Flat conductor device with twist area in the connection section, stator and method for manufacturing a flat conductor device.

Abstract

The invention relates to a flat conductor device (FV) for a stator (ST) of an electric machine of a traction drive, comprising a plurality of flat conductor elements (FE) that are at least partially parallel and are made of an electrically conductive material, wherein the flat conductor device (FV) has at least two longitudinal sections (LA) that run parallel to each other and a connecting section (VA) that connects the longitudinal sections (LA), wherein a twist area (TB) is formed in the connecting section (VA), and in the twist area (TB) the flat conductor elements (FE) exchange their conductor position.

Description

[0001] The invention relates to a flat conductor device comprising a plurality of flat conductor elements and having two essentially parallel longitudinal sections, wherein the longitudinal sections are connected to each other via a connecting section, and a twist area is formed in the connecting section, so that the flat conductor elements exchange their conductor position in the twist area.

[0002] Methods for manufacturing a winding for a stator are generally known. EP 3 884 570 B1, for example, discloses a method for manufacturing an endless wave winding. This method involves winding a plurality of electrical conductors side by side and spaced apart from each other around a winding blade. In this way, an endless wave winding, which can also be referred to as a winding mat, is produced. Furthermore, DE 10 2015 217 922 A1 discloses a method for manufacturing a stator in which straight conductor elements are arranged in the slots of the stator and twisted on one side.

[0003] There is a need to increase the performance of stators for electric traction drive machines and to reduce stators' costs. The stator winding can sometimes contribute to this.

[0004] A first object of the invention is to provide a flat conductor device that can have a reduced installation space requirement in a stator slot and can increase the performance of a stator.

[0005] A second object of the invention is to provide a stator with increased performance.

[0006] A third object of the invention is to provide a method for manufacturing a flat conductor device which can have reduced dimensions in a stator slot.

[0007] The first problem of the invention is solved by the subject matter of independent claim 1. The second problem is solved by the subject matter of dependent claim 7. The third problem is solved by the subject matter of dependent claim 10. Preferred embodiments or configurations of the invention are the subject matter of the dependent claims, the following description, and the drawings. Each described or shown feature, individually or in combination, can represent an aspect of the invention, unless explicitly stated otherwise in the description.

[0008] According to the first aspect, the invention relates to a flat conductor device for a stator of an electric machine of a traction drive, comprising a plurality of flat conductor elements that are at least partially parallel and are made of an electrically conductive material, wherein the flat conductor device has at least two longitudinal sections running parallel to each other and a connecting section connecting the longitudinal sections, wherein a twist area is formed in the connecting section, and in the twist area the flat conductor elements exchange their conductor position.

[0009] According to the first aspect of the invention, a flat conductor device for a stator of an electric machine of a traction drive is provided. The traction drive is preferably a component of a motor vehicle that is at least partially electrically powered. The traction drive is particularly preferably an axle drive.

[0010] The flat conductor device comprises a plurality of flat conductor elements that run parallel at least in sections. The flat conductor elements are electrically conductive. Preferably, the flat conductor elements comprise copper and / or aluminum or are made of copper and / or aluminum. It is therefore conceivable that the flat conductor elements are made of one material or a combination of materials. It is also conceivable that the flat conductor elements are made of a bimetal.

[0011] The number of flat conductor elements in a flat conductor device is at least two. However, it can also be three, four, five, six or more. Preferably, the number of flat conductor elements is not greater than ten, and particularly preferably not greater than eight.

[0012] Furthermore, the flat conductor device has two parallel longitudinal sections, the longitudinal sections being electrically connected to each other at their respective distal end sections via a connecting section. A twist section is formed within this connecting section, in which the flat conductor elements exchange their conductor positions. When current is applied to one of the stator windings of a stator formed from the flat conductor devices, the twist section can enable a preferred wiring configuration to provide a high-performance stator. This performance can preferably be related to the power density of the electrical machine or its operational efficiency.Because the twist section is formed in the connection segment, which—if the flat conductor device is arranged in a stator—projects beyond an end face of the stator and is therefore not located in the slots, any potential expansion of the twist section's outer cross-section has no effect on the stator's slot width. Consequently, the flat conductor device can be easily inserted into the slot. Therefore, there is no increased space requirement in the stator slot due to the twist section.

[0013] An advantageous embodiment of the invention lies in the fact that the flat conductor elements have electrical insulation. The electrical insulation can also be referred to as an insulating layer. The insulation is preferably formed on an outer cladding surface of the flat conductor elements. The insulation can preferably, but not exclusively, be shrink-wrapped, painted, coated, extruded, anodized, and / or sprayed onto the outer cladding surface. It is also conceivable that a wire blank is passed through an immersion bath to apply the insulating layer to the outer cladding surface of the flat conductor element. Particularly preferably, the electrical insulation can comprise a plastic and / or resin or be made entirely of plastic and / or resin.Likewise, a combination of the aforementioned methods and / or materials is possible to create the desired insulation properties of the flat conductor elements.

[0014] In an advantageous embodiment of the invention, the insulated flat conductor elements are arranged directly on top of one another. In other words, the flat conductor device comprises at least two flat conductor elements arranged parallel to, and preferably directly on top of, one another. "Directly" means that the insulated flat conductor elements are arranged directly on top of each other. Thus, no additional insulating layer, such as preferably insulating paper, is arranged between the flat conductor elements of a flat conductor device.

[0015] An advantageous embodiment of the invention lies in the fact that the longitudinal sections are designed without a twist zone. In other words, it is provided that the longitudinal sections of the flat conductor device—provided the flat conductor device is arranged in one or more slots of a stator—do not have a twist zone in which the flat conductor elements exchange their conductor positions. Thus, since the flat conductor device does not experience any expansion of its outer cross-section in the longitudinal section due to the absence of a twist zone, it can be easily arranged in the slots of a stator.

[0016] According to a preferred embodiment of the invention, the flat conductor device is a hairpin or a shaped winding. The shaped winding is preferably a continuous winding, which can also be referred to as a mat. It is characterized by the fact that it is preferably wavy or meandering in shape.

[0017] In an advantageous embodiment of the invention, it is provided that the following applies to a layer exchange of the flat conductor elements in the twist area: α=360° Number of flat conductor elements, where the number of flat conductor elements is: 2 ≤ number of flat conductor elements ≤ 10 and preferably 2 ≤ number of flat conductor elements ≤ 5.

[0018] Preferably, one longitudinal axis of the flat conductor elements has the same distance to one longitudinal axis of the flat conductor device.

[0019] The greater the number of flat conductor elements, the finer the twisting of these elements in the twist area. This can lead to improved AC resistance and / or reduced current displacement in the twist area. Furthermore, the finer twisting can reduce the impact on the insulation layer of the flat conductor elements in the twist area, which can have a beneficial effect on the creepage distance between two twist areas. With more than two flat conductor elements, advantageous aspect ratios of the individual conductors can also be achieved, thus reducing the degree of forming and the associated space requirement of the twist area. Additionally, a stator winding with flat conductor devices containing multiple flat conductors can lead to increased electrical symmetry, which is advantageous when energizing the stator winding and generating the magnetic field between the stator and a rotor.

[0020] It is conceivable that, in the case of a plurality of flat conductor elements, which are preferably all arranged one above the other and / or parallel to each other, the flat conductor elements are twisted or rotated by 180° relative to each other in the twist area of ​​the flat conductor device, causing the flat conductor elements to exchange their conductor position.

[0021] The cross-section of the provided flat conductor elements is preferably rectangular. The provided flat conductor elements therefore have two parallel first sides a and two parallel second sides b in cross-section. Preferably, the first side a is larger than the second side b. The flat conductor elements preferably have an aspect ratio (side a to side b) of 1.1:1 to 8:1.

[0022] The flat conductor elements are preferably arranged parallel to each other in such a way that the first side a of one flat conductor element faces the first side a of the adjacent flat conductor element.

[0023] In a second aspect, the invention relates to a stator for an electric machine of a traction drive, comprising a stator lamination stack with a plurality of spaced-apart slots, comprising a stator winding which has a flat conductor device according to one of the preceding claims, wherein the longitudinal sections of the flat conductor device are arranged in the slots and the connecting section having the twist area is formed outside the stator lamination stack.

[0024] According to the second aspect, a stator is provided, comprising a stator lamination stack, which is preferably cylindrical. The stator lamination stack has a plurality of slots arranged parallel to one another. In a cylindrical stator lamination stack, the slots are preferably arranged on an inner surface of the stator lamination stack. The slots preferably extend between a first end face and a second end face spaced axially from the first end face of the cylindrical stator lamination stack.

[0025] The flat conductor device is manufactured according to the inventive method and has at least one twist section in the connection segment. The flat conductor device can be designed as a hairpin or as a coil and is inserted or mounted in the slots of the stator lamination stack. The connection segment, and thus also the twist section, is located outside the slots of the stator. The conductor ends of the flat conductor device, if designed as a hairpin, are electrically connected to each other to form a stator winding. The electrically conductive connection can preferably, but is not limited to, be a welded connection.

[0026] Because the stator has the flat conductor device according to the invention with the conductor position change of the flat conductor elements, the stator can have an increased performance capability.

[0027] The stator winding is preferably arranged and / or formed in multiple layers within the slots of the stator. Accordingly, each slot has a specific depth. In a cylindrical stator, the slot depth extends radially outwards from an inner surface. The stator winding preferably has an even number of layers, such as 2, 4, 6, or 8. An odd number of layers, such as 3, 5, 7, or 9, is particularly preferred. Preferably, only the radially inner layer and / or the radially outer layer of the stator winding does not have a step in the radial direction of the slot. In a flat conductor device, its longitudinal sections thus run exclusively in the inner or outer layer. This allows for a stator winding that preferably has a stepped configuration, reducing the number of differently bent flat conductor elements.Consequently, the variety of parts can be reduced, which can have a positive impact on costs.

[0028] A preferred embodiment of the invention is characterized in that the stator winding is arranged in multiple layers within the slots, with each layer comprising a flat conductor assembly. Accordingly, the flat conductor assembly is arranged and / or configured in multiple layers within the slots. For this purpose, a plurality of flat conductor assemblies, preferably configured as hairpins, can be provided. The form winding is then preferably arranged in several layers within the slots.

[0029] Alternatively, an advantageous embodiment of the invention consists in the stator winding being formed in multiple layers within the slots, wherein the stator winding comprises the flat conductor assembly in at least one layer and twist-free conductor elements in a further layer. In other words, the stator winding is formed, on the one hand, by the flat conductor assembly, which has the twist region in the connection area of ​​the longitudinal conductors, and, on the other hand, by further conductor elements that do not have a twist region. Preferably, the cross-section of the further conductor elements corresponds substantially to a cross-section of the flat conductor assembly with the majority of the flat conductor elements. The further conductor elements are also conductive. The material of the flat conductor elements can be the same as or different from the material of the flat conductor elements. The further conductor elements can preferably be configured as I-pins or as hairpins.

[0030] In this context, it is further stipulated that the flat conductor device is preferably radially internal, i.e., in the first layer of the slot. Thus, in an internal rotor motor, it faces a rotor.

[0031] In a third aspect, the invention relates to a method for manufacturing the flat conductor device according to the invention, comprising the steps: - Providing a plurality of insulated flat conductor elements; - Arrange the flat conductor elements parallel to each other to form a flat conductor device; - Forming a twist area in the connection section of the flat conductor device, wherein the flat conductor elements exchange their conductor position in the twist area.

[0032] According to the third aspect of the invention, a method for manufacturing the flat conductor device according to the invention is provided. The flat conductor device is preferably designed for a stator of an electric machine of a traction drive and comprises a plurality of flat conductor elements.

[0033] The flat conductor elements are arranged parallel to each other to form a flat conductor device. In other words, the flat conductor device comprises at least two flat conductor elements arranged parallel to each other. The number of flat conductor elements in a flat conductor device is at least two. However, it can also be three, four, five, six, or more. Preferably, the number of flat conductor elements is not greater than ten, and particularly preferably not greater than eight.

[0034] In the flat conductor assembly, a twist section is formed in the connection area of ​​the longitudinal sections. This twist section is characterized by the fact that the flat conductor elements exchange their conductor positions within it. When the flat conductor assembly is or is arranged in a stator, the twist section, being formed in the connection area, lies outside the active length of the stator. The active length of a cylindrical stator preferably extends between two end faces spaced apart axially. When current is applied to one of the stator windings formed from the flat conductor assemblies, the twist section can enable a preferred wiring configuration to provide a high-performance stator. This performance can preferably be related to the power density of the electrical machine or its operational efficiency.Since the twist area is formed outside the stator, the flat conductor device can be arranged in the slot in a space-saving manner.

[0035] In an advantageous embodiment of the invention, the flat conductor elements are cut to length after the twist section has been formed. Consequently, the flat conductor elements are preferably unwound from one or more reels and thus provided, with the flat conductor elements being guided directly in parallel. The twist section is formed in the parallel flat conductor elements of the flat conductor device, whereby the flat conductor elements exchange their conductor positions due to the twist section. After the twist section has been formed in the flat conductor device, the flat conductor elements provided by the reels are cut to length.

[0036] As an alternative to the embodiment in which the flat conductor elements are cut to length after the twist section has been formed, a preferred embodiment of the invention is provided in which the flat conductor elements are cut to length and arranged parallel to each other before the twist section is formed. Accordingly, it is preferably provided that the flat conductor elements are unwound and cut to length from one or more rolls, thus supplying the flat conductor elements. Subsequently, the flat conductor elements of the flat conductor device are preferably arranged parallel to each other, and the twist section is formed. This can be advantageous depending on the design of the twist section.

[0037] A preferred embodiment of the invention provides that the twist section is formed by twisting and / or rotating the flat conductor assembly about its longitudinal axis. Accordingly, the flat conductor elements are arranged parallel to one another. This is independent of whether the flat conductor elements are cut to length before or after the twist section is formed. Preferably, the flat conductor elements of a flat conductor assembly are clamped in a torsion device. The torsion device preferably has two clamping elements spaced apart from each other in the longitudinal direction of the flat conductor assembly, with at least one clamping element being rotatable. It is conceivable that both clamping elements are rotatable in opposite directions.By twisting the clamping element(s), the twist zone can be formed to create the layer exchange of the flat conductor elements in the flat conductor device. The resulting twist zone of the flat conductor elements exhibits mirror symmetry based on the division of 360° by the number of flat conductor elements. The simultaneous forming of the parallel flat conductor elements results in a geometrically compact structure that offers space-saving advantages and enables an increased packing density or a higher fill factor in the slot, due to the mutual interaction of the flat conductor elements during the forming process.

[0038] An advantageous embodiment of the invention lies in the fact that the flat conductor elements are pre-embossed in the twist region according to the layer exchange before being arranged parallel to one another, and the formation of the twist region of the flat conductor device is achieved by joining the flat conductor elements so that the flat conductor elements are arranged parallel to one another. Consequently, it can be provided that the individual flat conductor elements of a flat conductor device are pre-embossed in the twist region such that the pre-embossing causes the flat conductor elements to undergo plastic deformation in the future twist region according to the intended layer exchange of the conductor layer. Subsequently, the flat conductor elements are joined.On the other hand, it can be provided that the individual flat conductor elements of a flat conductor device are pre-marked in the twist region such that the edge radii of the flat conductor elements have a reduced pitch circle than when the flat conductor device is rotated about its longitudinal axis without pre-marking. This can preferably have an advantageous effect on the mechanical stress on the insulation layer during the torsion process. The pre-marking of the edge radii can preferably be achieved by laterally deforming the flat conductor element FE, thereby rounding the edge radii. Preferably, the flat conductor elements pre-marked in this way and assembled into a flat conductor device are subsequently twisted and / or torsioned in the twist region to create the layer exchange of the conductor position in the flat conductor device.In this way, the stress distribution within the flat conductor elements caused by torsion can be more homogeneous, which allows for a more compact design of the flat conductor device and / or higher process reliability.

[0039] The joining of the flat conductor elements may preferably, but not limited to, include a parallel arrangement and / or a pivoting and / or an insertion of the flat conductor elements, so that the flat conductor elements of a flat conductor device run parallel to each other on the one hand and form the layer exchange in the twist area on the other.

[0040] An advantageous embodiment of the invention provides that, after the twisting section is formed, the flat conductor device is shaped into a hairpin or a coil. In other words, it is preferably possible to form the twisting section and subsequently wind the flat conductor device onto a spool as a continuous length, which can then be unwound and cut to length as needed. These flat conductor devices can then preferably be shaped into hairpins or coils. It is also conceivable that the flat conductor elements, which have already been cut to length and assembled into a flat conductor device before the twisting process, are shaped into a hairpin or coil using the twisting section.This allows for easier integration into the production plant, since the formation of the flat conductor device is at the beginning of the process chain for hairpin or coil production, and thus the design features of the final conductor geometry have less influence on the production or integration of the flat conductor device production into the production plant.

[0041] Alternatively, a preferred embodiment of the invention consists in the flat conductor device being formed into a hairpin before the twist section is formed. It is therefore conceivable that the flat conductor device is first formed according to the shape of a hairpin, and the twist section is subsequently formed.

[0042] It should be noted that all features described above and below with respect to one aspect of the present invention apply equally to every other aspect of the present invention. In particular, all features of the flat conductor device can apply equally to the stator and / or the method. The reverse is also true.

[0043] Further features and advantages of the present invention will become apparent from the dependent claims and the following exemplary embodiments. These exemplary embodiments are not intended to be limiting, but rather to be understood as illustrative. They are meant to enable a person skilled in the art to carry out the invention. The applicant reserves the right to make one or more of the features disclosed in the exemplary embodiments the subject of patent claims, or to include such features in existing patent claims. The exemplary embodiments are explained in more detail with reference to the drawings.

[0044] These show: Fig. 1 a flat conductor device designed as a hairpin, Fig. 2 a detailed view of a twist area in the flat conductor device, Fig. 3 a cross-section through a slot of a stator, Fig. 4 a method for manufacturing a flat conductor device in a first variant, Fig. 5 a method for manufacturing a flat conductor device in a second variant.

[0045] In Fig. Figure 1 shows a flat conductor device FV configured as a hairpin for a stator ST of an electric machine of a traction drive. The flat conductor device FV has a plurality of flat conductor elements FE that are at least partially parallel. In this specific example, there are two flat conductor elements FE. The flat conductor elements FE are electrically conductive. Preferably, the flat conductor elements FE comprise copper and / or aluminum or are made of copper and / or aluminum. It is therefore conceivable that the flat conductor elements FE are made of one material or a combination of materials. It is also conceivable that the flat conductor elements FE are made of a bimetal.

[0046] Furthermore, the flat conductor device FE has two parallel longitudinal sections LA, wherein the longitudinal sections LA are electrically connected to each other at their respective distal end sections via a connecting section VA. A twist section TB is formed in the connecting section VA, in which the flat conductor elements TB exchange their conductor positions. When current is applied to one of the stator windings of a stator ST formed from the flat conductor devices FV, ​​the twist section TB can enable a preferred connection configuration to provide a high-performance stator ST. The performance can preferably be related to the power density of the electrical machine or its efficiency in operation.Because the twist section TB is formed in the connection section VA, which—provided the flat conductor device FV is arranged in a stator ST—projects beyond an end face of the stator ST and is therefore not located in the slots NT, any potential expansion of the outer cross-section of the twist section TB has no influence on the slot width of the stator ST. Consequently, the flat conductor device FV can be easily inserted into the slot NT. Therefore, there is no increased space requirement in the slot NT of the stator ST due to the twist section TB.

[0047] In Fig. Figure 2 shows a detailed view of the twist area TB in the flat conductor assembly FV. Within the twist area TB, the flat conductor elements FE exchange their conductor positions. The torsion of the flat conductor assembly FV around its longitudinal axis can lead to an expansion of its outer cross-section, as shown. Since the twist area TB is formed in the connection section VA of the hairpin, this expansion of the outer cross-section of the flat conductor assembly FV does not affect its insertion into the slot NT of the stator ST. Therefore, the need for re-deformation of the expanded outer cross-section of the flat conductor assembly FV is eliminated in the twist area TB, which is located in the connection section VA. This allows for the optimization of process steps in the manufacture of the flat conductor assembly FV.Furthermore, the absence of re-deformation in the twist area TB eliminates additional mechanical stress on the insulation layer of the flat conductor elements FE, which can have a beneficial effect on the insulation layer.

[0048] In Fig. Figure 3 shows a cross-section through a slot NT of a stator ST. The stator ST comprises a stator lamination stack SB, which is cylindrical. The stator lamination stack SB has a plurality of parallel slots NT, although only one slot NT is shown in the illustration. In the cylindrical stator lamination stack SB, the slots NT are arranged on an inner surface IM of the stator lamination stack SB. The slots NT extend between a first end face and a second end face spaced axially from the first end face of the cylindrical stator lamination stack SB.

[0049] A stator winding SW is arranged in the slot NT of the stator ST. The stator winding SW is arranged and / or formed in four layers within the slot NT. Accordingly, the slot has a depth that extends radially outwards from the inner surface IM. Each layer of the stator winding ST is designed as a flat conductor device FV and, in the following example, comprises two flat conductor elements FE.

[0050] In Fig. Figure 4 shows a method for manufacturing a flat conductor device FV in a first variant.

[0051] In a first step 41, a plurality of flat conductor elements FE are provided. The flat conductor elements FE are electrically conductive. Preferably, the flat conductor elements FE comprise copper and / or aluminum or are made of copper and / or aluminum. The flat conductor elements FE preferably have insulation, which can also be referred to as an insulating layer. The insulation is electrical insulation, which is preferably formed on an outer cladding surface of the flat conductor elements FE.

[0052] Preferably, a plurality of coils with insulated flat wire are provided, and the plurality of the insulated flat conductor elements FE are supplied by these coils. The number of coils supplied is equal to the number of flat conductor elements FE of the flat conductor device FV. If the flat conductor device FV has two flat conductor elements FE, the number of coils for supplying the flat conductor elements FE is two. The plurality of coils allows the flat conductor elements FE to be guided in parallel simultaneously as they are unwound from the coil, thereby reducing the manufacturing time of the flat conductor device and thus having a beneficial effect on the manufacturing costs of the flat conductor device FV.

[0053] In a second step 42, the flat conductor elements FE are arranged parallel to each other to form a flat conductor device FV. In other words, the flat conductor device FV comprises at least two flat conductor elements FE that are arranged parallel to each other, and preferably directly adjacent to each other. Directly adjacent means that the insulated flat conductor elements FE are arranged directly parallel to each other and / or on top of each other. Thus, no additional insulating layer, such as preferably insulating paper, is placed between the flat conductor elements FE of a flat conductor device FV. The number of flat conductor elements FE in the present embodiment is two.

[0054] In the third step 43, the twist region TB is formed. The formation of the twist region TB occurs downstream of the second step 42. The twist region TB is formed by twisting and / or rotating the flat conductor assembly FV about its longitudinal axis. It is therefore provided that the flat conductor elements FE are arranged parallel to each other. Preferably, the flat conductor elements FE of a flat conductor assembly FV are clamped in a torsion device. The torsion device preferably has two clamping elements spaced apart from each other in the longitudinal direction of the flat conductor assembly FV, with at least one clamping element being rotatable. It is conceivable that both clamping elements are rotatable in opposite directions. By twisting the clamping element or elements, the twist region TB can be formed to create the layer exchange of the flat conductor elements FE of the flat conductor assembly FV.

[0055] In a fourth step 44, it is provided that after the formation of the twist area TB in the flat conductor device FV, the flat conductor device FV is cut to length. In other words, the flat conductor device FV, which has the twist area TB, is available as a length of material after the formation of the twist area TB and is cut to length according to the desired length of the flat conductor device FV.

[0056] In a fifth step 25, it is provided that the flat conductor device FV is formed into a hairpin after being cut to the desired length, so that the twist area TB is arranged in the connection section VA.

[0057] In Fig. Figure 5 shows a method for manufacturing a flat conductor device FV in a second variant.

[0058] In the first step 51, the flat conductor elements FE are provided, as was already done in the first step 41 of the Fig. 4 was described.

[0059] In the second step 53, the flat conductor elements FE are cut to length.

[0060] In a third step 53, the cut-to-length flat conductor elements FE are twisted around their longitudinal axis.

[0061] After twisting the flat conductor elements FE, in a fourth step 54 the flat conductor elements FE length is formed into a hair-pin, so that the twist area TB is arranged in the connection section VA of the respective flat conductor elements FE.

[0062] In a fifth step, the flat conductor elements FE formed into a hair-pin are formed into a flat conductor device FV by joining and arranging them parallel to each other, whereby the twist area TB of the flat conductor device FV is also formed by joining, in which the flat conductor elements FE exchange their conductor position. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 3 884 570 B1

[0002] DE 10 2015 217 922 A1

[0002]

Images