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CN-122029724-A - Electric machine with a force-fit and form-fit lamination stack and method for mounting the electric machine

CN122029724ACN 122029724 ACN122029724 ACN 122029724ACN-122029724-A

Abstract

An electrical machine (3) is proposed, comprising a stator (7) and a rotor (8) which is rotatably mounted relative to the stator (7) about a rotational axis (100), wherein the stator (7) and/or the rotor (8) comprises a lamination stack (11) which is formed from a plurality of individual laminations (15) which are connected to one another in a stacked manner in an axial direction relative to the rotational axis (100), and a carrier (10) to which the lamination stack (11) is fastened via a force-transmitting connection, wherein the carrier (10) comprises at least one groove (16) which is at least partially circumferential in the region of the force-transmitting connection, at least one of the individual laminations (15) of the lamination stack (11) being partially engaged into the groove in order to form an axial form-fitting connection relative to the rotational axis (100).

Inventors

  • S. LIEM
  • M. Holler
  • A. RIEDEL
  • C. COLE
  • SCHUMACHER SILKE
  • D. Bu Bu

Assignees

  • ZF腓特烈斯哈芬股份公司

Dates

Publication Date
20260512
Application Date
20241009
Priority Date
20231018

Claims (15)

  1. 1. An electric machine (3) having a stator (7) and a rotor (8) which is rotatably mounted relative to the stator (7) about a rotational axis (100), wherein the stator (7) and/or the rotor (8) has a lamination stack (11) formed from a plurality of individual laminations (15) which are connected to one another in a stacked manner in an axial direction relative to the rotational axis (100) and a carrier (10) to which the lamination stack (11) is fastened via a force-transmitting connection, It is characterized in that the method comprises the steps of, The carrier (10) has at least one groove (16) which is at least partially circumferential in the region of the force-transmitting connection and into which at least one individual lamination (15) of the lamination stack (11) engages in sections in order to form an axial form-fitting connection with respect to the axis of rotation (100).
  2. 2. An electric machine (3) according to claim 1, characterized in that the single lamination (15) is abutted against the circumference of the carrier (10) with an elastic pre-tension to form the force-transmitting connection, wherein the at least one single lamination (15) engages into the at least one groove (16) under the effect of the elastic pre-tension in a radial direction with respect to the rotational axis (100).
  3. 3. The electric machine (3) according to claim 1 or 2, characterized in that the individual laminations (15) are each connected to one another via a material connection, wherein the material connection has a reduced holding force (F2) when a target temperature is reached, such that the individual laminations (15) can be moved relative to one another at least in a radial direction relative to the rotational axis (100).
  4. 4. A motor (3) according to claim 3, characterized in that the material connection is formed by an adhesive layer (19).
  5. 5. The electric machine (3) according to any one of the preceding claims, characterized in that the at least one single lamination (15) is accommodated in the slot (16) with a clearance fit in a radial and/or axial direction with respect to the axis of rotation (100).
  6. 6. The electric machine (3) according to any of the preceding claims, characterized in that the axial slot width (101) of the at least one slot (16) is greater than or equal to the axial component width (102) of at least two single laminations (15).
  7. 7. The electric machine (3) according to any one of the preceding claims, characterized in that the carrier (10) has at least one cooling channel (20) extending axially with respect to the axis of rotation (100) for connection to a cooling system, wherein the cooling channel (20) opens into the at least one groove (16).
  8. 8. An electric machine (3) according to claim 7, characterized in that the cooling channel (20) is delimited by the carrier (10) on one side and by the lamination stack (11) on the other side in a radial direction with respect to the axis of rotation (100).
  9. 9. An electric machine (3) according to claim 7 or 8, characterized in that a plurality of the slots (16) are jointly connected to each other in terms of flow technology via the at least one cooling channel (20).
  10. 10. The electric machine (3) according to any one of the preceding claims, characterized in that the lamination stack (11) is composed of at least two sub-lamination stacks, wherein the carrier (10) has at least one slot (16) for each sub-lamination stack.
  11. 11. The electric machine (3) according to any one of the preceding claims, characterized in that the carrier (10) has a local wall thickness thickening (17) at least in the region of the at least one groove (16).
  12. 12. The electric machine (3) according to any of the preceding claims, characterized in that the carrier (10) has at least one circumferential recess (18) for relieving compressive stress.
  13. 13. An electric machine (3) according to any of the preceding claims, characterized in that the carrier (10) has at least one bearing cap section (14) for accommodating a rotor bearing.
  14. 14. A method for mounting an electric machine (3) according to any of the preceding claims, wherein: stacking a plurality of single laminations (15) on each other in an axial direction with respect to the axis of rotation (100) and interconnecting them into a lamination stack (11), -Providing a carrier (10); -connecting the lamination stack (11) with the carrier (10) via a force-transmitting connection, wherein after the force-transmitting connection is established, at least one of the individual laminations (15) engages radially into the at least one slot (16) due to an elastic pre-tensioning force.
  15. 15. Method according to claim 14, characterized in that the individual laminations (15) are connected to each other via a material connection, wherein at least the lamination stack (11) is heated to a target temperature, wherein the holding force (F2) of the material connection is reduced when the target temperature is reached, such that the at least one individual lamination (15) is moved partially into the groove (16) in a radial direction relative to the adjacent individual lamination (15) against the holding force (F2) of the material connection.

Description

Electric machine with a force-fit and form-fit lamination stack and method for mounting the electric machine Technical Field The invention relates to an electric machine having the features of the preamble of claim 1. Furthermore, the invention relates to a method for mounting the motor. Background An electric machine such as a motor or a generator includes a stationary portion configured as a stator and a rotating portion configured as a rotor. In order to produce a rotational movement of the rotor, a spatially and temporally varying magnetic field is usually produced in the rotor and/or stator. In such electric machines, the rotor and/or stator is usually formed as a stack of laminations, wherein for this purpose a plurality of plate laminations stacked one on top of the other are connected, for example, by means of so-called adhesive paint. The lamination stack can be arranged on the cylindrical support by means of a press fit, wherein the lamination stack is positioned between two axial stops for fixing the axial position. Document DE 10 2014 206 848 A1 discloses an annular lamination stack formed from a plurality of axially stacked plate laminations, wherein the lamination stack is fastened with an inner or outer cylindrical fastening section to a cylindrical receiving section of a carrier element, and wherein the carrier element has two stops between which the lamination stack is tensioned in an axial force-transmitting manner, wherein at least one of the stops comprises an annular support element which is arranged at the receiving section and supports the lamination stack, and the support element is fastened to the carrier element by means of at least one press-fit region. Disclosure of Invention The invention provides an electric machine of the type mentioned at the outset, which is characterized in that the lamination stack is simply and reliably fastened to the carrier. The object is achieved by an electric machine having the features of claim 1 and by a method having the features of claim 14. Other features, advantages and effects of the invention are described in the dependent claims, in the description and in the drawings. The subject of the invention is an electric machine which is particularly configured and/or suitable for an electric shaft drive and/or for driving a motor vehicle. Preferably, the electric machine is configured as a traction motor, also known as a Split Motor Generator (SMG). Alternatively, however, the motor can also be configured as a transmission-integrated motor. The motor is preferably a three-phase motor, for example a permanent magnet excited or separately excited, in particular a winding excited synchronous or asynchronous machine. The motor has a stator and a rotor rotatably supported about a rotational axis relative to the stator. In particular, the motor is configured as an inner rotor, wherein the rotor is arranged radially inside the stator. Alternatively, however, the motor can also be configured as an outer rotor, wherein the rotor is arranged radially outside the stator. The stator has a lamination stack, in particular a stator lamination stack, which is formed from a plurality of individual laminations stacked on one another in the axial direction relative to the axis of rotation and connected to one another. Alternatively or additionally, the rotor has a lamination stack, in particular a rotor lamination stack, which is formed from a plurality of individual laminations stacked on one another in the axial direction relative to the axis of rotation and connected to one another. Preferably, the individual laminations are connected to one another to form a common, in particular integral, lamination stack. Alternatively, however, the individual laminations can also be joined to form a plurality of sub-lamination groups which are connected to one another in common, in particular in a multi-piece manner, to form the lamination group. The single-layer stack is preferably formed from a magnetized and/or magnetizable material, preferably a steel alloy. In particular, the single laminate is constructed as a plate laminate. The single laminate can be configured as identical components and/or in identical shapes. The single-piece laminates can be connected to one another in a material-and/or force-transmitting manner. For example, the individual laminations are welded, screwed, glued, stamped stacked, or otherwise connected to one another. The stator further comprises a carrier, in particular a stator carrier, on which the lamination stack, in particular the stator lamination stack, is fastened via a force-transmitting connection. Alternatively or additionally, the rotor has a carrier, in particular a rotor carrier, at which the lamination stack, in particular the rotor lamination stack, is fixed via a force-transmitting connection. In particular, the carrier has a cylindrical receiving section for receiving the lamination stack. In a design as an inner rotor, the force