Stator iron core and the electric motor encompassing it

Abstract

The present invention provides a stator iron core and an electric motor comprising it. The stator iron core comprises a first stacked stator lamella segments. The first stator lamella segment has a first central bore and a first annular wall, on the outer circumference of which an arcuate recess is provided in the circumferential direction. The projections of the arcuate recesses of the first stator lamella segment and of the adjacent first stator lamella segments onto a plane perpendicular to the axis of the stator iron core overlap at least partially. The arcuate recesses of several of the first stator lamella segments are interconnected to form a spiral oil channel extending in the axial direction of the stator iron core.By forming the spiral oil channel in the stator iron core of the present invention through the arc-shaped recesses of the several stator lamella segments, and by forming axial oil holes through the holes of the stator lamella segments, the aforementioned structure increases the area and oil flow of a cooling oil circuit of the electric motor and simultaneously improves the uniformity of cooling and the cooling efficiency of the cooling oil channel.

Description

Technical field

[0001] The present invention relates to the technical field of electric motors, in particular a stator iron core and an electric motor comprising it. State of the art

[0002] With the development of electric vehicles, increasingly miniaturized electric motors are needed for the powertrain. Accordingly, the power density of electric motors has increased. However, this also presents a technical problem that urgently needs to be solved: the efficiency of heat dissipation in electric motors.

[0003] In current technology, electric motors are typically cooled by water cooling. However, the power density achievable with water cooling is low, and the non-insulating cooling water does not need to be in direct contact with the electric motor components, resulting in high thermal resistance in the water cooling system. Furthermore, water cooling requires a high degree of structural precision in the electric motor components. Oil cooling of the electric motor represents an alternative technical solution for heat dissipation.

[0004] It should be noted that the information above in the section “Prior Art” is only intended to improve the understanding of the background of the present invention and may therefore contain prior art information that is not known to the person skilled in the art. Disclosure of the invention

[0005] In view of the problems in the prior art, the object of the present invention is to provide a stator iron core and an electric motor comprising it. The stator iron core has several arcuate recesses in annular walls, which, together with an electric motor housing, form a cooling oil channel. This significantly increases the efficiency of heat dissipation from the electric motor, leading to improved operational stability and overall performance.

[0006] In the stator iron core of the present invention, the recess is shaped such that a portion of the annular wall of a stator lamella segment is removed. The recesses of the stacked stator lamella segments are then arranged spirally along an axis of the stator iron core. When this stator iron core is installed in the housing of the electric motor, several recesses form a continuous spiral oil channel. Furthermore, the holes formed in the annular walls create axial oil passages that connect to the spiral oil channel. This results in a uniform cooling effect, increasing the surface area and oil flow of the electric motor's cooling oil circuit, and thus improving the cooling efficiency of the cooling oil channel.

[0007] In a first aspect of the present invention, a stator iron core is provided comprising a first stacked stator lamella segments, wherein a is a natural number greater than 1, wherein the first stator lamella segment has a first central bore and a first annular wall, on the outer circumference of which an arcuate recess is provided in the circumferential direction, wherein the projections of the arc-shaped recesses of the first stator lamella segment and the adjacent first stator lamella segments each overlap at least partially onto a plane perpendicular to the axis of the stator iron core, and wherein The arc-shaped recesses of several of the first stator lamella segments are connected to each other to form a spiral oil channel extending in the axial direction of the stator iron core.

[0008] According to a first aspect of the present invention, it is provided that the first annular wall is provided with several first holes through the first annular wall on its outer circumference, apart from the arc-shaped recess.

[0009] According to a first aspect of the present invention, it is provided that the first hole has an axis that runs parallel to the axis of the stator iron core.

[0010] According to a first aspect of the present invention, the first hole is designed in the form of a circle, an ellipse, or a polygon. According to a first aspect of the present invention, the distance between adjacent first holes is the same in the circumferential direction.

[0011] According to a first aspect of the present invention, it is provided that the multiple first holes of the first stator lamella segment and the multiple first holes of the adjacent first stator lamella segments are connected to each other.

[0012] According to a first aspect of the present invention, it is provided that the projections of at least several first holes of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core fall into the projection of the arc-shaped recess of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core.

[0013] According to a first aspect of the present invention, it is provided that the first annular wall is provided on its inner circumference with Z stator slots, wherein Z is a natural number greater than 1, wherein the arc-shaped recess of the first stator lamella segment has an angle of θ and during lamination a rotation angle of any one of the first stator lamella segments relative to the first stator lamella segment adjacent from above is β, such that, If a = 2, the following relationship is satisfied: 0° < θ < 180, 0° < β < θ, β = n * 360° / Z, where n is a natural number ≥ 1, and if a > 2, the following relationship is satisfied: 360° / a < θ < 180° and 0° < β < θ, β = n * 360° / Z, wherein n is a natural number ≥ 1. According to a first aspect of the present invention, the stator iron core further comprises a second stator lamella segment at each of its two ends, wherein the second stator lamella segment has a second central bore and a second annular wall, wherein the second annular wall, which corresponds to the arc-shaped recess of the adjacent first stator lamella segment, is provided with a second hole that passes through the second annular wall.

[0014] According to a first aspect of the present invention, it is provided that the second hole has an axis that intersects the axis of the stator iron core.

[0015] In a second aspect of the present invention, an electric motor is provided which comprises the stator iron core described above.

[0016] According to a second aspect of the present invention, it is provided that the electric motor comprises a circular cylindrical housing, wherein the stator iron core is arranged in the housing, wherein the housing is provided with a penetrating oil inlet, wherein one end of the oil inlet is connected to the oil channel and the other end is used for connection to an external oil supply line.

[0017] According to a second aspect of the present invention, it is provided that one end of the oil inlet is connected to a central part of the oil channel, or that one end of the oil inlet is connected to the oil channel at one end of the stator iron core.

[0018] In a second aspect of the present invention, a semiconductor device is provided which is manufactured using the stator iron core according to the aforementioned first aspect.

[0019] In the stator iron core of the present invention, the arc-shaped recess is formed such that a portion of the annular wall of a stator lamella segment is removed. The recesses of the individual stacked stator lamella segments are then arranged spirally along an axis of the stator iron core. When the stator iron core is installed in the housing of the electric motor, several arc-shaped recesses form a continuous spiral oil channel. Furthermore, the holes formed in the annular walls create axial oil holes that connect to the spiral oil channel. Therefore, the spiral oil channel and the axial oil holes in the stator iron core according to the invention increase the surface area and oil flow of the electric motor's cooling oil circuit, while simultaneously improving the uniformity of the cooling and the cooling efficiency of the cooling oil channel. Brief description of the characters

[0020] Further features, tasks and advantages of the present invention will become clearer by reading the detailed description of the non-restrictive embodiments with reference to the following accompanying drawings. Fig. Figure 1 shows an exploded view of a stator iron core according to a first embodiment of the present invention; Fig. Figure 2 shows a schematic representation of the structure of a first stator lamella segment according to an embodiment of the present invention; Fig. Figure 3 shows a schematic representation of a section of the first stator lamella segment according to the embodiment shown in Fig. 2; Fig. 4 and Fig. Figures 5 each show a schematic representation of the structure of a stator iron core according to a second embodiment of the present invention; Fig. Figure 6 shows a schematic representation of the structure of a second stator lamella segment according to an embodiment of the present invention; Fig. Figure 7 shows a cross-sectional view of the second stator lamella segment along line EE according to the embodiment shown in Figure 7. Fig. 6; Fig. Figure 8 shows a schematic representation of the structure of an oil channel of an electric motor according to a third embodiment of the present invention; Fig. Figure 9 shows a schematic representation of the structure of an oil channel of an electric motor according to a fourth embodiment of the present invention; Fig. Figure 10 shows a schematic representation of the structure of an oil channel of an electric motor according to a fifth embodiment of the present invention; and Fig. Figure 11 shows a schematic representation of the structure of an oil channel of an electric motor according to a sixth embodiment of the present invention. Detailed descriptions

[0021] The embodiments of the present invention are explained below by means of specific, detailed examples. The other advantages and effects of the present invention will be readily apparent to a person skilled in the art from the content disclosed herein. The present invention can also be implemented or applied in various other specific embodiments. Various modifications or changes to individual details of the present invention can also be made, based on different considerations and application systems, without departing from the spirit of the present invention. It should be noted that the exemplary embodiments and features of the present invention can be combined without conflict.

[0022] With reference to the accompanying drawings, the exemplary embodiments of the present invention are described in detail below so that they can be easily implemented by a person skilled in the technical field of the present invention. The present invention can be implemented in many different forms and is not limited to the exemplary embodiments described here.

[0023] In the descriptions of the present invention, terms such as "an embodiment," "some embodiments," "examples," "specific examples," or "some examples" should be interpreted such that specific features, structures, materials, or properties illustrated by reference to the embodiment or example are encompassed by at least one embodiment or example of the present invention. Furthermore, the illustrated specific features, structures, materials, or properties can be suitably combined with one another within any or more embodiments or examples. A person skilled in the art can also combine or synthesize different embodiments or examples, as well as the features of the different embodiments or examples illustrated in the present invention, without them contradicting one another.

[0024] Furthermore, the terms "first" and "second" are used for illustrative purposes only, without indicating or suggesting the relative importance or number of the technical features involved. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the word "more" means two or more than two, unless expressly defined otherwise.

[0025] To clearly illustrate the present invention, devices not relevant to the description are omitted, and identical or similar components are identified by the same reference numerals throughout the description. Whenever the description refers to a device being "connected" to another, this includes not only a "direct connection" but also an "indirect connection" through the arrangement of other elements between these devices. Furthermore, whenever a device is described as "encompassing" a particular component, this does not mean that other components are excluded. Rather, it means that other components may be included unless specifically noted to the contrary.

[0026] When a device is described as being "on" another device, it can either be placed directly on top of the other device, or other devices can be present in between. Conversely, if a device is "directly" on top of another device, there are no other devices in between.

[0027] It is understood that, despite the use of terms like "first," "second," etc., to describe different elements, such elements should not be restricted by these terms. Such terms merely serve to distinguish one element from another. For example, a first connection and a second connection, etc., are shown. Furthermore, terms like "a," "an," "these," and other expressions used here that suggest the singular form should also include the plural form unless otherwise indicated in the context.It should be further understood that the terms "contain" and "include" indicate the presence of a feature, step, process, element, component, object, type, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, steps, processes, elements, components, objects, types, and / or groups. The expressions "or" and "and / or" used here are to be interpreted as encompassing everything or any combination thereof. Thus, "A, B, or C" or "A, B, and / or C" means "one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." An exception to this definition exists only where combinations of elements, functions, steps, or processes are inherently mutually exclusive in a particular way.

[0028] The technical terms used herein are employed only in relation to specific embodiments and are not intended to limit the invention. The singular form used here also includes the plural form unless the expression explicitly indicates otherwise. The term "comprise" used in the description is intended to specify certain properties, regions, integers, steps, operations, elements, and / or components; however, the presence or addition of other properties, regions, integers, steps, operations, elements, and / or components is not thereby excluded.

[0029] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art in the field of the present invention. Terms defined in common dictionaries are further interpreted to have a meaning consistent with the content of relevant technical literature and current references, and they must not be overinterpreted to acquire an ideal or highly formulaic meaning unless explicitly defined.

[0030] To overcome the aforementioned technical problems, the present invention provides a stator iron core and an electric motor comprising it, wherein the stator iron core includes a first stacked stator lamella segments, the first stator lamella segment having a first central bore and a first annular wall with an arcuate recess on its outer circumference. The projections of the arcuate recesses of the first stator lamella segment and those of the adjacent first stator lamella segments overlap at least partially onto a plane perpendicular to the axis of the stator iron core. Furthermore, the arcuate recesses of several of the first stator lamella segments are interconnected to form a spiral oil channel extending axially along the stator iron core.In the stator iron core of the present invention, the arc-shaped recess is formed such that a portion of the annular wall of a stator lamella segment is removed. The recesses of the individual stacked stator lamella segments are then arranged spirally along an axis of the stator iron core. When the stator iron core is installed in the housing of the electric motor, several arc-shaped recesses form a continuous spiral oil channel. Furthermore, the holes formed in the annular walls create axial oil holes that connect to the spiral oil channel. Therefore, the spiral oil channel and the axial oil holes in the stator iron core according to the invention increase the surface area and oil flow of the electric motor's cooling oil circuit, while simultaneously improving the uniformity of the cooling and the cooling efficiency of the cooling oil channel.The stator iron core and the electric motor comprising it of this utility model will be discussed in more detail below with reference to the accompanying drawings and detailed embodiments. It should be understood that each specific embodiment is not to be considered a limitation of the scope of protection of this utility model.

[0031] Fig. Figure 1 shows an exploded view of a stator iron core according to a first embodiment of the present invention. In particular, the stator iron core comprises a first stacked stator lamella segments 1, where a is a natural number > 1. It should be noted that the stator lamella segments mentioned herein are in turn formed by several structurally identical stator lamellae laminated one on top of the other.

[0032] Fig. Figure 2 shows a schematic representation of the structure of a first stator lamella segment according to an embodiment of the present invention. The first stator lamella segment 1 has a first central bore H1 and a first annular wall 11, wherein the inner circumference of the first annular wall 11 is provided with first stator slots 112 and the outer circumference of the first annular wall 11 is provided with an arcuate recess C in the circumferential direction. Fig. Figure 3 shows a schematic representation of a section of the first stator lamella segment from Fig. 2 in the area of ​​the dashed block. The arc-shaped recess C can be formed such that an arc-shaped part is removed from the outer circumference of the first annular wall 11. In the embodiment shown in Fig. 2. The arc width W of the arc-shaped recess C is identical in the circumferential direction, i.e., the arc-shaped recess C has an outer arc radius R1 and an inner arc radius R2, where radius R1 is greater than radius R2. The outer and inner arcs share the center of the circle, and the outer and inner arcs have the same central angle. In some other embodiments, the arc width of the arc-shaped recess C may not be identical. In these cases, the arc width of the arc-shaped recess C may be determined as a function of the depth of the oil channel formed by its mounting to the inner wall of the electric motor housing.

[0033] In the lamination of the several first stator lamella segments 1 of the stator iron core according to the invention, the two adjacent first stator lamella segments are rotated relative to each other, see Fig. Figure 1 shows an exploded view of the multiple first stator lamination segments, i.e., the arcuate recesses C of the two adjacent first stator lamination segments do not completely overlap. However, the projections of the arcuate recesses C of the first stator lamination segment 1 and the adjacent first stator lamination segments each overlap at least partially on a plane perpendicular to the axis XX of the stator iron core. The above arrangement ensures that the two arcuate recesses C of the two adjacent first stator lamination segments can be connected to each other, or that these two arcuate recesses C are in contact with each other. Therefore, the respective oil channel segments of the two arcuate recesses C are in contact with each other when an oil channel is formed by assembling the two arcuate recesses C with the inner wall of the electric motor housing.Accordingly, the arc-shaped recesses C of several of the first stator lamella segments 1 are connected to each other in order to thus create the axial direction of the stator iron core (i.e. a direction XX in . Fig. 1) to form an extending, spiral oil channel. More precisely, the adjacent arc-shaped recesses C are connected to each other in the circumferential direction of the stator iron core, so that the individual arc-shaped recesses C form the spiral oil channel that extends in the axial direction of the stator iron core.

[0034] It should be noted that the respective stator slots of the two adjacent first stator lamella segments must overlap during relative rotation and stacking. Furthermore, it is provided that the first annular wall 11 is provided on its inner circumference, for example, with Z first stator slots 112, where Z is a natural number greater than 1, and where the arcuate recess C of the first stator lamella segment has an angle, i.e., an arc angle, of θ, see [reference]. Fig. 2. During lamination, any one of the first stator lamella segments has a rotation angle of β (not shown in the figures) relative to the first stator lamella segment adjacent from above, such that if a = 2, i.e., if the stator iron core comprises two first stator lamella segments, the following relationship must be satisfied: 0° < θ < 180, 0° < β < θ, β = n * 360° / Z, where n is a natural number ≥ 1. The 0° < β < θ ensures that the arc-shaped recesses C of the two stacked first lamination segments have an overlapping section, thus creating an oil channel through the connection of the upper and lower arc-shaped recesses C. Simultaneously, β = n * 360° / Z ensures that the stator slots of the stacked first lamination segments are aligned with each other, ultimately forming the stator iron core applicable in the electric motor.

[0035] If a > 2, i.e., if the stator iron core includes more than two first stator lamella segments, the following relationship must be satisfied: 360° / a < θ < 180° and 0° < β < θ, β = n * 360° / Z, where n is a natural number ≥ 1.

[0036] It should be noted that for more than two first stator lamination segments, the above condition is such that the rotation angle β of each adjacent first stator lamination segment is equal with respect to the preceding first stator lamination segment. In a practical application, for a stator iron core, the rotation angle of each adjacent first stator lamination segment with respect to the preceding first stator lamination segment may not be equal as long as the two arc-shaped recesses C of the two adjacent first stator lamination segments partially overlap when stacked and the stator slots of the adjacent first stator lamination segments completely overlap.

[0037] In the first embodiment, the spiral oil channel, which extends axially along the stator iron core and is formed by connecting the several arc-shaped recesses C, can serve to cool the electric motor. To further improve the cooling effect of the oil channel, some embodiments provide that the first annular wall 11, apart from the arc-shaped recess C, is provided with several first holes 111 through its outer circumference. The first hole 111 can be in the form of a circle, an ellipse, or a polygon. Since the oil channel formed by connecting the several arc-shaped recesses C extends axially along the stator iron core, one axis of the first hole 111 preferably runs parallel to the axis of the stator iron core.Simultaneously, the first several holes 111 of the first stator lamella segment and the first several holes 111 of the adjacent first stator lamella segments are connected to each other. Now, parallel to the axial direction (i.e., the XX direction of ). Fig. 1) a straight oil hole channel is formed in the stator iron core, which runs through the first several stator lamella segments.

[0038] Furthermore, it is provided that the projections of at least several first holes of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core coincide with the projection of the arcuate recess of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core. That is, if the two first stator lamella segments are rotated relative to each other by a certain angle during stacking, at least partially the first holes 111 of the first annular wall 11 of one first stator lamella segment 1 are connected to the arcuate recess C of the other first stator lamella segment 1. Structurally, the perpendicular distance between the first holes 111 and the axis of the stator iron core must be greater than the perpendicular distance between an outer circumferential section of the first annular wall of the first stator lamella segment 1, which is provided with the arcuate recess C, and the axis of the stator iron core.Alternatively, the radius of a region of the first annular wall, which is provided with the first holes, is larger than the radius of a region of the first annular wall, which is provided with the arcuate recess C. This structure ensures the flow of coolant from the recess through the spiral oil channel into the axial straight channel.

[0039] The shape and number of the first holes 111 can be determined according to the structure of the specific stator iron core, without limitation. Preferably, the distance between adjacent first holes 111 is equal in the circumferential direction; that is, the multiple first holes 111 are arranged uniformly in the circumferential direction around an outer circumferential section of the first annular wall 11 that is not provided with the arcuate recess C. The uniformly distributed first holes 111 allow for more uniform cooling of the electric motor and reduce the risk of localized heating.

[0040] In the stator iron core according to the invention, the coolant flows from the recess partly along the spiral oil channel and partly along the straight axial channel, thereby obtaining a cooling oil channel with increased cooling efficiency. Simultaneously, the stator iron core can be formed from several first stator lamella segments with the same structure by twisting and stacking, thereby reducing the types of lamella segments, simplifying manufacturing, and significantly reducing the manufacturing costs of the stator iron core.

[0041] Fig. 4 and Fig. Figures 5 show a schematic representation of the structure of a stator iron core according to a second embodiment of the present invention from different angles. Unlike the first embodiment, the stator iron core further comprises a second stator lamella segment 2 at each end. The second stator lamella segment 2 has a second central bore H2 and a second annular wall 21. The second annular wall 21 is also provided with second stator slots 212 on its inner circumference. In addition, the second central bore H2 is structurally adapted to the first central bore H1, and the number / structure of the second stator slots 212 is adapted to the number / structure of the first stator slots 112. The second annular wall 21, which corresponds to the arc-shaped recess of the adjacent first stator lamella segment, is provided with second holes 211.This means that the projection of the second annular wall 21, which is provided with the second holes 211, and the projection of the arcuate recess of the adjacent first stator lamella segment, each onto a plane perpendicular to the axis XX of the stator iron core, overlap. The above arrangement allows the connection of the second hole 211 with the arcuate recess C of the adjacent first stator lamella segment 1. The second hole 211 penetrates the second annular wall 21. The second hole 211 can be in the form of a circle, an ellipse, or a polygon. The shape and number of the second holes 211 can be determined according to the structure of the specific stator iron core. The multiple second holes 211 can be evenly distributed around the outer circumference of the second annular wall 21 of the part.

[0042] Fig. Figure 7 shows a cross-sectional view of the second stator lamella segment along line EE according to the embodiment shown in Figure 7. Fig. 6. The second hole 211 has an axis pp that intersects the axis of the stator iron core, and the line X'X' in Fig. Figure 7 represents the axis XX of the stator iron core. The second hole 211 is used for injecting oil towards the end of the winding and can be machined using a drill or laser cutting process.

[0043] The present invention further provides an electric motor comprising the stator iron core described above and a circular cylindrical housing in which the stator iron core is arranged. The housing is provided with a penetrating oil inlet 3, one end of which is connected to the oil channel and the other end of which serves to connect to an external oil supply line. Fig. Figure 8 shows a schematic representation of the structure of an oil channel of an electric motor according to a third embodiment of the present invention. It can be seen that five first stator lamella segments form a cycle, wherein the arc-shaped recesses of the five first stator lamella segments are arc-shaped recess C1, arc-shaped recess C2, arc-shaped recess C3, arc-shaped recess C4, and arc-shaped recess C5, and wherein the lower first stator lamella segment is rotated by 90° relative to the upper first stator lamella segment. The oil inlet 3 is arranged on the central section of the stator iron core and is connected to the oil channel formed by the arc-shaped recesses. In the third embodiment, the first stator lamella segment is provided with first holes 111, wherein the first holes 111 are distributed along one direction of the axis of the stator iron core.During operation of the electric motor, cooling oil from the external oil supply line enters the oil channel formed by the recesses of the stator iron core and the housing through the oil inlet 3 and flows along this oil channel formed by the recesses and the housing as well as the oil channel formed by the first hole to the two ends of the stator iron core, thereby cooling the electric motor.

[0044] Fig. Figure 9 shows a schematic representation of the structure of an oil channel of an electric motor according to a fourth embodiment of the present invention.

[0045] It can be seen that four first stator lamella segments also form a cycle, with the arc-shaped recesses of the four first stator lamella segments being arc-shaped recess C1, arc-shaped recess C2, arc-shaped recess C3, and arc-shaped recess C4. The oil inlet 3 is located on the central section of the stator iron core. Unlike the third embodiment, however, the lower first stator lamella segment on one side of the oil inlet 3 is rotated 90° relative to the upper first stator lamella segment. The lower first stator lamella segment on the other side of the oil inlet 3 is rotated -90° relative to the upper first stator lamella segment. This means that the first stator lamella segments on both sides of the oil inlet 3 are rotated in opposite directions relative to each other.

[0046] Fig. Figure 10 shows a schematic representation of the structure of an oil channel of an electric motor according to a fifth embodiment of the present invention.

[0047] Unlike the third embodiment, the stator iron core in the fifth embodiment comprises several first stator lamella segments and several second stator lamella segments, each located at both ends of the first stator lamella segments. Accordingly, an oil channel facing the winding is provided at both ends of the stator iron core, formed by the second holes 211.

[0048] Fig. Figure 11 shows a schematic representation of the structure of an oil channel of an electric motor according to a sixth embodiment of the present invention.

[0049] Here, the structure of the stator iron core is the same as in the fifth embodiment, with the difference that one end of the oil inlet 3a, provided by the housing, is connected to the oil channel at one end of the stator iron core.

[0050] Although exemplary embodiments of the present invention have been shown and described above, it should be clear that these embodiments are exemplary and should not be understood as limiting the present invention. A person skilled in the art can make various modifications, substitutions, and variations of the above exemplary embodiments within the scope of the present invention. The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments and should not be considered limiting the specific embodiment of the present invention.For the average person skilled in the art in the field to which the present invention belongs, several simple derivations or substitutions can be carried out without deviating from the concept of the present invention, which should be covered by the scope of protection of the present invention.

Claims

[1] Stator iron core, characterized by , that it comprises a first stacked stator lamella segments, where a is a natural number greater than 1, where the first stator lamella segment has a first central bore and a first annular wall, on the outer circumference of which an arcuate recess is provided in the circumferential direction, wherein the projections of the arc-shaped recesses of the first stator lamella segment and the adjacent first stator lamella segments each overlap at least partially onto a plane perpendicular to the axis of the stator iron core, and wherein The arc-shaped recesses of several of the first stator lamella segments are connected to each other to form a spiral oil channel extending in the axial direction of the stator iron core. [2] Stator iron core according to claim 1, characterized by, that the first annular wall is provided with several first holes through the first annular wall on its outer circumference, apart from the arc-shaped recess. [3] Stator iron core according to claim 2, characterized by , that the first hole has an axis that runs parallel to the axis of the stator iron core. [4] Stator iron core according to claim 2, characterized by , that the first hole is formed in the shape of a circle, an ellipse or a polygon. [5] Stator iron core according to claim 2, characterized by , that the distance between the adjacent first holes is the same in the circumferential direction. [6] Stator iron core according to claim 2, characterized by , that the multiple first holes of the first stator lamella segment and the multiple first holes of the adjacent first stator lamella segments are connected to each other. [7] Stator iron core according to claim 2, characterized by, that the projections of at least several first holes of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core fall into the projection of the arc-shaped recess of the first stator lamella segment onto the plane perpendicular to the axis of the stator iron core. [8] Stator iron core according to claim 1, characterized by , that the first annular wall is provided with Z stator slots on its inner circumference, where Z is a natural number greater than 1, wherein the arc-shaped recess of the first stator lamella segment has an angle of θ and during lamination a rotation angle of any one of the first stator lamella segments relative to the first stator lamella segment adjacent from above is β, such that, If a = 2, the following relationship is satisfied: 0° < θ < 180, 0° < β < θ, β = n * 360° / Z, where n is a natural number ≥ 1, and if a > 2, the following relationship is satisfied: 360° / a < θ < 180° and 0° < β < θ, β = n * 360° / Z, where n is a natural number ≥ 1. [9] Stator iron core according to claim 1, characterized by , that the stator iron core further comprises a second stator lamella segment at each end, wherein the second stator lamella segment has a second central bore and a second annular wall, wherein the second annular wall, which corresponds to the arc-shaped recess of the adjacent first stator lamella segment, is provided with a second hole that passes through the second annular wall. [10] Stator iron core according to claim 9, characterized by , that the second hole has an axis that intersects the axis of the stator iron core. [11] Electric motor, characterized by that it comprises a stator iron core according to any one of claims 1 to 10. [12] Electric motor according to claim 11, characterized by, that the electric motor comprises a circular cylindrical housing, wherein the stator iron core is arranged in the housing, wherein the housing is provided with a penetrating oil inlet, wherein one end of the oil inlet is connected to the oil channel and the other end is used for connection to an external oil supply line. [13] Electric motor according to claim 12, characterized by , that one end of the oil inlet is connected to a central part of the oil channel, or that one end of the oil inlet is connected to the oil channel at one end of the stator iron core.

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