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EP-4740292-A1 - ROTOR WITH SLIP RING ASSEMBLY FOR AN EXTERNALLY EXCITED ELECTRIC MACHINE, ELECTRIC MACHINE, MOTOR VEHICLE, AND METHOD FOR PRODUCING A ROTOR

EP4740292A1EP 4740292 A1EP4740292 A1EP 4740292A1EP-4740292-A1

Abstract

The invention relates to a rotor (10) for an externally excited electric machine (12), having a rotor shaft (14) with a laminated core (18) which is arranged on the rotor shaft (14), said laminated core (18) having at least one salient pole (20) with a rotor winding (24) wound on the salient pole (20) and having an end face (22) which is oriented in the axial direction of the rotor (10), wherein the rotor winding (24) which is guided outwards via the end face (22) forms a winding head (26); a slip ring assembly (30) which is arranged on a shaft end section (28) of the rotor shaft (14) and which has a ring support (32); a slip ring (34); and a connecting wire (36) connected to the slip ring (34). The connecting wire (36) is guided from the slip ring (34) through the ring support (32), and the ring support (32) extends between the distal end (60) of the shaft end section (28) and a region below the winding head (26). A connecting end section (38) of the connecting wire (36) is guided into the region below the winding head (26), with respect to the longitudinal direction of the rotor (10), and a conductor end (42) of the rotor winding (24) is connected to the connecting end section (38) in an electrically conductive manner.

Inventors

  • KRONE, NILS
  • MARINA, Tomislav

Assignees

  • Schaeffler Technologies AG & Co. KG

Dates

Publication Date
20260513
Application Date
20240708

Claims (15)

  1. 1 . Rotor (10) for a separately excited electrical machine (12), having a rotor shaft (14) with a laminated core (18) arranged on the rotor shaft (14), wherein the laminated core (18) has at least one salient pole (20) with a rotor winding (24) wound on the salient pole (20) and an end side (22) aligned in an axial direction of the rotor (10), wherein the rotor winding (24) extending beyond the end side (22) forms a winding head (26), a slip ring arrangement (30) arranged on a shaft end section (28) of the rotor shaft (14), which has a ring carrier (32), a slip ring (34) and a connecting wire (36) connected to the slip ring (34), wherein the connecting wire (36) is guided from the slip ring (34) through the ring carrier (32), the ring carrier (32) is located between a distal end (60) the shaft end portion (28) and an area below the winding head (26), and a connecting end portion (38) of the connecting wire (36), based on a longitudinal direction of the rotor (10), is guided into the area below the winding head (26), and a conductor end (42) of the rotor winding (24) is electrically conductively connected to the connecting end portion (38).
  2. 2. Rotor according to claim 1, characterized in that the electrically conductive connection is a material connection.
  3. 3. Rotor according to one of the preceding claims, characterized in that the connecting end portion (38) is arranged at an angle a between 30 < a < 85° relative to a longitudinal direction of the rotor, the limits being included.
  4. 4. Rotor according to one of the preceding claims, characterized in that a sealing element (48) is arranged between the rotor shaft (14) and an inner circumferential surface of the ring carrier (32) and/or between the shaft end section (28) and the inner circumferential surface of the ring carrier (32).
  5. 5. Rotor according to one of the preceding claims, characterized in that a deflection cap (50) for guiding the rotor winding (24) in the region of the end side (22) is arranged on the end side (22) of the laminated core (18).
  6. 6. Rotor according to one of the preceding claims, in that the shaft end section (28) has a bearing seat (64), in the region of the bearing seat (64) on an outer side of the shaft end section (28) aligned in the radial direction of the rotor (10) a groove running in the longitudinal direction of the rotor (10) is formed, and a section of the ring carrier (32) having the connecting section (36) runs in this groove.
  7. 7. Rotor according to claim 6, characterized in that an outer diameter of the ring carrier (32) in the region of the bearing seat (64) is equal to or smaller than an outer diameter of the bearing seat (64) of the shaft end portion (28).
  8. 8. Rotor according to one of the preceding claims, characterized in that a sealing section (66) for sealing with a first shaft sealing ring (54) and/or a second shaft sealing ring (56) is formed on an outer circumferential surface (66) of the ring carrier (32).
  9. 9. Rotor according to claim 7 or 8, characterized in that an outer diameter of the bearing seat (64) and/or the sealing portion (66) is larger than an outer diameter of the slip ring (34).
  10. 10. Electric machine (12) with a rotor (10) according to one of the preceding claims.
  11. 11. Motor vehicle (68) with an electric machine (12) according to claim 10, wherein the electric machine (12) is part of a traction drive of the motor vehicle (68).
  12. 12. A method for producing a rotor (10) comprising the steps: - Providing a rotor shaft (14) with a laminated core (18) arranged on the rotor shaft (14), which has at least one salient pole (20) and has an end face (22) aligned in an axial direction of the rotor (10); - Winding a rotor winding (24) onto the salient pole (20), wherein the rotor winding (24) extending beyond the end face (22) forms a winding head (26); - arranging a slip ring arrangement (30) on a shaft end portion (28) of the rotor shaft (14), the slip ring arrangement (30) comprising a ring carrier (32), a slip ring (34) and a connecting wire (36) connected to the slip ring (34), and a connecting end portion (38) of the connecting wire (36), relative to a longitudinal direction of the rotor, into an area below the winding head (26), i.e. between the rotor shaft (14) and the winding head (26), is guided, formed or positioned; - Establishing an electrically conductive connection between a conductor end (42) of the rotor winding (24) and the connecting end portion (38) of the connecting wire (36).
  13. 13. Method according to claim 12, characterized in that the slip ring arrangement (30) having the connecting wire (36), wherein the connecting wire (36) extends from the slip ring (34) to the connecting end portion (38) in the ring carrier (32), is pushed onto the shaft end portion (28) in the axial direction of the rotor (10).
  14. 14. Method according to claim 12 or 13, characterized in that an electrode of a welding device is guided in a direction parallel to the longitudinal axis (46) of the rotor (10) in order to carry out the electrically conductive connection between the conductor end (42) and the connecting end portion (38).
  15. 15. Method according to one of claims 12 to 14, characterized in that the rotor winding (24) is wound onto the salient pole (20) after the arrangement of the slip ring arrangement (30) on the shaft end section (28) or is wound onto the salient pole (20) before the arrangement of the slip ring arrangement (30) on the shaft end section (28).

Description

Description Rotor with slip ring arrangement for a separately excited electrical machine, electrical machine, motor vehicle and method for producing a rotor The invention relates to a rotor for a separately excited electrical machine, wherein the rotor has a rotor shaft on which a slip ring arrangement is arranged, and a connecting wire of the slip ring arrangement is electrically conductively connected to a rotor winding wound on the rotor or on a laminated core of the rotor. The invention also relates to an electrical machine with the rotor according to the invention. A further subject of the invention is a motor vehicle with the electrical machine according to the invention. The invention also relates to a method for producing the rotor. Rotors for a separately excited electrical machine are well known. The rotors usually have a rotor shaft with a laminated core arranged on the rotor shaft. A rotor winding is wound on one pole of the laminated core. A slip ring arrangement is attached to the end of the rotor shaft, the slip ring of which is connected to the rotor winding via a connecting wire. The connecting wire is usually deflected out of the slip ring arrangement in the radial direction of the rotor shaft in order to be connected to the rotor winding. Due to the fact that a distance from the winding head is required for a welding electrode to connect the connecting wire to the rotor winding, the installation space of the rotor is increased in the axial direction. An object of the invention is to provide and/or produce a rotor for a separately excited electrical machine, which can have a reduced axial installation space and is easy to manufacture. The object of the invention 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. Each described and/or shown feature can represent an aspect of the invention both individually and in combination, unless the description explicitly states otherwise. In a first aspect, the invention relates to a rotor for a separately excited electrical machine, having a rotor shaft with a laminated core arranged on the rotor shaft, wherein the laminated core has at least one salient pole with a rotor winding wound on the pole and an end side aligned in an axial direction of the rotor, wherein the rotor winding extending beyond the end side forms a winding head, a slip ring arrangement arranged on a shaft end section of the rotor shaft, which has a ring carrier, a slip ring and a connecting wire connected to the slip ring, wherein the connecting wire is guided through the ring carrier starting from the slip ring, the ring carrier extends between a distal end of the shaft end section and an area below the winding head, and a connecting end section of the connecting wire is guided into the area below the winding head, based on a longitudinal direction of the rotor, and a conductor end of the rotor winding is electrically conductively connected to the connecting end section. In other words, according to the first aspect of the invention, a rotor is provided for an externally excited electrical machine. The rotor has a rotor shaft. A laminated core is arranged in a rotationally fixed manner on the rotor shaft, in particular on an outer surface of the rotor shaft. The laminated core has at least one salient pole. The salient pole is usually aligned in a radial direction of the rotor. It is conceivable that the salient pole has a pole shaft and a pole shoe adjacent to the pole shaft. As a rule, the rotor has a plurality of poles that are arranged and/or formed at regular or irregular intervals in the circumferential direction of the laminated core. The laminated core also has an end side aligned in an axial direction of the rotor. A rotor winding is wound on the salient pole. The rotor winding is usually formed by an electrically conductive wire, which preferably has an electrically insulating coating. The rotor winding that extends beyond the end side forms a winding head. A slip ring arrangement is arranged on a shaft end section of the rotor shaft. The slip ring arrangement comprises a ring carrier, at least one slip ring and a connecting wire that is electrically connected to the slip ring. The connecting wire runs from the slip ring through the ring carrier. The ring carrier extends between a distal end the shaft end section and an area below the winding head. Due to the fact that the connecting wire is arranged and embedded in the ring carrier, the slip ring arrangement can be easily pushed onto the shaft end section from the outside. This means that the shaft end section does not have to be designed as a hollow shaft and there is no need for the complex process of guiding the connecting wire through a hollow space. Consequently, the slip ring arrangement can be easily arranged on the shaft end section. A free connection end