Stator for an electric machine, and electric machine

Abstract

The application relates in particular to a stator for an electric machine, comprising stator poles arranged in a ring-shaped configuration defining a stator axis. The stator may include an interconnection board and a control board, both coupled to the stator poles and positioned on the same axial level relative to the stator axis. The stator poles are preferably equipped with windings configured to alternate the magnetic field polarity between adjacent poles. Groups of three consecutive stator poles are preferably interconnected through conductor tracks on the interconnection board.

Description

[0001] STATOR FOR AN ELECTRIC MACHINE, AND ELECTRIC MACHINE

[0002] The present disclosure generally relates to stators for electric machines, and more specifically to a stator design for enhancing electric motor efficiency and performance.

[0003] Reference is made to the earlier patent applications GB2400718.9 of 19 January 2024 and EP25152697 of 18 January 2025, the priorities of which are claimed in the present application and the contents of which are herein incorporated by reference.

[0004] DE 10 2012 013 740 A1 discloses an electric motor with stator windings and a printed circuit board for connecting the stator windings. The stator windings are connected by means of conductor tracks of the printed circuit board. The conductor tracks of the printed circuit board are designed in such a way, that they determine a type of connection of the stator windings.

[0005] US 2020 / 0274430 A1 discloses a double / twin radial air gap permanent magnet brushless motor. Specifically, it describes a stator assembly comprising nine individually modular pole modules mounted on a circuit board. The windings are secured using a single-piece circular ring.

[0006] WO 2021 / 005032 A1 discloses a stator for an electric machine. The stator comprises a stator core with teeth and windings where first coil ends are short-circuited via an interconnection element.

[0007] US 2010 / 0158723 A1 discloses an electrically commutated DC motor designed for a liquid pump. The motor features six axially aligned stator poles with windings mechanically secured to an insulation element. The design incorporates stacked circuit boards, which necessitate additional axial space for interconnections.

[0008] EP 1 271 748 B1 discloses a wheel drum motor with an inner stator portion and stator coil circuit board with solder holes for wire heads / tails.

[0009] The present application addresses the problem of improving the construction and functionality of a stator for an electric machine. This and other objects are solved by the subject matter of the independent claims. Further improvements are given by the dependent claims.

[0010] Specifically, the application provides solutions to reduce the overall size of an electric machine for a more compact design or to allow the creation of more powerful or larger electric machines for enhanced performance.

[0011] In this context, the application proposes a unique stator design in which advantageous measures in the positioning and construction of the control board, together with innovatively arranged and interconnected stator poles, particularly reduce the axial length of the stator and provide improved performance.

[0012] Further, the application discloses stator poles with end caps that function at least partially as carriers of stator windings. Each end cap may include wire guide grooves to facilitate the placement and organization of the stator windings. The end caps preferably feature both straight and curved sections with wire guide grooves in different radial sections of the stator pole. A number of layers of the stator windings can vary around the stator poles in the radial direction. The stator pole is preferably constructed using a plastic element, which may include metallic inlay elements in recesses, both on the inner and outer radial sides. The circuit board may include plated-through holes that are electrically connected to metallic connection elements, which can optionally be press-in parts or wire-catching parts.

[0013] The application also encompasses an electric machine with the improved stator and a method for manufacturing the stator using stator poles, end caps, stator plates, and conductor tracks on a conductive carrier element. The windings of the stator poles may be soldered or welded to a conductive carrier element or interconnection board, and the stator plate can be built using inlay elements in the recesses of the stator poles.

[0014] The proposed stator follows a modular approach, allowing the number of poles, winding patterns and printed circuit board (PCB) configurations to be adapted to different electric machine types and applications. This flexibility allows for customization in different use cases such as electric bicycles, fitness equipment and handheld devices.. Embodiments of the invention are associated with various advantages and / or technical effects.

[0015] In a first aspect the application refers to elements of positioning of the control board and the interconnection board on a same axial level, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described below.

[0016] The stator for an electric machine may comprise several stator poles being assembled in a ring-shaped arrangement defining a stator axis, an interconnection board and a control board being coupled to the stator poles.

[0017] Stator windings of the stator poles are preferably such configured, that a polarity of a magnetic field can be alternating from one stator pole to the next stator pole, wherein the stator windings of units of three consecutive stator poles each are interconnected by means of conductor tracks of the interconnection board. The interconnection board and the control board are preferably arranged on the same axial level with respect to the stator axis.

[0018] Placing the control board (CB) and the interconnection board (ICB) on the same axial level within the electric machine or integrating the control board (CB) and the interconnection board (ICB) to one common PCB, rather than stacking or axially separating them, offers several advantages. This arrangement can either reduce the overall size of the electric machine, resulting in a more compact design, or accommodate a larger, more powerful electric machine for higher performance.

[0019] For example, in an electric motor designed for an electric bicycle, this configuration may reduce axial space by 5-7 mm, enabling either a smaller motor design or a more powerful motor without increasing the overall size of the motor. It is apparent that when the proposed stator is used in the context of an electric motor, the control board is to be regarded as a motor control board (MCB).

[0020] Furthermore, the control board can be significantly better connected to the interconnection board and, consequently, to the stator poles. This is because the connection no longer needs to span an axial distance but can instead be established radially. As a result, the connection is substantially more stable and durable over time.

[0021] Moreover, the direct coupling of stator poles on the interconnection board (ICB) simplifies manufacturing and improves tolerances, further enhancing the overall reliability and efficiency of the design.

[0022] In the context of the application an interconnection board (ICB) may comprise a printed circuit board (PCB) designed to electrically and / or mechanically connect various components of the stator. Its primary purpose is to enable the efficient transfer of signals and power between the stator poles and the control board (CB), ensuring the reliable and optimal operation of the stator.

[0023] As described above, the interconnection board may feature conductor tracks that interconnect groups of stator windings, such as those of three consecutive stator poles, to facilitate the alternation of magnetic polarity. By integrating these connections into a single board, the interconnection board minimizes the need for external wiring, simplifies assembly, and enhances the electric machine's compactness and performance. Additionally, the interconnection board may serve as a mechanical support structure for the stator poles, contributing to overall stability and durability.

[0024] Through the interconnection board, the windings of the stator poles can be configured so that adjacent poles have opposite polarities. This capability to reverse pole polarity directly through the printed circuit board design eliminates the need for additional components. It enhances control and adaptability in electric machine applications, simplifies electrical configurations, and expands functional flexibility.

[0025] In a more abstract form, the interconnection board can also be regarded as a conductive carrier element. In the present application, the term "interconnection board" can be replaced with the term "conductive carrier element".

[0026] A conductive carrier element, in general, can be understood as including various types such as printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire and carbon nanotube network. In this regard, the application discloses a conductive carrier element utilized within a stator pole. The conductive carrier element may be arranged on end caps of stator poles that are configured to function at least partially as a carrier of the stator windings.

[0027] The used conductive carrier element may provide the advantage of modularity, allowing for easy assembly and disassembly of stator components. The carrier element's layered design supports efficient and organized placement of the stator windings, supporting improved performance and reliability. The carrier element's conductive properties facilitate the electrical interconnection of the stator poles, supporting a pre-determined power transmission throughout the electric machine with accurate and consistent polarity changes between the stator poles, resulting in efficient electric machine operation. The conductive carrier element is stable and supports a secure and reliable connection between winding wires and wire-catching or press-in parts, preventing or at least reducing any potential disconnections or failures before soldering or welding.

[0028] The control board (CB) may comprise a printed circuit board (PCB) printed circuit board (PCB) responsible for managing and regulating the operation of the electric machine. When the stator is used in an electric motor, the control board can be considered as a (MCB). It can interact with the stator poles, windings, and an interconnection board (ICB) to ensure optimal performance and efficiency. It is apparent that the motor control board may be connected to a power source, particularly a battery, and is capable of converting the direct current (DC) from the battery into three-phase alternating current (AC).

[0029] The stator poles are preferably arranged in a circular or ring-like formation, forming a closed loop. In this respect, the stator axis is an imaginary straight line running through the center of this ring-shaped arrangement, typically aligned with the rotational axis of the machine's rotor. In simpler terms, the stator poles are positioned in a circle around this central axis, creating a symmetrical and balanced configuration for efficient electromagnetic interaction with the rotor.

[0030] Being on the "same axial level" means these components are located at the same axis position, effectively lying in the same horizontal plane perpendicular to the axis. Instead of being stacked vertically or separated by a gap along the axis, the components are arranged side by side at an equal height, reducing the electric machine's overall axial length and improving compactness and connectivity.

[0031] The phrase "one stator pole to the next stator pole" may refer to the spatial arrangement of the stator poles in a circular or ring-shaped configuration within the stator of an electric machine. It may describe the direct adjacency of neighboring stator poles in this arrangement, emphasizing their sequential placement. This configuration typically allows for alternating magnetic polarities between adjacent poles, enhancing the electromagnetic interaction with the rotor and contributing to the machine's efficient operation.

[0032] The interconnection board and the control board may be integrated on a single, unified printed circuit board. This integration eliminates the need for a physical connection element, such as connectors or soldered joints, between the two boards, significantly reducing potential points of failure and enhancing overall reliability. Additionally, combining the interconnection board and the control board into one board reduces the manufacturing complexity, streamlines the assembly process, and minimizes the overall component count.

[0033] By incorporating multiple functionalities — such as power distribution, signal routing, and magnetic optimization — into a single PCB design, the proposed solution reduces the size and weight of the motor, enhancing its portability and market appeal. This compact design is particularly advantageous for applications like electric bicycles or handheld devices, where space is important. Furthermore, integrating control logic directly into the unified PCB eliminates the need for separate logic boards.

[0034] Generally, a printed circuit board may comprise a flat, insulating substrate onto which conductive pathways, known as conductor track or traces, are etched or printed. These pathways allow electrical signals and power to flow between components mounted on the board. By incorporating multiple layers, the unified printed circuit board increases its capacity to handle higher currents, ensuring efficient operation and improved thermal management in demanding. The layers of a printed circuit board may be interconnected through plated-through holes, commonly referred to as vias. These are small, cylindrical openings drilled into the board and coated with a conductive material, such as copper, to create electrical connections between layers. Vias can either extend through the entire board, connect an outer layer to one or more internal layers, or link only internal layers without reaching the surface. This interconnection system enables the seamless transfer of signals and power between components across the multiple layers of the board, ensuring efficient and reliable functionality.

[0035] Preferably, the unified printed circuit board comprises a plurality of layers, allowing it to efficiently manage higher current requirements.

[0036] For example, the unified printed circuit board may comprise at least six layers. This configuration allows for the accommodation of necessary conductor cross-sections without requiring an impractical increase in copper thickness, thereby adhering to practical manufacturing limits. Instead of using a single thick conductor track, multiple parallel conductor tracks with smaller cross-sections can be distributed across multiple layers. These parallel tracks together achieve a cross section equivalent to that of a thicker conductor track, while maintaining manufacturing feasibility.

[0037] In some embodiments, the unified printed circuit board may comprise at least eight layers.

[0038] This approach is particularly significant for the interconnection board, as connecting the stator poles necessitates conductor tracks with larger cross-sections. By distributing these tracks across multiple layers, the PCB design can effectively handle the current requirements without compromising reliability or manufacturability.

[0039] Although the control board or the control board section of the unified PCB does not inherently require as many layers, as the signals transmitted in this section do not demand large conductor cross-sections (the signals may be primarily low-power control signals or data transmission signals), there are advantages to using a single unified PCB with the required number of layers for the interconnection board.

[0040] In the control board or the control board section, not all layers may be fully utilized. Instead, only a portion of the available layers may be used, with the remaining layers left unused or allocated for other purposes. This approach simplifies production, as the same PCB stack-up can be used across the entire board, avoiding the need for separate manufacturing processes for different sections.

[0041] In this regard, the part of the unified printed circuit board assigned to the interconnection board may comprise conductor tracks in more layers than the part assigned to the control board.

[0042] In a preferred embodiment, the components of the interconnection board and the control board are spatially separated on the unified printed circuit board. For example, if the unified printed circuit board forms a ring-shaped disc, the part of the unified printed circuit board assigned to the interconnection board may be positioned radially outward and the part assigned to the control board may be positioned radially inward with respect to the stator axis. This ring-shaped design offers several advantages. It optimizes space usage within the electric machine, as the central opening of the ring-shaped PCB may accommodate the rotor shaft, allowing it to pass through the stator. This results in a more compact machine design while facilitating the seamless integration of the rotor.

[0043] Furthermore, the radial division offers advantages in heat dissipation. The outer section of the ring-shaped circuit board, designated for the interconnection board (ICB), carries higher energy in its conductor tracks compared to the inner section, which is allocated to the control board. Due to its position closer to the exterior of the stator, this outer section is more accessible for the implementation of cooling mechanisms, such as passive heat sinks or active cooling systems. This design ensures efficient heat removal, thereby improving thermal stability and extending the lifespan of the electrical components.

[0044] In an alternative embodiment, the interconnection board and the control board may be designed as separate printed circuit boards. In this configuration, both the interconnection board and the control board may take the form of ring-shaped discs that lie in the same plane. The interconnection board is preferably positioned radially outward, while the control board is preferably positioned radially inward with respect to the axis of the stator.

[0045] The interconnection board in a separate arrangement may comprise more layers than the control board. This allows the interconnection board to achieve larger conductor crosssections by distributing the conductor tracks across multiple layers in parallel. Conversely, a control board with a smaller number of layers can save material since large track cross sections are not required.

[0046] Preferably, the interconnection board and the control board may be located on an end face of the ring-shaped arrangement of the stator poles. This applies to both alternatives: when they are implemented on a unified PCB and when they are placed on two separate PCBs.

[0047] The end face of the ring-shaped arrangement may refer to one of the flat, circular surfaces at either axial end of a ring-shaped structure. In the context of a stator with a ring-shaped arrangement of stator poles, the end face is preferably the plane perpendicular to the axis of the stator and located at the top or bottom edge of the ring.

[0048] Each stator pole may comprise an end cap on each axial end section, wherein the end caps are configured to function at least partially as a carrier of the stator windings. Free ends of the stator windings can be mechanically clipped and fixed into receiving sections of the end caps. This configuration may simplify an assembly process and may reduce a number of separate components required, for example for providing a stator with alternating polarities.

[0049] The receiving sections in the end caps may be designed to ensure reliable and efficient fixation of the stator windings. They can include features such as integrated mechanisms that allow quick and secure insertion of the winding ends while ensuring proper alignment during assembly. In particular, the clip mechanism within the receiving section may be configured to provide a combination of secure mechanical fixation and ease of use. This may involve spring-loaded elements or snap-fit geometries that allow the winding ends to be inserted with minimal force while locking them firmly in place. Additionally, the clip mechanism can be designed to accommodate variations in winding diameter or material, ensuring robust and consistent performance across different assembly conditions.

[0050] Each end cap of the stator pole may feature a wire guide area with grooves, facilitating precise alignment and uniform placement of the stator windings. This design reduces electrical resistance, enhances the efficiency and performance of the windings, and optimizes the functionality of the electric machine. Furthermore, it simplifies the winding assembly process, minimizing errors and improving overall consistency.

[0051] The stator poles end caps may have an essentially straight end section with at least one, preferably two wire guide grooves in a radially outer section of the stator pole as well as a curved end section with one wire groove in a radially inner section of the stator pole. This feature allows for precise routing and positioning of the stator windings, optimizing the magnetic field and reducing electromagnetic interference.

[0052] In a further preferred embodiment, the end caps may be configured to function at least partially as a carrier of the stator windings. The stator pole described allows for a variation in the number of layers of the stator windings about at least some of the stator poles in the radial direction of the stator. In other words, a number of layers of the stator windings may vary at least partially about at least some of the stator poles in radial direction of the stator.

[0053] This flexibility in the winding configuration enables customization and optimization of the conductive carrier element or the interconnection board and the stator for different applications and performance requirements. By varying the number of layers of the stator windings, the electric machine or the stator can achieve improved power density and efficiency. This allows for the design of more compact and energy-efficient devices. The ability to vary the number of layers of the stator windings also provides enhanced control over magnetic field distribution, resulting in reduced cogging and improved overall machine performance.

[0054] For example, a number of wire windings on the radial outer side of the stator pole may be greater than on the radial inner side of the stator pole. This supports an improved efficiency and performance of the electric machine. The specific number of layers of stator windings in the stator design allows for improved heat dissipation, resulting in an electric machine with enhanced thermal management and increased operating efficiency.

[0055] The potting materials can be chose from a number of manufacturers, e.g. ELAN-TRON MC 5470 FR, ELANTAS, Camattini S.p.A., or ELAN-TRON W 5710, ELANTAS, Camattini S.p.A.

[0056] Preferably, a potting compound is at least partially arranged between the end cap and the stator winding. This compound, which may be made from resin or polymer materials such as epoxy, silicone, or polyurethane, serves multiple purposes. It may enhance mechanical stability by securing the stator winding in place, reducing the risk of movement or damage during operation. Additionally, it may improve thermal management by dissipating heat generated within the stator, promoting efficient operation and extending the lifespan of components. The potting compound may also provide protection against environmental factors like moisture, dust, and vibration, ensuring reliable performance under various operating conditions. By encapsulating the windings and filling gaps between components, it may reinforce the overall integrity and durability of the stator design.

[0057] A unit of stator poles may refer to a set or a group of stator poles, such as three consecutive poles, whose windings are interconnected via conductor tracks on the interconnection board. This arrangement facilitates efficient polarity alternation, enhances modularity, and simplifies manufacturing and assembly processes. The use of units underscores the modular nature of the stator design, enabling scalable and adaptable configurations based on the specific requirements of the electric machine.

[0058] In a multiphase power supply configuration, a first unit of stator poles is connected to phase A, a second unit to phase B, and a third unit to phase C. The phases A, B, and C are arranged to correspond with the requirements of the multiphase power supply, ensuring balanced operation and optimal electromagnetic performance.

[0059] The stator may comprise 18 stator poles, with two units of stator poles assigned to each of phases A, B, and C. The units assigned to phase A are interconnected, as are the units assigned to phase B and the units assigned to phase C. This interconnected arrangement ensures efficient energy distribution and enhances the overall functionality and reliability of the stator.

[0060] In a preferred embodiment the conductor tracks of the conductive carrier element or interconnection board may be configured in such a way that they connect stator windings of all stator poles to one another, wherein groups of three adjacent stator poles are connected so that the polarity of a magnetic field during operation of the electric machine with the stator alternates from one stator pole to the next stator pole.

[0061] The control board, particularly a motor control board, is preferably configured to supply the phases A, B, and C to the respective units of stator poles. By managing the distribution of the phases, the control board ensures precise operation of the stator, enabling effective electromagnetic interaction with the rotor and contributing to the efficient performance of the electric machine. In this context, the control board, or motor control board, is equipped with means to convert direct current (DC) from a battery, which serves as the power source, into a three-phase alternating current (AC) voltage. This conversion enables the generation of the required multiphase power supply for driving the stator and achieving optimal motor functionality.

[0062] The stator poles are preferably connected by means of electrically conductive stator plate elements in order to form a stator plate. This configuration provides several advantages. By connecting the stator poles through conductive stator plate elements, the mechanical stability and structural integrity of the stator assembly are enhanced. This design minimizes relative movement or misalignment between the stator poles during operation, which is particularly beneficial in high-speed or high-load applications. Additionally, the electrically conductive stator plate elements contribute to efficient electromagnetic performance by ensuring uniform magnetic flux distribution across the stator. This uniformity reduces losses and enhances the overall efficiency of the electric machine.

[0063] The stator pole may be built as a compound of a plastic element with stator plate elements formed as electrically conductive inlay elements being inserted in recesses of the plastic element in axial direction of the stator. The electrically conductive inlay elements may be arranged on the inner radial side and on the outer radial side of the stator pole.

[0064] This construction approach leverages the strengths of both materials: the plastic component provides a lightweight and insulating structure, while the electrically conductive inlay elements, preferably metallic, enhance the stator's strength and durability. The placement of the metallic inlay elements on both radial sides of the stator pole ensures a balanced magnetic field distribution, which contributes to smoother motor operation and reduced noise levels.

[0065] The composite design also results in an electric machine with reduced overall weight, improving portability. The plastic element offers improved insulation properties, effectively preventing electrical leakage and ensuring safe operation of the electric machine.

[0066] Furthermore, the symmetrical arrangement of metallic inlay elements on both radial sides of the stator pole minimizes energy losses and enhances the efficiency of the electric motor. This arrangement increases the magnetic flux density within the stator, thereby improving overall machine performance and delivering higher torque output.

[0067] Preferably, the interconnection board may comprise plated-through holes, wherein a metal layer of each plated-through hole is electrically connected to an electrically conductive connection element.

[0068] The plated-through hole may incorporate a snapping mechanism which allows stator poles or the end of a winding of the stator pole to clip directly into the interconnection board without soldering. This design enhances mechanical stability and simplifies the assembly process. By eliminating reliance on traditional soldering methods, it reduces both assembly time and production costs, making the process more efficient and cost- effective.

[0069] The snapping mechanism in the plated-through holes can be designed in various ways to ensure a reliable mechanical connection between the stator poles, and the interconnection board without the need for soldering. One approach involves incorporating flexible snap hooks within the holes, which bend slightly as the end of the windings of the stator poles are inserted and then lock into place to secure them firmly. Another possibility is to use spring-loaded elements that apply consistent pressure against the inserted winding ends, maintaining a stable connection. Alternatively, the holes could feature interlocking grooves or ridges that align with complementary features on the winding of the stator poles, creating a secure fit once the poles are inserted. Each of these designs ensures both mechanical stability and ease of assembly, allowing for a solderless, efficient connection. The connection element may comprise a press-in part pressed into the interconnection board, with an end region of a winding wire connected to a contact point being materially connected to the press-in part, in particular on the side facing away from the interconnection board. In some embodiments, the winding wire in a notch arranged in the press-in part or groove is inserted and can be welded or soldered.

[0070] A use of plated-through holes in the interconnection board or conductive carrier element allows for reliable electrical connections between the metal layers and metallic connection elements. The conductive connection elements, such as e.g. press-in parts, provide a secure and stable connection between the winding wires and the conductive carrier element or the interconnection board, supporting long-term reliability of the electric machine with the proposed stator.

[0071] The material connection between the winding wire of the stator winding and the press-in part, achieved through welding or soldering may enhance the electrical conductivity and mechanical strength of the connection.

[0072] The press-in parts used as connection elements provide a secure and stable connection between the winding wire and the conductive carrier element or interconnection board, preventing any potential disconnections or failures during operation.

[0073] In a further preferred embodiment, the connection element may comprise a conductor track section on an upper side of the interconnection board, with an end region of a winding wire connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0074] In some embodiments, the connection element may comprises a wire-catching part pressed into the interconnection board, the winding wire being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire being welded, in particular contact welded, to the wire-catching part. In other words, this is an alternative snapping mechanism and the free ends of the stator windings can be mechanically clipped and fixed into receiving sections of the carrier element before being soldered or welded. The wire-catching part pressed into the conductive carrier element provides a secure and reliable connection for the winding wire, preventing it from coming loose or getting damaged during manufacture or operation. The V-shaped catching section of the wirecatching part supports that the winding wire is held firmly in place, reducing a risk of any movement or displacement that could affect the performance of the electric machine. The contact welding of the winding wire to the wire-catching part ensures a strong and durable connection, minimizing the chances of any electrical or mechanical failure.

[0075] Furthermore, the stator is preferably configured to be used for an electric machine formed as: electric motor, electric generator. Its compact and discreet design makes it particularly suitable for electric bicycles, allowing better integration into bike frames while improved noise reduction enhances the overall user experience. In handheld devices, the smaller motor dimensions make the invention ideal for tools and portable equipment. Additionally, the stator offers reliable performance under sustained high loads, meeting the market's demand for durability in fitness equipment.

[0076] In a further preferred embodiment, an electric motor is provided that includes a stator according to any of the preceding embodiments, and a rotor rotatably arranged within the stator. In this embodiment, the control board functions as a motor control board.

[0077] In a further embodiment, the application refers to elements of a method for manufacturing a stator of an electric machine. The method for manufacturing a stator of an electric machine involves several steps.

[0078] First, stator poles with end caps on each axial end section of the stator poles may be provided. Next, a set of the stator poles in a ring-shaped arrangement defining a stator axis may be provided.

[0079] Following this, the stator poles can be connected by means of an electrically conductive stator plate. Stator windings may be then arranged on the stator poles, wherein ends of winding wires of units of consecutive three stator poles each are electrically conductive interconnected by means of conductor tracks of an interconnection board in such a way, that a polarity may change from one stator pole to the next stator pole. The next step involves coupling a control board to the stator poles and arranging the interconnection board and the control board on the same axial level with respect to the stator axis.

[0080] Optionally, the ends of the windings of the stator poles may be soldered or welded to the interconnection board and / or the stator plate can be built as stator plate elements in recesses of the stator poles.

[0081] The soldering or welding of the ends of the windings to the interconnection board supports a secure and stable connection, preventing any loose or weak connections that could affect the machine's performance. The use of soldering or welding reduces a need for additional connectors or fasteners, thus simplifying the manufacturing process and reducing costs. The soldering or welding process provides a strong and durable bond between the windings and the conductive carrier element, supporting long-term reliability and minimizing the risk of any electrical or mechanical failure.

[0082] The use of inlay elements for the stator plate in recesses of the stator poles provides a compact and space-saving design of the proposed stator, allowing for efficient use of materials and reducing the overall size and weight of the electric machine. The inlay elements ensure proper alignment and positioning of the stator plate, preventing any misalignment or movement that could affect the machine's performance. The recessed placement of the stator plate protects it from external factors such as dust, moisture, or physical damage, enhancing the durability and longevity of the electric machine.

[0083] The skilled person will recognize that the advantages, technical effects, and preferred embodiments discussed in connection with the stator may analogously apply to the method for manufacturing a stator. Similarly, all advantages, technical effects, and preferred embodiments described in connection with the method may be transferable to the stator.

[0084] In further aspects that refer to elements of the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below.

[0085] In this context, the stator for an electric machine may comprise several stator poles assembled in a grouped arrangement, wherein stator windings of said stator poles are configured such that the polarity alternates from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles are interconnected by means of conductor tracks of a conductive carrier element. By interconnecting the windings of three consecutive stator poles via conductor tracks on a conductive carrier element, this design simplifies manufacturing and assembly while ensuring precise alternation of magnetic polarity. This results in improved electromagnetic performance, reduced production complexity, and enhanced reliability of the electric machine.

[0086] Further, a method for manufacturing a stator of an electric machine is provided which comprises the following steps:

[0087] - providing stator poles with end caps on each axial end section of the stator poles;

[0088] - providing a set of the stator poles in a grouped arrangement;

[0089] - connecting the stator poles by means of an electrically conductive stator plate;

[0090] - arranging stator windings on the stator poles, wherein ends of winding wires of units of three consecutive stator poles each are electrically conductively interconnected by means of conductor tracks of a conductive carrier element in such a way that a polarity changes from one stator pole to the next stator pole.

[0091] The described method for manufacturing a stator is advantageous as it streamlines production by enabling automated or semi-automated assembly processes. The use of conductor tracks on a conductive carrier element eliminates complex manual wiring, reducing labor costs and potential errors. Furthermore, the grouped arrangement of stator poles and their secure connection via an electrically conductive stator plate ensure consistent quality and minimize manufacturing tolerances, resulting in a highly reliable stator design.

[0092] In further aspects that refer to elements of the variation of layers of the stator windings, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below. In this respect, the stator for an electric machine may comprise several stator poles being assembled in a grouped arrangement, wherein stator windings of said stator poles are configured such that a polarity alternates from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of a conductive carrier element, wherein a number of layers of the stator windings varies at least partially about at least some of the stator poles in radial direction of the stator.

[0093] By allowing the number of winding layers to vary radially across stator poles, it optimizes the magnetic field distribution and enhances the efficiency of the electric machine. Additionally, this flexibility supports tailored electromagnetic performance for specific applications, reduces material usage, and improves heat dissipation, contributing to a compact and reliable design.

[0094] A method for manufacturing a stator of an electric machine is provided. The method comprises the following steps:

[0095] - providing stator poles with end caps on each axial end section of the stator poles;

[0096] - providing a set of the stator poles in a grouped arrangement;

[0097] - connecting the stator poles by means of an electrically conductive stator plate;

[0098] - arranging stator windings on the stator poles, wherein ends of winding wires of units of three consecutive stator poles each are electrically conductively interconnected by means of conductor tracks of a conductive carrier element in such a way that a polarity changes from one stator pole to the next stator pole,

[0099] - wherein layers of the stator windings are arranged on the stator pole such that a number varies at least partially about at least some of the stator poles in radial direction of the stator.

[0100] By allowing the radial variation of winding layers, the method enables precise customization of the electromagnetic properties, enhancing the stator's performance for specific applications. Additionally, the structured grouping of stator poles and their interconnection via a conductive carrier element simplifies the assembly process, reduces production errors, and improves overall manufacturing efficiency. In further aspects that refer to elements of an end cap on each axial end section of each stator pole, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below.

[0101] The stator for an electric machine may comprise several stator poles being assembled in a grouped arrangement, wherein stator windings of said stator poles are configured such that a polarity alternates from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of a conductive carrier element. Each stator pole may comprise an end cap on each axial end section wherein the end caps are configured to function at least partially as a carrier of the stator windings.

[0102] The integration of end caps as carriers for the stator windings simplifies assembly by ensuring precise alignment and secure fixation of the windings. Additionally, the interconnection of windings via conductor tracks on a conductive carrier element minimizes manual wiring, enhances reliability, and reduces manufacturing complexity, while the alternating polarity configuration optimizes electromagnetic performance.

[0103] A Method for manufacturing a stator of an electric machine is provided which, may comprise the steps:

[0104] - providing stator poles with end caps on each axial end section of the stator poles, wherein each stator pole comprises an end cap on each axial end section, wherein the end caps are configured to function at least partially as a carrier of the stator windings;

[0105] - providing a set of the stator poles in a grouped arrangement;

[0106] - connecting the stator poles by means of an electrically conductive stator plate.

[0107] By utilizing end caps as carriers for the stator windings, the method ensures precise placement and secure fixation, reducing the likelihood of misalignment or damage during assembly. The grouped arrangement of stator poles, combined with their connection via an electrically conductive stator plate, streamlines the production process, enhances structural stability, and minimizes tolerances, leading to a more efficient and reliable manufacturing workflow. In further aspects that refer to elements of stator plate elements, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below.

[0108] In this context, the stator for an electric machine may comprise several stator poles being assembled in a grouped arrangement, wherein stator windings of said stator poles are configured such that a polarity alternates from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of a conductive carrier element, wherein the stator poles are connected by means of electrically conductive stator plate elements in order to form a stator plate. The connection of stator poles using electrically conductive stator plate elements enhances the mechanical stability and ensures consistent alignment, improving the stator's structural integrity.

[0109] A method for manufacturing a stator of an electric machine is provided, wherein the method comprises the steps:

[0110] - providing stator poles with end caps on each axial end section of the stator poles;

[0111] - providing a set of the stator poles in a grouped arrangement;

[0112] - connecting the stator poles by means of an electrically conductive stator plate;

[0113] - arranging stator windings on the stator poles, wherein ends of winding wires of units of three consecutive stator poles each are electrically conductively interconnected by means of conductor tracks of a conductive carrier element in such a way that a polarity changes from one stator pole to the next stator pole.

[0114] By connecting stator poles through an electrically conductive stator plate, the method ensures enhanced mechanical stability and precise alignment during assembly.

[0115] In further aspects that refer to elements of the polarity of the stator windings, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below.

[0116] In this relation, the stator for an electric machine may comprise several stator poles being assembled in a grouped arrangement, wherein stator windings of said stator poles are such configured, that a polarity of a magnetic field is alternating from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of a conductive carrier element. The conductor tracks of the conductive carrier element can be configured in such a way that they connect stator windings of all stator poles to one another, wherein groups of three adjacent stator poles are connected so that the polarity of a magnetic field during operation of the electric machine with the stator alternates from one stator pole to the next stator pole.

[0117] The configuration of conductor tracks on the conductive carrier element enables seamless interconnection of all stator windings, ensuring precise polarity alternation across the stator poles. This arrangement not only simplifies the wiring process and reduces assembly complexity but also enhances the magnetic field uniformity, improving the overall efficiency and reliability of the electric machine.

[0118] A method for manufacturing a stator of an electric machine is provided. The method may comprise the steps:

[0119] - providing stator poles with end caps on each axial end section of the stator poles;

[0120] - providing a set of the stator poles in a grouped arrangement;

[0121] - connecting the stator poles by means of an electrically conductive stator plate;

[0122] - arranging stator windings on the stator poles, wherein ends of winding wiresof units of three consecutive stator poles each are electrically conductively interconnected by means of conductor tracks of a conductive carrier element in such a way that a polarity changes from one stator pole to the next stator pole,

[0123] - wherein the conductor tracks of the conductive carrier element are configured in such a way that they connect stator windings of all stator poles to one another,

[0124] - wherein groups of three adjacent stator poles are connected so that the polarity of a magnetic field during operation of the electric machine with the stator alternates from one stator pole to the next stator pole.

[0125] In further aspects that refer to elements of the connection of the stator poles to the three phases A, B, and C, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below. The stator for an electric machine may comprise several stator poles being assembled in a grouped arrangement, wherein stator windings of the stator poles are such configured, that a polarity of a magnetic field is alternating from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of conductive carrier element, wherein a first unit of stator poles can be connected to phase A, a second unit to phase B, and a third unit to phase C, the phases A, B, and C are arranged according to a multiphase power supply.

[0126] By interconnecting the windings of three consecutive stator poles into units via conductor tracks on a conductive carrier element, the design ensures precise phase alignment for phases A, B, and C. This arrangement enhances the efficiency of electromagnetic interactions, facilitates balanced power distribution, and simplifies the integration of the stator into a multiphase electric machine.

[0127] In further aspects that refer to elements of a multi layer interconnecting board, various advantageous effects can be seen. These elements can be combined with the other elements in the present application as described above and below.

[0128] In this context, the stator for an electric machine may comprising several stator poles being assembled in a grouped arrangement, wherein stator windings of the stator poles are such configured, that a polarity of a magnetic field is alternating from one stator pole to the next stator pole. The stator windings of units of three consecutive stator poles each may be interconnected by means of conductor tracks of conductive carrier element, wherein conductive carrier element, is a printed circuit board comprising at least layers.

[0129] By utilizing a conductive carrier element in the form of a multilayer printed circuit board, the interconnection of stator windings across three consecutive poles is streamlined, reducing assembly complexity and improving reliability. The multilayer design supports efficient current distribution and enhanced thermal management, ensuring optimal performance and durability of the electric machine.

[0130] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above.

[0131] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to the variation of layers of the stator windings described above.

[0132] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above.

[0133] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to stator plate elements described above.

[0134] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to the polarity of the stator windings described above.

[0135] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above.

[0136] A further embodiment combines one or more elements of the aspect relating to the positioning of the control board and the interconnection board on a same axial level described above with one or more elements of the aspect relating to a multi layer interconnection board described above. A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to the variation of layers of the stator windings described above.

[0137] A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above.

[0138] A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to stator plate elements described above.

[0139] A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to the polarity of the stator windings described above.

[0140] A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above.

[0141] A further embodiment combines one or more elements of the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0142] A further embodiment combines one or more elements of the aspect relating to the variation of layers of the stator windings described above with one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above.

[0143] A further embodiment combines one or more elements of the aspect relating to the variation of layers of the stator windings described above with one or more elements of the aspect relating to stator plate elements described above.

[0144] A further embodiment combines one or more elements of the aspect relating to the variation of layers of the stator windings described above with one or more elements of the aspect relating to the polarity of the stator windings described above.

[0145] A further embodiment combines one or more elements of the aspect relating to the variation of layers of the stator windings described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above.

[0146] A further embodiment combines one or more elements of the aspect relating to the variation of layers of the stator windings described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0147] A further embodiment combines one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above with one or more elements of the aspect relating to stator plate elements described above.

[0148] A further embodiment combines one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above with one or more elements of the aspect relating to the polarity of the stator windings described above.

[0149] A further embodiment combines one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above. A further embodiment combines one or more elements of the aspect relating to an end cap on each axial end section of each stator pole described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0150] A further embodiment combines one or more elements of the aspect relating to stator plate elements described above with one or more elements of the aspect relating to the polarity of the stator windings described above.

[0151] A further embodiment combines one or more elements of the aspect relating to stator plate elements described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above.

[0152] A further embodiment combines one or more elements of the aspect relating to stator plate elements described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0153] A further embodiment combines one or more elements of the aspect relating to the polarity of the stator windings described above with one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above.

[0154] A further embodiment combines one or more elements of the aspect relating to the polarity of the stator windings described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0155] A further embodiment combines one or more elements of the aspect relating to the connection of the stator poles to the three phases A, B, and C described above with one or more elements of the aspect relating to a multi layer interconnection board described above.

[0156] The present disclosure is illustrated by way of example and not limited in the accompanying figures in which like reference numerals indicate similar elements. Embodiments of the application will now be described with reference to the attached drawings: Fig .1 shows a cross-section of three stator poles of the application.

[0157] Fig. 2 shows a top view of the three stator poles of Fig. 1 .

[0158] Fig. 3 shows a section view of stator poles of Figs. 1 & 2.

[0159] Fig. 4 shows a detailed section view of stator pole in Fig. 3.

[0160] Fig. 5 shows a perspective view of a stator of Fig. 3.

[0161] Fig. 6 shows a perspective view of an end cap of a stator of Fig. 1 .

[0162] Fig. 7 shows a further perspective view of the end cap of Fig. 6.

[0163] Fig. 8 shows a further perspective view of the end cap of Fig. 6 and 7.

[0164] Fig. 9a shows a perspective view of the proposed stator.

[0165] Fig. 9b shows a close-up of the upper side of the proposed PCB of the stator in Fig. 9a, showing the winding wire, conductor tracks, and V-shaped slots.

[0166] Fig. 10 shows a principal flow of a method for manufacturing a proposed stator on Fig. 9a.

[0167] Fig. 1 1 shows a circuit diagram that demonstrates how the numerous stator coils of the stator, shown in Fig. 9a, are interconnected on the interconnection board to form a three- phase motor.

[0168] Fig. 12 shows a circuit diagram of the stator of Fig. 9a, showing the grouping of the stator coils for the three-phase operation of the stator.

[0169] Fig. 13 shows a perspective view of stator poles of Fig. 1 . Fig. 14 shows the bottom view of the flexible interconnection board of the stator in Fig. 13.

[0170] Fig. 15 shows a close-up view of one of the through-holes on the flexible interconnection board, of Fig. 14, for the end of the winding wire.

[0171] Fig. 16 shows the bottom view of the flexible interconnection board of Fig. 13.

[0172] Fig. 17 shows the bottom view of the flexible interconnection board of Fig. 13.

[0173] Fig. 18 shows the close-up view of the flexible interconnection board, of Fig. 14, showing the plated through holes for the winding wire and the conductor tracks.

[0174] Fig. 19 shows a top view of the stator of Fig. 9a.

[0175] Fig. 20 shows a partial view of an embodiment of an electric motor with a stator in cross section.

[0176] Fig. 21 shows a partial view of an embodiment of an electric motor with a stator in cross section.

[0177] Fig. 22 shows a top view of the stator with the interconnection board and the control board on different PCBs, but on the same axial plane.

[0178] Fig. 23 shows a section of Fig. 1 1 that illustrates the differentiation in polarity among the various pole groups A, B, and C.

[0179] Fig. 24 shows a shared plastic body for providing a single large connector.

[0180] Some parts of the embodiments have similar or identical parts. The similar or identical parts may have the same names and / or reference number. The description of one part applies by reference to another similar part, where appropriate, thereby reducing repetition of text without limiting the disclosure. Fig. 1 shows a cross section of three stator poles 10, wherein winding wires 21 of stator windings 20 on said stator poles may be interconnected by a conductive carrier element 30. The conductive carrier element 30 can, for example, be formed as a printed circuit board (PCB) or a printed wiring board, which are essential components in modern electronic devices, providing mechanical support and electrical connections for electronic components.

[0181] There exist numerous alternatives and equivalents to these PCBs, each serving similar functions in different ways. Furthermore, the conductive carrier element 30 can be formed as a point-to-point construction, which involve directly connecting electronic components with wire without a standard board. This method is more labor-intensive and less reliable for complex circuits. Moreover, the conductive carrier element 30 can be formed as a wire wrap, where wires are wrapped around the leads of components.

[0182] Moreover, the conductive carrier element 30 can also be formed as a breadboard, which is used for prototyping and are a temporary setup where components can be inserted into a grid of holes interconnected with conductive strips. As a further alternative, also flexible circuits can be used as conductive carrier element 30. These are like PCBs, but use flexible materials, allowing the board to bend. They are often used in applications where space is a constraint or where the board needs to conform to a specific shape. Also, molded interconnect devices (Ml Ds) can be used as conductive carrier elements 30. These combine the mechanical and electrical functions in a single unit, with conductive pathways being part of the 3D structure of the component. Also, nanowire and carbon nanotube networks can be used as conductive carrier elements 30. In advanced electronics research, these materials are being explored as alternatives to traditional conductive traces on PCBs, especially for miniaturized and flexible devices electrical connection are made through connection elements 14 in the conductive carrier element 30.

[0183] The stator 2 may comprise several stator poles 10 assembled in a grouped, preferably ring-shaped arrangement. The stator windings 20 of the stator poles 10 are preferably configured in such a way that a polarity alternates from one stator pole to the next stator pole. Units of three consecutive stator poles 10 each may be interconnected by means of conductor tracks 32 of a conductive carrier element 30. Each stator pole 10 may comprise an end cap 11 on each axial end section, which functions at least partially as a carrier of the stator windings 20. The end caps 1 1 may have wire guide areas with wire guide grooves 15. The stator windings 20 may have a varying number of layers around some of the stator poles 10 in the radial direction of the stator 2.

[0184] The conductive carrier element 30 may comprise plated-through holes 31 , where a metal layer of each plated-through hole 31 is electrically connected to an electrically conductive, preferably metallic connection element 14. The metallic connection element 14 can be a conductor track section on an upper side 34 of the conductive carrier element 30, with an end region of a winding wire connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0185] Alternatively, the connection element 14 can be a press-in part pressed into the conductive carrier element 30, with an end region of a winding wire 21 connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the conductive carrier element 30, in particular with the winding wire 21 in a notch arranged in the press-in part or groove is inserted and is welded or soldered. Another alternative is a wire-catching part pressed into the conductive carrier element 30, where the winding wire 21 is held between two legs of a V-shaped catching section of the wire-catching part, and the winding wire 21 is welded, in particular contact welded, to the wire-catching part.

[0186] A method for manufacturing the proposed stator 2 may include providing stator poles with end caps 1 1 , arranging the stator poles 10 in a grouped arrangement, connecting the stator poles 10 with an electrically conductive stator plate, and arranging stator windings 20 on the stator poles 10. The ends of the winding wires 21 of units of three consecutive stator poles 10 each are electrically conductively interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way, that the polarity changes from one stator pole 10 to the next stator pole 10. The ends of the winding wires 21 of the stator poles 10 can be soldered or welded to the conductive carrier element 30. The stator plate 110 can be built as a summary of inlay elements 13 in recesses 12 of the stator poles 10. Fig. 2 shows a top view of three stator poles 10 with stator windings 20 wound on the stator poles 10, the ends of the winding wires 21 being fixed by wire grooves 15 of end caps 11 on the stator poles 10. The stator 2 may comprise several stator poles 10 assembled in a ring-shaped arrangement. In an alternative (not shown in figures), the several stator poles 10 can also be assembled in a line shaped arrangement for the purpose of use in a linear motor. The stator windings 20 of the stator poles 10 are configured in such a way, that the polarity alternates from one stator pole to the next stator pole. Units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 (not shown) of the conductive carrier element 30 (not shown in Fig. 2).

[0187] Each stator pole 10 comprises an end cap 1 1 on each axial end section 18, 19. The end caps 1 1 are configured to function at least partially as a carrier of the stator windings 20. Each end cap 11 also comprises a wire guide area with wire guide grooves 15. The wire guide grooves 15 are positioned in an essentially straight end section of the end cap 11 having two wire guide grooves 15 in a radially outer section 17 of the stator pole 10 and a curved end section having one wire groove 15c in a radially inner section 16 of the stator pole 10.

[0188] A number of layers of the winding wires 21 , seen from the surface of the end cap 1 1 on a radially outer side 17 of the stator pole 10 may be greater than a number of layers of winding wires 21 on a radial inner side 16 of the stator pole, as shown in Fig. 2. In this way, beneficial effects with respect to an electromagnetic field, torque curve, etc. of the electric machine are available. There are numerous possibilities to specify said different number of layers, such that the arrangement shown in Fig. 2 is only exemplary. The stator poles 10 are connected by means of electrically conductive (e.g. metallic) stator plate elements 13 to form a stator plate 110. In this way, the stator poles are built as compounds of a plastic elements with metallic inlay elements being inserted in recesses 12 of the plastic element in the axial direction of the stator 2. The metallic inlay elements 13 are arranged on the inner and outer radial sides 16, 17 of the stator pole 10. Fig. 2 does not show a rotor, but it should be understood that the stator 2 is part of an electric machine being formed as an electric motor or an electric generator with a rotor rotatably arranged within the stator 2. Fig. 3 shows a sectional view of the stator poles 10, having electrically conductive (preferably metallic) stator plate elements 13 arranged in recesses 12 of the stator poles 10 to form a stator plate 110 with the entirety of the stator poles 10. It can be seen that the ends of the winding wires 21 are fixed by wire grooves 15 of the end caps 11 to be connected by means of conductor tracks 32 of a conductive carrier element 30 (not shown).

[0189] Fig. 3 shows, that the stator poles 10 comprise end caps 1 1 on each axial end section 18, 19 of the stator poles 10. The end caps 1 1 function as carriers for the stator windings 20 and include wire guide areas with wire guide grooves 15. The end caps 11 have an essentially straight end section with e.g. two wire guide grooves 15 in the radially outer section 17 of the stator pole 10, and a curved end section with e.g. one wire groove 15 in the radially inner section 16 of the stator pole 10.

[0190] The stator poles 10 are connected by means of conductive stator plate elements 13 to form a stator plate 1 10. In this way, the stator pole 10 is built as a compound of a plastic element with conductive inlay elements 13 inserted in recesses 12 of the plastic element in the axial direction of the stator 2. The conductive inlay elements 13 are arranged on the inner and outer radial sides of the stator pole 10.

[0191] Referring to Fig. 4 now, a sectional view of a stator pole 10 with winding wires 21 on an end cap 1 1 is shown. A number of layers of winding wires 21 of the stator winding 20 varies at least partially about some of the stator poles 10 in the radial direction of the stator 2 as can better be seen in Fig. 2.

[0192] Fig. 5 is a perspective view of a proposed stator 2, comprising stator poles 10 in a circular arrangement, wherein electrically conductive plate elements 13 are connected to form a complete stator plate 110. Winding wires 21 of a stator winding 20 can be seen emerging from a top side 18 of the stator poles 10, which are to be connected by conductor tracks 32 of the conductive carrier element 30 (not shown in Fig. 5). One recognizes an assembly of the stator poles 10 in a ring-shaped arrangement. Each stator pole 10 is equipped with an end cap 1 1 on both axial ends, that is on a top side 18 and on a bottom side 19, which function at least partially as carriers for the stator windings 20. The end caps 1 1 have wire guide areas with wire guide grooves 15. The stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 on the conductive carrier element 30. The figure also depicts the connection of the stator poles 10 using electrically conductive stator plate elements 13 to form a stator plate 110.

[0193] The stator poles 10 are built as compounds of plastic elements with electrically conductive inlay elements 13 inserted in recesses 12 of the plastic element.

[0194] The winding wires 21 of the stator winding 20 may be wound in one single direction, e.g. from left to right or from right to left, which simplifies the production of the stator winding 20. Afterwards, the stator poles 10 are connected by the stator winding 20 in such a way, that a polarity changes from one stator pole 10 to the next stator pole 10. The stator is then finished by connecting the winding wires 21 with the conductive carrier element 30 as described above. Finally, a rotor (not shown) is rotatably arranged inside the stator 2. In this way, an electric machine (e.g. motor, generator) is provided with the described stator design, where a rotor is rotatably arranged within the stator 2.

[0195] Fig. 6 shows a perspective view of an end cap 11 with wire grooves 15 for fixing ends of winding wires 21 to be connected by conductor tracks 32 of a conductive carrier element 30 (not shown in Fig. 6). The end cap 1 1 can be made by synthetic material or plastic, respectively, and comprises a substantially straight end portion having e.g. two wire grooves 15 in a radially outer portion 17 of the stator pole and a curved end portion having a wire groove 15 in a radially inner portion 16 of the stator pole. A radially outer side of the end cap 11 has a substantially straight end section and a radially inner side of the end cap 11 has a substantially curved end section.

[0196] Fig. 7 shows the further perspective view of an end cap 1 1 of the stator pole 10 with wire grooves 15 for fixing and leading ends of the wire windings 21 to be electrically conductively connected by conductor tracks 32 of the conductive carrier element 30 (not shown in Fig. 7). One recognizes a recess 12, into which an electrically conductive stator element 13 (not shown) is to be inserted. Fig. 8 shows a further perspective view of the end cap 11 of Figs. 6 and 7. The stator pole 10 comprises an essentially straight end section with e.g. two wire guide grooves 15 on a radially outer section 17 of the stator pole 10, and a curved end section with e.g. one wire groove 15 in a radially inner section 16 of the stator pole 10. The end caps 11 are designed to function at least partially as a carrier of the stator windings 20.

[0197] Fig. 9a shows a perspective view of a complete stator 2 with a number of stator poles 10 formed in a circular arrangement and wound with winding wires 21 on said stator poles 10, which are to be electrically connected by conductor tracks 32 of the conductive carrier element 30. One recognizes, that electrically conductive plate elements 13 build a complete state plate 1 10.

[0198] Furthermore, in Fig. 9b, an upper side 34 of a conductive carrier element 30 is depicted. The conductive carrier element 30 may, for example, be formed as a printed circuit board, also referred to as an interconnection board 300. The upper side 34 features conductor tracks 32 that connect the ends of wire windings 21. The arrangement shown in Fig. 9 represents a stator 2 designed for an electric machine, which can be utilized either as an electric motor or as an electric generator. In particular, the stator 2 is well-suited, in combination with a hollow-shaft rotor, to form a frameless hollow-shaft motor for applications in automation technology, robotics, manufacturing, and other fields.

[0199] It can also be observed that end caps 11 are mounted on the upper side 18 and the bottom side 19. These end caps 11 are used to facilitate the mounting of the stator windings 20.

[0200] Fig. 10 shows a main flow of a method of manufacturing a stator 2 for an electric motor, comprising method steps 200 to 230.

[0201] In a step 200 stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10 are provided.

[0202] In a step 210, a set of the stator poles 10 is provided in a grouped arrangement. In a step 220, the stator poles 10 are connected by means of an electrically conductive stator plate 1 10.

[0203] In a step 230, stator windings 20 are arranged on the stator poles 10, wherein ends of wire windings 21 of units of three consecutive stator poles 10 each are electrically conductive interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way, that a polarity changes from one stator pole 10 to the next stator pole 10.

[0204] In summary, the present disclosure relates, among other aspects, to a stator 2 for an electric machine, comprising stator windings 20 and a conductive carrier element 30 for interconnecting the stator windings 20, as well as to a method for manufacturing such an electric machine.

[0205] Advantageously, the proposed stator 2 may simplify a production of an electric machine. Conductor tracks 32 of the conductive carrier element 30 are designed in such a way that they provide connections between the stator windings 20 of the various stators or anchors, respectively, namely a series connection of stator windings in packages of three anchors, such that the polarity of the anchors changes from one anchor to the next anchor.

[0206] The stator wiring is electrically connected by means of the conductive carrier element 30 in the form of the printed conductor structure and can therefore be mass-produced in a simple and error-free manner. In this way, manual work can also be reduced, in particular a fully automatic interconnection can be carried out.

[0207] As not shown in figures, a magnetic rotor of an electric machine is located in a stator 2 at the symmetry line or the stator axis, which can rotate inside the stator 2. In this way, a so-called "frameless hollow shaft motor" is provided, which refers to an electric motor that is designed without an outer frame (frameless) and has a hollow shaft. This type of electric motor can be very compact and can be used in applications where space is a limited resource and high torque is required while maintaining low weight and volume. Since such an electric motor does not have an external frame, it can be designed to be very compact. This may especially be useful in applications where the available space is limited. The hollow shaft in the middle of the electric motor allows other components such as shafts, cables, or even air or fluids, etc. to pass through the motor. This may especially be useful in applications where axial feedthrough is required. The design without an outer frame can help reduce the weight of the electric motor, which is especially important in applications with weight constraints. The frameless hollow shaft motors can have a high torque density, which means that they are capable of delivering a lot of torque relative to their size. Such motors are e.g. used in various applications, including robotics, aerospace, medical devices, precision instruments, and other areas where space and weight are critical factors.

[0208] An example of an assembly process of an electric machine with a stator 2 according to the present disclosure is described in the following. Firstly, the stator 2 is wound with a stator winding 20. The conductive carrier element 30 (e.g. printed circuit board) has V- shaped slots 33. To assemble, ends of winding wires 21 are clipped into the slots 33 of the conductive carrier element 30. The ready wound stator 2 is then put into a housing, and a rotor having a hollow rotor shaft is arranged inside the stator 2. Additional elements and devices, e.g. control electronics, mechanical elements, gears, etc. are also mounted. Finally, the housing of the electric motor is closed, e.g. by means of screws.

[0209] Fig. 1 1 illustrates a circuit diagram that demonstrates how the numerous stator coils 20 of the stator 2, shown for example in Fig. 9a, are interconnected on the interconnection board 300 to form a three-phase motor.

[0210] The motor is typically powered by a battery that provides direct current (DC). Through a motor control board or a control board 320, this DC is converted into three-phase alternating current (AC) to supply the stator 2. The motor control board 320 coupled to the interconnection board 300, which serves as an interface between the control board 320 and the stator windings 20. The control board 320 supplies the three phases, labeled as XU (A), XV (B), and XW (C), to the stator windings 20 via the interconnection board 300.

[0211] The stator windings 20 are grouped and interconnected on the interconnection board 300 in such a way that adjacent stator poles 10 of the different pole groups XU (A), XV (B), and XW (C) always have opposite polarities. This arrangement creates a uniform electromagnetic field, enabling efficient motor operation.

[0212] For instance, phase A of the control board 320 is connected to the second end 23 of the winding 20 of stator pole A1 . The first end 22 of this winding 20 is connected to the first end of A2, whose second end is further connected to the second end of A3. This sequence continues, connecting the first end of A3 to the first end of A4, the second end of A4 to the second end of A5, and the first end of A5 to the first end of A6. Finally, the second end of A6 is connected to a neutral point.

[0213] Similarly, phase B is connected to the windings of stator poles B1 through B6 via the interconnection board 300. The first end of B1 is connected to phase B, the second end of B1 is connected to the second end of B2, the first end of B2 is connected to the first end of B3, and this pattern continues until the first end of B6 is connected to the neutral point.

[0214] Phase C follows the same pattern, with the first end of C1 connected to phase C, the second end of C1 connected to the second end of C2, the first end of C2 connected to the first end of C3, and so on, until the first end of C6 is connected to the neutral point.

[0215] This interconnection configuration corresponds to a star connection, or Y-connection. In this arrangement, the ends of all three phases are joined at a common point — the neutral point — while the other ends of the phases remain connected to the alternating current outputs of the control board 320. This setup ensures balanced current distribution and stable motor operation.

[0216] Fig. 12 shows a circuit diagram of the stator 2, as for example depicted in Figure 9a, illustrating the grouping of stator coils 20 configured for three-phase operation within the stator 2.

[0217] As previously described, the stator 2 of an electric machine comprises multiple stator poles 10. An interconnection board 300 and a control board 320 are coupled to the stator poles 10. Each stator pole includes stator windings 20 configured to produce an alternating polarity of the magnetic field between adjacent stator poles 10. The stator windings 20 of three consecutive stator poles 10 are interconnected as a unit using conductor tracks 32 on the interconnection board 300 or, more generally, on a conductive carrier element 30.

[0218] A first unit of stator poles 10 is connected to phase A, a second unit to phase B, and a third unit to phase C. The phases A, B, and C correspond to the multiphase power supply provided by the motor control board 320.

[0219] In this configuration, the stator 2 comprises 18 stator poles, with two units of stator poles 10 assigned to each of the phases A, B, and C.

[0220] One distinction between Fig. 1 1 and Fig. 12 lies in the arrangement and implementation of the stator poles. In Fig. 1 1 , the individual poles are reconfigured based on optimization criteria such as torque enhancement or reduction of resistive forces. Fig. 12 illustrates the adaptation of motor bridges within a three-pole package (e.g., X1 A1 to X1 A2 for poles 1 -6) on the interconnection board PCB, which is implemented using three distinct individual poles.

[0221] Fig. 13 shows a perspective view of stator poles of Fig. 1 . The conductive carrier element 30 may be designed as an interconnection board 300, positioned on an end face of the ring-shaped arrangement of the stator poles 10.

[0222] The stator poles 10 are connected using electrically conductive stator plate elements 13 to form a stator plate 1 10. Each stator pole 10 is constructed as a composite structure, comprising a plastic element with stator plate elements 13. These stator plate elements 13 are electrically conductive inlay components inserted into recesses 12 of the plastic element in the axial direction of the stator 2.

[0223] Moreover, each stator pole 10 is equipped with an end cap 11 at both axial end sections 18 and 19. These end caps 11 are designed to partially serve as carriers for the stator windings 20. The interconnection board 300 features plated-through holes 31 , each of which includes a metal layer electrically connected to an electrically conductive connection element 14. Through the plated-th rough holes 31 , the first and / or second end 22, 23 of a winding wire 21 can be guided and securely positioned. These ends can be electrically connected via conductive connection elements 14 on the interconnection board 300, which may be configured as conductive tracks 32 for electrical routing.

[0224] Fig. 14 shows a bottom view of the flexible interconnection board 300 of the stator 2 depicted in Fig. 13. In particular, the connections 40 for phases A, B, and C are positioned at the bottom of the interconnection board 300.

[0225] Additionally, through-holes 50 are provided, which allow the interconnection board 300 to be securely mounted to the stator poles 10 and / or to a housing.

[0226] Fig. 15 shows a close-up view of one of the through-holes 31 on the flexible interconnection board 300 of Fig. 14, for the end 22, 23 of the winding wire 21. The through-hole 31 is located near the connection 40 corresponding to one of the phases A, B, or C.

[0227] Preferably, a connection element 14 is a wire-catching part pressed into the conductive carrier element, the winding wire 21 being held between two legs of the wire-catching part, the winding wire 21 being soldered or welded, in particular contact welded, to the wire-catching part.

[0228] In other words, the plated-through hole 31 may incorporate a snapping mechanism which allows stator poles 10 or the end 22, 23 of a wire winding 21 of the stator pole 10 to clip directly into the interconnection board 300.

[0229] In a development, a connection element 14 is a press-in part pressed into the interconnection board 300, wherein the interconnection board 300 is a flat board that holds electronic components in layers that interconnect via copper pathways, often called traces, with an end region 22, 23 of a winding wire 21 connected to a contact point being materially connected to the press-in part, in particular on the side facing away from the interconnection board 300, in particular with the winding wire 21 in a notch wherein a notch is an indentation arranged in the press-in part or groove is inserted and is welded or soldered.

[0230] Fig. 16 and Fig. 17 both show the bottom view of the flexible interconnection board 300 of Fig. 13. In these figures, the connections 40 for phases A, B, and C are not attached. Instead, the mounting holes 41 are visible, which serve as attachment points for the connections 40, which can be formed as clamps or similar fastening elements.

[0231] Fig. 18 shows the close-up view of the flexible interconnection board 300, of Fig. 14, showing the plated through holes 31 for the winding wire 21 .

[0232] Fig. 19 shows a top view of the stator of Fig. 9a. The interconnection board 300 is designed as a ring-shaped disc and is mounted on the end face of the stator poles 10. All stator poles 10 are preferably interconnected into units via the interconnection board 300.

[0233] Fig. 20 shows a partial view of an embodiment of an electric motor 1 with a stator 2 in cross section, where the interconnection board 300 and a control board 320 are arranged parallel to each other, separated by an axial distance. The interconnection board 300 and the control board 320 are preferably connected to each other by wires. The interconnection board 300 is preferably directly mounted on the stator poles 10 and coupled to the stator windings 20. The first or second end 22,23 of the winding wires 21 is preferably guided through wire guides 15 and connected to the interconnection board 300.

[0234] Fig. 21 depicts another embodiment of an electric motor 1 with a stator 2, where the interconnection board 300 and the control board 320 are arranged on the same axial level with respect to the stator axis. In this embodiment, the interconnection board 300 and the control board 320 are integrated into a single, unified printed circuit board comprising at least six layers.

[0235] The interconnection board 300 and the control board 320 are preferably positioned on the end face of the ring-shaped arrangement of the stator poles 10. The part of the unified printed circuit board assigned to the interconnection board 300 includes preferably conductor tracks 32 in more layers compared to the part assigned to the control board 320. The unified printed circuit board forms a ring-shaped disc, with the portion assigned to the interconnection board 300 positioned radially outward and the portion assigned to the control board 320 positioned radially inward with respect to the stator axis.

[0236] This arrangement offers additional space within the motor, enabling either a more compact motor design or an enlarged stator, which can provide higher performance.

[0237] Fig. 22 illustrates a further embodiment of the design shown in Fig. 21. In this version, both the interconnection board 300 and the control board 320 are designed as separate printed circuit boards, each forming a ring-shaped disc. The interconnection board 300 is positioned radially outward, while the control board 320 is positioned radially inward relative to the stator axis.

[0238] The interconnection board 300 comprises of more layers than the control board 320. Both boards are arranged on the end face of the ring-shaped configuration of the stator poles 10.

[0239] Fig. 23 shows a section of Fig. 1 1 that illustrates the differentiation in polarity among the various pole groups A, B, and C. The flux directions (also called “current directions”), indicated by blue arrows, are further clarified using magenta markings within the diagram. This representation aligns with the circular arrangement of the 18 stator poles, as depicted in the interconnection layout described above. Gray arrows denote uniform polarity within a single pole group, facilitating understanding of the electrical characteristics and their relation to the stator's operational configuration.

[0240] Blue arrows are directed as follows: from (A1 , 1 ) to (A2, 1 ) at A1 , from (A2, 2) to (A3, 2) at A2, from PHASE C to (C1 , 1 ) at C1 , from (C1 , 2) to (C2, 2) at C1 , from PHASE B to (B1 , 1 ) at B1 , from (B1 , 2) to (B2, 2) at B2, from (A3, 1 ) to (A4, 1 ) at A3, from (A2, 2) to (A3, 2) at A3, from (02, 1 ) to (C3, 1)atC2, from (03, 2) to (04, 2) at 03, from (B2, 1) to (B3, 1)atB3, from (B3, 2) to (B4, 2) at B3, from (A3, 1) to (A4, 1) at A4, from (A4, 2) to (A5, 2) at A5, from (C4, 1 ) to (C5, 1)atC4, from (C3, 2) to (C4, 2) at C4, from (B4, 1) to (B5, 1) at B4, from (B5, 2) to (B6, 2) at B5, from (A5, 1) to (A6, 1) at A6, from (C4, 1 ) to (C5, 1)atC5, from (C5, 2) to (C6, 2) at C6, from (B6, 1) to (A6, 2) at B6, and from (B5, 2) to (B6, 2) at B6.

[0241] Gray arrows are directed as follows: from PHASE A to (A1 , 2) at A2, from (A1, 1) to (A2, 1) at A2, from (B1, 2) to (B2, 2) at B1, from (B2, 1) to (B3, 1) at B2, from (C1 , 2) to (C2, 2) at C2, from (C2, 1 ) to (C3, 1)atC3, from (A4, 1) to (A5, 2) at A4, from (A5, 1) to (A6, 1) at A5, from (B3, 2) to (B4, 2) at B4, from (B4, 1) to (B5, 1)atB5, from (C5, 2) to (C6, 2) at C5, and from (C6, 1) to (B6, 1) and to (A6, 2) at C6,

[0242] Fig.24 shows a shared plastic body for providing a single large connector. The holes 50 shown in Fig. 14 must be distinguished by their specific function. The holes labeled as 50A are utilized for precise positioning when the three individual contacts 40 are integrated into a single large connector via the shared plastic body. For this purpose, the plastic body features two pins, each of which engages with one of the two holes 50A to ensure accurate alignment. Fig. 24 shows only a part of this arrangement, symmetric elements are left away here.

[0243] The above embodiments in the application can also be described using the Itemized lists below. It should be noted that more than the above shown embodiments are disclosed in the present application. These embodiments may be implemented by combining features of any of the items below.

[0244] Reference is made to the earlier patent applications GB2400718.9 of 19 January 2024 and EP25152697 of 18 January 2025, the contents of which are herein incorporated by reference. Protection may be sought for combinations of features which are disclosed in these reference documents. It is disclosed there how these features combinations contribute to achieving the technical aim of the present application and they are thus comprised in the solution of the technical problem underlying the subject matter of the present application. The features combinations which are disclosed in the reference documents implicitly belong to the description of the subject matter in the present application and thus to the content of the present application as filed.

[0245] For example, there are embodiments presented, each combining two features or elements of the subject matter of the present specification. It is also possible to combine two or more examples or embodiments, especially if they share a common feature or element. Such combinations inherit the advantages and technical effects of the examples or embodiments being merged. Furthermore, these combined examples or embodiments can also be extended by adding other examples or embodiments when they share one or more common features or elements. This allows for extended combinations that provide benefits of the examples or embodiments involved. These combinations focus on feature pairs, so-called "feature tuples". Any feature pair can be combined with others, and the individual features within these pairs can also be freely rearranged in different configurations.

[0246] The first itemized list refers to the aspect relating to the arrangement of stator poles in a circuit board to facilitate manufacturing and to improve manufacturing tolerances. The items of the first itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims.

[0247] First itemized list:

[0248] Item l : Stator 2 for an electric machine, comprising several stator poles 10 assembled in a grouped arrangement, wherein stator windings 20 of said stator poles 10 are configured such that the polarity alternates from one stator pole 10 to the next stator pole 10, wherein stator windings 20 of units of three consecutive stator poles 10 are interconnected by means of conductor tracks 32 of a conductive carrier element 30.

[0249] Item 2: Stator 2 according to item 1 , characterized in that each stator pole 10 comprises an end cap 1 1 on each axial end section 18, 19, wherein the end caps 11 are configured to function at least partially as a carrier of the stator windings 20.

[0250] Item 3: Stator 2 according to item 2, wherein each end cap 1 1 a...1 1 n comprises a wire guide area with wire guide grooves 15a...15n.

[0251] Item 4: Stator 2 according to item 2 or 3, wherein each end cap 11 comprises an essentially straight end section with at least one guide groove 15 in a radially outer side 17 of the stator pole 10 and a curved end section with at least one wire groove 15 in a radially inner side 16 of the stator pole 10.

[0252] Item 5: Stator 2 according to any of the preceding items, wherein a number of layers of the stator windings 20 varies at least partially about at least some of the stator poles 10 in radial direction of the stator 2.

[0253] Item 6: Stator 2 according to item 5, characterized in that a number of wire windings

[0254] 21 on the radial outer side 17 of the stator pole 10 is greater than on the radial inner side 16 of the stator pole 10.

[0255] Item 7: Stator 2 according to any of the preceding items, characterized in that the stator poles 10 are connected by means of electrically conductive stator plate elements 13 in order to form a stator plate 110. Item 8: Stator 2 according to item 7, wherein the stator pole 10 is built as a compound of a plastic element with stator plate elements 13 formed as electrically conductive inlay elements being inserted in recesses 12 of the plastic element in axial direction of the stator 2.

[0256] Item 9: Stator 2 according to item 8, wherein the electrically conductive inlay elements are arranged on the inner radial side 16 and on the outer radial side 17 of the stator pole 10.

[0257] Item 10: Stator 2 according to one of the preceding items, characterized in that the conductive carrier element 30 comprises plated-through holes 31 , wherein a metal layer of each plated-through hole 31 is electrically connected to an electrically conductive connection element 14.

[0258] Item 11 : Stator 2 according to item 10, characterized in that the connection element 14 is a conductor track section on an upper side 34 of the conductive carrier element 30, with an end region of a winding wire 21 connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0259] Item 12: Stator 2 according to item 10, wherein the connection element 14 is a pressin part pressed into the conductive carrier 30, with an end region of a winding wire 21 connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the conductive carrier element 30, in particular with the winding wire 21 in a notch arranged in the press-in part or groove is inserted and is welded or soldered.

[0260] Item 13: Stator 2 according to item 10, wherein the connection element 14 is a wirecatching part pressed into the conductive carrier element 30, the winding wire 21 being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire 21 being welded, in particular contact welded, to the wire-catching part. Item 14: Stator 2 according to any of the preceding items, wherein the conductive carrier element 30 is at least one of: printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire, and carbon nanotube network.

[0261] Item 15: Stator 2 according to any of the preceding items, wherein potting compound is arranged at least in sections between the end cap 1 1 and the stator winding 20.

[0262] Item 16: Stator 2 according to any of the preceding items, wherein the stator 2 is configured to be used for an electric machine formed as: electric motor 1 , electric generator.

[0263] Item 17: Stator 2 according to any of the preceding items, wherein the grouped arrangement is ring-shaped or in a line.

[0264] Item 18: Electric motor 1 with a stator 2 according to one of the aforementioned items, with a rotor rotatably arranged within the stator 2.

[0265] Item 19: Method for manufacturing a stator 2 of an electric machine, comprising the steps:

[0266] - providing stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10;

[0267] - providing a set of the stator poles 10 in a grouped arrangement;

[0268] - connecting the stator poles 10 by means of an electrically conductive stator plate 1 10;

[0269] - arranging stator windings 20 on the stator poles 10, wherein ends of winding wires 21 of units of three consecutive stator poles 10 each are electrically conductively interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way that a polarity changes from one stator pole 10 to the next stator pole 10. Item 20: Method according to item 19, wherein the ends of the windings 20 of the stator poles 10 are soldered or welded to the conductive carrier element 30.

[0270] Item 21 : Method according to item 19 or 20, wherein the stator plate 1 10 is built as stator plate elements 13 in recesses 12 of the stator poles 10.

[0271] The second itemized list refers to the variation of layers of the stator windings. The items of the second itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0272] Second itemized list:

[0273] Item 22: Stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of said stator poles 10 are configured such that a polarity alternates from one stator pole 10 to the next stator pole 10, wherein stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of a conductive carrier element 30, wherein a number of layers of the stator windings 20 varies at least partially about at least some of the stator poles 10 in radial direction of the stator 2.

[0274] Item 23: Stator 2 according to item 22, characterized in that a number of wire windings 21 on the radial outer side 17 of the stator pole 10 is greater than on the radial inner side 16 of the stator pole 10.

[0275] Item 24: Stator 2 according to item 22 or 23, characterized in that each stator pole 10 comprises an end cap 11 on each axial end section 18, 19, wherein the end caps 11 are configured to function at least partially as a carrier of the stator windings 20.

[0276] Item 25: Stator 2 according to item 24, wherein each end cap 11 comprises a wire guide area with wire guide grooves 15. Item 26: Stator 2 according to any of items 22 to 25, characterized in that the stator poles 10 are connected by means of electrically conductive stator plate elements 13 in order to form a stator plate 110.

[0277] Item 27: Stator 2 according to item 26, wherein the stator pole 10 is built as a compound of a plastic element with stator plate elements 13 formed as electrically conductive inlay elements being inserted in recesses 12 of the plastic element in axial direction of the stator 2.

[0278] Item 28: Stator 2 according to item 27, wherein the electrically conductive inlay elements are arranged on the inner radial side 16 and on the outer radial side 17 of the stator pole 10.

[0279] Item 29: Stator 2 according to one of items 22 to 28, characterized in that the conductive carrier element 30 comprises plated-through holes 31 , wherein a metal layer of each plated-through hole 31 is electrically connected to an electrically conductive connection element 14.

[0280] Item 30: Stator 2 according to item 29, characterized in that the connection element 14 is a conductor track section on an upper side 34 of the conductive carrier element 30, with an end region of a winding wire 21 connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0281] Item 31 : Stator 2 according to item 29, wherein the connection element 14 is a pressin part pressed into the conductive carrier 30, with an end region of a winding wire 21 connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the conductive carrier element 30, in particular with the winding wire 21 in a notch arranged in the press-in part or groove is inserted and is welded or soldered.

[0282] Item 32: Stator 2 according to item 29, wherein the connection element 14 is a wirecatching part pressed into the conductive carrier element 30, the winding wire 21 being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire 21 being welded, in particular contact welded, to the wire-catching part. Item 33: Stator 2 according to any of items 22 to 32, wherein the conductive carrier element 30 is at least one of: printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire, and carbon nanotube network.

[0283] Item 34: Stator 2 according to any of items 22 to 33, wherein potting compound is arranged at least in sections between the end cap 1 1 and the stator winding 20.

[0284] Item 35: Stator 2 according to any of items 22 to 34, wherein the stator 2 is configured to be used for an electric machine formed as: electric motor, electric generator.

[0285] Item 36: Stator 2 according to any of items 22 to 35, wherein the grouped arrangement is ring-shaped or in a line.

[0286] Item 37: Electric motor 1 with a stator 2 according to one of items 22 to 36, with a rotor rotatably arranged within the stator 2.

[0287] Item 38: Method for manufacturing a stator 2 of an electric machine, comprising the steps:

[0288] - providing stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10;

[0289] - providing a set of the stator poles 10 in a grouped arrangement;

[0290] - connecting the stator poles 10 by means of an electrically conductive stator plate 1 10;

[0291] - arranging stator windings 20 on the stator poles 10, wherein ends of winding wires 21 of units of three consecutive stator poles 10 each are electrically conductively interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way that a polarity changes from one stator pole 10 to the next stator pole 10,

[0292] - wherein layers of the stator windings 20 are arranged on the stator pole such that a number varies at least partially about at least some of the stator poles 10 in radial direction of the stator 2. Item 39: Method according to item 38, wherein the ends of the windings 20 of the stator poles 10 are soldered or welded to the conductive carrier element 30.

[0293] Item 40: Method according to item 38 or 39, wherein the stator plate 1 10 is built as stator plate elements 13 in recesses 12 of the stator poles 10.

[0294] The third itemized list refers to an end cap on each axial end section of each stator pole. The items of the third itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0295] Third itemized list:

[0296] Item 41 : Stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of said stator poles 10 are configured such that a polarity alternates from one stator pole 10 to the next stator pole 10, wherein stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of a conductive carrier element 30, wherein each stator pole 10 comprises an end cap 1 1 on each axial end section 18, 19, wherein the end caps 11 are configured to function at least partially as a carrier of the stator windings 20.

[0297] Item 42: Stator 2 according to item 41 , wherein each end cap 11 comprises a wire guide area with wire guide grooves 15.

[0298] Item 43: Stator 2 according to item 41 or 42, wherein each end cap 11 comprises an essentially straight end section with at least one guide groove 15 in a radially outer side 17 of the stator pole 10 and a curved end section with at least one wire groove 15 in a radially inner side 16 of the stator pole 10.

[0299] Item 44: Stator 2 according to any of items 41 to 43, wherein a number of layers of the stator windings 20 varies at least partially about at least some of the stator poles 10 in radial direction of the stator 2. Item 45: Stator 2 according to item 44, characterized in that a number of wire windings 21 on the radial outer side 17 of the stator pole 10 is greater than on the radial inner side 16 of the stator pole 10.

[0300] Item 46: Stator 2 according to any of items 41 to 45, characterized in that the stator poles 10 are connected by means of electrically conductive stator plate elements 13 in order to form a stator plate 110.

[0301] Item 47: Stator 2 according to item 46, wherein the stator pole 10 is built as a compound of a plastic element with stator plate elements 13 formed as electrically conductive inlay elements being inserted in recesses 12 of the plastic element in axial direction of the stator 2.

[0302] Item 48: Stator 2 according to item 47, wherein the electrically conductive inlay elements are arranged on the inner radial side 16 and on the outer radial side 17 of the stator pole 10.

[0303] Item 49: Stator 2 according to one of items 41 to 48, characterized in that the conductive carrier element 30 comprises plated-through holes 31 , wherein a metal layer of each plated-through hole 31 is electrically connected to an electrically conductive connection element 14.

[0304] Item 50: Stator 2 according to item 49, characterized in that the connection element 14a...14n is a conductor track section on an upper side 34 of the conductive carrier element 30, with an end region of a winding wire 21 connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0305] Item 51 : Stator 2 according to item 49, wherein the connection element 14a...14n is a press-in part pressed into the conductive carrier 30, with an end region of a winding wire 21 connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the conductive carrier element 30, in particular with the winding wire 21 in a notch arranged in the press-in part or groove is inserted and is welded or soldered. Item 52: Stator 2 according to item 49, wherein the connection element 14a...14n is a wire-catching part pressed into the conductive carrier element 30, the winding wire 21 being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire 21 being welded, in particular contact welded, to the wire-catching part.

[0306] Item 53: Stator 2 according to any of items 41 to 52, wherein the conductive carrier element 30 is at least one of: printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire, and carbon nanotube network.

[0307] Item 54: Stator 2 according to any of items 41 to 53, wherein potting compound is arranged at least in sections between the end cap 1 1 and the stator winding 20.

[0308] Item 55: Stator 2 according to any of items 41 to 54, wherein the stator 2 is configured to be used for an electric machine formed as: electric motor 1 , electric generator.

[0309] Item 56: Stator 2 according to any of items 41 to 55, wherein the grouped arrangement is ring-shaped or in a line.

[0310] Item 57: Electric motor 1 with a stator 2 according to one of items 41 to 56, with a rotor rotatably arranged within the stator 2.

[0311] Item 58: Method for manufacturing a stator 2 of an electric machine, comprising the steps:

[0312] - providing stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10, wherein each stator pole 10 comprises an end cap on each axial end section, wherein the end caps 11 are configured to function at least partially as a carrier of the stator windings 20;

[0313] - providing a set of the stator poles 10 in a grouped arrangement;

[0314] - connecting the stator poles 10 by means of an electrically conductive stator plate 1 10. Item 59: Method according to item 58, wherein the ends of the windings 20 of the stator poles 10 are soldered or welded to the conductive carrier element 30.

[0315] Item 60: Method according to item 58 or 59, wherein the stator plate 1 10 is built as stator plate elements 13 in recesses 12 of the stator poles 10.

[0316] The fourth itemized list refers to stator plate elements. The items of the fourth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0317] Fourth itemized list:

[0318] Item 61 : Stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of said stator poles 10 are configured such that a polarity alternates from one stator pole 10 to the next stator pole 10, wherein stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of a conductive carrier element 30, wherein the stator poles 10 are connected by means of electrically conductive stator plate elements 13 in order to form a stator plate 110.

[0319] Item 62: Stator 2 according to item 61 , characterized in that each stator pole 10 comprises an end cap 1 1 on each axial end section 18, 19, wherein the end caps 11 are configured to function at least partially as a carrier of the stator windings 20.

[0320] Item 63: Stator 2 according to item 62, wherein each end cap 11 comprises a wire guide area with wire guide grooves 15.

[0321] Item 64: Stator 2 according to item 63, wherein each end cap 1 1 comprises an essentially straight end section with at least one guide groove 15 in a radially outer side 17 of the stator pole 10 and a curved end section with at least one wire groove 15 in a radially inner side 16 of the stator pole 10. Item 65: Stator 2 according to any of the items 61 to 64, wherein a number of layers of the stator windings 20 varies at least partially about at least some of the stator poles 10 in radial direction of the stator 2.

[0322] Item 66: Stator 2 according to item 65, characterized in that a number of wire windings 21 on the radial outer side 17 of the stator pole 10 is greater than on the radial inner side 16 of the stator pole 10.

[0323] Item 67: Stator 2 according to item 67, wherein the stator pole 10 is built as a compound of a plastic element with stator plate elements 13 formed as electrically conductive inlay elements being inserted in recesses 12 of the plastic element in axial direction of the stator 2.

[0324] Item 68: Stator 2 according to item 67, wherein the electrically conductive inlay elements are arranged on the inner radial side 16 and on the outer radial side 17 of the stator pole 10.

[0325] Item 69: Stator 2 according to one of the items 61 to 68, characterized in that the conductive carrier element 30 comprises plated-through holes 31 , wherein a metal layer of each plated-through hole 31 is electrically connected to an electrically conductive connection element 14.

[0326] Item 70: Stator 2 according to item 69, characterized in that the connection element 14 is a conductor track section on an upper side 34 of the conductive carrier element 30, with an end region of a winding wire 21 connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

[0327] Item 71 : Stator 2 according to item 69, wherein the connection element 14 is a pressin part pressed into the conductive carrier 30, with an end region of a winding wire 21 connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the conductive carrier element 30, in particular with the winding wire 21 in a notch arranged in the press-in part or groove, inserted and welded or soldered. Item 72: Stator 2 according to item 69, wherein the connection element 14 is a wirecatching part pressed into the conductive carrier element 30, the winding wire 21 being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire 21 being welded, in particular contact welded, to the wire-catching part.

[0328] Item 73: Stator 2 according to any of the items 61 to 72, wherein the conductive carrier element 30 is at least one of: printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire, and carbon nanotube network.

[0329] Item 74: Stator 2 according to any of the items 61 to 73, wherein potting compound is arranged at least in sections between the end cap 1 1 and the stator winding 20.

[0330] Item 75: Stator 2 according to any of the items 61 to 74, wherein the stator 2 is configured to be used for an electric machine formed as: electric motor 1 , electric generator.

[0331] Item 76: Stator 2 according to any of the items 61 to 75, wherein the grouped arrangement is ring-shaped or in a line.

[0332] Item 77: Electric motor 1 with a stator 2 according to one of the items 61 to 76, with a rotor rotatably arranged within the stator 2.

[0333] Item 78: Method for manufacturing a stator 2 of an electric machine, comprising the steps:

[0334] - providing stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10;

[0335] - providing a set of the stator poles 10 in a grouped arrangement;

[0336] - connecting the stator poles 10 by means of an electrically conductive stator plate 1 10;

[0337] - arranging stator windings 20 on the stator poles 10, wherein ends of winding wires 21 of units of three consecutive stator poles 10 each are electrically conductively interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way that a polarity changes from one stator pole 10 to the next stator pole 10.

[0338] Item 79: Method according to item 78, wherein the ends of the windings 20 of the stator poles 10 are soldered or welded to the conductive carrier element 30.

[0339] Item 80: Method according to item 78 or 79, wherein the stator plate 1 10 is built as stator plate elements 13 in recesses 12 of the stator poles 10.

[0340] The fifth itemized list refers to the polarity of the stator windings. The items of the fifth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0341] Fifth itemized list:

[0342] Item 81 : Stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of said stator poles 10 are such configured, that a polarity of a magnetic field is alternating from one stator pole 10 to the next stator pole 10, wherein stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of a conductive carrier element 30, wherein the conductor tracks 32 of the conductive carrier element 30 are configured in such a way that they connect stator windings 20 of all stator poles 10 to one another, wherein groups of three adjacent stator poles 10 are connected so that the polarity of a magnetic field during operation of the electric machine with the stator 2 alternates from one stator pole 10 to the next stator pole 10.

[0343] Item 82: Method for manufacturing a stator 2 of an electric machine, comprising the steps:

[0344] - providing stator poles 10 with end caps 11 on each axial end section 18, 19 of the stator poles 10;

[0345] - providing a set of the stator poles 10 in a grouped arrangement;

[0346] - connecting the stator poles 10 by means of an electrically conductive stator plate 1 10; - arranging stator windings 20 on the stator poles 10, wherein ends of winding wires 21 of units of three consecutive stator poles 10 each are electrically conductively interconnected by means of conductor tracks 32 of a conductive carrier element 30 in such a way that a polarity changes from one stator pole 10 to the next stator pole 10,

[0347] - wherein the conductor tracks 32 of the conductive carrier element 30 are configured in such a way that they connect stator windings 20 of all stator poles 10 to one another,

[0348] - wherein groups of three adjacent stator poles 10 are connected so that the polarity of a magnetic field during operation of the electric machine with the stator 2 alternates from one stator pole 10 to the next stator pole 10.

[0349] The sixth itemized list refers to the connection of the stator poles to the three phases A,

[0350] B, and C. The items of the sixth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0351] Sixth itemized list:

[0352] Item 83: A stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of the stator poles 10 are such configured, that a polarity of a magnetic field is alternating from one stator pole 10 to the next stator pole 10, wherein the stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of conductive carrier element 30, wherein a first unit of stator poles 10 is connected to phase A, a second unit to phase B, and a third unit to phase C, the phases A, B, and C are arranged according to a multiphase power supply.

[0353] Item 84: The stator 2 according to item 83, wherein the stator comprises eighteen stator poles 10 and two units of stator poles 10 are assigned to each of phases A, B, and

[0354] C. Item 85: The stator 2 according to item 83 or item 84, wherein the stator 2 includes a control board 320 that is coupled to the stator poles 10, wherein the control board 320 is configured to apply the phases A, B, and C to the respective units of the stator poles 10.

[0355] Item 86: The stator 2 according to any of the preceding items 83 - 85, wherein the conductive carrier element 30 is at least one of: printed circuit board, point-to-point construction, wire wrap, breadboard, flexible circuit, molded interconnect device, nanowire and carbon nanotube network.

[0356] The seventh itemized list refers to a multi layer interconnecting board. The items of the seventh itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims and any other embodiments described in the application.

[0357] Seventh itemized list:

[0358] Item 87: A stator 2 for an electric machine, comprising several stator poles 10 being assembled in a grouped arrangement, wherein stator windings 20 of the stator poles 10 are such configured, that a polarity of a magnetic field is alternating from one stator pole 10 to the next stator pole 10, wherein the stator windings 20 of units of three consecutive stator poles 10 each are interconnected by means of conductor tracks 32 of conductive carrier element 30, wherein conductive carrier element 30, is a printed circuit board comprising at least 6 layers.

[0359] Item 88: The stator 2 according to item 87, wherein the stator 1 comprises a motor control board 320 being a printed circuit board having at least 6 layers. LIST OF REFERENCE NUMERALS

[0360] 1 electric motor

[0361] 2 stator

[0362] 10 stator pole

[0363] 1 1 end cap

[0364] 12 recess

[0365] 13 stator plate element

[0366] 14 electrically conductive connection element

[0367] 15 wire grooves

[0368] 16 inner radial side

[0369] 17 outer radial side

[0370] 18 top side axial end section

[0371] 19 bottom side axial end section

[0372] 20 stator windings or coils

[0373] 21 winding wire

[0374] 22 first end of winding wire

[0375] 23 second end of winding wire

[0376] 30 conductive carrier element

[0377] 31 plated through hole

[0378] 32 conductor tracks

[0379] 33 V-shaped slots

[0380] 34 upper side

[0381] 40 connections

[0382] 41 holes for connections

[0383] 50 mounting holes

[0384] 1 10 stator plate

[0385] 200 method step

[0386] 210 method step

[0387] 220 method step

[0388] 230 method step

[0389] 300 interconnection board (ICB)

[0390] 320 control board

Claims

CLAIMS1. A stator (2) for an electric machine, comprising several stator poles (10) being assembled in a ring-shaped arrangement defining a stator axis, an interconnection board (300) and a control board (320) being coupled to the stator poles (10);- wherein stator windings (20) of the stator poles (10) are such configured, that a polarity of a magnetic field is alternating from one stator pole (10) to the next stator pole (10), wherein the stator windings (20) of units of three consecutive stator poles (10) each are interconnected by means of conductor tracks (32) of the interconnection board (300),- wherein the interconnection board (300) and the control board (320) are arranged on the same axial level with respect to the stator axis.

2. The stator (2) according to claim 1 , wherein the interconnection board (300) and the control board (320) are integrated on a single, unified printed circuit board.

3. The stator (2) according to claim 2, wherein the unified printed circuit board comprises a plurality of layers.

4. The stator (2) according to claim 3, wherein the unified printed circuit board comprises at least six layers.

5. The stator (2) according to any of the claims 2 - 4, wherein the part of the unified printed circuit board assigned to the interconnection board (300) comprises conductor tracks (32) in more layers than the part assigned to the control board (320).

6. The stator (2) according to any of the claims 2 - 5, wherein the unified printed circuit board forms a ring-shaped disc, with the part of the unified printed circuit board assigned to the interconnection board (300) positioned radially outward and the part assigned to the control board (320) positioned radially inward with respect to the stator (100) axis.

7. The stator (2) according to claim 1 , wherein the interconnection board (300) and the control board (320) both form a ring-shaped disc and are separate printed circuit boards, wherein the interconnection board (300) is positioned radially outward and the control board (320) positioned radially inward with respect to the stator (100) axis.

8. The stator (2) according to claim 7, wherein the interconnection board (300) comprises more layers than the control board (320).

9. The stator (2) according to any of the preceding claims, wherein the interconnection board (300) and the control board (320) are located on an end face of the ring-shaped arrangement of the stator poles (10).

10. The stator (2) according to any of the preceding claims, wherein each stator pole (10) comprises an end cap (11 ) on each axial end section (18, 19), wherein the end caps (1 1 ) are configured to function at least partially as a carrier of the stator windings (20).1 1 .The stator (2) according to claim 10, wherein each end cap (11 ) comprises a wire guide area with wire guide grooves (15).

12. The stator (2) according to claim 1 1 , wherein each end cap (1 1 ) comprises an essentially straight end section with at least one guide groove (15) in a radially outer side (17) of the stator pole (10) and a curved end section with at least one wire groove (15) in a radially inner side (16) of the stator pole (10).

13. The stator (2) according to any of the preceding claims, wherein a first unit of stator poles (10) is connected to phase A, a second unit to phase B, and a third unit to phase C, the phases A, B, and C are arranged according to a multiphase power supply.

14. The stator (2) according to claim 13, wherein the stator (2) comprises 18 stator poles and two units of stator poles (10) are assigned to each of phases A, B, and C.

15. The stator (2) according to any of the preceding claims 13 and 14, wherein the control board (320) is configured to apply the phases A, B, and C to the respective units of the stator poles (10).

16. The stator (2) according to any of the preceding claims, wherein a number of layers of the stator windings (20) varies at least partially about at least some of the stator poles (10) in radial direction of the stator (2).

17. The stator (2) according to claim 16, wherein a number of wire windings (21 ) on the radial outer side (17) of the stator pole (10) is greater than on the radial inner side (16) of the stator pole (10).18.The stator (2) according to any of the preceding claims, wherein the stator poles (10) are connected by means of electrically conductive stator plate elements (13) in order to form a stator plate (1 10).

19. The stator (2) according to any of the preceding claims, wherein the stator pole (10) is built as a compound of a plastic element with stator plate elements (13) formed as electrically conductive inlay elements being inserted in recesses (12) of the plastic element in axial direction of the stator (2).

20. The stator (2) according to claim 19, wherein the electrically conductive inlay elements are arranged on the inner radial side (16) and on the outer radial side (17) of the stator pole (10).

21. The stator (2) according to any of the preceding claims, wherein the interconnection board (300) comprises plated-through holes (31 ), wherein a metal layer of each plated-through hole (31 ) is electrically connected to an electrically conductive connection element (14).

22. The stator (2) according to claim 21 , wherein the plated-through hole may comprise a snapping mechanism which allows stator poles to clip directly into the interconnection board (300) without soldering.

23. The stator (2) according to claim 21 , wherein the connection element (14) comprises a conductor track section on an upper side (34) of the interconnection board (300), with an end region of a winding wire (21 ) connected to a contacting point being materially connected to the conductor track section, in particular welded or soldered.

24. The stator (2) according to claim 21 , wherein the connection element (14) comprises a press-in part pressed into the interconnection board (300), with an end region of a winding wire (21) connected to the contact point being materially connected to the press-in part, in particular on the side facing away from the interconnection board (300), in particular with the winding wire (21 ) in a notch arranged in the press-in part or groove is inserted and is welded or soldered.

25. The stator (2) according to any of claims 21 , wherein the connection element (14) comprises a wire-catching part pressed into the interconnection board (300), the winding wire (21 ) being held between two legs of a V-shaped catching section of the wire-catching part, the winding wire (21 ) being welded, in particular contact welded, to the wire-catching part.26.The stator (2) according to any of the preceding claims 10 - 12, wherein potting compound is arranged at least in sections between the end cap (11 ) and the stator winding (20).27.The stator (2) according to any of the preceding claims, wherein the stator (12) is configured to be used for an electric machine formed as: electric motor (1 ), electric generator.

28. An electric motor (1 ) with a stator (2) according to any of the preceding claims, with a rotor rotatably arranged within the stator (2), wherein the control board (320) is a motor control board.

29. A Method for manufacturing a stator (2) of an electric machine, comprising the steps:- providing stator poles (10) with end caps (11 ) on each axial end section (18, 19) of the stator poles (10);- providing a set of the stator poles (10) in a ring-shaped arrangement defining a stator axis;- connecting the stator poles (10) by means of an electrically conductive stator plate (1 10),- arranging stator windings (20) on the stator poles (10), wherein ends of winding wires (21 ) of units of consecutive three stator poles (10) each are electrically conductive interconnected by means of conductor tracks (32) of an interconnection board (300) in such a way, that a polarity changes from one stator pole (10) to the next stator pole (10)- coupling a control board (320) to the stator poles (10) and arranging the interconnection board (300) and the control board (320) on the same axial level with respect to the stator axis.

30. The method according to claim 29, wherein the ends of the windings (20) of the stator poles (10) are soldered or welded to the interconnection board (300).31 .The method according to claim 29 or 30, wherein the stator plate (1 10) is built as stator plate elements (13) in recesses (12) of the stator poles (10).

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