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WO2008145190A1 - Stratifié pour machines électriques - Google Patents

Stratifié pour machines électriques Download PDF

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Publication number
WO2008145190A1
WO2008145190A1 PCT/EP2007/055342 EP2007055342W WO2008145190A1 WO 2008145190 A1 WO2008145190 A1 WO 2008145190A1 EP 2007055342 W EP2007055342 W EP 2007055342W WO 2008145190 A1 WO2008145190 A1 WO 2008145190A1
Authority
WO
WIPO (PCT)
Prior art keywords
laminate
coating
substrate
expandable
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2007/055342
Other languages
English (en)
Inventor
Cherif Ghoul
Stéphane Schaal
Xavier Kornmann
Felix Greuter
Joerg Nelges
Harald Gieser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Research Ltd Switzerland
Original Assignee
ABB Research Ltd Switzerland
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Research Ltd Switzerland filed Critical ABB Research Ltd Switzerland
Priority to PCT/EP2007/055342 priority Critical patent/WO2008145190A1/fr
Publication of WO2008145190A1 publication Critical patent/WO2008145190A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation 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
    • H02K3/30—Windings characterised by the insulating material

Definitions

  • the present invention concerns a laminate for electrical machines, preferably for the insulation of conductors from the rotor or from the stator of an electrical machine.
  • Laminates are used in electrical machines in order to insulate conductors from the rotor or from the stator. Laminates are multi-layer structures and consist of several thin films laminated on top of each other. Nomex® paper (aramide fiber based sheet structure), polyethylene terephtalate film or other materials can compose the laminate individual layers.
  • Rotors and stators are mainly made of an assembly of coils and a stack of metallic sheets.
  • the sheets are shaped so that slots are formed when the sheets are stacked.
  • Laminates are laid into the slots and preformed conductor bundles consisting of insulated wires are put on top of the laminate.
  • the slots are then closed by another layer of laminates.
  • the stacks of sheets are usually not perfectly aligned and not perfectly cut, creating a micro -roughness on the surface of the rotor or the stator that can reach up to 500 microns or above. Thereby, a gap which prevents good thermal conductivity is formed between the conductors and the stack of sheets when laminates are applied against the rotor or the stator.
  • the coils of the rotor and of the stator are dried and impregnated with a curable varnish using e.g. the vacuum pressure impregnation (VPI) process in order to provide electrical insulation and mechanical strength.
  • the impregnation is performed by immersing the coils into a varnish (e.g. epoxy, polyurethane, phenolic, silicon, polyester etc.), applying vacuum to remove trapped air, and then applying pressure to ensure that every part of the coils is impregnated.
  • a varnish e.g. epoxy, polyurethane, phenolic, silicon, polyester etc.
  • applying vacuum to remove trapped air
  • pressure to ensure that every part of the coils is impregnated.
  • the gap caused by the micro -roughness cannot be filled because it is closed by the laminate (slot liner).
  • the coils are then cured, generally in a conventional oven, and the electrical machine is assembled.
  • the misalignment of the sheets composing the stack creates said micro-roughness. It leaves an air gap between the stack of sheets and the slot liner laminates. Air is a poor thermal conductor, impairing the heat dissipation capabilities of the machine. It could lead to overheating, loss of efficiency and shortened life-time of the complete system.
  • the air gap can be filled by applying manually a heat sink compound on the slot before installing the slot liner laminate. Nevertheless, this process is very labor intensive and costly.
  • Another alternative is to use an active cooling system such as water cooling. Again, such a system is expensive, consumes energy and creates reliability issues.
  • US 5,341,561 discloses a process for producing an electric insulation of electric machine windings.
  • the objective of this process is to provide a better mechanical fixation of the windings in the grooves in the laminate housing of the rotor or stator in which the windings are placed.
  • the grooves, into which the windings are to be laid are filled with a compressed or pre-stressed laminate.
  • the laminate itself is compressible, by containing an elastically compressible, highly elastic fiber material. The laminate is compressed when applied to the grooves.
  • One disadvantage of such a pre-tensioned layer is that the pre-tensioned material usually has the tendency to elastically decontract upon storage prior to installation e.g. by thermal influences.
  • One objective of the present invention is to provide a functional laminate structure, which allows a better coupling of the coils to the metallic stacks without introducing costly extra steps in the manufacturing.
  • the present invention solves the above problems by applying a heat expandable coating and/or impregnation layer to at least one side of the laminate, wherein said laminate preferably is a slot liner laminate between a stack of metallic sheets and conductor bundles of a rotor or stator.
  • Heat expandable coating compositions as such are well known in the state of the art in different fields.
  • a coating containing heat-expandable plastic material can be applied in a mixture with paint or varnish for providing a coating film which can be heated or baked.
  • Named compositions are substantially made of binder, a solvent vehicle and expandable resin beads, or a resin, methanol/ethanol and polystyrene (beads), or a sodium silicate solution and polystyrene beads.
  • this composition is used for coating an adherent, decorative film in order to achieve a pleasing and decorative finish of the surface structure.
  • the heat-expandable coating material described in JP 6240179 for the purpose of obtaining a fire-resistant and heat-resistant coating material is a mixture of a carbide containing a graphite-type substance with a substance containing one or more kinds of different metal elements composed mainly of metal salts, plus solvent adhesives and a thermally decomposable expandable foaming agent composed mainly of azodicarbonamide etc.
  • a laminate for the insulation of conductors of a rotor or stator of an electrical machine as for example a generator or motor, is provided, which comprises a substrate and a heat-expandable coating.
  • Said coating can be adhesive.
  • the coating is to be understood as either a coating, which is applied to the surface of the substrate, or as an impregnation layer, which can at least partially enter the substrate and/or be absorbed by it.
  • the term 'coating' is used for both options.
  • said laminate comprises a substrate that is not pre-tensioned, preferably not mechanically pre-tensioned, and preferably not elastically compressed either. That means, that the substrate is non compressed or pre- stressed in any other way before its application onto the surface of the slot.
  • the heat-expandable coating is not pre-tensioned/pre- stressed and preferably not elastically compressed either.
  • the coating is applied on one or both sides of the substrate.
  • the coating can be applied preferably to at least the side of the substrate facing the metal sheets and/or on both sides of the substrate.
  • the coating can be applied before or after application of the substrate to the slot. In the latter case, the coating might be injected into the slot and onto the substrate.
  • said coating comprises, as a matrix, a B-stage resin and at least one constituent having heat expandable properties.
  • the B-stage resin can be a phenolic-, epoxy-, silicone-, polyimide-, polysilazane-, cyanate-, cyanate ester-, polyester-, or polyurethane resin or any other suitable resin, preferably a thermosetting resin or a mixture thereof.
  • WO 2005/096320 A2 the contents of which shall be incorporated herein, discloses a wide array of resin types, including e.g. Novolak.
  • the B-stage is known as a secondary/intermediate stage in the reaction of a number of thermosetting resins, characterized by softening of the resin when heated and swelling when in the presence of certain liquids, but without complete fusing or dissolving.
  • the B-Stage also known as "resitol” or “resolite”, is also characterized by a progressive increase in viscosity; the resin portion of an uncured thermosetting adhesive/molding compound is usually in this stage.
  • the expansion capabilities can be achieved by adding one or several ingredients providing expandable properties to the coating.
  • the B-stage resin can also provide mechanical and/or dielectric strength to the laminate and/or the coating and/or give the laminate and/or the coating a specific shape.
  • the constituent having expandable properties is an expandable filler and/or a foaming agent (e.g. p-p-oxybisbenzenesulphonylhydrazine or any similar agent, etc.) and/or an expanding polymer or a mixture thereof.
  • the expanding polymers can be used either as additional additive or as the matrix of the coating.
  • the expanding properties of the constituent usually result from gas-formation and/or fluid vaporization and/or gas expansion and/or change in molecular structure and mostly are the result of carbon dioxide- and/or nitrogenous compounds and/or sulphurous compounds-release.
  • expandable filler agents are expandable micro fillers or nano fillers, preferably expandable nanospheres or expandable microspheres like Expancel® microspheres, Advancell® or an expandable graphite or a mixture thereof.
  • the gas- driven fillers like Expancel or Advancell, can be spherical or lens-shaped (uniaxially compressed) in their unexpanded state.
  • the expandable filler may also be some other filler with an expansion that can be triggered on demand. It can also be possible to trigger the expansion of such an expandable filler agent in some other way than by an increased temperature, e.g. chemically (water, solvent, acid, gas), electromagnetically (MW, IR, UV, VIS), mechanically, etc.
  • the expandable filler is unexpanded when added to the matrix of the coating and expanded at a later stage.
  • the Expancel fibre composite as described in US 6,864,297 is a foam composition comprising a fibrous material and microspheres, for the use in a wide range of engineering applications.
  • Microspheres in general can be selected from the group comprising a glass, a silica-alumina ceramic, an epoxy resin, an unsaturated polyester resin, a silicone resin, a phenolic, a polyvinyl alcohol, a polyvinyl chloride, a polypropylene, a polystyrene, a polyacrylonitrile, a polyamide, a polyacrylate and any combination thereof.
  • Expancel microspheres are small spherical plastic particles consisting of a polymer shell encapsulating a gas.
  • the shell can also encapsulate a fluid or a fluid-gas-combination.
  • the thermal expandable microsphere of Advancell contains a liquid hydrocarbon of low boiling point in a thermoplastic polymer cell.
  • the Advancell microsphere becomes a balloon with hollow inside by the heated expansion of the contained liquid hydrocarbon of low boiling point and simultaneously by the softening of the thermoplastic shell.
  • the balloons with hollow make a closed-cell structure.
  • the temperature to start expansion and the cell size, etc. can be optimized by selecting appropriate grades.
  • Another expandable filler is disclosed in WO 01/72399 as a component of an expanding glue for filters.
  • the coating further comprises at least one thermally conductive constituent.
  • This constituent preferably is of insulating, conducting or semi-conducting nature. It can contain particles of different morphologies and/or of different sizes.
  • the thermally conductive constituents may be added to the formulation in order to further increase the thermal conductivity of the laminate.
  • These fillers can be of insulating nature, like boron nitride, aluminium nitride, MgO, TiO 2 , (synthetic or natural) diamond, mica, Ba-sulphate, oxinitride or any other oxide/nitride/carbide.
  • It can also be of conducting or semiconducting nature, like carbon black, expandable graphite (which may be modified to low expansion temperatures) or metal flakes or particles, coated mica-platelets (see e.g. US 5,341,561), doped or undoped semi-conductors like SiC, ZnO, etc..
  • Semiconducting or conducting fillers add the additional function to electrically screen the voids produced in the expansion process and hence reduce the risk of increased partial discharge activity and electrical failure.
  • the filler can be of different morphology (equiaxed particles, fibres, flakes, etc.) and/or of different size (nanoparticles to several 10-100 microns, as well as mixtures thereof).
  • the laminate preferably the coating, can also contain an additive, preferably selected from the group comprising a catalyst, a latent hardener, an adhesion promotor, a coupling agent, a solid filler, a liquid metal filler, a flame retardant, a processing aid, a dispersion aid, or any other suitable additive, or combinations thereof.
  • an additive preferably selected from the group comprising a catalyst, a latent hardener, an adhesion promotor, a coupling agent, a solid filler, a liquid metal filler, a flame retardant, a processing aid, a dispersion aid, or any other suitable additive, or combinations thereof.
  • adhesion promotors or coupling agents can be used e.g. as a processing- and/or dispersion aid and/or for the improved adhesion of fillers and/or substrates and/or metal plates.
  • the laminate comprises more than one layer of substrate. If so, inside the laminates the adhesives used to bond the individual layers of substrate can be provided with fine (nano-type) fillers of good thermal (and/or conducting/semi-conducting) properties, in order to further reduce the thermal resistance of the base laminate.
  • the substrate comprises at least one foil or film, preferably metallic foil, more preferably Al or Cu foil, and/or mats- and/or felts made of glass, mineral or metal fibers, polyester, polypropylene, polyethylene, polyethylene terephtalate or aramide (e.g. Nomex® (available e.g. at DuPont Advanced Fibers Systems, Richmond, VA 23234, USA), etc.)).
  • Such an insulating film provides the mechanical and/or dielectric strength. If thin metal foils or metal mats, e.g. made of Al, are used, they can act as lateral heat spreaders.
  • the expanded coating has a thickness of 1-500 ⁇ m , preferably 10-250 ⁇ m, more preferably 80-150 ⁇ m.
  • the coating In an unexpanded state, the coating has a thickness of 1-300 ⁇ m, preferably 1-150 ⁇ m, more preferably 5-100 ⁇ m.
  • the purpose of the invention is also achieved by the use of said laminate for the filling, preferably void-free filling, of gaps and/or the impregnation between metal sheets and conductors in a rotor or stator of an electrical machine.
  • a method of producing said laminate wherein a heat-expandable coating is applied to at least one side of a substrate by applying a heat expandable coating and/or impregnation layer to at least one side of the laminate, wherein said laminate preferably is a slot liner laminate between a stack of metallic sheets and conductor bundles of a rotor or stator.
  • Another preferred embodiment of the invention is an electrical machine, e.g. a generator or motor, comprising a rotor and a stator, at least one of which has radially directed slots between metal sheet stacks and conductor bundles, which are axially extending in the slots.
  • Said rotor and/or stator have gaps between the metal sheet stacks and the conductor bundles, which are filled with one or more layers of the laminate according to one of the embodiments described above for the insulation of said conductor bundles.
  • At least one layer of laminate according to one of the embodiments of the present invention (laminate comprising a substrate and a heat- expandable coating) is provided among the layers.
  • the at least one layer of laminate according to the invention is provided on the side of the stack of laminates facing the metal sheets of the machine.
  • the purpose of the present invention is also achieved by providing a method for the void-free filling of gaps and/or the impregnation between metal sheets and conductors in a rotor or stator of an electrical machine.
  • at least one layer of the laminate according to any one of the embodiments described above is applied to the surface of the slot.
  • the slot liner laminate is applied onto the surface of the slot, into which the conductor bundles are to be laid, thereby covering the stack of metallic sheets of the rotor or stator before the conductor bundles are positioned.
  • several laminates could be stacked for higher thickness as well.
  • the conductors are positioned on said at least one layer of slot lining laminate and then covered by at least one layer of slot closure laminate.
  • A-stage an initial stage in the reaction of some thermosetting resins wherein the resin continues to be soluble and fusible.
  • A-stage is characterized by an initial lowering of viscosity and is also called "Resol”.
  • the C-stage is known as the third and final stage in the reaction of some thermosetting resins, characterized by the relatively insoluble and infusible state of the resin.
  • thermosetting resins in this stage are fully cured; also called “resite”. Therefore, when heat is applied to the rotor or the stator for drying, the coating of the slot liner laminate expands, closes the air gap with the slot and can form an adhesive bond with the sheets, the substrate, and/or the conductor.
  • the coating fully cures to C-stage and remains irreversibly in position. The expansion can be independent of the drying.
  • the coating is cured to B-stage for about 0.5-120 minutes, preferably about 5-60 minutes, more preferably about 30 minutes at about 30- 100 0 C, preferably about 50-90 0 C, more preferably about 80 0 C.
  • Curing to C-stage is carried out at about 60-240 0 C, preferably about 100-150 0 C, more preferably about 140 0 C for 5-240 minutes, preferably 10-180 minutes, more preferably about 60 minutes.
  • the advantages of the present invention are among others an improved heat dissipation of the electrical machine, providing a better efficiency, longer life-time and lower service temperature.
  • the preparation time and labor are also reduced because there is no need of applying manually any heatsink compound in order to overcome the micro- roughness issue, nor to use active cooling.
  • Existing automation techniques can be used.
  • Figure 1 shows an embodiment of the state of the art, representing a cut of a rotor slot perpendicular to the main axis of the machine
  • Figure 2 shows an embodiment of the state of the art, representing an axial cut of a rotor slot
  • Figure 3 represents a graph showing the coating thickness in microns, wherein the expanded thickness 11 is plotted against the non-expanded thickness 10.
  • Figure 4 schematic view of a layer of laminate 2 according to the present invention, representing an embodiment in which only one side of the substrate 7 has a heat-expandable coating applied to it;
  • Figure 5 represents an embodiment, in which both sides of the substrate 7 have a heat-expandable coating 6 applied to them.
  • FIG. 1 and 2 show a cut of a rotor slot perpendicular to the main axis of the machine (Fig. 1) and an axial cut (Fig. 2) of said rotor slot.
  • Rotors and stators are mainly made of an assembly of coils and a stack of metallic sheets 1. The sheets are shaped so that slots are formed when the sheets are stacked.
  • Laminates/slot liners 2 are laid into the slots and preformed conductor bundles 3 consisting of insulated wires are put on top of the laminate. The slots are then closed by another layer of laminates, the slot closure laminate layer 4.
  • the stacks of sheets are usually not perfectly aligned and not perfectly cut, as shown in the axial cut through a rotor slot in Fig. 2, creating a micro-roughness that can reach up to 500 microns (The surface of the rotor or the stator exhibits a micro -roughness that can reach 500 micrometers or above.). Thereby, a gap 5 which prevents good thermal conductivity is formed between the conductors 3 and the stack of sheets 1 when laminates are applied against the rotor or the stator.
  • the formulation of the coatings was as follows:
  • the slot liner laminate 2 is laid normally into position, followed by the conductors 3 and by the slot closure laminate 4, which is another layer of laminate, added to the conductors 3 after they have been positioned in the slots for insulation purposes.
  • Curing of the coatings 6 can take place in an oven or by any other way of heat application.
  • the temperature range for curing is 60-160 0 C.
  • the curing is carried in two steps. If curing is carried out in two steps, at the first step, A-stage coatings are cured until they reach B-stage, followed by a second step in which B-stage coatings are cured until they reach C-stage.
  • the curing in the first step is exercised at 30-100 0 C, preferably 50-90 0 C, more preferably about 80 0 C.
  • the curing in the second step is usually exercised at 60-240 0 C, preferably 100-150 0 C, more preferably about 140 0 C.
  • the first step of the curing is about 0.5-120 minutes, preferably 5-60 minutes, more preferably about 30 minutes in length, while the second step of the curing takes about 5-240 minutes, preferably 10-180 minutes, more preferably about 60 minutes in length.
  • the ranges depend on the type of matrix and filler chosen and therefore vary according to the composition chosen for the laminate and/or the coating.
  • the graph of figure 3 shows the expanded thickness 11 against the non-expanded thickness 10. It shows that the thicker the coating, the greater the expansion. Also, the increase is exponential in the chosen thickness range and in this particular example. For instance, a non expanded coating thickness of about 50 micron results in an expanded coating thickness of about 160 micron, according to the graph depicted. Coating thicknesses of about 10 micron to about 80 micron were tested. It is however possible, that smaller or larger amounts of coating 6 are applied to the substrate 7 and are useful as well.
  • Figures 4 and 5 show a schematic detailed view of a laminate 2.
  • Figure 4 exhibits a substrate 7 coated only on one side, e.g. on a first side 8 of the substrate 7.
  • the coating 6 can either be applied to the side 9 of the substrate 7 facing the metal sheets 1, or to the side 8 of the substrate 7 facing the conductor bundles 3.
  • the substrate 7 has a coating 6 applied both of its sides 8, 9. Therefore, the side 9 of the substrate 7 facing the metal sheets 1 is coated as well as the side 8 of the substrate facing upwards, toward the conductor bundles 3.

Landscapes

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

Abstract

La présente invention concerne un stratifié dont le substrat est revêtu d'une résine qui est capable de se dilater par chauffage, fermant l'espace entre le rotor ou le stator et les conducteurs, améliorant ainsi la dissipation thermique de la machine électrique.
PCT/EP2007/055342 2007-05-31 2007-05-31 Stratifié pour machines électriques Ceased WO2008145190A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/055342 WO2008145190A1 (fr) 2007-05-31 2007-05-31 Stratifié pour machines électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/055342 WO2008145190A1 (fr) 2007-05-31 2007-05-31 Stratifié pour machines électriques

Publications (1)

Publication Number Publication Date
WO2008145190A1 true WO2008145190A1 (fr) 2008-12-04

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2475076A1 (fr) 2011-01-05 2012-07-11 Alstom Technology Ltd Procédé de fabrication d'un stator et d'une barre de stator, stator et barre de stator
US9641037B2 (en) 2014-08-28 2017-05-02 General Electric Company Stator slot liners
US9667112B2 (en) 2014-08-28 2017-05-30 General Electric Company Rotor slot liners
US9879163B2 (en) 2014-06-06 2018-01-30 General Electric Company Composition for bonding windings or core laminates in an electrical machine, and associated method
US9911521B2 (en) 2014-06-06 2018-03-06 General Electric Company Curable composition for electrical machine, and associated method
EP3331132A1 (fr) * 2016-12-01 2018-06-06 Toyota Jidosha Kabushiki Kaisha Matériau isolant de bobine
US10971975B2 (en) 2016-12-14 2021-04-06 American Axle & Manufacturing, Inc. System and method for stator slot encapsulation using injected polymer
WO2022018151A1 (fr) * 2020-07-23 2022-01-27 Valeo Siemens Eautomotive Germany Gmbh Procédé de fabrication d'un produit intermédiaire pour une machine électrique, comprenant un paquet de stratifications de stator et une partie de boîtier du boîtier relié à celui-ci
DE102021115932A1 (de) 2021-06-21 2022-12-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Stator einer elektrischen Maschine und elektrische Maschine
CN115838511A (zh) * 2023-02-23 2023-03-24 四川大学 一种高压电缆半导电屏蔽料及其制备方法
WO2023162068A1 (fr) * 2022-02-24 2023-08-31 三菱電機株式会社 Vernis isolant de type feuille, procédé de fabrication associé, appareil électrique et machine électrique rotative
WO2024122623A1 (fr) * 2022-12-08 2024-06-13 日東シンコー株式会社 Feuille isolante

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US6864297B2 (en) * 2002-07-22 2005-03-08 University Of Southern California Composite foam made from polymer microspheres reinforced with long fibers
WO2005096320A2 (fr) * 2004-03-30 2005-10-13 General Electric Company Compositions thermo-conductrices et procedes de production desdites compositions

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US2862834A (en) * 1954-08-03 1958-12-02 Midland Chemcial Corp Method of coating an article with a heat expandable coating composition and coating composition therefor
WO1991004854A1 (fr) * 1989-09-28 1991-04-18 ISOVOLTA Österreichische Isolierstoffwerke Aktiengesellschaft Stratifie de plastique expansible a la chaleur, son procede de fabrication et son utilisation
EP0556844A2 (fr) * 1992-02-21 1993-08-25 Hercules Incorporated Composition d'organopolysiloxane résistante à la flamme, procédé pour leur préparation et article en cette matière
JPH06240179A (ja) * 1993-01-06 1994-08-30 Sadao Kumasaka 熱膨張性耐火被覆材
US6864297B2 (en) * 2002-07-22 2005-03-08 University Of Southern California Composite foam made from polymer microspheres reinforced with long fibers
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594044A (zh) * 2011-01-05 2012-07-18 阿尔斯通技术有限公司 定子和定子线棒以及制造定子和定子线棒的方法
EP2475076A1 (fr) 2011-01-05 2012-07-11 Alstom Technology Ltd Procédé de fabrication d'un stator et d'une barre de stator, stator et barre de stator
US9879163B2 (en) 2014-06-06 2018-01-30 General Electric Company Composition for bonding windings or core laminates in an electrical machine, and associated method
US9911521B2 (en) 2014-06-06 2018-03-06 General Electric Company Curable composition for electrical machine, and associated method
US9641037B2 (en) 2014-08-28 2017-05-02 General Electric Company Stator slot liners
US9667112B2 (en) 2014-08-28 2017-05-30 General Electric Company Rotor slot liners
EP3331132A1 (fr) * 2016-12-01 2018-06-06 Toyota Jidosha Kabushiki Kaisha Matériau isolant de bobine
US11316410B2 (en) 2016-12-14 2022-04-26 American Axle & Manufacturing, Inc. System and method for stator slot encapsulation using injected polymer
US10971975B2 (en) 2016-12-14 2021-04-06 American Axle & Manufacturing, Inc. System and method for stator slot encapsulation using injected polymer
WO2022018151A1 (fr) * 2020-07-23 2022-01-27 Valeo Siemens Eautomotive Germany Gmbh Procédé de fabrication d'un produit intermédiaire pour une machine électrique, comprenant un paquet de stratifications de stator et une partie de boîtier du boîtier relié à celui-ci
US12407229B2 (en) 2020-07-23 2025-09-02 Valeo Eautomotive Germany Gmbh Method for producing an intermediate product for an electrical machine, comprising a stator laminated core and a housing part, connected thereto, of the housing
DE102021115932A1 (de) 2021-06-21 2022-12-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Stator einer elektrischen Maschine und elektrische Maschine
US11990813B2 (en) 2021-06-21 2024-05-21 Dr. Ing. H. C. F. Porsche Ag Stator for an electrical machine and electrical machine
WO2023162068A1 (fr) * 2022-02-24 2023-08-31 三菱電機株式会社 Vernis isolant de type feuille, procédé de fabrication associé, appareil électrique et machine électrique rotative
WO2024122623A1 (fr) * 2022-12-08 2024-06-13 日東シンコー株式会社 Feuille isolante
CN115838511A (zh) * 2023-02-23 2023-03-24 四川大学 一种高压电缆半导电屏蔽料及其制备方法

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