Electric machine with an eddy-current brake

Abstract

The invention relates to 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) which has a number of energizable coils (56) and which is opposite a rotor (54, 96) which is connected to a shaft (52) for rotation therewith. The eddy-current brake (22) comprises a parking brake mechanism (70) which is integrated therein and contains an electromechanical actuator (74) which generates an actuating force (72) Fakt which is maintained when the electrically driven vehicle (10) is parked and which blocks the rotor (54, 96) in its rotational position. The invention furthermore relates to the use of the electric machine (24) with an eddy- current brake (22) having an integrated parking brake mechanism (70) in an electrically driven vehicle (10).

Description

[0001] title

[0002] Electric machine with an eddy current brake

[0003] Technical area

[0004] The invention relates to an electric machine with an eddy-current brake in an electrically powered vehicle. The eddy-current brake comprises a stator having a number of energizable coils and located opposite a rotor that is rotationally fixedly connected to a shaft. Furthermore, the invention relates to the use of the electric drive with an eddy-current brake with an integrated parking mechanism in an electrically powered vehicle.

[0005] State of the art

[0006] DE 10 2020 200 852 A1 relates to a drive system designed to minimize stress on the mechanical brake by generating braking force through the action of the mechanical and / or eddy-current brake on an active unit rotatably connected to a rotor of the electric motor along a rotation axis. The active unit can be mechanically or electromagnetically actuated by a combination of the eddy-current brake and the mechanical brake to generate braking force. The eddy-current and / or mechanical brake are activated by the power electronics, depending on the required deceleration (e.g., normal operation or emergency braking). In one embodiment, the active unit is described in the form of a drum, in another in the form of a disc, and is in each case a component of both the mechanical brake and the eddy-current brake. The combined use enables a compact design of the drive unit.The mechanical brake generates braking force even in the event of a power failure or failure of the eddy-current brake and can be configured to function as a parking brake or handbrake. It can be operated with particularly low wear and tear if the braking force is to be applied by the mechanical brake in the event of a power failure, a parking maneuver, or a low rotational speed of the active unit.

[0007] DE 10 2019 201 952 A1 relates to a parking brake in an electric axle drive, which is implemented using a magnetorheological fluid. A braking device is disclosed that has a stationary and a rotating part, between which a gap containing magnetorheological fluid runs. This allows for a significant simplification of the design of a parking brake or a simpler implementation of a parking brake function, which is characterized by both a small installation space and a low weight.

[0008] In electric vehicles, braking is primarily regenerative, operating the electric motor in generator mode. Despite this, today's electric vehicles still feature hydraulically actuated friction brakes, just like those powered by combustion engines. This is partly due to the fact that braking at high speeds occurs within the field-weakening range of the electric motor. This means that at high speeds, the generator's braking torque is typically insufficient for emergency braking or full braking. Regarding availability, it cannot be assumed that an electric motor operating in generator mode will always be able to provide the required requested braking torque.

[0009] Description of the invention

[0010] According to the invention, an electrical machine is proposed that includes an eddy-current brake and is installed in an electrically powered vehicle. The eddy-current brake comprises a stator having a number of energizable coils and located opposite a rotor that is rotationally fixedly connected to a shaft. The eddy-current brake includes a parking brake mechanism integrated therein, which comprises an electromechanical actuator that generates an actuating force that is maintained when the electrically powered vehicle is parked and locks the rotor in its rotational position.

[0011] The electric machine proposed according to the invention significantly improves the standstill management of an electrically driven vehicle, since the parking brake mechanism now blocks the electrically driven vehicle in the de-energized state of the vehicle, as the eddy current brake does not exert any braking effect.

[0012] In an advantageous embodiment of the electric machine proposed according to the invention, the electromechanical actuator actuating the parking brake mechanism is designed to be self-locking or interacts with a self-locking gear.

[0013] The electric machine proposed according to the invention, which comprises the parking brake mechanism for generating the actuating force, can be installed either in

[0014] Drum brake design or disc brake design or stamp design with internal stamp or stamp design with external stamp or wedge design with radial wedges or brake band design.

[0015] All variants of the parking brake mechanism have in common that the parking brake mechanism remains effective when the electrically powered vehicle is de-energized, regardless of the function of the eddy-current brake provided in the electric vehicle. While this provides an effective braking option when the electrically powered vehicle is moving, the parking brake mechanism integrated into the eddy-current brake takes over the standstill management of the electrically powered vehicle. The parking brake mechanism utilizes components of the eddy-current brake of the electric motor, thus saving weight due to the multiple use of existing components.

[0016] In an advantageous first embodiment of the parking brake mechanism, it is designed as a drum brake and integrated into the rotor of the eddy current brake, wherein either brake shoes are positioned against an inner surface of the rotor or against an outer surface of the rotor in the radial direction.

[0017] In a further embodiment of this design variant, the brake shoes are supported in a bearing point which is connected to a housing of the eddy current brake and can be actuated radially by means of the actuator arranged within the rotor.

[0018] In a further advantageous embodiment of the first embodiment of the drum brake-type parking brake mechanism, the active surfaces or friction surfaces on which the brake shoes act on the inner or outer circumferential surface are different from the active surface of the eddy-current brake. This results in frictional force being distributed across mutually independent surfaces.

[0019] In an advantageous embodiment of the first embodiment variant of the parking brake mechanism in drum brake design, the brake shoes within the rotor of the eddy current brake are connected to one another in an articulated manner by means of a web and can be spread apart in the radial direction by means of the actuator.

[0020] In a further second advantageous embodiment variant, the parking brake mechanism is designed as a disc brake, wherein the outer circumference of an enlarged rotor of the eddy current brake is assigned a brake calliper whose friction linings are adjustable in the axial direction.

[0021] In a further advantageous embodiment of this second embodiment of the parking brake mechanism in disc brake design, the friction linings can be adjusted on both sides against a friction ring on the outer circumference of the enlarged rotor of the eddy-current brake. In a third embodiment of the parking brake mechanism proposed according to the invention, this is designed as an internal or external piston design, with either a piston that can be adjusted axially on one end face of the rotor or, alternatively, a piston that can be adjusted radially on the outer circumference of the rotor of the eddy-current brake.

[0022] In a further advantageous fourth embodiment of the parking brake mechanism proposed according to the invention, the latter is designed in a wedge construction, wherein a number of radial wedges are provided which, during their radial movement, position the rotor of the eddy current brake against a wedge surface formed on the housing of the eddy current brake and fix it in this positioned position.

[0023] Finally, in an advantageous fifth embodiment, the parking brake mechanism is designed as a brake band, with a friction band that wraps around an outer radius of the rotor and can be tightened by the actuator. In this embodiment of the parking brake mechanism, the friction band is supported in the actuator, which in turn is mounted on the housing of the eddy-current brake.

[0024] In an advantageous further embodiment, the electric machine with an eddy current brake within an electric vehicle comprises a stator which has a number of energizable coils and which is opposite a rotor which is connected in a rotationally fixed manner to a shaft, wherein the eddy current brake comprises a parking brake mechanism integrated therein which is designed in a sliding construction such that an eddy current brake comprises a sliding stator which is connected in a rotationally fixed manner to a housing of the eddy current brake and is pretensioned by means of a spring actuator and is pulled electromagnetically in the direction of the rotor and can be locked there.

[0025] Furthermore, in an advantageous embodiment of the electric machine proposed according to the invention with an integrated parking brake mechanism, it is provided that this is also designed in a sliding construction, wherein a sliding stator of the eddy current brake comprises a friction cone, the sliding stator is guided in a stator guide and can be adjusted to the friction surface of the rotor of the eddy current brake by means of a spring actuator.

[0026] Furthermore, the invention relates to the use of the electric machine in an e-axle module of an electrically powered vehicle.

[0027] Advantages of the invention

[0028] The solution proposed by the invention advantageously allows a parking brake mechanism to be incorporated into an eddy-current brake centrally integrated in the drive train of an electrically powered vehicle. This allows, for example, the parking brake functionality to be implemented even for vehicles that have only a central eddy-current brake as a service brake instead of conventional wheel brakes, particularly on the rear axle. Furthermore, the parking brake, especially when used with an eddy-current brake, can be used to support the service brake at low speeds.The parking brake mechanism, in its various embodiments, advantageously acts on the brake disc used for the eddy-current brake, which constitutes the rotor of the eddy-current brake, and frictionally locks it when the vehicle is stationary, since in this state of the vehicle the eddy-current brake exerts no braking effect. Furthermore, by utilizing the components of the eddy-current brake, the parking brake mechanism proposed by the invention can contribute to saving components or reusing existing components. Furthermore, the brake actuator system proposed by the invention can be used as a parking brake at low driving speeds as a friction brake to support or backup the service brake.

[0029] A further advantage of the solution proposed according to the invention is that the electric motor and the eddy-current brake are usually connected to the vehicle's wheels via a transmission (often with a high gear ratio greater than 10). This increases the torque. This, in turn, allows the parking brake actuator in this design variant to be particularly small and cost-effective. Brief description of the drawings

[0030] Embodiments of the invention are explained in more detail with reference to the drawings and the following description.

[0031] They show:

[0032] Figure 1 is a schematic representation of an electrically driven vehicle in which an eddy current brake is assigned to the electric machine, which acts as a central brake on the rear axle of the vehicle topology,

[0033] Figure 2 shows the essential components of an eddy current brake,

[0034] Figures 3 and 3.1 show the first embodiment of the parking brake mechanism, integrated into the eddy current brake in drum brake design,

[0035] Figure 4 shows the parking brake mechanism, designed in disc brake construction,

[0036] Figure 5 shows a third variant of the parking brake mechanism in stamp design (internal),

[0037] Figure 6 shows an alternative to the stamping design according to Figure 5, in which the parking brake mechanism is constructed in an external stamping design,

[0038] Figure 7 shows another variant of the parking brake mechanism in wedge design,

[0039] Figures 8 and 8.1 show the design of the parking brake mechanism integrated into the eddy current brake in brake band construction and Figures 9 and 10 show the design of the parking brake mechanism proposed according to the invention in sliding construction with a sliding stator.

[0040] Embodiments of the invention

[0041] In the following description of the embodiments of the invention, identical or similar elements are designated by the same reference numerals, whereby a repeated description of these elements is omitted in individual cases. The figures only schematically illustrate the subject matter of the invention.

[0042] Figure 1 schematically shows a vehicle topology of an electrically powered vehicle 10, whose front axle 12 has a left front wheel 14 and a right front wheel 16. The two front wheels 14, 16 are each assigned a left wheel brake 18 and a right wheel brake 20, respectively.

[0043] Furthermore, according to the topology in Figure 1, the electrically powered vehicle 10 has an eddy current brake 22, which here is arranged, for example, coaxially with an electric motor 24 and a transmission 26. The parking brake mechanisms 70 described below, with the exception of those that utilize the attractive forces of coils 56 for actuation (see Figures 9 and 10), are also transferable to other designs of eddy current brakes 22, for example, with their radial arrangement relative to the electric motor 24. At an output 28 of the transmission 26, the latter acts on a differential gear 32 of a differential 30, which is also referred to as a differential gear. A first output shaft 34 and a second output shaft 36 opposite the first output shaft extend laterally from the latter, forming a rear axle 38 and driving a left rear wheel 40 and a right rear wheel 42.

[0044] From the illustration in Figure 1 it can be seen that no service brakes are formed on the rear axle 38 of the electrically driven vehicle 10 according to the topology in Figure 1, but rather the braking on the rear axle 38 is effected by the eddy current brake 22 acting on the electric machine 24, which is arranged coaxially to the electric machine 24.

[0045] If the vehicle is stationary, the eddy current brake 22 is ineffective.

[0046] Figure 2 shows the essential components of the eddy current brake 22. The eddy current brake 22, as shown in Figure 2, comprises a stationary housing 50. The housing 50 accommodates a plurality of coils 56, each comprising a winding 58 extending around an iron core 60. The housing 50 comprises a common return element 62 for all coils 56. The coils 56 are located opposite a rotor 54, from which a shaft 52 branches off. This shaft is generally connected to the rotor 54 of the electric machine 24, as shown in Figure 1. Reference numeral 64 denotes a stator of the eddy current brake 22.

[0047] Figures 3 and 3.1 show a first embodiment of a parking brake mechanism 70 in drum brake design 76. Both Figures 3 and 3.1 show that the parking brake mechanism 70 generates an actuating force Fact 72 by means of an actuator 74. This actuator 74 is an electromechanical actuator, which is either self-locking or interacts with a self-locking gear and applies the actuating force to the elements of the parking brake mechanism 70 through the actuating force Fact 72.

[0048] In the embodiment of the parking brake mechanism 70 in drum brake design 76 according to Figures 3 and 3.1, for example, brake shoes 78 are accommodated opposite one another inside the rotor 54 of the eddy current brake 22. The individual brake shoes 78 are each covered with a brake pad 80. The two opposing, semi-cylindrical brake shoes 78 are connected to one another via a web 82 and are held at a bearing point 84. When the actuator 74 is actuated, the two brake shoes 78 are spread apart, i.e., adjusted in the radial direction, and rest against the inner circumferential surface 88 of the rotor 54, so that the rotor is blocked when the electrically powered vehicle 10 is stationary.

[0049] Alternatively, it is possible for the brake shoes 78 to be positioned on an outer peripheral surface 89 of the rotor 54 in an alternative design. This variant of the drum brake design 76 is not illustrated in Figures 3 and 3.1.

[0050] Figure 3 shows that the actuator 74 arranged in the rotor 54 exerts the actuating force Fact 72 in both directions on the brake shoes 78, which are consequently positioned against the inner circumferential surface 88 of the rotor 54 and thus block rotation of the rotor shaft 52 of the electric machine 24 according to the schematic illustration in Figure 1. Thus, when the electrically powered vehicle 10 is stationary, a locking mechanism is provided according to the illustration in Figure 1, so that standstill management of the electrically powered vehicle 10 can be realized by the parking brake mechanism 70.

[0051] The illustration in Figure 4 schematically shows a further, second embodiment of the parking brake mechanism 70 proposed according to the invention, which is integrated into the eddy current brake 22. In this embodiment, a friction ring 98 is located approximately centrally on the rotor 54 of the eddy current brake 22 in disc brake design 90. This friction ring 98 can be arranged, for example, on an enlarged rotor 96 or else on the rotor 54 on its outer circumference according to the preceding figures. The parking brake mechanism 70 in disc brake design 90 comprises a brake caliper 92 arranged on the housing 50 of the eddy current brake 22. Friction linings 94 are integrated in the brake caliper 92, which act in the axial direction and transmit the actuating force Fact 72 to the circumference of the rotor 54 or a rotor 96 with an enlarged diameter.

[0052] The components of the eddy current brake 22 according to the second embodiment variant of the parking brake mechanism 70 integrated into the eddy current brake 22 shown in Figure 4 are identical to those according to Figure 2.

[0053] Figures 5 and 6 show embodiments of a third embodiment of the parking brake mechanism 70, integrated into the eddy current brake 22.

[0054] Figure 5 shows a punch design 100 with an internal punch 102. This punch is pressed axially against the end face of the rotor 54 of the eddy current brake 22 by the actuating force Fact 72. On its end face, the internal punch 102 comprises a friction lining 104 which, in the engaged state at the axial adjustment 108 of the internal punch 102, blocks the rotation of the rotor 54 of the eddy current brake 22, so that the rotation of the shaft 52, for example the drive shaft of the electric machine 24 according to Figure 1, is also blocked. In this embodiment, the components of the eddy current brake 22 are identical to those of the eddy current brake 22 as already described in connection with Figure 2.

[0055] Figure 6 shows a plunger design 110 within the third embodiment of the parking brake mechanism 70, integrated into the eddy current brake 22. According to the illustration in Figure 6, an external plunger 112 is provided, which is movably guided in the radial direction on the housing 50 of the eddy current brake 22 and, when radially adjusted 116, is adjusted against the outer circumference of the rotor 54 of the eddy current brake 22. In this case, too, the rotation of the rotor 54 of the eddy current brake 22 is blocked when the external plunger 112 is radially adjusted 116 against the circumferential surface of the rotor 54, so that the rotation of the shaft 52 is also prevented, thus blocking the electric machine 24.

[0056] Figure 7 shows a fourth embodiment of the parking brake mechanism 70, integrated into the eddy current brake 22.

[0057] According to the illustration in Figure 7, radial wedges 122 are provided in the housing 50 of the eddy current brake 22, which can be retracted radially therein. The parking brake mechanism 70 is therefore designed in a wedge design 120. When the actuating force Fact 72 is applied in the radial direction, the radial wedges 122 retract into the interior of the housing 50 and fix the rotor 54 of the eddy current brake 22 in interaction with wedge surfaces 124 formed on the interior of the housing 50. Consequently, the rotor 54 of the eddy current brake 22 stops rotating, so that in this case too, the rotor 54 of the eddy current brake 22 is blocked and rotation of the shaft 52 is no longer possible. With regard to the components of the eddy current brake 22 according to the illustration in Figure 7, reference is made to the components of the eddy current brake 22 as already described in connection with Figure 2. Figures 8 and 8.1 show a fifth embodiment of the parking brake mechanism 70, integrated into the eddy current brake 22.

[0058] In the fifth embodiment of the parking brake mechanism 70, it is designed in a brake band construction 130. A friction band 132, which is preferably designed as a steel link belt or the like, is received by its ends in the actuator 74. If this generates an actuating force 72, the ends of the friction band 132 are pulled together on the actuator 74, so that the rotor 54 is prevented from rotating and is stopped by the friction band 132 surrounding it. The actuator 74 is mounted on bearings 134 in the housing 50 of the eddy current brake 22. As soon as the friction band 132 has stopped the rotor 54, the rotor is blocked and consequently also blocks the rotation of the shaft 52, for example a rotor shaft of the electrical machine 24 shown schematically in Figure 1. With regard to the components of the eddy current brake 22, the above-mentioned several times already applies.

[0059] Figures 9 and 10 show designs of the parking brake mechanism 70 which are designed in sliding construction 140.

[0060] Figure 9, for example, shows a stator 144 that is axially displaceable relative to the housing 50 of the eddy current brake 22. In the illustration according to Figure 9, the axially displaceable stator 144 is displaceable, for example, in a stator guide 148 that is part of the housing 50 of the eddy current brake 22. If the axially displaceable stator 144 is displaced, this can occur due to the magnetization of the coils 56 of the eddy current brake 22, so that there is mechanical contact between the rotor 54 and the coils 56 of the eddy current brake 22, which in turn are guided in a rotationally fixed manner in the stator guide 148, thus preventing rotation. If the eddy current brake 22 is used as a service brake, the displaceable stator 144 is held in position by a spring 142.The spring 142 is designed such that, when used as a service brake, no contact is established between the axially displaceable stator 144 and the rotor 54. The magnetic attraction between the rotor 54 and the axially displaceable stator 144 increases with decreasing speed and is maximum at standstill. Therefore, the spring force is overcome at standstill. After contact is established at standstill, an actuator 74 is used to apply a force Fiock, which locks the axial displacement mechanism and enables the electrically powered vehicle 10 to be shut down without power. This locking can, for example, be achieved by a positive locking mechanism using a pin that engages a toothing.

[0061] From the sectional view according to Figure 9 it can be seen that the eddy current brake 22 shown therein essentially has - apart from the axially displaceable stator 144 - identical components to the eddy current brake 22 shown in Figure 2 with stationary stator 64. The axially displaceable stator 144 according to the illustration in Figure 9 comprises the return element 62 and a number of coils 56, each of which has windings 58 wound around iron cores 60.

[0062] Finally, the illustration according to Figure 10 shows a further embodiment of the parking brake mechanism 70 in the sliding design 140. In this embodiment, an axial adjustment 108 of the movable stator 144 takes place in the stator guide 148 formed in the housing 50 of the eddy current brake 22. Supported by the spring actuator 142, an axial adjustment 108 of the movable stator 144 takes place in the axial direction until a friction cone 146 bears against corresponding friction surfaces 150 of a modified stator 64 of the eddy current brake 22. Thus, in the embodiment according to Figure 10, in the blocked state of the parking brake mechanism 70, there is frictional contact between the outer side of the friction cone 146 and the friction surface 150 of the modified rotor 54 of the eddy current brake 22, namely one designed with a conical surface.

[0063] The parking brake mechanism 70 according to Figure 10, designed in a sliding construction 140, also has the eddy-current brake 22 comprising a number of coils 56, each comprising windings 58 wound around iron cores 60. Here, too, a return element 62 is provided for all coils 56 of the eddy-current brake 22. To maintain the frictional engagement 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 complementary to one another. In the embodiment variant according to Figure 10, the sliding stator 144 is also guided in a stator guide 148 formed in the housing 50 of the eddy-current brake 22, so that it executes an axial adjustment 108 when subjected to the actuating force Fact 72.

[0064] Regarding the components of the eddy current brake 22 in the embodiments of the parking brake mechanism 70 in the sliding design 140, what has already been said regarding Figure 2 applies. The invention is not limited to the exemplary embodiments described here and the aspects highlighted therein. Rather, a multitude of modifications are possible within the scope specified by the claims, which are within the scope of expert practice.

Claims

Claims 1. An electrical machine (24) having an eddy current brake (22) in an electrically powered vehicle (10), the eddy current brake (22) comprising a stator (64, 144) having a number of energizable coils (56) and located opposite a rotor (54, 96) which is connected in a rotationally fixed manner to a shaft (52), characterized in that the eddy current brake (22) comprises a parking brake mechanism (70) integrated therein, which has an electromechanical actuator (74, 142) which generates an actuating force (72) Fact which is maintained when the electrically powered vehicle (10) is parked and blocks the rotor (54, 96) in its rotational position.

2. Electrical machine (24) according to claim 1, characterized in that the electromechanical actuator (74, 142) is designed to be self-locking or interacts with a self-locking gear (26).

3. Electrical machine (24) according to claims 1 and 2, characterized in that the parking brake mechanism (70) for generating the actuating force (72) in Drum brake design (76) or disc brake design (90) or stamp design (100) with internal stamp (102) or stamp design (110) with external stamp (112) or wedge design (120) with radial wedges (122) or brake band design (130).

4. Electrical machine (24) according to claims 1 to 3, characterized in that the parking brake mechanism (70) in Drum brake construction (76) is integrated into the rotor (54) of the eddy-current brake (22), wherein either brake shoes (78) are radially adjustable against an inner circumferential surface (88) or against an outer circumferential surface (89) of the rotor (54). Electrical machine (24) according to claim 4, characterized in that the brake shoes (78) are 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 the actuator (74) arranged within the rotor (54). Electrical machine (24) according to claims 4 and 5, characterized in that the active surfaces / friction surfaces on which the brake shoes (78) act on the inner circumferential surface (88) or the outer circumferential surface (89) are different from an active surface of the eddy-current brake (22).Electrical machine (24) according to claims 4 to 6, characterized in that the brake shoes (78) are articulated within the rotor (54) of the eddy-current brake (22) by means of a web (82) and can be radially expanded by means of the actuator (74). Electrical machine (24) according to claims 1 to 3, characterized in that the parking brake mechanism (70) in disc brake design (90) comprises a brake caliper (92) assigned to the outer circumference (86) of an enlarged rotor (96) of the eddy-current brake (22), which brake caliper adjusts friction linings (94) in the axial direction. Electrical machine (24) according to claim 8, characterized in that the friction linings (94) can be adjusted on both sides against a friction ring (98) on the outer circumference (86) of the enlarged rotor (96).Electrical machine (24) according to claims 1 to 3, characterized in that the parking brake mechanism (70) in internal or external stamp construction (100, 110) either a stamp (102) which can be placed in the axial direction (108) against an end face of the rotor (54) of the eddy current brake (22) or an in. Radial adjustment (116) comprises a plunger (112) that can be adjusted to the outer circumference (86) of the rotor (54) of the eddy-current brake (22). The electrical machine (24) according to claims 1 to 3, characterized in that the parking brake mechanism (70) in wedge design (120) comprises a number of radial wedges (122), during the radial movement of which the rotor (54) of the eddy-current brake (22) is adjusted against wedge surfaces (124) of the housing (50) of the eddy-current brake (22). The electrical machine (24) according to claims 1 to 3, characterized in that the parking brake mechanism (70) in brake-band design (130) comprises a friction band (132) that is wrapped around an outer circumference (86) of the rotor (54) and is pulled together by means of the actuator (74). Electrical machine (24) according to claim 12, characterized in that the friction band (132), preferably designed as a steel band, is supported in the actuator (74), which in turn is accommodated in the housing (50) of the eddy current brake (22).An electrical machine (24) having an eddy current brake (22) in an electrically powered vehicle (10), wherein the eddy current brake (22) comprises a stator (64, 144) having a number of energizable coils (56) and located opposite a rotor (54, 96) that is connected in a rotationally fixed manner to a shaft (52), characterized in that the eddy current brake (22) comprises a parking brake mechanism (70) integrated therein, which is designed in a sliding construction (140) such that the eddy current brake (22) comprises a sliding stator (144) that is received in a rotationally fixed manner on the housing (50) of the eddy current brake (22) and is prestressed by means of a spring actuator (142), is electromagnetically pulled in the direction of the rotor (54) and can be locked there.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) which has a number of energizable coils (56) and which is 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 sliding construction (140) which has a friction cone (146) formed on an axially displaceable stator (144), wherein the displaceable stator (144) is in a Stator guide (148) is guided and can be adjusted by means of a spring actuator (142) to the one friction surface (150) of the rotor (54) of the eddy current brake (22).

16. Use of the electrical machine (24) according to one of the Claims 1 to 15 in an e-axle module of an electrically powered vehicle (10).

Images