Rotor having slip ring device, method for producing rotor having slip ring device, and electric machine having rotor

Abstract

The invention relates to a rotor (RO) for a separately excited machine, comprising: a constructed rotor shaft (RW) having a cylindrical hollow shaft body (HWK), at the respective axial ends of which a shaft end section (WS) is arranged, the respective shaft end section (WS) having a flange section (FA) and a shaft section (WA), the shaft section (WA) comprising an outer side (AM); a slip ring device (SRV) extending through the shaft section (WA), which slip ring device (SRV) has at least one annular first slip ring (ESR), which projects beyond the distal end (DE) of the shaft section (WA) in the axial direction of the rotor (RO), and a first busbar (ESS), which is connected to the first slip ring (ESR) and extends through the shaft section (WA), wherein one end of the first busbar (ESS) is guided through a first busbar opening (ESO) formed in the flange section (FA) and thereby is led out of the interior of the hollow shaft body (HWK).

Description

Technical Field

[0001] The invention relates to a rotor for an electric machine, wherein the rotor has a constructed rotor shaft with a hollow shaft carrier and a shaft end section arranged at the end side, wherein a slip ring device is guided through the shaft section of the shaft end section. The invention further relates to a method for producing a rotor according to the invention. Furthermore, the subject matter of the invention is a separately excited electric machine having a rotor according to the invention.

[0002] A rotor with a slip ring arrangement is known, for example, from EP 2 816 711 B1, in which the slip ring arrangement is plugged onto the rotor shaft from the outside. The bearing is arranged on the slip ring arrangement in the region of the extrusion-molded electrical conductor. In this case, it is problematic that, due to the arrangement of the bearing in the region of the slip ring arrangement, no fluid-tight seal is provided between the rotor and the sliding contacts mounted on the slip rings. This is particularly disadvantageous in the case of oil cooling of the rotor, since it should be avoided that the oil of the rotor cooling device reaches between the sliding contacts and the slip rings. Summary of the invention

[0003] The object of the present invention is to specify a rotor for a separately excited machine in which slip rings can be arranged in a simple and inexpensive manner and in which a fluid-tight separation between the active part of the rotor and the current-carrying section of the rotor is achieved.

[0004] This object is achieved by the subject matter of the independent patent claims. Preferred developments of the invention are the subject matter of the dependent patent claims, the following description and the drawings, wherein each feature may be an aspect of the invention both individually and in combination, unless something to the contrary is clearly evident from the description.

[0005] In a first aspect, the present invention relates to a rotor for a separately excited motor, the rotor comprising: a constructed rotor shaft having a hollow shaft body of cylindrical structure, shaft end portions being arranged at corresponding axial ends of the hollow shaft body, wherein the corresponding shaft end portions have a flange section and a shaft section, wherein the shaft section includes an outer side surface; a collector ring device extending through the shaft section, the collector ring device having at least one first collector ring of annular structure and a first bus bar, the first collector ring protruding in the axial direction of the rotor beyond the distal end of the shaft section, the first bus bar being connected to the first collector ring and extending through the shaft section, wherein one end of the first bus bar is guided through a first bus bar opening constructed in the flange section and thereby led out from the interior of the hollow shaft body.

[0006] In other words, according to a first aspect of the invention, a rotor for a separately excited electric machine is provided. The electric machine is preferably set up and / or constructed to be arranged in a motor vehicle. The electric machine is preferably located in a drive train of the motor vehicle so as to be able to drive the motor vehicle at least partially electrically.

[0007] The rotor has a constructed rotor shaft. The constructed rotor shaft includes a cylindrical hollow shaft body, on which a rotor laminated core is usually arranged. The rotor laminated core together with the rotor winding arranged thereon can also be referred to as the effective part of the rotor. The shaft end portion is arranged at the corresponding axial end of the hollow shaft body. The corresponding shaft end portion includes a flange section and a shaft section. The flange section is preferably established and / or constructed for connection with the hollow shaft body. The shaft section is preferably established and / or constructed for placing the rotor via at least one bearing device so that the rotor can rotate around the rotor axis of the rotor. For this purpose, it is provided that the shaft section has an outer side surface. The outer side surface is preferably constructed continuously, that is, without interruption, in the circumferential direction of the rotor or the shaft section.

[0008] In addition, the rotor includes a collector ring device, which extends through the shaft section or through the interior of the shaft section. The collector ring device includes at least one first collector ring of an annular structure, which protrudes beyond the distal end of the shaft section in the axial direction of the rotor. The section of the collector ring device that protrudes beyond the distal end of the shaft section can also be called a current-carrying section. The distal end of the shaft section is constructed on the side of the shaft section that is away from the hollow shaft body. The first busbar extending through the shaft section is electrically connected to the first collector ring. The distal end of the first busbar is guided through the first busbar opening constructed in the flange section. Therefore, the distal end of the first busbar is led out from the interior of the hollow shaft body. Therefore, the end of the first busbar can be electrically connected to the rotor winding of the separately excited rotor. The first collector ring and / or the first busbar are respectively constructed of conductive materials. The conductive material preferably has copper and / or is constructed of copper. In particular, the conductive material is a copper alloy, and the copper alloy is particularly advantageously at least partially bronze.

[0009] Due to the internal extension of the slip ring device through the shaft section, the shaft section can have a side surface that is continuous in the circumferential direction of the rotor, on which the bearing device for rotatably mounting the rotor can be arranged. Therefore, a fluid-tight or coolant-tight seal between the bearing device and the bearing seat can be achieved in a simple manner in this area of ​​the shaft section, so that coolant, especially oil, of the rotor can be prevented from reaching the area of ​​the first slip ring. In addition, due to the slip ring device located inside the shaft section, the slip ring device can be arranged in the rotor simply and inexpensively.

[0010] An advantageous improvement of the present invention is that the flange section, the shaft section and / or the hollow shaft body are constructed from the same material. Therefore, it is conceivable that the flange section and the shaft section are constructed from the same material, wherein the hollow shaft body has a different material from the shaft section. However, it is also conceivable that the shaft section and the hollow shaft body are constructed from the same material, wherein the flange section has a different material therefrom. However, it is preferably provided that not only the flange section, the shaft section but also the hollow shaft body are constructed from the same material. This has the advantage that the three components can be connected to each other in a simple manner, as long as the components are not constructed at least partially in one piece with each other. In addition, if the three components are preferably constructed from the same metal material, the risk of contact corrosion can be reduced in the case of the three components.

[0011] Preferably, the shaft section and the shaft flange are constructed in one piece. One-piece construction means that the shaft section and the shaft flange are produced and connected to each other during the manufacturing process. This can be done, for example, by an additive method, a casting method and / or by a milling process.

[0012] In a preferred embodiment of the present invention, it is provided that the flange section, the shaft section and / or the hollow shaft body are made of metal and / or have a metal material. This has the advantage that the rotor can have the required structural rigidity within the planned service life of the rotor using inexpensive materials. In this way, the manufacturing costs of the rotor can be reduced.

[0013] According to an advantageous development of the invention, it is provided that at one axial end of the hollow shaft body, one of the shaft end parts is constructed integrally with the hollow shaft body. It can therefore be provided that the shaft end part is directly constructed integrally with the hollow shaft body. In other words, it is provided that the hollow shaft body has an opening at one distal end, while at the other distal end of the hollow shaft body, the shaft end part is constructed directly, that is to say directly, together with the hollow shaft body during the manufacturing process. This has the advantage that the number of components can be reduced. This can again have a favorable effect on the manufacturing process, thereby reducing the manufacturing costs.

[0014] In a preferred design of the present invention, it is provided that at one axial end of the hollow shaft body, the shaft end part is connected to the hollow shaft body in a material-fitting manner, in a form-fitting manner and / or in a force-fitting manner. The material-fitting connection can preferably be an adhesive connection and / or a welded connection. Preferably, the form-fitting connection can be a connection in which the flange of the shaft end part is engaged with the hollow shaft body at at least one point. This can preferably be a guiding structure including a groove-tenon connection. The force-fitting connection can preferably be a screw connection or a rivet connection. In this case, it can preferably be provided that the flange is screwed onto the hollow shaft body.

[0015] An advantageous design of the present invention provides that the slip ring device has an annular second slip ring and a second busbar, the second slip ring is different from the first slip ring and is spaced apart from the first slip ring in the axial direction of the rotor, the second busbar is connected to the second slip ring and extends through the shaft section, wherein one end of the second busbar is guided through the second busbar opening constructed in the flange section and is thus led out from the interior of the hollow shaft body. In other words, it is provided that the slip ring device has two conductive slip rings spaced apart from each other and separated from each other, wherein each slip ring is connected to at least one conductive busbar. The first slip ring has at least a first busbar, and the second slip ring has at least a second busbar. Not only the ends of the first busbar but also the ends of the second busbar are guided through the corresponding busbar openings in the flange section of the shaft end portion. The respective ends of the busbar are established and constructed for conductive connection with the rotor winding of the rotor.

[0016] It is conceivable that the outer diameter of the annular first slip ring is equal to the outer diameter of the annular second slip ring. This has the advantage that the sliding contacts or carbon brushes acting on the first slip ring and the second slip ring can be arranged at the same height. However, it is disadvantageous that, especially when manufacturing the slip ring device, it is slightly more expensive to arrange the two slip rings adjacent to each other and to guide the two busbars in the slip ring device, because the first busbar and the second busbar are not guided at the same height with respect to the radial direction of the busbar.

[0017] Alternatively, a preferred improvement of the present invention is that the outer diameter of the annular first collector ring is smaller than the inner diameter of the annular second collector ring. If the corresponding busbar extends along the axial direction of the corresponding collector ring, the first collector ring can be guided through the second collector ring, and the first and second collectors extend at least in sections in parallel and / or offset from each other in the circumferential direction. Therefore, the collector rings can be arranged in a simple manner. This is particularly suitable for pressure injection molding encapsulation processes.

[0018] An advantageous design of the present invention is that the first slip ring and / or the second slip ring are arranged in an electrically insulating slip ring carrier. It goes without saying that at least one outer side of the first slip ring and the second slip ring is exposed so that the outer side can be in conductive contact with a sliding contact, which can also be referred to as a carbon brush. It is provided that not only the slip rings but also the first busbar and / or the second busbar are arranged in the slip ring carrier. It is preferably provided here that, except for the corresponding distal sections, these are completely surrounded by the insulating slip ring carrier or embedded in the insulating slip ring carrier. Therefore, the slip ring device can be prefabricated in a simple manner and inserted into the shaft section. The manufacturing costs can be reduced by possible prefabrication.

[0019] It is particularly advantageous to provide that the slip ring carrier seals the busbar opening in the region of the corresponding busbar opening in a medium-tight manner. This prevents coolant from penetrating into the interior of the hollow shaft body via the busbar opening. Likewise, when cooling the hollow shaft body from the inside, a seal can preferably be achieved so that the coolant cannot penetrate to the outside via the busbar opening.

[0020] In principle, the slip ring device can be arranged in the shaft section so that the slip ring device is connected to the shaft section in a torsionally fixed manner. A preferred design scheme of the present invention stipulates that the slip ring device is arranged in the shaft section in a form-fitting manner, in a material-fitting manner and / or in a force-fitting manner. The form-fitting arrangement can stipulate that the shaft section has a protrusion on the side pointing radially inward, and the slip ring device has a recess corresponding to the protrusion on the outer side pointing radially outward, so that when the slip ring device is introduced, the protrusion engages with the recess in the axial direction of the shaft section and forms a fit with the shaft section. The material-fitting connection is preferably an adhesive connection. Preferably, the force-fitting connection can be a screw connection and / or a rivet connection.

[0021] An advantageous improvement of the present invention is that the bearing seat is constructed on the outer side of the shaft section. In the area of ​​the bearing seat, the outer side of the shaft section is completely closed in the circumferential direction. In addition, with respect to the radial direction of the shaft section, a step is constructed in the area of ​​the bearing seat, which serves as a stop for the bearing seat in the axial direction of the rotor. It is particularly advantageous to provide that the bearing device is arranged on the bearing seat so that the rotor can be rotatably mounted. By constructing the bearing seat and arranging the bearing device, it is possible to avoid the coolant of the rotor, in particular the oil, flowing in the direction of the collector rings in the area of ​​the bearing seat and coming into contact with the collector rings.

[0022] In a second aspect, the present invention relates to a method for manufacturing a rotor according to the present invention, wherein a slip ring device is first introduced into a shaft section via the flange side of the shaft end portion using an annular first slip ring, so that the first slip ring is guided beyond the far end of the shaft section and the end of the first busbar is guided through the first busbar opening of the flange section.

[0023] The end of the first busbar is therefore constructed on the side of the busbar facing away from the slip ring. Preferably, the end of the first busbar is deflected so that the end points in the direction of the first slip ring, or is parallel to the longitudinal orientation of the first slip ring. In this way, the slip ring device can be introduced into the shaft section by a translational movement, preferably coaxially with the shaft section, wherein the first slip ring protrudes beyond the distal end of the shaft section and the end of the first busbar is guided through the busbar opening in the flange section. Therefore, the slip ring device can be arranged in the rotor in a simple and inexpensive manner. Due to the slip ring device being constructed in an internal manner, a bearing device for rotatably mounting the rotor can be arranged on the shaft section. The shaft section or the outer side surface can be constructed continuously in the area of ​​the bearing device, so that it can be prevented that the cooling medium of the rotor arrives in the direction of the first slip ring in the area of ​​the rotor bearing structure.

[0024] In a preferred improvement of the present invention, it is provided that after the slip ring device is arranged in the shaft end part, the shaft end part and the hollow shaft body are connected to each other in a material-fitting manner, in a form-fitting manner and / or in a force-fitting manner. The material-fitting connection is preferably an adhesive connection or a welded connection. The form-fitting connection is preferably a groove-tenon connection. The force-fitting connection is preferably a screw connection and / or a rivet connection.

[0025] An advantageous design of the present invention provides that the slip ring device is arranged in the shaft section in a material-fitting manner, in a force-fitting manner and / or in a form-fitting manner. The form-fitting arrangement can provide that the shaft section has a protrusion on the side pointing radially inward, and the slip ring device has a recess corresponding to the protrusion on the outer side pointing radially outward, so that when the slip ring device is introduced, the protrusion engages with the recess in the axial direction of the shaft section and forms a fit with the shaft section. The material-fitting connection is preferably an adhesive connection. Preferably, the force-fitting connection can be a screw connection and / or a rivet connection.

[0026] The slip ring device including the first slip ring and the first busbar is preferably arranged in the slip ring carrier by pressure injection molding. Preferably, the first slip ring, the first busbar, the second slip ring and the second busbar are arranged in the slip ring carrier by pressure injection molding. In this way, a slip ring device is provided, which can be prefabricated and can be arranged in a simple manner in the shaft end part. Therefore, the manufacturing costs can be reduced.

[0027] In a third aspect, the invention relates to a separately excited electrical machine having a rotor according to the invention.

[0028] The electric machine is preferably a component of a traction drive in order to drive the motor vehicle at least partially, preferably completely electrically.

[0029] It should be noted that all features described above and below with respect to one aspect of the invention are equally applicable to each of the other aspects of the invention. In particular, all features of the rotor may also be features of the method and / or the electric machine. This also applies in reverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further features and advantages of the invention are derived from the dependent claims and the following embodiments. The embodiments should not be understood as limiting, but rather as examples. The embodiments should enable a person skilled in the art to implement the invention. The applicant reserves the right to make individual and / or multiple features of the features disclosed in the embodiments the subject of patent claims or to incorporate such features into existing patent claims. The embodiments are explained in more detail with reference to the drawings.

[0031] In said drawings:

[0032] Figure 1 A fragment of a three-dimensional view of a rotor in the region of a shaft end section with a slip ring arrangement;

[0033] Figure 2 An exploded view of the rotor is shown;

[0034] Figure 3 A cross-section through a shaft end portion and a slip ring arrangement is shown. DETAILED DESCRIPTION

[0035] exist Figure 1 , a fragment of a three-dimensional view of a rotor RO in the region of a shaft end portion WS having a slip ring device SRV is shown. The rotor RO has a constructed rotor shaft RW. The constructed rotor shaft RW comprises a cylindrical hollow shaft body HWK, on ​​which a rotor laminated core RBP is arranged in a torsionally fixed manner. The shaft end portion WS is arranged at the respective axial end of the hollow shaft body HWK. The respective shaft end portion WS comprises a flange section FA and a shaft section WA. The flange section FA is connected to the hollow shaft body HWK in a torsionally fixed manner. The shaft section WA is established and / or constructed for placing the rotor RO via at least one bearing device LER so that the rotor can rotate around the rotor axis RA of the rotor RO. For this purpose, it is provided that the shaft section WA has an outer side surface AM. The outer side surface AM is constructed continuously, i.e., without interruption or in a continuous annular manner in the circumferential direction of the rotor RO or the shaft section WA.

[0036] The slip ring device SRV extends through the shaft segment WA and includes a first slip ring ESR of an annular structure and a second slip ring ZSR of an annular structure. Not only the first slip ring ESR but also the second slip ring ZSR protrude beyond the distal end DE of the shaft segment WA at least in sections with respect to the axial direction of the rotor RO. The distal end DE of the shaft segment WA is constructed on the side of the shaft segment WA facing away from the hollow shaft body HWK. The first busbar ESS extending through the shaft segment WA is electrically conductively connected to the first slip ring ESR. Similarly, the second busbar ZSS is in electrically conductive contact with the second slip ring ZSR. The distal end of the first busbar ESS is guided through the first busbar opening ESO constructed in the flange segment FA of the shaft end portion WS. Similarly, the distal end of the second busbar ZSS is guided through the second busbar opening ZSO constructed in the flange segment FA of the shaft end portion WS. Therefore, the distal end of the first busbar ESO and the distal end of the second busbar ZSS are led out from the interior of the hollow shaft body HWK. Therefore, the end of the first busbar ESS and the end of the second busbar ZSS can be electrically conductively connected to the rotor winding (not shown) of the separately excited rotor RO.

[0037] The first slip ring ESR, the second slip ring ZSR, the first busbar ESS and the second busbar ZSS are respectively constructed of a conductive material. The conductive material preferably comprises copper and / or is constructed of copper. It is conceivable that the first busbar ESS is arranged at the first slip ring ESR in a materially fitted manner and / or the second busbar ZSS is arranged at the second slip ring ZSR in a materially fitted manner. The materially fitted connection is preferably a welding or soldering connection. However, it is also conceivable that the first busbar ESS and the first slip ring ESR and / or the second busbar ZSS and the second slip ring ZSR are constructed integrally with each other.

[0038] Due to the internal extension of the slip ring device SRV through the shaft section WA, in the present embodiment, the shaft section WA has an outer side surface AM in the region of the bearing seat LS which is continuous in the circumferential direction of the rotor RO, on which the bearing device LER for rotatably mounting the rotor RO can be arranged. Therefore, in this region of the shaft section WA, a fluid-tight or coolant-tight seal can be realized in a simple manner in the region of the bearing seat LS, so that the coolant of the rotor RO, in particular oil, can be prevented from reaching the region of the slip rings ESR, ZSR.

[0039] Furthermore, it can be seen that the first slip ring ESR, the first bus bar ESS, the second slip ring ZSR and the second bus bar ZSS are arranged in the slip ring carrier SRT by pressure injection molding. In other words, the first slip ring ESR and the first bus bar ESS, the second slip ring ZSR and the second bus bar ZSS are arranged in the slip ring carrier or held by the slip ring carrier. The first slip ring ESR and the second slip ring are electrically isolated from each other in the slip ring carrier SRT and are arranged spaced apart from each other along the axial direction of the rotor RO. The outer side surface of the first slip ring ESR and the outer side surface of the second slip ring ZSR are exposed so that the outer side surface can be in conductive contact with a sliding contact or a carbon brush (not shown). By arranging the slip rings ESR and ZSR in the slip ring carrier SRT, a slip ring device SRV is provided, which can be prefabricated and can be arranged in the shaft end part WS in a simple manner. Therefore, the manufacturing cost can be reduced.

[0040] As from Figure 1 and Figure 2 It can be seen that the outer diameter of the annular first collector ring ESR is smaller than the inner diameter of the annular second collector ring ZSR. If the corresponding busbars ESS, ZSS connected to the collector rings ESR, ZSR extend in the axial direction of the corresponding collector rings ESR, ZSR, the first collector ring ESR can be guided through the second collector ring ZSR and the first busbar ESS and the second busbar ZSS extend at least in sections in parallel and / or offset from each other in the circumferential direction. Therefore, the first collector ring ESR and the second collector ring ZSR can be arranged relative to each other in a simple manner before being pressure-injected by plastic material for constructing the collector ring carrier SRT.

[0041] exist Figure 3, a sectional view through the shaft end portion WS and the slip ring device SRV is shown. The end of the second busbar ZSS is configured on the side of the second busbar ZSS facing away from the second slip ring ZSR, wherein the end of the second busbar ZSS is deflected so that the end points in the direction of the second slip ring ZSR or is parallel to the longitudinal orientation of the second slip ring ZSR. The first busbar ESS is configured in the same way. Therefore, the slip ring device SRV can be introduced into the shaft segment WA by a translation movement, preferably coaxially with the shaft segment WA, wherein the first slip ring ESR and the second slip ring ZSR protrude beyond the distal end DE of the shaft segment WA, and the end of the first busbar ESS is guided through the first busbar opening ESO in the flange segment FA and the end of the second busbar ZSS is guided through the second busbar opening ZSO. Therefore, the slip ring device SRV can be arranged in the rotor RO in a simple and inexpensive manner. Due to the internal design of the slip ring device SRV, the bearing arrangement LER arranged on the shaft section WA for rotatably mounting the rotor RO can achieve a fluid-tight sealing of the shaft section WA so that coolant, in particular oil, from the region of the rotor RO does not reach the slip rings ESR, ZSR in this region.

[0042] The slip-ring carrier SRT is sealed in a medium-tight manner in the region of the first busbar opening ESO and / or in the region of the second busbar opening ZSO, so that a penetration of coolant into the hollow shaft body HWK via the first busbar opening ESO and / or the second busbar opening ZSO can be avoided.

Claims

1. A rotor (RO) for a separately excited motor, the rotor comprising A rotor shaft (RW) is constructed with a cylindrical hollow shaft body (HWK), at the respective axial end of which a shaft end part (WS) is arranged, wherein the respective shaft end part (WS) has a flange section (FA) and a shaft section (WA), which comprises an outer side (AM), A slip ring device (SRV) extends through the shaft section (WA), the slip ring device (SRV) having at least one first slip ring (ESR) of an annular structure and a first bus bar (ESS), the first slip ring protruding in the axial direction of the rotor (RO) beyond the distal end (DE) of the shaft section (WA), the first bus bar being connected to the first slip ring (ESR) and extending through the shaft section (WA), wherein one end of the first bus bar (ESS) is guided through a first bus bar opening (ESO) constructed in the flange section (FA) and thereby led out from the interior of the hollow shaft body (HWK).

2. The rotor according to claim 1, characterized in that The flange section (FA), the shaft section (WA) and / or the hollow shaft body (HWK) are made from the same material.

3. A rotor according to any one of the preceding claims, characterised in that The flange section (FA), the shaft section (WA) and / or the hollow shaft body (HWK) are made of metal and / or comprise a metallic material.

4. A rotor according to any one of the preceding claims, characterised in that At an axial end of the hollow shaft body (HWK), one of the shaft end parts (WS) is formed integrally with the hollow shaft body (HWK).

5. A rotor according to any one of the preceding claims, characterised in that At one axial end of the hollow shaft body (HWK), the shaft end part (WS) is connected to the hollow shaft body (HWK) in a materially fitting, form-fitting and / or force-fitting manner.

6. A rotor according to any one of the preceding claims, characterised in that The slip ring device (SRV) has an annular second slip ring (ZSR) and a second busbar (ZSS), the second slip ring being different from the first slip ring (ESR) and being spaced apart from the first slip ring (ESR) in the axial direction of the rotor (RO), the second busbar being connected to the second slip ring (ZSR) and extending through the shaft section (WA), wherein one end of the second busbar (ZSS) is guided through a second busbar opening (ZSO) constructed in the flange section (FA) and is thus led out from the interior of the hollow shaft body (HWK).

7. The rotor according to claim 6, characterized in that The outer diameter of the annular first collector ring (ESR) is smaller than the inner diameter of the annular second collector ring (ZSR).

8. The rotor according to any one of claims 6 or 7, characterized in that The first slip ring (ESR) and / or the second slip ring (ZSR) are arranged in an electrically insulating slip ring carrier (SRT).

9. The rotor according to claim 8, characterized in that The slip-ring carrier (SRT) closes the respective busbar opening (ESO, ZSO) in the region of the latter in a medium-tight manner.

10. A rotor according to any one of the preceding claims, characterised in that The bearing seat (LS) is formed on the outer side (AM) of the shaft section (WA).

11. A rotor according to any one of the preceding claims, characterised in that The slip ring device (SRV) is arranged in the shaft section (WA) in a form-fitting, materially-fitting and / or force-fitting manner.

12. A method for manufacturing a rotor (RO) according to any of the preceding claims, wherein a slip ring device (SRV) is first introduced into a shaft section (WA) via the flange side of a shaft end portion (WS) using an annular first slip ring (ESR), so that the first slip ring (ESR) is guided beyond the distal end (DE) of the shaft section (WA) and the end of the first busbar (ESS) is guided through a first busbar opening (ESO) of the flange section (FA).

13. The method according to claim 12, characterized in that After the slip ring device (SRV) has been arranged in the shaft end part (WS), the shaft end part (WS) and the hollow shaft body (HWK) are connected to one another in a materially fitting, form-fitting and / or force-fitting manner.

14. The method according to claim 12 or 13, characterized in that The slip ring device (SRV) is arranged in the shaft section (WA) in a materially fitted, force-fitting and / or form-fitting manner.

15. The method according to any one of claims 12 to 14, characterized in that The first slip ring (ESR), the first busbar (ESS), the second slip ring (ZSR) and the second busbar (ZSS) are arranged in the slip ring carrier (SRT) by extrusion encapsulation.

16. An electrical machine having a rotor (RO) according to any one of claims 1 to 11.

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