Electric machine with eddy current brake

Abstract

The invention relates to an electric machine (24) having an eddy current brake (22) in an electrically driven vehicle (10), the eddy current brake (22) comprising a stator (64, 144), which has a number of coils (56) that can be energized and which is opposite a rotor (54, 96), which is connected to a shaft (52) in a rotationally fixed manner. According to the invention, the eddy current brake (22) comprises, integrated therein, a parking brake mechanism (70) comprising an electromechanical actuator (74) generating an actuating force (72) Fakt, which continues to be maintained when the electrically driven vehicle (10) is parked and locks the rotor (54, 96) in its rotational position. The invention further relates to the use of the electric machine (24), which has an eddy current brake (22) with an integrated parking brake (70), in an electrically driven vehicle (10).

Description

Technical Field

[0001] The invention relates to an electric machine with an eddy current brake in an electrically driven vehicle, wherein the eddy current brake comprises a stator having a number of coils that can be energized and lying opposite a rotor that is connected to a shaft in a rotationally fixed manner. The invention also relates to the use of the electric drive device with the eddy current brake with an integrated parking brake in an electrically driven vehicle. Background Art

[0002] The subject of DE 102020200852 A1 is a drive system, which should reduce the load of the mechanical brake to a minimum, in the manner of: generating a braking force by acting on an acting unit rotatably connected to the rotor of an electric motor along the axis of rotation through a mechanical brake and / or an eddy current brake. The acting unit can be loaded mechanically or electromagnetically by an eddy current brake and a mechanical brake in combination to generate a braking force. The activation of the eddy current brake and / or the mechanical brake is performed by a power electronic device depending on the required deceleration requirement (such as normal operation or emergency braking). The acting unit is described in the form of a drum in one embodiment and in the form of a disc in another embodiment and is not only a component of a mechanical brake but also a component of an eddy current brake. The combined use can realize a compact structural mode of the drive unit. The mechanical brake also generates a braking force when the current is interrupted or when the eddy current brake fails and can be set up to act as a parking brake or a hand brake. If a braking force is to be applied by means of a mechanical brake in the event of a power failure or a parking maneuver or at low rotational speeds of the active unit, the mechanical brake can be operated particularly low-wear and gently.

[0003] The subject matter of DE 102019201952 A1 is a parking lock in an electric axle drive, which can be implemented by means of a magnetorheological fluid. A brake mechanism is disclosed, which has a fixed part and a rotatable part, between which a gap with a magnetorheological fluid extends. This allows a significant simplification of the design of the parking lock or a simpler generation of a parking brake function, which is distinguished on the one hand by a smaller structural space and on the other hand by a lower dead weight.

[0004] For electric vehicles, the braking process is mainly carried out in a regenerative manner by operating the electric machine in generator mode. Despite this situation, hydraulically actuated friction brakes are still installed in today's electric vehicles, just as in vehicles driven by internal combustion engines. The reason for this is, on the one hand, that the brake is in the field-weakening range of the electric machine at high speeds. This means that the braking torque of the generator is typically not enough for emergency braking or full braking at high speeds. With regard to availability, it cannot be assumed that the electric machine operating in generator mode can always apply the necessary required braking torque. Summary of the invention

[0005] According to the invention, an electric machine is proposed, which includes an eddy current brake and is installed in an electrically driven vehicle, wherein the eddy current brake includes a stator, which has a certain number of coils that can be energized and is opposite a rotor, which is connected to a shaft in a rotationally fixed manner. The eddy current brake includes a parking brake mechanism integrated therein, which includes an electromechanical actuator, which generates an actuating force that is continuously maintained when the electrically driven vehicle is parked and locks the rotor in its rotational position.

[0006] The electric machine proposed according to the invention significantly improves the management of a stationary state of an electrically driven vehicle, since the parking brake mechanism now blocks the electrically driven vehicle in the de-energized state, in which the eddy current brake has no braking effect.

[0007] In an advantageous embodiment of the electric machine proposed according to the invention, the electromechanical actuator which actuates the parking brake mechanism is designed to be self-locking or cooperates with a transmission mechanism that is designed to be self-locking.

[0008] The electric motor including the parking brake mechanism for generating the actuating force according to the present invention can be used as or

[0009] - Drum brake structure, or

[0010] -Disc brake structure, or

[0011] - a plunger structure with a built-in plunger, or

[0012] - a plunger structure with an external plunger, or

[0013] - a wedge structure with radial wedges, or

[0014] -Brake band structure

[0015] To be made.

[0016] All embodiments of the parking brake mechanism have in common that the parking brake mechanism remains effective in the de-energized state of the electrically driven vehicle, independently of the function of the eddy current brake provided in the electric vehicle. The eddy current brake represents an effective braking option in the driving operation of the electrically driven vehicle, while the parking brake mechanism integrated into the eddy current brake takes over the management of the stationary state of the electrically driven vehicle, wherein the parking brake mechanism utilizes components of the eddy current brake of the electric machine, thereby making it possible to save weight due to the multiple utilization of already existing components.

[0017] In a first advantageous embodiment variant of the parking brake mechanism, it is designed as a drum brake and is integrated into the rotor of the eddy current brake, wherein the brake pads are pressed in radial direction either against the inner circumference of the rotor or against the outer circumference of the rotor.

[0018] In a further embodiment of this embodiment variant, the brake shoe is supported in a bearing point which is connected to the housing of the eddy current brake and can be radially actuated by means of an actuator which is arranged inside the rotor.

[0019] In another advantageous embodiment of the first embodiment variant of the parking brake mechanism in the form of a drum brake, the effective surface or friction surface of the brake pad acting on the inner or outer peripheral surface is different from the effective surface of the eddy current brake, thereby distributing the friction force to surfaces that are independent of each other.

[0020] In an advantageous embodiment of a first variant embodiment of the parking brake mechanism in the form of a drum brake, the brake pads are connected to one another in an articulated manner by means of webs within the rotor of the eddy current brake and can be radially expanded by means of an actuator.

[0021] In a further advantageous second embodiment variant, the parking brake mechanism is designed as a disk brake, wherein a brake caliper is associated with the outer circumference of the enlarged rotor of the eddy current brake, the friction lining of which can be displaced in the axial direction.

[0022] In a further advantageous embodiment of this second embodiment variant of the parking brake device in the form of a disk brake, the friction lining can be pressed on both sides onto a friction ring of the outer circumference of the enlarged rotor of the eddy current brake.

[0023] In a third embodiment variant of the parking brake mechanism proposed by the present invention, the parking brake mechanism is manufactured in the form of an internal or external plunger structure, wherein either a plunger is provided that can be pressed onto the end side of the rotor in an axial press fit, or as an alternative, a plunger is provided that can be pressed onto the outer circumference of the rotor of the eddy current brake in a radial press fit.

[0024] In another advantageous fourth embodiment variant of the parking brake mechanism proposed according to the present invention, the parking brake mechanism is manufactured in the form of a wedge structure, wherein a certain number of radial wedges are provided, which, during their radial movement, press the rotor of the eddy current brake against a wedge surface constructed on the housing of the eddy current brake and fix it in this pressed position.

[0025] Finally, in a fifth advantageous embodiment variant, the parking brake mechanism is designed as a brake band design, wherein a friction band is provided which is wound around the outer radius of the rotor and can be tightened by means of an actuator. In this embodiment variant of the parking brake mechanism, the friction band is supported in the actuator which in turn is accommodated on the housing of the eddy current brake.

[0026] In another advantageous embodiment variant, an electric motor with an eddy current brake inside an electric vehicle comprises a stator, which has a certain number of coils that can be energized and is opposite a rotor, which is connected to a shaft in a rotationally fixed manner, wherein the eddy current brake comprises a parking brake mechanism integrated therein, which is designed in a movable structure so that the eddy current brake comprises a movably designed stator, which is connected to a housing of the eddy current brake in a rotationally fixed manner and is prestressed by means of a spring actuator and is pulled electromagnetically in the direction of the rotor and can be locked there.

[0027] Furthermore, in an advantageous embodiment variant of the electric motor proposed according to the invention with an integrated parking brake mechanism, it is provided that the parking brake mechanism is also manufactured in a movable manner, wherein the movable stator of the eddy current brake comprises a friction cone, the movable stator is guided in a stator guide and can be pressed onto the friction surface of the rotor of the eddy current brake by means of a spring actuator.

[0028] Furthermore, the invention relates to the use of an electric machine in an electric axle module of an electrically driven vehicle.

[0029] Advantages of the present invention

[0030] By the solution proposed by the present invention, the parking brake mechanism can be accommodated in an eddy current brake centrally integrated in the powertrain of an electrically driven vehicle in an advantageous manner. Thus, for example, a parking brake function can also be generated for such a vehicle, which replaces the conventional wheel brake, especially on the rear axle, and only has a central eddy current brake as a service brake. In addition, the parking brake is used to support the service brake in the case of low speed, especially when used together with the eddy current brake. The parking brake mechanism in its different implementation variants acts on the brake disc for the eddy current brake, which represents the rotor of the eddy current brake, and locks the brake disc in a friction-locked manner in the stopped state of the vehicle, because the eddy current brake does not play a braking role in this state of the vehicle. In addition, the parking brake mechanism proposed by the present invention can contribute to saving components or repeatedly utilizing existing components through the use of the components of the eddy current brake. In addition, the brake actuating mechanism proposed by the present invention as a parking brake is used as a friction brake in the case of low driving speed to support the service brake or as a backup for the service brake.

[0031] Another advantage of the solution proposed according to the invention is that the electric motor and the eddy current brake are usually connected to the wheels of the vehicle via a transmission (often with a high transmission ratio of more than 10). This increases the torque. As a result, the parking brake actuator can be made particularly small and cost-effective in this embodiment variant. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Embodiments of the present invention are explained in detail based on the drawings and the following description.

[0033] in:

[0034] Figure 1 shows a schematic diagram of an electrically driven vehicle, in which an eddy current brake is assigned to the electric machine and acts as a central brake on the rear axle of the vehicle topology;

[0035] Figure 2 The main components of the eddy current brake are shown;

[0036] Figure 3 and 3.1 A first embodiment variant of a parking brake mechanism is shown, which is integrated into an eddy current brake in the form of a drum brake;

[0037] Figure 4 A parking brake mechanism constructed in a disc brake structure is shown;

[0038] Figure 5 A third embodiment variant (built-in) of a parking brake mechanism in the form of a plunger structure is shown;

[0039] Figure 6 Shows that according to Figure 5 An alternative to the plunger structure of the embodiment of the present invention, wherein the parking brake mechanism is constructed in an external plunger structure;

[0040] Figure 7 Another embodiment variant of a parking brake mechanism in a wedge structure is shown;

[0041] Figure 8 and 8.1 The structure of a parking brake mechanism integrated into an eddy current brake in the form of a brake band structure is shown; and

[0042] Fig. 9 and 10 The embodiment of the parking brake mechanism proposed according to the invention is shown in the form of a movable structure, which has a movable stator. DETAILED DESCRIPTION

[0043] In the following description of embodiments of the invention, identical or similar elements are denoted by the same reference numerals, wherein a repeated description of these elements is omitted in individual cases. The figures merely schematically illustrate the subject matter of the invention.

[0044] Figure 1 The vehicle topology of an electrically driven vehicle 10 is schematically shown, whose front axle 12 has a left front wheel 14 and a right front wheel 16. A left wheel brake 18 and a right wheel brake 20 are respectively assigned to the two front wheels 14, 16.

[0045] In addition, according to Figure 1 The electrically driven vehicle 10 of the topological structure in FIG. 1 has an eddy current brake 22, which is arranged coaxially with the motor 24 and the transmission mechanism 26, for example. The parking brake mechanism 70 described below is in addition to those parking brake mechanisms that use the attraction of the coil 56 for actuation (see Fig. 9 and 10 ) can also be applied to other designs of the eddy current brake 22, for example, in its radial arrangement relative to the electric machine 24. At the output 28 of the gear mechanism 26, the gear mechanism acts on the differential wheels 32 of the differential 30, which is also called a compensating gear mechanism. The compensating gear mechanism has a first output shaft 34 and a second output shaft 36 opposite it on the side, which form a rear axle 38 and drive a left rear wheel 40 and a right rear wheel 42.

[0046] From following Figure 1 From the diagram, we can see that according to Figure 1The rear axle 38 of the electrically driven vehicle 10 of the topological structure in FIG. 1 is not provided with a service brake, but the braking on the rear axle 38 is performed by an eddy current brake 22 which acts on the motor 24 and is arranged coaxially with the motor 24. If the vehicle is stationary, the eddy current brake 22 is inactive.

[0047] Figure 2 The main components of the eddy current brake 22 are shown. Figure 2 The illustrated eddy current brake 22 in FIG. 1 comprises a stationary housing 50. A plurality of coils 56 are accommodated in the housing 50, each of which comprises a winding 58 extending around an iron core 60. The housing 50 comprises a common yoke element 62 for all coils 56. The coils 56 are opposite to a rotor 54, from which a shaft 52 branches. The shaft is usually connected to a rotor 54 as in FIG. Figure 1 The rotor 54 of the electric motor 24 shown in FIG. 6 is connected. Reference numeral 64 denotes a stator of the eddy current brake 22 .

[0048] Figure 3 and 3.1 A first embodiment variant of a parking brake mechanism 70 in the form of a drum brake structure 76 is shown. Figure 3 and 3.1 As can be seen from FIG. 1 , the parking brake mechanism 70 generates an actuating force F by means of an actuator 74. akt 72. The actuator 74 is an electromechanical actuator which is either self-locking or cooperates with a self-locking transmission mechanism and which is activated by the actuating force F akt 72 applies an actuating force to the elements of the parking brake mechanism 70 .

[0049] In accordance with Figure 3 and 3.1 In the embodiment of the parking brake mechanism 70 in the form of a drum brake structure 76, brake shoes 78 are accommodated, for example, opposite each other in the interior of the rotor 54 of the eddy current brake 22. Each brake shoe 78 is covered with a brake lining 80. The two mutually opposite semi-cylindrical brake shoes 78 are connected to each other on the one hand by a web 82 and are accommodated at a bearing point 84 on the other hand. If the actuator 74 is actuated, the two brake shoes 78 are opened, that is, displaced in the radial direction and abut against the inner circumference 88 of the rotor 54, so that the rotor is locked in the stationary state of the electrically driven vehicle 10.

[0050] As an alternative, it is possible that the brake shoe 78 is pressed onto the outer circumference 89 of the rotor 54 in an alternative construction. This embodiment variant of the drum brake construction 76 is not described in detail. Figure 3 and 3.1 As shown in the figure.

[0051] Depend on Figure 3 It can be seen that, through the actuator 74 arranged in the rotor 54, the actuating force F akt 72 acts in two directions on the brake shoe 78, which is thereby pressed onto the outer circumferential surface 88 of the rotor 54 and thereby acts in accordance with Figure 1 The schematic diagram in FIG. 2 prevents the rotation of the rotor shaft 52 of the motor 24. Thus, in the stopped state of the electrically driven vehicle 10, according to Figure 1 The illustration of generates a locked state, so that the parking state management of the electrically driven vehicle 10 can be achieved by the parking brake mechanism 70 .

[0052] from Figure 4 In the illustration of FIG. , a further second embodiment variant of the parking brake mechanism 70 proposed according to the present invention and integrated into the eddy current brake 22 can be seen in a schematic manner. In this embodiment variant, a friction ring 98 is approximately centrally located on the rotor 54 of the eddy current brake 22 in the form of a disc brake structure 90. This friction ring 98 can be arranged, for example, on an enlarged rotor 96 or also on the outer circumference of the rotor 54 according to the previous figure. The parking brake mechanism 70 in the form of a disc brake structure 90 includes a brake caliper 92 arranged on the housing 50 of the eddy current brake 22. A friction lining 94 is integrated in the brake caliper 92, which, when acting in the axial direction, reduces the actuating force F akt 72 is transmitted to the circumference of the rotor 54 or to the rotor 96 which has been enlarged in diameter.

[0053] According to the parking brake mechanism 70 integrated into the eddy current brake 22, Figure 4 The components of the eddy current brake 22 of the second embodiment variant shown in FIG. Figure 2 The components are the same.

[0054] Figure 5 and 6 A third embodiment variant of a parking brake device 70 which is integrated into the eddy current brake 22 is shown.

[0055] Figure 5 A plunger structure 100 with a built-in plunger 102 is shown. This built-in plunger is activated by an actuation force F akt 72 is pressed in the axial direction toward the end side of the rotor 54 of the eddy current brake 22. The internal plunger 102 includes a friction lining 104 on its end side, which, in the pressed state, prevents the rotation of the rotor 54 of the eddy current brake 22 under the axial pressing 108 of the internal plunger 102, so that the shaft 52, for example, according to Figure 1 The rotation of the drive shaft of the motor 24 is also prevented. In this embodiment variant, the components of the eddy current brake 22 are also combined with Figure 2 The components of the eddy current brake 22 that have already been described are identical.

[0056] Figure 6 A plunger design 110 is shown within the scope of a third embodiment variant of the parking brake device 70 which is integrated into the eddy current brake 22. Figure 6 , an external plunger 112 is provided, which is guided on the housing 50 of the eddy current brake 22 in a manner movable in the radial direction and is pressed onto the outer periphery of the rotor 54 of the eddy current brake 22 under radial pressing 116. In this case, when the external plunger 112 is radially pressed 116 onto the circumferential surface of the rotor 54, the rotation of the rotor 54 of the eddy current brake 22 is also prevented, thereby also prohibiting the rotation of the shaft 52, so that the motor 24 is locked.

[0057] Figure 7 A fourth embodiment variant of a parking brake device 70 which is integrated into the eddy current brake 22 is shown.

[0058] according to Figure 7 As shown in the figure, a radial wedge 122 that can be moved into the housing in the radial direction is provided in the housing 50 of the eddy current brake 22. Therefore, the parking brake mechanism 70 is made in a wedge structure 120. When the actuating force F is applied in the radial direction akt 72, the radial wedge 122 moves into the interior of the housing 50 and fixes the rotor 54 of the eddy current brake 22 in cooperation with the wedge surface 124 formed on the interior of the housing 50. Therefore, the rotor does not rotate, so that in this case the rotor 54 of the eddy current brake 22 is also locked and the shaft 52 can no longer rotate. Figure 7 The components of the eddy current brake 22 shown in the figure should refer to the eddy current brake 22, such as the combination of Figure 2 Same components as already described.

[0059] Depend on Figure 8 and 8.1 A fifth embodiment variant of a parking brake device 70 which is integrated into the eddy current brake 22 is known.

[0060] In a fifth embodiment variant of the parking brake mechanism 70, the latter is designed as a brake band construction 130. A friction band 132, preferably designed as a steel band or the like, is received with its ends in the actuator 74. If this actuator generates an actuating force F akt72, the end of the friction band 132 is tightened at the actuator 74, so that the rotation of the rotor 54 is blocked and the rotor is stopped by the friction band 132 surrounding it. The actuator 74 is supported at the bearing structure 134 in the housing 50 of the eddy current brake 22. Once the friction band 132 has stopped the rotor 54, the rotor is locked and thus also prevents the shaft 52, for example, Figure 1 With regard to the components of the eddy current brake 22 , what has already been mentioned several times above applies.

[0061] Depend on Fig. 9 and 10 The design of the parking brake mechanism 70 in the form of a mobile design 140 can be seen.

[0062] Fig. 9 For example, a stator 144 is shown which is axially movable relative to the housing 50 of the eddy current brake 22. The axially movable stator 144 is arranged in accordance with Fig. 9 In the illustration of , for example, the stator 144 can be moved in a stator guide 148, which is part of the housing 50 of the eddy current brake 22. If the axially movable stator 144 is moved, this can be done due to the magnetization of the coil 56 of the eddy current brake 22, so that there is a mechanical contact between the rotor 54 of the eddy current brake 22 and the coil 56, which is in turn guided in the stator guide 148 in a torsionally fixed manner, thereby excluding rotation. If the eddy current brake 22 is used as a normal brake, the movable stator 144 is held in position by a spring 142. The spring 142 is designed so that when used as a normal brake, no contact is established between the axially movable stator 144 and the rotor 54, wherein the magnetic attraction between the rotor 54 and the axially movable stator 144 increases with the reduction of the rotation speed and is at its greatest in the stationary state. Therefore, the elastic force is overcome in the stationary state. After the contact has been established in the stationary state, the actuator 74 is used to apply F lock , which establishes a locking state of the axial displacement mechanism and allows the electric-driven vehicle 10 to be parked without power. This locking state can be achieved, for example, in a form-fitting manner by means of a pin that engages in a toothing.

[0063] By following Fig. 9 The sectional view of FIG. 1 shows that the eddy current brake 22 shown there - in addition to the axially movable stator 144 - basically has and Figure 2 The eddy current brake 22 shown in FIG. 1 has the same components as the stationary stator 64 . Fig. 9 The axially displaceable stator 144 shown in FIG. 1 comprises a yoke element 62 and a number of coils 56 , each of which has a winding 58 wound around an iron core 60 .

[0064] Finally, according to Fig.10 A further embodiment variant of the parking brake mechanism 70 in a movable structural form 140 is shown in the figure. In this embodiment variant, an axial pressing 108 of a movable stator 144 in a stator guide 148 made in the housing 50 of the eddy current brake 22 is performed. With the support of the spring actuator 142, the axial pressing 108 of the movable stator 144 is performed in the axial direction until the friction cone 146 abuts against the corresponding friction surface 150 of the modified stator 64 of the eddy current brake 22. Thus, in accordance with Fig.10 In a variant embodiment, in the locked state of the parking brake device 70 , there is friction contact between the outer side of the friction cone 146 and the modified friction surface 150 of the rotor 54 of the eddy current brake 22 , ie, the rotor 54 having a conical surface.

[0065] According to Fig.10 For the parking brake mechanism 70 of the mobile design 140, it is also applicable that the eddy current brake 22 has a certain number of coils 56, each of which includes a winding 58 wound around a core 60. Here, too, a yoke element 62 is provided for all coils 56 of the eddy current brake 22. In order to maintain the frictional connection between the friction cone 146 on the one hand and the friction surface 150 of the modified rotor 54 on the other hand, their geometries are designed to complement each other.

[0066] In accordance with Fig.10 In a variant embodiment, the movable stator 144 is guided in a stator guide 148 constructed in the housing 50 of the eddy current brake 22 so that the stator is moved by the actuating force F akt 72 Axial press fit 108 is performed when loading.

[0067] With regard to the components of the eddy current brake 22 in the embodiment of the parking brake mechanism 70 in the mobile design 140, the same applies as already described with regard to Figure 2 Description made.

[0068] The invention is not limited to the exemplary embodiments described here and the aspects emphasized therein. Rather, numerous variations are possible within the scope of investigation by a person skilled in the art within the scope of the claims.

Claims

1. An electric machine (24) with an eddy current brake (22) in an electrically driven vehicle (10), wherein the eddy current brake (22) comprises a stator (64, 144) having a number of coils (56) that can be energized and which is opposite a rotor (54, 96) that is connected to a shaft (52) in a rotationally fixed manner, characterized in that: The eddy current brake (22) includes a parking brake mechanism (70) integrated therein, the parking brake mechanism having a generating actuation force (72) F akt An electromechanical actuator (74, 142) is provided, wherein the actuating force is continuously maintained when the electrically driven vehicle (10) is parked and the rotor (54, 96) is locked in its rotational position.

2. The electric machine (24) according to claim 1, characterized in that The electromechanical actuator (74, 142) is designed to be self-locking or cooperates with a transmission (26) that is designed to be self-locking.

3. The electric machine (24) according to claim 1 and 2, characterized in that The parking brake mechanism (70) is used to generate an actuating force (72) F akt And - drum brake structure (76) or - Disc brake structure (90) or - a plunger arrangement (100) with a built-in plunger (102) or - a plunger design (110) with an external plunger (112) or - a wedge structure (120) with radial wedges (122) or -Brake band structure (130) To be made.

4. The electric machine (24) according to claims 1 to 3, characterized in that A parking brake device (70) in the form of a drum brake (76) is integrated into the rotor (54) of the eddy current brake (22), wherein brake blocks (78) can be radially pressed either against an inner circumference (88) or against an outer circumference (89) of the rotor (54).

5. The electric machine (24) according to claim 4, characterized in that The brake shoe (78) is supported at a bearing point (84) which is connected to a housing (50) of the eddy current brake (22) and is radially actuated by means of an actuator (74) arranged inside the rotor (54).

6. The electric machine (24) according to claim 4 and 5, characterized in that The effective surface / friction surface on which the brake block (78) acts on the inner circumference (88) or outer circumference (89) is different from the effective surface of the eddy current brake (22).

7. The electric machine (24) according to claim 4 to 6, characterized in that The brake shoes (78) are connected to one another in an articulated manner by means of webs (82) within the rotor (54) of the eddy current brake (22) and can be radially expanded by means of the actuator (74).

8. The electric machine (24) according to claims 1 to 3, characterized in that A parking brake mechanism (70) in the form of a disk brake (90) comprises a brake caliper (92) assigned to the outer circumference (86) of an enlarged rotor (96) of an eddy current brake (22), which presses a friction lining (94) together in the axial direction.

9. The electric machine (24) according to claim 8, characterized in that The friction lining (94) can be pressed on both sides onto a friction ring (98) of the outer circumference (86) of the enlarged rotor (96).

10. The electric machine (24) according to claims 1 to 3, characterized in that A parking brake mechanism (70) in the form of an internal or external plunger structure (100, 110) either includes a plunger (102) that can be pressed onto the end side of a rotor (54) of an eddy current brake (22) in an axial direction (108) or includes a plunger (112) that can be pressed onto the outer circumference (86) of the rotor (54) of the eddy current brake (22) in a radial press fit (116).

11. The electric machine (24) according to claims 1 to 3, characterized in that A parking brake mechanism (70) in a wedge-shaped structure comprises a certain number of radial wedges (122). During the radial movement of the radial wedges, the rotor (54) of the eddy current brake (22) is pressed against the wedge surface (124) of the housing (50) of the eddy current brake (22).

12. The electric machine (24) according to claims 1 to 3, characterized in that A parking brake mechanism (70) in the form of a brake band design (130) comprises a friction band (132) which is wound around an outer circumference (86) of a rotor (54) and is tensioned by means of the actuator (74).

13. The electric machine (24) according to claim 12, characterized in that A friction band (132), preferably designed as a steel band, is supported in the actuator (74), which in turn is accommodated in a housing (50) of the eddy current brake (22).

14. An electric machine (24) with an eddy current brake (22) in an electrically driven vehicle (10), wherein the eddy current brake (22) comprises a stator (64, 144) having a number of coils (56) that can be energized and which is situated opposite a rotor (54, 96) which is connected to a shaft (52) in a rotationally fixed manner, characterized in that: The eddy current brake (22) comprises a parking brake mechanism (70) integrated therein, which is designed in a movable construction (140) such that the eddy current brake (22) comprises a movable stator (144) which is received in a rotationally fixed manner on a housing (50) of the eddy current brake (22) and which is prestressed by means of a spring actuator (142), pulled electromagnetically in the direction of a rotor (54) and can be locked there.

15. An electric machine (24) with an eddy current brake (22) in an electrically driven vehicle (10), wherein the eddy current brake (22) comprises a stator (64, 144) having a number of coils (56) that can be energized and which is situated opposite a rotor (54, 96) which is connected to a shaft (52) in a rotationally fixed manner, characterized in that: The eddy current brake (22) comprises an integrated parking brake mechanism (70) in a movable construction (140), which has a friction cone (146) formed on an axially movable stator (144), wherein the movable stator (144) is guided in a stator guide (148) and can be pressed onto a friction surface (150) of a rotor (54) of the eddy current brake (22) by means of a spring actuator (142).

16. Use of an electric machine (24) according to any one of claims 1 to 15 in an electric axle module of an electrically driven vehicle (10).

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