WO2018188945A1 - Stator pour une machine électrique et procédé de fabrication d'un stator d'une machine électrique - Google Patents

Stator pour une machine électrique et procédé de fabrication d'un stator d'une machine électrique Download PDF

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Publication number
WO2018188945A1
WO2018188945A1 PCT/EP2018/057794 EP2018057794W WO2018188945A1 WO 2018188945 A1 WO2018188945 A1 WO 2018188945A1 EP 2018057794 W EP2018057794 W EP 2018057794W WO 2018188945 A1 WO2018188945 A1 WO 2018188945A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor elements
stator
insulating material
conductor
elements
Prior art date
Application number
PCT/EP2018/057794
Other languages
German (de)
English (en)
Inventor
Fabian Lange
Patrick PRIEBE
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018188945A1 publication Critical patent/WO2018188945A1/fr

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
    • H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto

Definitions

  • the invention relates to a stator for an electrical machine and to a method for producing a stator of an electrical machine.
  • the inserted and covered with an electrically insulating paint conductor elements must be connected together to produce the overall winding.
  • the conductor elements are hereby usually partly, in particular in pairs, welded together, e.g. by laser welding.
  • the ends of the conductor elements usually have to be freed of the varnish, so that during welding no inclusions are formed in the weld due to outgassing of the varnish. After welding, the welded together ends of the conductor elements are thus free of paint.
  • high demands are placed on the power density of the electrical machine or the stator. Therefore, to ensure the insulation strength or dielectric strength, an insulating material must be applied to the lacquer-free ends of the conductor elements. This is especially true when the electric machine is to be operated with the stator in an oil environment.
  • a high capillary pressure on the liquid / liquefied insulation material acts locally on the conductor elements or the sharp edges, which "pushes" the insulation material away from the edges, resulting in a smaller thickness of the insulation material in the area of the insulation material Edges or the ends of the conductor elements.
  • the insulating material often has a thinner compared to the other areas of the conductor element thickness. With a smaller thickness of the insulating material, the insulation strength of the conductor element decreases.
  • Embodiments of the present invention may advantageously make it possible to provide a stator in which insulating material is uniformly present on ends of the conductor elements, or insulation material on ends of the conductor elements
  • a stator for an electrical machine comprising conductor elements inserted into the stator, wherein ends of the conductor elements protruding from the stator are partially, in particular in pairs, welded together, characterized by a bridge means for increasing a thickness of an electrical insulation material the ends of the conductor members, the bridging means being disposed at end faces of the ends of the conductor members spaced apart a predetermined distance from the respective ends of the conductor members, the gap between the ends of the conductor members and the bridging means being bridged by the insulating material to be, wherein the bridging means comprises a part of the conductor element or a separate element.
  • Conductor elements is arranged uniformly or with substantially the same thickness. This also typically applies if the edges of the ends of the conductor elements have low radii or are sharp-edged. As a result, material is generally saved. This usually reduces costs.
  • the stator is typically designed to save space and space. The stator can also be operated in an oil environment usually. According to a second aspect of the invention, a method is proposed for producing a stator of an electrical machine, the method comprising the following steps: providing non-interconnected conductor elements inserted into the stator, wherein the ends protruding from at least the stator
  • Ladder elements are painted with a lacquer; Removing the paint from each at least a portion of the projecting from the stator ends of the conductor elements; Welding, in particular laser welding, of the parts freed of the paint from in each case two or more directly mutually adjacent conductor elements for the electrical connection of the two or more directly mutually adjacent conductor elements; Applying a liquid / liquefied insulating material for electrical insulation to the previously unpainted ends of the conductor elements while each bridging means is at a distance from the welded ends of the conductor elements such that the liquid / liquefied insulating material bonds between the respective ends welded together the conductor elements and the bridge means forms; and curing the insulation material.
  • the advantage of this is that the insulating material is typically applied evenly or with substantially the same thickness to the ends of the conductor elements. This usually takes place even when the ends of the conductor elements sharp edges or
  • the insulating material encloses respective ends of the conductor elements, wherein the ends enclosed by the respective insulation material are welded together. In each pair welded together ends of conductor elements, the insulating material thus encloses a pair of welded together ends of
  • the gap is equal to or less than one half of a diameter of the respective end of the conductor element.
  • This is usually the Insulation material arranged evenly on the ends of the conductor elements.
  • this typically typically ensures that the insulation material bridges the gap.
  • the bridging means is part of a ring, which is arranged in the axial direction of the stator above the respective ends of the conductor elements.
  • the bridging means can generally be embodied in a technically particularly simple and cost-effective manner. This usually reduces the manufacturing cost of the stator.
  • the insulating material of the respective welded ends of the conductor elements at a distance from the insulating material of the immediately adjacent welded together ends of the conductor elements.
  • One advantage of this is that typically there are no insulating material bridges between the insulating materials of immediately adjacent ends of the conductor elements. By insulating material bridges, the electrical insulation between non-welded ends of conductor elements could be lowered. Thus, typically, the lack of insulation material bridges between insulating materials of immediately adjacent ends of the conductor elements increases the insulation strength of the stator.
  • the ends of the conductor elements each have one or more sharp edges.
  • the stator, in particular the conductor elements is usually technically particularly easy to produce. This typically further reduces manufacturing costs.
  • the bridge means is in an imaginary direct extension of the ends of the conductor elements.
  • the advantage of this is that the bridge of insulating material, which bridges the gap, typically consists of very little material or requires very little material. This generally reduces costs further.
  • the side of the additional element or of the additional elements facing the ends of the conductor elements has a surface which attracts the liquid insulating material.
  • the insulation material is applied such that the insulation material of the respective welded ends of the conductor elements after applying and curing of the insulating material further comprises a distance to the insulating material of the immediately adjacent welded together ends of the conductor elements.
  • Insulation material bridges could be the electrical insulation between not welded together ends of conductor elements are lowered.
  • Insulation strength of the manufactured stator increases.
  • the bridging means is at a distance from the ends of the conductor elements which are welded together and which is equal to or less than one half of a diameter of the respective end of the conductor element.
  • the insulating material is applied even more uniformly on the ends of the conductor elements usually.
  • this typically typically ensures that the insulation material bridges the gap.
  • FIG. 1 shows a perspective view of an embodiment of the stator
  • Fig. 2 is a detailed perspective view of a portion of the stator of Fig. 1;
  • FIG. 3 shows a schematic cross-sectional view of a pair of ends of FIG
  • FIG. 4 shows another schematic cross-sectional view of a pair of ends of FIG
  • Fig. 1 shows a perspective view of an embodiment of the stator 10.
  • Fig. 2 shows a detailed perspective view of a portion of the stator 10 of Fig. 1.
  • the stator 10 is formed for an electric machine.
  • the stator 10 is designed in particular for a vehicle.
  • the stator 10 is formed in plug-in technology.
  • the electrical conductor elements 20, 21 are inserted into the stator 10. Ends 48 of the electrical
  • Conductor elements 20, 21 project out of the stator 10 upwards.
  • the electrical conductors are uniformly spaced from one another along the circumference of the stator 10.
  • On the bottom are also ends 48 of the conductor elements 20, 21 out of the stator 10 out. This is not shown in the drawings.
  • the conductor elements 20, 21 have at their ends 48 sharp edges 70, 75. These are due to the separation process (e.g., shearing of the conductor element 20, 21).
  • the edges 70, 75 thus have small edge radii.
  • Liquefied insulation material 50 in the edge area is calculated as follows: in which ⁇ the surface tension of the liquid insulating material 50, and
  • r is the edge radius.
  • the electrical conductors are provided with a lacquer for electrically insulating the conductor elements 20, 21.
  • the paint is not shown in the drawings.
  • the ends 48 of the conductor elements 20, 21 or areas thereof are freed from the paint.
  • the ends 48 of the conductor elements 20, 21 comprise at least the end edges 70, 75 of the respective conductor element 20, 21 and a portion of the conductor element 20, 21 immediately adjacent the end edges 70, 75.
  • the ends 48 of the conductor elements 20, 21 may, but need not, the complete projecting from the stator 10 part of the conductor elements 20, 21 each comprise.
  • the ends 48 of the conductor elements 20, 21 are welded together in pairs. It is also conceivable that three or more than three ends 48 of conductor elements 20, 21 are each welded together. It is also spoken by pairs 40-45 of ends 48 of conductor elements 20, 21 welded together. By this term, however, more than two ends 48 of conductor elements 20, 21, e.g. three or four ends of conductor elements 20, 21, which are welded together comprises.
  • the welding may in particular include or be a laser welding.
  • the insulation material 50 is applied in particular to the ends 48 of the conductor elements 20, 21 in such a way that all areas of the conductor elements 20, 21 or the ends 48 of the conductor elements 20, 21 previously freed of lacquer are provided with insulation material 50, so that the respective entire Conductor element 20, 21 is electrically isolated from the environment.
  • the Insulation material 50 thus encloses respective ends 48 of conductor elements 20, 21, which are welded together.
  • a bridging means 60 is arranged in the vicinity of the ends 48 of the conductor elements 20, 21. Between the ends 48 and end edges 70, 75 of the respective conductor elements 20, 21 and the pairs 40-45 of ends 48 of the conductor elements 20, 21 and the bridge means 60, a gap or a distance is arranged. The distance or gap may be equal to or less than one half of a
  • Diameter of the respective end 48 of the conductor element 20, 21 be.
  • the gap is selected such that upon application of the insulating material 50, the liquid or liquefied insulating material 50 forms a bridge between the respective end 48 of the conductor element 20, 21 and the bridge means 60.
  • the bridging means 60 may e.g. comprise a ring or be a ring.
  • the ring may be formed of a plastic.
  • the ring may in particular be made of a low-cost material.
  • the material of the bridge means 60 is electrically non-conductive.
  • a plurality of individual bridge means 60 are conceivable which are each arranged at a distance from the ends 48 of the conductor elements 20, 21.
  • the insulating material 50 forms a bridge between the respective ends 48 of FIG.
  • Conductor elements 20, 21 or the respective pairs 40-45 of ends 48 of the conductor elements 20, 21 and the bridge means 60 This results in a uniform thickness of the applied insulating material 50 in the areas of the conductor elements 20, 21, of the ends 48 and end edges 70, 75 are spaced, and in the end regions or at the ends 48 / end edges 70, 75 of the conductor elements 20, 21 achieved.
  • the capillary pressure of the liquid insulating material 50 at the ends 48 of the conductor members 20, 21 is thus similar or equal to the capillary pressure of the liquid insulating material 50 spaced from the ends 48 of the conductor members 20, 21 and the end edges 70, respectively. 75 of the ends 48 of the conductor elements 20, 21 is.
  • the insulating material 50 is cured. This can be done for example by light and / or heat.
  • the bridge means 60 usually remains on the stator 10th
  • the insulating material 50 is around some of the pairs 40-45 of each other
  • the insulating material 50 each enclosing a first pair 40 of ends 48 of the conductor elements 20, 21, is spaced apart from the insulating material 50 which has a second pair 41 of ends immediately adjacent to the first pair 40 of ends 48 of the conductor elements 20, 21 48 of the conductor elements 20, 21 encloses.
  • the insulating materials 50 are shown in FIG. 1 and FIG.
  • Bridge means 60 indirectly connected.
  • the ring may have grooves.
  • the ends 48 of the conductor elements 20, 21 are partially disposed in the grooves but spaced from the ring.
  • the insulating material 50 closes this distance between the ends 48 of the conductor elements 20, 21 and the ring.
  • the bridging means 60 is an additional element to the stator 10 with conductor elements 20, 21.
  • the bridge means 60 is a part or an area of the conductor element 20, 21 or another part of the stator 10. Again, the gap or distance by means of the insulating material 50 is bridged.
  • the ends 48 of the conductor element 20, 21 may be bent accordingly, so that in the imaginary
  • Extension of the ends 48 of the conductor element 20, 21 is a part or area of the
  • Conductor element 20, 21 is located. Electrical connection elements or conductor elements 20, 21 for electrically connecting the stator 10 are not shown in FIG. 1 or in FIG. 2.
  • FIG. 3 shows a schematic cross-sectional view of a pair 40-45 of ends 48 of conductor elements 20, 21 with bridge means 60.
  • FIG. 4 shows another schematic cross-sectional view of a pair 40-45 of ends 48 of conductor elements 20, 21 with bridge means 60.
  • Bridge means 60 a gap between the end edges 70, 75 of the ends 48 of
  • Fig. 3 an additional element as a bridge means 60 is present.
  • the conductor element 20, 21 or a part thereof itself is the bridge means 60.
  • the end 48 of the conductor element 20, 21 and the ends 48 of the conductor elements 20, 21 bent accordingly, so that in the direct imaginary extension the ends 48 of the conductor elements 20, 21 a part of the respective conductor element 20, 21 itself is present.
  • the ring or the bridging means can also act as spacers to a cover of the stator or the electric machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

La présente invention concerne un stator (10) pour une machine électrique, comprenant des éléments conducteurs (20, 21) insérés dans le stator (10), des extrémités (48) des éléments conducteurs (20, 21) saillant du stator (10) étant partiellement, en particulier par paires, soudés les uns entre les autres, caractérisé par un moyen de pontage (60) destiné à augmenter une épaisseur d'un matériau isolant (50) électrique aux extrémités (48) des éléments conducteurs (20, 21), ledit moyen de pontage (60) étant agencé à des faces frontales des extrémités (48) des éléments conducteurs (20, 21), espacé par une fente d'une distance prédéterminée des extrémités (48) respectives des éléments conducteurs (20, 21), la fente entre les extrémités (48) des éléments conducteurs (20, 21) et le moyen de pontage (60) étant conçue pour être pontée par le matériau isolant (50), ledit moyen de pontage (60) comportant une partie de l'élément conducteur (20, 21) ou un élément séparé.
PCT/EP2018/057794 2017-04-11 2018-03-27 Stator pour une machine électrique et procédé de fabrication d'un stator d'une machine électrique WO2018188945A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017206219.3A DE102017206219A1 (de) 2017-04-11 2017-04-11 Stator für eine elektrische Maschine und Verfahren zum Herstellen eines Stators einer elektrischen Maschine
DE102017206219.3 2017-04-11

Publications (1)

Publication Number Publication Date
WO2018188945A1 true WO2018188945A1 (fr) 2018-10-18

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WO (1) WO2018188945A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018131971A1 (de) * 2018-12-12 2020-06-18 Thyssenkrupp Ag Isolatorkranz, Stator und elektrische Maschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151260A (en) * 1959-12-08 1964-09-29 Gen Electric Arrangement for insulating coil leads and spacing end turns in a dynamoelectric machine
JP2000209802A (ja) * 1999-01-18 2000-07-28 Denso Corp 接合部の絶縁構造、回転電機の絶縁構造およびその製造方法
JP2013115832A (ja) * 2011-11-24 2013-06-10 Toyota Motor Corp モータ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151260A (en) * 1959-12-08 1964-09-29 Gen Electric Arrangement for insulating coil leads and spacing end turns in a dynamoelectric machine
JP2000209802A (ja) * 1999-01-18 2000-07-28 Denso Corp 接合部の絶縁構造、回転電機の絶縁構造およびその製造方法
JP2013115832A (ja) * 2011-11-24 2013-06-10 Toyota Motor Corp モータ

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