ELECTRIC MOTOR FOR A VEHICLE WHEEL

Abstract

Electric motor for a vehicle wheel, in particular wheel hub motor, comprising - a stator (2) with a stator lamination stack (3), comprising a stator ring (4) with radially arranged stator teeth (5) for an electrical winding (6), - a stator support (7), wherein the stator (2) is arranged on the stator support (7) and wherein the stator support (7) has a hub (8) through which a shaft (9) is received, - a rotor (10) formed from a plurality of permanent magnets (12) enclosed by a flux ring (11), wherein the flux ring (11) is enclosed within a rim (13) of a vehicle, - at least two covers (14a, 14b) that close the electric motor (1), wherein at least one insulating ring (15) is arranged on the axial end faces of the stator lamination stack (3), wherein the at least one insulating ring (15) has a radial projection (16) that encompasses the stator lamination stack (3) and the stator support (7).

Description

[0001] The invention relates to an electric motor for a vehicle wheel according to claim 1.

[0002] It is common practice to install electric motors in or on the wheels or tires of vehicles to drive them directly. This has the advantage of space-saving installation in or on the wheel and eliminates the need for a complex drive train with gears and shafts. The efficiency of the drive also increases due to the direct connection to the vehicle wheel. Such electric motors can be used, particularly in the form of wheel hub drives, for electrically powered vehicles, such as electric scooters or electric bicycles. These combine high mobility, especially in urban traffic, with zero CO2 emissions during locomotion.

[0003] Such electric motors typically feature a stator mounted within a rim on a shaft connected to the vehicle or vehicle wheel. This is usually the vehicle's rear wheel. The stator may be surrounded by a rotor that rotates around it and may be housed in the vehicle rim. The torque generated by the rotational movement through the interaction between the two magnetic fields is used to drive the vehicle wheel. An additional gearbox is not required. Commutation between the stator and rotor is electronic, with the (control) electronics for this usually located in the vehicle.

[0004] DE 601 07 384 T2 relates to a wheel with an electric drive device arranged therein and to a method for coordinating the number of revolutions of at least two wheels mounted on a vehicle. Furthermore, the invention relates to a wheel strut with fastening means for attaching the wheel strut to a vehicle and fastening means for attaching a wheel to the wheel strut. These fastening means are rotatable about the longitudinal axis, and the wheel strut is equipped with drive means for rotating the fastening means. A wheel equipped with such a wheel strut is included.

[0005] EP 3 687 046 A1 describes a braking device for a wheel hub motor and a wheel hub motor comprising this device. The braking device consists of a brake drum part that is fastened to a surface of the rim of a wheel hub motor and has at least one hole. Furthermore, there is at least one driver that is installed radially inside the brake drum part and serves to push or pull a pin, which can be inserted into the hole, into or out of the hole in accordance with a braking signal from the wheel hub motor. The brake drum part comprises a disc body with a hollow opening and an outer wall, wherein a shaft of the wheel hub motor extends through the hollow opening and the outer wall is fastened to the rim. A circumferential bulge protrudes at a certain distance from the disc body toward the rim and has the hole in the circumferential bulge.When a brake signal is input, a braking force is quickly applied to the wheel hub motor. This braking force is maintained constant even if the power supply is interrupted on an inclined road.

[0006] CN 2 08 316 424 U describes a wheel hub motor for electric vehicles with a stator assembly and a rotor assembly.

[0007] CN 2 05 960 817 U describes a wheel hub motor for electric cars, comprising a stator, a rotor and a connecting shaft.

[0008] Since the entire motor assembly is housed within a vehicle wheel, the challenge is to make the electric motor as compact as possible while maintaining a simple design. This ensures straightforward installation within the vehicle or wheel, with the option of (electrical) connection to the rest of the vehicle. At the same time, the highest possible drive efficiency must be ensured while protecting the components from environmental influences.

[0009] This object is achieved by an electric motor for a vehicle wheel according to claim 1.

[0010] An electric motor for a vehicle wheel, in particular a wheel hub motor, comprises - a stator with a stator core, comprising a stator ring with radially arranged stator teeth for an electrical winding, - a stator carrier, wherein the stator is arranged on the stator carrier and wherein the stator carrier has a hub through which a shaft is received, - a rotor formed from a plurality of permanent magnets enclosed by a flux ring, the flux ring being enclosed within a rim of a vehicle, - at least two covers which close the electric motor, wherein at least one insulating ring is arranged on the axial end faces of the stator laminated core, wherein the at least one insulating ring has a radial projection which encompasses the stator laminated core and the stator carrier, wherein a printed circuit board is arranged on the at least one insulating ring on at least one axial end face, wherein at least one Hall sensor is in contact with the printed circuit board and is accommodated within receptacles in the stator teeth.

[0011] The present motor type is preferably a BLDC motor, and in particular a motor with an external rotor principle. The stator, which is permanently mounted on a hub with a supported (stationary) shaft, is surrounded by a rotor with permanent magnets, which in turn is connected to the rim. More precisely, a flux ring, a metal ring with high permeability, holds the rotor or forms a unit with it. The permanent magnets are preferably glued to the flux ring. The flux ring, in turn, is connected to the rim or the cover(s), preferably by welding. However, other possible force-fitting, form-fitting, or material-fit connections between the flux ring and the vehicle rim are also conceivable.

[0012] The stator carrier comprises the stator, which is formed from a stamped package and accommodates an electrical winding via stator teeth arranged radially on the stator ring. The general structure of the stator is well known from the prior art and requires no in-depth explanation. The stator carrier can be made of metal such as steel or aluminum and ensures a stable and robust mount for the stator, which holds the stator in position even when the vehicle wheel moves. The shaft, which is held by the hub of the stator carrier, is a fixed shaft. Unlike an axle, it does not rotate but still transmits torque from the stator to the vehicle mount. The stator is stationary and is revolved by the rotor. A suitable winding surface A1 is formed between the radially arranged stator teeth, which enables the winding of the individual stator teeth.A stator tooth surface A2 defines the size of the stator tooth in terms of its length and width. An example winding of the stator teeth is given with an area ratio of the winding surface A1 to the stator tooth surface A2 in the range of 0.5 to 1.1.

[0013] The covers (also known as bearing shields) protect the electric motor from environmental influences and simultaneously ensure sufficient cooling or heat dissipation. At the same time, they can advantageously be designed to transfer the forces of the rim (via bearings) to the shaft. The covers can be made from a wide variety of materials, metals or plastics, which are known and common in vehicle construction. The covers are preferably each made of several parts, in particular consisting of two separate parts or covers. In principle, however, it is conceivable to provide a one-piece cover or one that is permanently connected during assembly (or several covers). It is also conceivable that the rim can also be made of several parts, if necessary or desired. The covers can have a hole for an exhaust valve if a tubeless wheel or wheel with a tube tire is used.However, this hole is usually formed directly in the rim. An O-ring may be provided in at least one cover to achieve a favorable seal. The covers can preferably be completely closed. A device for attaching a brake, such as a disc or drum brake, can also be attached to one of the covers.

[0014] Preferably, a (one-piece) insulating ring is arranged at the transition between the stator and the stator support on one or both axial end faces. This insulating ring has a radial projection provided on one or both sides of the insulating ring, which surrounds the stator, more precisely the stator laminated core, in particular by claws or is attached in a flat or flat manner to it. It is conceivable to provide an air gap between the projection and the stator. The insulating ring can have grooves that advantageously support cooling.

[0015] The electric motor is preferably a wheel hub motor, but other direct drives are also conceivable, especially in so-called two-wheel drive vehicles. In this case, not just one wheel (preferably the rear wheel on two-wheelers) is driven, but two wheels, i.e., the front and rear. This can also be provided for multi-track vehicles with drive to two rear wheels, or alternatively, to the front wheels.

[0016] The electric motor is preferably used in vehicle wheels with tubeless tires. However, wheels with air (or other gas)-filled tubes or tube tires are also conceivable.

[0017] The advantage of this design is the compactness of the motor assembly, which allows it to be easily housed within a vehicle wheel to drive it. Uncomplicated assembly is also advantageously enabled. The highest possible drive efficiency is ensured, particularly through the installation of the circuit board and the inclusion of the Hall sensors.

[0018] The motor arrangement can also comprise several shims, preferably three shims, in order to keep the axial play of the stator on the shaft to a minimum.

[0019] The circuit board is a standard PCB (printed circuit board) and includes several relevant electronic components such as temperature sensors and / or interference suppression components (ESD) and / or the Hall sensor(s). The Hall sensors are accommodated in particular in a receptacle of a stator tooth or in a receptacle of the insulating ring. This ensures safe and efficient use of the Hall sensors on the stator with stable and captive fastening, even in the event of major vibrations from the vehicle wheel. In particular, the circuit board is arranged on an axial end face of the insulating ring. In principle, fastening the circuit board at another location on the stator is also conceivable. Provision can be made for at least one further circuit board, for example, on the other side of the stator carrier. The electronic contact to the Hall sensors and / or temperature sensors of the electric motor is preferably realized via the circuit board.

[0020] According to one embodiment, at least one elongated hole and at least one pin on the at least one insulating ring are formed on the circuit board for centering, fixing, and aligning the circuit board. This enables assembly-friendly positioning of the circuit board while ensuring secure hold even after assembly. A elongated hole can be understood as an opening or bore provided for radial tolerance compensation. At least one pin can be formed integrally from the insulating ring or applied separately and correspond to corresponding recesses in the circuit board. This type of circuit board fixing offers the advantage of one-piece, rotationally symmetrical mounting on a fully populated circuit board. Furthermore, the circuit board fixing does not place any stress on the pins of the Hall sensors and cable connections.Alternatively, the circuit board can be connected to the insulating ring using hot-staking, for example. A screw connection is also possible. In addition to the pin for fixing, a screw connection can also be provided between the circuit board and the insulating ring and / or stator.

[0021] In an alternative design, at least one elongated hole and at least one pin on at least one holder are formed on the circuit board for centering, fixing, and aligning the circuit board. This enables assembly-friendly positioning of the circuit board while ensuring secure hold even after assembly. A elongated hole can be understood as an opening or bore provided for radial tolerance compensation. At least one pin can be formed integrally from the holder or applied separately and correspond to corresponding recesses in the circuit board. This type of circuit board fixing offers the advantage of one-piece, rotationally symmetrical assembly with a fully populated circuit board. Furthermore, the circuit board fixing does not place any stress on the pins of the Hall sensors and cable connections. Alternatively, the circuit board can be connected to the holder, for example by hot caulking.A screw connection is also possible. In addition to the pin for fixing, a screw connection can also be provided between the circuit board and the holder and / or stator. The holder is attached to the stator carrier for ease of installation.

[0022] According to a further embodiment, at least one of the covers is attached to the flux ring. One cover can be permanently or reversibly attached to the flux ring, or both covers can be. Preferably, at least one cover is screwed to the flux ring. This allows for a repair-friendly design, as the screws can be subsequently loosened (unlike a permanently welded design) and the electric motor (which is still screwed on) does not have to be disassembled, while the rim can be replaced in the event of damage. The screw connection on the flux ring can be screwed to the covers independently of the rim. The holes for the screw connection in the flux ring are preferably provided on the inner circumference or on the axial end face(s) above the permanent magnets.

[0023] It can also be provided that at least one of the covers is fastened in or to the rim. One cover can be permanently or reversibly attached to the rim, but also both covers. This is not mandatory, however; it is also possible not to fasten either cover to the rim. This also allows for a repair-friendly design, as the screws can be loosened later (unlike a permanently welded design) and the electric motor (which is still screwed on) does not have to be disassembled, while the rim can be replaced in the event of damage. The rim can advantageously be replaced separately from the motor, for example in the event of damage. The motor does not have to be disassembled separately.

[0024] The covers can be screwed to the flux ring and / or rim on one or both sides, even independently of each other. Other detachable connection types are also conceivable. The holes on the covers for the screw connection are preferably located on the outer circumference or the axial end faces of the covers. The rim can be conveniently replaced separately from the motor, for example, in case of damage. The motor does not need to be disassembled.

[0025] It can be provided that at least one cover is flush with the edge of the rim in the radial direction, but the other cover on the opposite side has a star-shaped, wave-shaped or similar shape in the radial direction.

[0026] It can further be provided that two sub-carriers are connected to the stator carrier via at least one pipe socket, and that the two sub-carriers each have an axially outward- or inward-facing curvature with a through-opening for the shaft in their center. Viewed radially, the outward-facing curvature represents a protrusion or accumulation of material on the stator carrier. The stator carrier can be formed from several parts, with the individual parts (usually two separate parts) being connected to one another by means of pipe sockets, but also by means of screws, bolts, pins or rivets. Material-to-material connections are also conceivable. In particular, however, riveted connections are advantageously suitable for connecting one or more areas of the stator carrier or its separate parts to one another. The curvature preferably has an inward- or outward-facing flange. The shaft and / or a bearing bush can be supported on this.

[0027] Advantageously, the hub is formed in the through-hole and a bearing bush is arranged in the through-hole. The bearing bush can be pressed in, glued in, or similarly secured. Preferably, the bearing bush is welded on both sides. Knurls can be provided on the shaft to support a positive connection between the bearing bush and the shaft during pressing. The shaft is pressed in and / or connected to the stator carrier via a positive connection (e.g., key, spline connection).

[0028] Furthermore, the electrical winding is advantageously formed from at least one winding wire, wherein individual phase wires are contacted with the electrical winding and connected to form a connecting line. Alternatively, the electrical winding can also be formed from several winding wires (multi-wire) or from a single-wire winding. The electrical winding can be wound continuously. The connection can be realized by a star-parallel winding, star-series winding, delta-series winding, or delta-parallel winding, delta-semi-parallel winding, delta-series connection, delta-double-parallel connection, or a delta-quadruple-parallel connection. The electrical winding is soldered to a plurality of phase wires, which in turn can be connected to the connecting line. The connecting line has insulating sleeves and in particular comprises the phase wires within its insulating line(s).One or more temperature sensors can be mounted on the electrical winding.

[0029] Preferably, the shaft can be provided with at least one transverse bore through which the connecting cable is routed. The connecting cable then leads outside the electric motor. This allows for compact and efficient routing of the connecting cable without the risk of damaging the connecting cable or the need to create additional installation space for the routing. In addition to the transverse bore, further bores can be provided, for example, a metering bore into which sealing material can be introduced. For example, to seal the feedthrough for the connecting cable. However, a sealing grommet could also be used in addition to or as an alternative to the liquid sealant.

[0030] In an alternative design, a sleeve is mounted on the shaft through which the connecting cable is routed. This has the advantage that the connecting cable does not have to be routed through a cross-bore in the shaft. Furthermore, sealing is easier. The sleeve is mounted between the bearing and the shaft. An axial bore is provided in the sleeve through which the connecting cable is routed in a rubber grommet parallel to the shaft through the sleeve. The bearing, together with the sleeve and a radial shaft seal, is housed in a bearing shield.

[0031] Furthermore, it can preferably be provided that at least one electrical insulation is arranged in the stator ring between the individual stator teeth. This can be, for example, a plastic or foil insulation, but preferably a paper insulation.

[0032] According to one embodiment, at least one bearing is arranged on the shaft or in the covers at a distance from the stator carrier. This preferably involves one or two ball bearings, which are preferably supported on one or both sides of the cover.

[0033] According to one design, the flux ring has a chamfer and accommodates at least one O-ring. This is advantageous for ease of repair, as the rim can be removed for repairs or inspections of the engine. The O-ring ensures internal sealing without the need for a liquid sealant.

[0034] According to another design, the stator support is adapted to the axial length of the stator core. This allows the stator support to be optimally adapted to the respective stator core. However, it is also possible to adapt the stator support to the width of the stator core.

[0035] In particular, the stator lamination stack can be formed by stamping individual laminations or a continuous stator chain. In stamping, individual and loose (steel) laminations are formed into a lamination stack. However, a continuous and uninterrupted stator chain made of continuous sheet metal strips is also possible. This has the advantage of minimal waste during production.

[0036] The electric motor according to the invention can be incorporated into a vehicle wheel. In particular, the electric motor can be connected in or to the rim, whereby the rim can be attached in or to the vehicle wheel. It is possible to provide the rear wheel of a two-wheeled vehicle with the electric motor, or two rear wheels of a motor vehicle. It is also possible to provide the front and rear wheels, or both front and rear wheels, with the electric motor simultaneously, even in multi-track vehicles.

[0037] In particular, the vehicle wheel is comprised of a vehicle, in particular a scooter or a bicycle, preferably electrically powered, such as e-scooters, e-rollers, e-bikes, pedelecs, cargo bikes, three- or four-wheeled or multi-track vehicles and a multitude of fields of application obvious to the person skilled in the art.

[0038] The features and advantages of the electric motor of the present invention are explained in more detail below using exemplary embodiments with reference to the drawings. Fig. 1 an exemplary overview of an electric motor according to an embodiment, Fig. 2 a sectional view of an electric motor according to Fig. 1, Fig. 3 a detailed view of a stator, Fig. 4 a further detailed view of a stator; Fig. 5 to Fig. 7 detailed representations of embodiments; Fig. 8 a sectional view of the shaft without cross hole with the sleeve.

[0039] In the Fig. 1 shows an electric motor (1) for a vehicle, for example an e-scooter, in an assembled form according to one embodiment. In particular, it is a wheel hub motor. It can be seen that a cover (14a) is screwed to a flux ring (11) via several screws (34). However, this is not mandatory. The cover can also be attached in other ways, such as clipped or even welded. The flux ring (11) is in turn attached, for example welded, to a rim (13) of the vehicle. The cover (14a) has an opening through which a shaft (9) is guided. The shaft (9) can in turn be connected to the rest of the vehicle, for example via a fork or swing arm (not shown). The cover (14a) is flush with the edge of the rim (13) in the radial direction, but the end can also have a star-shaped, wave-shaped, or similar shape in the radial direction.

[0040] A connecting cable (29) is guided through the shaft (9) and is in electrical connection with the vehicle or the motor control.

[0041] The Fig. 2 is a sectional view of an electric motor (1) according to Fig. 1, wherein all relevant elements of the electric motor (1) are visible. In the exemplary embodiment, the electric motor is mounted within the rim (13) and comprises a rotor (10) and a stator (2). The rotor (10) is formed by permanent magnets (12) which are held by a flux ring (11), for example by being glued into or onto the flux ring (11). The flux ring (11) preferably consists of a metallic, permeable material and can, according to one exemplary embodiment, be welded into the rim (13). In this example, the covers (14a, 14b) are screwed to the flux ring (11) using screws (34). However, other fastening options are also conceivable, as in the Fig. 5 to Fig. 7 shown in more detail.

[0042] The stator (2) is, like the Fig. 3, formed from a stamped laminated core (3). The stamped laminated core (3) itself forms a stator ring (4) with stator teeth (5) for receiving an electrical winding (6). The stator (2) is held by a stator carrier (7), which is preferably formed from sub-carriers (22). For example, the sub-carriers (22) are flanged together inwards or outwards by means of a pipe socket (23). Connections via rivets or bolts are also conceivable. The stator carrier (7) has radial projections (16) which extend around the stator on one or both sides (on the axial end face (33) in each case) and engage or claw around it. An air gap between the radial projection (16) and the stamped laminated core (2) is conceivable.

[0043] The shaft (9) is guided through a hub (8) of a through-hole (26), wherein a bearing bush (27) may additionally be provided. In the exemplary embodiment, ball bearings (32) are provided on both sides. The shaft (9) has at least one transverse bore (30) through which the connecting line (29), which is connected to or formed by phase wires (28), can be led outwards. The phase wires are connected to the respective phases of the electrical windings (6) of the stator and are connected, for example, within an insulation, to the connecting line (29).

[0044] According to this exemplary embodiment, the covers (14a, 14b) are each connected to the flux ring (11) at the axial end faces (33) via a screw connection (34). It is possible to subsequently loosen the screw connection (34) and remove the covers (14a, 14b). This advantageously allows for work on the electric motor (1) for maintenance or inspection.

[0045] In the Fig. 3 also shows a curvature (25), which is formed, for example, by primary shaping or an accumulation of material on the stator carrier (7).

[0046] Like the Fig. 3 and Fig. 4, a printed circuit board (17) is provided on one of the insulating rings (15) and thus on an axial end face (33). Alignment and centering are achieved via at least one pin (21) on the insulating ring (15), via a round hole (36). The printed circuit board (17) is further radially secured via an elongated hole (20) and / or a screw on the printed circuit board (17). Hall sensors (18) are contacted with the printed circuit board and accommodated within receptacles in the stator teeth (5) and fastened there securely and captively. Temperature sensors can be placed at various locations. The printed circuit board (17) is connected to the signal lines of the connecting line (29) (power supply and signals from the Hall sensors 18, as well as the temperature sensors). A suitable winding surface A1 is formed between the radially arranged stator teeth, which enables the winding of the individual stator teeth.A stator tooth surface A2 defines the size of the stator tooth in terms of its length and width. An example winding of the stator teeth is given with an area ratio of the winding surface A1 to the stator tooth surface A2 in the range of 0.5 to 1.1.

[0047] Examples include the Fig. 5 to 7 show several embodiments of how the cover(s) (14a, 14b) can be fastened.

[0048] Fig. Figure 5 shows that both covers (14a, 14b) are screwed to the flux ring (11) via the screw connection (34). For this purpose, the flux ring (11) has a threaded bore. The covers (14a, 14b) also have corresponding recesses.

[0049] Fig. Figure 6 discloses a fastening of a cover (14a, 14b) to the rim (13) and the flux ring (11), respectively, via a screw connection (34).

[0050] Fig. Figure 7 further shows a one-sided fastening of a cover (14a) in or on the flux ring (11) and additionally a fastening of the other cover (14b) in the flux ring (11) and in the rim (13). The screw connection (34) can be designed to be longer accordingly.

[0051] In all embodiments, it is conceivable that only one side, or only one cover, is screwed via the screw connection (34), while simultaneously connecting the other side firmly and / or permanently to the rim (13) and / or flux ring (11). A seal, such as an O-ring (35), can be provided between the flux ring (11) and the cover, arranged in a chamfer of the flux ring.

[0052] Fig.Figure 8 shows a sectional view of the shaft (9) without a cross-bore, with the sleeve (38) through which the connecting cable (29) is passed. The sleeve (38) is mounted between the bearing (32) and the shaft (9). The bearing (32), together with the sleeve (38) and a radial shaft seal (39), is accommodated in a bearing shield (40). An axial bore is provided in the sleeve (38) through which the connecting cable (29) is passed through the sleeve (38) in a rubber grommet parallel to the shaft (9). The shaft (9) therefore does not require a cross-bore to guide the connecting cable (29) into the interior of the motor. List of reference symbols 1 electric motor 2 Stator 3 stator lamination pack 4 Stator ring 5 stator teeth 6 electrical winding 7 Stator carrier 8 Hub 9 Wave 10 Rotor 11 Flux ring 12 permanent magnets 13 rim 14a, 14b Cover(s) 15 Insulating ring 16 radial projection 17 Circuit board 18 Hall sensor 19 recording 20 slotted holes 21 pins 22 sub-carriers 23 pipe sockets 24 sub-carriers 25 Curvature 26 passage opening 27 Bearing bush 28 phase wires 29 Connection cable 30 cross-hole 31 Electrical insulation 32 warehouses 33 Axial front side 34 screw connection 35 O-ring 36 round holes 37 holders 38 sleeve 39 Radial shaft seal 40 bearing plate A1 Changing area A2 Stator tooth surface

Claims

[1] Electric motor for a vehicle wheel, in particular a wheel hub motor, comprising - a stator (2) with a stator core (3) comprising a stator ring (4) with radially arranged stator teeth (5) for an electrical winding (6), - a stator carrier (7), wherein the stator (2) is arranged on the stator carrier (7) and wherein the stator carrier (7) has a hub (8) through which a shaft (9) is received, - a rotor (10) formed from a plurality of permanent magnets (12) enclosed by a flux ring (11), the flux ring (11) being enclosed within a rim (13) of a vehicle, - at least two covers (14a, 14b) which close the electric motor (1), wherein at least one insulating ring (15) is arranged on the axial end faces of the stator laminated core (3), wherein the at least one insulating ring (15) has a radial projection (16) which surrounds the stator laminated core (3) and the stator carrier (7), wherein a printed circuit board (17) is arranged on the at least one insulating ring (15) on at least one axial end face, wherein at least one Hall sensor (18) is in contact with the printed circuit board (17) and is accommodated within receptacles (19) in the stator teeth (5). [2] Electric motor according to claim 1, wherein at least one elongated hole (20) and at least one pin (21) are formed on the printed circuit board (17) and on the at least one insulating ring (15) for centering, fixing and aligning the printed circuit board (17). [3] Electric motor according to one of the preceding claims, wherein at least one elongated hole (20) and at least one pin (21) are formed on the circuit board (17) on at least one holder (37) for centering, fixing and aligning the circuit board (17). [4] Electric motor according to claim 1, wherein at least one of the covers (14a, 14b) is attached to the flux ring (11). [5] Electric motor according to one of the preceding claims, wherein at least one of the covers (14a, 14b) is fastened in or on the rim (13). [6] Electric motor according to one of the preceding claims, wherein two sub-carriers (22) are connected to the stator carrier (6) via at least one pipe socket (23) and wherein the two sub-carriers (24) each have an axially outwardly directed curvature (25) with a through-opening (26) for the shaft (9) in their center and / or wherein the curvature (25) has an inwardly or outwardly directed flanging. [7] Electric motor according to one of claims 1 to 4, wherein two partial supports (24) are connected to the stator support (7) via at least one rivet and wherein the two partial supports (24) each have an axially outwardly directed curvature (25) with a through opening (26) for the shaft (9) in their center. [8] Electric motor according to claim 4 or 5, wherein the hub (8) is formed in the through-opening (26) and a bearing bush (27) is arranged in the through-opening (26). [9] Electric motor according to one of the preceding claims, wherein the electrical winding (6) is formed from at least one winding wire, wherein individual phase wires (28) are contacted with the electrical winding (6) and connected to a connecting line (29). [10] Electric motor according to one of the preceding claims, wherein the shaft (9) has a transverse bore (30) through which the connecting line (29) is passed. [11] Electric motor according to one of the preceding claims, wherein a sleeve (38) is mounted on the shaft (9) without a transverse bore (30) and through which the connecting cable (29) is passed. [12] Electric motor according to one of the preceding claims, wherein at least one electrical insulation (31) is arranged in the stator ring (4) between the individual stator teeth (5). [13] Electric motor according to claim 2 or 3 or one of the preceding claims, wherein the flux ring (11) has a chamfer and accommodates at least one O-ring. [14] Electric motor according to one of the preceding claims, wherein the stator laminated core (3) is formed by stamping individual sheets or a continuous stator chain.

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