Stator for a radial flux birotor machine, method for producing a stator for a radial flux birotor machine, radial flux birotor machine and method for producing a radial flux birotor machine

Abstract

The invention relates to a stator for a radial flux birotor machine, in particular for a hub motor, comprising: a stator core; a winding placed in the stator core, the winding being designed to be self-supporting for torque support of the stator and having an insulation with respect to the stator core, the winding protruding beyond the stator core at at least one axial end; a mechanical connection arrangement associated with the stator core wherein the connection arrangement has at least one further electrical insulation formed at least partially. The invention further relates to a radial flux birotor machine having such a stator, and to a method for producing a stator and to a method for producing a radial flux birotor machine.

Description

Stator for a radial flux dual-rotor machine, method for producing a stator for a radial flux dual-rotor machine, radial flux dual-rotor machine, and method for producing a radial flux dual-rotor machine. Technical Field

[0001] The present invention relates to a stator for a radial flux dual rotor machine, particularly for a hub motor, a method for producing a stator for a radial flux dual rotor machine, a corresponding radial flux dual rotor machine, particularly for a hub drive, and a method for producing a radial flux dual rotor machine, particularly for a hub drive. Background Technology

[0002] Compared to conventional motors with only one rotor, motors with one stator and two rotors connected to each other in a rotating-fixed manner—so-called dual-rotor machines (also known as multi-rotor, double-rotor, etc.)—can increase both the torque density and efficiency of the electric drive. This is due, particularly in so-called "yokeless" designs, the absence of a magnetic return path in the stator, thus significantly reducing core losses. Additionally, the two rotors typically provide more space for field-excitation magnets (in permanent magnet synchronous machines (PSMs)) or conductor materials (in induction machines (IMs) or electrically excited synchronous machines (ESMs). Depending on the orientation of the magnetic field lines in the air gap, such machines can be divided into two groups: those carrying magnetic flux axially (field lines parallel to the axis of rotation, so-called axial flux machines) and those carrying magnetic flux radially (field lines in the radial direction in the air gap, so-called radial flux machines).

[0003] For example, radial flux twin-rotor machines are described in DE 10 2021 003 942 A1. Radial flux twin-rotor machines are characterized by high torque and high power density. These machines typically employ established manufacturing methods suitable for the mass production of windings and laminated cores, enabling the torque generated in the stator core to be supported. In known radial flux twin-rotor machines, all conductive machine parts are grounded with low impedance and connected to each other. Therefore, these parts have low resistance and are protected from electrical interference. In particular, this includes the stator stack, which is connected to the machine housing via form fit, friction fit, or mechanical connection, which also contributes to electrical grounding. The stator core windings are electrically insulated from most other machine parts to carry high voltages (hundreds / kilovolts). This insulation has high resistance (greater than kiloohms) relative to other machine parts. A radial flux twin-rotor machine has two potentials in its resting state, one for the windings and the other for the remaining mechanical components, such as the housing and cooling system.

[0004] During operation, the capacitance between the connector and ground continuously charges and discharges between a positive high voltage (HV+) and a negative high voltage (HV-). This charging and discharging generates a common-mode voltage. Charging and discharging result in heat loss and may also generate electromagnetic emissions, which can interfere with other electrical equipment. Summary of the Invention

[0005] In this context, the object of the present invention is to provide an improved stator for a radial flux dual rotor machine, an improved radial flux dual rotor machine, and an improved method for producing the stator and the radial flux dual rotor machine for the radial flux dual rotor machine, which reduce the capacitance between phase and ground.

[0006] According to the invention, this objective is achieved by a stator having the features of claim 1 and / or by a method for producing a stator having the features of claim 14 and / or by a radial flux twin-rotor machine having the features of claim 21 and / or by a method for producing a radial flux twin-rotor machine having the features of claim 28.

[0007] Accordingly, the following is provided: - A stator for a radial flux dual-rotor machine, particularly for a hub motor, the stator having: a stator core; a winding disposed in the stator core, the winding being designed to be self-supporting for torque support of the stator, wherein the winding protrudes beyond the stator core at at least one axial end; and a mechanical connection arrangement associated with the stator core, wherein the connection arrangement has at least one additional insulation formed at least partially.

[0008] - A method for producing a stator for a radial flux dual-rotor machine, particularly a stator according to the invention, comprising the steps of: providing a stator core having corresponding radial outer stator slots and corresponding radial inner stator slots; inserting respective conductor bars through the inner and outer stator slots; connecting the conductor bars inserted into the inner and outer stator slots at their ends to form a winding having conductor loops, the winding being designed to be self-supporting for torque support of the stator; providing a connection arrangement; and providing at least one additional electrical insulation, at least partially formed, between the stator core and the connection arrangement.

[0009] - A radial flux dual-rotor machine, particularly a radial flux dual-rotor machine for a hub drive, comprising: a mechanically fixed base; a stator according to the invention, wherein a support device for torque support is shaped-fitted with at least one axial end of a winding and supported on the base; a first rotor radially arranged inside the stator core; a second rotor radially arranged outside the stator core; and at least one additional electrical insulation, which is at least partially disposed between the base and / or the connection arrangement.

[0010] - A method for producing a radial flux twin-rotor machine, particularly a radial flux twin-rotor machine according to the invention, the method comprising the steps of: providing a mechanically fixable base; providing a stator according to the invention, the stator having a connection arrangement associated with a stator core; providing at least one additional electrical insulation, at least partially formed, between the base and the connection arrangement and / or the stator core; and attaching the connection arrangement to the base.

[0011] The principle upon which this invention is based is that electrical insulation between the windings and the stator and / or radial flux twin-rotor machine components directly or indirectly connected to the windings causes a reduction in capacitance. The capacitance between the windings and the stator core is specifically determined by the area and distance between these components. Larger areas and smaller distances increase capacitance. This capacitance is a major component of the capacitive effect in electric motors. The capacitance in electric motors, particularly the capacitance between the windings and the grounded stator core, significantly impacts operation. It generates losses and electromagnetic radiation, negatively affecting motor efficiency and potentially interfering with other devices. Due to the winding arrangement, the design of radial flux twin-rotor machines with large contact areas between the windings and the stator core generates capacitances up to three to four times greater than conventional electric motors. A suitable arrangement of insulation in an electric motor reduces capacitance by increasing the distance between conductive components and, for example, using materials with low dielectric constants. This reduction in capacitance results in lower motor losses, less electromagnetic radiation, and improved electrical safety and reliability.

[0012] The concept upon which this invention is based relates to the use of a self-supporting design of the windings according to the invention and the connection arrangement associated with the stator, so as to provide effective electrical insulation in the stator and / or radial flux dual-rotor machine in a simple and efficient manner, thereby reducing capacitance.

[0013] The self-supporting design of the windings means that the windings have sufficient stiffness and strength to support the drive torque against torsion around the machine axis. The self-supporting windings are specifically embedded within the soft magnetic stator core used for flux guidance. The specific advantage of this is that the stator core itself does not require any inherent torsional stiffness relative to the machine axis, nor does it require any other auxiliary structures to secure the stator core. Instead, the torque is supported, and in particular, fully supported, via the windings.

[0014] In the field of radial flux twin-rotor machines, this is achieved by giving the windings load-bearing capabilities to support torque in addition to conducting current, and by mechanically fixing the windings to the outside of the stator core at one axial end. Therefore, the interference fit between the stator and stator housing, which is often used in conventional electric machines for torque support and makes electrical insulation difficult or even impossible, is unnecessary, making electrical insulation easier to implement.

[0015] To manufacture such a winding, for example, the winding can be produced integrally within an existing stator core. The individual bars of the winding are inserted axially through stator slots in the stator core, particularly through radially inward and radially outward stator slots, and joined at the conductor ends. Here, a material-locking connection is preferably provided by fusion or welding. Thus, the winding is form-fitted to the stator core.

[0016] In some embodiments, the stator slots may have helices, wherein the pitch angle (also known as the torsion angle) of the stator slots or the helices described therewith ensures the formation of conductor loops by means of connecting inserted conductor bars. The angles at which the conductor loops sweep relative to the central axis of the machine respectively surround the magnetic poles of the rotor. In this way, despite functional integration, the stator can be manufactured very easily, requiring very few parts and relatively simple conventional connection techniques, and therefore very few manufacturing steps.

[0017] Stator designed in this way can now be accomplished using various inner and outer rotors known to those skilled in the art to form an electric machine according to the invention. This includes, for example, permanent magnet rotors, squirrel-cage rotors, or electrically excited rotors with surface-mounted and / or embedded magnets. Hybrid variants with different rotor types in the inner and outer rotors can also be provided. One possible embodiment provides a rotor made of a soft magnetic solid material and having surface-mounted permanent magnets. The low harmonic content of the winding variant described herein, along with the distance between the solid material and the air gap ensured by the magnets, prevents unacceptably large losses due to eddy currents in the rotor. In this embodiment, relatively high efficiency can then be advantageously achieved, and the rotor can still be manufactured in a very cost-effective manner.

[0018] To produce a radial flux twin-rotor machine, the connecting arrangement or support device, and thus the stator, can be securely connected to the base, which is the fixed part of the electric machine, by a suitable method. One possible embodiment provides a recess (e.g., a through hole) for press-fit fasteners (e.g., screws). However, form-fitting connections and / or material-locking connections are, of course, alternatively or additionally conceivable.

[0019] In particular, the present invention is particularly advantageous for use in hub motors, especially for motor vehicles. Due to the design according to the invention, the mass of the radial flux dual-rotor machine can be reduced and the torque density can be increased due to functional integration, which advantageously means a reduction in unsprung mass, particularly in hub motors. Furthermore, according to the invention, a relatively short axial length can be achieved with a relatively large diameter, which is advantageous in terms of torque support and mounting space, especially inside the wheel. Moreover, with the invention, when the radial flux dual-rotor machine is operated by creating multiple insulating barriers, the capacitance between the phase connection and ground can be reduced, and losses and electromagnetic radiation can be reduced, thereby achieving the benefit of increased efficiency.

[0020] Advantageous embodiments and further developments are derived from the additional dependent claims and the description with reference to the accompanying drawings.

[0021] According to one embodiment, the connection arrangement is formed as a support device for engaging with the winding shape at at least one axial end for torque support, and the connection arrangement has at least one additional point of insulation. When the support device is provided, electrical insulation can be easily provided via the support device by designing it to be partially or completely electrically insulated.

[0022] According to one embodiment, the support device has a radially inner support element for engaging with a conductor rod and a radially outer support element for engaging with a conductor rod, wherein the inner support element and / or the outer support element each have at least one additional insulation, or both support elements have at least one additional insulation.

[0023] According to one embodiment, the connection arrangement is designed as part of the electric machine, particularly a wheel bracket or fork, and is configured for direct or indirect connection to the stator core. The at least one additional insulation is designed such that it exists in one or more mechanical connections between the stator and the electric machine, thus insulating the stator and the electric machine via the connection arrangement.

[0024] According to one embodiment, the at least one additional insulation is designed as an insulating layer disposed between the stator core and the connection arrangement. As a result, insulation can be easily applied while simultaneously ensuring effective insulation.

[0025] According to one embodiment, the insulating layer can be formed of insulating paper or insulating film. Embodiments of the stator according to the invention, having a self-supporting winding capable of arranging the insulating layer, have proven advantageous. The generation of effective electrical insulation is simplified by arranging conventional insulating paper or insulating film known to those skilled in the art.

[0026] According to one embodiment, the additional insulation at least once is designed as an insulating coating applied to the stator core and / or the connection arrangement. As a result, not only is the capacitance between the stator support portions reduced, but also the dominant capacitance between the stator core and the stator windings is reduced, which decreases electrostatic losses and electromagnetic radiation.

[0027] According to one embodiment, the insulating coating can be formed by anodizing the stator core and / or connection arrangements or by coating the stator core and / or connection arrangements with a plastic material. When producing the insulating coating, in conventionally known anodizing processes, the uppermost material layer of the stator core, made of aluminum or aluminum alloy, is converted into a non-conductive layer providing electrical insulation. When the stator core is formed of a material that does not allow anodizing, electrical insulation is achieved by coating with a suitable plastic material. The plastic coating used for insulation in an electric motor must meet several requirements: it must be electrically insulating, thermally stable, mechanically robust, and resistant to chemical effects. The plastic coating can be applied in a coating process. The invention can relate to, for example, dip coating (where a component is immersed in liquid plastic and then dried or hardened), powder coating (where powdered plastic is electrostatically applied to the component and then heated to melt the powder and form a uniform coating), spray coating (where liquid plastic is sprayed onto the component to form a thin, uniform layer), or film coating (where a pre-made plastic film is applied to the component and fixed under heat or pressure). The thickness of the plastic coating depends on the electrical requirements. The following plastic materials, which have good insulation properties and high temperature resistance, are suitable for forming electrical insulation, for example by means of a plastic coating: polyimide (PI), polyether ether ketone (PEEK), polyethylene terephthalate (PET), epoxy resin (EP), polyvinyl chloride (PVC), fluoroplastics (e.g., PTFE), or mixtures thereof, but the invention is not limited thereto.

[0028] According to one embodiment, the stator core comprises a stator lamination stack formed by a plurality of stator laminations arranged in layers, wherein the stator laminations and / or the stator lamination stack has an insulating coating. The stator lamination stack is initially formed by correspondingly arranging pre-fabricated (e.g., stamped) stator laminations, and as described above, the insulating coating is preferably applied to the stator laminations and / or the stator lamination stack by anodizing the stator lamination stack or by coating with a plastic material. It is also contemplated that the stator lamination stack is formed from anodized stator laminations.

[0029] According to one embodiment, the winding has a plurality of conductor bars axially arranged to the stator core, wherein the support device described above as an embodiment of the connection arrangement or a supplement to it has a support element in which support grooves corresponding to and engaging with the conductor bars are provided. Electrical insulation between the winding or the individual conductor bars can be achieved by the support grooves having an insulating coating.

[0030] According to one embodiment of the above-described support device, the support device has a radial inner support element for engaging with a conductor rod and a radial outer support element for engaging with a conductor rod, wherein the inner support element and the outer support element each have an insulating layer or an insulating coating, and thus electrical insulation between the winding and the support device can be achieved.

[0031] According to one embodiment, the stator core and / or connection arrangement is designed to attach to a mechanically fixed base, which is specifically located on the machine side. Additional insulation, at least partially formed, is provided to insulate the stator core and / or connection arrangement from the mechanically fixed base. As a result, an additional or alternative insulating barrier is advantageously created between the connection arrangement and the remaining vehicle-side mechanical attachments of the stator, which improves insulation.

[0032] According to one embodiment, the aforementioned additional insulation is designed to be applied at least partially to an insulating layer between the stator core and / or the connecting arrangement and the mechanically fixed base, particularly designed to be insulating paper or insulating film.

[0033] According to another particularly optional embodiment, the aforementioned additional insulation is designed to be applied at least partially to the insulating coating of the stator core, connection arrangement, and / or base. Both embodiments achieve the advantages described above and allow for the flexible application of additional insulation depending on the stator and / or machine configuration and associated insulation performance requirements.

[0034] According to another particularly optional embodiment, the insulating coating can be formed by at least partially anodizing the stator core, connection arrangement, and / or base, or by at least partially coating the stator core, connection arrangement, and / or base with a plastic material. The above embodiments achieve the advantages already described and allow for the flexible application of additional insulation depending on the stator and / or machine configuration and associated insulation performance requirements.

[0035] Additional insulation can also be formed by an air gap between the stator core and the windings. This utilizes the self-supporting design of the windings, which can be arranged without support on the stator core. The dominant capacitance between the windings and the stator core can also be reduced through the insulating air gap.

[0036] According to one embodiment of the method for producing a stator, providing additional insulation includes applying at least a portion of an insulating coating to the connection arrangement and / or the stator core, or introducing at least a portion of an insulating layer by inserting insulating paper or an insulating film between the stator core and the connection arrangement. In this way, there is a flexible possibility of introducing additional insulation and thus improving insulation performance, which can be adapted to the conditions and requirements of the electric machine equipped with the stator.

[0037] According to one embodiment of the method for producing a stator, applying an insulating coating includes at least partial anodizing or at least partial coating with a plastic coating.

[0038] According to one embodiment of the method for producing a stator, the connection arrangement includes providing a support device designed to engage with the end of a conductor bar at at least one axial end for torque support of the stator, and at a position arranged axially offset from the stator core, the support device engages with at least one axial end of the conductor bar end in a form-fitting manner. As a result, additional insulation can be formed in a simple manner and immediately adjacent to the stator and / or correspondingly added additional insulation.

[0039] According to one embodiment of the method for producing a stator, the support device has an inner radial support element for engagement with a conductor rod and an outer radial support element for engagement with the conductor rod. In this embodiment, providing additional insulation between the stator core and the support device includes applying an insulating coating to the inner and / or outer support elements, or introducing an insulating layer between the inner and / or outer support elements and the stator core. Therefore, the arrangement of insulation can be further improved and flexibly supplemented or provided.

[0040] According to one embodiment of the method for producing a stator, providing a connection arrangement includes providing a portion of an electric motor as the connection arrangement, wherein a direct or indirect connection is provided between the stator core and the connection arrangement, and wherein providing additional insulation includes applying an insulating coating, at least partially, to the portion of the electric motor. In particular, in the case of vehicle-integrated electric motors (e.g., in the form of a hub drive), the connection arrangement or portion of the electric motor may be a wheel bracket or a fork-like rod. This has the advantage that the insulation can be designed such that insulation exists in the mechanical connection between the stator and the electric motor, and the stator is thus insulated from the electric motor via the connection arrangement.

[0041] According to one embodiment of the method for producing a stator, providing a stator core includes producing a stator lamination stack, wherein the stack comprises individual stator laminations having recesses, particularly for forming stator slots, and insulation is provided by applying an insulating coating to the stator laminations and / or the stator lamination stack. In this way, the stator lamination stack can be manufactured in a very economical manner, and the insulating coating may have been applied to the stator laminations or subsequently applied to the finished stator lamination stack to achieve electrical insulation between the windings and the stator core. The stator lamination stack may also preferably be formed in a region at at least one axial end as a support device for torque support.

[0042] According to one embodiment of the method, providing insulation includes applying an insulating coating to a connection arrangement formed as a support device in one embodiment, or introducing an insulating layer by inserting insulating paper or an insulating film between the winding and the support device. In this case, electrical insulation can be achieved during the assembly of the components. In particular, since the winding is designed to be self-supporting, interference fits between stator components can be eliminated, making it easier to insert insulating elements such as insulating paper or an insulating film during stator assembly, thereby achieving significantly better electrical insulation.

[0043] According to a further embodiment of the above-described method, this includes providing insulation by applying an insulating coating to the support device and / or the stator core. Applying the insulating coating preferably includes anodizing or coating a plastic coating as described above. Combinations of coating methods are also possible, wherein the choice of coating method is specifically determined in advance by the material of the stator core or support device.

[0044] To transmit torque in a radial flux twin-rotor machine, the stator and / or connecting arrangement is coupled to a mechanically fixed base. One possible embodiment provides through holes for press-fit fasteners (such as screws). However, form-fit connections and / or material-locking connections are also conceivable. According to one possible embodiment of the radial flux twin-rotor machine, the stator and / or connecting arrangement is fixed to the base and thus transmits torque to the stationary portion of the motor. The entire stator and / or connecting arrangement, or the individual components, can be attached to the machine's base (such as a housing).

[0045] According to another embodiment of the radial flux dual-rotor machine according to the invention, the connection arrangement is designed as a support device that, for torque support, engages in a form-fitting manner with at least one axial end of the winding and is supported on a base.

[0046] According to another embodiment of the radial flux dual-rotor machine according to the invention, the connection arrangement is designed as part of the radial flux dual-rotor machine and is configured for direct or indirect connection to the stator core. In particular, in the case of a vehicle-integrated radial flux dual-rotor machine (e.g., in the form of a hub drive), the connection arrangement can be a wheel bracket or a fork-shaped rod. This has the advantage that insulation can be designed such that insulation exists in the mechanical connection between the stator and the motor, and the stator is thus insulated from the motor via the connection arrangement. Therefore, two or more insulating barriers can also be formed at the same point or multiple points in the radial flux dual-rotor machine, which further increases the overall insulation and further reduces capacitance.

[0047] According to another embodiment of the radial flux twin-rotor machine according to the invention, additional insulation can be formed by an insulating layer disposed at least partially between the base and the connecting arrangement and / or the stator core. Thus, electrical insulation is provided between the stator and the other components of the radial flux twin-rotor machine, and the capacitance present therein is reduced. The insulating layer can preferably be formed in a simple manner, during or before the stator is assembled into the radial flux twin-rotor machine, by insulating paper inserted between the base and the connecting arrangement and / or the stator, or by an insulating film disposed between the base and the connecting arrangement and / or the stator.

[0048] According to another embodiment of the radial flux dual-rotor machine according to the invention, this additional insulation can be formed by applying an insulating coating, at least partially, to the base. It is considered particularly advantageous that the insulating coating can be formed by anodizing the base or by coating the base with a plastic material.

[0049] According to another embodiment of the method for producing a radial flux twin-rotor machine, the step of providing additional electrical insulation includes applying at least a portion of an insulating coating to the base, or introducing at least a portion of the insulating layer by inserting insulating paper or an insulating film between the base and the connecting arrangement and / or the stator core. This also helps improve electrical insulation and thus reduces the capacitance between the stator and the mechanically fixed parts of the radial flux twin-rotor machine, and thus improves their efficiency while reducing electromagnetic radiation.

[0050] According to another embodiment of the method for producing a radial flux twin-rotor machine, the step of providing additional electrical insulation alternatively or additionally includes applying an insulating coating by at least partially anodizing the base or by at least partially coating the base with a plastic material.

[0051] The above embodiments and further developments can be combined with each other in any meaningful way. In particular, all features of the stator can be applied to methods of producing the stator, and vice versa. Furthermore, all features of the stator can be applied to corresponding radial flux dual-rotor machines and vehicle axles having such radial flux dual-rotor machines and / or vehicles having such vehicle axles.

[0052] The above embodiments and further developments can be combined with each other in any meaningful way. Other potential embodiments, further developments, and implementations of the invention include combinations of features of the invention not explicitly mentioned above or below with reference to exemplary embodiments. In particular, those skilled in the art will also add various aspects as improvements or additions to the corresponding basic form of the invention. Attached Figure Description

[0053] The invention will now be explained in more detail based on exemplary embodiments specified in the accompanying drawings. In the drawings: FIG1 is a schematic longitudinal sectional view of a stator; FIG2 is a schematic longitudinal sectional view of a radial flux dual rotor machine; FIG3 is an exploded view of a stator according to one embodiment; FIG4 is an exploded view of a radial flux dual rotor machine according to one embodiment; FIG5 is an exploded view of a radial flux dual rotor machine according to another embodiment; FIG6 is a perspective view of the radial flux dual rotor machine according to FIG5 in an installed state; FIG7 is a perspective longitudinal sectional view of a radial flux dual rotor machine according to another embodiment; FIG8 is an exploded view of a stator lamination stack of a stator core; FIG9 is a circuit diagram of capacitors within a radial flux dual rotor machine; FIG10 is a flowchart of a method for producing a stator; and FIG11 is a flowchart of a method for producing a radial flux dual rotor machine.

[0054] The accompanying drawings are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and are used to explain the principles and concepts of the invention in conjunction with the description. Other embodiments and numerous advantages mentioned are derived from the drawings. Elements in the drawings are not necessarily shown to scale.

[0055] Unless otherwise stated, identical, functional, and operational elements, features, and components shall have the same reference numerals in the accompanying drawings. Detailed Implementation

[0056] Figure 1 is a schematic longitudinal cross-sectional view of stator 1. This is a schematic diagram of stator 1 for a radial flux dual-rotor machine 10 (see Figure 2), particularly for a hub motor. Stator 1 has stator core 2, windings 3, and a schematically illustrated connection arrangement 33, which is designed as part of the electric motor, particularly a wheel bracket or fork, and is configured for direct or indirect connection to stator core 2. Stator core 2, windings 3, and connection arrangement 33 are arranged rotationally symmetrically about the marked central axis M. Windings 3 are designed to be self-supporting for torque support of stator 1 and protrude beyond stator core 2 at at least one axial end 4. Of course, windings 3 are electrically insulated. In addition to the electrical insulation of windings 3, stator 1 has other options for electrical insulation from connection arrangement 33 to reduce capacitance. For example, an insulating layer 30 can be provided between windings 2 and connection arrangement 33 for electrical insulation. This insulating layer can be designed as insulating paper or insulating film inserted between stator core 2 and connection arrangement 33. The axial extension of winding 3 extends beyond end 4 of stator core 2 through insulating layer 30, which insulates connection arrangement 33 from stator core 2. In addition to or together with insulating layer 30, both stator core 2 and connection arrangement 33 may be provided with insulating coating 31, depending on the respective materials of stator core 2 and connection arrangement 33, which has been formed by anodizing or applying an insulating plastic layer. Combinations are also possible.

[0057] Figure 2 is a schematic longitudinal cross-sectional view of a radial flux dual-rotor machine 10. This is also a purely illustrative schematic diagram. In addition to the stator 1 according to Figure 1, the radial flux dual-rotor machine 10 also has a mechanically fixed base 11, a first rotor 12, and a second rotor 13. The stator core 2, windings 3, connecting arrangement 33, base 11, first rotor 12, and second rotor 13 are also arranged rotationally symmetrically about the marked central axis M. The windings 3 are designed to be self-supporting for torque support of the stator 1 and protrude beyond the stator core 2 at at least one axial end 4, and are supported on the base 11 via the connecting arrangement 33 shown purely schematically in Figure 2. The connecting arrangement 33 is axially offset from the stator core 2 and is form-fitted to the windings 3 at at least one axial end 4 for torque support. The connecting arrangement 33 is further connected to the base 11 so that torque can be supported on the base 11 via the connecting arrangement 33.

[0058] The first rotor 12 is radially arranged inside the stator core 2, and the second rotor 13 is radially arranged outside the stator core 2. The base 11 can be designed, for example, as the housing of the machine, and is shown herein purely illustratively as an L-shaped structure with two legs 7, 8. This illustration should not be considered exhaustive; rather, the base 11 and the connection arrangement 33 may have additional components and / or structural sections or configurations, and serve to establish a mechanical connection between the stator 2 and the electric machine. The connection arrangement 33 and the base 11 may be integrally or partially insulated, thereby forming multiple insulating barriers between the stator 1 or stator core 2 and the electric machine. The first leg 7, shown schematically herein, extends substantially radially, and the second leg 8 extends substantially axially, at a maximum distance from the central axis M. The connection arrangement 33 is shown purely schematically as a single radially extending piece, but the connection arrangement may also be multi-part and / or have other geometries. As shown in the figure, the overlap of winding 3 and base 11 is merely for illustrative purposes and does not imply a direct connection between stator 2 and connection arrangement 33, base 11, or the electric motor. Winding 3 is preferably connected to base 11 via support element 25 for torque support. To electrically insulate stator 2 from base 11 and reduce capacitance, multiple electrical insulation layers 30 can be provided between connection arrangement 33 and base 11. The insulation can be designed, for example, as insulating paper or film inserted between connection arrangement 33 and base 11. In addition to or together with the insulating layer 30, connection arrangement 33 and base 11, stator 1, or stator core 2 can all be provided with an insulating coating 31, creating two or more insulating barriers between stator 1 or stator core 2, connection arrangement 33, base 11, and the electric motor. Depending on the intended use and installation conditions or circumstances, and the corresponding materials of connection arrangement 33, base 11, stator 1, or stator core 2, the insulation can be formed by anodizing or by applying an insulating plastic layer. Combinations are also possible.

[0059] Figure 3 shows an exploded view of a stator 1 according to one embodiment. The stator 1 has a winding 3, a stator core 2, and a connection arrangement 33, which, in an exemplary embodiment, is designed as a support device 5 formed by a support element 25, wherein an advantageous exemplary embodiment of the support device 5 is shown in more detail here in a perspective view. The winding 3 consists of an inner layer and an outer layer having a plurality of conductor rods 6 connected to each other, like a frame of rods. The conductor rods 6 in the inner and outer layers are arranged helically opposite each other and are material-locked at the ends of the conductor rods to radial conductor members 17 that connect the inner and outer layers.

[0060] In the illustrated embodiment, for example, the stator core 2 and the support device 5 are each composed of two parts. To assemble the stator 1, the winding 3, stator core 2, and support device 5 are nested together. After assembly, these parts are coaxially oriented relative to each other on the same central axis M. The exemplary two-part support device 5 is arranged axially offset from the other parts and forms the innermost and outermost parts of the stator 1. The support device consists of an inner ring 27 and an outer ring 28, each designed with grooves for engaging with the shape of a conductor bar. The exemplary two-part stator core 2 is formed with two stator lamination stacks 18 that rotate helically in opposite directions. These two stator lamination stacks may also be insulated from the support device 5, as will be discussed in more detail with reference to FIG8. In other embodiments, the stator core 2 and the support device 5 may also be designed as single parts or have more than two parts.

[0061] As shown in Figure 3, the insulating layer 30 or insulating coating 31 can be formed on both the stator core 2 and the support device 5 in the manner described above, helping to reduce the capacitance between the components. The stator core 2 can have the insulating coating 31, which insulates the stator core from the winding 3 and from the support device 5. The support device 5 itself can also have the insulating coating 31. Alternatively or additionally, the insulating layer 30 can be optionally provided between the support device 5 and the stator core 2, for example by inserting insulating paper or insulating film of a size and geometry corresponding to the support device 5 (see Figure 5). It is inserted before the stator core 2 and the support device 5 are shaped together. Of course, insulation can also be formed only in certain areas or sections on the respective components.

[0062] Figure 4 shows an exploded view of a radial flux dual-rotor machine 10 according to one embodiment. In addition to the components of the stator 1, the radial flux dual-rotor machine 10 also includes a first rotor 12, a second rotor 13, and a base 11 (shown only partially schematically), which is part of the illustrated electric machine. The first rotor 12 is radially arranged inside the stator core 2, and the second rotor 13 is radially arranged outside the stator core. The rotors 12 and 13 are preferably made of a soft magnetic solid material and have permanent magnets (so-called surface-mount magnets) as magnetic poles disposed on their respective surfaces facing the stator core 2. In other embodiments, other rotors known to those skilled in the art may also be used, such as rotors with embedded magnets, squirrel-cage rotors, or electrically excited rotors. For clarity, the base 11 is shown only schematically here. As described in Figure 2, the base 11 is attached to the connection arrangement 33 in the mounted state. The base 11 is mechanically fixed relative to a reference frame (e.g., a support for a vehicle axle). To insulate the base 11 from the support device 5 or the connection arrangement 33, an insulating layer 30 may be formed or an insulating coating 31 may be applied.

[0063] Figure 5 shows an exploded view of a radial flux dual-rotor machine 10 according to another embodiment. The radial flux dual-rotor machine 10 here has substantially the same components as explained with respect to Figures 3 and 4, i.e., the connection arrangement 33 is designed here as a support device 5; however, the invention is not limited thereto. The stator core 2 and winding 3 are shown in an assembled state on the left side of the figure. For clarity, the first rotor 12 and the second rotor 13 are not shown in Figure 5. The support device 5 shown on the right side is designed as a two-part support element 25, and differs in the design of the corresponding annular inner support element 27 and outer support element 28. The support elements 27, 28 are equipped with support grooves 26. The support grooves are located on the inner circumference in the case of the outer support element 28, and on the outer circumference in the case of the inner support element 27, to engage with the conductor rods 6 of the winding 3. The support grooves 26 are angled according to the helical path or pitch axial direction of the conductor rod, such that they can engage with the conductor rods 6 of the winding 3. The support elements 27, 28 are preferably made of conductive metal, particularly preferably aluminum alloy. The two-part design of the support elements 27 and 28 makes the support groove 26 easily accessible during production for mechanical or machining operations.

[0064] The inner support element 27 and the outer support element 28 are each provided with a plurality of holes 9 around their circumference for attachment to the base 11 (not shown in FIG. 5) or another connection arrangement 33. The holes 9 are arranged here to be evenly distributed around the circumference, for example, along the bolt circle. Each hole 9 is located slightly outside the body of the support element and the support elements 27, 28, and thus forms a star shape on the circumference facing away from the winding 3. Of course, other distributions of the holes 9 and other types of fasteners for connection to the base 11 are conceivable.

[0065] In the exemplary embodiment shown in FIG5, an insulating layer 30 is disposed between the stator core 2 and the support device 5. This insulating layer is formed of an annular element having a recess for engaging with the conductor rod 6 of the winding 3, and sliding onto the axially protruding end of the conductor rod 6 during assembly, and resting on the stator core 2 or the laminated core forming the stator core. The insulating layer 30 is formed of an insulating material (such as plastic or insulating paper) and insulates the stator core 2 or winding 3 from the support device 5, forming a first insulating barrier.

[0066] The winding 3 and the stator core 2 also have an insulating coating 31, which is applied before or after assembly.

[0067] In addition to the insulating layer 30, an insulating coating 31 may be provided for the entirety or part of the support device 5. For example, the insulating coating 31 may be applied to the support grooves 26 of the outer support element 28 and the inner support element 27, which engage with the axially projecting ends 4 of the conductor rod 6.

[0068] Figure 6 shows a perspective view of the radial flux dual-rotor machine 10 according to Figure 5 in its installed state, but rotors 12 and 13 are not shown. The support device 5, shown here in installed state 5, is fixed to the machine housing (not shown) serving as the base 11 via holes 9, and thus transmits torque to the mechanically fixed portion of the radial flux dual-rotor machine 10. In this way, the torque generated by the radial flux dual-rotor machine 10 can be effectively supported. The support element 5 is fixed by corresponding fasteners (not shown), such as screws. The conductor bars 6 of the winding 3 extend axially beyond the stator core 2 and the first rotor 12 and the second rotor 13 (not shown). The radially inner and radially outer spirally arranged conductor bars 6 are respectively connected to each other outside the stator core 2. Support elements 27 and 28 are shown here engaging with the conductor bars 6 of the winding 3. The conductor bars 6 are shown placed in each support groove 26 such that all conductor bars 6 are form-fitted to the support device 5. Therefore, the torque supported by the winding 3 can be supported via the support device 5 fixed to the base 11 at holes 9.

[0069] The insulating layer 30 shown in Figure 5 (e.g., in the form of an inserted insulating paper or film with recesses for engagement with the conductor rod) is introduced between the stator core 2 and the support device 5 for insulation before assembly. Insulation is also provided by an insulating coating 31, which is formed on the respective elements after the stator core 2 and the support device 5 have been manufactured but before their assembly (e.g., by anodizing or plastic coating).

[0070] Specifically, when the support elements 27 and 28 are made of aluminum alloy, the insulating layer 31 can be formed by anodizing the support elements 27 and 28. The insulating layer 30 or insulating coating 31 shown in Figures 5 and 6 (which can be provided individually or in combination) insulates the support device 5 from the stator core 2, winding 3 and rotor 12 and 13 on the one hand, and from the base 11 on the other hand, and advantageously forms multiple insulating barriers.

[0071] Figure 7 shows a perspective longitudinal cross-sectional view of a radial flux dual-rotor machine 10 according to another embodiment. This embodiment substantially corresponds to the assembly of the radial flux dual-rotor machine 10 according to Figures 4 and 5, the components of which will be discussed in detail below. The stator core 2 has an inner sub-stack 23 and an outer sub-stack 24. The sub-stacks 23, 24 extend in a ring between the first rotor 12 and the second rotor 13. Due to the cross-sectional view, the inner layer 14 and the outer layer 15 of the conductor rod 6 can also be seen extending within the sub-stacks 23, 24.

[0072] The radial flux dual-rotor machine 10 shown is a so-called "yokeless" design, in which the yoke between the two teeth is not located in the functionally relevant flux. Although the stator yoke 32 thus extends between the conductor bars 6, this is only used to mechanically hold the stator lamination stack 18 together. For example, in the illustrated embodiment, the radial yoke thickness can be correspondingly thin and is about 10% of the total radial stator thickness. The relatively low yoke thickness also reduces undesirable magnetic leakage flux in the yoke. In other embodiments, for this purpose, the radial yoke thickness can be less than 30% of the total radial stator thickness, preferably less than 20% of the total radial stator thickness, and particularly preferably less than 10% of the total radial stator thickness. In an exemplary embodiment, the stator core 2 has an insulating coating 31 that provides electrical insulation between the stator core 2 and the windings 3 on the one hand, and insulation between the stator core 2 and the support device 5 on the other hand. In an exemplary embodiment, the insulating coating 31 is designed in the form of a plastic coating on the stator lamination stack 18, which is applied after the stator lamination stack is stacked and before the conductor bars 6 are inserted. The plastic coating can be applied, for example, by impregnation or during spraying. An insulating layer 30 is disposed between the support device 5 and the stator core 2. To form this insulating layer, an annular insulating paper or annular insulating film or disc (shown in FIG. 5 and having recesses for engaging with the conductor rod end 16 or for sliding on the conductor rod end) is attached to the support device 5 before the form-fit arrangement of the support device 5, and is held in place during the form-fit arrangement between the support device 5 and the stator core 2. Additionally, there is the possibility of improving insulation by establishing an additional insulating barrier, for example by providing an insulating coating 31 (e.g., an anodized layer or plastic coating) to the support device 5 or support elements 27, 28. This insulates the support device 5 or the stator 2 with which it forms fits from the base 11, as shown in FIG. 4. Here, the support device 5 also has an inner support element 27 and an outer support element 28. The support elements 27, 28 are clearly shown here as axially offset from the stator 2 and rotors 12, 13. Furthermore, at least in a portion, the support elements 27, 28 are shown to be shaped and engaged with the conductor rods 6 of the inner layer 14 and the outer layer 15.

[0073] Furthermore, it is clearly shown here that the conductor rods 6 of the inner layer 14 and the outer layer 15 are connected at the conductor rod ends 16 via radially arranged conductor rod sheets 17. This connection is preferably established as a material-locked connection, for example, by laser beam welding. Surface-mounted magnets of rotors 12 and 13 are also shown in the cross-section. The first rotor 12 has a plurality of permanent magnets 29 mounted on its outer circumferential surface. The second rotor 13 has a plurality of permanent magnets 29 mounted on its inner circumferential surface. A particularly advantageous embodiment can be achieved if the rotor is made of a soft magnetic solid material and has surface-mounted permanent magnets 29. In this embodiment, rotors 12 and 13 can be manufactured in a very cost-effective manner and high efficiency can be achieved.

[0074] Figure 8 shows an exploded view of the stator lamination stack 18 of the stator core 2. As already mentioned, the stator lamination stack 18 of the stator core 2 has an inner lamination stack 23 and an outer lamination stack 24. This facilitates the generation of stator slots 19 that rotate relative to each other in opposite directions, wherein similar inner stator laminations 21 and outer stator laminations 22 are stacked relative to each other and have recesses at the same points. In other embodiments, the stator laminations 21, 22 may also be designed as single-part structures, such that multiple stator laminations 21, 22 of different shapes are provided with recesses of different arrangements and are stacked in the order required to form the stator slots 19. In still other embodiments, a completely single-part stator core 2 is also conceivable, which can be produced, for example, by additive manufacturing. Insulation can also be provided by applying an insulating coating 31 to the individual stator laminations 21, 22. The stator lamination stack 18 may also be formed in the region of at least one axial end 4 as a support device 5 for torque support.

[0075] In the illustrated two-part design, the inner diameter of the outer sub-stall 24 is almost equal to the outer diameter of the inner sub-stall 23. This allows the inner sub-stall 23 to be coaxially arranged within the outer sub-stall 24. The sub-stalls 23 and 24 are composed of individual annular stator laminations 21 and 22 stacked one on top of the other. The stator laminations 21 of the outer sub-stall 24 are manufactured with recesses positioned around the outer circumference to form the outer stator slots 19. The stator laminations 22 of the inner sub-stall 23 are manufactured with recesses positioned around the inner circumference to form the inner stator slots 20. For example, the stator laminations 21 and 22 are advantageously manufactured by stamping due to edge quality and very low manufacturing cost.

[0076] The inner stator slot 20 and the outer stator slot 19 are described as helices extending in opposite directions with the same pitch, characterized by the sweep angle α of the marked stator slots. The sweep angle α of the stator slots is defined by the angle between the position of the same stator slot on one axial side of the stator core 2 and its position on the other axial side of the stator core 2 relative to the central axis M.

[0077] In all embodiments, the insulating coating 31 can be formed by applying, for example, a plastic coating or anodizing to the assembled stator core 2 or the two sub-stacks 23, 24 or stator laminations 21, 22 that form the stator core 2, respectively.

[0078] Figure 9 is a circuit diagram of a capacitor in a radial flux twin-rotor machine according to the present invention.

[0079] This figure illustrates various capacitances within a radial flux dual-rotor machine, particularly a radial flux dual-rotor machine for a hub motor. These capacitances are generated by the electrical insulation E and physical arrangement of components within the motor. For illustrative purposes, exemplary capacitance values ​​from a reference machine are specified in nanofarads (nF). The capacitances are characterized as follows: C Wi_St : The capacitance between winding 3 and stator core 2. This capacitance is generated by the insulation between winding 2 and stator core 2. This capacitance is one of the dominant capacitances in the system. Reference value: 87nFC Wi_Ro : The capacitance between winding 3 and rotors 12 and 13. This capacitance represents the electrical coupling between winding 3 and rotors 12 and 13. Due to the greater distance and better insulation, this capacitance is much lower than the capacitance between winding 3 and stator core 2. Reference value: 0.2nFC St_Ro Capacitance between stator 1 and rotors 12 and 13. This capacitance is generated by the physical proximity and insulation between stator 1 and rotors 12 and 13. Reference value: 1.2 nFC StWC Capacitance between stator core 2 and connection arrangement 33. This capacitance is generated by the insulation between the stator core and connection arrangement 33. Reference value: 15nFC WC_SC : The capacitance within winding 3 itself. This capacitance represents the internal capacitive coupling within winding 3 caused by the physical proximity and insulation between the individual conductor rods 6 of winding 3. Reference value: 7nFC 轴承 Capacitance in the bearings. This capacitance is generated by the electrical insulation and thin lubricant film in the bearings between rotors 12 and 13 and the machine housing. Reference value: 0.2 nFU CM Power source. The power source refers to the voltage supplied to the motor.

[0080] G: Ground. The bottom of the circuit diagram is connected to ground, representing the electrical reference for these capacitors.

[0081] The circuit diagram illustrates the capacitance characteristics within a motor. The capacitance value is crucial for optimizing insulation (E) and reducing losses, which improves motor efficiency and reduces electromagnetic radiation. Insulating components with two or more insulating barriers (E) minimizes charging and discharging losses and enhances the motor's mechanical stability and electrical safety. The circuit shown provides an analysis of capacitive coupling after insulation (E) of individual components in a radial flux dual-rotor machine. Insulation (E) of components, as described above, leads to reduced capacitance, and thus reduced losses and electromagnetic radiation, contributing to improved motor efficiency.

[0082] Figure 10 shows a flowchart of a method for producing a stator 1. The method includes a first step: providing a stator core 2, S1 having a radially outer stator slot 19 and a radially inner stator slot 20. Another step involves inserting individual conductor rods 6 through the inner stator slot 20 and the outer stator slot 19 via a insertion S2. The conductor rods 6 are inserted specifically in the axial direction. Furthermore, a step S3 is provided to connect the conductor rods 6 inserted in the inner and outer stator slots at their ends 16 to form conductor rings, thereby forming a winding 3 with conductor rings, which is designed to be self-supporting for torque support of the stator 1. In a further step S4, insulation is provided between the winding 3 and the connection arrangement 33; followed by a further step S5: at a position arranged axially offset from the stator core 2, the connection arrangement 33 is shaped-fitted with at least one axial end of the conductor rod end 16.

[0083] Figure 11 shows a flowchart of a method for producing a radial flux dual-rotor machine 10, particularly a radial flux dual-rotor machine 10 according to the invention. The method includes a first step: providing a mechanically fixed base 11 (S10). A further step (S20) involves providing a connection arrangement 33 for the stator 1 according to the invention, which engages with the stator core 2 in a form-fit manner and provides insulation as explained above. Furthermore, a step (S30) is provided in which at least one additional electrical insulation is provided between the base 11 and the connection arrangement 33, followed by a final step (S40) whereby the stator 1 and / or the connection arrangement 33 is attached to the base 11.

[0084] Although the invention has been described above entirely based on preferred exemplary embodiments, the invention is not limited thereto and can be modified in various ways.

[0085] List of reference numerals: 1. Stator; 2. Stator core; 3. Winding; 4. Axial end; 5. Support device; 6. Conductor bar; 7. First leg; 8. Second leg; 9. Hole; 10. Radial flux dual-rotor machine; 11. Base; 12. First rotor; 13. Second rotor; 14. Radial outer layer; 15. Radial inner layer; 16. Conductor bar end; 17. Conductor bar lamination; 18. Stator lamination stack; 19, 20. Stator slots; 21, 22. Stator laminations; 23. Inner lamination stack; 24. Outer lamination stack; 25. Support element; 26. Support groove; 27. Inner support element; 28. Outer support element; 29. ​​Permanent magnet; 30. Insulating layer; 31. Insulating coating; 32. Stator yoke; 33. Connection arrangement α; Sweep angle M of stator slot; Central axis C. Wi_St The capacitance C between the winding and the stator core Wi_Ro The capacitance C between the winding and the rotor St_Ro The capacitance C between the stator and rotor StWC The capacitance C between the stator core and the support device WC_SC The capacitance C within the winding itself 轴承 Capacitor U in the bearing CM Power supply G Ground E Insulation S1 Step S2 Step S3 Step S4 Step S5 Step S10 Step S20 Step S30 Step S40 Step.

Claims

1. A stator (1) for a radial flux dual-rotor machine (10), particularly for a hub motor, said stator comprising: - Stator core (2); - A winding (3) placed in the stator core (2), the winding being designed to be self-supporting for torque support of the stator (1) and having insulation relative to the stator core, wherein the winding (3) protrudes beyond the stator core (2) at at least one axial end (4); - A mechanical connection arrangement (33) associated with the stator core (2), wherein the connection arrangement (33) has at least one additional electrical insulation (E) formed at least partially.

2. The stator (1) according to claim 1, characterized in that, The connection arrangement (33) is formed as a support device (5) for engaging with the winding (3) at at least one axial end (4) for torque support, and has additional insulation (E).

3. The stator (1) according to claim 2, characterized in that, The support device (5) has a radial inner support element (27) for engaging with the conductor rod (6) and a radial outer support element (28) for engaging with the conductor rod (6), and the radial inner support element (27) and / or the outer support element (28) each have additional insulation (E).

4. The stator (1) according to claim 1 or 2, characterized in that, The connection arrangement (33) is designed as part of the electric motor, particularly as part of the wheel bracket or fork rod, and is configured to be directly or indirectly connected to the stator core (2).

5. The stator (1) according to any one of claims 1 to 4, characterized in that, The insulation (E) is designed as an insulating layer (30) disposed between the stator core (2) and the connection arrangement (33).

6. The stator (1) according to claim 5, characterized in that, The insulating layer (30) can be formed from insulating paper or insulating film.

7. The stator (1) according to any one of the preceding claims, characterized in that, The insulation (E) is designed as an insulating coating (31) applied to the stator core (2) and / or the connection arrangement (33).

8. The stator (1) according to claim 7, characterized in that, The insulating coating (31) can be formed by anodizing the stator core (2) and / or the connection arrangement (33) or by coating the stator core (2) and / or the connection arrangement (33) with a plastic material.

9. The stator (1) according to any one of the preceding claims, characterized in that, The stator core (2) comprises a stator lamination stack (18) formed by a plurality of stator laminations (21, 22) arranged in layers, and the stator laminations (21, 22) and / or the stator lamination stack (18) have the insulating coating (31), and wherein the stator lamination stack is preferably formed in the region of the at least one axial end (4) as a support device (5) for torque support.

10. The stator (1) according to any one of the preceding claims, characterized in that, The stator core (2) and / or the connection arrangement (33) are designed to be attached to a mechanically fixed base (11) and are provided with additional insulation (E) formed at least partially to insulate the stator core (2) and / or the connection arrangement (33) from the mechanically fixed base (11).

11. The stator (1) according to claim 10, characterized in that, The additional insulation (E) is designed to be applied at least partially to an insulating layer (30) between the stator core and / or the connection arrangement (33) and the mechanically fixed base (11), and is in particular designed to be insulating paper or insulating film.

12. The stator (1) according to claim 10, characterized in that, The additional insulation (E) is designed to be applied at least partially to the insulating coating (31) of the stator core (2), the connection arrangement (33), and / or the base (11).

13. The stator (1) according to claim 12, characterized in that, The insulating coating (31) can be formed by at least partially anodizing the stator core (2), the connection arrangement (33) and / or the base (11) or by at least partially coating the stator core (2), the connection arrangement (33) and / or the base (11) with a plastic material.

14. A method for producing a stator (1) for a radial flux dual-rotor machine (10), particularly a stator (1) according to any one of claims 1 to 13, the method comprising the steps of: - Provide a stator core (2) having corresponding radial outer stator slots (19) and corresponding radial inner stator slots (20); - Insert individual conductor rods (6) through the inner stator slots and outer stator slots (19, 20); - Connect the conductor rods (6) inserted into the inner stator slots and outer stator slots (19, 20) at the ends (16) of the conductor rods to form a winding with conductor loops, the winding being designed to be self-supporting for torque support of the stator (1); - Provide insulation between the stator core (2) and the winding (3); - Provide a connection arrangement (33); and - Provide at least one additional electrical insulation (E) that is at least partially formed between the stator core (3) and the connection arrangement (33).

15. The method according to claim 14, characterized in that, Providing the additional insulation (E) includes applying at least a portion of the insulating coating (31) to the connection arrangement (33) and / or the stator core (2), or introducing at least a portion of the insulating layer (30) by inserting insulating paper or insulating film between the stator core (2) and the connection arrangement (33).

16. The method according to claim 15, characterized in that, Applying the insulating coating (31) includes at least partial anodizing or at least partial coating with a plastic coating.

17. The method according to any one of claims 14 to 16, characterized in that, Providing a connection arrangement (33) includes: providing a support device (5) designed to engage in a form-fitting manner with the conductor rod end (16) at at least one axial end for torque support of the stator (1), and at a position axially offset from the stator core (2), the support device (5) engaging in a form-fitting manner with at least one axial end (4) of the conductor rod end (16).

18. The method according to claim 17, characterized in that, The support device (5) has a radially inner support element (27) for engaging with the conductor rod (6) and a radially outer support element (28) for engaging with the conductor rod (6), and provides additional insulation (E) between the stator core (3) and the support device (5) by applying an insulating coating (31) to the inner support element (27) and / or the outer support element (28), or by introducing an insulating layer (30) between the inner support element (27) and / or the outer support element (28) and the stator core (2).

19. The method according to any one of claims 14 to 18, characterized in that, Providing a connection arrangement (33) includes providing a portion of the electric machine, particularly a wheel bracket or a fork rod, as the connection arrangement (33), wherein a direct or indirect connection is provided between the stator core (2) and the connection arrangement (33), and providing additional insulation (E) includes applying at least a portion of an insulating coating (31) to the portion of the electric machine, particularly the wheel bracket or the fork rod.

20. The method according to any one of claims 14 to 19, characterized in that, Providing the stator core (2) includes producing a stator lamination stack (18), wherein individual stator laminations (21, 22) are stacked, and providing the additional insulation (E) includes applying an insulating coating (31) to the stator laminations (21, 22) and / or the stator lamination stack (18).

21. A radial flux dual-rotor machine (10), particularly a radial flux dual-rotor machine for hub drives, comprising: - A mechanically fixed base (11); - A stator (1) according to any one of claims 1 to 13; - A first rotor (12) radially arranged inside the stator core (2); - A second rotor (13) radially arranged outside the stator core (2); and - Additional electrical insulation (E) at least partially disposed between the base (11) and / or the connection arrangement (33) and the stator core (2).

22. The radial flux dual-rotor machine (10) according to claim 21, characterized in that, The connection arrangement (33) is designed as a support device (5) for torque support, the support device engaging with at least one axial end (4) of the winding (3) in a form fit and being supported on the base (11).

23. The radial flux dual-rotor machine (10) according to claim 21, characterized in that, The connection arrangement (33) is designed as part of the radial flux dual rotor machine (10), in particular as a wheel bracket or fork rod, and is configured to be directly or indirectly connected to the stator core (2).

24. The radial flux dual-rotor machine (10) according to any one of claims 20 to 23, characterized in that, The additional insulation (E) can be formed by at least a portion of an insulation layer (30) disposed between the base (11), the connection arrangement (33) and / or the stator core (2).

25. The radial flux dual-rotor machine (10) according to claim 24, characterized in that, The insulating layer (30) can be formed from insulating paper or insulating film.

26. The radial flux twin-rotor machine (10) according to any one of claims 21 to 25, characterized in that, The additional insulation (E) can be formed by an insulating coating (31) applied at least partially to the base (11).

27. The radial flux dual-rotor machine (10) according to claim 26, characterized in that, The insulating coating (31) can be formed by at least partially anodizing the base (11) or by at least partially coating the base (11) with a plastic material.

28. A method for producing a radial flux twin-rotor machine (10), particularly a radial flux twin-rotor machine (10) according to any one of claims 21 to 27, comprising the following steps: - Provide a mechanically fixable base (11); - Provide a stator (1) according to any one of claims 1 to 13, the stator having a connection arrangement (33) associated with the stator core (2); - Provide an additional electrical insulation (E) at least partially formed between the base (11) and the connection arrangement (33) and / or the stator core (2); and - Attach the connection arrangement (33) and / or the stator core (2) to the base (11).

29. The method according to claim 28, characterized in that, Providing the additional electrical insulation (E) includes applying at least a portion of the insulating coating (31) to the base (11), or introducing at least a portion of the insulating layer (30) by inserting insulating paper or insulating film between the base (11) and the connection arrangement (33) and / or the stator core (2).

30. The method according to claim 29, characterized in that, Applying the insulating coating (31) includes at least partially anodizing the base (11) or at least partially coating the base (11) with a plastic material.

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