Stator for an electric machine having a stator body

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.

Description

[0001] Description

[0002] title

[0003] STATOR FOR AN ELECTRICAL MACHINE WITH A STATOR BODY

[0004] State of the art

[0005] The present invention relates to a stator for an electrical machine with a stator body and a vehicle.

[0006] There are currently a multitude of different solutions for stator design. Due to the increasing demands of electromobility and new application scenarios for electric motors, the demand for innovative and robust stators is continuously growing.

[0007] The constant weight reduction in the vehicle sector to reduce fuel consumption as well as increasing competition are creating cost pressure, so that cheaper and more efficient components for vehicles are in greater demand.

[0008] Disclosure of the invention

[0009] The stator for an electrical machine with a stator body having the features of claim 1 has the advantage over the known devices that, with the aid of the first recesses and the second recesses, a particularly low torque ripple and high efficiency, as well as low material and manufacturing costs, can be achieved. Further preferably, with the aid of the design of the first recesses and the second recesses, a high torque and high power can be achieved.

[0010] This is achieved according to the invention in that the stator for an electrical machine has a stator body, in particular a laminated core, which extends around a stator axis and comprises a plurality of stator teeth and a stator yoke connecting the plurality of stator teeth, wherein the plurality of stator teeth have, at their tooth ends facing away from the stator yoke, in particular tooth tips, each a tooth end face for interacting with a rotor of the electrical machine, wherein recesses are formed on the tooth end 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 with respect to at least one dimension, in particular the depth and / or width,and / or are designed differently in terms of shape.,

[0011] In other words, the stator teeth have different depressions on their tooth tips, so that a type of asymmetry can be created between the tooth tips. The plurality of stator teeth is arranged along a stator yoke, wherein the stator yoke has, 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 point of the stator yoke. Each of the plurality of stator teeth can have a tooth end facing away from the stator yoke. The tooth end 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 end face.The recess has a depth, particularly in the radial direction relative to the stator axis, a width in the circumferential direction, and a length in the axial direction. In other words, the recess on the tooth end face has a three-dimensional geometry. More 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 recess, and a second set of stator teeth has a second type of recess. More preferably, a plurality of groups can also be formed, each having individual recesses. In this case, the first set of stator teeth with the first recesses differs in particular from the second set of stator teeth with the second recesses in that the first recesses differ from the second recesses.For example, the first recess and / or the second recess can be configured differently with regard to their geometric dimensions of 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, while 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.

[0012] The subclaims show preferred developments of the invention.

[0013] Preferably, the first recesses alternate with the second recesses around the stator axis of the stator. One advantage of this embodiment is that the alternation allows for good noise behavior of the electric 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 stator tooth, so that the first set of stator teeth alternates with the second set of stator teeth along the stator yoke around the stator axis.

[0014] Preferably, the first depressions have a first depth, wherein the second depressions have a second depth, wherein the first depth is smaller than the second depth. It is advantageous that the first depth and the second depth can be specifically adjusted on the starter head using a simple separating manufacturing process. For example, the first depth can be formed on the first stator tooth and the second depth on the second stator tooth using a punching, milling, sawing or grinding machine or the like. More preferably, all first depressions on all stator teeth of the first set can be formed with the first depth using the same process. Furthermore, all second depressions of the second set of stator teeth can be formed using the same process.

[0015] Preferably, the second depth is less than 0.8 times the height of a tip region of the stator teeth, optionally of the second set. This advantageously allows for consistent symmetry to be achieved between the first stator tooth set and the second stator tooth set, thus achieving particularly low torque ripple. In particular, both the first depth and the second depth can be configured to be dependent on the surface of the tooth tip at the deepest point of the recess.

[0016] Preferably, the first depressions have a first opening angle, wherein the second depressions have a second opening angle, wherein the first opening angle is smaller than the second opening angle. One advantage of this embodiment is that the opening angle on the stator teeth can be used to specifically adjust how the acoustic properties of the stator develop in interaction with a rotor. The first opening angle can be determined in particular based on two flank surfaces of the first depressions of the first set of stator teeth. More preferably, the second depressions have a second opening angle, which is formed in particular between two flank surfaces of the second depressions of the second set of stator teeth.

[0017] More preferably, the second opening angle is smaller than 0.8 times the angle of incidence of a tooth end face of the second recesses relative to the stator axis of the stator. This makes it possible to achieve a particularly high level of efficiency with this ratio. The angle of incidence of the end face is formed, in particular, between two lines. The first line connects a first edge to the center of the stator yoke, and the second line connects a second edge to the center of the stator yoke, with the first edge being formed on a first side of the recess and the second edge being formed on a second edge of the recess. The angle of incidence can be formed, in particular, as a function of the width of the recesses. Furthermore, the second opening angle can be 0.8 times smaller than the angle of incidence formed, for example, by a width of the first recesses on a stator tooth of the first set.

[0018] More preferably, the first recesses have a first contour, while the second recesses have a second contour, wherein the first contour and the second contour differ from one another. As a result, the first contour is matched to the second contour, for example, to simplify the manufacturing process of the stator tooth accordingly. For example, the first recesses of the first set of stator teeth can have a first contour or a first cross-sectional shape. Furthermore, the second recesses of the second set of stator teeth can have a second contour or cross-sectional area.

[0019] Preferably, the first contour and the second contour comprise at least one contour selected from the group consisting of triangle, semicircle, ellipse, rectangle, and / or square. An advantage of this embodiment is that, depending on the application scenario of the stator teeth, the contour or cross-sectional shape of the first and / or second recesses can be specifically adjusted.

[0020] The invention also relates to an electric machine, in particular a permanent magnet synchronous machine. The electric machine has a stator as described above and a rotor driven by the stator. The electric machine is in particular an electric drive unit for a vehicle.

[0021] Short description of the drawings

[0022] Embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawing:

[0023] Figure 1 shows an electrical machine according to an embodiment of the invention,

[0024] Figure 2 shows a first alternative of the stator of the electric machine according to the embodiment of the invention,

[0025] Figure 3 shows a second alternative of the stator of the electric machine according to the embodiment of the invention,

[0026] Figure 4 shows a third alternative of the stator of the electric machine according to the embodiment of the invention, and

[0027] Figure 5 shows a fourth alternative of the stator of the electrical machine according to the embodiment of the invention.

[0028] Embodiments of the invention Figure 1 shows an electric machine 100 having a stator 10 and a rotor 102. The stator 10 is designed to drive the rotor 102. The stator 10 extends around a stator axis 34, which corresponds to a rotational axis of the rotor 102.

[0029] Figure 2 shows a stator 10 according to a first alternative. The stator 10 is designed to be arranged in the electric machine 100. The stator 10 has a stator body 12 and a plurality of stator teeth 14. The plurality of stator teeth 14 is arranged in particular on a stator yoke 15 connecting them. The stator teeth 14 also comprise tooth ends 16. Tooth end faces 18 are arranged at the tooth ends 16. Furthermore, at least several recesses 20 are formed on the tooth end faces 18. The recesses 20 have a depth 22 in the radial direction with respect to the stator axis 34. Furthermore, the recess 20 has a width 23 in the circumferential direction and a length 25 in the axial direction. A first set of stator teeth 24 has first recesses 27, while a second set of stator teeth 26 has second recesses 29.Preferably, the first recesses 27 are designed differently from the second recesses 29.

[0030] Figure 3 shows a stator 10 according to a second alternative. The stator tooth 14 of the first set 24 with the first recess 27 has a first contour 46, which is designed as an ellipse 54. The stator tooth 14 of the second set 26 with the second recess 29 has a second contour 48, which is designed as a triangle 50. Furthermore, different shapes, such as the triangle 50 with the ellipse 54, or similar, can also be combined.

[0031] Figure 4 shows a stator 10 according to a third alternative. The first recess 27 on the stator tooth 14 of the first set 24 has a first contour 46, which, as shown in Figure 4, is formed as a rectangle. Furthermore, the stator tooth 14 of the second set 26 has a second recess 29. As shown in Figure 4, the second recess 29 is formed with a second contour 48 as a rectangle 56.

[0032] Figure 5 shows a stator 10 according to a fourth alternative. As illustrated in Figure 5, the first recesses 27 alternate with the second recesses 29 around the stator axis 34 of the stator 10. For example, the first recesses 27 are arranged on the stator tooth 14 of the first set 24. Furthermore, the second recesses 29 are arranged on the stator 10 of the second set 26. The first recesses 27 have a first depth 34, while the second recesses 29 have a second depth 36. In addition, a head region 40 is arranged on each of the plurality of stator teeth 14.

[0033] In this case, a height 38 of the head region 40 can be, in particular, 0.8 times smaller than the second depth 36. Furthermore, the first recess 27 has a first opening angle 42. The second recess 29 has a second opening angle 44. Preferably, the first opening angle 42 is smaller than the second opening angle 44. Furthermore, the second opening angle 44 is, in particular, 0.8 times smaller than an angle of incidence 46 of a tooth end face of the second recesses 29 with respect to the stator axis 34 of the stator 10.

Claims

Claims 1. A stator (10) for an electrical machine (100) having 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, at their tooth ends (16) facing away from the stator yoke (15), in particular tooth tips, a tooth end face (18) for interacting with a rotor (102) of the electrical machine (100), wherein recesses (20) are formed on the tooth end faces (18) of at least several stator teeth, which recesses 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 thatthat a first set of 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. 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. 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. 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. 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. Stator (10) according to claim 5, wherein the second opening angle (44) is less than 0.8 times an angle of incidence (46) of a tooth end face of the second recesses (29) with respect to the stator axis (34) of the stator (10).

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. 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. Electrical machine (100), in particular a permanent magnet synchronous machine, which has a stator (10) according to one of the preceding claims, and a rotor (102) driven by the stator (10).

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