DE102022004793A1 - Fastening arrangement of a laminated core of a stator to a housing of an axial flow machine, in particular for a motor vehicle, axial flow machine and motor vehicle - Google Patents

Abstract

The invention relates to a fastening arrangement (10) of a laminated core (12) of a stator (14) on a housing (16) of an axial flux machine, in which the laminated core (12) carries at least one winding (18, 20) of the stator (14) on each of its two axial end faces (S1, S2), wherein the laminated core (12) is fastened to the housing (16) via at least one connecting element (24) which is formed separately from the laminated core (12) and separately from the housing (16) and is connected to the housing (16), which is connected to a longitudinal region (L) of the laminated core (12) and thereby to the laminated core (12), the longitudinal region (L) of which is arranged in the axial direction of the stator (14) between respective winding regions (W1) of the windings (18, 20) which protrude outwards from the laminated core (12) in the radial direction (22) of the stator (14).

Description

The invention relates to a fastening arrangement of a laminated core of a stator on a housing of an axial flow machine, in particular of a motor vehicle. Furthermore, the invention relates to an axial flow machine, in particular for a motor vehicle. The invention also relates to a motor vehicle with at least one such axial flow machine.

The EN 10 2019 125 871 A1 is an axial flow machine as known, with a stator which is located between a first rotor disk and a second rotor disk. Furthermore, the EN 10 2021 124 998 A1 a stator for an electric axial flow machine. In addition, the EP 3 245 718 A1 a method for producing a stator of an axial flow machine is known. In addition, the US 2017/0117763 A1 a method for manufacturing an axial flow machine.

The object of the present invention is to provide a fastening arrangement of a laminated core of a stator to a housing of an axial flux machine, in particular of a motor vehicle, an axial flux machine, at least one such fastening arrangement and a motor vehicle with at least one such axial flux machine, so that a particularly advantageous fastening of the laminated core to the housing can be achieved.

This object is achieved by a fastening arrangement with the features of patent claim 1, by an axial flow machine with the features of patent claim 9 and by a motor vehicle with the features of patent claim 10. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

In the fastening arrangement according to the invention of a laminated core of a stator on a housing of an axial flux machine, i.e. an electrical machine designed as an axial flux machine, the laminated core carries at least one winding of the stator on each of its two axial end faces. Therefore, the respective winding is also referred to as the respective stator winding. The axial end faces of the laminated core point away from each other in the axial direction of the stator, so that a first of the windings is arranged on or on a first of the axial end faces and a second of the windings is arranged on or on a second of the axial end faces. This is particularly advantageous if the axial flux machine is designed in an H-construction or H-arrangement or has an H-construction or H-arrangement. Here, it is particularly provided that the axial flux machine in its fully manufactured state has a rotor which can be driven by means of the stator and can therefore be rotated about a machine axis of rotation relative to the stator. The machine axis of rotation coincides with the axial direction of the stator and thus of the rotor and the axial flux machine as a whole. The rotor has two rotor parts that are spaced apart from one another in the axial direction of the stator and the rotor and are designed, for example, as rotor disks, wherein the stator is arranged at least partially in the axial direction of the axial flow machine between the rotor parts, in particular such that a first of the rotor parts is at least partially overlapped by the stator, i.e. covered, in a first direction that runs parallel to the axial direction of the axial flow machine and points from the first rotor part to the second rotor part, wherein the second rotor part is at least partially overlapped by the stator in a second direction that runs parallel to the axial direction of the axial flow machine and is opposite to the first direction and points from the second rotor part to the first rotor part.

In order to be able to attach the laminated core to the housing in a particularly advantageous manner, the invention provides that the laminated core is attached to the housing via at least one or exactly one connecting element that is formed separately from the laminated core and separately from the housing and is connected to the housing. The connecting element is also connected to a length of the laminated core and thus to the laminated core, wherein the length of the laminated core is arranged in the axial direction of the stator and thus of the axial flux machine between respective winding regions of the windings that protrude outward from the laminated core in the radial direction of the stator. In other words, for example, the first winding has a first of the winding regions and the second winding has a second of the winding regions, wherein the winding regions protrude outward from the laminated core in the radial direction of the stator, thus protruding outward beyond the laminated core in the radial direction of the stator. The length of the length is arranged in the axial direction of the stator between the winding regions. In particular, the connecting element is connected to the housing in such a way that relative rotations between the connecting element and the housing in the circumferential direction of the stator running around the axial direction of the stator are avoided, so that the connecting element is connected to the housing in a rotationally fixed manner. Alternatively or additionally, for example, the connecting element is connected to the housing in such a way that relative movements between the connecting element and the housing in the axial direction of the axial flow machine or the stator omitted. The same can be applied to the connecting element and the laminated core. It is therefore preferably provided that the connecting element is connected in a rotationally fixed manner to the longitudinal region and thus in a rotationally fixed manner to the laminated core, so that the connecting element is preferably connected in such a way to the longitudinal region and thus to the laminated core that relative rotations between the connecting element and the laminated core in the circumferential direction running around the axial direction of the stator are omitted. Alternatively or additionally, the connecting element is connected in such a way to the longitudinal region and thus to the laminated core that relative movements between the connecting element and the laminated core in the axial direction of the stator are omitted, i.e. prevented.

The invention also includes an axial flow machine which has at least one fastening arrangement according to the invention. Advantages and advantageous embodiments of the fastening arrangement according to the invention are to be regarded as advantages and advantageous embodiments of the axial flow machine according to the invention and vice versa.

The invention includes a motor vehicle, referred to simply as a vehicle and preferably designed as a motor vehicle, in particular a passenger car, which has at least one axial flux machine according to the invention and can be driven, for example, in particular purely electrically, by means of the axial flux machine. Advantages and advantageous embodiments of the fastening arrangement according to the invention and the axial flux machine according to the invention are to be regarded as advantages and advantageous embodiments of the motor vehicle according to the invention and vice versa.

In particular, the axial flux machine is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 V, in particular greater than 60 V, and most preferably amounts to several hundred volts.

The invention is based in particular on the following findings and considerations: Conventional radial flux machines (RFM), also known as radial flux motors, usually have a cylindrical, stacked laminated core and windings that are inserted on an inner side and protrude axially beyond the laminated core, thus forming at least one winding head. Stators, in particular of radial flux machines, are often fastened in a housing in such a way that the laminated core of the respective radial flux machine is pressed into the housing via its smooth outer diameter, which means that even high torques can be safely transmitted between the laminated core and the housing.

Axial flux machines, on the other hand, have a central stator with axial windings on both sides, particularly in the double rotor design, i.e. in particular in an H-construction. The stator has a central toroidal core laminated core, for example, particularly in a design with distributed winding. In other words, it is conceivable that the laminated core of the stator is ring-shaped and thus designed as a ring, in particular as a toroidal core. In particular, the laminated core of a central toroidal core laminated core, which has, for example, respective recesses on its axial end faces, in particular designed as grooves, in which the windings are each at least partially arranged. The winding areas form respective winding heads, which, however, do not protrude outwards from the laminated core in the axial direction as in radial flux machines, but in the radial direction of the stator. It is also conceivable that further winding areas of the windings protrude inwards from the laminated core in the radial direction of the stator and thus form further, radially inner winding heads. The winding heads formed by the first winding areas that protrude outwards from the laminated core in the radial direction of the stator are also referred to as radially outer winding heads. The respective radially outer winding head is radially larger than the laminated core, so that it is usually not possible to press the laminated core directly onto or into the housing. Therefore, according to the invention, the connecting element is used as an additional element to connect the laminated core, also referred to as the stator laminated core, to the housing, i.e. to fasten it to the housing. The main function of the connecting element is, for example, to ensure secure torque transmission between the stator and the housing, particularly over a long service life of the axial flow machine.

Currently, there is no known large-scale application of double rotors with distributed winding with a toroidal core stack in the stator. However, the invention enables the stator to be manufactured in large-scale production. Axial flow machines have advantages in terms of high power density and power-to-weight ratio as well as their axially short structure. The major challenges to date have been industrialization for large-scale production and service life as well as advantageous noise behavior, also known as NVH behavior, particularly for the automotive sector. Due to their disk-shaped structure and large radial diameter, axial flow machines are significantly more susceptible to unwanted Noise, which makes this a decisive criterion for successful implementation in automotive engineering. There are designs with double rotors and single-tooth windings. The stator consists of many individual poles with windings that are later put together in one assembly. A single-tooth topology has fundamental disadvantages in terms of noise behavior compared to a distributed winding. The production of individual poles and the winding as such represents a robust process. The biggest disadvantage, however, is that the individual poles in the stator must be securely connected to one another and to the outside of the housing to form a robust, secure system. The winding is located radially around the poles, so there is hardly any surface to connect it. It is possible to integrate radially via the pole shoes, but only a very small surface is available here. Increasing the surface means more axial construction, which does not contribute to increasing the torque (copper). It is possible to glue the pole shoes axially to other poles via a closed disk and connect them to the housing. However, this has the disadvantage that the disc increases the air gap and thus reduces efficiency. The problems and disadvantages mentioned above can be avoided by the invention.

• - L-förmige oder I-förmige Gestaltung des Verbindungselements zur Vergrößerung der Anpressfläche
• - Verzahnung auf unrundes Blechpaket beziehungsweise Polygonverbindung
• - Verzahnung in Nuten durch einzelne Zähne am Verbindungselement, wie zum Beispiel Verzahnung in Wicklungsnut
• - Stiftverbindung: Löcher im Blechpaket gestanzt oder nachträglich eingebracht; Verbindungselement über das Blechpaket pressen; Stifte einschieben zur Drehmomentübertragung; Löcher angeordnet vorzugsweise zwischen zwei Polen im Nutgrund; vorzugsweise elektrisch isolierter Stift
• - Vergrößerung eines L- oder I-förmigen Blechs zusätzlich über die Zähne unterhalb der Wicklung zur Erhöhung der Fläche
• - Speichen von außen in das Blechpaket einpressen und am Gehäuse befestigen

The invention thus enables industrialization, i.e. large-scale production of the stator, as well as particularly advantageous noise behavior of the axial flow machine. The laminated core is preferably a central toroidal core laminated core, on which the windings are arranged axially on both sides. Preferably, the respective winding is designed as a respective distributed winding, i.e. formed. In particular, the invention enables secure integration of the stator into the housing. The connecting element can be made from steel, aluminum and/or a composite material (CFRP/GFRP), for example. The connecting element can be made from plates, made by sheet metal forming or made by casting, so that the connecting element can be designed as a cast component, for example. The connecting element can be made from solid material or individual, stacked, glued laminations. The connecting element has, for example, at least one or more through-openings, also referred to as holes, in its web between the laminated core and the housing, in order to be able to advantageously keep the weight and the electromagnetic losses low, particularly with regard to eddy currents. The connecting element preferably has an insulating distance from both windings. It is also conceivable that the connecting element has a coating for insulation. In other words, the coating mentioned is an electrically insulating coating with which, for example, a base body of the connecting element is provided. The connecting element can be attached to the housing and/or to the laminated core using the following methods: pressing in, thermal joining, non-circular, toothing, polygon, pin connection, spoke connection, screw connection, magnetic forming, material bonding and/or welding and/or soldering. The connecting element can have the following special shapes for connection to the laminated core and/or the housing:

• - L-shaped or I-shaped design of the connecting element to increase the contact surface
• - Gearing on non-circular sheet stack or polygon connection
• - Toothing in grooves by individual teeth on the connecting element, such as toothing in winding groove
• - Pin connection: holes punched in the laminated core or subsequently inserted; connecting element pressed over the laminated core; pins inserted for torque transmission; holes preferably arranged between two poles in the groove base; preferably electrically insulated pin
• - Enlargement of an L- or I-shaped sheet additionally over the teeth below the winding to increase the area
• - Press the spokes into the sheet metal package from the outside and attach them to the housing

• - geringste NVH-Anregung durch verteilte Wicklung
• - Ringkernblechpaket und Einlegung der Wicklung als großserientaugliche Prozesse; prozesssichere, kostengünstige und lebensdauersichere Integration des Blechpakets in das Gehäuse
• - prozesssichere Integration durch Stand der Technik-Materialien und -Prozesse
• - mechanisch sichere Abstützung aller auftretenden Kräfte, sowohl axial als auch radial
• - lebensdauersichere Integration durch mechanische Verbindung
• - definierte Positionierung des Stators nach Form und Lagetoleranzen
• - großserientaugliche und Stand der Technik-Einzelprozesse
• - kostengünstige Realisierung durch Großserienprozesse im Automobilbereich
• - Einhaltung aller Isolationsanforderungen zum Gehäuse und Wicklungen
• - keine beziehungsweise kaum Einflüsse auf elektromagnetisches Verhalten des Stators, da axial außerhalb des Luftspaltfelds und zwischen Wicklungen

The invention can realize at least the following advantages:

• - lowest NVH excitation due to distributed winding
• - Toroidal core lamination and winding insertion as processes suitable for large-scale production; process-reliable, cost-effective and service-safe integration of the lamination package into the housing
• - process-safe integration through state-of-the-art materials and processes
• - mechanically safe support of all occurring forces, both axial and radial
• - Lifetime-safe integration through mechanical connection
• - defined positioning of the stator according to shape and position tolerances
• - state-of-the-art individual processes suitable for large-scale production
• - cost-effective implementation through large-scale production processes in the automotive sector
• - Compliance with all insulation requirements for the housing and windings
• - no or hardly any influence on the electromagnetic behaviour of the stator, as it is axially outside the air gap field and between windings

The connecting element can, for example, be connected to the laminated core or to the length range and/or to the housing in a force-fitting and/or form-fitting manner. The connecting element can be designed in such a way that the pure laminated core (without windings) can be attached to the housing by the connecting element so that the windings can be added later, or the already wound stator can be attached to the housing by the connecting element through the stator core (laminated core).

Further advantages, features and details of the invention emerge from the following description of preferred embodiments and from the drawing. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and/or shown alone in the figures can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the invention.

• 1 ausschnittsweise eine schematische Längsschnittansicht einer ersten Ausführungsform einer Befestigungsanordnung eines Blechpakets eines Stators an einem Gehäuse einer Axialflussmaschine;
• 2 ausschnittsweise eine schematische Längsschnittansicht einer zweiten Ausführungsform der Befestigungsanordnung;
• 3 ausschnittsweise eine schematische und geschnittene Perspektivansicht der zweiten Ausführungsform;
• 4 ausschnittsweise eine schematische Längsschnittansicht einer dritten Ausführungsform der Befestigungsanordnung;
• 5 ausschnittsweise eine schematische Seitenansicht der dritten Ausführungsform der Befestigungsanordnung;
• 6 ausschnittsweise eine schematische und geschnittene Perspektivansicht der dritten Ausführungsform der Befestigungsanordnung;
• 7 ausschnittsweise eine schematische Längsschnittansicht einer vierten Ausführungsform der Befestigungsanordnung;
• 8 ausschnittsweise eine schematische und geschnittene Perspektivansicht der vierten Ausführungsform; und
• 9 ausschnittsweise eine schematische Längsschnittansicht einer fünften Ausführungsform der Befestigungsanordnung;
• 10 ausschnittsweise eine schematische und geschnittene Perspektivansicht der fünften Ausführungsform;
• 11 ausschnittsweise eine schematische Längsschnittansicht einer sechsten Ausführungsform der Befestigungsanordnung;
• 12 ausschnittsweise eine schematische Längsschnittansicht einer siebten Ausführungsform der Befestigungsanordnung;
• 13 ausschnittsweise eine schematische Längsschnittansicht einer achten Ausführungsform der Befestigungsanordnung;
• 14 ausschnittsweise eine schematische und geschnittene Perspektivansicht der achten Ausführungsform;
• 15 ausschnittsweise eine schematische Längsschnittansicht einer neunten Ausführungsform der Befestigungsanordnung;
• 16 ausschnittsweise eine schematische und geschnittene Perspektivansicht der neunten Ausführungsform;
• 17 ausschnittsweise eine schematische Längsschnittansicht einer zehnten Ausführungsform der Befestigungsanordnung;
• 18 ausschnittsweise eine schematische und geschnittene Perspektivansicht der zehnten Ausführungsform;
• 19 ausschnittsweise eine schematische Längsschnittansicht einer elften Ausführungsform der Befestigungsanordnung;
• 20 eine schematische Vorderansicht eines Gehäuses der elften Ausführungsform;
• 21 ausschnittsweise eine schematische und geschnittene Perspektivansicht der elften Ausführungsform der Befestigungsanordnung;
• 22 ausschnittsweise eine schematische Längsschnittansicht einer zwölften Ausführungsform der Befestigungsanordnung; und
• 23 ausschnittsweise eine schematische Längsschnittansicht einer dreizehnten Ausführungsform der Befestigungsanordnung.

The drawing shows in:

• 1 a detail of a schematic longitudinal sectional view of a first embodiment of a fastening arrangement of a laminated core of a stator to a housing of an axial flow machine;
• 2 a detail of a schematic longitudinal sectional view of a second embodiment of the fastening arrangement;
• 3 a partial schematic and sectional perspective view of the second embodiment;
• 4 a detail of a schematic longitudinal sectional view of a third embodiment of the fastening arrangement;
• 5 a partial schematic side view of the third embodiment of the fastening arrangement;
• 6 a partial schematic and sectional perspective view of the third embodiment of the fastening arrangement;
• 7 a detail of a schematic longitudinal sectional view of a fourth embodiment of the fastening arrangement;
• 8th a partial schematic and sectional perspective view of the fourth embodiment; and
• 9 a detail of a schematic longitudinal sectional view of a fifth embodiment of the fastening arrangement;
• 10 a partial schematic and sectional perspective view of the fifth embodiment;
• 11 a schematic longitudinal sectional view of a sixth embodiment of the fastening arrangement;
• 12 a detail of a schematic longitudinal sectional view of a seventh embodiment of the fastening arrangement;
• 13 a detail of a schematic longitudinal sectional view of an eighth embodiment of the fastening arrangement;
• 14 a partial schematic and sectional perspective view of the eighth embodiment;
• 15 a partial schematic longitudinal sectional view of a ninth embodiment of the fastening arrangement;
• 16 a partial schematic and sectional perspective view of the ninth embodiment;
• 17 a schematic longitudinal sectional view of a tenth embodiment of the fastening arrangement;
• 18 a partial schematic and sectional perspective view of the tenth embodiment;
• 19 a partial schematic longitudinal sectional view of an eleventh embodiment of the fastening arrangement;
• 20 a schematic front view of a housing of the eleventh embodiment;
• 21 a partial schematic and sectional perspective view of the eleventh embodiment of the fastening arrangement;
• 22 a schematic longitudinal sectional view of a twelfth embodiment of the fastening arrangement; and
• 23 a schematic longitudinal sectional view of a thirteenth embodiment of the fastening arrangement.

In the figures, identical or functionally identical elements are provided with identical reference symbols.

1 shows a detail in a schematic longitudinal sectional view of a first embodiment of a fastening arrangement 10 of a laminated core 12 of a stator 14 on a housing 16 of an axial flux machine. In the fastening arrangement 10, the laminated core 12 carries at least or exactly one winding 18, 20 of the stator on or on its two axial end faces S1 and S2, which point away from each other in the axial direction of the stator 14 and thus of the axial flux machine as a whole. The respective winding 18, 20 is therefore also referred to as a stator winding. It can be seen that a respective first winding region W1 of the respective winding 18, 20 protrudes outwards from the laminated core 12 in the radial direction of the stator 14 and thus projects beyond the laminated core 12. The radial direction of the stator 14 is illustrated by a double arrow 22. In addition, it is provided that a respective second winding region W2 of the respective winding 18, 20 protrudes inward from the laminated core 12 in the radial direction of the stator 14. Thus, the respective first winding region W1 forms a respective first radially outer winding head, and the respective second winding region W2 forms a respective second radially inner winding head.

In its fully manufactured state, the axial flow machine also has a rotor which can be driven by means of the stator 14 and is thus rotatable about a machine rotation axis 23 relative to the stator 14.

Out of 1 it can be seen that the laminated core 12 has a length range L, which is arranged in the axial direction of the stator 14 and thus of the axial flux machine as a whole between the respective windings 18, 20. In other words, the winding areas W1 and W2 of the winding 18 form a first winding, and the winding areas W1 and W2 of the winding 20 form a second winding, wherein, for example, the windings 18, 20 are spaced apart from one another in the axial direction of the stator 14. The length range L1 is arranged in the axial direction of the stator 14 between the two windings 18, 20.

In order to be able to integrate the stator 14 particularly advantageously into the housing 16 and at the same time to connect the laminated core 12 particularly advantageously to the housing 16, the fastening arrangement 10 provides that the laminated core 12 is connected via at least one connecting element 24 which is formed separately from the laminated core 12 and separately from the housing 16 and is connected to the housing 16, which is connected in particular to an inner peripheral surface 26 of the housing 16 facing the stator 14. The connecting element 24 is also connected to the length region L, in particular to an outer peripheral surface 28 of the laminated core 12 provided in the length region L, wherein the outer peripheral surface 28 faces the inner peripheral surface 26 in the radial direction of the stator 14 or the axial flow machine. In particular, the connecting element 24 is connected to the peripheral surface 28. It can be seen that, for example, the stator 14 and the housing 16 form a stator assembly (stator assembly) in which the connecting element 24 is connected both to the housing 16 and to the laminated core 12, so that the laminated core 12 is connected to the housing 16 via the connecting element 24.

2 and 3 show a second embodiment of the fastening arrangement 10. For example, in the second embodiment, a force-fitting connection is provided between the connecting element 24 and the laminated core 12 and/or between the housing 16 and the connecting element 24.

Particularly good looking 3 It can be seen that the laminated core 12 has, on or on its axial end faces S1 and S2, respective recesses 30 designed as grooves, in which at least respective partial regions of the windings 18 and 20 are accommodated.

4 to 6 show a third embodiment of the fastening arrangement 10. For example, in the third embodiment, the connecting element 24 is non-positively connected to the housing 16 and/or to the length region L and thus to the laminated core 12.

7 and 8th show a fourth embodiment of the fastening arrangement 10. In the fourth embodiment, for example, the connecting element 24 is positively connected to the laminated core 12, in the present case for example via at least one tooth 32, which for example engages in a corresponding tooth gap 34 of the laminated core 12. Thus, for example, the tooth 32 is provided on the connecting element 24.

9 and 10 show a fifth embodiment of the fastening arrangement 10. In the fifth embodiment, for example, the connecting element 24 is positively and/or force-fittedly connected to the laminated core 12. In this case, For example, the connection is designed to be positively connected via a tooth 32 and a tooth gap 34 and is also and/or additionally designed to be non-positively connected by an L-shape of the connecting element 24. The L-shape can be used to transmit a force, in particular a contact force, between a housing 16 and a laminated core 12 of the stator 14. The shape of the connecting element 24 can also advantageously improve positional tolerances of the stator 14 in relation to the housing 16.

11 shows a sixth embodiment which, due to a special L-shape of the connecting element 24, has a high contact surface between the connecting element 24 and a laminated core 12 of the stator 14, which is advantageous for a force-fitting connection and can also compensate for shape and position tolerances. Due to the special L-shape with a bend, both the high contact surface can be achieved and an axial distance from the connecting element 24 to the winding areas W1 can be large, in particular in contrast to the fourth embodiment of the fastening arrangement 10 from 7 . This makes it easier to maintain electrical insulation distances between the connecting element 24 and the winding areas W1. The bend in the L-shape can also increase the rigidity in the axial direction.

12 shows a seventh embodiment with a high contact surface between the connecting element 24 and a laminated core 12 of the stator 14 and thus a wide connection area, whereby the connecting element 24 has a T-shape. The connecting element 24 has the same distance from the two windings 18, 20 on both sides.

In the 13 and 14 an eighth embodiment of the fastening arrangement 10 is shown, wherein here the connecting element 24 is positively connected to the laminated core 12, for example, as in particular in the sixth and seventh embodiments of the connecting element 24.

15 and 16 show a ninth embodiment of the fastening arrangement 10. In the ninth embodiment, the connecting element 24 is positively connected to the laminated core 12 by means of at least one additional connecting element 35 formed separately from the laminated core 12 and separately from the housing 16 and separately from the connecting element 24, wherein the connecting element 35 is, for example, a pin. In the present case, this is done in such a way that the connecting element 35 partially engages in the connecting element 24 and partially in the laminated core 12, so that the connecting element 35 is in turn positively connected to the connecting element 24 on the one hand and positively connected to the laminated core 12 on the other. As a result, the connecting element 24 is positively connected to the laminated core 12 by means of the connecting element 35, and is therefore connected to the laminated core 12.

The connecting element 35 can also be designed, for example, as a pin connection and/or polygon connection or alternatively as a welded connection, in which the connecting element 35 is made flush with the laminated core 12 and the connecting element 24 by a welding process. In particular, in an alternative embodiment not shown, the connection between the connecting element 24 and the laminated core 12 can then be made completely cohesive, in which the connecting element 24 is welded to the laminated core 12 at least via a welding point by a welding process.

Advantageously, the connecting elements 35 or alternatively the welding points are arranged in the circumferential direction in the region of the slots of the laminated core 12, since in the wound and energized stator 14 the lowest electromagnetic flux prevails in the circumferential direction in the region of the slots and thus the windings 18, 20 and thus the connecting elements 35 or welding points do not mean any significant additional losses in the electromagnetic flux and are therefore uncritical.

Advantageously, the connecting elements 35 can also be inserted or plugged in from the outside, so that the connecting element 24 can be arranged first and then at least one, advantageously several connecting elements 35 can be inserted and thus the connecting element 24 can be connected to the laminated core 12 via the connecting elements 35.

17 and 18 show a tenth embodiment of the fastening arrangement 10. 18 it can be seen that several connecting elements 24 are provided, via which the laminated core 12 is connected to the housing 16. In the tenth embodiment, the respective connecting element 24 is a respective spoke, which extends, for example, in a straight line in the radial direction of the stator 14 and thus of the axial flow machine. In particular, the respective spoke is positively connected to the laminated core 12, in particular in such a way that the respective spoke partially engages in the laminated core 12.

Finally, 19 to 21 an eleventh embodiment of the fastening arrangement 10. In the eleventh embodiment, the connecting element 24 is also, for example, positively connected to the length range L and thus connected to the laminated core 12.

For this purpose, the length range L, in particular the outer peripheral surface 28 of the laminated core 12, has a non-circular shape, in particular a polygonal or polygon-shaped profile. In other words, for example, the length range L, in particular the outer peripheral surface 28, has a polygonal shape, thus the shape of a polygon. As in 20 shown, the connecting element 24, in particular an inner peripheral surface 36 of the connecting element 24 facing the peripheral surface 28, is also non-circular and thus polygonal, in particular such that an inner peripheral shape of the connecting element 24, in particular of the peripheral surface 36, is adapted to an outer peripheral shape of the length region L, in particular of the peripheral surface 28.

Analogously, something similar and thus a circumferential polygonal shape can be transferred to the connecting element 24 and the housing 16. For example, the housing 16, in particular the outer surface 26, has a third shape, and the connecting element 24, in particular an outer peripheral surface 38 of the connecting element 24 facing the outer surface 26, has, for example, a fourth shape which is adapted to the third shape, for example. The third shape and the fourth shape are non-circular and in particular polygonal, so that a positive connection is preferably provided between the housing 16 and the connecting element 24. The non-circular and in this case polygonal shape of the housing 16, in particular of the inner peripheral surface 26, can be designed symmetrically, as with the outer peripheral surface 28 of the laminated core 12, in order to simplify handling here or in particular asymmetrically in order to specify a preferred direction during assembly.

The respective design of the respective lateral surface 28, 36 in polygonal form can be particularly well 21 be recognized.

For example, the laminated core 12 of the stator 14 can be wound and shaped non-circularly during production so that it has a non-circular outer peripheral surface 28 or this shape can only be produced in a further processing step.

If, for example, the connecting element 24 has both a non-circular, in particular polygonal, outer peripheral surface 38 and an inner peripheral surface 36, a positive connection for torque transmission can be realized, whereby a radial pressure on the stator can be reduced.

Such a connection via the connecting element 24 means that no further securing in the radial and circumferential direction is required, which represents a cost-effective solution. The options shown in the other embodiments for a positive and/or non-positive connection in the axial direction thus make it possible to create a fastening arrangement 10 in all directions.

In addition, it is also possible for the connecting element 24 to be made in several parts, for example, which can in particular also be divided at least partially in the circumferential direction. In particular, several connecting elements 24 can also contribute to the fastening arrangement 10, so that one sheet is fastened as connecting elements 24 from the left in the axial direction and another sheet is fastened as connecting elements 24 from the right in the axial direction. This makes it possible to achieve the greatest possible coverage for the shape and position tolerances, and to achieve the highest possible rigidity of the stator 14.

If several connecting elements 24, in particular two connecting elements 24, are provided for the fastening arrangement 10, embodiments as in 22 as a twelfth embodiment of the fastening arrangement 10 or as in 23 as a thirteenth embodiment of the fastening arrangement 10. Here, two connecting elements 24 are provided next to one another in the axial direction, with a cavity 40 being formed between the two connecting elements 24, which can be used for cooling and/or fluid guidance. In particular, the connecting elements 24 essentially enclose the laminated core 12 of the stator 14 in the circumferential direction, so that a circumferential cooling channel is formed. For this purpose, the cavity 40 is arranged at least between the two connecting elements 24 in the radial inner region on the laminated core 12 in order to form the cooling channel with the laminated core 12 as one boundary side and thus enable good heat exchange between the laminated core 12 and the cooling fluid in the circumferential cavity 40 as the cooling channel. The cooling fluid can, as is known, be oil, water or a water mixture.

In the twelfth embodiment of the 22 It can be seen that the connecting elements 24 have a substantially flat side surface and are therefore arranged at a distance from one another in the axial direction in order to form a cavity 40 over essentially the entire radial extent of the connecting elements 24 due to the distance between the two connecting elements 24. Here, the cavity 40 is delimited in the radial direction by both the laminated core 12 and the housing 16 and can thus be fluidically coupled both from the outside via the housing 16 and from the inside via the laminated core 12. In the twelfth embodiment, for example, a through-opening or bore in the laminated core 12 and/or the housing 16 can be used as a cooling channel to flood the cavity 40 and thus serve as an inflow or outflow.

In the thirteenth embodiment of the 23 it is evident that the two connecting elements 24 have a step in the radial direction, so that they touch in the radially outer region and are nevertheless spaced apart from one another in the axial direction in the radially inner region, and thus a cavity 40 is formed between the two connecting elements 24 in the radially inner region. The cavity 40 is delimited both by the two connecting elements 24 and in the radial direction by the laminated core 12. The cavity 40 can thus be fluidically coupled primarily from the inside via the laminated core 12. In the thirteenth embodiment, for example, a through-opening or bore in the laminated core 12 can be used as a cooling channel to flood the cavity 40 and thus serve as an inflow or outflow.

In a variation of the thirteenth embodiment of the fastening arrangement 10, instead of two connecting elements 24, a one-piece connecting element 24 can be used, which essentially has a Y-shape, so that its foot points radially outwards and the fork area is arranged radially inward on the laminated core 12. The interior of the fork area of the Y-shaped connecting element 24 then forms the cavity 40 again together with the laminated core 12. Such shapes can also be easily produced, for example, as a cast component, in particular by an injection molding process.

Alternatively, in the twelfth and thirteenth embodiments, for example, several inflows or outflows are also possible in order to improve the flooding of the cavity 40 as a cooling channel. It would also be possible for the cavity 40 not to completely enclose the laminated core 12 in the circumferential direction or for several blockages to be arranged in the cavity 40 in the circumferential direction, thus forming several, in particular at least partially separate, cooling channels, which then also have their own inflows and outflows.

In a further alternative embodiment not shown, the connecting element 24 is designed such that it can be pushed onto the laminated core 12 from the outside in the axial direction. For this purpose, the contact surface of the connecting element 24 on the laminated core 12 cannot be continuous in the circumferential direction, but must be toothed in such a way that these teeth engage between the windings 18, 20 in the circumferential direction and can thus fasten the laminated core 12 via the connecting element 24.

List of reference symbols

10

Mounting arrangement

12

Sheet metal package

14

stator

16

Housing

18

Winding

20

Winding

22

Double arrow

23

Machine rotation axis

24

Connecting element

26

inner circumferential surface

28

outer peripheral surface

30

Recesses

32

Tooth

34

Tooth gap

35

Connecting element

36

inner circumferential surface

38

outer peripheral surface

40

cavity

L

Length range

S1

axial face

S2

axial face

W1

Winding range

W2

Winding range

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely to provide the reader with better information. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 102019125871 A1 [0002]
• DE 102021124998 A1 [0002]
• EP 3245718 A1 [0002]
• US 20170117763 A1 [0002]

Claims (12)

Fastening arrangement (10) of a laminated core (12) of a stator (14) to a housing (16) of an axial flux machine, in which the laminated core (12) carries at least one winding (18, 20) of the stator (14) on each of its two axial end faces (S1, S2), wherein the laminated core (12) is fastened to the housing (16) via at least one connecting element (24) which is formed separately from the laminated core (12) and separately from the housing (16) and is connected to the housing (16), which is connected to a longitudinal region (L) of the laminated core (12) and thereby to the laminated core (12), the longitudinal region (L) of which is arranged in the axial direction of the stator (14) between respective winding regions (W1) of the windings (18, 20) which protrude outwards from the laminated core (12) in the radial direction (22) of the stator (14). Fastening arrangement (10) according to Claim 1 , characterized in that the connecting element (24) is formed from at least one metallic material, in particular aluminum and/or steel and/or sheet metal, and/or from at least one fiber-reinforced plastic, in particular glass fiber-reinforced plastic and/or carbon fiber-reinforced plastic. Fastening arrangement (10) according to Claim 1 or 2 , characterized in that the connecting element (24) has a plurality of plates which are formed separately from one another and connected to one another. Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) is deformed. Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) is designed as a cast component or injection-molded component. Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) has at least one substantially circumferential cavity (40) or several cavities (40) in the circumferential direction, which at least partially enclose the laminated core (12), so that the at least one cavity (40) can be used to cool the laminated core (12). Fastening arrangement (10) according to Claim 6 , characterized in that the connecting element (24) is formed in several parts and the cavity (40) is formed between the several parts of the connecting element (24). Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) has at least one through-opening which is continuous in the axial direction of the stator (14). Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) is completely spaced from the windings (18, 20). Fastening arrangement (10) according to one of the preceding claims, characterized in that the connecting element (24) has an electrically insulating coating. Axial flow machine, with at least one fastening arrangement (10) according to one of the preceding claims. Motor vehicle, with at least one axial flow machine according to Claim 11 .

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