Classifications

• • 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
  • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
  • B32B37/1207—Heat-activated adhesive
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B38/00—Ancillary operations in connection with laminating processes
  • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
  • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
  • H01F41/0206—Manufacturing of magnetic cores by mechanical means
  • H01F41/0233—Manufacturing of magnetic circuits made from sheets
• • 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
  • H02K1/12—Stationary parts of the magnetic circuit
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/03—3 layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties

Definitions

• the present invention relates to a method for producing a stack of laminations, in particular an electrical laminated core.
• the invention also relates to a stack of laminations, in particular a rotor package and / or a stator package.
• the invention further relates to a machine component, in particular a rotor and / or a stator, as well as a drive train and an electric motor.
• the present invention is based on the object of providing a method by means of which sheet metal stacks can be produced in a simple and efficient manner.
• the method is preferably a method for producing a plurality of sheet metal stacks, which in particular also comprises method steps which take place after the actual production up to delivery.
• the one or more sheet metal stacks are preferably electrical sheet stacks.
• the method preferably comprises:
• Coating one or more sheets with a connecting material Connecting a plurality of metal sheets to form a sheet metal laminate by first activating the connecting material; Dividing the sheet metal laminate to produce a plurality of sheet metal laminate units and / or cutting out a plurality of sheet metal laminate units from the sheet metal laminate; Connecting the multiple sheet metal laminate units to form a sheet metal stack by a second activation of the connecting material.
• the joining of the several metal sheets to form a sheet metal laminate and the joining of the several sheet metal laminate units can preferably be carried out separately from one another.
• the connecting substance preferably has properties which enable two-stage activation.
• a “parameter” is preferably understood to mean a temperature or a pressure.
• first activation and / or the second activation provision can be made for the first activation and / or the second activation to be carried out by setting certain further reaction conditions, for example different pH values.
• connection of the plurality of metal sheets by the first activation of the connection material is preferably a material connection.
• the connection of the plurality of sheet metal laminate units by the second activation of the connection material is, in particular, an integral connection.
• the connecting material is an adhesive.
• a sheet is coated on both sides with the connecting material and then a further sheet is brought into contact with the coatings on both sides of the coated sheet.
• the three metal sheets are then preferably connected to one another by the first activation of the connecting substance, in particular in a materially bonded manner.
• all metal sheets are preferably coated on both sides.
• the sheet stack is, for example, a sheet stack.
• the sheets are, for example, electrical sheets, in particular comprising an iron-silicon alloy.
• the sheets are produced by cold rolling.
• the sheets are finally annealed, for example after cold rolling.
• the coating of the one or more metal sheets with the connecting material is preferably carried out over the entire surface.
• a thickness of the connecting material is preferably at least approximately constant after coating perpendicular to a main plane of extension of the respective sheet metal.
• the coating of the one or more metal sheets with the connecting material is preferably carried out without bubbles and / or without degassing.
• the method is preferably a continuous method and / or suitable for the series production of sheet metal stacks.
• Inline preferably means in a continuous process.
• the method is preferably part of a flow production, in which in particular a locally progressing, time-determined, uninterrupted sequence of operations is implemented.
• the first activation is a thermal activation.
• the second activation is a thermal activation.
• the connecting substance is preferably selected such that it reacts in two different temperature ranges.
• a chemical and / or physical crosslinking and / or bonding reaction preferably takes place in two different temperature ranges.
• a first temperature, to which the connecting substance is heated during the first activation, and a second temperature, to which the connecting substance is heated during the second activation increases by approx. 30 ° C. or more, in particular by about 40 ° C or more, for example by about 50 ° C or more, differ from each other.
• the first temperature and the second temperature preferably differ from one another by 80 ° C. or less, in particular about 70 ° C. or less, for example about 60 ° C. or less.
• a ratio of the second temperature in the second activation and the first temperature in the first activation is preferably 1.5: 1 or more, in particular about 2.5: 1 or more, for example about 3: 1 or more.
• a ratio of the second temperature in the second activation and the first temperature in the first activation is preferably 4.5: 1 or less, in particular approximately 4: 1 or less, for example approximately 3.5: 1 or less.
• first activation and the second activation are thermal activations
• the first activation is a thermal activation and the second activation is an activation by pressure or vice versa.
• both the first activation and the second activation are activations by pressure.
• connection direction is preferably essentially perpendicular to a main plane of extent of the metal sheets or the sheet metal laminate units.
• a reaction space in which the respective activation is carried out is subjected to an overpressure or a negative pressure and thus activation is carried out by pressure.
• the first activation and / or the second activation is a chemical activation.
• reaction initiator for example a radical initiator and / or a crosslinking agent, is preferably added to the compound at the time of activation.
• a gas is introduced into the reaction space.
• the plurality of metal sheets which are connected to one another are provided wound up.
• the one or more metal sheets are unwound for coating with the connecting material.
• the metal sheets are provided wound up to form a coil.
• the sheet laminate resulting from the joining of the sheets is wound up before it is treated in the further process.
• the sheet metal laminate is further processed, it is in particular unwound.
• the multiple sheets are preferably brought into contact with one another and / or pressed together on their aligned flat sides after coating.
• the sheets arranged one above the other are pressed together in a pressing tool, for example a press.
• the compression is preferably carried out essentially perpendicular to a main plane of extent of the metal sheets.
• the compression and / or compression of the sheets coated with the connecting material can also take place by rollers, over which the sheets arranged one above the other and coated with the connecting material are guided.
• the plurality of metal sheets are electrical steel sheets
• an increased efficiency can be formed as a stator package and / or a rotor package of the sheet stack.
• Electrical steel sheets that follow one another in the stacking direction are preferably stacked one on top of the other rotated by about 30 ° to about 120 ° with respect to a main grain orientation direction.
• two sheets are transversely and two sheets lengthways in a pressing tool, for example in a press, arranged.
• the main grain orientation directions of different sheets in the resulting sheet stack are preferably not parallel, in particular wind crooked.
• the sheet metal laminate is preferably a flat material which comprises several layers of sheet metal which are connected to one another in a materially bonded manner by the connecting material. It can be provided that the plurality of metal sheets are provided on a roll and / or wound into a roll. A width of the roll transversely to a winding direction is preferably approx. 100 mm or more, in particular approx. 120 mm or more, for example approx. 130 mm or more.
• the width of the roll is preferably about 350 mm or less, in particular about 300 mm or less, for example about 200 mm or less.
• rollers in particular for the manufacture of a rotor, are approximately 157.5 mm wide.
• the rollers have a width of approx. 200 mm or more, for example a width in a range from approx. 300 mm to approx. 350 mm.
• stators and rotors can in particular be produced in such a way that the diameter of the stators is greater than the diameter of the rotors.
• An outside diameter of one or more stators is preferably larger than an outside diameter of one or more rotors.
• the one or more stators and the one or more rotors can in particular be fastened relative to one another in such a way that the one or more stators surround the one or more rotors.
• the stacking direction is preferably perpendicular to a main extension plane of the sheet metal laminate and / or a main extension plane of a sheet metal.
• the plurality of metal sheets are provided in a pre-coated form, in particular on both sides.
• the pre-coating preferably comprises one or more of the following substances or is formed from one or more of the following substances: polyvinyl butyral, polyamide, polyester, modified polyamide, epoxy.
• the precoating serves in particular to improve the adhesion of the connecting material to a sheet metal surface.
• a so-called "back varnish”, for example, is suitable as a pre-coating.
• the pre-coating is preferably already cured when the connecting material is applied.
• the precoating is electrically insulating.
• Electrode insulating preferably means that such a characterized material and / or component and / or element has an electrical conductivity of about 10 7 S-cm 1 or less, in particular of about 10 8 S-cm 1 or less less. The values are based on measurements under standard conditions.
• the plurality of metal sheets are each coated on both sides with the connecting material.
• the connecting substance is mixed with a solvent before the coating, which in particular escapes directly after the coating and / or during the first activation.
• a ratio between a thickness of the one or more metal sheets and a layer thickness of the connecting material is in a range of approximately 20: 1 or more, in particular 25: 1 or more.
• the ratio between the thickness of the one or more metal sheets and the layer thickness of the connecting material is preferably approx. 250: 1 or less, in particular approx. 210: 1 or less.
• the layer thickness of the connecting substance after application and / or after the first activation is preferably approximately 1 ⁇ m or more, in particular approximately 4 ⁇ m or more, for example approximately 5 ⁇ m or more.
• the layer thickness of the connecting substance after application and / or after the first activation is preferably approximately 9 ⁇ m or less, in particular approximately 8 ⁇ m or less, for example approximately 7 ⁇ m or less.
• the layer thickness of the connecting material is approx. 6 ⁇ m.
• the layer thickness of the connecting material is preferably an average layer thickness perpendicular to the main plane of extent of the respective sheet after coating.
• the layer thickness denotes in particular the thickness of a single layer on a single side of the respective sheet metal.
• the thickness of the one or more sheets preferably denotes the thickness of exactly one sheet.
• the first activation is a thermal activation in which the connecting substance is heated to a first temperature.
• the first temperature during the first activation is preferably approx.
• the first temperature during the first activation is preferably about 90 ° C. or less, in particular about 80 ° C. or less.
• the connecting material is heated by means of a heating device during the first activation.
• an infrared heating device a resistance heating device and / or an induction heating device are used as the heating device.
• a convection heating device and / or a heating fan can be used as a heating device or as a component of the heating device.
• the first temperature and / or the second temperature is preferably that temperature which is set in a room in which the first activation or the second activation is carried out.
• the resulting sheet metal laminate is preferably cooled to room temperature (approx. 20 ° C.) and / or dried by means of a cooling device.
• the cooling device is preferably part of an active cooling channel through which the sheet metal laminate is passed.
• a preconsolidation of the plurality of sheets is preferably carried out.
• the sheet metal laminate is, for example, a compound sheet.
• a thickness of the sheets perpendicular to their main extension plane is preferably about 0.35 mm or less.
• the thickness of the sheets perpendicular to their main extension plane is preferably approximately 0.3 mm or less, in particular approximately 0.25 mm or less, for example approximately 0.2 mm or less.
• the thickness of the metal sheets perpendicular to their main extension plane is preferably about 0.05 mm or more, in particular about 0.1 mm or more, for example about 0.15 mm or more.
• all of the sheets have the same thickness.
• a “thickness” is preferably to be understood as an average thickness.
• metal sheets and / or sheet metal laminates are flat and / or planar, in particular parallel and / or perpendicular to their main extension planes.
• the metal sheets and / or sheet metal laminate units are preferably designed without protrusions and / or without protrusions. For example, so-called “interlocks" can be dispensed with.
• a local variation in thickness of the metal sheets and / or sheet metal laminate units is approximately 5% or less, in particular approximately 2% or less, based on an average thickness of the respective sheet metal and / or the respective sheet metal laminate unit.
• the local variation in thickness is preferably independent of openings and / or recesses in the metal sheets.
• the second activation of the connecting substance is carried out during the cutting of the sheet metal laminate to produce the multiple sheet metal laminate units and / or the severing of the multiple sheet metal laminate units from the sheet metal laminate.
• the second activation of the connecting material is carried out, in particular immediately, after the sheet metal laminate has been divided up to produce the multiple sheet metal laminate units and / or the multiple sheet metal laminate units have been separated from the sheet metal laminate.
• sheet metal laminate units are collected stacked in a press tool and / or the second activation is carried out within the press tool.
• the sheet metal laminate can be divided up and / or the plurality of sheet metal laminate units can be separated out by electromagnetic forming.
• a material weakening is preferably introduced into the sheet metal laminate, for example by shear cutting and / or wedge cutting and / or embossing.
• the sheet metal laminate is divided, preferably by generating an electromagnetic pulse, for example by a pulse generator.
• the division of the sheet metal laminate and / or the severing out of the plurality of sheet metal laminate units is preferably carried out partially or completely by shear cutting and / or wedge cutting and / or embossing.
• regions of the sheet metal laminate in which the division and / or the separation takes place are preheated, in particular locally, before and / or during the division and / or the separation. Local preheating is preferably carried out using a laser.
• a fine blanking tool is integrated into a pressing tool, for example into a conventional press.
• the sheet metal laminate units can be stacked on top of one another with the smallest possible air gap. Due to the smallest possible edge indentation, the sheet metal laminate units form, in particular, the largest possible volume in the resulting sheet metal stack.
• the sheet metal laminate units are joined by forming.
• the sheet metal laminate units and / or sheet metal stacks are joined by clinching, for example clinching.
• a stroke of a punching tool used is preferably 275 mm per stack.
• “Stack” is to be understood as meaning, for example, a thickness of a sheet metal laminate and / or a height of a stack of sheet metal laminate units and / or a thickness of the sheet metal stack.
• the thickness of the sheet metal laminate is preferably defined perpendicular to its main plane of extension.
• the height of the stack of sheet metal laminate units is preferably defined parallel to the stacking direction.
• the thickness of the stack of sheets is preferably defined perpendicular to a main extension plane of a sheet. It can be provided that the sheet metal stacks are stacked in a container, for example a small load carrier, and / or transported for further processing.
• the second activation of the connecting material is preferably a thermal activation in which the connecting material is heated to a second temperature.
• the second temperature is preferably approximately 120 ° C. or more, in particular approximately 130 ° C. or more.
• the second temperature is approximately 250 ° C. or less, in particular approximately 180 ° C. or less.
• the multiple sheet metal laminate units are preferably connected under pressure, in particular in a pressing tool, for example a press.
• a punching tool for punching the sheet metal laminate units is arranged within the pressing tool and / or integrated into it.
• the sheet metal laminate units are pressed against one another along the stacking direction, in particular over their entire surface. This is preferably carried out inside the pressing tool.
• the sheet stacks are identified.
• the identification is carried out in particular by means of a data matrix code and / or by means of laser inscription.
• the sheet metal laminate units are marked before they are connected.
• the object mentioned at the beginning is also achieved by a method for the production of a stack of sheets, in particular an electrical laminated core, the method preferably comprising the following:
• Coating one or more sheets with a connecting material Connecting a plurality of metal sheets to form a sheet metal laminate by first activating the connecting material;
• the connecting material preferably comprises a resin material and an elastomer material.
• the resin material is preferably a synthetic resin material.
• a multi-stage activation and / or gluing of the sheets can preferably take place.
• the elastomer material is preferably used for bonding by adhesion.
• the resin material is used for bonding by cohesion.
• the resin material preferably does not stick and / or react during the first activation.
• the resin material adheres and / or reacts during the second activation.
• the elastomer material preferably does not stick and / or react during the second activation.
• the connecting substance and / or a connecting substance-solvent mixture preferably forms a macroscopically homogeneous mass and / or a macroscopically homogeneous liquid.
• the connecting material is preferably mixed with a solvent before it is applied to the one or more metal sheets.
• a compound-solvent mixture is preferably to be understood as meaning an, in particular homogeneous, mixture of substances made up of the compound and the solvent.
• the connecting substance is essentially completely dissolved and / or dispersed in the solvent.
• a complete covering of a surface of the respective sheet with the connecting material is preferably formed.
• the connecting material contains the elastomer material in a proportion of approx. 1% by volume or more, in particular approx. 5% by volume or more, based on a total volume of the connecting material or based on a total volume of the connecting material.
• Solvent mixture contains.
• the proportion of the elastomer material in the connecting substance is preferably about 25% by volume or less, in particular about 20% by volume or less, based on the total volume of the connecting substance or based on the total volume of the connecting substance-solvent mixture.
• the connecting material contains the elastomer material in a proportion of approx. 1% by weight or more, in particular approx. 5% by weight or more, based on a total mass of the connecting substance or on a total mass of the connecting substance-solvent mixture.
• the proportion of the elastomer material in the connecting substance is preferably about 25% by weight or less, in particular about 20% by weight or less, based on the total mass of the connecting substance or based on the total mass of the connecting substance-solvent mixture.
• the elastomer material comprises a synthetic rubber material or is formed from it.
• the elastomer material comprises an acrylonitrile-butadiene rubber or is formed therefrom.
• Acrylonitrile-butadiene rubber is preferably synonymous with “nitrile-butadiene rubber”.
• Acrylonitrile-butadiene rubbers have the advantage that they preferably have a high resistance to mineral oils, fats and / or hydrocarbons.
• the elastomer material can comprise or be formed from a styrene-butadiene rubber.
• the connecting substance is preferably selected such that a Shore hardness A of the connecting substance is lower after the solvent has escaped than after the second activation.
• the Shore hardness A of the connecting substance before the first activation and / or before the solvent escapes is lower than after the second activation.
• the Shore hardness is preferably determined in accordance with one of the standards DIN EN ISO 868, DIN ISO 7619-1 and / or ASTM D2240-00.
• the Shore hardness A is determined in accordance with DIN 53505.
• the Shore hardness A of the connecting substance alone and / or the Shore hardness A of the connecting substance-solvent mixture is approx. 20 (Shore A) or more, in particular approx. 30 (Shore A) or more .
• the Shore hardness A of the connecting substance alone and / or the Shore hardness A of the connecting substance-solvent mixture is approx. 90 (Shore A) or less, in particular approx. 80 (Shore A) or less .
• the connecting material is preferably electrically insulating.
• the compound-solvent mixture is electrically insulating.
• the connecting material is electrically insulating after the first activation.
• the connecting material is electrically insulating after the second activation.
• the resin material comprises or is formed from an epoxy resin material and / or a thermosetting polymer material.
• Phenolic resin polymer materials are particularly suitable as thermosetting polymer materials.
• a phenolic resin polymer material with a formaldehyde-phenol ratio of less than 1: 1 is used as the resin material.
• Such phenolic resin polymer materials can preferably be obtained by acidic condensation of the starting materials.
• the resin material comprises or is formed from novolak.
• Novolaks are preferably thermoplastic and can be hardened by adding formaldehyde sources, for example hexamethyltetraamine.
• a proportion of the resin material in the connec tion material is approx. 1% by volume or more, in particular approx. 2% by volume or more.
• the proportion is preferably based on the total volume of the compound or based on the total volume of the compound-solvent mixture.
• the proportion of the resin material in the connecting substance is preferably about 15% by volume or less, in particular about 10% by volume or less, based on the total volume of the connecting substance or on the total volume of the connecting substance-solvent mixture.
• a proportion of the resin material in the connection material is approximately 1% by weight or more, in particular approximately 2% by weight or more.
• the proportion is preferably based on the total mass of the connecting substance or based on the total mass of the connecting substance-solvent mixture.
• the proportion of the resin material in the connecting substance is preferably about 15% by weight or less, in particular about 10% by weight or less, based on the total mass of the connecting substance or on the total mass of the connecting substance-solvent mixture.
• the connecting material is mixed with a solvent before the one or more metal sheets are coated.
• a proportion of the solvent is preferably about 65% by volume or more, in particular about 70% by volume or more, based on the total volume of the compound-solvent mixture.
• the proportion of the solvent is preferably about 95% by volume or less, in particular about 90% by volume or less, based on the total volume of the compound-solvent mixture.
• a proportion of the solvent is preferably approx. 65% by weight or more, in particular approx. 70% by weight or more, based on the total mass of the compound-solvent mixture.
• the proportion of the solvent is preferably approx. 95% by weight or less, in particular approx. 90% by weight or less, based on the total mass of the compound-solvent mixture.
• the connecting substance is essentially free of educts after the second activation.
• a reaction conversion rate of a crosslinking reaction of the connecting substance after the second activation is preferably approx. 40% or more, in particular approx. 50% or more, for example approx. 60% or more.
• the reaction conversion of the crosslinking reaction of the connecting substance after the second activation is preferably approx. 90% or less, in particular approx. 80% or less, for example approx. 70% or less.
• the solvent with which the connecting substance is added comprises in particular one or more medium-volatile to easily volatile organic solvents or is formed therefrom.
• An evaporation number of the solvent determined in particular according to DIN 53170, is preferably approx. 300 or less, in particular approx. 280 or less, for example approx. 250 or less.
• the evaporation number of the solvent is approx. 7 or more, in particular approx. 8 or more, for example approx. 10 or more.
• the evaporation number indicates, in particular, the ratio of a time in which a substance to be tested completely evaporates and a time in which diethyl ether completely evaporates.
• the solvent comprises a mixture of methoxypropyl acetate and butyl acetate or is formed therefrom.
• a volume ratio of methoxypropyl acetate and butyl acetate is preferably 10: 1 or less, in particular about 8: 1 or less, in particular about 6: 1 or less.
• the volume ratio of methoxypropyl acetate and butyl acetate is preferably about 2: 1 or more, in particular about 3: 1 or more, for example about 4: 1 or more.
• methoxypropyl acetate and butyl acetate are mixed in a volume ratio of approx. 1: 1.
• the connecting material comprises an adhesion promoter.
• the adhesion promoter preferably comprises an organically functionalized silane or is formed from it.
• the adhesion promoter preferably comprises an aminosilane or is formed from it.
• epoxysilanes are preferably used as organically functionalized silanes.
• the wettability of surfaces of the metal sheets to be coated can preferably be increased through the use of the adhesion promoter.
• the formation of chemical bonds between the surfaces of the metal sheets and components of the connecting material is particularly favored by the adhesion promoter.
• the precoating of the plurality of metal sheets acts as an adhesion promoter.
• a proportion of the adhesion promoter is preferably about 0.5% by volume or more, in particular about 1% by volume or more, based on the total volume of the connecting substance or based on the total volume of the connecting substance-solvent mixture.
• the proportion of the adhesion promoter is preferably about 6% by volume or less, in particular about 5% by volume or less, based on the total volume of the connecting substance or based on the total volume of the connecting substance-solvent mixture.
• the proportion of the adhesion promoter is preferably about 0.5% by weight or more, in particular about 1% by weight or more, based on the total mass of the connecting substance or based on the total mass of the connecting substance-solvent mixture.
• the proportion of the adhesion promoter is preferably approx. 6% by weight or less, in particular approx. 5% by weight or less, based on the total mass of the connecting substance or based on the total mass of the connecting substance-solvent mixture.
• the connecting substance is preferably selected such that an E modulus of the connecting substance alone and / or an E modulus of the connecting substance-solvent mixture is approx. 100 N / mm 2 or more, in particular approx. 300 N / 2 .
• the modulus of elasticity of the connecting substance alone and / or the modulus of elasticity of the connecting substance-solvent mixture is preferably approx. 1000 N / mm 2 or less, in particular approx. 800 N / mm 2 or less.
• the specified E-modules refer preferably to a measurement at approx. 20 ° C.
• connecting substance in particular as a connecting substance-solvent mixture
• the connecting substance is applied to the one or more metal sheets by means of one or more of the following coating processes: spraying, painting, pouring.
• a preferred composition of the connecting material consists of an acrylonitrile-butadiene rubber, novolak and aminosilane.
• the compound is preferably mixed with a mixture of methoxypropyl acetate and butyl acetate.
• the plurality of sheet metal laminate units preferably have an at least approximately round basic shape perpendicular to their main extension planes.
• the plurality of sheet metal laminate units each have an at least approximately circular opening in the center. Each opening is concentric with an outer circumference of the respective sheet metal laminate unit, in particular in a plan view. It can be favorable if the plurality of sheet metal laminate units have a plurality of recesses, in particular regularly arranged in the circumferential direction, towards one edge.
• the multiple recesses are, for example, passage openings.
• the plurality of recesses are preferably arranged in a ring.
• the plurality of recesses are at least approximately elongated, their main directions of extent each running along radial directions with respect to a central axis of the respective sheet metal laminate unit.
• the central axis is preferably a central axis through the centrally located opening.
• the openings and / or the multiple recesses of the individual sheet metal laminates are preferably arranged essentially congruently.
• the invention also relates to a stack of sheets, in particular a rotor package and / or a stator package, comprising a plurality of sheet laminate units.
• One or more sheet metal laminate units preferably comprise exactly three sheets, each of which is coated on both sides with a connecting material.
• the stack of sheets is produced in particular by a method according to the invention.
• a thickness of each sheet perpendicular to its main plane of extension is at most approx. 0.35 mm, preferably at most approx. 0.3 mm, in particular at most approx. 0.25 mm, in particular at most 0.2 mm. It can be favorable if the metal sheets of the sheet metal laminate units are designed to be flat perpendicular and / or parallel to a main plane of extent of at least one sheet metal.
• the metal sheets and / or sheet metal laminate units are free of projections and / or recesses.
• So-called "interlocks” for securing against displacement of the metal sheets and / or bleached laminate units along a direction lying in a respective main plane of extension of the metal sheets and / or bleached laminate units are preferably dispensable.
• the invention further relates to a machine component, in particular a rotor and / or a stator, comprising one or more sheet metal stacks, produced by a method according to the invention and / or comprising one or more sheet metal stacks according to the invention.
• the invention further relates to an electric motor, comprising a housing, a rotor and a stator, the rotor and / or the stator being machine components according to the invention.
• the electric motor is used in particular in a vehicle, for example a motor vehicle.
• the invention also relates to a drive train for a vehicle, in particular for an electric vehicle.
• the drive train comprises an electric motor according to the invention.
• the electric motor can comprise an electric motor, a gear or a gear-free electric motor.
• stator packs and / or one or more rotor packs are and / or are fixed to a housing, for example an electric motor, by electromagnetic reshaping.
• the one or more stator packs and / or the one or more rotor packs are and / or are pressed against the housing.
• the housing itself can also be produced by electromagnetic forming.
• a layer or a layer system is arranged between the housing and the one or more rotor packs and / or the one or more stator packs, which layer comprises or is formed from at least one ceramic material.
• FIG. 1 shows a schematic representation of a sequence of a method for the production of one or more sheet metal stacks, in which three sheets of metal wound into rolls are materially connected to one another;
• FIG. 2 shows a further schematic illustration of the method from FIG.
• FIGS. 1 and 2 shows a schematic representation of a section of the method from FIGS. 1 and 2;
• FIGS. 1 to 3 shows a schematic plan view of a sheet metal stack which was produced in a method illustrated in FIGS. 1 to 3.
• FIGS. A sequence of a method for producing a sheet metal stack 100 is shown schematically in FIGS. A series production of sheet metal stacks 100 can be implemented with the method.
• the laminated stacks 100 are preferably electrical laminated stacks 102, for example electrical laminated stacks 104.
• the electrical laminated stacks 104 are preferably used as rotor stacks 106 and / or stator stacks 108 in rotors and / or stators (not shown).
• the rotors and / or stators preferably form machine components of an electric motor.
• a diameter of a stator is preferably greater than a diameter of a rotor, in particular so that the stator and the rotor can be correspondingly fastened relative to one another.
• the stator surrounds the rotor in an assembled state.
• the electric motor is preferably an electric motor of a vehicle, for example a motor vehicle.
• the electric motor comprises a transmission.
• the electric motor is a gear-free electric motor.
• the electric motor preferably forms part of a drive train of the vehicle.
• a connecting material 110 is preferably applied and / or applied to one or more metal sheets 112.
• the sheets 112 form, for example, lamellae in a resulting sheet stack 100.
• three metal sheets 112 are each provided with a coating with the connecting material 110 on both sides.
• a layer with a substantially homogeneous thickness is formed perpendicular to a main extension plane of the respective sheet metal 112.
• the sheets 112 are preferably sheets 112 which comprise metallic materials or are formed therefrom.
• the sheets 112 are preferably electrical sheets 115.
• the sheets 112 are made from iron-silicon alloy (s) and / or are rolls processed into a flat material. In particular, the sheets 112 are finally annealed after cold rolling.
• metal sheets 112 which already have a pre-coating before they are coated with the connecting material 110.
• the precoating is designed in particular to be electrically insulating.
• the pre-coating preferably comprises one or more of the following substances or is formed from one or more of the following substances: polyvinyl butyral, polyamide, polyester, modified polyamide, epoxy.
• the precoating serves in particular to promote adhesion of the connecting material 110 to the metal sheets 112.
• the metal sheets 112 are each coated on both sides with what is known as a "baking varnish", which can in particular facilitate mechanical processing.
• the metal sheets 112 are provided wound up to form a roll 114.
• the metal sheets 112 are provided as coil material.
• a width of the rolls 114 and / or coils for rotor production is preferably in a range from approx. 150 mm to approx. 200 mm.
• the width of the rollers 114 and / or coils is preferably in a range from approx. 300 mm to approx. 350 mm.
• the width is defined in particular transversely to a winding direction.
• the metal sheets 112 are in particular unwound before the metal sheets 112 are coated with the connecting material.
• Fabric 110 is made.
• the metal sheets 112 are preferably coated on both sides with the connecting material 110.
• the coating with the connecting material 110 is preferably carried out in an inline process and / or continuously.
• the connecting material 110 is preferably an adhesive 116 and / or acts like an adhesive 116.
• the connecting material 110 is preferably used to connect the metal sheets 112 with a material bond.
• the connecting material 110 is applied to the metal sheets 112 offset with a solvent 118, the solvent 118 being selected in particular in such a way that it escapes after the application.
• the solvent 118 is selected, for example, in such a way that it has a comparatively high vapor pressure, so that it evaporates at room temperature and room pressure (approx. 1 bar) and / or at a first activation temperature 124.
• the solvent 118 comprises or is formed from one or more medium-volatile to highly volatile organic solvents.
• the solvent 118 is preferably selected such that both a resin material of the connecting material 110 and an elastomeric material of the connecting material are easily soluble therein.
• the solvent 118 preferably has an evaporation number according to DIN 53170 of approx. 300 or less, in particular approx. 280 or less, for example approx. 250 or less.
• the solvent 118 preferably has an evaporation number according to DIN 53170 of approx. 7 or more, in particular approx. 8 or more, for example approx. 10 or more.
• the evaporation rate is preferably a ratio of a time in which a substance completely evaporates and a time in which diethyl ether completely evaporates.
• the solvent 118 comprises a mixture of methoxypropyl acetate and butyl acetate or is formed from this mixture.
• a proportion of methoxypropyl acetate is preferably approx. 5% by volume or more, in particular approx. 50% by volume or more, for example approx.
• the proportion of methoxypropyl acetate in the solvent 118 is preferably about 75% by volume or less, in particular about 50% by volume or less, for example about 5% by volume or less, based on the total volume of the solvent 118 .
• a proportion of the solvent 118 in a compound-solvent mixture is approx. 65% by volume or more, in particular approx. 70% by volume or more.
• the proportion of the solvent 118 in the compound-solvent mixture is preferably approximately 95% by volume or less, in particular approximately 90% by volume or less.
• the percentages are preferably based on a total volume of the resulting compound-solvent mixture. It can be advantageous if a proportion of the solvent 118 in a compound-solvent mixture is approx. 65% by weight or more, in particular approx. 70% by weight or more.
• the proportion of the solvent 118 in the compound-solvent mixture is preferably approx. 95% by weight or less, in particular approx. 90% by weight or less.
• the percentages are preferably based on a total mass of the resulting compound-solvent mixture.
• the connecting substance 110 is preferably substantially completely dissolved in the solvent 118 and / or homogeneously distributed therein.
• the compound 110 mixed with the solvent 118 to form the compound-solvent mixture is applied to the one or more metal sheets 112 by means of one or more of the following coating processes: Spraying , Painting, pouring.
• the connecting substance 110 and / or the solvent 118 are preferably selected such that the connecting substance alone and / or the connecting substance-solvent mixture has a Shore hardness A of approx. 20 (Shore A) or more, in particular of approx. 30 ( Shore A) or more.
• the Shore hardness A of the connecting substance 110 alone and / or the Shore hardness A of the connecting substance-solvent mixture is preferably about 90 (Shore A) or less, in particular about 80 (Shore A) or less.
• the Shore hardness A of the connecting substance 110 after a first activation 122 and / or a second activation 150 and / or before the first activation in the connecting substance-solvent mixture is in a range from approx. 30 (Shore A) to approx 80 (Shore A).
• the connecting material 110 is preferably selected such that it is electrically insulating after the first activation 122 and / or after the second activation 150.
• a connecting material 110 which comprises a resin material and an elastomer material.
• the elastomer material comprises a synthetic rubber material or is formed from it.
• the elastomer material comprises an acrylonitrile-butadiene rubber and / or a styrene-butadiene rubber.
• the elastomer material is an acrylonitrile-butadiene rubber.
• a proportion of the elastomer material, in particular of the acrylonitrile-butadiene rubber, is preferably approx. 1% by volume or more, in particular approx.
• the proportion of the elastomer material is preferably about 25% by volume or less, in particular about 20% by volume or less, based on the total volume of the compound 110 or based on the total volume of the Compound-solvent mixture.
• a proportion of the elastomer material, in particular of the acrylonitrile-butadiene rubber, is preferably approx. 1% by weight or more, in particular approx. 5% by weight or more, based on a total mass of the connection Substance 110 or based on the total mass of the compound-solvent mixture.
• the proportion of the elastomer material is preferably about 25% by weight or less, in particular about 20% by weight or less, based on the total mass of the compound 110 or based on the total mass of the Compound-solvent mixture.
• the connecting material 110 comprises a resin material.
• a proportion of the resin material in the connecting substance 110 is preferably about 1% by volume or more, in particular about 2% by volume or more, based on the total volume of the connecting substance 110 or based on the total volume of the connecting substance solvent Mixture.
• the proportion of the resin material in the connecting substance 110 is preferably about 15% by volume or less, in particular about 10% by volume or less, based on the total volume of the connecting substance 110 or based on the total volume of the connecting substance-solvent mixture.
• a proportion of the resin material in the connecting substance 110 is preferably about 1% by weight or more, in particular about 2% by weight or more, based on the total mass of the connecting substance 110 or based on the total mass of the connecting substance-solvent mixture.
• the proportion of the resin material in the connecting material 110 is preferably approx. 15% by weight or less, in particular approx. 10% by weight or less, based on the total mass of the connecting material 110 or based on the total mass of the connecting material-solvent mixture.
• An epoxy resin material and / or a thermosetting polymer material have proven to be particularly preferred resin materials.
• the connecting material 110 comprises or is formed from a phenolic resin polymer material, in particular a novolak, as resin material.
• Novolaks are preferably phenolic resins with a formaldehyde-phenol ratio of less than 1: 1.
• the connecting material 110 comprises an adhesion promoter.
• the adhesion promoter preferably comprises an organically functionalized silane, in particular an aminosilane, or is formed from an organically functionalized silane, in particular an aminosilane.
• epoxysilanes can also be used as organically functionalized silanes.
• a proportion of the adhesion promoter is about 0.5% by volume or more, in particular about 1% by volume or more, based on the total volume of the connecting substance 110 or based on the total volume of the connecting substance solvent Mixture, is.
• the proportion of the adhesion promoter is preferably about 6% by volume or less, in particular about 5% by volume or less, based on the total volume of the connecting substance 110 or based on the total volume of the connecting substance-solvent mixture. It can be advantageous if the proportion of the adhesion promoter is about 0.5% by weight or more, in particular about 1% by weight or more, based on the total mass of the connecting substance 110 or based on the total mass of the connecting substance solvent Mixture, is.
• the proportion of the adhesion promoter is preferably approx. 6% by weight or less, in particular approx. 5% by weight or less, based on the total mass of the connecting substance 110 or based on the total mass of the connecting substance-solvent mixture.
• a modulus of elasticity of the connection material 110 and / or an E-module of the connection material-solvent mixture is preferably approx.
• the modulus of elasticity of the connecting substance 110 and / or of the connecting substance-solvent mixture is preferably approx. 1000 N / mm 2 or less, in particular approx. 800 N / mm 2 or less.
• a particularly preferred composition of the compound-solvent mixture consists essentially of a mixture of acrylonitrile-butadiene rubber, novolak, aminosilane and, as a solvent, a mixture of methoxypropyl acetate and butyl acetate.
• the sheets 112 After the sheets 112 have been coated with the connecting material 110, the sheets 112 are preferably brought together and / or arranged one above the other, so that in particular main planes of extension of the sheets 112 are arranged at least approximately parallel to one another.
• the electrical sheets 115 are preferably arranged one above the other in such a way that a main grain orientation direction of different electrical sheets 115 varies along a stacking direction.
• main grain orientation directions of electrical steel sheets 115 arranged one above the other in the stacking direction enclose an angle of approximately 30 ° or more, in particular of approximately 50 ° or more, with one another.
• Main grain orientation directions of electrical steel sheets 115 arranged one above the other in the stacking direction include, in particular, an angle of approximately 120 ° or less, in particular of approximately 100 ° or less, with one another.
• electrical steel sheets 115 arranged one above the other in the stacking direction are arranged alternately longitudinally and transversely with respect to their main grain orientation directions.
• a press room, in which the electrical steel sheets are preferably pressed together and / or pressed against one another after coating, can thus be optimally used.
• a thickness of the coating with the connecting material 110 is preferably selected such that a ratio of the thickness of the metal sheets 112 perpendicular to their main extension plane and a layer thickness of the connecting material 110 perpendicular to the main extension plane of the metal sheets 112 after and / or before the escape of the solvent 118 at approx 20: 1 or more, in particular about 25: 1 or more.
• the ratio of the thickness of the metal sheets 112 and the layer thickness of the connecting material 110 is preferably approximately 250: 1 or less, in particular approximately 220: 1 or less.
• a ratio of the thickness of a sheet metal 112 to the layer thickness of a layer of the connecting material 110 is in a range of approx. 200: 1 and approx. 28.55: 1.
• the thickness of the metal sheets 112 is approximately 0.2 mm in each case and a layer thickness of the connecting material 110 is approximately 1 ⁇ m or approximately 7 ⁇ m in each case.
• the thickness of the metal sheets 112 is preferably approximately 0.05 mm or more, in particular approximately 0.15 mm or more.
• the layer thickness of the connecting substance 110 after application and / or after the first activation 122 is preferably approximately 1 ⁇ m or more, in particular approximately 3 ⁇ m or more, for example approximately 5 ⁇ m or more.
• the layer thickness of the connecting substance 110 after application and / or after the first activation 122 is preferably approximately 9 ⁇ m or less, in particular approximately 8 ⁇ m or less, for example approximately 7 ⁇ m or less.
• the layer thickness of the connecting material 110 is on average approximately 6 ⁇ m on one side of the respective sheet metal 112 and / or taken together on both sides of the respective sheet metal 112.
• the sheet metal laminate units 140 and / or sheets 112 are preferably designed without so-called “interlocks”.
• the "interlocks” are arranged in particular on perpendicular and / or parallel to a main plane of extent of a sheet metal.
• the metal sheets 112 and / or the sheet metal laminate units 140 have no projections and / or recesses, in particular perpendicular and / or parallel to a respective main plane of extent. Exceptions to this are in particular openings and / or recesses in the metal sheets 112 for forming a rotor shape and / or stator shape.
• a local variation in thickness of the metal sheets 112 and / or sheet metal laminate units 140 is approx. 5% or less, in particular approx. 2% or less, based on an average thickness of the respective sheet metal 112 and / or the respective sheet metal laminate unit 140.
• the local variation in thickness is preferably independent of openings and / or recesses in the metal sheets 112 and / or sheet metal laminate units 140.
• the metal sheets 112 and / or sheet metal laminates 140 are flat.
• the sheets 112 coated with the connecting material 110 are preferably arranged and / or stacked one above the other in such a way that two layers of the connecting material 110 are directly adjacent and / or connected to one another between the central sheet 112 in the stacking direction and the two outer sheets 112 are.
• connection material 110 It can be favorable if the sheets 112, which are arranged one above the other and coated with the connection material 110, are fed to a reaction space 120 in which the first activation 122 of the connection material 110 is carried out.
• the first activation 122 is preferably carried out inline and / or while the metal sheets 112 are being passed through the reaction space 120.
• the first activation 122 is a thermal activation in which the connecting material 110 and / or the metal sheets 112 are heated to a first temperature 124.
• the sheets 112 which are arranged one above the other and coated with the connecting material 110, are passed through a heating device 126.
• the connecting material 110 and / or the metal sheets 112 are preferably heated to the first temperature 124 by the heating device.
• resistance heating devices and / or induction heating devices can also be used to heat the connecting material 110 and / or the metal sheets 112.
• a convection heating device and / or a heating fan can be used as heating device 126 or as a component of heating device 126.
• the first activation 122 is preferably carried out at a temperature of 50 ° C. or more, particularly 55 ° C. or more.
• the first temperature 124 during the first activation 122 is preferably approximately 90 ° C. or less, in particular approximately 85 ° C. or less.
• adhesive bonding between mutually adjacent layers of the connecting material 110 preferably takes place.
• the bonding is based, in particular, predominantly on adhesive forces.
• This first activation 122 at the first temperature 124 preferably leads to a cohesive connection of the layers of the connecting material 110 between the metal sheets 112.
• the connection takes place in particular due to a chemical and / or physical reaction of an elastomer material of the connecting material 110.
• the heated metal sheets 112 coated with the connecting material 110 are pressed together and / or pressed together.
• the compression and / or compression can take place, for example, by guiding the metal sheets 112 between rollers (cf. FIG. 2).
• the roles generate in particular an at least approximately constant contact pressure between the individual metal sheets 112.
• the first activation 122 preferably results in a sheet metal laminate 132 which comprises the — in the present case three — sheets 112 which are connected to one another in a materially bonded manner by means of the connecting material 110.
• the first activation 122 can also be activation by pressure and / or chemical activation.
• reaction space 120 in which the first activation 122 is carried out is subjected to an overpressure or a negative pressure.
• the metal sheets 112 to be connected can be pressed together, for example as described above.
• connection substance 110 is preferably brought into contact with a reaction starter and / or a reaction starter is added at the time of the first activation 122.
• a reaction starter is, for example, a crosslinking agent and / or a free radical initiator.
• a preconsolidation preferably takes place as a result of the first activation 122.
• the sheet metal laminate 132 is preferably passed through a cooling device 134.
• the cooling device 134 can be designed as an active cooling channel which is used to dry and / or cool the sheet metal laminate 132 to room temperature (approx. 20 ° C.).
• solvent 118 which has remained evaporated preferably substantially completely (indicated by dashed lines in FIGS. 1 and 3).
• the sheet metal laminate 132 is preferably unwound again in the event of a winding.
• the sheet metal laminate 132 is divided up and / or several sheet metal laminate units 140 are separated from the sheet metal laminate 132, preferably for the production of several sheet metal laminate units 140.
• the sheet metal laminate 132 is preferably fed to a tool 142 which comprises a punching tool 144.
• the punching tool 144 preferably comprises two tool halves, which are each equipped with one or more knife elements (not shown). By pressing the two tool halves of the punching tool 144 together, a predetermined shape is separated and / or cut out of the sheet metal laminate 132, preferably with the knife elements.
• the sheet metal laminate 132 is preheated, in particular before punching.
• a region of the sheet metal laminate 132 in which one or more knife elements of the punching tool 144 cut is preheated. This area is, for example, a cut edge area.
• Preheating is preferably carried out by means of a laser.
• the punching tool 144 is integrated into a pressing tool 145, for example a press.
• the pressing tool 145 is preferably used to press and / or press a plurality of sheet metal laminate units 140 against one another during a second activation 150 of the connecting material 110.
• a fine punching tool 146 is preferably used as punching tool 144.
• a fine blanking unit from Webo horrbau Oberschwaben GmbH is integrated into a conventional press.
• the punching is indicated schematically in FIGS. 1 and 3 with the reference numeral 148.
• the punching 148 completely divides the sheet metal laminate 132 or that the punching tool 144 first causes a material weakening and the sheet metal laminate 132 is then and / or completely divided up by an electromagnetic pulse.
• the electromagnetic pulse is generated, for example, by an electromagnetic pulse generator.
• the sheet metal laminate 132 is reshaped electromagnetically.
• the punching tool 144 has a stroke per stack of approx. 200 mm to approx. 350 mm, in particular from approx. 250 mm to approx. 300 mm, for example of about 275 mm.
• a “stack” here denotes in particular a thickness of a sheet metal laminate 132 and / or a height of a stack of sheet metal laminate units 140 and / or a thickness of the sheet metal stack 100.
• the thickness of the sheet metal laminate 132 is preferably defined perpendicular to its main plane of extent.
• the height of the stack of sheet metal laminate units 140 is preferably defined parallel to the stacking direction.
• the thickness of the sheet metal stack 100 is preferably defined perpendicular to a main plane of extent of a sheet metal 112.
• the sheet metal laminate units 140 are clinched.
• stacks of sheet metal 100 are clinched.
• a plurality of sheet laminate units 140 are preferably stacked immediately after the sheet metal laminate units 140 have been divided up and / or separated out.
• the sheet metal laminate units 140 are preferably connected to one another in a materially bonded manner.
• the cohesive connection of a plurality of sheet metal laminate units 140 is still carried out in the tool 142, in particular the pressing tool 145.
• the sheet metal laminate units 140 are preferably stacked one on top of the other, so that main planes of extension of the sheets 112 of the sheet metal laminate units 140 are arranged essentially parallel to one another.
• sheet laminate units 140 comprising electrical sheets 115 are arranged in such a way that their main grain orientation directions are offset from one another and / or not parallel and / or skewed are arranged.
• the cohesive connection of the sheet metal laminate units 140 is preferably carried out by the second activation 150 of the connecting material 110.
• the second activation 150 is preferably a thermal activation at a second temperature 152, which in particular by approx. 30 ° C or more, for example by approx. 50 ° C. or more, is greater than the first temperature 124 at the first activation 122.
• the stacks of sheet metal laminate units 140 are preferably heated by one or more heating devices 126.
• the connecting material 110 is heated to a temperature of approx. 120 ° C. or more, in particular of approx. 130 ° C. or more.
• adhesive bonding takes place in particular on the basis of cohesive forces between layers of the connecting material 110 arranged on the outer sides of the sheet metal laminate units 140.
• a crosslinking reaction of a resin-based portion of the connecting substance 110 preferably takes place during the second activation 150.
• the second activation 150 is colloquially referred to as "baking".
• thermal activation it can be provided that the second activation 150 is activation by pressure and / or chemical activation. With regard to activation by pressure and chemical activation, reference is made to the explanations in connection with the first activation 122.
• the stacks of sheet metal 100 are stacked and stored and / or transported further in containers, for example small load carriers.
• the stacking of sheet metal stacks 100 is indicated schematically in FIG. 1 with the reference numeral 158.
• the sheet metal stack 100 is identified (denoted by reference numeral 160).
• data matrix codes are used for identification 160.
• the identification 160 takes place, for example, by means of laser inscription.
• sheet metal laminate units 140 are already identified.
• an identification 160 is made for every three stacks of sheet metal stacks 100.
• a quality control 162 is preferably carried out prior to the delivery of the stacks of sheet metal 100 produced.
• a stack of sheets 100 is shown in a plan view.
• the sheet metal stack 100 preferably has an essentially round shape in plan view and / or comprises a centrally arranged opening 154.
• the sheet metal stack 100 has recesses 156 arranged in a ring in the form of passage openings.
• each sheet metal laminate 132 has essentially the same shape.
• the openings 154 and / or recesses 156 of all sheet metal laminate units 140 of a sheet metal stack 100 are preferably arranged essentially congruently in the sheet metal stack 100.
• a housing of the electric motor is pressed onto one or more rotor stacks 106 and / or one or more stator stacks 108 by means of electromagnetic forming.
• parts produced by sheet metal forming can form part of the housing or the housing can be and / or be made entirely from a sheet metal material.
• the housing can be a rolled and / or joined at butt ends, for example welded, semi-finished product.
• Preferred semi-finished products are pipes.
• housings can be produced with a constant material thickness profile.
• a uniform contact between the housing and the one or more rotor stacks 106 and / or the one or more stator stacks 108 and / or improved electrical insulation can increase and / or increase the efficiency of the electric motor.
• a layer or a layer system which comprises or is formed from at least one ceramic material, is preferably arranged between the housing and the one or more rotor packs 106 and / or the one or more stator packs 108.
• the layer and / or the layer system is preferably thermally conductive and / or electrically insulating.
• bonding at two temperature levels is preferably achieved by using a connecting material which comprises an elastomer material and a resin material, so that in particular a two-stage bonding can be carried out with only one connecting material 110.
• connection material 110 between the metal sheets 112 achieved in a first stage is preferably retained during the second activation 150, in which a plurality of sheet metal laminate units 140 were materially connected to one another.
• Method according to one of the embodiments 1 to 3 characterized in that the plurality of metal sheets (112) which are connected to one another are provided wound up and / or that the one or more metal sheets (112) are unwound for coating with the connecting material (110) become.
• Method according to one of the embodiments 1 to 4 characterized in that before and / or after the cutting of the sheet metal laminate (132) several sheet metal laminate units (140) are stacked along a stacking direction, so that in particular a stack of sheet metal laminate units (140) is created.
• Method according to one of the embodiments 1 to 5 characterized in that the plurality of metal sheets (112) are provided in a pre-coated form, in particular on both sides.
• Method according to one of the embodiments 1 to 6 characterized in that the one or more metal sheets (112) are coated on both sides with the connecting material (110).
• Method according to one of the embodiments 1 to 7, characterized in that a ratio between a thickness of the one or more metal sheets (112) and a layer thickness of the connecting material (110) is in a range from approx. 20: 1 to approx. 250: 1, in particular from approx. 25: 1 to approx. 210: 1.
• the connecting material (110) during the first activation (122) in particular by means of a heating device (126), in particular by means of an infrared heating device (128) is heated.
• Method according to one of the embodiments 1 to 10 characterized in that dividing the sheet metal laminate (132) to produce the plurality of sheet metal laminate units (140) and / or separating the plurality of sheet metal laminate units (140) from the sheet metal laminate (132) by punching (148) he follows.
• Method according to one of the embodiments 1 to 13 characterized in that, in particular after stacking (158) a plurality of sheet stacks (100), the sheet stacks (100) are marked, the marking being carried out in particular by means of a data matrix code and / or by means of laser marking.
• Method according to one of the embodiments 1 to 15 characterized in that a proportion of the elastomer material in a range from approx. 1% by volume to approx. 25% by volume, in particular from approx.
• Method according to one of the embodiments 1 to 16 characterized in that the elastomer material comprises or is formed from a synthetic rubber material, in particular an acrylonitrile-butadiene rubber.
• Method according to one of the embodiments 1 to 20 characterized in that a proportion of the resin material in the connecting material (110) in a range from approx. 1% by volume to approx.
• the connecting substance (110) comprises an adhesion promoter, the adhesion promoter in particular including or being formed from an organically functionalized silane, in particular an aminosilane.
• Machine component in particular a rotor and / or a stator, comprising one or more sheet metal stacks (100), produced by a method according to one of embodiments 1 to 28 and / or including one or more sheet metal stacks (100) according to one of embodiments 29 to 31.
• Electric motor comprising a housing, a rotor and a stator, the rotor and / or the stator being machine components according to embodiment 32.
• a drive train for a vehicle comprising an electric motor according to embodiment 33.

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• 2019
  • 2019-09-09 DE DE102019213658.3A patent/DE102019213658A1/de active Pending
  • 2019-11-26 EP EP19812947.0A patent/EP4029134A1/de active Pending
  • 2019-11-26 CN CN201980101843.1A patent/CN114731099A/zh active Pending
  • 2019-11-26 WO PCT/EP2019/082566 patent/WO2021047788A1/de unknown
• 2022
  • 2022-03-03 US US17/685,819 patent/US12081081B2/en active Active

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