Dissipation device and method for dissipating electrical currents
Patent Information
- Application Number
- EP2022724673
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2022-04-21
- Publication Date
- 2025-02-26
AI Technical Summary
Existing dissipation devices for electrical currents in machines, such as electric motors and vehicles, face challenges in detecting wear on sliding contact conductors, leading to premature replacement and potential damage due to induced currents, especially with complex and space-intensive designs.
A derivation device with a bendable conductor featuring a contact conductor and a detector conductor, electrically insulated from each other, allows for detection of wear without mechanical switches, enabling early identification of replacement needs and compact design.
Enables detection of wear on the contact conductor before complete failure, allowing for timely replacement and reducing the risk of damage, while maintaining a compact and efficient design.
Smart Images
Figure 1.1
Abstract
Description
[0001] Discharge device and method for discharging electrical currents
[0002] The invention relates to a diversion device and a method for diverting electrical currents from a rotor part of a machine, in particular an electric motor, vehicle, rail vehicle or the like, which rotor part is formed with an axle or shaft, into a stationary stator part of the machine, comprising a holding device and an electrically conductive contact element, wherein the holding device can be electrically conductively connected to the stationary stator part of the machine, wherein the contact element is designed as a flexible conductor, wherein the conductor has a conductor section forming a sliding contact surface and can be arranged on a circumference or an end face of the rotor part, and an end fastened to the holding device. The invention further relates to a use of a conductor for a diversion device.
[0003] Such discharge devices can be used to dissipate electrostatic charge due to frictional effects or external influences that lead to a potential difference between a rotor part and a stator part of a machine. In particular, such discharge devices can also be used to dissipate electrical charge from electric motors, which can arise, particularly in three-phase motors, as a result of an alternating current induced by the electric current. It is also known to use discharge devices on vehicles, in particular their axles or shafts. The chassis of rail vehicles also have discharge devices that can serve to ground the rail vehicle via a wheelset.
[0004] Dissipation devices can, for example, be formed by a simple carbon brush made of a consumable solid body. It is also known to use a conductor made of a carbon fiber braid or a stranded copper wire as a contact element. However, if this conductor has a sliding contact surface that bears against a contact surface of a rotor part, such as a shaft, the conductor will become worn or abrasive due to the sliding contact. This ultimately leads to the conductor section in question being consumed or severed in the area of the conductor section, particularly if it bears against the rotor part under prestress. Such a failure of a dissipation device is not easily detectable and can, for example, lead to damage to rolling bearings due to induced currents flowing across them.Discharge devices are therefore regularly replaced prematurely during machine maintenance or are equipped with a monitoring device that can detect, for example, a conductor break. Such a discharge device is known, for example, from WO 2019 / 185420 A1. However, the disadvantage here is that the conductor intended for discharge is clamped to a holder and equipped with a mechanical switch to detect a conductor failure. Such discharge devices require a large installation space, are technically complex to manufacture, and are therefore only useful for machines with large shaft diameters.
[0005] The invention is therefore based on the object of proposing a discharge device and a method for discharging electrical currents, with which the achievement of a defined wear of a contact element of the discharge device can be determined by simple means.
[0006] This object is achieved by a discharge device having the features of claim 1, a machine having the features of claim 15, a method having the features of claim 16 and a use of a conductor having the features of claim 17.
[0007] The diversion device according to the invention for diverting electrical currents from a rotor part of a machine, in particular an electric motor, vehicle, rail vehicle or the like, which is formed with an axle or shaft, in a stationary stator part of the machine, comprises a holding device and an electrically conductive contact element, wherein the holding device can be electrically conductively connected to the stationary stator part of the machine, wherein the contact element is designed as a flexible conductor, wherein the conductor has a conductor section forming a sliding contact surface and can be arranged on a circumference or an end face of the rotor part, and an end fastened to the holding device, wherein the conductor is formed, at least in the conductor section, from a contact conductor forming the sliding contact surface and a detector conductor electrically insulated from the contact conductor.
[0008] Because the conductor is formed from the contact conductor and the detector conductor, at least in the conductor section that rests against the rotor part of the machine, it is in principle possible to conduct two electrically separate or insulated currents through the conductor. Since the contact conductor forms the sliding contact surface, a current induced in the rotor part, for example, can be diverted via the contact conductor and the holding device into the stator part of the machine or vice versa. Because the detector conductor is electrically insulated from the contact conductor, it does not come into contact with the rotor part of the machine, so that no current can flow between the rotor part and the stator part. If the contact conductor is worn to such an extent, for example through abrasive wear, that the detector conductor comes into contact with the rotor part of the machine or makes electrical contact with it, an electrical circuit is interrupted.This interruption is detected by relays or other electronic evaluation devices. This current can also be detected using simple means, without the need for a mechanism with a switch or the like. The current can also be detected remotely from the mounting location of the conductor or the holding device on the rotor part. Likewise, it is not necessary to mount the flexible conductor at two ends to the holding device for fastening or under tension. It is sufficient if the flexible conductor is attached to the holding device at one end and rests with the sliding contact surface on the rotor part. Therefore, only a small amount of space is required at the mounting location for the holding device and the flexible conductor, allowing the discharge device to be designed to be particularly compact.Furthermore, even before the conductor is severed due to wear, a state of wear requiring replacement of the conductor or the discharge device can be determined. Completely severing the contact conductor in the area of the sliding contact surface does not immediately lead to the conductor being torn off, as the detector conductor still exists in this area.
[0009] The contact conductor and the detector conductor can be electrically insulated from each other by a dielectric material. The dielectric material can be, for example, a suitable plastic or a varnish. The plastic can electrically separate the detector conductor and the contact conductor or be arranged in the form of a layer between the contact conductor and the detector conductor. For example, the detector conductor can be surrounded by the plastic material. If the detector conductor consists of individual filaments, these can also be coated with a dielectric varnish so that electrical contact cannot easily be formed between the filaments of the detector conductor and the filaments of the contact conductor.
[0010] The contact conductor can be formed by a single wire, a stranded wire, or a braid, and the detector conductor can be formed by a single wire, a stranded wire, or a braid. Consequently, the contact conductor and the detector conductor can be structurally identical or different.
[0011] The conductor can be a round conductor or a conductor strip. The round conductor can then have a circular or oval cross-section. The conductor strip can have a square or rectangular cross-section. With a conductor strip, a comparatively large sliding contact surface can be applied to the rotor part, thus ensuring reliable contact between the contact conductor and the detector conductor. Advantageously, the conductor can be formed along its entire length with the contact conductor and the detector conductor. The cross-section of the conductor is then always the same.
[0012] The contact conductor and the detector conductor can be arranged concentrically relative to the conductor's cross-section. Accordingly, the detector conductor can be arranged within the contact conductor. Such a conductor is particularly easy to manufacture, since the detector conductor can then be first surrounded by an insulating layer and then by the contact conductor.
[0013] The detector conductor can, relative to a cross-section of the conductor, at least partially form a rear surface of the conductor facing away from the sliding contact surface. For example, the conductor can then be formed from three layers, consisting of the contact conductor, an insulating layer, and the detector conductor. The insulating layer then lies between the detector conductor and the contact conductor, with the contact conductor always being arranged between the rotor part and the insulating layer or the detector conductor. The detector conductor can form the rear surface of the conductor completely or partially.
[0014] The cross-sectional area of the contact conductor can be configured in a ratio of 2:1, 5:1, 10:1, 50:1, or 100:1 to the cross-sectional area of the detector conductor. In principle, the detector conductor can also have a larger cross-sectional area than the contact conductor, although this is not required. Since no currents need to be conducted via the detector conductor, and only the existence of an electrical contact is to be detected, it is sufficient for the detector conductor to have a comparatively smaller cross-sectional area than the contact conductor.
[0015] The contact conductor and the detector conductor can be made predominantly or entirely of copper, aluminum, and / or carbon fiber. The conductor, apart from an insulating layer or insulation of the detector conductor, can be made of the same material. Alternatively, the contact conductor and the detector conductor can be made of different materials.
[0016] The conductor can be designed to be flexible in such a way that a contact force can be applied to the contact surface to form an electrically conductive sliding contact between the sliding contact surface of the conductor and a contact surface on the rotor part. The conductor can then be positioned on the rotor part using the holding device so that it rests against the contact surface with a preload or contact force. The conductor does not necessarily have to be mounted with both ends on the holding device so that it can be applied to the contact surface under a preload, although this would also be possible.
[0017] Accordingly, the conductor can be a conductor on the circumference or the end face or
[0018] have a free end that can be arranged on the end face of the rotor part. This makes the holding device particularly easy to design. It is important that the conductor does not rest on the rotor part with its free end, as this would allow direct electrical contact to be formed between the detector conductor and the rotor part. The conductor therefore preferably rests on the rotor part in the conductor section or with a circumference of the conductor. Furthermore, it is also possible to arrange the conductor on the rotor part independently of its shape. The conductor can be arranged radially on the circumference of the rotor part or axially on the end face of the rotor part.
[0019] The conductor can be designed to be curved so that it can bend between the free end and the attached end, such that when the conductor is arranged on the rotor part, the free end extends in the direction of a rotational axis of the rotor part. The curved design of the free end initially ensures that the conductor does not rest against the rotor part with a frontal free end, so that no direct electrical contact can be made with the detector conductor. The free end itself can also be provided with an insulating layer. This electrical contact can then be established via the detector conductor only after the contact conductor has been abrasive removed. If the free end extends in the direction of the rotational axis of the rotor part, the conductor can also rest against the rotor part aligned in the direction of the rotational axis.
[0020] The discharge device can comprise at least two, three, four or more conductors which can be arranged coaxially, preferably symmetrically, on the holding device relative to a rotational axis of the rotor part. By using multiple conductors, the discharge device can reliably ensure the discharge of electrical currents on the rotor part. A coaxial or symmetrical arrangement of the conductors of the holding device or relative to the rotational axis then enables a uniform distribution of the conductors on the rotor part. For example, the holding device can be designed in the form of a ring which is arranged on an end face of the rotor part or on a circumference of the rotor part or surrounds the rotor part. Such a ring is particularly easy to mount, for example in the region of a bearing. The conductors can be arranged equidistant from one another on the ring. Likewise, the holding device can also have another suitable shape.
[0021] The diverting device can comprise a monitoring device for determining electrical contact between the detector conductor and the rotor part. The monitoring device can be, for example, a resistance measuring device. In a particularly simple embodiment, the monitoring device can be embodied by a signal generator, for example a light source, which indicates the flow of a current between the detector conductor and the rotor part or contact conductor. By means of the monitoring device, a voltage can also be applied to the detector conductor and the rotor part or the contact conductor, so that the closure of an electrical circuit via the detector conductor can be detected. The monitoring device can also be embodied by a discrete electronic component or a digital circuit.It is then possible to evaluate the operating state of the discharge device via the monitoring device and, if necessary, to further process operating state information related to a machine malfunction. The monitoring device can comprise means for digital data processing. The monitoring device can be arranged directly on the rotor part of the machine or at any other location spaced apart from the rotor part or the holding device. It is then only necessary to electrically connect the detector conductor to the monitoring device. The detector conductor can also be electrically insulated from the stator part.
[0022] Consequently, the monitoring device can be installed in a location between the ends of the
[0023] detector conductor and the contact conductor or between one end of the detector conductor and the rotor part.
[0024] The machine according to the invention comprises a dissipation device according to the invention for dissipating electrical currents from a rotor part formed with an axle or shaft into a stationary stator part of the machine. The machine can have a plurality of dissipation devices.
[0025] In the method according to the invention for diverting electrical currents from a rotor part of a machine, in particular an electric motor, vehicle, rail vehicle or the like, which is formed with an axle or shaft, in a stationary stator part of the machine, with a diverting device, a holding device of the diverting device is electrically conductively connected to the stationary stator part of the machine, wherein an electrically conductive contact element of the diverting device is formed as a flexible conductor, wherein a conductor section of the conductor forming a sliding contact surface is arranged on a circumference or an end face of the rotor part, and one end of the conductor is fastened to the holding device, wherein the conductor is formed, at least in the conductor section, from a contact conductor forming the sliding contact surface and a detector conductor electrically insulated from the contact conductor.For the advantageous effects of the method according to the invention, reference is made to the description of the advantages of the discharge device according to the invention. Further advantageous embodiments of the method emerge from the feature descriptions of the subclaims referring back to device claim 1.
[0026] In the inventive use of a conductor which, at least in one conductor section of the conductor, is formed from a contact conductor forming a sliding contact surface of the conductor section and a detector conductor electrically insulated from the contact conductor, the conductor is used to divert electrical currents from a rotor part of a machine, in particular an electric motor, vehicle, rail vehicle or the like, formed with an axle or shaft, in a stationary stator part of the machine, wherein a holding device of the diverting device is electrically conductively connected to the stationary stator part of the machine, wherein an electrically conductive contact element of the diverting device is formed as a flexible conductor, wherein a conductor section of the conductor forming a sliding contact surface is arranged on a circumference or an end face of the rotor part, and one end of the conductor is fastened to the holding device,The conductor, at least in the conductor section, is formed from a contact conductor forming the sliding contact surface and a detector conductor electrically insulated from the contact conductor. For the advantageous effects of the use according to the invention, reference is made to the advantageous description of the discharge device according to the invention. Further advantageous embodiments of the use emerge from the feature descriptions of the subclaims referring back to device claim 1.
[0027] Preferred embodiments of the invention are explained in more detail below with reference to the drawings.
[0028] They show:
[0029] Fig. 1 is a schematic representation of a first embodiment of a drainage device;
[0030] Fig. 2 is a schematic representation of a second embodiment of a discharge device;
[0031] Fig. 3 is a schematic representation of a third embodiment of a drainage device;
[0032] Fig. 4 is a cross-sectional view of a first embodiment of a conductor; Fig. 5 is a cross-sectional view of a second embodiment of a conductor;
[0033] Fig. 6 is a cross-sectional view of a third embodiment of a conductor;
[0034] Fig. 7 is a cross-sectional view of a fourth embodiment of a conductor;
[0035] Fig. 8 is a cross-sectional view of a fifth embodiment of a conductor;
[0036] Fig. 9 is a cross-sectional view of a sixth embodiment of a conductor.
[0037] Fig. 1 shows a simplified representation of a discharge device 10 on a rotor part 11 of a machine not shown in detail here. The discharge device 10 comprises a holding device
[0038] 12 and an electrically conductive contact element 13, which rests on a circumference 14 of a shaft 15 of the rotor part 11. The contact element
[0039] 13 is designed as a flexible conductor 16, the opposite ends 17 of which are fastened to the holding device 12. The conductor 16 is in turn formed from a contact conductor 18 and a detector conductor 19, wherein the detector conductor 19 is arranged within the contact conductor 18 and is electrically insulated from the latter. Currents can be diverted from the rotor part 11 into a stator part of the machine (not shown here) via the contact conductor 18. Accordingly, the contact conductor 18, in a conductor section 20, rests with a sliding contact surface 21 on a contact surface 22 on the circumference 14. If the contact conductor 18 or its material in the region of the sliding contact surface 21 is removed due to abrasive wear, an electrically conductive contact is formed between the detector conductor 19 and the shaft 15.This contact can therefore be detected electrically, so that reaching a wear limit of the contact conductor 18 can then be determined.
[0040] Fig. 2 shows a discharge device 23 on a rotor part 24, which is formed from a holding device 25 and a contact element 26. The contact element 26 rests against an axial end face 27 of the rotor part 24 or a shaft 28 and is in turn formed by a flexible conductor 29. One end of the conductor 30 is fastened to the holding device 25, with an opposite free end 31 of the conductor 29 not fastened. The flexible conductor 29 is elastically bendable and therefore rests against the end face 27 with a contact force. The conductor 29 is formed from a contact conductor 32 and a detector conductor 33, wherein the detector conductor 33 is electrically insulated from the contact conductor 32. As already described above in the embodiment shown in Fig. 1, the conductor 29 is constructed in such a way that at least partial consumption of the contact conductor 32 can be detected by the detector conductor 33.
[0041] Fig. 3 shows a further embodiment of a discharge device 34 on a rotor part 35 with a holding device 36 and a contact element 37. The contact element 37 here rests against a circumference 38 of the rotor part 35. The contact element 37 is formed from an arc-shaped, flexible conductor 39. In particular, the conductor 39 is aligned in the direction of a rotational axis 40 of the rotor part 35 or a shaft 41 and runs essentially parallel to the rotational axis 40 in the region of a free end 42 of the conductor 39. Otherwise, the conductor 39 is designed like the conductor of the discharge device from Fig. 2.
[0042] Figure 4 shows a cross-sectional view of a flexible conductor 43 of a discharge device (not shown here). The conductor 43 is formed from a contact conductor 44 and a detector conductor 45, with the detector conductor 45 being electrically insulated from the contact conductor 44 by an insulating layer 46 made of a dielectric material. The conductor 43 is formed with a round cross-section 47, and the contact conductor coaxially surrounds the detector conductor 45.
[0043] Fig. 5 shows a flexible conductor 48 with a contact conductor 49 and a detector conductor 50 as well as an insulating layer 51. A cross section 52 of the conductor 48 is, in contrast to the conductor from Fig. 4, essentially rectangular, so that the conductor 48 is overall band-shaped.
[0044] Fig. 6 shows a flexible conductor 53 or its cross-sectional view with a contact conductor 54, a detector conductor 55 and an insulating layer 56. A cross-section 57 is designed here such that the contact conductor 54 has a substantially rectangular shape and the detector conductor 55 is round and arranged within the contact conductor 54.
[0045] Figure 7 shows a cross-sectional view of a flexible conductor 58 with a contact conductor 59, a detector conductor 60, and an insulating layer 61. The conductor 58 is essentially strip-shaped and has a rectangular cross-section 62. The contact conductor 59, the detector conductor 60, and the insulating layer 61 are also strip-shaped with respect to a length, resulting in a stacked arrangement 63.
[0046] Fig. 8 shows a cross-sectional view of a flexible conductor 64 with a contact conductor 65, a detector conductor 66 and an insulating layer 67. In contrast to the conductor from Fig. 7, here the detector conductor 66 is comparatively narrower than the contact conductor 65, so that a cross-section 68 of the conductor 64 is essentially formed by the contact conductor 65.
[0047] Fig. 9 shows a cross-sectional view of a flexible conductor 69 with a contact conductor 70, a detector conductor 71, and insulating layers 72. The contact conductor 70 is formed from individual filaments 73 arranged in the manner of a braid 74. Within the braid 74, further filaments 75 are arranged, each surrounded by the insulating layer 72 and together forming the detector conductor 71. The conductor 69 is therefore designed as a stranded wire 76, here with a rectangular cross-section 77.
[0048] All of the conductors described above in Figures 1 to 9 can each be designed as a stranded wire with a braid or with two or more wires. These conductors can also be formed from a combination of a stranded wire and one or more wires.
Claims
Claims: A conduction device (10, 23, 34) for conducting electrical currents from a rotor part (11, 24, 35) of a machine, in particular an electric motor, vehicle, rail vehicle or the like, which is formed with an axle or shaft (15, 28, 41), into a stationary stator part of the machine, comprising a holding device (12, 25, 36) and an electrically conductive contact element (13, 26, 37), wherein the holding device is electrically connectable to the stationary stator part of the machine, wherein the contact element is designed as a flexible conductor (16, 29, 39, 43, 48, 53, 58, 64, 69), wherein the conductor has a conductor section forming a sliding contact surface (21) that can be arranged on a circumference (14, 38) or an end face (27) of the rotor part. (20) and has an end (17, 30) attached to the holding device, characterized in that ,that the conductor is formed at least in the conductor section from a contact conductor (18, 32, 44, 49, 54, 59, 65, 70) forming the sliding contact surface and a detector conductor (19, 33, 45, 50, 55, 60, 66, 71) electrically insulated from the contact conductor. A disconnect device according to claim 1, characterized in that the contact conductor (18, 32, 44, 49, 54, 59, 65, 70) and the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) are electrically insulated from each other by means of a dielectric material. A disconnect device according to claim 1 or 2, characterized in that the contact conductor (18, 32, 44, 49, 54, 59, 65, 70) is formed by means of a single wire, a strand, or a braid, and the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) is formed by means of a single wire, a strand, or a braid. A diverting device according to one of the preceding claims, characterized in that the conductor (16, 29, 39, 43, 48, 48, 53, 58, 64, 69) is designed as a round conductor or a conductor strip.A conduction device according to any one of the preceding claims, characterized in that the contact conductor (18, 32, 44, 49, 54) and the detector conductor (19, 33, 45, 50, 55) are arranged concentrically relative to a cross-section (47, 52) of the conductor (16, 29, 39, 43, 48, 53). A conduction device according to any one of claims 1 to 4, characterized in that the detector conductor (19, 33, 60, 66), relative to a cross-section (62, 68) of the conductor (16, 29, 39, 58, 64), forms at least a partial rear surface of the conductor facing away from the sliding contact surface (21). A conduction device according to any one of the preceding claims, characterized in that the cross-sectional area of the contact conductor (18, 32, 44, 49, 54, 59, 65, 70) is configured in a ratio to the cross-sectional area of the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) of 2:1, 5:1, 10:1, 50:1, or 100:
1. A conduction device according to any one of the preceding claims, characterized in that the contact conductor (18, 32, 44, 49, 54, 59, 65, 70) and the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) are predominantly made of copper, aluminum, and / or carbon fibers.A conduction device according to one of the preceding claims, characterized in that the conductor (16, 29, 39, 43, 48, 53, 58, 64, 69) is designed to be flexible such that, in order to form an electrically conductive sliding contact between the sliding contact surface (21) of the conductor and a contact surface (22) on the rotor part (11, 24, 35), the contact surface can be subjected to a contact force. A conduction device according to one of the preceding claims, characterized in that the conductor (29, 39, 43, 48, 53, 58, 64, 69) has a free end (31) that can be arranged on the circumference (38) or the end face (27) of the rotor part (24, 35). A diverting device according to claim 10, characterized in that the conductor (29, 39, 43, 48, 53, 58, 64, 69) is designed to be bendable in an arc shape between the free end (31) and the fixed end (30), such that when the conductor is arranged on the Ro-. The free end of the rotor part (24, 35) extends in the direction of an axis of rotation (40) of the rotor part. A discharge device according to one of the preceding claims, characterized in that the discharge device (10, 23, 34) comprises at least two, three, four or more conductors (16, 29, 39, 43, 48, 53, 58, 64, 69) which are arranged coaxially, preferably symmetrically, on the holding device (12, 25, 36) relative to an axis of rotation (40) of the rotor part (11, 24, 35). A diverting device according to one of the preceding claims, characterized in that the diverting device (10, 23, 34) comprises a monitoring device for determining an electrical contact of the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) with the rotor part (11, 24, 35).A current-discharge device according to claim 13, characterized in that the monitoring device is arranged in a short-circuit loop formed between the ends of the detector conductor and the contact conductor (18, 32, 44, 49, 54, 59, 65, 70) or between an end of the detector conductor (19, 33, 45, 50, 55, 60, 66, 71) and the rotor part (11, 24, 35). A machine with a current-discharge device (10, 23, 34) according to one of the preceding claims for discharging electrical currents from a rotor part (11, 24, 35) formed with an axle or shaft (15, 28, 41) into a stationary stator part of the machine. Method for conducting electrical currents from a rotor part (11, 24, 35) of a machine, in particular an electric motor, vehicle, rail vehicle or the like, which is formed with an axle or shaft (15, 28, 41), into a stationary stator part of the machine, with a conduction device (10, 23, 34), wherein a holding device (12, 25, 36) of the conduction device is electrically connected to the stationary stator part of the machine, wherein an electrically conductive contact element (13, 26, 37) of the conduction device is designed as a flexible conductor (16, 29, 39, 43, 48, 53, 58, 64, 69), wherein a conductor section (20) forming a sliding contact surface (21) is attached to a circumference (14, 38) or an end face (27) of the rotor part. is arranged, and one end (17, 30) of the conductor is attached to the holding device, characterized in that ,that the conductor is formed at least in the conductor section from a contact conductor (18, 32, 44, 49, 54, 59, 65, 70) forming the sliding contact surface and a detector conductor (19, 33, 45, 50, 55, 60, 66, 71) electrically insulated from the contact conductor. Use of a conductor (16, 29, 39, 43, 48, 53, 58, 64, 69), which in at least one conductor section (20) of the conductor is formed from a contact conductor (18, 32, 44, 49, 54, 59, 65, 70) forming a sliding contact surface (21) of the conductor section and a detector conductor (19, 33, 45, 50, 55, 60, 66, 71) electrically insulated from the contact conductor, for conducting electrical currents from a rotor part (11, 24, 35) of a machine, in particular an electric motor, vehicle, rail vehicle or the like, formed with an axle or shaft (15, 28, 41), into a stationary stator part of the machine, with a conduction device (10, 23, 34) comprising a Holding device (12, 25,36) and an electrically conductive contact element (13, 26, 37), wherein the holding device is connected to the, is electrically connected to the stationary stator part of the machine, wherein the contact element is designed as a flexible conductor ( 16, 29, 39, 43 , 48, 48, 53 , 58, 64, 69), wherein the conductor has an end ( 17, 30) attached to the holding device, wherein the conductor section is arranged on a circumference (14, 38) or an end face (27) of the rotor part.