, 50 parts by weight of bisphenol A glycerolate dimethacrylate (manufactured by Aldrich), 1,1-di (t-butylperoxy) cyclohexane 1.5 parts by weight (manufactured by NOF), 0.05 parts by weight of manganese naphthenate (manufactured by Tokyo Chemical Industry), 5 parts by weight of unsaturated polyester resin consisting of isophthalic acid, maleic acid and ethylene glycol, 3-methacryloxypropyltrimethoxy 0.1 part by weight of silane (manufactured by Shin-Etsu Silicone) is added to obtain a thermosetting resin composition.

Subsequently, a method of 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 by using this composition by dipping, dripping or the like. The impregnation method is a conventional method and is not particularly limited. The resin composition 601 applied to the stator 20 is completely cured by heating after drying at room temperature until the resin fluidity is no longer observed. Room temperature drying is a conventional method such as standing or under ventilation, and is not particularly limited. 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 insulating properties and excellent cooling performance despite its small size and high output.

In addition, this invention is not limited to the above-mentioned 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 (4)

In a stator of a rotating electric machine in which a stator coil is disposed in a slot of a stator core,
The stator coil is composed of a plurality of segment conductors,
The segment conductor has an insulation coating portion covered with an insulation coating, a conductor exposure portion where the conductor is exposed, and is joined to another segment conductor via the conductor exposure portion,
The stator coil is
A polymerizable monomer having a boiling point of less than 200 ° C .;
A thermoplastic resin soluble in the polymerizable monomer;
The stator of the rotary electric machine covered with the thermosetting resin composition containing this. A stator for a rotating electrical machine according to claim 1,
The thermosetting resin composition is
Vinyl ester resin,
A radical polymerization initiator;
Rotating electric machine stator including A stator for a rotating electrical machine according to claim 1 or 2,
A stator for a rotating electrical machine, wherein the polymerizable monomer is styrene or a derivative of styrene. A stator for a rotating electrical machine according to any one of claims 1 to 3,
A rotating electrical machine including a rotor.

Images