Sheet material and method for manufacturing electromagnetic components, electrical components and electric machines

Abstract

A sheet material for manufacturing electromagnetic components, particularly stator cores or rotor cores, is coated with an adhesive coating comprising a heat-activatable adhesive. The adhesive comprises 60 parts by weight of an epoxy resin in solid form, 0.5 to 15 parts by weight of a latent curing agent, and 1 to 15 parts by weight of a latent accelerator. The present invention also relates to a method for manufacturing electromagnetic components.

Description

Technical Field

[0001] The present invention relates to a sheet material for producing an electromagnetic component, in particular a stator core or a rotor core. Furthermore, the present invention relates to a method for producing an electromagnetic component, in particular a stator core or a rotor core for an electric machine, in particular an electric motor. Background Art

[0002] Various types of electric machines, and in particular the mode of operation of electric motors, have been known for a long time. Electric motors are gaining increasing importance, not only in light of their increasing use in individual private transportation but also in connection with the keyword "electric vehicle." The key components of every electric motor are the stator and rotor, with the term "stator" referring to the stationary part of the motor and the term "rotor" to its moving part.

[0003] A challenge in providing electric motors is to increase the effectiveness of the electric motor, such as the power provided per unit volume and / or efficiency, at an economically reasonable cost.

[0004] One concept for providing a high-efficiency electric motor is to manufacture the stator and / or rotor, or parts of the stator and / or rotor, into a so-called stator core or rotor core. Here, the component, a laminated core (also called a lamination pack), consists of individual laminations. The term "lamination" refers to a molded part, for example, produced by stamping from electrical steel sheets or strips. The lamination pack consists of a plurality of thin laminations stacked on top of one another and partially or preferably completely electrically insulated from one another. For this purpose, the use of so-called electrical insulating varnishes, which are classified into so-called insulation classes, is known in practice.

[0005] The production of such a laminated core always includes the steps of producing the laminations and connecting them to one another. The connection is preferably carried out in such a way that after the connection, the laminations are electrically insulated from one another in sections (preferably completely), i.e. preferably, no two adjacent laminations are electrically connected to one another.

[0006] For example, the production of individual laminae can be achieved by stamping. The stamped laminae can be connected to form a laminated core by various known methods, such as screwing, using clamps, welding, or by stamping and stacking. However, due to the mechanical effects generated during the connection process, each of the aforementioned production methods familiar to those skilled in the art is accompanied by adverse effects on the electromagnetic properties of the finished laminated core that prevail after the connection. During the connection process according to the prior art, mechanical stresses are inevitably unavoidable to at least a certain extent, which can have a negative impact in particular on the magnetic properties and the course of the magnetic flux lines within the laminated core, thereby directly affecting, for example, the performance of the electric motor produced therefrom. The electrical connection between two or more laminae that occurs in some connection methods (such as stamping and stacking or welding) leads to additional losses.

[0007] An excellent possibility for reducing the adverse effects of mechanical action on the lamellae and at the same time achieving good insulation between the lamellae is to use adhesives as a connecting means. These adhesive systems also have insulating properties similar to those of electrical insulating varnishes.

[0008] A treatment method known to those skilled in the art is the use of so-called baking varnish. For example, DE 38 29 068 C1 describes the use of baking varnish for bonding stamped electrical steel sheets. One treatment method using baking varnish involves coating a sheet, particularly a sheet strip; subsequently punching out individual sheets from the sheet; positioning the individual sheets relative to one another in an aligned manner; and subsequently heat-treating the resulting sheet stack for a defined period of time and at a defined temperature. In many cases, the sheets are compressed relative to one another during the heat treatment, for example by applying forces on the end faces, preferably with uniform surface pressure, in the axial direction of the laminated core, pointing toward the interior of the laminated core. Typical reaction temperatures are 150°C to 250°C, and typical baking varnish reaction times are 30 to 150 minutes, followed by a cooling phase. The precise parameters, however, depend on the specific baking varnish used and the specific geometry, as, for example, the core temperature occurring in the component can influence the progress of the baking varnish process. Generally speaking, this treatment method can achieve excellent electromagnetic properties for the stator and / or rotor core. However, due to the time-consuming process, it is immediately apparent that the use of baking varnish is not suitable or at least not optimal for continuous mass production. Summary of the Invention

[0009] Against the background of the described situation, the object of the present invention is to create the prerequisites for the efficient production of laminated cores, ie in particular stator cores or rotor cores, in a mechanized production environment.

[0010] Furthermore, against the background of the desire for further increased efficiency, the present invention is based on the object of providing an electromagnetic component and an electric machine with improved conversion of electromagnetic energy into mechanical energy.

[0011] This object is achieved by a sheet metal for producing an electrical component, in particular a stator core or a rotor core.

[0012] The term "sheet" generally refers to rolled products made of metal materials and, in addition to thin sheets or thick sheets, may also refer in particular to metal strips, metal strips or metal plates made of soft magnetic raw materials, steel strips or electrical steel strips. Alternatively, other sheet production methods may be used.

[0013] The panels are coated with an adhesive coating of a heat-activated adhesive. The adhesive comprises:

[0014] - 60 parts by weight of an epoxy resin in its solid resin form,

[0015] - 0.5 to 15 parts by weight of a latent curing agent,

[0016] - 1 to 15 parts by weight of a latent accelerator.

[0017] Preferably, the adhesive contains 1 to 10 parts by weight of a latent curing agent, particularly preferably 2 to 5 parts by weight of a latent curing agent.

[0018] The term "latent curing agent" refers to a substance which is used for curing epoxy resins but which must be activated, in particular by supplying chemical and / or thermal energy, for curing. The latent curing agent is added to the adhesive as a solid substance in powder form, for example.

[0019] The term "latent accelerator" refers to a substance that accelerates the curing of epoxy resins achieved by latent curing agents. The term "latent" also refers to accelerators, which must be activated by chemical and / or thermal energy in order to function. Latent accelerators are added to adhesives, for example, as solid substances in powder form.

[0020] The composition specified above refers to a mixture of the components present as solids in the specified parts by weight, which constitutes an adhesive mixture, which, in dispersion and / or solution, is converted by a suitable liquid into an adhesive that can form an adhesive coating. The adhesive comprising the specified components is preferably present in a usable state, i.e., in a form suitable for coating, as a dispersion of the composition specified above in a dispersion medium, in particular as an aqueous dispersion.

[0021] Because the provided sheet material includes an adhesive coating made of a heat-activatable adhesive, the adhesive-coated sheet material serves as a semi-finished product for a flexibly adjustable production method for electromagnetic components, particularly stator or rotor cores. Since the adhesive must first be thermally activated, the bonding function can be performed at the desired time or in the desired process step, after the sheets have been removed from the sheet material, for example by punching. Shortly after activation, the sheets must be brought together (optionally, preferably also under partial or full surface pressure in the press and / or in a downstream pressing process) so that they adhere to one another during the chemical curing reaction. Only in this way can a defect-free, delamination-free, geometrically precise, and mechanically stable core be produced.

[0022] The adhesive composition according to the invention allows the board to have a surface with a short activation time of, for example, 0.5 to 1 second and a short hardening time of only a few seconds. These properties are accompanied by relatively high heat resistance and relatively high insulation and aging resistance.

[0023] The epoxy resin present in the adhesive used according to the invention comprises one or more epoxy resin components comprising more than one epoxy group, wherein preferably at least one epoxy resin has a softening point above 50°C.

[0024] The epoxy resin may be an aliphatic, cycloaliphatic or aromatic epoxy resin. Aliphatic epoxy resins contain a component carrying an aliphatic group and at least two epoxy groups.

[0025] Examples of the aliphatic epoxy resin may be butanediol diglycidyl ether, hexanediol diglycidyl ether, diepoxydimethylpentane, diepoxybutylene, diethylene glycol diglycidyl ether thereof.

[0026] Examples of the alicyclic epoxy resins include 3-cyclohexenylmethyl-3-diepoxycyclohexylcarboxylate, 3,4-epoxycyclohexylalkyl-3',4'-epoxycyclohexanecarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3',4'-epoxy-o-methylcyclohexanecarboxylate, diepoxyvinylcyclohexane, di(3,4-epoxycyclohexylmethyl)adipate, diepoxydicyclopentadiene, and 1,2-epoxy-6-(2,3-epoxypropyloxy)hexahydro-4,7-methanoindan.

[0027] Examples of the aromatic epoxy resin include bisphenol A epoxy resin, bisphenol F epoxy resin, phenol novolac epoxy resin, cresol novolac epoxy resin, biphenyl epoxy resin, bisphenol epoxy resin, 4,4′-biphenyl epoxy resin, diepoxydivinylbenzene, 2-glycidylphenyl glycidyl ether, and tetraglycidylmethylenedianiline.

[0028] In a preferred design solution of the present invention, the epoxy resin is bisphenol A epoxy resin.

[0029] As latent curing agent, a substance or a mixture of a plurality of such substances is used which preferably undergoes a curing reaction with the epoxy resin of the adhesive at a temperature in the range of 80° C. to 200° C.

[0030] The curing agent may include dicyandiamide, aziridine derivatives, triazine derivatives, imidazoline, imidazole, o-tolylbiguanide, cyclic amidine, organic hexafluoroantimonate compounds or hexafluorophosphate compounds or BF3-amine complexes. These compounds may be used alone or in combination.

[0031] Examples are 2-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole trimellitate, 1-cyanoethyl-2-phenylimidazole-trimellitate, 2,4-diamino-6-[2'-methylimidazolyl-(1') ]-ethyl-s-triazine, 2,4-diamino-6-[2'-undecylimidazolyl-(1')]-ethyl-s-triazine, 2,4-diamino-6-[2'-ethyl-4'-methylimidazolyl-(1')]-ethyl-s-2,4-diamino-6-[2''methylimidazolyl-(1')]-ethyl-s-triazine, 2-phenylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, 2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole, (1-dodecyl-2-methyl-3-benzyl)imidazolium chloride, 2-methylimidazoline, 2-phenylimidazoline, 2 ,4-diamino-6-vinyl-1,3,5-triazine, 2,4-diamino-6-vinyl-1,3,5-triazine isocyanate adduct, 2,4-diamino-6-methacryloyloxyethyl-1,3,5-triazine, 2,4-diamino-6-methacryloyloxyethyl-1,3,5-triazine isocyanate adduct, 1,3,5-triazine, 2,4-diamino-6-methyl-1,3,5-triazine, 2,4-diamino-6-nonyl-1,3,5-triazine, 2,4-diamino-6-phenyl-1,3,5-triazine, 2,4-dimethoxy-6-methyl-1,3,5-triazine, 2,4-dimethoxy -6-phenyl-1,3,5-triazine, 2-amino-4,6-dimethyl-1,3,5-triazine, 2-amino-4-dimethylamino-6-methyl-1,3,5-triazine, 2-amino-4-ethoxy-6-methyl-1,3,5-triazine, 2-amino-4-ethyl-6-methoxy-1,3,5-triazine, 2-amino-4-methoxy-6-methyl-1,3,5-triazine, 2-amino-4-methyl-6-phenyl-1,3,5-triazine, 2-chloro-4,6-dimethoxy-1,3,5-triazine, 2-ethylamino-4-methoxy-6-methyl-1,3,5-triazine, 1-o-tolylbiguanide.

[0032] In a preferred embodiment of the present invention, the accelerator comprises a urea derivative and / or imidazole.

[0033] In addition, the adhesive composition according to the present invention may further comprise other components.

[0034] In a preferred design of the present invention, the curing agent comprises dicyandiamide, imidazole, BF3-amine complex or a combination thereof.

[0035] In one embodiment, the adhesive may contain 1 to 10 parts by weight of a latent accelerator, preferably 1 to 5 parts by weight of a latent accelerator, particularly preferably 2 to 5 parts by weight of a latent accelerator, and particularly preferably 2 to 4 parts by weight of a latent accelerator.

[0036] In another preferred embodiment, the adhesive further comprises 0.2 to 8 parts by weight, preferably 0.2 to 4 parts by weight, of an absorbing additive. According to this further development, the absorbing additive can be selected from the group of lamp blacks (flame blacks) and / or the group of water-soluble pigments.

[0037] The term "absorbing additive" refers to a substance that absorbs thermal radiation. Substances that absorb thermal radiation have the advantage, in particular, of enabling more efficient use of methods in which thermal activation of the adhesive is achieved by means of electromagnetic radiation, in particular by irradiation with light in the IR wavelength range, preferably in the NIR wavelength range.

[0038] Preferably, the adhesive contains one or more insulating additives known to those skilled in the art, wherein the term "insulating additive" refers to an additive specifically provided to increase the electrical resistance of the adhesive. The insulating additive can be included in the adhesive in an amount of 1 to 10 parts by weight, preferably 1 to 5 parts by weight.

[0039] The latent accelerator contained in the adhesive preferably consists of at least 50 wt.%, more preferably at least 90 wt.%, and more preferably completely of a urea derivative.

[0040] Particularly preferably, the urea derivative is N,N-dimethylurea or N,N′-dimethylurea or a bifunctional urea derivative preferably comprising two urea groups as functional groups, specifically 4,4′-methylenebis(phenyldimethylurea), or a mixture of a plurality of the above.

[0041] The latent accelerator contained in the adhesive preferably consists of at least 50 wt.%, more preferably at least 90 wt.%, more preferably at least 98 wt.% of 4,4′-methylenebis(phenyldimethylurea), and very preferably consists entirely of it.

[0042] In one alternative, the present invention uses a urea derivative in which at least one, preferably two, and particularly preferably three hydrogen atoms are independently replaced by alkyl and / or phenyl groups, each of which may be substituted. Preferably, the alkyl group is a methyl, ethyl, propyl, or butyl group, preferably a methyl group; the phenyl group is a phenyl group or one of the aforementioned alkyl groups, preferably substituted in position 4, also preferably a combination of the aforementioned alkyl groups. In another alternative, the present invention includes a difunctional urea derivative as a derivative described above, which contains two functional groups. The urea group is an atomic group that significantly determines the properties of the substance and, in particular, the reaction behavior of the compound, particularly the reaction with the functional group. Furthermore, the urea derivative used according to the present invention is halogen-free. In one alternative, the urea derivative used according to the present invention contains two urea derivatives as functional groups. Advantageously, this allows epoxy resins to be cured without the presence of dicyanamide as a crosslinking agent.

[0043] In an alternative, asymmetrically substituted ureas are also used as urea derivatives, or only asymmetrically substituted ureas are used.

[0044] In another alternative, mixtures of two, three or more of the foregoing are used.

[0045] As a urea derivative, a substance can also be preset

[0046]

[0047] Where R is hydrogen or according to

[0048] groups, in which

[0049] n = 0 or 1, preferably 1,

[0050] X = O or S, preferably O,

[0051] R1, R2 and R3 are independently hydrogen, halogen, nitro, substituted or unsubstituted alkyl, alkoxy, aromatic or aryloxy,

[0052] R4 is an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aralkyl group optionally substituted by halogen, a hydroxyl group or a cyano group, preferably a methyl group, an ethyl group, a propyl group or a butyl group, particularly preferably a methyl group, R5 is such as R4 or an alkoxy group, R5 optionally forms a heterocycle with R4,

[0053] or N,N-dimethyl-N'-(3,4-dichlorophenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-methyl-phenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-methoxyphenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-ethylphenyl)urea, or N,N-dimethyl-N'-(4-methyl-3-nitrophenyl)urea, or N-(N'-3,4-dichlorophenylcarbamoyl)morpholine, or N,N-dimethyl-N'-(3-chloro-4-methylphenyl)thiourea;

[0054] Preferably, the urea derivative is 4,4'-methylenebis(phenyldimethylurea);

[0055] Or it may be a mixture of two, three or more of the aforementioned. This mixture preferably contains at least 10%, 25%, preferably 50%, 60%, 70%, 80% or 90% 4,4'-methylenebis(phenyldimethylurea). The advantages of this urea derivative are derived from GB 1293142 A discovered by the inventors, and this derivative can be used prominently in the manufacture of electromagnetic components.

[0056] The urea derivative may be a mixture of a plurality of the aforementioned urea derivatives.

[0057] The average particle size (arithmetic mean) of the urea derivative is preferably between 1 μm and 30 μm.

[0058] It can be provided that the adhesive coating is applied to the sheet material on one side or on both sides. If the adhesive coating is applied on both sides, the thickness of the coating can be the same, but different thicknesses can also be provided.

[0059] The application of the adhesive to the sheet material can be achieved by means of known methods, in particular by means of coil coating (roll-to-roll).

[0060] The preferred adhesive coating thickness, i.e., the coating thickness on one side in the case of a single-sided adhesive or the total thickness of the adhesive coatings on both sides in the case of a double-sided adhesive coating, is between 1 μm and 20 μm, preferably between 2 and 10 μm. Particularly preferably, the total thickness is between 4 and 8 μm.

[0061] While one-sided adhesive coating of the sheet metal is associated with simpler production in the device, double-sided adhesive coating of the sheet metal is associated with the advantage that, during the mutual positioning of the individual sheets produced from the sheet metal, the adhesive surface is positioned on the adhesive surface, thereby achieving improved adhesion and thus greater mechanical stability of the electromagnetic component, as has been demonstrated in tests and will be explained further below.

[0062] Particularly preferably, the first sub-coating on the first sheet surface and the second sub-coating on the second sheet surface of the second thickness are adapted to each other such that the first thickness is at least 1.5 times, and preferably twice, the second thickness. In this configuration, the first thickness ensures excellent insulation, making the risk of adhesive gaps virtually eliminated, while the thinner of the two coatings, i.e., the second sub-coating applied at the second thickness, primarily contributes to excellent adhesion.

[0063] Particularly preferably, the total thickness of the two coats of the double-sided coating is between 4 and 6 micrometers. Such low coating thicknesses are possible due to the high reactivity of the adhesive used according to the invention or its developments, as demonstrated in the resulting examples. Known baking varnish adhesives typically require coating thicknesses exceeding 6 micrometers (e.g., 5 µm per side for double-sided baking varnish). This results in the advantage that, based on the sheet material according to the invention or its developments, components, in particular stators or rotors, can be produced that have a significantly higher iron filling factor than components produced using baking varnish methods. This has the advantage of higher efficiency of the electric motor containing such components. However, a total adhesive coating of between 1 and 20 micrometers, preferably between 2 and 8 micrometers, can be provided.

[0064] In a further alternative, an insulating varnish layer is arranged between the sheet metal and the adhesive layer and / or only the insulating varnish is arranged on the side opposite the adhesive layer.

[0065] Particularly preferably, the sheet is designed as non-grain-oriented electrical steel strip, also referred to as so-called NO-electrical steel strip, or is separated from such electrical steel strip, wherein, in addition to Fe and unavoidable impurities, the non-grain-oriented electrical steel strip also contains the following elements (all data in wt.%):

[0066] 0.1 to 3.50 Si,

[0067] 0.01 to 1.60 Al,

[0068] 0.07 to 0.65 Mn,

[0069] Optionally, a P of up to 0.25.

[0070] It is understood that the sum of all alloying components and impurities complements 100 wt.%.

[0071] Particularly preferably, the following conditions are observed (all data are in wt.%):

[0072] Si from 2.3 to 3.40,

[0073] 0.3 to 1.1 Al,

[0074] 0.07 to 0.250 Mn,

[0075] Optionally, up to 0.030% P, with the remainder being Fe and unavoidable impurities.

[0076] It is understood that the sum of all alloying components and impurities complements 100 wt.%.

[0077] Preferably, the non-grain-oriented electrical steel strip or non-grain-oriented sheet has specific hysteresis losses in the range of 0.7 to 7 W / kg at P1.0 / 50 Hz and in the range of 1.8 to 15 W / kg at P1.5 / 50 Hz, determined in accordance with DIN EN 60404-2, and / or a polarization strength in the range of 1.45 T to 1.71 T at J2500 and in the range of 1.6 T to 1.8 T at J5000.

[0078] In a preferred embodiment, the non-grain-oriented electrical steel strip or non-grain-oriented sheet has specific hysteresis losses in the range of 0.8 to 3.5 W / kg at P1.0 / 50 Hz and in the range of 1.9 to 8.0 W / kg at P1.5 / 50 Hz, and / or a polarization strength in the range of 1.47 to 1.71 T at J2500 and in the range of 1.58 to 1.80 T at J5000, determined in accordance with DIN EN 60404-2.

[0079] In another preferred embodiment, the non-grain-oriented electrical steel strip or non-grain-oriented sheet has specific hysteresis losses in the range of 1.0 to 1.5 W / kg at P1.0 / 50 Hz and in the range of 2.2 to 3.3 W / kg at P1.5 / 50 Hz, and / or a polarization strength in the range of 1.47 to 1.57 T at J2500 and in the range of 1.58 to 1.65 T at J5000, determined in accordance with DIN EN 60404-2.

[0080] Preferably, the non-grain-oriented electrical steel strip or non-grain-oriented sheet has, measured according to DIN EN 60404-2, specific hysteresis losses in the range of 8 to 120 W / kg at P1.0 / 400 Hz; specific hysteresis losses in the range of 18 to 360 W / kg at P1.5 / 400 Hz; and / or a polarization strength in the range of 1.45 T to 1.75 T at J2500, a polarization strength in the range of 1.45 T to 1.85 T at J5000, and a polarization strength in the range of 1.50 to 1.95 T at J10000.

[0081] In another preferred embodiment, the raw material has specific hysteresis losses in the range of 10 to 25 W / kg at P1.0 / 400 Hz; specific hysteresis losses in the range of 25 to 49 W / kg at P1.5 / 400 Hz; and / or a polarization strength in the range of 1.45 T to 1.75 T at J2500, a polarization strength in the range of 1.45 T to 1.85 T at J5000, and a polarization strength in the range of 1.50 to 1.95 T at J10000, as determined in accordance with DIN EN 60404-2.

[0082] Preferably, the non-grain-oriented electrical steel strip or non-grain-oriented sheet has a yield strength of 190 to 610 MPa, a maximum tensile strength of 310 to 740 MPa and an A80 minimum elongation at break of 6 to 48% in the longitudinal direction under standard conditions, measured according to DIN EN ISO 6892-1, and an Hv5 hardness of 100-250.

[0083] In a particularly preferred embodiment, the raw material has a yield strength of 310 to 600 MPa, a maximum tensile strength of 400 to 640 MPa and an A80 elongation at break of 7 to 32% in the longitudinal direction at room temperature, measured in accordance with DIN EN ISO 6892-1, and an Hv5 hardness of 130-250.

[0084] Preferably, the material has an anisotropy at P1.0 / 400 Hz in the range of 5 to 17%.

[0085] Alternatively, a sheet material made of a soft magnetic raw material with the following alloy composition can be provided:

[0086] Iron, in addition to Fe and unavoidable impurities, consists of the following elements (all data are in wt.%):

[0087] 0.1 to 4.0 Si,

[0088] 0.01 to 2.60 Al,

[0089] 0.07 to 3.0 Mn,

[0090] Optionally, a maximum of 0.5 P,

[0091] Optionally, up to 0.015 B,

[0092] Optionally, up to 0.2% Sb,

[0093] Optionally, up to 0.01% Zn,

[0094] Optionally, up to 5 Cr,

[0095] Optionally, up to 5 Ni,

[0096] Optionally, up to 0.25 V,

[0097] Optionally, up to 0.5% Sn,

[0098] Optionally, up to 0.01 As,

[0099] Optionally, up to 0.3% Nb,

[0100] Optionally, up to 0.5 W,

[0101] Optionally, up to 0.85% Zr,

[0102] Optionally, up to 0.2% Mo,

[0103] Optionally, up to 1.0 Cu,

[0104] Optionally, up to 0.5 Ti,

[0105] Optionally, a maximum of 0.5 C,

[0106] Optionally, up to 0.01 Ce.

[0107] Suitable and preferred methods are to use sheet metal, in particular electrical steel strip, with a thickness between 0.05 and 2.5 mm, preferably a thickness between 0.1 and 1.0 mm. Particularly preferably, a thickness between 0.15 and 0.4 mm is used.

[0108] Alternatively, the sheet material can be a multilayer composite (sandwich structure) consisting of sheet material layers (e.g., one of the electrical steel strips described above) and one or more additional layers, including, for example, a functional acoustic damping layer (e.g., Bondal E). Furthermore, the sheet material can also be coated on one or both sides with a functional acoustic damping layer (e.g., Halb-Bondal E), with the described adhesive system being directly bonded to the functional acoustic damping layer (e.g., chemically based on acrylates). Epoxy resin systems are known to have good compatibility.

[0109] Alternatively, the plate can have an acoustically damping functional layer on one side and an adhesive layer to be used according to the invention on the opposite plate side.

[0110] Tests have shown that the provision of a sheet metal according to the invention or one of its developments allows excellent bonding of sheet metal sheets with maximum adhesive reactivity. This has the additional advantage of providing suitable methods that also make it possible to produce laminated cores in a linear production process with a high number of pieces per unit time. These tests will be further discussed below as examples.

[0111] The sheet metal provided according to the invention makes it possible to produce laminated cores for electric motors in a particularly advantageous manner, since, according to the developers' knowledge, for the first time a raw material prepared for further processing is available which can be used economically both in an online process (i.e. in a continuous processing process) and in an offline process (i.e. for paint bonding).

[0112] In addition to this particularly advantageous combination of properties, it has surprisingly been shown that the sheet metal provided according to the invention is also long-term stable. This means, in particular, that, in conjunction with the possibility of in-line production of laminated cores, the sheet metal provided according to the invention meets the basic requirements for integration into typical production methods in the automotive industry, as the long-term stability not only allows for storage over longer periods, at least up to several weeks, but also, due to the temperature stability, enables processing for just-in-time delivery, which is typically also achieved in unheated trucks in the middle of summer, where temperatures of at least 40°C must be withstood for extended periods.

[0113] A further advantage of the sheet material provided according to the invention is that it is mechanically stable, ie in particular the adhesive remains dimensionally stable during compression, in contrast to the adhesives currently used in the initially mentioned baking varnishing method.

[0114] Furthermore, as demonstrated by the examples explained below, the adhesion is temperature-stable. Unlike conventional baking varnish systems, the so-called squeezing of the adhesive system during the compression process does not occur or is only greatly reduced.

[0115] The targeted combination of sheet metal for use in electric vehicles (in one refinement, specifically selected sheet metal) with a specifically chosen adhesive composition provides a hitherto unknown combination of properties: the ability to produce laminated cores and electromagnetic components on a large industrial scale, not only for the automotive industry. This offers a previously unknown flexibility to those skilled in the art who are familiar with the implementation of the present invention.

[0116] For example, the possibility of alternative sheet metal options and the increased structural freedom in thin-film design offer potential advantages for electromagnetic, mechanical, and thermal motor design, as well as advantages with regard to possible component tolerances and media and / or heat conduction. Further advantages arise in component and motor production (e.g., when dealing with compact and robust components) and in mechanical processing. Further advantages of a motor that includes one of the sheet metals according to the invention or one of its developments include: higher power and efficiency, reduced required installation space, improved geometric properties (e.g., achievable, in particular, with constant surface pressure by means of recompression against a stop, resulting in improved dimensional accuracy of the electromagnetic component), and design-dependent acoustic advantages.

[0117] Another aspect of the present invention relates to a method for producing an electromagnetic component. The electromagnetic component may be, in particular, a laminated core for an electrical machine, preferably an electric motor. The laminated core is preferably either a stator core or a rotor core, i.e., a stator or a portion of a stator, or a rotor or a portion of a rotor.

[0118] The method comprises the following steps:

[0119] A) In a first step, a sheet material according to the invention or a development thereof is provided. The sheet material can be, for example, an electrical steel strip or a slab separated from a sheet material strip.

[0120] B) The sheet is transported to an online facility. The online facility comprises at least the following stations: a punching tool, a device for emitting infrared radiation, and an extrusion punch.

[0121] The term "online facility" means that a plurality of processing stations, ie at least those mentioned above, are arranged in a predetermined sequence and that sheet materials, such as electrical steel strips, introduced into the online facility are processed automatically and sequentially in the predetermined stations.

[0122] The punching tool is a tool that punches out thin sheets from a sheet, preferably punching out more than one sheet (e.g., four) simultaneously. In step C), the sheet is punched out using the punching tool, preferably in such a way that a plurality of connecting tabs, e.g., three connecting tabs, remain between the individually punched thin sheets and the sheet to be transported to the in-line facility. This ensures that the punched thin sheets remain a single-piece component of the sheet. This serves to enable the thin sheets to be transported further through the in-line facility together with the sheet (in particular, a sheet strip).

[0123] In the above context, the term "sheet" refers to a molding which is obtained by separation from a sheet material, in particular by punching.

[0124] In a preferred alternative, an electromagnetic component (preferably a rotor core) is manufactured using a conventional lamination process, such as stamping lamination, and another electromagnetic component, preferably a stator core for an electric machine identical to the conventionally manufactured stator core, is manufactured using the method according to the invention described above. This can be accomplished, for example, in a combined method or sequentially. Preferably, prior to lamination, a stress relief annealing or recrystallization annealing may be performed, and optionally, a coating step, an activation step, and / or an inspection step may also be performed. In this context, the activation step refers to the activation of the adhesive used.

[0125] The device for emitting infrared radiation can in particular be designed as an NIR emitter, ie a light-emitting device designed to emit electromagnetic radiation in the NIR wavelength spectrum, ie electromagnetic radiation with a wavelength between 780 nm and 3 μm.

[0126] In a preferred method implementation, the irradiation of the molded part is carried out in the NIR wavelength range, preferably using wavelengths between 0.8 μm and 1.2 μm, and particularly preferably achieving a maximum luminous power with NIR radiation having a wavelength between 0.85 μm and 0.9 μm.

[0127] Activation (irradiation) is only carried out within the area of ​​the coating surface that is available (active) for bonding. The remaining area is shielded with a masking sheet so that only the required areas are activated (supplementary diagram). By overactivating the individual sheets, the individual laminated cores are separated at the achieved structural height, so that they are no longer active and therefore no longer bond.

[0128] Furthermore, as mentioned, the in-line facility has an extrusion punch. This extrusion punch is a punch that sequentially separates sheets that are still connected to the sheet (in particular a sheet strip) via one or more webs from the sheet by cutting one or more webs, using a force acting perpendicularly to the sheet surface, and preferably in the same process step, conveys the sheets to a receiving device arranged below the sheet, where they are collected.

[0129] The electrical component, in particular a molded part designed as a stator lamination or rotor lamination, is punched out of the sheet metal provided in step A) in an online facility by means of a punching tool, wherein preferably one or more (in particular three) tabs have a connection to the sheet metal that is sufficient for further transport of the molded part.

[0130] D) Subsequently, the adhesive coating of the molded part formed in step C) is irradiated with infrared radiation by means of an infrared radiation device in order to activate the adhesive coating. In other words, a temperature sufficient for activation is induced in the sheet material and in particular in the adhesive, for example by irradiation at an emission power of between 5 and 10 kW for a period of between 0.5 and 1 second, which is sufficient for an activation temperature in the adhesive of between 100°C and 250°C.

[0131] The molded parts are extruded by means of an extrusion punch and, preferably in the same movement, are introduced into a receiving device having a positioning area therein. The positioning area facilitates the positional and / or angular positioning of the molded parts respectively dropped therein relative to the molded parts already located in the positioning area, so that a stack of molded parts oriented with respect to one another and provided with activated adhesive is ultimately obtained.

[0132] The positioning region can be, for example, a cylindrical tube located below the conveying plane of the molded parts, so that after extrusion, the molded parts fall due to gravity onto the already existing stack of molded parts. The molded parts are oriented by the positioning region, which is designed, for example, as a cylindrical hollow tube with an outer cross-section that essentially corresponds to the cross-section of the molded parts and is aligned therewith in a predetermined orientation.

[0133] Steps C) to E) are repeated as many times as desired until the desired number of molded parts is in the positioning area and a molded part stack is formed. Particularly preferably, the punching tool and the extrusion punch are components of the same press, which has the advantage that the punching and extrusion processes are highly synchronized.

[0134] Particularly preferably, the means for emitting infrared radiation are arranged between the punching tool and the extrusion punch and include: at least one upper illuminant pointing toward the first sheet metal surface in the punching direction; at least one lower illuminant located opposite the side of the sheet metal on which the punching tool is located and against which the lower illuminant points; or both at least one upper illuminant and at least one lower illuminant. The illuminants do not necessarily need to be oriented at right angles to the sheet metal surface; they can also be oriented at other angles.

[0135] In particular, in the presence of an upper and a lower luminaire, it is possible to activate the adhesive in a particularly suitable manner both on the first sheet side and on the opposite second sheet side, with the advantageous result that excellent adhesion of the sheets to one another can be expected.

[0136] According to a particularly preferred development of the method, the resulting laminated core is subsequently pressed after the last molded part has been positioned with the desired number of molded parts. The pressing step is carried out by pressing the laminated core in the axial direction of the laminated core with uniform surface pressure on the end faces. This pressing achieves particularly good adhesion between the individual molded parts, which thus contributes to the durability of the laminated core. The subsequent pressing step is preferably carried out outside the press, in a downstream pressing station. Alternatively, however, the pressing step can also be carried out by pressure (preferably partial or full surface) from an extrusion punch in a stamping tool.

[0137] Preferably, steps C) to E) are carried out with a stroke rate of at least 80 / min, preferably at least 100 / min, particularly preferably at least 120 / min and / or at most 1000 / min, preferably at most 300 / min, particularly preferably at most 220 / min. That is, in the positioning area, a number of molded parts corresponding to the number of strokes is introduced within one minute.

[0138] An alternative method provides that, after providing one or more sheets (preferably electrical steel strips), a number of molded parts are stamped from the sheets provided in step A) in a stamping tool in step B). The molded parts are then positioned so that they overlap and / or are angularly aligned. These molded parts are then pressed in a separate station, which can be designed as an oven, for example, and heated to a predetermined temperature or a temperature within a predetermined temperature range within a predetermined time period. This process is similar to the process known from the initially described baking method, but differs in the raw material used, which is specifically one of the materials mentioned above. Only with materials of the type mentioned above can long-term storage be achieved while simultaneously providing a predetermined number of finished laminated cores per unit time, resulting in the method being well-suited for mass production.

[0139] The predetermined time period is preferably between 10 and 60 minutes, particularly preferably between 10 and 40 minutes. With sheet metal of the type described above used according to the invention, this time period is entirely sufficient to produce a finished laminated core. The predetermined temperature is particularly preferably between 100°C and 200°C, in particular between 100°C and 150°C. In laboratory tests, samples were successfully produced, for example, at a predetermined temperature of 120°C and a predetermined time period of 30 minutes. This example also demonstrates one of the advantages of the method according to the invention over conventional baking methods, where higher temperatures and longer time periods are common, such as annealing at 190°C for 60 minutes. This is due to the successful provision of sheet metal containing adhesives that are significantly more reactive than currently used adhesives. The practically necessary bonding parameters (time / pressure and temperature) are significantly influenced by the specific geometry, as, for example, the core temperature occurring in the component influences the course of the bonding method.

[0140] It can be provided that after the method for producing the laminated core is completed, its edges are cleaned in order to remove any adhesive residues on the edges of the laminated core or on the sides of the laminated core. The cleaning can be achieved chemically and / or mechanically.

[0141] In order to increase the strength of the adhesive layer, it can be provided that inorganic and / or organic fibers are arranged in the adhesive coating.

[0142] An electric machine having electrical components produced in the manner according to the invention can be used as an electric motor, for example in passenger cars, trucks, motor bikes, small electric cars, airplanes or drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0143] Advantages and features of the subject matter according to the invention are apparent from the description based on the accompanying drawings.

[0144] Figure 1a Shows the shear value test results of samples stored at room temperature;

[0145] Figure 1b Shows the shear value test results of samples stored at 40 degrees Celsius;

[0146] Figure 2a A schematic diagram illustrating one embodiment of a method of manufacturing a laminated core for an electric machine; and

[0147] Figure 2b A schematic diagram shows another exemplary embodiment of a method for a laminated core of an electric machine. DETAILED DESCRIPTION

[0148] Example

[0149] Examples of sheets according to the invention and their advantageous properties for the method according to the invention were obtained from the tests carried out.

[0150] The following samples were manufactured:

[0151] Slabs from electrical steel strip M800-50A (according to EN 10027-1) with a raw material property value of 1.0816 (according to EN 10027-2), a thickness of 0.5 mm and a length × width of 200 × 150 mm.

[0152] Samples 0, 1, 2 and 3 were produced. Samples 0, 1 and 2 were control samples coated with an adhesive not according to the invention.

[0153] Sample 3 is a sample according to the present invention.

[0154] The samples produced were slabs of the type described above, which were coated with adhesive by means of a coating roller according to the following parameters:

[0155]

[0156] Layer thickness

[0157] Sample 0: First surface: 6 µm, Second surface: 0 µm,

[0158] Sample 1: First surface: 6 µm, Second surface: 0 µm,

[0159] Sample 2: First surface: 4 µm, Second surface: 2 µm,

[0160] Sample 3: First surface: 4 µm, second surface: 2 µm.

[0161] Multiple specimens were made for each sample type. To test long-term stability, 18 sandwich structures were fabricated from two identical samples.

[0162] Two identical samples were bonded using a sheet press with a surface pressure of 3 N / mm² on a 200 mm × 200 mm sheet. The adhesive was activated in an oven by heating to 120°C and holding at 120°C for 30 minutes. The eight samples were then placed in an oven and stored at 40°C. Every week, one sample was removed and subjected to a shear value test (according to DIN EN 1465). In addition, a shear value test was performed once a week on samples stored at room temperature. The test results are shown in the table below. Figure 1a and Figure 1b middle.

[0163] As can be seen from the results, at room temperature, the shear values ​​of the composition used according to the present invention are superior to the shear values ​​of the reference samples, i.e., sample 0, sample 1, and sample 2. Sample 0, tested after six weeks, has a significantly reduced shear value, and after 8 weeks, the shear value of sample 0 is 0.

[0164] In the reference sample, Sample 0, storage at 40°C resulted in a shear value of 0 after at least one week, so this sample did not have any storage stability at 40°C. After two weeks, Samples 1 and 2 had good, almost unchanged shear values ​​of over 7.0 N / mm², but after three weeks of storage, this began to deteriorate significantly.

[0165] In all cases, the shear values ​​for Sample 2, which includes a double-sided painted surface, are higher than the shear values ​​for Sample 1, which includes a single-sided painted surface.

[0166] In particular, it can be seen that Sample 3 has the best storage stability, with good shear values ​​remaining virtually unchanged after four weeks of storage at 40°C. A slab sandwich structure was the only sample available that also exhibited good shear values ​​that remained unchanged after four weeks of storage at 40°C. At the time of filing, the trials were still ongoing.

[0167] In addition, tests were carried out on the finished sandwich structures, wherein these were heated to the test temperature and then, after a short holding time, likewise subjected to a shear value test under heat.

[0168]

[0169] The results show that both samples 2 and 3 can withstand temperatures up to 200°C for a certain period of time without losing their mechanical stability. However, it is particularly evident that the shear value of sample 3 is significantly higher than that of the control sample 2.

[0170] For reference, sample 0 was subjected to a temperature test, which showed that after heating to 150° C., a shear value of approximately 0.90 N / mm² was achieved. Based on sample 3, this shows that the sheet metal according to the invention is suitable for producing laminated cores with a higher temperature stability than known sheet metals.

[0171] An example of a first embodiment of a method suitable for producing a laminated core for an electric motor is shown in Figure 2bIn the process, a sheet material already coated with plastic, more precisely, a non-grain-oriented electrical steel strip 1, is provided. This is transported to the inline facility. In the first station, a number of extrusion punches 4 ensure the extrusion of molded parts 2 designed as rotor or stator laminations. In a downstream station, the molded parts are irradiated with the aid of an apparatus 5 designed as an NIR emitter for emitting infrared radiation, and the resulting heating activates the adhesive coating of the molded parts. Subsequently, the molded parts are extruded using an extrusion punch 6 and collected in a positioning area in a positionally and / or angularly oriented manner to form a stack 3. Finally, in a pressing station, pressing is carried out using a pressing punch 7 until the adhesive hardens and the finished laminated core can be removed.

[0172] Figure 2b A production method can be seen in FIG, which is similar to the known baking varnish method. Figure 2b Methods and Figure 2a The method differs in particular in that the extrusion of the molded part 2 and the formation of the stack 3 are carried out before the activation of the adhesive coating. Finally, the adhesive is activated in an oven 8, for example at a temperature between 100° C. and 200° C., while the sample is pressed with the aid of a punch 7.

Claims

1. A sheet material for manufacturing electromagnetic components, wherein the sheet is coated with an adhesive coating of a heat-activatable adhesive, wherein the adhesive comprises: 60 parts by weight of epoxy resin in solid resin form, 0.5 to 15 parts by weight of a latent curing agent, 1 to 15 parts by weight of a latent accelerator, in, The adhesive coating is applied to the plate on both sides, and the total thickness of the adhesive coating is between 2 μm and 8 μm, wherein the adhesive coating is composed of a first sub-coating having a first thickness on the surface of the first sheet material and a second sub-coating having a second thickness on the surface of the second sheet material, and Wherein, the first thickness is at least 1.5 times the second thickness.

2. The plate according to claim 1, characterized in that The adhesive comprises: 1 to 10 parts by weight of a latent curing agent.

3. The plate according to claim 1 or 2, characterized in that The epoxy resin is bisphenol A epoxy resin.

4. The plate according to claim 1 or 2, characterized in that The latent curing agent comprises dicyandiamide, imidazole, BF3-amine complex or a combination thereof.

5. The plate according to claim 1 or 2, characterized in that The adhesive comprises: 1 to 10 parts by weight of a latent accelerator.

6. The plate according to claim 1 or 2, characterized in that The adhesive further comprises 0.2 to 8 parts by weight of an absorbing additive selected from the group of lamp blacks and / or the group of water-soluble pigments.

7. The plate according to claim 1 or 2, characterized in that: The latent accelerator comprises a urea derivative.

8. The plate according to claim 7, characterized in that The urea derivative is N,N-dimethylurea or N,N'-dimethylurea or a difunctional urea derivative, or a mixture of more than one of N,N-dimethylurea, N,N'-dimethylurea and a difunctional urea derivative.

9. The plate according to claim 7, characterized in that Asymmetrically substituted ureas are also used as urea derivatives.

10. The plate according to claim 7, characterized in that Only asymmetrically substituted ureas were used as urea derivatives.

11. The plate according to claim 7, characterized in that The urea derivative is the following Where R is hydrogen or according to groups, in which n = 0 or 1, X = O or S, R1, R2 and R3 are independently hydrogen, halogen, nitro, substituted or unsubstituted alkyl, alkoxy, aromatic or aryloxy, R4 is an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aralkyl group, a hydroxyl group or a cyano group, R5 is the same as R4 or is an alkoxy group, or N,N-dimethyl-N'-(3,4-dichlorophenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-methyl-phenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-methoxyphenyl)urea, or N,N-dimethyl-N'-(3-chloro-4-ethylphenyl)urea, or N,N-dimethyl-N'-(4-methyl-3-nitrophenyl)urea, or N-(N'-3,4-dichlorophenylcarbamoyl)morpholine, or N,N-dimethyl-N'-(3-chloro-4-methylphenyl)thiourea, Or it may be a mixture of two, three or more of the aforementioned.

12. The plate according to claim 11, characterized in that R4 is an aralkyl group substituted with halogen.

13. The plate according to claim 11, characterized in that R5 and R4 form a heterocyclic ring.

14. The plate according to claim 7, characterized in that The average particle size of the particles of the urea derivative is between 1 μm and 30 μm.

15. The plate according to claim 1 or 2, characterized in that An insulating varnish layer is arranged between the plate and the adhesive layer, and / or only an insulating varnish is arranged on the side of the plate opposite the adhesive layer.

16. The plate according to claim 1, wherein The sheet material is electrical steel strip.

17. The plate according to claim 16, wherein, in addition to Fe and unavoidable impurities, the plate further comprises the following, all data being in wt.%: 0.1 to 3.50 Si, 0.01 to 1.60 Al, 0.07 to 0.65 Mn.

18. The plate according to claim 16, characterized in that In addition to Fe and unavoidable impurities, the plate consists of the following, all data are in wt.%: 0.1 to 3.50% Si, 0.01 to 1.60 Al, 0.07 to 0.65 Mn, Maximum P of 0.

25.

19. The plate according to claim 1 or 2, characterized in that The plate material is a soft magnetic metal material.

20. The sheet material according to claim 16, Its thickness together with the adhesive coating is between 0.05 mm and 2.5 mm.

21. The board according to claim 17 or 18, wherein the board is a sandwich structure or a board coated with an acoustic damping functional layer on one side or both sides.

22. The sheet material according to claim 1, wherein The electromagnetic component is a stator core or a rotor core.

23. The sheet material according to claim 1, wherein The adhesive comprises: 2 to 5 parts by weight of a latent curing agent.

24. The plate according to claim 1 or 2, characterized in that The adhesive comprises: 1 to 5 parts by weight of a latent accelerator.

25. The plate according to claim 1 or 2, characterized in that The adhesive comprises: 2 to 5 parts by weight of a latent accelerator.

26. The sheet material according to claim 8, characterized in that The bifunctional urea derivative is a bifunctional urea derivative including two urea groups as functional groups.

27. The sheet material according to claim 8, characterized in that The bifunctional urea derivative is 4,4'-methylenebis(phenyldimethylurea).

28. The sheet material according to claim 11, wherein R4 is methyl, ethyl, propyl or butyl.

29. The sheet material according to claim 1, wherein The total thickness of the adhesive coating is between 4 µm and 6 µm.

30. The sheet material according to claim 1, wherein The first thickness is twice the second thickness.

31. The sheet material according to claim 16, wherein The sheet is a non-grain-oriented electrical steel strip or is separated from a non-grain-oriented electrical steel strip.

32. The sheet material according to claim 17, wherein In addition to Fe and unavoidable impurities, the plate is composed of the following, all data are in wt.%: Si from 2.3 to 3.40, 0.3 to 1.1 Al, 0.07 to 0.250 Mn.

33. The sheet material according to claim 17, wherein In addition to Fe and unavoidable impurities, the plate is composed of the following, all data are in wt.%: Si from 2.3 to 3.40, 0.3 to 1.1 Al, 0.07 to 0.250 Mn, The highest P is 0.

030.

34. The sheet material according to claim 19, wherein In addition to Fe and unavoidable impurities, it is composed of the following, all data are in wt.%: 0.1 to 4.0 Si, 0.01 to 2.60 Al, 0.07 to 3.0 Mn.

35. The plate material according to claim 19, characterized in that, in addition to Fe and unavoidable impurities, it is composed of the following, all data are in wt.% units: 0.1 to 4.0 Si, 0.01 to 2.60 Al, 0.07 to 3.0 Mn, and At least one of the following: The highest P is 0.5, The highest B is 0.015, Sb up to 0.2, Maximum 0.01% Zn, The highest Cr is 5, The highest Ni is 5, Maximum V of 0.25, Sn up to 0.5, As up to 0.01, Nb up to 0.3, Maximum 0.5W, The highest Zr is 0.85, The highest Mo is 0.2, Maximum 1.0 Cu, The highest Ti is 0.5, The highest C is 0.5, Maximum 0.01 Ce.

36. The sheet material according to claim 16, The thickness of the sheet material including the adhesive coating is between 0.15 mm and 0.4 mm.

37. A method for manufacturing an electromagnetic component for an electric machine, the method comprising the steps of: A) providing one or more panels according to any one of claims 1 to 36 provided with an adhesive coating, B) transporting the sheet to an online facility comprising a punching tool, a device for emitting infrared radiation, and an extrusion punch, C) punching out a molded part designed as a stator lamination or a rotor lamination from the sheet metal provided in step A using the punching tool, D) irradiating the adhesive coating of the molded part formed in step C with infrared radiation by means of the device for emitting infrared radiation to activate the adhesive coating of the molded part, D) using the extrusion punch to extrude the molded part, E) Positioning the molded part in a positionally and / or angularly aligned manner in a positioning region, F) Repeating steps C) to E) until the desired number of molded parts is reached in the positioning area.

38. Method according to claim 37, characterized in that the production of the component is carried out in an in-line process, wherein the stamping tool and the extrusion punch are parts of the same press.

39. The method according to claim 37 or 38, characterized in that the means for emitting infrared radiation is arranged between the punching tool and the extrusion punch and comprises: at least one upper luminous means, which is directed in the stamping direction towards the first moulding surface, and / or At least one lower luminous means, which is directed opposite the punching direction towards the second molded part surface located opposite the punching tool.

40. Method according to claim 37 or 38, characterized in that after positioning the last of the desired number of molded parts, the component obtained is pressed by means of a pressing step downstream of step F with uniform surface pressure on the end face side.

41. The method according to claim 37 or 38, characterized in that Perform steps C to E using a stroke rate of at least 80 / min.

42. The method according to claim 37, wherein The electromagnetic component is a laminated core.

43. The method according to claim 41, wherein Perform steps C through E using a stroke rate between 120 / min and 300 / min.

44. A method for manufacturing an electromagnetic component for an electric machine, the method comprising the steps of: A) providing one or more panels according to any one of claims 1 to 36 provided with an adhesive coating, B) punching out a certain number of thin sheets from the sheet provided in step A using a punching tool, C) positioning the lamellae one above the other in a positionally and / or angularly aligned manner, D) embossing said sheets positioned one above the other, E) heating the sheets positioned overlapping each other at a predetermined temperature for a predetermined period of time.

45. The method according to claim 44, wherein after positioning the last of the desired number of said sheets, the component obtained is pressed in a direction perpendicular to the sheet surface by means of a pressing step downstream of step E, by means of a uniform surface pressure on the end face side.

46. ​​The method of claim 44, wherein the predetermined period of time is between 10 minutes and 60 minutes.

47. The method according to any one of claims 44 to 46, wherein the predetermined temperature is between 100°C and 200°C.

48. The method according to claim 44 or 45, characterized in that The electromagnetic component is a laminated core.

49. The method according to claim 48, characterized in that The laminated core is either a stator core or a rotor core.

50. The method according to claim 44 or 45, characterized in that A number of lamellae designed as stator lamellae or rotor lamellae are punched out from the sheet metal provided in step A using a punching tool.

51. The method of claim 44 or 45, wherein the predetermined period of time is between 10 and 40 minutes.

52. The method according to any one of claims 44 to 46, wherein the predetermined temperature is between 100°C and 150°C.

53. An electrical component for an electric machine, produced according to the method of any one of claims 37 to 52.

54. An electric machine comprising the electric component according to claim 53.

55. The electric machine according to claim 54, being designed as an electric motor for a passenger car, a truck or a motor two-wheeled vehicle.

56. The electric machine according to claim 54, being designed as an electric motor for an aircraft.

57. The electric machine according to claim 56, wherein The aircraft is a drone.

58. The electric machine of claim 54, being an electric motor.

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