Electric motor and manufacturing process therefor

Abstract

Electric motor (9) comprising at least one base component (8) with a plurality of magnets (2), wherein the magnets (2) are each connected to the base component (8), wherein a connection (1) between respective contact surfaces (3) of the magnets (2) and the base component (8) is formed via a plurality of nanowires (4).

Description

[0001] The invention relates to an electric motor and a manufacturing method therefor.

[0002] A wide variety of electric motors are known for a wide variety of applications. Permanent-magnet electric motors are particularly well known. Permanent-magnet electric motors have one or more (permanent) magnets in common. Such permanent-magnet electric motors are discussed here. For some applications, an electric motor may require a long, thin (permanent) magnet applied to a surface. Long and thin mean that one dimension of the magnet perpendicular to the surface is significantly smaller than its dimension in any direction transverse to the surface (“thin”), and that the magnet has two dimensions transverse to the surface, one of which is significantly larger than the other (“long”). In known solutions, it is common for such a long, thin magnet to break. To avoid this, it has been proposed to divide the magnet into several sub-magnets.These partial magnets are glued individually to the surface. This requires a high degree of precision to ensure that the magnetic properties of the multiple partial magnets are the same as those of a non-separated magnet. It is common practice to glue the partial magnets on using adhesive. This often results in the partial magnets "floating". This means that the partial magnets remain movable until the adhesive hardens. This is particularly disadvantageous due to the mutual magnetic interactions between the partial magnets and can lead to inaccurate adhesion of the partial magnets. As an alternative to gluing the partial magnets, they can also be connected to the surface using methods such as soldering, welding, screwing, or frictional connection (i.e., pressure). All known connections have at least one of the disadvantages described below.

[0003] The process for forming the connection between the partial magnets and the surface can be complex (and require, for example, complex machinery). The process can also place significant demands on the components to be joined (e.g., with regard to minimum material thickness). Furthermore, such connections are often not long-term durable (i.e., they exhibit undesirable aging phenomena such as corrosion). A disadvantage common to many state-of-the-art connections between the partial magnets and the surface is their lack of thermal stability.

[0004] There are applications in which the maximum thermal load of an electric motor is not limited by the individual components, but by the connections formed within them. With regard to thermal load, another disadvantage of known connections is that some of them are formed at high temperatures. This is the case, for example, with welding or soldering. Even if both the connection and the connected components meet the thermal requirements of an application, a problem can arise. The connections required to manufacture an electric motor cannot be formed because the high temperature required would cause damage. For example, components to be joined can warp or deform thermally. Many known solutions also have the disadvantage that the connection is often uneven across a surface.

[0005] A flywheel is known from JP 5 966 ​​210 B1. This allows a large amount of kinetic energy to be stored and released at a later time. EP 2 128 963 A1 discloses a rotor for an electrical machine such as an electric motor. US 2011 / 0 204 020 A1 discloses a multilayer carbon nanotube capacitor. US 2016 / 0 276 879 A1 discloses a nanoparticle having an elongated core made of a magnetizable and / or magnetized material.

[0006] Based on this, the object of the present invention is to solve or at least mitigate the technical problems described in connection with the prior art. In particular, an electric motor is to be presented in which a plurality of magnets are connected to a base component. The connection can be formed simply, places low demands on the components to be connected, is long-term stable, has a particularly low thermal resistance, is thermally stable, and can be formed uniformly over a surface. Furthermore, a manufacturing method for such an electric motor is to be presented.

[0007] These objects are achieved with an electric motor according to the features of patent claim 1, with the use of a film according to the features of patent claim 5, and with a method for producing an electric motor according to the features of patent claim 9. Further advantageous embodiments are specified in the respective dependent claims. The features listed individually in the patent claims can be combined with one another in any technologically expedient manner and can be supplemented by explanatory facts from the description, whereby further embodiments of the invention are demonstrated.

[0008] According to the invention, an electric motor comprising at least one base component with a plurality of magnets is presented, in which the magnets are each connected to the base component. A connection between the respective contact surfaces of the magnets and the base component is formed via a plurality of nanowires.

[0009] An electric motor is understood here to be a permanently excited electric motor, i.e., a device having at least one (permanent) magnet, which is designed and configured to convert electrical energy into kinetic energy. The term "electric motor" is therefore to be interpreted broadly here and, in particular, is not to be restricted with regard to design features (no more than explicitly stated). For example, the electric motor can have one or more coils (optionally with a core, e.g., made of iron) as a rotor and one or more (permanent) magnets as stators.

[0010] The magnets are preferably permanent magnets. The magnets are preferably made of a ferromagnetic material, in particular iron, cobalt, nickel or an alloy containing these elements. It is particularly preferred that all magnets have the same shape and / or are made of the same material. In particular, it is preferred that the magnets are cuboid-shaped, that the magnets have an extension perpendicular to the surface of the base component that is (significantly) smaller than an extension in any direction transverse to this surface (i.e., that the magnets are “thin”), and that the magnets have two extensions transverse to the surface of the base component, one of which is (significantly) larger than the other (i.e., that the magnets are “long”). Each magnet preferably has a contact surface.In particular, it is preferred that the contact surface of each magnet makes up its entire side surface formed by its longest edges (i.e. the surface of the magnet that faces the surface of the base component when the magnet lies flat on the surface of the base component). In particular, it is preferred that the magnets have a macroscopic size. Macroscopic is understood here to mean that the magnets are sufficiently large that effects at the atomic level do not have to be taken into account. These can in particular be effects of quantum mechanics. In particular, macroscopic magnets are to be seen in contrast to microscopic structures, for which such effects at the atomic level would have to be taken into account. Microscopic structures can in particular be integrated circuits, e.g. on a semiconductor chip, or similarly dimensioned components or structures.

[0011] Preferably, the magnets have an extension of at least 0.1 mm [millimeters] in every direction. This means that, for example, a cuboid magnet has no edge with a length of less than 0.1 mm. Preferably, the magnets even have an extension of at least 0.2 mm [millimeters] in every direction, more preferably at least 0.5 mm, and most preferably at least 1 mm. In any case, in these cases, they are macroscopic magnets in the sense defined above.

[0012] The base component can be any component of the electric motor that has a surface configured and intended to receive the plurality of magnets. This means, in particular, that the base component preferably has at least one surface that is sufficiently large and sufficiently straight (in particular, completely flat). This surface preferably has a contact surface for each of the magnets.

[0013] A contact surface is preferably a spatially distinct region of the respective component (i.e., a magnet or the base component). For example, a contact surface can be formed as a (partial) surface of one of the magnets. Alternatively, it is preferred that the contact surfaces are distinguished by the formation of the connection. This means that the contact surface initially does not differ from the remaining surface and only emerges upon formation of the connection in such a way that the contact surface is the surface on which the connection is formed. In this case, the contact surface is notionally delimited (i.e., without spatial distinction) from the remaining part of the surface. This applies in particular to the contact surface on the surface of the base component. The surface of the base component is preferably uniformly formed, i.e.,that a contact surface of the base component is only identified by forming a respective connection with a magnet. It is preferred that exactly two contact surfaces are involved in the connection (i.e., a contact surface of a magnet and a contact surface of the base component).

[0014] Each contact surface involved in the connection preferably has a surface area of ​​at least 0.01 mm 2 [square millimeters], particularly preferably at least 0.25 mm 2 and most preferably at least 1 mm 2 As already described above, if the connection surface is chosen to be sufficiently large, no microscopic effects occur.

[0015] It is particularly preferred that the nanowires be provided over a portion of the surface of the base component (in particular, over the entire surface of the base component). Only a portion of the nanowires thus provided are used to form a connection with a magnet. This means that the nanowires are provided over an area, only parts of which are used as contact surfaces. The nanowires remain unused in the remaining portions of this area.

[0016] A nanowire is defined here as any material body with a wire-like shape and a size ranging from a few nanometers to a few micrometers. A nanowire can, for example, have a circular, oval, or polygonal base. In particular, a nanowire can have a hexagonal base. Preferably, all nanowires involved in the connection are made of the same material.

[0017] The nanowires preferably have a length in the range of 100 nm [nanometers] to 100 µm [micrometers], in particular in the range of 500 nm to 30 µm. Furthermore, the nanowires preferably have a diameter in the range of 10 nm to 10 µm, in particular in the range of 30 nm to 2 µm. The term "diameter" refers to a circular base area; if the base area deviates from this, a comparable definition of a diameter must be applied. It is particularly preferred that all nanowires used have the same length and the same diameter.

[0018] The connection is preferably formed by providing a plurality of nanowires between the respective contact surfaces to be connected. Due to the nanowires' size in the nanometer range, the surface area of ​​the connection (i.e., the area over which forces such as the van der Waals force act at the atomic level) is particularly large. Due to the large surface area of ​​the connection, the thermal conductivity of the connection can be particularly high. This can, for example, improve the cooling of the electric motor.

[0019] The described connection can also be formed particularly easily and without tools. All that is required is to bring the contact surfaces to be joined together. Pressure can be applied optionally, but is not absolutely necessary.

[0020] In particular, the connection can be formed instantaneously. This avoids the floating described above in prior art solutions. The individual magnets can be applied to the base component one after the other, whereby a magnet that has been applied once is instantly fixed in position and cannot be changed by a subsequently applied magnet. This allows a particularly precise arrangement of the magnets on the base component. The distances between the magnets can also be kept particularly small. There is no need to wait between the application of individual magnets, which can increase the efficiency of the manufacturing process. It is particularly preferred for the magnets to be positioned automatically using an alignment device (in particular a computer-controlled one), such as a gripper.

[0021] The only requirement for the components to be connected (i.e. the magnets and the base component) is that the large number of nanowires can be provided between the respective contact surfaces. This is, however, possible with a large number of contact surface materials. The connection described also shows no signs of aging. In particular, the connection described is particularly well protected against corrosion. The connection can also be particularly thermally stable. Thermally stable here means that the connection remains intact even when the temperature increases and, in particular, is not damaged. The reason for the thermal stability is that the connection achieves its stability through the large contact surface. This remains unchanged when the temperature changes. Furthermore, no thermal treatment (such as welding or soldering) is necessary to form the connection described here.This avoids the problems described above in this context. Furthermore, the described connection can be formed uniformly over a surface. In the absence of weld points, for example, the disadvantages of an uneven connection described above are thus avoided. The described connection also allows for a hermetic seal between the contact surfaces involved in the connection. This, too, is due to the large surface area of ​​the connection. In particular, this prevents air from being trapped between a magnet and the surface of the base component.

[0022] The described connection can be particularly mechanically stable, which can also be explained by the very large contact surface of the nanowires. Mechanically stable means in particular that no additional external measures are required. Such a measure would be understood here as, for example, if a magnet were additionally held with a clamp or a bracket. An adhesive connection (such as an adhesive bond) between a magnet and the base component should not be understood here as such an additional external measure (see also the description of the adhesive connection below). Such an adhesive connection is referred to here as an internal additional measure because it can be formed at the same location as the connection described here (or can equally be considered as part of the connection described here).The described connection is preferably designed such that it alone is sufficient to mechanically connect the respective magnet and the base component. This means that, in particular, no additional external measures described are necessary. However, an additional internal measure is possible and even preferred.

[0023] Furthermore, the described connection is particularly effective at damping vibrations and similar mechanical stresses. This is because the connection is not formed across the entire surface between the contact surfaces themselves, but indirectly via the flexible nanowires in between. This creates an intermediate layer between the rigid contact surfaces that can compensate for mechanical stresses particularly well. The connection is also particularly stable over the long term because it prevents the breakage of a rigid connection. In particular, the length of the nanowires and an (optional) pressing force (i.e., applied pressure) during connection formation can influence the extent of this resilient effect of the nanowires.

[0024] Preferably, the connection is designed to be non-detachable. This means that the connection cannot be broken under normal circumstances. The connection can only be destroyed if the components involved in the connection are damaged (i.e., under abnormal circumstances).

[0025] The non-detachable design of the connection can also lead in particular to the fact that the instantaneously formed connection can no longer be released, even for the purpose of adjusting the position of a magnet relative to the base component. It is therefore preferred that the magnets (as already mentioned above) are aligned automatically using an alignment device such as a gripper. This can in particular avoid the need to attempt to release the connection, for example by thermal and / or mechanical action, in order to correct an initially incorrect positioning of a magnet. Thermal action is particularly disadvantageous, as described above. Mechanical action can also be disadvantageous, particularly in the form of vibration (such as ultrasound).Preferably, the connection is formed without any thermal and / or mechanical influence, in particular without any ultrasonic or other vibration influence.

[0026] The use of a reducing medium, which removes any oxide layer present on the nanowires and also further supports adhesion, can be performed depending on the strength requirements of the bond. Adhesive bonding can also be described as fusing the nanowires into a closed structure. However, the term fusing is used merely as an analogy. The nanowires are bonded as if they were fusing together. Actual melting of the nanowires (and in particular, heating them above their melting temperature) is preferably avoided. Mechanical action can also be used additionally to achieve the desired strength.

[0027] The nanowires can be formed in any orientation between the contact surfaces involved in the connection. For example, the nanowires can have a different orientation at each of the contact surfaces involved in the connection, so that the nanowires interlock at an angle to one another, for example. It is also possible for a contact surface to be divided into a plurality of sub-areas, with the nanowires being oriented differently in the various sub-areas. This allows for a particularly stable connection to be realized, which can particularly withstand shear forces. Furthermore, it is possible for the nanowires to be designed differently at the various contact surfaces involved in the connection, in particular with regard to their length, diameter, material, and density (where the density of the nanowires indicates how many nanowires are provided per surface). For example,Small nanowires on one contact surface can thus engage with a structure of large nanowires on the other contact surface.

[0028] In a preferred embodiment of the electric motor, the nanowires are oriented perpendicular to at least one of the contact surfaces involved in the connection.

[0029] Preferably, the connection involves two contact surfaces oriented parallel to each other. In this case, the nanowires are preferably oriented perpendicular to both contact surfaces. Due to the perpendicular orientation to at least one of the contact surfaces, the connection can be formed over a particularly large surface area (of the nanowires). This allows the connection to be formed particularly stable. The advantages described above can be achieved particularly well in this embodiment.

[0030] In a further preferred embodiment of the electric motor, an adhesive connection is additionally formed between the contact surfaces involved in the connection.

[0031] The adhesive bond can be formed, for example, with an adhesive or a polymer material. The additional adhesive bond can significantly enhance the mechanical stability of the connection. Preferably, the adhesive bond is formed as an adhesive layer.

[0032] In a further preferred embodiment of the electric motor, each contact surface involved in the connection has a plurality of nanowires.

[0033] In this embodiment, the connection is formed by providing a plurality of nanowires on each of the contact surfaces involved, and by bringing the nanowires into contact by bringing the contact surfaces closer together. This means that the connection is formed between the nanowires of the respective contact surfaces. This allows a particularly large contact surface of the connection (i.e., the nanowires forming it) to be achieved.

[0034] A further aspect of the invention relates to a use of a foil for forming a connection between a magnet and a base component of an electric motor, wherein the connection between respective contact surfaces of the magnet and the base component is formed via a plurality of nanowires, wherein a plurality of nanowires are enclosed within the foil, and wherein the foil is enclosed between respective contact surfaces of the magnet and the base component.

[0035] The nanowires are preferably formed by growing them in a structured film. Galvanic processes, for example, can be used for this purpose. By dissolving the film (e.g. chemically or thermally), the grown nanowires can be removed from the film. However, if the nanowires are left in the film, this film can be used as described here to form the connection between the magnets and the base component. Using the film in this way can simplify the process for forming the connection. In particular, the location where the nanowires are produced and the location where the connection is formed can be separated from one another. Once produced, the film can be used like known adhesive strips. The film can also be provided rolled up on a roll.The film allows the connection described here to be formed by simply adhering the film to the respective contact surfaces. Preferably, the film is applied to each contact surface involved in the connection. Alternatively, it is preferred that the film be applied to only one contact surface involved in the connection.

[0036] The special advantages and design features of the electric motor described above are applicable and transferable to the described use of a film, and vice versa.

[0037] In a preferred embodiment of the use of a film, the electric motor is designed as described above.

[0038] In a further preferred embodiment of the use of a film, the film is at least partially dissolved by heating.

[0039] Once the film is positioned between the contact surfaces involved in the connection, and once the connection has been formed (possibly under pressure), the film is no longer needed and can be removed. The film is preferably dissolved chemically (e.g., by an acid or other solvent, particularly an organic solvent) or thermally (i.e., by external heating).

[0040] In a further preferred embodiment of the use of a film, the film is formed from such a material that by heating the film between the contact surfaces involved in the connection, an adhesive connection is additionally formed.

[0041] In this embodiment, the adhesive bond described above is obtained from the film material. This can simplify the process for forming the bond because an additional application of, for example, an adhesive layer can be omitted.

[0042] A further aspect of the invention relates to a method for producing an electric motor comprising at least one base component with a plurality of magnets, wherein the magnets are each connected to the base component, wherein a connection between respective contact surfaces of the magnets and the base component is formed via a plurality of nanowires, and wherein the method comprises at least the following method steps: a) Providing the magnets and the base component, b) providing a plurality of nanowires on at least one of the contact surfaces of the magnets and / or the base component involved in the respective connection, and c) mechanically connecting at least two respective contact surfaces involved in the respective connection by means of the plurality of nanowires.

[0043] The specified procedural steps are preferably, but not necessarily, carried out in the specified order.

[0044] The special advantages and design features of the electric motor and the use of a foil described above are applicable and transferable to the described method, and vice versa.

[0045] In a preferred embodiment of the method, the electric motor is designed as described above.

[0046] In a further preferred embodiment of the method, step b) is realized for at least one of the contact surfaces by growing the nanowires on the respective contact surface.

[0047] The growth of the nanowires is preferably achieved through a galvanic process. For this purpose, the corresponding component (i.e., one of the magnets or the base component) is introduced at least partially, i.e., in particular, at least with its contact surface to be covered, into a device for growing nanowires. The device can, for example, be a vacuum chamber in which nanowires can be grown through a galvanic process.

[0048] In a further preferred embodiment of the method, in step b) a protection is applied to at least one of the contact surfaces, wherein in step c) the protection is at least partially removed before the contact surfaces are connected.

[0049] The protection is preferably a layer of a material that does not form a chemical bond with the nanowires, that provides mechanical protection for the nanowires, and that can be removed again without damaging the nanowires (e.g., chemically or thermally). In particular, the protection can be a varnish (such as PMMA or a sawing varnish commonly used in nanotechnology). The protection can be particularly advantageous during transport of the components between the provision of the nanowires and the formation of the connection. The protection can also be referred to as transport protection.

[0050] In a further preferred embodiment of the method, step b) is realized for at least one of the contact surfaces by applying a film to the respective contact surface, wherein the plurality of nanowires is enclosed within the film, and wherein the film represents the protection.

[0051] In particular for this embodiment of the method, the particular advantages and design features of the use of a film described above are applicable and transferable.

[0052] In a further preferred embodiment of the method, the protection is at least partially formed with a material such that in step c) an adhesive connection is additionally formed between the contact surfaces involved in the connection.

[0053] In this embodiment, the protection has the additional function of forming the adhesive bond described above. This simplifies the process; in particular, it eliminates the need for an additional process step, such as applying an adhesive material to form the adhesive bond.

[0054] In a further preferred embodiment of the method, the adhesive bond is formed by heating the protection.

[0055] By heating the protection, it can be at least partially removed and at least partially converted into the adhesive bond.

[0056] In a further preferred embodiment of the method, in step c) an oxide layer on the nanowires is at least partially removed from at least one of the contact surfaces before the contact surfaces are connected.

[0057] A (natural) oxide layer can form on the nanowires. This can impair the mechanical and / or thermal properties of the connection. By removing this oxide layer, the quality of the connection can be improved with regard to the aforementioned aspects. The pressure required to form the connection can also be reduced by removing the oxide layer. The oxide layer is preferably removed by applying a flux (such as an acid, in particular a reducing acid such as hydrochloric acid (HCl) or formic acid (CH2O2)) or by using a plasma (e.g., an argon plasma). The acid used preferably contains no oxygen atoms (which could be released by chemical reactions, which could contribute to the renewed formation of the oxide layer). Particularly preferably, the flux also contributes to the formation of the adhesive bond. This can be the case, for example, with acrylates.

[0058] In a further preferred embodiment of the method, the oxide (in particular the oxide layer on the nanowires) is removed by a reducing gas (e.g. by a forming gas or a formic acid vapor).

[0059] In a further preferred embodiment of the method, step b) is carried out for each contact surface involved in the connection.

[0060] In this embodiment, the connection is formed between the nanowires. This allows for a particularly large contact surface of the connection (i.e., the nanowires forming it).

[0061] The invention and the technical environment are explained in more detail below with reference to the figures. The figures show particularly preferred embodiments, to which the invention is not limited, however. It should be noted in particular that the figures, and in particular the proportions shown, are only schematic. They schematically show: Fig. 1: a first embodiment of a connection of a magnet to a base component, Fig. 2: a second embodiment of a connection of a magnet to a base component, Fig. 3: a third embodiment of a connection of a magnet to a base component, Fig. 4: a basic component suitable for forming a connection, and Fig. 5: an electric motor comprising a base component with a plurality of magnets.

[0062] Fig. 1 shows a connection 1 of a magnet 2 to a base component 8, wherein the connection 1 is formed between contact surfaces 3 of the magnet 2 and the base component 8 via a plurality of nanowires 4. In this embodiment, the nanowires 4 are connected to both contact surfaces 3 involved in the connection 1. The connection 1 according to this embodiment can be realized, for example, by providing the base component 8, wherein a plurality of nanowires 4 are provided on its contact surface 3, and by connecting the base component 8 to the magnet 2, whose contact surface 3 has no nanowires.

[0063] Fig. 2 shows a connection 1 of a magnet 2 and a base component 8, in which, in contrast to the embodiment in Fig. 1 both contact surfaces 3 involved in the connection 1 each have a plurality of nanowires 4.

[0064] The Fig. The embodiment shown in Figure 3 is similar to Fig. 2. Here, only an additional adhesive connection 5 is formed between the contact surfaces 3 involved in connection 1.

[0065] Fig. Figure 4 shows a base component 8 having a plurality of nanowires 4 on a contact surface 3. The nanowires 4 are enclosed in a foil 6, which represents a protection 7. The base component 8 according to this embodiment is designed to form a connection, as shown, for example, in Fig. 3 is shown, suitable and intended.

[0066] Fig. Figure 5 shows an electric motor 9 comprising a base component 8 with a plurality of magnets 2 (here, for example, six magnets 2). The magnets 2 are each connected to the base component 8, with a connection 1 between respective contact surfaces 3 of the magnets 2 and the base component 8 being formed via a plurality of nanowires 4. List of reference symbols 1 connection 2 magnets 3 Contact surface 4 nanowires 5 adhesive bond 6 Slide 7 Protection 8 Basic component 9 Electric motor

Claims

[1] Electric motor (9) comprising at least one base component (8) with a plurality of magnets (2), wherein the magnets (2) are each connected to the base component (8), wherein a connection (1) between respective contact surfaces (3) of the magnets (2) and the base component (8) is formed via a plurality of nanowires (4). [2] Electric motor (9) according to claim 1, wherein the nanowires (4) are oriented perpendicular to at least one of the contact surfaces (3) involved in the connection (1). [3] Electric motor (9) according to one of the preceding claims, wherein an adhesive connection (5) is additionally formed between the contact surfaces (3) involved in the connection (1). [4] Electric motor (9) according to one of the preceding claims, wherein each contact surface (3) involved in the connection (1) has a plurality of nanowires (4). [5] Use of a film (6) for forming a connection (1) of a magnet (2) to a base component (8) of an electric motor (9), wherein the connection (1) is formed between respective contact surfaces (3) of the magnet (2) and the base component (8) via a plurality of nanowires (4), wherein a plurality of nanowires (4) are enclosed within the film (6), and wherein the film (6) is enclosed between respective contact surfaces (3) of the magnet (2) and the base component (8). [6] Use of a film (6) according to claim 5, wherein the electric motor (9) is designed according to one of claims 1 to 4. [7] Use of a film (6) according to one of claims 5 or 6, wherein the film (6) is at least partially dissolved by heating. [8] Use of a film (6) according to one of claims 5 to 7, wherein the film (6) is formed from such a material that by heating the film (6) between the contact surfaces (3) involved in the connection (1) an adhesive connection (5) is additionally formed. [9] Method for producing an electric motor (9) comprising at least one base component (8) with a plurality of magnets (2), wherein the magnets (2) are each connected to the base component (8), wherein a connection (1) between respective contact surfaces (3) of the magnets (2) and the base component (8) is formed via a plurality of nanowires (4), and wherein the method comprises at least the following method steps: a) Providing the magnets (2) and the base component (8), b) providing a plurality of nanowires (4) on at least one of the contact surfaces (3) of the magnets (2) and / or the base component (8) involved in the respective connection (1), and c) mechanically connecting at least two respective contact surfaces (3) involved in the respective connection (1) by means of the plurality of nanowires (4). [10] Method according to claim 9, wherein the electric motor (9) is designed according to one of claims 1 to 4. [11] Method according to one of claims 9 or 10, wherein step b) is realized for at least one of the contact surfaces (3) by growing the nanowires (4) on the respective contact surface (3). [12] Method according to one of claims 9 to 11, wherein in step b) a protection (7) is applied to at least one of the contact surfaces (3), and wherein in step c) the protection (7) is at least partially removed before the contact surfaces (3) are connected. [13] Method according to claim 12, wherein step b) is realized for at least one of the contact surfaces (3) by applying a film (6) to the respective contact surface (3), wherein the plurality of nanowires (4) is enclosed within the film (6), and wherein the film (6) represents the protection (7). [14] Method according to one of claims 12 or 13, wherein the protection (7) is at least partially formed with a material such that in step c) an adhesive connection (5) is additionally formed between the contact surfaces (3) involved in the connection (1). [15] Method according to claim 14, wherein the adhesive connection (5) is formed by heating the protection (7). [16] Method according to one of claims 9 to 15, wherein in step c) before connecting the contact surfaces (3) an oxide layer on the nanowires (4) is at least partially removed in at least one of the contact surfaces (3). [17] Method according to one of claims 9 to 16, wherein step b) is carried out for each contact surface (3) involved in the connection (1).

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