WO2023132102A1 - Stator de machine électrique rotative - Google Patents

Stator de machine électrique rotative Download PDF

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Publication number
WO2023132102A1
WO2023132102A1 PCT/JP2022/034094 JP2022034094W WO2023132102A1 WO 2023132102 A1 WO2023132102 A1 WO 2023132102A1 JP 2022034094 W JP2022034094 W JP 2022034094W WO 2023132102 A1 WO2023132102 A1 WO 2023132102A1
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WO
WIPO (PCT)
Prior art keywords
stator
resin layer
electric machine
insulating resin
rotary electric
Prior art date
Application number
PCT/JP2022/034094
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English (en)
Japanese (ja)
Inventor
孝仁 村木
慎司 山崎
源三 岩城
Original Assignee
日立Astemo株式会社
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Publication date
Application filed by 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to CN202280080716.XA priority Critical patent/CN118355587A/zh
Publication of WO2023132102A1 publication Critical patent/WO2023132102A1/fr

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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
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a stator for rotating electric machines.
  • a stator for a rotating electrical machine includes a stator core in which slots are formed, coils accommodated in the slots, and an insulating member arranged between the slots and the coils.
  • a stator core in which slots are formed, coils accommodated in the slots, and an insulating member arranged between the slots and the coils.
  • a rotating electric machine stator using aramid fiber as an insulating member is known in order to suppress dielectric breakdown between turns in the coil of the motor stator due to an increase in surge sharing voltage (Patent Document 1). Further, by using a first coil including a first insulating coating having a first dielectric constant and a second coil including a second insulating coating having a second dielectric constant lower than the first dielectric constant, A stator for a rotary electric machine that suppresses partial discharge is known (Patent Document 2).
  • the space factor of the coil decreases, so there is a problem in increasing the output.
  • the dielectric constant is a value unique to the compound, and a problem arises in high heat resistance accompanying an increase in the amount of heat generated due to an increase in output.
  • the problems of space factor and high heat resistance are solved by applying silica sol. In order to avoid this, it is necessary to use a low-concentration solution, so there is a problem with withstand voltage characteristics.
  • a stator for a rotating electric machine includes a stator core in which slots are formed, coils accommodated in the slots, and an insulating member arranged between the slots and the coils. and the insulating member includes a first insulating resin layer, a second insulating resin layer laminated in a thickness direction of the first insulating resin layer, the first insulating resin layer and the second insulating resin layer. and an inorganic filler made of granular powder dispersed between.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine;
  • FIG. It is a perspective view of a stator.
  • 4 is a cross-sectional view of an insulating member;
  • FIG. 8 is a cross-sectional view of an insulating member according to Modification 1;
  • FIG. 11 is a cross-sectional view of an insulating member according to Modification 2;
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine 10. As shown in FIG. The rotating electric machine 10 is composed of a housing 50 , a stator 20 , a stator core 21 , stator coils 60 and a rotor 11 .
  • the housing 50 is formed into a cylindrical shape by cutting a ferrous material such as carbon steel, by casting cast steel or an aluminum alloy, or by press working, and constitutes the outer covering of the rotating electric machine 10 .
  • the housing 50 is also called a frame or frame.
  • a liquid cooling jacket 130 is installed in the housing 50 .
  • the inner peripheral wall of the liquid cooling jacket 130 and the outer peripheral wall of the housing 50 form a coolant passage 153 for liquid coolant RF such as oil.
  • a 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 housing 50 via bearings 144 and 145 .
  • coolant RF flows through coolant passage 153 and flows out from coolant outlets 154 and 155 toward stator 20 to cool stator 20 .
  • the stator 20 is composed of a stator core 21 and a stator coil 60.
  • the stator core 21 is formed by stacking thin silicon steel sheets to form a stator core.
  • the stator coil 60 is wound around a number of slots 15 provided on the inner circumference of the stator core 21 . Heat generated from the stator coil 60 is transferred to the housing 50 via the stator core 21 and radiated by the coolant 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 silicon steel plates.
  • Rotor 11 in which rotating shaft 13 is rotatably supported by bearings 144 and 145 , rotates in stator 20 at a position facing stator 20 while keeping a predetermined gap from stator 20 .
  • the rotor 11 is provided with a permanent magnet 18 and an end ring (not shown).
  • the stator 20 is inserted inside the housing 50 and attached to the inner peripheral wall of the housing 50 in advance, and then the rotor 11 is inserted into the stator 20 .
  • 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.
  • the stator 20 includes a stator core 21 formed with slots 15 , stator coils 60 accommodated in the slots 15 , and insulating members 300 arranged between the slots 15 and the stator coils 60 .
  • the stator coil 60 is wound around a number of slots 15 provided in the inner circumference of the stator core 21.
  • the stator coil 60 is formed by connecting segment-shaped conductors such as copper wires having a substantially rectangular cross section. configured as The segment-shaped conductor has a substantially rectangular cross section, and when the conductor is inserted into the substantially rectangular slot 15, the space factor of the conductor in the slot 15 is improved, and the output efficiency of the rotating electric machine 10 is improved. improves.
  • An insulating member 300 is arranged in each slot 15 to ensure electrical insulation between the stator core 21 and the stator coils 60 .
  • the insulating member 300 is formed in a square shape, a B shape, or an S shape so as to wrap the conductor that forms the stator coil 60 .
  • the segment-shaped conductor is inserted into the slot 15 in which the insulating member 300 is arranged, and then the ends of the segment-shaped conductor are connected by welding or the like to form the stator coil 60 . After that, in order to fix the stator core 21 and the stator coil 60, they are impregnated with a fixing varnish and cured by heating.
  • the rotor 11 of the rotary electric machine 10 has been described as being of the permanent magnet type, the rotor 11 may be of the induction type, synchronous reluctance, claw pole type, etc., instead of the permanent magnet type.
  • the winding method of the stator coil 60 has been described using the wave winding method as an example, other winding methods may be used.
  • the internal rotation type is described, the external rotation type may be used.
  • the rotating electric machine 10 is used, for example, as a drive source for vehicles such as hybrid automobiles and electric automobiles.
  • FIG. 3 is a cross-sectional view of the insulating member 300.
  • FIG. This cross-sectional view is a cross-sectional view of the insulating member 300 in a direction orthogonal to the rotating shaft 13 of the rotor 11. As shown in FIG.
  • the insulating member 300 includes a first insulating resin layer 401, a second insulating resin layer 402 laminated in the thickness direction of the first insulating resin layer 401, and a space between the first insulating resin layer 401 and the second insulating resin layer 402. and an inorganic filler 500 made of granular powder dispersed on the surface.
  • the insulating member 300 sandwiches the inorganic filler 500 dispersed on the surface of either the first insulating resin layer 401 or the second insulating resin layer 402 between the first insulating resin layer 401 and the second insulating resin layer 402 . It is formed.
  • the details of the composition of the first insulating resin layer 401 and the second insulating resin layer 402 will be described later, they are thermoplastic resins.
  • the details of the composition of the inorganic filler 500 will be described later, it is any one of silica, alumina, talc, calcium carbonate, and boron nitride.
  • the particle size of the inorganic filler 500 is 5 ⁇ m or less, preferably less than 1 ⁇ m.
  • the inorganic fillers 500 are arranged in a straight line when the cross section in the thickness direction of the insulating member 300 is viewed from the direction perpendicular to the cross section. Since the first insulating resin layer 401 and the second insulating resin layer 402 are made of a thermoplastic resin, the inorganic filler 500 is sandwiched between them and they are bonded together by thermal fusion and/or a non-solution type adhesive.
  • the insulating member 300 has a single layer has been described, but it may have a configuration in which two or more layers are laminated according to the required withstand voltage characteristics.
  • FIG. 4 is a cross-sectional view of an insulating member 310 according to Modification 1.
  • FIG. This cross-sectional view is a cross-sectional view of the insulating member 310 in a direction orthogonal to the rotating shaft 13 of the rotor 11. As shown in FIG. The same reference numerals are assigned to the same parts as those in FIG. 3, and the description thereof will be simplified.
  • the insulating member 310 is formed by laminating adhesive layers 601 and 602 on the outermost layer sides of the first insulating resin layer 401 and the second insulating resin layer 402 of the insulating member 300 shown in FIG. Since the first insulating resin layer 401, the second insulating resin layer 402, and the inorganic filler 500 are the same as those shown in FIG. 3, their description is omitted.
  • the adhesive layers 601 and 602 are thermosetting resin containing a microcapsule-type foaming agent 600 .
  • the stator coil 60 is formed by inserting a segment-shaped conductor into the slot 15 provided with the insulating member 310 and welding the ends of the conductor. After that, in order to fix the stator core 21 and the stator coil 60 via the adhesive layers 601 and 602, induction heating and/or electric heating to the stator coil 60 is used to heat the thermosetting resin of the adhesive layers 601 and 602. is heated and cured.
  • the adhesive layers 601 and 602 contain the foaming agent 600, which is air bubbles, even if partial discharge occurs in the air bubbles due to the application of a high voltage and the adhesive layers 601 and 602 are burnt, the first insulating resin layer 401 and the adhesive layers 601 and 602 remain intact. Since the inorganic filler 500 present between the second insulating resin layer 402 and the second insulating resin layer 402 prevents the progress of burnout, the electrical insulation between the stator core 21 and the stator coil 60 is ensured, and the withstand voltage characteristics are improved.
  • FIG. 5 is a cross-sectional view of an insulating member 320 according to Modification 2.
  • FIG. This cross-sectional view is a cross-sectional view of the insulating member 320 in a direction orthogonal to the rotating shaft 13 of the rotor 11. As shown in FIG. The same reference numerals are assigned to the same portions as those in FIGS. 3 and 4, and the description thereof will be simplified.
  • the insulating member 320 has a two-layer structure of the insulating member 300 consisting of the first insulating resin layer 401 and the second insulating resin layer 402 sandwiching the inorganic filler 500 shown in FIG. and the second insulating resin layer 402, adhesive layers 601 and 602 are laminated on the outermost layer side.
  • the first insulating resin layer 401, the second insulating resin layer 402, and the inorganic filler 500 are the same as those shown in FIG. 3, and the adhesive layers 601 and 602 are the same as those shown in FIG. Description is omitted.
  • the adhesive layers 601 and 602 are thermosetting resin containing the foaming agent 600 .
  • the stator coil 60 is formed by inserting a segment-shaped conductor into the slot 15 provided with the insulating member 310 and welding the ends of the conductor. After that, in order to fix the stator core 21 and the stator coil 60 via the adhesive layers 601 and 602, induction heating and/or electric heating to the stator coil 60 is used to heat the thermosetting resin of the adhesive layers 601 and 602. is heated and cured.
  • the adhesive layers 601 and 602 contain the foaming agent 600 which is air bubbles, even if partial discharge occurs in the air bubbles due to the application of a high voltage and the adhesive layers 601 and 602 are burnt, the two-layered inorganic Since the filler 500 prevents the progress of burnout, the electrical insulation between the stator core 21 and the stator coil 60 is ensured, and the withstand voltage characteristics are improved.
  • the insulating member 300 shown in FIG. 3 has two layers has been described. 601 and 602 may be laminated.
  • the insulating member 300 is produced by dispersing the inorganic filler 500 on a thermoplastic resin film and then pasting another thermoplastic resin film.
  • the thermoplastic resin film corresponding to the first insulating resin layer 401 and the thermoplastic resin film corresponding to the second insulating resin layer 402 are preferably made of the same resin from the viewpoint of workability, and preferably have the same thickness. . If the type and thickness of the thermoplastic resin film are different, the processing and insulation characteristics of the insulating member 300 will be asymmetrical in the thickness direction, and the installation of the insulating member 300 in the slot 15 will be complicated. do not have.
  • the inorganic filler 500 is not suspended in a solution, but is sprayed as a granular powder at a high concentration according to the requirements for withstand voltage characteristics.
  • the method of laminating the thermoplastic resin film is not particularly limited, and can be selected according to the composition of the thermoplastic resin film, such as an adhesive or heat melting. When using an adhesive, a liquid is not preferable in order to prevent the inorganic filler 500 from flowing and aggregating after the inorganic filler 500 is sprayed.
  • the insulating member 310 has adhesive layers 601 and 602, which are thermosetting resin containing a foaming agent, laminated on the outermost layer side.
  • the adhesive layers 601 and 602 are produced by uniformly stirring and mixing a microcapsule-type foaming agent 600, epoxy resin, unsaturated polyester resin, vinyl ester resin, and other components as base materials. . A solvent may be added as necessary. Then, a thermosetting resin containing a foaming agent 600 is applied to the outermost layer side.
  • the insulating member 320 is composed of the first insulating resin layer 401 and the second insulating resin layer 402 with the inorganic filler 500 sandwiched therebetween. Adhesive layers 601 and 602 are laminated on the outermost layer side of .
  • the stator 20 of the rotary electric machine 10 is provided with excellent withstand voltage characteristics of the insulating members 300, 310, and 320 by using the inorganic filler 500 that does not require solvent removal and that can be increased in concentration. can.
  • composition and the like of the first insulating resin layer 401 and the second insulating resin layer 402, the inorganic filler 500, and the adhesive layers 601 and 602 will be described below.
  • thermoplastic resin is used for the first insulating resin layer 401 and the second insulating resin layer 402 .
  • the thermoplastic resin to be used is not particularly limited, and vinyl resins such as polyethylene and polypropylene; polyester resins such as polylactide, polycaproic acid, polybutylene succinate, polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; Examples include polyamide resins such as nylon 66, nylon 6T, and Nomex (registered trademark) composed of m-phenylenediamine and isophthalic acid, and various engineering plastics such as polyphenylene sulfide, polyetheretherketone, and polyimide. Among them, polyester resins such as polyethylene naphthalate are preferable from the viewpoint of heat resistance and workability.
  • Inorganic filler 500 Inorganic filler 500 sandwiched between first insulating resin layer 401 and second insulating resin layer 402 preferably has insulating properties, such as silica, alumina, talc, calcium carbonate, and boron nitride.
  • the inorganic filler 500 is a granular powder, and the particle size thereof is preferably 5 ⁇ m or less, more preferably less than 1 ⁇ m, as already described, from the viewpoint of insulation. Although the minimum particle size is not particularly limited, it is often 0.001 ⁇ m or more in terms of particle production.
  • the adhesive layers 601 and 602 are thermosetting resin containing a microcapsule-type foaming agent 600 .
  • thermosetting resins include epoxy resins, unsaturated polyester resins, vinyl ester resins, and urethane resins. From the viewpoint of heat resistance, epoxy resins, unsaturated polyester resins, and vinyl ester resins are preferred. Furthermore, silica, alumina, or the like may be added as a filler in order to increase heat resistance and strength.
  • Epoxy resins are not particularly limited, and include bisphenol type epoxy resins such as bisphenol A type, bisphenol F type, and dimer acid-modified bisphenol A type; novolac type epoxy resins such as phenol novolak type and cresol novolak type; resins, triphenylmethane-type epoxy resins, and the like. These epoxy resins may be used singly or in combination of two or more. Curing agents for epoxy resins include acid anhydrides, phenols, phenol novolacs, and dicyandiamides.
  • the unsaturated polyester resin is not particularly limited, and can be obtained by dissolving a condensate obtained from a dibasic acid and a polyhydric alcohol in a radically polymerizable monomer.
  • Dibasic acids used as raw materials for unsaturated polyester resins include ⁇ , ⁇ -unsaturated dibasic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, and itaconic anhydride, phthalic acid, and phthalic anhydride.
  • Polyhydric alcohols used as raw materials for unsaturated polyester resins 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 with propylene oxide or ethylene oxide, glycerin, trimethylolpropane, 1,3-propanediol, 1,2-cyclohexane glycol, 1,3-cyclohexane glycol, 1,4-cyclohexane Glycol, paraxylene glycol, bicyclohexyl-4,4'-diol, 2,6-decalin glycol, tris(2-hydroxyethyl)isocyanurate and the like can be used.
  • Aminoalcohols such as ethanolamine may also be used. Only one type of these polyhydric alcohols may be used, or two or more types may be mixed as appropriate. If necessary, a dicyclopentadiene compound may be incorporated into the resin skeleton.
  • a compound having at least two epoxy groups in the molecule is used as the epoxy compound used as a raw material for the vinyl ester resin.
  • 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 resins obtained by the condensation reaction of epihalohydrin with novolac which is a condensate of formalin
  • glycidyl ester-type epoxy resins obtained by the condensation reaction of tetrahydrophthalic acid, hexahydrophthalic acid and epihalohydrin Glycidyl ether type epoxy resins obtained by the condensation reaction of 4,4'-biphenol, 2,6-naphthalenediol, hydrogenated bisphenols or glycols with epihalohydrin
  • glycidyl ether type epoxy resins obtained by the condensation reaction of hydantoin or cyanuric acid with epihalohydrin An amine glycidyl ether type epoxy resin or the like can be used. However, it is not particularly limited to these compounds. These epoxy compounds may be used singly or in combination of two or more.
  • acrylic acid, methacrylic acid, crotonic acid, etc. can be used as the unsaturated monobasic acid used as a raw material for the vinyl ester resin.
  • Half esters such as maleic acid and itaconic acid may also be used.
  • unsaturated monobasic acids may be used singly or in combination of two or more.
  • any other component may be added to the resin composition described above, if necessary.
  • Optional components include, for example, radically polymerizable monomers, polymerization initiators, curing accelerators, polymerization inhibitors, adhesion improvers, and the like.
  • Radically polymerizable monomers include styrene, vinyltoluene, vinylnaphthalene, ⁇ -methylstyrene, vinylpyrrolidone, acrylamide, acrylonitrile, allyl alcohol, allylphenyl ether, (meth)acrylate, vinyl acetate, vinylpyrrolidone, (meth) ) acrylamide, maleic acid diester, fumaric acid diester and the like.
  • Styrene, vinyl toluene, and (meth)acrylic acid esters are preferably used.
  • (Meth)acrylic acid esters include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, 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-hydroxypropyl (meth) acrylate, 4-hydroxybuty
  • Polymerization initiators include benzoyl peroxide, lauroyl peroxide, t-butyl peroxide benzoate, t-amyl peroxide benzoate, t-amyl peroxyneodecanoate, t-butyl peroxyneodecanoate, t - amyl peroxyisobutyrate, di(t-butyl) peroxide, dicumyl peroxide, cumene hydroperoxide, 1,1-di(t-butylperoxy)cyclohexane, 2,2-di(t-butylperoxide) Oxy)butane, t-butyl hydroperoxide, di(s-butyl)peroxycarbonate, methyl ethyl ketone peroxide and the like can be used.
  • These compounds may be used singly or in combination of two or more.
  • compounds such as 1,1-di(t-butylperoxy)cyclohexane having a one-hour half-life temperature in the range of 100° C. to 150° C. are desirable.
  • Hardening accelerators include metal salts of naphthenic acid or octylic acid (metal salts of cobalt, zinc, zirconium, manganese, calcium, etc.). Only one type of these may be used, or two or more types may be mixed as appropriate.
  • polymerization inhibitors examples include quinones such as hydroquinone, para-tertiary butylcatechol, and pyrogallol. Only one type of these may be used, or two or more types may be mixed as appropriate.
  • Adhesion improvers include p-styryltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, and the like. Only one type of these may be used, or two or more types may be mixed as appropriate.
  • the microcapsule-type foaming agent 600 is not particularly limited, and may have a structure having a core-shell structure in which a volatile solvent is wrapped in an acrylic resin, for example.
  • Synthesis methods are not particularly limited, and interfacial polymerization methods, in-situ polymerization methods, and the like are applicable.
  • composition examples of the insulating members 300, 310, and 320 will be described below. Composition Examples 1 to 3 to which the present embodiment is applied, and Comparative Examples 1 to 2 for comparison with the present embodiment are shown, and effects of the insulating members 300, 310, and 320 to which the present embodiment is applied are shown. state.
  • an inorganic filler 500 having an average particle diameter of 0.05 ⁇ m was dispersed on a polyethylene naphthalate film having a thickness of 30 ⁇ m as the first insulating resin layer 401 , and then a 30 ⁇ m-thick polyethylene naphthalate film as the second insulating resin layer 402 was applied.
  • a polyethylene naphthalate film was placed on the upper surface and fused with a press.
  • polybutyl acrylate a polyamide nonwoven fabric having a thickness of 50 ⁇ m was adhered to the upper surface and the lower surface to form an insulating member.
  • Composition Example 2 is a polybutyl acrylate-coated polyimide film having a thickness of 30 ⁇ m, and an inorganic filler 500 having an average particle diameter of 0.05 ⁇ m is dispersed on the surface. was placed on the upper surface and adhered with a press. Furthermore, using polybutyl acrylate, a polyamide nonwoven fabric having a thickness of 50 ⁇ m was adhered to the upper surface and the lower surface to form an insulating member.
  • composition example 3 on both sides of composition example 1, 90 parts by weight of bisphenol A type epoxy resin JER1004 (manufactured by Mitsubishi Chemical) and 10 parts of polyfunctional acid anhydride Rikacid TMEG-S (manufactured by Shin Nippon Rika) are added as adhesive layers 601 and 602. Parts by weight and 10 parts by weight of thermally expandable microcapsules (manufactured by Kureha) were mixed and applied.
  • Comparative Examples 1 and 2 are examples in which the inorganic filler 500 is not provided between the first insulating resin layer 401 and the second insulating resin layer 402 .
  • Comparative Example 1 a polyethylene naphthalate film with a thickness of 30 ⁇ m was placed on the upper surface of the polyethylene naphthalate film with a thickness of 30 ⁇ m and fused with a press. Furthermore, using polybutyl acrylate, a polyamide nonwoven fabric having a thickness of 50 ⁇ m was adhered to the upper surface and the lower surface to form an insulating member.
  • Comparative Example 2 a polybutyl acrylate-coated 30- ⁇ m-thick polyimide film was placed on the surface of a 30- ⁇ m-thick polyimide film coated with polybutyl acrylate and adhered by pressing. Furthermore, using polybutyl acrylate, a polyamide nonwoven fabric having a thickness of 50 ⁇ m was adhered to the upper surface and the lower surface to form an insulating member.
  • the time to dielectric breakdown of the specimen using Composition Example 1 was 15 hours, the time to dielectric breakdown of the specimen using Composition Example 2 was 16.5 hours, and the dielectric breakdown of the specimen using Composition Example 3. was 14.5 hours.
  • the presence of the inorganic filler 500 improves the withstand voltage characteristics.
  • the insulating properties do not deteriorate even if an adhesive layer containing a foaming agent is laminated on the outermost layer side.
  • the stator 20 of the rotary electric machine 10 includes a stator core 21 in which slots 15 are formed, stator coils 60 accommodated in the slots 15, and insulating members arranged between the slots 15 and the stator coils 60.
  • Insulating members 300 , 310 , and 320 are composed of first insulating resin layer 401 , second insulating resin layer 402 laminated in the thickness direction of first insulating resin layer 401 , first insulating resin layer 401 and second insulating resin layer 401 .
  • an inorganic filler 500 made of granular powder dispersed between the resin layer 402 and the resin layer 402 .
  • the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention as long as the features of the present invention are not impaired. . Moreover, it is good also as a structure which combined the above-mentioned embodiment and several modifications.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

Ce stator d'une machine électrique rotative est pourvu : d'un noyau de stator dans lequel des fentes sont formées ; de bobines logées dans les fentes ; et d'éléments isolants disposés entre les fentes et les bobines. Les éléments isolants sont chacun pourvus : d'une première couche de résine isolante ; d'une seconde couche de résine isolante stratifiée dans la direction de l'épaisseur de la première couche de résine isolante ; et d'une charge organique constituée d'une poudre granulaire diffusée entre la première couche de résine isolante et la seconde couche de résine isolante.
PCT/JP2022/034094 2022-01-07 2022-09-12 Stator de machine électrique rotative WO2023132102A1 (fr)

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CN202280080716.XA CN118355587A (zh) 2022-01-07 2022-09-12 旋转电机的定子

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JP2022-001463 2022-01-07
JP2022001463A JP2023101093A (ja) 2022-01-07 2022-01-07 回転電機の固定子

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WO2023132102A1 true WO2023132102A1 (fr) 2023-07-13

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JP2020092597A (ja) * 2016-04-08 2020-06-11 日立化成株式会社 回転電機用コイル、回転電機用コイルの製造方法、マイカテープ、マイカテープの硬化物及び絶縁物
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