Inductive coil, method for manufacturing an inductive coil, inductive coil system, vehicle

Abstract

An inductive coil (1) is specified, comprising - a carrier (2) and - a first coil (3) arranged on the support (2), wherein - the first coil (3) comprises a multitude of conductor bundles, - each of the numerous conductor bundles comprises a multitude of individual conductors and - all or part of the windings of the first coil (3) have a polygonal, in particular square or rectangular, cross-sectional area perpendicular to the direction of current. Furthermore, a method for manufacturing an inductive coil (1), an inductive coil system and a vehicle (13) are specified.

Description

[0001] An inductive coil is specified. Furthermore, a method for producing an inductive coil, an inductive coil system, and a vehicle are specified.

[0002] Coil systems used for power transmission typically comprise coils with round cable cross-sections. The cable cross-sections of typical coils depend, for example, on the power to be transmitted. The power to be transmitted, for example, in electric vehicles, is currently in the single- to double-digit kW range. With the resulting typical cable cross-section diameter, the typical coil cannot be wound as tightly as required due to minimum bending radii.

[0003] The minimum bending radius, in conjunction with the cable cross-section, is one of the main factors influencing space requirements. Achieving the required number of coil turns requires a correspondingly complex system design. The winding and manufacturing process is correspondingly complex.

[0004] One task to be solved is to specify an inductive coil with a particularly efficient unidirectional or bidirectional energy transfer. Furthermore, an inductive coil system and a vehicle are to be specified.

[0005] These problems are solved by the system and the subject matter of the independent patent claims. Advantageous embodiments, implementations, and further developments are the subject matter of the respective dependent patent claims.

[0006] First, the inductive coil will be explained. The inductive coil is, for example, part of a mobile unit of an electric vehicle and / or part of a stationary unit. The mobile unit and the stationary unit are designed to transmit energy, in particular wirelessly.

[0007] The electric vehicle is, for example, a passenger car, a truck, a van, a motorcycle, a rail vehicle and / or an industrial truck. In particular, the electric vehicle is a battery electric vehicle (BEV for short) and / or a plug-in hybrid battery electric vehicle (PHEV for short), each of which has an electric motor powered by an energy storage device. The energy storage device is, for example, a traction battery and comprises, for example, a plurality of energy storage cells that are connected to one another. The cells are, for example, a lithium-ion cell, a solid-state cell, or a sodium-ion cell.

[0008] In particular, the energy storage device can be charged and / or discharged using the inductive coil.

[0009] According to at least one embodiment, the inductive coil comprises a carrier. The carrier extends, for example, along a main extension plane in lateral directions. A vertical direction is oriented perpendicular to the lateral directions.

[0010] According to at least one embodiment, the inductive coil comprises a first coil arranged on the carrier. The first coil is, for example, in direct contact with the carrier. A surface of the carrier that is in direct contact with the first coil is, in particular, electrically insulating. Additionally or alternatively, an intermediate layer, in particular an electrically insulating intermediate layer, can be introduced between the coil and the carrier. The carrier is, for example, designed as a mechanical support for the first coil. The carrier can be a stand-alone component or integrated into other system components, e.g., housing components.

[0011] According to at least one embodiment of the inductive coil, the first coil comprises a plurality of conductor bundles, each of the plurality of conductor bundles comprises a plurality of individual lines, and all or some of the turns of the first coil have a polygonal, in particular quadrangular, in particular rectangular, cross-sectional area perpendicular to a main current direction.

[0012] According to at least one embodiment of the inductive coil, the first coil comprises an electrically conductive element comprising many very fine individual conductors with a polygonal, preferably rectangular, cross-sectional area, which, as a current path, determines the path of the electric current through the coil. The polygonal, preferably rectangular, cross-sectional area runs perpendicular to a main direction of extension of the current-carrying element.

[0013] According to at least one embodiment of the inductive coil, the plurality of individual lines are stranded, in particular twisted, together to form sub-bundles and the sub-bundles are stranded, in particular twisted, together to form bundles, and the plurality of bundles are twisted, braided, crossed, interwoven or connected to one another by similar methods.

[0014] According to at least one embodiment of the inductive coil, the majority of the individual lines or all of the individual lines are regularly led outwards into the area of ​​the lateral surface of the winding.

[0015] To achieve a sufficient current-carrying cross-section, for example, many individual cables are gradually combined into sub-bundles, which are then increasingly bundled together to ultimately produce a polygonal, preferably rectangular cross-section of the current path. The bundling in the respective steps can be achieved, for example, by stranding processes (e.g. twisting, spinning, braiding, stranding or similar processes), by surface-forming processes such as braiding, weaving, entangling, crossing, knitting or similar processes, or by combinations of the processes. The individual cables are preferably routed in the current path in such a way that none of the individual cables remains permanently in the inner area of ​​the cross-section of the current path, but is regularly routed outwards into the area of ​​the sheath surface. Concentric structures with central elements should be avoided.

[0016] The individual lines are preferably insulated from one another. The insulation of the individual lines is formed, for example, with an electrically insulating varnish, in particular a continuous varnish layer. At least some or all of the sub-bundles, bundles and / or the turns of the resulting current path are insulated from one another, for example with a sheath or intermediate layer that is electrically insulating. The insulation can extend over the entire length or be present only in partial areas. End areas, in particular, can be excluded from the insulation. Alternatively, at least some or all of the sub-bundles, bundles and / or the turns of the resulting current path can be free of further insulation.

[0017] The following is an example of a possible structure for a current path. The number of individual wires, bundles, and sub-bundles, as well as the structure and sequence of twisting and flat-forming processes, can vary. For example, individual wires are insulated with a layer of varnish, twisted into sub-bundles, and the sub-bundles are then twisted together again until a bundle with the desired strand thickness is achieved. Several of these bundles are then processed, for example by braiding, into a flat structure, which is then given a rectangular cross-sectional shape. This is achieved, for example, by processing the bundles into a tubular braid, which is then compressed. When individual wires are used as individual wires, typical wire diameters are in the range of 0.020 to 0.200 mm.The total number of individual wires varies, for example, with the operating frequency as well as the power and efficiency requirements of the application and is typically in the four-digit range, but can also vary depending on the application. The number of individual wires per sub-bundle and bundle, as well as the number of bundles, can vary depending on the application and available manufacturing processes. For example, 24 braided bundles, with each bundle consisting of, for example, 5 sub-bundles, and each sub-bundle consisting of, for example, 21 individual wires with a diameter of, for example, 0.070 mm, result in a total cross-section of approximately 10 mm. 2 and 2520 individual wires.

[0018] According to at least one embodiment of the inductive coil, the current path of the first coil comprises a polygonal, in particular quadrangular, cross-sectional area, wherein the corners may be rounded. The polygonal cross-sectional area extends perpendicular to the main extension direction of the current path of the first coil. The polygonal cross-sectional area is delimited, for example, by an outer shape. The outer shape comprises, in particular, four edges, wherein directly adjacent edges are each connected to a corner. Thus, the polygonal cross-sectional area is, in particular, a quadrangular cross-sectional area.

[0019] For example, the quadrangular cross-sectional area is a rectangular cross-sectional area with the corners at an angle of 90 degrees. The corners can be rounded. In particular, opposite edges are of equal length. In particular, the cross-sectional area has a height in the vertical direction. In particular, the cross-sectional area has a width in the lateral direction. For example, the quadrangular cross-sectional area has a main extension direction that extends either along the height or along the width. The ratio of the extension of the quadrangular cross-sectional area along the main extension direction to the maximum extension of the quadrangular cross-sectional area perpendicular to the main extension direction is typically in the range 1:1 to 1:50, but can also deviate from this depending on the application.

[0020] In at least one embodiment, the main extension direction of the polygonal, in particular rectangular, cross-section of the current-carrying element is oriented vertically. In plan view, this reduces the conductor area penetrated by the field and increases the effective coil area, thereby improving transmission.

[0021] For example, the first coil is surrounded by a common insulation which is designed to be electrically insulating. The common insulation surrounds the first coil, in particular on an outer surface, wherein end regions of the first coil can be free of the common insulation. In particular, the common insulation completely surrounds all lines, wherein the end regions can be free of the common insulation. The common insulation is formed, for example, with an electrically insulating polymer layer, for example a coherent polymer sheath, by potting or by wrapping. Alternatively, the first coil can be free of the common insulation. Alternatively or in part, the common insulation can also be formed by surrounding components, for example housings or insert components.

[0022] Instead of a typical round cable cross-section, the first coil advantageously has a square cable cross-section, e.g., a square and, in particular, a rectangular cable cross-section, wherein the cable cross-section is characteristic of the cross-sectional area of ​​the first coil. In contrast to typical solid conductors with a rectangular cross-section, e.g., in a busbar, the first coil is constructed from a plurality of very fine and thin wires, especially single wires.

[0023] Such a cross-sectional area of ​​the first coil advantageously increases the compactness of the inductive coil compared to typical coils with a typical round cable cross-section. This increased compactness can be advantageously used to optimize the coil geometry in the radial direction or a height dimension.

[0024] Such a cross-sectional area of ​​the first coil advantageously has a comparatively high degree of space filling and thus a comparatively high degree of compactness. Furthermore, turns of the first coil can advantageously have smaller bending radii, especially compared to typical coils. This allows the first coil to be advantageously wound comparatively tightly. This advantageously allows effective coil areas to be increased while maintaining the same external dimensions, or external dimensions to be reduced while maintaining the same effective coil areas. Alternatively or additionally, the cross-sectional area of ​​the first coil can advantageously be selected to be particularly large to reduce losses.

[0025] According to at least one embodiment of the inductive coil, the plurality of individual wires are twisted together, and the plurality of wire bundles are twisted, braided, or otherwise crossed with each other. Each bundle is, for example, characteristic of a transposed wire comprising the plurality of individual wires. Furthermore, the first coil is characteristic of a transposed wire comprising the plurality of individual wires. In particular, the first coil is characteristic of a braid or mesh of individual wires formed into the polygonal cross-sectional area.

[0026] By twisting, braiding, or otherwise crossing, none of the individual conductors is permanently located within the polygonal cross-sectional area. Rather, all or almost all of the individual conductors are routed at predefined intervals to the outer surface of the first coil, or at least close to the outer surface of the first coil. This advantageously ensures that all, or at least a majority of, the conductors participate to a similar extent in the transmission process and power transmission.

[0027] According to at least one embodiment of the inductive coil, the first coil comprises two end regions, for example an outer end region and an inner end region.

[0028] According to at least one embodiment of the inductive coil, the first coil is wound around a winding axis from one end region to the other, and the winding axis runs perpendicular to a main extension plane of the carrier. The winding axis is arranged in particular at a center of the first coil. The first coil comprises, for example, n windings around the winding axis, where n is a natural number equal to or greater than 2.

[0029] The winding axis is, for example, a virtual winding axis or the axis of a body on which the coil is wound during the manufacturing process. This winding body can either remain in the coil or be removed before assembly. The winding body can be a separate component or integrated into other system components, such as the housing, support structure, or coil carrier.

[0030] To achieve the required number of turns, conventional coils with a round cable cross-section are often wound in multiple layers. Multi-layer winding is characterized by the fact that the centers of the turns are concentrated in at least two different positions along the winding axis. In one embodiment, in particular, the first coil has a structure with concentric windings, in which the centers of the turns are located approximately at the same position along the winding axis, thus avoiding multi-layer structures. This is particularly advantageous because, with single-layer structures, it is ensured that no turns are located in the vertical flux shadow of turns located below or above.

[0031] According to at least one embodiment of the inductive coil, the first coil has a polygonal shape in plan view, wherein the corners may be rounded. In particular, an outer shape and an inner shape of the first coil are polygonal in plan view. "In plan view" is particularly characteristic of a vertical view of the first coil.

[0032] According to at least one embodiment of the inductive coil, the end regions comprise an outer end region and an inner end region or two inner or two outer end regions.

[0033] According to at least one embodiment of the inductive coil, the first coil has connection regions and / or one or more end regions with one or more connection regions, perpendicular to the main extension plane of the carrier. The outer connection region and / or the inner connection region is / are designed, for example, to be electrically conductively contactable from the outside. The outer end region comprises, for example, the outer connection region, which is bent by approximately 90°, so that the outer connection region extends along the vertical direction. The inner end region comprises, for example, the inner connection region, which is bent by approximately 90°, so that the inner connection region extends along the vertical direction. In contrast to typical round cable cross-sections, the current path of the first coil used here can advantageously be bent for contacting.

[0034] Alternatively, for example, a fitting, an elbow or a plug can be arranged on the inner connection area and / or the outer connection area.

[0035] Alternatively or additionally, the inner connection area and / or the outer connection area can be contacted by pressing, soldering, welding, screwing, or other common connection techniques. Furthermore, the inner connection area and / or the outer connection area, with the particularly square cross-sectional area, is / are each arranged on a busbar of a further circuit, e.g., a compensation circuit. This advantageously provides simple and geometrically compact connection areas, e.g., for assembly steps, and connection options.

[0036] Alternative embodiments can be derived from the embodiments described here, for example, by moving both connection areas inwards or both connection areas outwards.

[0037] According to at least one embodiment of the inductive coil, the first coil comprises a current-carrying element, the cross-sectional area of ​​the current-carrying element has a main extension direction, the cross-sectional area is oriented such that its main extension direction is oriented vertically, and / or the cross-sectional area is oriented such that its main extension direction is oriented in the direction of the surface normal of the coil surface.

[0038] According to at least one embodiment of the inductive coil, the first coil comprises a plurality of segments, wherein each segment extends substantially along a straight or slightly curved line, directly adjacent segments are connected by short sections with a small bending radius, two directly opposite segments run almost parallel and / or the first coil has a polygonal shape in plan view.

[0039] For example, directly adjacent segments run essentially perpendicular to each other. "Essentially" here and below means that the segments may deviate from a straight line due to the inherent bending of the cables and that the segments may enclose an angle of 90° plus or minus a maximum of 5°, in particular a maximum of 1°, due to manufacturing tolerances.

[0040] Directly adjacent segments are connected to each other with a 90° bend. The bend radius, for example, is at least in the range of the cable thickness. Larger bend radii are typically easier to implement.

[0041] Preferably, the segments are arranged side by side in lateral directions. Adjacent segments that run parallel to each other are, in particular, spaced apart from each other, with the minimum distance being determined by the thickness of the required insulation layer and, with suitable insulation materials, can also be chosen to be very small. Thus, the first coil is wound in lateral directions around the winding axis, with the segments not overlapping in plan view.

[0042] Alternatively, the segments are arranged stacked vertically, for example. Thus, the first coil is wound around the winding axis in lateral directions, with at least some of the segments overlapping in plan view. In particular, the windings overlap in plan view.

[0043] According to at least one embodiment of the inductive coil, the carrier has a structure, wherein the structure has a plurality of elevations, each of which is arranged between two directly opposite, parallel segments. For example, the carrier comprises a main surface that extends in lateral directions. The elevations are arranged on the main surface of the carrier. Two directly opposite elevations define, for example, a recess, wherein, in particular, one segment is arranged in each recess. In particular, the number of elevations is determined by the number of turns of the first coil.

[0044] The raised portions can advantageously keep the individual windings at a distance, thus facilitating assembly, for example. The raised portions can advantageously be characteristic for securing the first coil. Furthermore, the raised portions can be characteristic for insulating directly opposite, parallel segments.

[0045] According to at least one embodiment of the inductive coil, an insulating layer is arranged between the elevations and the directly adjacent segments. In particular, the side surfaces and bottom surfaces of the recesses can be covered with an insulating layer. The side surfaces are defined in particular by the elevations, and the bottom surfaces are defined by the main surface of the carrier exposed between the elevations.

[0046] For example, the insulation layer can be arranged after the first coil has been arranged in the recesses, e.g. as a potting compound, film, molded body or the like.

[0047] According to at least one embodiment, the inductive coil comprises a second coil or a plurality of further coils, in particular a second coil and a third coil, wherein the first coil and the further coils are each assigned to a phase of a multi-phase power transmission. The second coil or further coils are each configured correspondingly to the first coil, so that all features disclosed in connection with the first coil are also disclosed in connection with the second and further coils. For example, the first and further coils can be arranged on the carrier.

[0048] For example, the first coil is part of a first 120° segment, the second coil is part of a second 120° segment, and the third coil is part of a third 120° segment for a 360° segment of a three-phase inductive coil.

[0049] Furthermore, a method for producing an inductive coil is specified. The inductive coil system can be or is produced using the method described here. Thus, all features disclosed in connection with the inductive coil are also disclosed in connection with the method, and vice versa.

[0050] According to at least one embodiment of the method, a first coil material is provided.

[0051] According to at least one embodiment of the method, the first coil material is wound around a winding axis so that the first coil described here is produced on the carrier.

[0052] According to at least one alternative embodiment of the method, the first coil material is wound around a winding axis. The prefabricated coil is then inserted into the carrier during assembly.

[0053] The winding process is advantageously simplified because the individual turns can be wound in one direction, eliminating the need for a coil former or similar aid. The insulation layer can either be applied before the winding or bending process and / or applied directly to the first coil material as an inlay material and wound simultaneously with it. The insulation layer can also advantageously be used to determine and / or fix the spacing between the turns. Alternatively or additionally, a spacer material can be applied, allowing a three-layer structure to be wound directly.

[0054] Furthermore, an inductive coil system is specified. The inductive coil system can comprise the inductive coil described here. Thus, all features disclosed in connection with the inductive coil are also disclosed in connection with the inductive coil system, and vice versa.

[0055] According to at least one embodiment, the inductive coil system comprises a primary coil unit and a secondary coil unit, wherein the primary coil unit and / or the secondary coil unit comprises / comprises the inductive coil according to one of the preceding claims. In particular, the primary coil unit is characteristic of a mobile unit of an electric vehicle, and the secondary coil unit is particularly characteristic of a stationary unit. The inductive coil system is advantageously designed to transmit electrical energy from the primary coil unit to the secondary coil unit and vice versa.

[0056] Furthermore, a vehicle is specified. The vehicle can include the inductive coil system described here. Thus, all features of the embodiment disclosed in connection with the inductive coil system are also disclosed in connection with the vehicle, and vice versa.

[0057] Embodiments of the invention are explained in more detail below with reference to the schematic drawings.

[0058] They show: Fig. 1, Fig. 2, Fig. 3 and Fig. 4 each shows a schematic representation of an inductive coil according to an embodiment, Fig. 5 a schematic representation of an end region of an inductive coil according to an embodiment, Fig. 6 a vehicle with an inductive coil according to an embodiment.

[0059] Elements of the same design or function are marked with the same reference symbols throughout the figures.

[0060] The inductive coil 1 according to the embodiment of the Fig. 1 comprises a carrier 2 on which a first coil 3 is arranged. The first coil 3 is wound around a winding axis 12, wherein the winding axis 12 runs perpendicular to a main extension plane of the carrier 2. The main extension plane is parallel to lateral directions, and a vertical direction is perpendicular to the lateral directions. According to the embodiment of the Fig. 1, the first coil 3 comprises n=6 windings. In particular, a cross-section through the winding axis 12 along the lateral direction x is shown.

[0061] Segments 7 of the first coil 3 each have a polygonal, in particular rectangular, cross-sectional area. This advantageously allows for a particularly high degree of space filling and particularly small bending radii compared to round cable cross-sections, which advantageously leads to more compact coil dimensions. In particular, the polygonal, in particular rectangular, cross-sectional area can be used to optimize geometric dimensions at the coil height or in a plane perpendicular to it.

[0062] The embodiment of the Fig. Figure 2 shows a plan view along the vertical direction. The first coil 3 comprises an outer end region 4 and an inner end region 5, wherein the first coil 3 is wound around a winding axis 12 from the outer end region 4 to the inner end region 5. The segments 7 of the first coil 3 extend along a straight or slightly curved line. In particular, directly adjacent segments 7 are connected to one another by bends 8, characterized by small bending radii up to kinks.

[0063] Compared to coils with a round cable cross-section, more turns per winding level can be achieved with the same dimensions. This allows coils with a reduced number of winding levels, especially with a single winding level (single-level design), to be implemented in many applications.

[0064] The segments 7 are in the embodiment of the Fig. 2 arranged without overlap in lateral directions.

[0065] In contrast to the embodiment of the Fig. 1 and Fig. 2, the segments 7 in the embodiment of the Fig. 3 arranged stacked vertically on top of each other.

[0066] In particular, a spatial fullness and a geometry in multi-layer first coils 3, as in Fig. 3, can advantageously be optimized via an adapted cross-sectional area. In particular, such a first coil 3 with a polygonal, in particular quadrangular, cross-sectional area can advantageously be used for various coil topologies, such as circular coils, rectangular coils, double-D coils, and coils arranged side by side, in particular, for example, for multi-phase systems.

[0067] The inductive coil 1 according to the embodiment of the Fig. 4 comprises the support 2 with a structure 9, and the structure 9 comprises elevations 10. Between each two directly opposite parallel segments 7, an elevation 10 is arranged.

[0068] Such a carrier 2 and such a first coil 3 advantageously facilitate simpler production and winding of the first coils 3. In particular, particularly small bending radii can be realized, and insulation and / or spacer material can be introduced relatively easily between the segments 7. This advantageously eliminates the need for a coil carrier, and the elevations 10, in particular, eliminate the need for additional holding or spacing structures.

[0069] Insulation can be applied directly to the segments 7 of the first coil 3, and / or the insulation can be placed between them during the winding process. This advantageously allows for a gap between the coil windings.

[0070] The end region 4, 5 of the first coil 3 according to one of the Fig. 1, Fig. 2, Fig. 3 or Fig. 4 comprises a corresponding connection area 6 according to the embodiment of Fig. 5, which runs perpendicular to the main extension plane of the support 2 in the vertical direction.

[0071] In particular, with such a first coil 3, comparatively strong changes in direction, e.g. 90° bends, can be realized, advantageously by bending or by attaching suitable angle pieces by pressing, welding or soldering.

[0072] The vehicle 13 according to the embodiment of the Fig. 6 comprises the inductive coil 1, as in Fig. 1, Fig. 2, Fig. 3 and Fig. 4 described in more detail. List of reference symbols 1 inductive coil 2 carriers 3 first coil 4 outer end area 5 inner end area 6 Connection area 7 segments 8 Bend 9 Structure 10 surveys 12 winding axis 13 vehicles z vertical direction x, y lateral directions

Claims

[1] Inductive coil (1), comprising - a carrier (2) and - a first coil (3) arranged on the carrier (2), wherein - the first coil (3) comprises a plurality of conductor bundles, - each of the plurality of conductor bundles comprises a plurality of individual conductors and - all or some of the turns of the first coil (3) have a polygonal, in particular square or rectangular, cross-sectional area perpendicular to a main current direction. [2] Inductive coil (1) according to claim 1, wherein - the plurality of individual cables are stranded, in particular twisted, together to form sub-bundles and the sub-bundles to form bundles, and - the plurality of bundles are twisted, braided, crossed, interwoven or connected by similar methods, and - the majority of the individual lines or all of the individual lines are regularly led outwards into the area of ​​the outer surface of the winding. [3] Inductive coil (1) according to one of claims 1 or 2, wherein - the first coil (3) comprises two end regions, - the first coil (3) is wound around a winding axis (12) from one end region to the other, - the winding axis (12) runs perpendicular to a main extension plane of the carrier (2), - the end regions comprise an outer end region (4) and an inner end region (5) or two inner or two outer end regions, - the first coil (3) has connection areas and / or - one or more end regions with one or more connection regions (6) which run perpendicular to the main extension plane of the support (2). [4] Inductive coil (1) according to one of claims 1 to 3, wherein the first coil (3) comprises a current-carrying element, and -the cross-sectional area of ​​the current-carrying element has a main direction of extension, and - the cross-sectional area is oriented so that its main extension direction is vertical, and / or - the cross-sectional area is oriented so that its main extension direction is oriented in the direction of the surface normal of the coil surface. [5] Inductive coil (1) according to one of claims 1 to 4, wherein - the first coil (3) comprises a plurality of segments (7), and - each segment (7) extends substantially along a straight or slightly curved line, and - directly adjacent segments (7) are connected by short sections (8) with a small bending radius, - two directly opposite segments run almost parallel and / or - the first coil (3) has a polygonal shape in plan view. [6] Inductive coil (1) according to claim 5, wherein - the carrier (2) has a structure (9), - the structure (9) has a plurality of elevations (10) and - the elevations (10) are each arranged between two directly opposite parallel segments (7) and / or - an insulating layer is arranged between the elevations (10) and the directly adjacent segments (7). [7] Inductive coil (1) according to one of claims 1 to 6, further comprising - one or more further coils, in particular a second coil and a third coil, wherein - the first coil (3) and the further coils are each designed to be connected to a respective phase of a multi-phase electronic unit. [8] A method for manufacturing an inductive coil (1) according to any one of claims 1 to 7, comprising: - Providing a first coil material, and - Winding the first coil material around a winding axis (12) so that the first coil (3) is produced on the carrier (2), or - Winding the coil material in a preceding manufacturing step and inserting the first coil (3) onto or into the carrier (2) in a subsequent manufacturing step. [9] Inductive coil system comprising - a primary coil unit and - a secondary coil unit, wherein - the primary coil unit and / or the secondary coil unit comprises / comprises the inductive coil (1) according to one of the preceding claims. [10] Vehicle (13) comprising - the inductive coil according to one of claims 1 to 8.

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