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WO2024194294A1 - Procédé de production d'une chemise d'entrefer conçue pour une machine électrique - Google Patents

Procédé de production d'une chemise d'entrefer conçue pour une machine électrique Download PDF

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Publication number
WO2024194294A1
WO2024194294A1 PCT/EP2024/057260 EP2024057260W WO2024194294A1 WO 2024194294 A1 WO2024194294 A1 WO 2024194294A1 EP 2024057260 W EP2024057260 W EP 2024057260W WO 2024194294 A1 WO2024194294 A1 WO 2024194294A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
structural
structural layer
additional layer
electrical machine
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.)
Pending
Application number
PCT/EP2024/057260
Other languages
German (de)
English (en)
Inventor
Konrad Buettner
Ignacio Lobo Casanova
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO2024194294A1 publication Critical patent/WO2024194294A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs

Definitions

  • the invention relates to a method for producing a can for an electrical machine, in particular an electrical machine of a motor vehicle, which can be arranged or is arranged in a base body opening of a stator base body of the electrical machine, wherein the can is designed in a state mounted in the base body opening to separate a stator space and a rotor space of the electrical machine, wherein at least one structural layer having a plurality of structural elements, in particular a scrim or a fabric, is provided, the structural elements of which are connected to at least one connecting element, in particular a sewing thread, wherein the at least one structural layer is arranged on a core and is impregnated with a matrix material and cured.
  • Such cans are arranged in the electrical machine in a base body opening of a stator base body, so that they spatially separate a rotor space of the electrical machine, in which the rotor is rotatably mounted, from a stator space in which the stator base body is arranged.
  • the separation ensures that different fluids, for example oil, cannot mix with one another in the stator space and in the rotor space, and in particular that a liquid from one of the spaces cannot penetrate into the other space.
  • RTM process resin transfer molding
  • a so-called “RTM process” resin transfer molding
  • one or more structural layers for example layers of a fabric or a scrim
  • a matrix material in particular a resin
  • the structural layers described are placed on a core, which core ultimately defines the inner radius or the inner surface of the split tube.
  • they are connected to each other by means of connecting elements, in particular sewing threads.
  • Such sewing threads can in particular be made from a thermoplastic material.
  • the matrix material behaves differently in the area of the sewing threads than in the area of the structural elements of the structural layer.
  • the connection between the matrix material and the sewing thread can be weakened or completely lost, for example due to a lack of adhesion, shrinkage or different thermal expansion of the sewing threads, which can lead to channels or channel sections forming along the sewing threads. Since the sewing threads extend through the structural layer at different points, in the worst case it is possible that the individual channels formed by the detachment between the matrix material and the sewing thread connect, so that a conductive connection between the outside of the split tube and the inside of the split tube cannot be reliably prevented.
  • the invention is based on the object of specifying an improved method for producing a can for an electrical machine, in which weakening of the can due to connecting elements is prevented.
  • the invention relates to a method for producing a can for an electrical machine, in particular an electrical machine of a Motor vehicle.
  • the gap tube can then be introduced into a base body opening of a stator base body of the electrical machine or arranged there in order to form an assembly for the electrical machine.
  • the gap tube In the assembled state in which the gap tube is arranged in the base body opening, the gap tube separates the stator space from the rotor space of the electrical machine.
  • the structure of the split tube provides at least one structural layer that provides several structural elements, for example fiber elements in the manner of a fabric or a scrim.
  • the individual structural elements can be, for example, threads or strands or individual fiber elements, for example aramid fiber elements or glass fiber elements or any other fibers.
  • the individual structural elements are connected with at least one connecting element, for example sewn together with a sewing thread.
  • the at least one structural layer is arranged on a core.
  • the core can be, for example, a cylindrical metal body.
  • the structural layer arranged on the core is then impregnated with a matrix material, for example a resin, and then cured, in particular under the influence of temperature.
  • the invention is based on the finding that at least one additional layer, different from the at least one structural layer, is arranged on the at least one structural layer and cured together with the structural layer.
  • the method described here proposes at least one additional layer that is different from the structural layer.
  • the structural layer can, for example, be surrounded by the additional layer radially inward or radially outward, so that the additional layer forms the surface of the can. This can prevent the connecting elements from forming "channels" within the structural layer and thus impairing the tightness of the can.
  • the additional layer can be used to form the described channels within the structural layer. to provide a closed layer through which the liquid that may enter the channels within the structural layer cannot pass.
  • the structural layer can also be understood as a fiber layer, for example as a scrim or fabric that is impregnated with the matrix material, in particular with a resin.
  • the matrix material is then hardened by tempering or implementing a defined temperature profile, so that the split tube is created.
  • the split tube can then be demolded from the core in a manner known per se and inserted into the base body opening.
  • the effects resulting from the different behavior of the matrix material on the structural elements and on the connecting element can also occur in the structural layer.
  • the additional layer described ensures that liquid can enter the structural layer but cannot pass through the additional layer because the channels described do not form in the additional layer. Because the additional layer is arranged on the structural layer, for example radially inward or radially outward, even if the structural layer is weakened and liquid enters it, the liquid cannot penetrate from the stator space into the rotor space or vice versa because this is blocked by the additional layer.
  • the additional layer is different from the structural layer, so that the method described here is already distinguished from methods in which several structural layers are placed on top of one another.
  • the at least one additional layer is pre-impregnated.
  • Pre-impregnation can be understood in particular as a so-called “prepreg” layer or a so-called “prepreg” body can be used as an additional layer.
  • Pre-impregnation is to be understood in particular as meaning that the matrix material is already introduced into the additional layer when the additional layer is handled, in particular when it is applied to the core.
  • the structural elements within the additional layer can already be impregnated with the matrix material when the additional layer is wound up.
  • the additional layer is already pre-impregnated, ie impregnated with the matrix material, and arranged on the structural layer.
  • the additional layer During subsequent processing, in particular the impregnation of the structural layer with the matrix material, the additional layer ultimately remains unchanged because it is already impregnated with matrix material.
  • the additional layer therefore behaves like a barrier for the matrix material introduced into the structural layer, which is described in more detail below.
  • a barrier is also created in the produced can, since the disadvantages of the connecting elements arranged in the structural layer do not arise in the additional layer.
  • the additional layer can thus additionally seal the structural layer.
  • the additional layer can, for example, be handled in such a way that the matrix material within the additional layer does not harden during application to the core.
  • the additional layer can, for example, be processed cooled or at room temperature.
  • the matrix material of the additional layer also cures, so that the can made up of the at least one additional layer and the at least one structural layer is cured together.
  • a layer different from a structural layer can be used as an additional layer.
  • the additional layer can be designed as a pre-impregnated additional layer, as described.
  • the at least one additional layer can be free of connecting elements, in particular sewing threads.
  • the additional layer can have sufficient structure to be handled due to its pre-impregnation.
  • the structural layer is made handleable by the individual structural elements, for example fiber elements, being Connecting elements, in particular sewing threads, are connected to one another. The structural elements are therefore necessary for the formation of the structural layers in order to be able to handle the structural layers in the RTM process.
  • the additional layer can be designed free of connecting elements, in particular free of sewing threads, since this is already manageable in itself, for example due to the pre-impregnation. This ensures in particular that the described sewing threads do not have to be arranged in the additional layer and thus a channel formation as previously described does not occur in the additional layer. Since the additional layer is arranged on the structural layer and can thus be kept free of connecting elements and thus also free of weakenings, the additional layer can serve as a barrier, which is arranged, for example, radially inward or radially outward on the at least one structural layer. If weakenings occur in the structural layer, the liquid can enter the structural layer from the stator space or the rotor space, but cannot pass through the at least one additional layer.
  • any number and arrangement of structural layers and additional layers can be realized.
  • at least one additional layer is arranged radially within the at least one structural layer.
  • the additional layer can, for example, be applied directly to the core and structural layers can then be attached radially above it, for example wound onto the at least one additional layer.
  • the additional layers cannot in principle be manufactured with the required tolerances, which can, however, be achieved in the RTM process by the structural layers, it can be advantageous to apply the additional layer directly to the core, since the core, for example as a metallic solid, is sufficiently dimensionally stable and forms a uniform and dimensionally stable inner surface on the additional layer in the subsequent RTM process.
  • the structural layers and impregnating the structural layers with the matrix material under pressure on the side opposite the core in the radial direction External tool an equally high quality can be achieved on the outer surface of the split tube.
  • the at least one additional layer is arranged radially outside the at least one structural layer.
  • the additional layer it is possible to first arrange a structural layer on the core and then arrange the at least one, in particular pre-impregnated, additional layer on the structural layer.
  • any combination is possible, or any layer structure of additional layers and structural layers.
  • the additional layer forms the outer surface of the can.
  • the additional layer comes into contact with the inner surface of the outer tool and, when the matrix material is introduced into the structural layer arranged radially inside the additional layer, is guided outwards against the outer tool by the pressure with which the matrix material is fed into the tool, so that the dimensional accuracy and surface quality of the can can be maintained both internally by the pressure and the surface of the core and externally by the additional layer being in contact with the inner surface of the outer tool.
  • the method can further provide that the at least one additional layer is shorter in the axial direction than the at least one structural layer.
  • the at least one structural layer on the core and to arrange the additional layer on the structural layer or on the structural layer that is furthest out in the radial direction.
  • the dimensions of the individual layers in the axial direction can be selected differently.
  • the additional layer can be shorter in the axial direction, ie along the longitudinal axis of the core, than the at least one structural layer or than all structural layers. This ensures in particular that the structural layer in the tool can be impregnated with the matrix material, in particular a sprue area can be created in which the matrix material can be introduced into the structural layer from radially outside.
  • a channel can then form within the structural layer in which the matrix material below the additional layer within the structural layer can impregnate the structural layer.
  • the additional layer acts as a "barrier" for the matrix material, since the additional layer is already impregnated with matrix material and does not absorb any more matrix material.
  • the matrix material can undermine the additional layer in the described embodiment and impregnate the structural layer, but it can also penetrate between the additional layer and the tool and thus envelop the additional layer.
  • the overhang in the structural layer formed by the longer formation of the structural layer in the axial direction compared to the additional layer can subsequently be removed or used as a process surface, for example for applying a sealing device to the can.
  • the method can further be developed in such a way that the at least one additional layer surrounds the at least one structural layer on its inner circumference and/or outer circumference.
  • the additional layer can form a layer that is closed in the circumferential direction, so that no liquid can pass through the additional layer.
  • the additional layer thus encloses the entire circumference of the structural layer, for example on its inner circumference and/or outer circumference.
  • the invention further relates to a method for producing an assembly for an electrical machine, in particular an electrical machine of a motor vehicle, which assembly has a stator base body and a can that can be arranged in a base body opening of the stator base body and is designed to form a stator space and a Rotor space of the assembly, wherein the can has at least one structural layer having a plurality of structural elements, in particular a scrim or a fabric, the structural elements of which are connected to at least one connecting element, in particular a sewing thread, wherein at least one additional layer different from the at least one structural layer is arranged on the at least one structural layer and cured together with the structural layer and the can is introduced into the base body opening.
  • the invention also relates to an assembly for an electrical machine, in particular an electrical machine of a motor vehicle, which assembly has a stator base body and a can that is arranged in a base body opening of the stator base body and is designed to separate a stator space and a rotor space of the assembly, wherein the can has at least one structural layer that has several structural elements, in particular a scrim or a fabric, the structural elements of which are connected to at least one connecting element, in particular a sewing thread, wherein at least one additional layer that is different from the at least one structural layer is arranged on the at least one structural layer and is cured together with the structural layer.
  • the invention also relates to an electrical machine that comprises such an assembly.
  • the invention also relates to a motor vehicle comprising a described electrical machine and/or a described assembly.
  • Fig. 1 is a schematic representation of a section of a split tube in sectional view
  • Fig. 2 is a schematic representation of a winding process for producing a can according to a first embodiment
  • Fig. 3 is a schematic representation of a process step for producing a split tube using a tool in an axial sectional view
  • Fig. 4 is a further schematic representation of the process step for producing a split tube using the tool of Fig. 3 in a front view.
  • Fig. 1 shows a schematic representation of a section of a can 1 for an electrical machine (not shown in detail).
  • the electrical machine can be, for example, a traction drive for a motor vehicle.
  • the can 1 is introduced into a base body opening in the electrical machine and is connected there to the inner circumference of the base body opening, for example glued, thus separating a rotor space from a stator space of the electrical machine.
  • the use of such cans 1 is basically known and will therefore not be described further.
  • the split tube 1 shown in Fig. 1 has, merely as an example, a structural layer 2 in which several structural elements 3, in particular glass fibers or aramid fibers, are arranged, for example in the manner of a woven or laid fabric.
  • the individual structural elements 3 are connected to one another with connecting elements 4.
  • the connecting elements 4 are, for example, sewing threads, in particular made of a thermoplastic.
  • the connecting elements 4 are arranged, for example, alternately on the top and bottom of the structural layer 2 and connect or sew the individual structural elements 3 together. Since the connecting elements 4, for example thermoplastic threads, are different from the structural elements 3, for example glass fibers or aramid fibers, they behave differently in a matrix material 5, for example a resin with which the structural layer 2 is impregnated. than the structural elements 3. For example, detachment of the matrix material 5 in the region of the connecting elements 4 may occur due to shrinkage, adhesion or different thermal expansion coefficients.
  • the split tube 1 has an additional layer 6, which in this embodiment is arranged on the outer circumference of the structural layer 2.
  • the embodiment is to be understood as merely an example, whereby any number of structural layers 2 can be combined with any number of additional layers 6, which additional layer 6 can also be arranged radially inward on a structural layer 2.
  • the additional layer 6 differs from the structural layer 2 in that it is already pre-impregnated when it is fed into the process. This means that the additional layer 6 already has structural elements 7 that are arranged in a matrix material 8 or are impregnated with it. As a result, it is not necessary to use connecting elements in the additional layer 6, but the additional layer 6 is free of connecting elements, in particular sewing threads.
  • At least one structural layer 2 and at least one additional layer 6 are provided, wherein the additional layer 6 is already pre-impregnated and the structural layer 2 is impregnated with a matrix material 5 in the production process, in particular by an RTM process, wherein the matrix material 5 is then cured together with the matrix material 8 of the additional layer 6, in particular by defined tempering.
  • Fig. 2 shows an example of a sequence in which the individual layers can be wound onto a circular cylindrical core 9 (see Fig. 3, 4).
  • An arrow 10 in Fig. 2 shows the rolling direction of the core 9 on the respective layers 2, 6.
  • the additional layer 6 is used as the first layer in Fig. 2, starting from the right, and is first wound or rolled onto the core 9. Then, for example, two structural layers 2 are rolled onto the additional layer 6 rolled onto the core 9.
  • the winding direction or the rolling direction or the sequence of the individual layers can be changed as desired. It is also possible to roll or wind the additional layer 6 as the first layer onto the core 9.
  • the number of individual layers can be changed as desired, so that at least one structural layer 2 and at least one additional layer 6 are used.
  • Fig. 3 shows a schematic representation of a process step for producing the can 1.
  • the core 9, which can be heated if necessary forms an inner tool.
  • An outer tool 11 which surrounds the core 9 and can also be heated if necessary is hidden here and shown in Fig. 4.
  • the at least one structural layer 2 and the at least one additional layer 6 are rolled or wound onto the core 9 and then introduced into the tool.
  • Liquid matrix material 5 is introduced via a sprue area 12 and a sprue channel 13 into a cavity formed between the inner tool or the core 9 and the outer tool 11, which impregnates the structural layer 2.
  • the additional layer 6 optionally has a shorter extension in the axial direction, for example in relation to a longitudinal axis of the core 9, than the at least one structural layer 2.
  • the matrix material 5 introduced into the tool can soak through the structural layer 2 in the sprue area 12, so that the matrix material 5 can extend through the structural layer 2 within the structural layer 2 and thus between the additional layer 6 and the surface of the core 9, like a channel.
  • the additional layer 6 acts as a barrier for the matrix material 5, since the additional layer 6 is already saturated by the pre-impregnated matrix material 8. In principle, it is therefore possible for the matrix material 5 to be guided radially within the additional layer 6 and/or for the additional layer 6 to encircle radially outside.
  • the matrix material 5, 8 can be hardened together by tempering.
  • the can 1 can then be demolded from the core 9 in a manner known per se and introduced into the base body opening of an electrical machine.
  • Fig. 4 shows the previously described tool 9, 11, in contrast to Fig. 3, viewed along the longitudinal axis of the core 9, so that the longitudinal axis is aligned out of or into the plane of the drawing.
  • the additional layer 6 in this embodiment is arranged directly on the core 9, with at least one structural layer 2 being applied to the additional layer 6, for example after the winding process shown in Fig. 2.
  • the core 9, which is, for example, a metallic cylinder made of solid material, provides sufficient stability for the additional layer 6 to be sufficiently dimensionally stable on its inner surface and to have the required surface quality.
  • the additional layer 6 is, as described, pre-impregnated and is wrapped by the at least one structural layer 2, which can be designed as a "dry" fabric or woven material. Then, as already described, the casting takes place so that matrix material 5 is introduced into the tool.
  • the matrix material 5 can impregnate the structural layer 2. Sufficient pressure in turn ensures that the structural layer 2 is sufficiently impregnated.
  • the can 1 is produced by subsequent tempering, with the matrix material 5 in the structural layer 2 and the matrix material 8 in the additional layer 6 hardening together.
  • the additional layer 6 surrounds the structural layer 2 over its entire circumference or the additional layer 6 lies against the entire inner circumference of the structural layer 2.
  • the additional layer 6 forms a barrier that is closed in the circumferential direction, so that liquids, even if they can enter the structural layer 2, cannot pass through the additional layer 6.
  • several layers of structural layers 2 and/or additional layers 6 can be used.
  • the advantages, details and features shown in the individual embodiments can be combined with one another as desired, are interchangeable and transferable to one another.
  • the method described here can be used in particular to form an assembly for an electrical machine, namely by introducing the can produced using the described method into a base body opening of a stator base body of an electrical machine.
  • the method described here can also be applied in particular to a method for producing such an assembly.
  • the assembly can then be used for an electrical machine, which can be part of a motor vehicle, for example.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne un procédé pour produire une chemise d'entrefer (1) conçue pour une machine électrique, en particulier une machine électrique d'un véhicule automobile, ladite chemise d'entrefer (1) pouvant être disposée ou étant disposée dans une ouverture de corps de base d'un corps de base de stator de la machine électrique, la chemise d'entrefer (1) étant conçue, lorsqu'elle est à l'état monté dans l'ouverture de corps de base, pour séparer un espace de stator et un espace de rotor de la machine électrique, au moins une couche de structure (2) présentant plusieurs éléments de structure (3), en particulier une nappe ou un tissu, dont les éléments structurels (3) sont reliés à au moins un élément de liaison (4), en particulier un fil de couture, étant préparée, la ou les couches de structure (2) étant disposées sur un noyau (9) et imprégnées d'un matériau de matrice (5) et durcies, au moins une couche supplémentaire (6) différente de la ou des couches de structure (2) étant disposée sur la ou les couches de structure (2) et durcie conjointement avec la couche de structure (2).
PCT/EP2024/057260 2023-03-23 2024-03-19 Procédé de production d'une chemise d'entrefer conçue pour une machine électrique Pending WO2024194294A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023202607.4A DE102023202607A1 (de) 2023-03-23 2023-03-23 Verfahren zur Herstellung eines Spaltrohrs für eine elektrische Maschine
DE102023202607.4 2023-03-23

Publications (1)

Publication Number Publication Date
WO2024194294A1 true WO2024194294A1 (fr) 2024-09-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/057260 Pending WO2024194294A1 (fr) 2023-03-23 2024-03-19 Procédé de production d'une chemise d'entrefer conçue pour une machine électrique

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Country Link
DE (1) DE102023202607A1 (fr)
WO (1) WO2024194294A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001231213A (ja) * 2000-02-14 2001-08-24 Nikkiso Co Ltd キャンドモータにおけるキャン及びその製造方法
JP2004289966A (ja) * 2003-03-24 2004-10-14 Mayekawa Mfg Co Ltd アンモニアキャンドモータ用積層キャンの構造及びその加工法
DE102018206787A1 (de) * 2018-02-13 2019-08-14 Siemens Aktiengesellschaft Spaltrohr für eine elektrische Maschine aus einem Faserverbundwerkstoff, elektrische Maschine sowie Herstellungsverfahren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001231213A (ja) * 2000-02-14 2001-08-24 Nikkiso Co Ltd キャンドモータにおけるキャン及びその製造方法
JP2004289966A (ja) * 2003-03-24 2004-10-14 Mayekawa Mfg Co Ltd アンモニアキャンドモータ用積層キャンの構造及びその加工法
DE102018206787A1 (de) * 2018-02-13 2019-08-14 Siemens Aktiengesellschaft Spaltrohr für eine elektrische Maschine aus einem Faserverbundwerkstoff, elektrische Maschine sowie Herstellungsverfahren

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