EP4659334A1 - Procédé de fabrication d'un noyau stratifié et noyau stratifié - Google Patents

Procédé de fabrication d'un noyau stratifié et noyau stratifié

Info

Publication number
EP4659334A1
EP4659334A1 EP24707131.9A EP24707131A EP4659334A1 EP 4659334 A1 EP4659334 A1 EP 4659334A1 EP 24707131 A EP24707131 A EP 24707131A EP 4659334 A1 EP4659334 A1 EP 4659334A1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
laminated core
bead
sheet
layers
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
EP24707131.9A
Other languages
German (de)
English (en)
Inventor
Ronald Fluch
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl 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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP4659334A1 publication Critical patent/EP4659334A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/24—Protection against failure of cooling arrangements, e.g. due to loss of cooling medium or due to interruption of the circulation of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/09—Magnetic cores comprising laminations characterised by being fastened by caulking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a laminated core, in particular for an electrical machine, with a plurality of layers arranged one above the other, wherein the layers each have a single first sheet metal part or a plurality of second sheet metal parts arranged next to one another, with a hot-melt adhesive lacquer layer, for example baking varnish, provided between the layers, in particular a thermo-hardened one, which connects the first or second sheet metal parts to one another in a materially bonded manner and over the entire surface, and with at least one cooling channel which runs through the layers of the laminated core, for which the respective first or second sheet metal parts have at least one channel recess, wherein the cooling channel is arranged eccentrically to a longitudinal axis of the laminated core running through the center of the laminated core.
  • a hot-melt adhesive lacquer layer for example baking varnish
  • a reduced size with increased power density in laminated sheet packages requires cooling with coolant, for example with the help of cooling channels through the sheet package - which requires a gap-free arrangement between the layers, each with a single first sheet part or several second sheet parts arranged next to each other.
  • coolant for example with the help of cooling channels through the sheet package - which requires a gap-free arrangement between the layers, each with a single first sheet part or several second sheet parts arranged next to each other.
  • undesirable impairment of the properties of the hot-melt adhesive layer or other negative influencing factors the formation of gaps between the layers cannot be reliably ruled out - especially not when there is a high fluid pressure on the sheet package.
  • Such sheet packages are therefore often not usable in high-performance areas with intensive cooling requirements.
  • the invention solves the problem by the features of claim 1.
  • the stability of the laminated core against the passage of liquid between the layers can be improved if the first or second sheet metal part in at least two layers has at least one bead, by means of which the at least two layers interlock.
  • these beads completely surround the channel recess of the respective first or second sheet metal part, avoiding inclusion of the longitudinal axis. This complete circumferential movement can ensure that there is at least no gap in these areas of the bead when the sheet metal parts are stacked.
  • a type of barrier is formed on the laminated core between the layers - which can ensure that even with gap-free laminated cores, these can withstand even higher hydraulic pressures, as is necessary, for example, for internal cooling of a stator and/or rotor laminated core in the high-performance range.
  • Such beads can also be advantageously created on the laminated core using known methods, such as those known for clinch joining.
  • each layer of the laminated core has a first sheet metal part.
  • a sealing compound advantageously based on resin, can be provided on the abutting surfaces between the second sheet metal parts arranged next to one another, which can, for example, further increase the pressure resistance.
  • the laminated core according to the invention is therefore not only robust and can be used even at high hydraulic pressures, but can also be produced cost-effectively and reproducibly.
  • the risk of disruption of the edge of the cooling channel due to the sheet metal forming of the bead can be kept low if a bead base of the bead runs at a distance, in particular radial, from the channel recess of at least the sheet metal thickness of the first or second sheet metal part.
  • the distance, in particular radial corresponds to at least 5 times a sheet metal thickness of the first or second sheet metal part.
  • the distance, in particular the radial distance corresponds to a maximum of 20 times the sheet thickness of the first or second sheet metal part. It may already be sufficient if the distance, in particular the radial distance, corresponds to a maximum of 12 times the sheet thickness of the first or second sheet metal part. This can result in a distance, in particular the radial distance, in the range of 1 to 20 times a sheet thickness, 1 to 12 times a sheet thickness, 2 to 10 times a sheet thickness, 5 to 20 times a sheet thickness or 5 to 12 times a sheet thickness.
  • Comparable conditions in terms of media tightness around the channel recess can be achieved if the bead base of the bead runs at an essentially constant, particularly radial, distance from the channel recess. This also allows the stability of the cooling channel against leakage to be further improved.
  • the risk that the bead will have a detrimental effect on the contour of the channel recess during manufacture can be reduced if the sheet metal section between the bead and the channel recess runs in the sheet metal plane. If the channel axis of the cooling channel runs parallel to the longitudinal axis of the laminated core, the complexity of manufacturing the interlocking beads can be reduced - which can lead to a more cost-effective laminated core.
  • the above can be further improved if the channel recess is curved and/or if the bead around the channel recess is curved.
  • the bead is designed as a round bead, box bead or trapezoidal bead. This can also ensure a sufficiently high barrier effect against the passage of liquid - even when a comparatively high hydraulic pressure is applied.
  • the beads each have a bead height in the range of greater than or equal to 0.5 times to less than or equal to 2 times, in particular 1 time, the thickness of the sheet metal part.
  • projections designed in this way can be provided on the sheet metal part relatively easily.
  • the sheet metal part can, for example, have a thickness of 0.1 to 1 mm, in particular 0.2 to 0.5 mm.
  • the sheet thickness of the first or second sheet metal part is from 0.1 mm to 0.35 mm, preferably from 0.2 mm to 0.3 mm.
  • the laminated core according to the invention can be particularly suitable for an electrical machine, for example as a stator or as a rotor.
  • the invention also has the object of providing a method with which a laminated core with a cooling channel that is media-tight against leakage can be reproducibly created.
  • the invention solves the problem by the features of claim 13.
  • the conditions for a particularly secure barrier against the passage of liquid between the layers of the sheet metal package can be created.
  • this process step can be easily provided for when bundling sheet metal packages with comparatively simple forming processes that are also known from clinching - which also leads to advantages in handling for the process.
  • the process according to the invention therefore makes it possible to create reproducible sheet metal packages without significant additional effort, which can withstand liquid cooling with comparatively high hydraulic pressures.
  • the sheet metal or sheet metal strip is provided with a full-surface, in particular thermo-curable, hot-melt adhesive lacquer layer, in particular baking varnish, on both flat sides in order to further improve the media tightness of the cooling channel.
  • Fig. 1 is a schematic view of a device for producing sheet metal packages from first or second sheet metal parts
  • Fig. 2 is an enlarged partial view of four layers of the laminated core according to Fig. 1 and Fig. 3 is a partial plan view of the laminated core manufactured according to Fig. 1 with layers of first or second sheet metal parts.
  • a device 1 for carrying out the method according to the invention is shown schematically.
  • This device 1 is used for bundling sheet metal packages 3 from laminated sheet metal parts 2a, 2b.
  • a sheet metal strip 5 namely electrical steel strip (or from an electrical sheet in the case of a sheet)
  • a coil 4 which has a full-surface hot-melt adhesive lacquer layer 8, namely baked varnish, in the B state on one flat side 7 of its two flat sides 6, 7 - only indicated in Fig. 1.
  • a full-surface hot-curing hot-melt adhesive lacquer layer 8, namely baked varnish is applied to both flat sides 6 and 7 - but this has not been shown.
  • the sheet metal strip 5 has a strip thickness of 0.3 mm (millimeters).
  • the hot melt adhesive varnish can have an epoxy resin base.
  • the hot melt adhesive varnish is preferably a bisphenol-based epoxy resin system with a hardener, for example with a dicyandiamide base.
  • the hot melt adhesive varnish mentioned can be a bisphenol-A-epichlorohydrin resin system with dicyanamide as a hardener. This two-stage curing epoxy resin system is in the B state on the sheet or sheet metal strip. This makes the partially cross-linked hot melt adhesive varnish reactive.
  • the hot melt adhesive varnish in the B state reacts further and can thus be converted to the fully cross-linked C state - which is also referred to as baking or final curing.
  • this partially cross-linked hot melt adhesive layer has a thickness of a few micrometers.
  • a number of sheet metal parts 2a, 2b are separated from the adhesive-coated sheet metal strip 5 using a punching tool 11 - in the exemplary embodiment, a subsequent punching tool.
  • a punching tool 11 carries out cutting with several strokes 12.
  • the cutting edges 13a, 13b in the upper tool 11a of the punching tool 11 interact with the respective dies 14a, 14b of the lower tool 11b of the punching tool 11 and thus form two punching stages 15a, 15b in the punching tool 11.
  • a channel recess 16 is introduced into the sheet metal strip 5, namely punched in - which can be seen from the punched-out remaining piece 17 in Fig. 1.
  • the channel recess 16 is provided in the sheet metal strip 5 for each individual sheet metal part 2a, 2b in order to enable a cooling channel 18 through the entire sheet metal package 3.
  • the cutting edge 13b separates the sheet metal part 2a, 2b from the sheet metal strip 5 - this is done with the help of the punching stage 15b, which punches the sheet metal parts 2a, 2b free, pushes them into a stacking device 19 by the pressure of the upper tool 11a and stacks them there.
  • the stacking device 19 has a guide in the lower tool 11b.
  • a counterholder 10, partially shown in Fig. 1, is also provided in the guide.
  • the stacking device 19 is actively heated in order to thermally activate the baked enamel layer of the sheet metal parts 2a, 2b and to produce an adhesive bond, i.e. a material bond, between the sheet metal parts 2a, 2b.
  • the hot melt adhesive 8 is baked and converted into the C state, which laminates the sheet metal parts 2a, 2b into a sheet metal package 3.
  • the sheet metal parts 2a, 2b are thus bonded together over their entire surface.
  • the adjacent sheet metal parts 2a, 2b are thus held together by a full-surface, material-locking connection provided between them.
  • the cooling channel 18 is arranged eccentrically to a longitudinal axis L of the laminated core 3 running through the center of the laminated core 3, and thus does not run centrically through the laminated core 3.
  • the longitudinal axis L is the Central longitudinal axis of the laminated core 3, i.e. a longitudinal axis L running through the middle of the laminated core 2. In the exemplary embodiment, this longitudinal axis L is also an axis of symmetry of the laminated core.
  • a holder 20 in the laminated core 3 runs centrally through the laminated core, since the laminated core 3 is used as a rotor for an electrical machine 100 and the holder 20 serves for a rotor shaft. However, it is also conceivable that the laminated core 3 is used as a stator and the holder 20 is intended to accommodate a rotor (not shown).
  • the cooling channel 18 is improved in its media-tightness. This is done by introducing beads 9 into the sheet metal strip 5 by sheet metal forming. These beads 9 are produced by hollow stamping at the forming stage 21 with a punch 22a and a die 22b. Each sheet metal part 2 of a sheet metal package 3 thus has a projection and a recess 9a, 9b due to the bead.
  • the individual sheet metal parts 2a, 2b are then stacked to form a sheet metal package 3 with several layers 3a, 3b, 3c, 3d in such a way that several layers 3a, 3b, 3c, 3d of the sheet metal package 3 interlock via the beads 9 - as can be seen specifically in Fig. 2 for the first sheet metal parts 2a.
  • a bead 9 with a projection 9a on a sheet metal part 2a engages in a complementary recess 9b of a bead 9 on an adjacent sheet metal part 2a.
  • These beads 9 are also specially designed - namely, these beads 9 completely surround the channel recess 16 of the respective first or second sheet metal part 2a, 2b, avoiding inclusion of the longitudinal axis L - as can be seen in Fig. 3.
  • the longitudinal axis L running through the center M of the sheet metal package 3 therefore does not pass through the area spanned by this circumference.
  • the laminated core 3 can therefore be stably exposed to liquid cooling - for example with water - and comparatively high hydraulic pressures. This makes it suitable the laminated core 3 particularly as a stator or rotor, especially when small size and high electrical power are required from an electrical machine, such as an electric motor and/or generator.
  • the circulation also takes place at a sufficient radial distance A between a bead base 9c of the bead 9 and the channel recess 18, as can be seen in Fig. 3.
  • the radial distance A here is 2 mm (millimeters) with a sheet thickness d of 0.3 mm.
  • This radial distance A is therefore always greater than 5 times the sheet thickness d, but not more than 12 times or 20 times this sheet thickness d - which reliably prevents leakage at the cooling channel 18.
  • the radial distance A is 0.3 mm, i.e. a sheet thickness d, which has not been shown.
  • the bead base 9c of the bead 9 runs at a substantially constant radial distance A from the channel recess 16.
  • the bead 9 and channel recess 16 run elliptically curved and concentrically as shown.
  • Other courses, such as circular courses, are conceivable.
  • a varying distance is also conceivable, which has not been shown in more detail.
  • the radial distance A is to be considered in the sense of a minimum distance A between the edge of the channel recess 16 and the bead base 9c of the bead 9.
  • the minimum distance A thus avoids disruption of the edge of the cooling channel 16 due to previous processing steps.
  • a sheet metal section 24 also runs between the bead 9 and the channel recess 16 in the sheet metal plane E, as shown in Fig. 2, in order to avoid any impairment of the dimensional accuracy of the cooling channel 18 during sheet metal forming.
  • a first sheet metal part 2a is provided in a layer 3a, 3b, 3c, 3d.
  • a Second sheet metal parts 2b arranged next to one another in layers 3a, 3b, 3c, 3d, namely two second sheet metal parts 2b, are to be provided.
  • the second sheet metal parts 2b abut one another at the abutting surface 23 shown in dashed lines in the layer 3b shown in Fig. 3.
  • a resin-based sealing compound (not shown) can be provided between the second sheet metal parts 2b at the abutting surface 23.
  • the beads 9 are formed by a round bead.
  • a round bead can be characterized (in comparison with a box bead, trapezoidal bead, etc.) for a more uniform pressure application of the adhesive between the sheet metal parts 2a, 2b when stacking.
  • the bead height h is essentially equal to the thickness d of the sheet metal part 2.
  • a sheet metal part 2a, 2b engages at most with an adjoining sheet metal part 2a, 2b - which not only simplifies the sheet metal package 3, but also facilitates the process of packaging.
  • Fig. 3 is also schematically defined as part of an electrical machine 100 in which a cooling liquid 25 flows through the cooling channel 18 to cool the laminated core 3.
  • the laminated core 3 according to the invention withstands liquid cooling even with high hydraulic pressure and thus allows high power densities in this electrical machine 100 with small dimensions.
  • the sheet metal section 24 of the first or second sheet metal part 2a, 2b, which determines the constant section A, runs flat.
  • the channel axis K of the cooling channel 18 runs parallel to the longitudinal axis L of the laminated core 3.
  • the channel recess 16 runs circularly and/or the bead 9 circular.
  • the bead 9 is arranged coaxially to the channel recess 16.
  • any course is conceivable, which has not been shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un procédé de production d'un noyau stratifié (3) et le noyau stratifié (3), qui comprend au moins un canal de refroidissement (18) traversant les couches (3a, 3b, 3c, 3d) du noyau stratifié (3). L'invention vise à fournir au noyau stratifié (3) un canal de refroidissement (18) qui est étanche aux milieux pour éviter une fuite. À cet effet, sur au moins deux couches (3a, 3b, 3c, 3d), la première ou la deuxième partie de feuille (2a, 2b) respective présente au moins un bourrelet (9), les au moins deux couches (3a, 3b, 3c, 3d) viennent en prise l'une dans l'autre au moyen desdits bourrelets (9) et les bourrelets (9) s'étendent complètement autour de l'évidement de canal (16) respectif de la première ou de la deuxième partie de feuille (2a, 2b) en question, empêchant ainsi l'axe longitudinal (L) d'être enfermé.
EP24707131.9A 2023-02-01 2024-02-01 Procédé de fabrication d'un noyau stratifié et noyau stratifié Pending EP4659334A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23154573.2A EP4412047A1 (fr) 2023-02-01 2023-02-01 Procédé de fabrication d'un paquet de tôles et ce paquet de tôles doté d'au moins un canal de refroidissement
PCT/EP2024/052552 WO2024160983A1 (fr) 2023-02-01 2024-02-01 Procédé de fabrication d'un noyau stratifié et noyau stratifié

Publications (1)

Publication Number Publication Date
EP4659334A1 true EP4659334A1 (fr) 2025-12-10

Family

ID=85173039

Family Applications (2)

Application Number Title Priority Date Filing Date
EP23154573.2A Withdrawn EP4412047A1 (fr) 2023-02-01 2023-02-01 Procédé de fabrication d'un paquet de tôles et ce paquet de tôles doté d'au moins un canal de refroidissement
EP24707131.9A Pending EP4659334A1 (fr) 2023-02-01 2024-02-01 Procédé de fabrication d'un noyau stratifié et noyau stratifié

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP23154573.2A Withdrawn EP4412047A1 (fr) 2023-02-01 2023-02-01 Procédé de fabrication d'un paquet de tôles et ce paquet de tôles doté d'au moins un canal de refroidissement

Country Status (3)

Country Link
EP (2) EP4412047A1 (fr)
CN (1) CN120660260A (fr)
WO (1) WO2024160983A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004035602A1 (de) * 2004-07-22 2006-03-16 Siemens Ag Elektrische Maschine
DE102017010383A1 (de) * 2017-11-09 2018-05-30 Daimler Ag Rotationsmotor mit einem Rotorelement und mit einem Statorelement
DE102021203452A1 (de) * 2021-04-07 2022-10-13 Volkswagen Aktiengesellschaft Gekühlter Rotor mit Dichtungsvorrichtung, Elektromaschine, Kraftfahrzeug und Verfahren zur Herstellung eines Rotors

Also Published As

Publication number Publication date
CN120660260A (zh) 2025-09-16
WO2024160983A1 (fr) 2024-08-08
EP4412047A1 (fr) 2024-08-07

Similar Documents

Publication Publication Date Title
EP3669439B1 (fr) Rotor pour moteur électrique, en particulier d'un véhicule automobile, et procédé de fabrication dudit rotor
EP1016105B1 (fr) Procede et dispositif de fabrication de paquets formes de lames de toles pour noyaux magnetiques
WO2020120444A1 (fr) Procédé de fabrication d'une unité de noyaux feuilletés pour une machine électrique, en particulier un véhicule à moteur
DE102012221875A1 (de) Ausbalancierter Rotorkern, der Kernbleche mit verringerter Masse und Massenträgheit aufweist
EP3381107B1 (fr) Tole electrique dotee d'une ame imprimee
EP3736062A1 (fr) Procédé d'assemblage par boutonnage d'éléments de tôle à des paquets de tôle
DE102019203291A1 (de) Blechpaket für einen Rotor einer Synchronmaschine
DE102016110795A1 (de) Metallplattenstanzverfahren und Metallplattenstanzsystem
DE102015211190A1 (de) Verfahren zum Herstellen eines laminierten Eisenkerns
EP4420226A1 (fr) Procédé de production d'au moins un canal de liquide dans un noyau feuilleté et noyau feuilleté avec ledit canal de liquide
EP0133858A1 (fr) Procédé et dispositif pour fabriquer des paquets composés de lames de tôle pour des noyaux magnétiques de machines électriques
DE112023003735T5 (de) Verfahren zur herstellung eines mehrschichtmaterials vor der stanzpresse für geblechte elektromotorkomponenten
DE102014220510A1 (de) Lamellenpaket eines Rotors oder Stators für eine elektrische Maschine sowie Verfahren zum Fertigen desselben
DE102019103133B3 (de) Verfahren zum Herstellen eines Stator-Blechpakets einer elektrischen Maschine
DE102012215084A1 (de) Rotor einer elektrischen Maschine und elektrische Maschine
EP4659334A1 (fr) Procédé de fabrication d'un noyau stratifié et noyau stratifié
DE102015208870A1 (de) Verfahren zur Herstellung eines Blechpakets
EP3514925A1 (fr) Procédé d'assemblage d'éléments de tôle à des paquets de tôle
EP4311085A1 (fr) Paquet de tôles, ainsi que son procédé de fabrication
EP2436456A2 (fr) Rondelle d'écartement pour transmission et son procédé de fabrication
DE69507996T2 (de) Verfahren zur Herstellung eines Blechpakets zur Herstellung eines Läufers
EP2320441A1 (fr) Aide au montage pour paquets de tôles de découpe
DE102023201718A1 (de) Blechpaket für eine elektrische Maschine, elektrische Maschine, Fahrzeug und Verfahren
WO2024223033A1 (fr) Procédé de fabrication d'au moins un canal de liquide dans un noyau feuilleté, noyau feuilleté fabriqué avec celui-ci et machine électrique comprenant ce noyau feuilleté
DE102010002003A1 (de) Elektromotorkörper und Verfahren zur Herstellung eines Elektromotorkörpers

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20250901

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR