Search

EP-4740290-A1 - STATOR FOR AN ELECTRIC MACHINE HAVING A STATOR BODY

EP4740290A1EP 4740290 A1EP4740290 A1EP 4740290A1EP-4740290-A1

Abstract

The present invention relates to a stator (10) for an electric machine (100) having a stator body (12), in particular a laminate stack, which extends about a stator axis (34) and comprises a plurality of stator teeth (14) and a stator yoke (15) connecting the plurality of stator teeth (14), wherein the plurality of stator teeth (14) each have, on their tooth ends (16) facing away from the stator yoke (15), in particular tooth tips, a tooth end face (18) for interaction with a rotor (102) of the electric machine (100), wherein at the tooth end faces (18) of at least several stator teeth, depressions (20) are formed which have a depth (22) in the radial direction in relation to the stator axis, a width (23) in the circumferential direction and a length (25) in the axial direction, characterised in that a first set of stator teeth (24) has first depressions (27) and a second set of stator teeth (26) has second depressions (29), and that the first depressions (27) and second depressions (29) are differently designed with regard to at least one dimension, in particular the depth (22) and/or width (23), and/or with regard to the shape.

Inventors

  • THEISINGER, PETER
  • BOLS, Nils Christoph

Assignees

  • Robert Bosch GmbH

Dates

Publication Date
20260513
Application Date
20240612

Claims (9)

  1. 1. Stator (10) for an electrical machine (100) with a stator body (12), in particular a laminated core, which extends around a stator axis (34) and comprises a plurality of stator teeth (14) and a stator yoke (15) connecting the plurality of stator teeth (14), wherein the plurality of stator teeth (14) each have a tooth end face (18) for interacting with a rotor (102) of the electrical machine (100) at their tooth ends (16) facing away from the stator yoke (15), in particular tooth heads, wherein recesses (20) are formed on the tooth end faces (18) of at least several stator teeth, which have a depth (22) in the radial direction with respect to the stator axis (34), a width (23) in the circumferential direction and a length (25) in the axial direction, characterized in that a first set of the stator teeth (24) has first recesses (27) and a second set of stator teeth (26) has second recesses (29) and that the first recesses (27) and second recesses (29) are designed differently with respect to at least one dimension, in particular the depth (22) and/or width (23), and/or with respect to the shape.
  2. 2. Stator (10) according to claim 1, wherein the first recesses (27) alternate with the second recesses (29) around the stator axis (34) of the stator (10).
  3. 3. Stator (10) according to one of the preceding claims, wherein the first recesses (27) have a first depth (34), wherein the second recesses (29) have a second depth (36), wherein the first depth (34) is smaller than the second depth (36).
  4. 4. The stator (10) of claim 3, wherein the second depth (36) is less than 0.8 times a height (38) of a head portion (40) of the second set of stator teeth (14).
  5. 5. Stator (10) according to one of the preceding claims, wherein the first recesses (27) have a first opening angle (42), wherein the second recesses (29) have a second opening angle (44), wherein the first opening angle (42) is smaller than the second opening angle (44).
  6. 6. Stator (10) according to claim 5, wherein the second opening angle (44) is smaller than 0.8 times an angle of attack (46) of a tooth face of the second recesses (29) with respect to the stator axis (34) of the stator (10).
  7. 7. Stator (10) according to one of the preceding claims, wherein the first recesses (27) have a first contour (46), wherein the second recesses (29) have a second contour (48), wherein the first contour (46) and the second contour (48) differ from one another.
  8. 8. Stator (10) according to one of the preceding claims, wherein the first contour (46) and the second contour (48) have at least one contour from the group comprising: triangle (50), semicircle (52), ellipse (54), rectangle (56) and/or square.
  9. 9. Electrical machine (100), in particular a permanently excited synchronous machine, which has a stator (10) according to one of the preceding claims, as well as a rotor (102) driven by the stator (10).

Description

Description title STATOR FOR AN ELECTRICAL MACHINE WITH A STATOR BODY State of the art The present invention relates to a stator for an electrical machine with a stator body and a vehicle. There are currently a variety of different solutions for the design of stators. Due to the increasing demands of electromobility and new application scenarios for electric motors, the need for innovative and robust stators is continuously increasing. The constant weight reduction in the vehicle sector to reduce fuel consumption as well as increasing competition is creating cost pressure, so that cheaper and more efficient components for vehicles are in greater demand. disclosure of the invention The stator for an electrical machine with a stator body with the features of claim 1 has the advantage over the known ones that with the help of the first recesses and the second recesses, a particularly low torque ripple and a high efficiency as well as low material and manufacturing costs can be achieved. More preferably, with the help of the design of the first recesses and the second recesses, a high torque and a high power can be achieved. This is achieved according to the invention in that the stator for an electrical machine is provided with a stator body, in particular a laminated core, which is arranged around a stator axis extends and comprises a plurality of stator teeth and a stator yoke connecting the plurality of stator teeth, wherein the plurality of stator teeth each have a tooth face for interacting with a rotor of the electrical machine at their tooth ends facing away from the stator yoke, in particular tooth heads, wherein recesses are formed on the tooth faces of at least several stator teeth, which have a depth in the radial direction with respect to the stator axis, a width in the circumferential direction and a length in the axial direction, wherein a first set of the stator teeth has first recesses and a second set of the stator teeth has second recesses, and that the first recesses and second recesses are designed differently with regard to at least one dimension, in particular the depth and/or width, and/or with regard to the shape. In other words, the stator teeth have different depressions on their tooth heads, so that a type of asymmetry can be created between the tooth heads. The plurality of stator teeth is arranged along a stator yoke, the stator yoke having in particular a circular cross-section. Further preferably, the plurality of stator teeth are arranged such that they are oriented from the stator yoke to a center of the stator yoke. Each of the plurality of stator teeth can have a tooth face facing away from the stator yoke. The tooth faces are in particular designed to interact with a rotor of the electric machine or to form a relative movement. Further preferably, each of the stator teeth has in particular a depression on its face. The depression has a depth in particular in the radial direction with respect to the stator axis, a width in the circumferential direction and a length in the axial direction. In other words, the depression on the tooth face has a three-dimensional geometry. Further preferably, the plurality of stator teeth can be divided into different groups. For example, a first group or a first set of stator teeth has a first type of depression and a second set of stator teeth has a second type of depression. It is also possible to form a plurality of groups, each of which has individual depressions. In particular, the first set of stator teeth with the first depressions differs from the second set of stator teeth with the second depressions in that the first depressions differ from the second depressions. For example, the first depression and/or the second Recess can be designed differently with regard to its geometric dimensions depth, width and/or shape. For example, the first recess has a first width, a first depth, a first length and a first cross-sectional contour, wherein the second recess has a second length, a second width, a second depth and a second cross-sectional shape, wherein at least one and/or all of these values can be different from one another. The subclaims show preferred developments of the invention. Preferably, the first depressions alternate with the second depressions around the stator axis of the stator. An advantage of this embodiment is that the alternation can be used to achieve good noise behavior of the electrical machine. For example, a stator tooth of the first set can be arranged at a first location. A stator tooth of the second set of stator teeth can be arranged adjacent to this stator tooth. A stator tooth of the first set can again be arranged adjacent to this, so that the first set of stator teeth alternates with the second set of stator teeth along the stator yoke around the stator axis. Preferably, the first recesses have a first depth, wherein the second recesses have a second depth, wherein the first depth is smaller than the secon