Stator core and motor comprising same

Abstract

The utility model provides a stator iron core and a motor comprising the same, the stator iron core comprises a first stator punching sheet sections which are laminated, each first stator punching sheet section is provided with a first center hole and a first annular wall, and the periphery of the first annular wall is provided with an arc-shaped groove along the circumferential direction; the projection of the arc-shaped groove of the first stator punching sheet section on a plane perpendicular to the axis of the stator core is at least partially overlapped with the projection of the arc-shaped groove of the first stator punching sheet section on an adjacent layer on a plane perpendicular to the axis of the stator core; and the plurality of arc-shaped grooves of the plurality of first stator punching sheet sections are communicated and form a spiral oil duct extending along the axial direction of the stator iron core. According to the utility model, the arc-shaped grooves of the plurality of stator punching segments of the stator core form the spiral oil duct, and the holes of the stator punching segments form the axial oil holes, so that the area and the oil flow of a refrigeration oil path of the motor are increased, the cooling effect is uniform, and the cooling efficiency of the cooling oil duct is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core and a motor comprising the same. Background Art

[0002] With the development of electric vehicles, the demand for miniaturization of motors in their powertrains has been increasing. Correspondingly, the power density of motors has also been improved. As the power density increases, the heat dissipation efficiency of motors has become a technical problem that needs to be solved urgently.

[0003] In existing technologies, motors usually use water cooling technology to dissipate heat. However, the power density of water cooling is low, and since the cooling water has no insulation, it cannot directly contact the motor components, resulting in a large thermal resistance of the water cooling link. In addition, water cooling technology has high requirements on the structural accuracy of the motor components. Oil cooling technology is an alternative technical solution for dissipating heat from the motor.

[0004] It should be noted that the information of the utility model in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to those skilled in the art. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of the utility model is to provide a stator core and a motor including the same. The stator core is composed of a plurality of arc-shaped grooves arranged on the annular wall and a cooling oil channel formed with the motor housing, which greatly improves the heat dissipation efficiency of the motor, thereby improving the stability of the motor operation and the overall performance of the motor.

[0006] The stator core of the utility model forms grooves by cutting off part of the annular wall of the stator punch segment, and the grooves of the stacked stator punch segments are arranged spirally along the axis of the stator core. When it is arranged in the housing of the motor, a plurality of grooves form connected spiral oil channels. At the same time, holes are arranged in the annular wall to form axial oil holes connected to the spiral oil channels, which increases the area and oil flow of the motor cooling oil circuit while improving the uniformity of the cooling effect, thereby better improving the cooling efficiency of the cooling oil channel.

[0007] A first aspect of the utility model provides a stator core, comprising a stacked first stator punch segments, where a is a natural number greater than 1;

[0008] The first stator punch segment has a first central hole and a first annular wall, and the outer periphery of the first annular wall is provided with an arc-shaped groove along the circumferential direction;

[0009] The projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core at least partially overlaps with the projection of the arc-shaped groove of the first stator punch segment of an adjacent layer on a plane perpendicular to the axis of the stator core;

[0010] The plurality of arc-shaped grooves of the plurality of first stator punch segments are connected to form a spiral oil passage extending along the axial direction of the stator core.

[0011] According to a first aspect of the utility model, a plurality of first holes penetrating through the first annular wall are provided on the outer circumference of the first annular wall except the arc-shaped groove.

[0012] According to a first aspect of the present invention, an axis of the first hole is parallel to an axis of the stator core.

[0013] According to a first aspect of the present invention, the first hole is circular, elliptical or polygonal.

[0014] According to a first aspect of the present utility model, the circumferential spacing between adjacent first holes is equal.

[0015] According to a first aspect of the present utility model, the plurality of first holes of the first stator punching segment are communicated with the plurality of first holes of the first stator punching segment of an adjacent layer.

[0016] According to a first aspect of the utility model, the projection of at least a plurality of first holes of the first stator punch segment on a plane perpendicular to the axis of the stator core falls within the projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core.

[0017] According to the first aspect of the utility model, the inner circumference of the first annular wall is provided with Z stator slots, where Z is a natural number greater than 1;

[0018] The angle of the arc groove of the first stator punch segment is θ, and the rotation angle of any first stator punch segment relative to the first stator punch segment adjacent thereto during stacking is β, then:

[0019] When a=2, it satisfies:

[0020] 0°<θ<180, 0°<β<θ, β=n*360° / Z, n is a natural number ≥1;

[0021] When a>2, it satisfies:

[0022] 360° / a<θ<180°, and 0°<β<θ, β=n*360° / Z, where n is a natural number ≥1.

[0023] According to the first aspect of the utility model, the stator core further includes second stator punching segments at both ends;

[0024] The second stator punch segment has a second central hole and a second annular wall;

[0025] A second hole is arranged on the second annular wall corresponding to the arc-shaped groove of the adjacent first stator punch segment, and the second hole penetrates the second annular wall.

[0026] According to a first aspect of the present utility model, an axis of the second hole intersects with an axis of the stator core.

[0027] A second aspect of the utility model provides a motor, comprising the stator core.

[0028] According to a second aspect of the utility model, the motor comprises a cylindrical housing;

[0029] The stator core is arranged in the housing;

[0030] The shell is provided with an oil inlet which passes through the shell. One end of the oil inlet is connected to the oil channel, and the other end is used to be connected to an external oil supply pipe.

[0031] According to a second aspect of the utility model, one end of the oil inlet is connected to the oil passage in the middle portion, or one end of the oil inlet is connected to the oil passage at one end of the stator core.

[0032] The second aspect of the present invention provides a semiconductor device, which is prepared by using the stator core provided by the first aspect.

[0033] The stator core of the utility model forms arc grooves by cutting off part of the annular wall of the stator punch segment, and at the same time, when each stator punch segment is stacked, its grooves are arranged in a spiral along the axis of the stator core. When the stator core is set in the housing of the motor, a plurality of arc grooves form connected spiral oil passages. Furthermore, the holes arranged on the annular wall of the stator punch segment form axial oil holes connected to the spiral oil passages. The spiral oil passages and axial oil holes of the stator core of the utility model increase the area and oil flow of the motor cooling oil circuit. At the same time, the cooling effect is uniform and the cooling efficiency of the cooling oil passage is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0035] Figure 1 An exploded view of the stator core of the first embodiment of the utility model;

[0036] Figure 2 It is a structural schematic diagram of a first stator punching segment according to an embodiment of the utility model;

[0037] Figure 3 for Figure 2 A partial schematic diagram of a first stator punch segment of an embodiment;

[0038] Figure 4 and Figure 5 It is a structural schematic diagram of the stator core of the second embodiment of the utility model;

[0039] Figure 6 It is a structural schematic diagram of a second stator punch segment of an embodiment of the utility model;

[0040] Figure 7 for Figure 6 A cross-sectional view of the second stator punch segment EE of the embodiment;

[0041] Figure 8 It is a schematic structural diagram of the oil passage of the motor of the third embodiment of the utility model;

[0042] Fig. 9 It is a schematic structural diagram of the oil passage of the motor of the fourth embodiment of the utility model;

[0043] Fig.10 A schematic diagram of the structure of the oil passage of the motor of the fifth embodiment of the utility model; and

[0044] Fig.11 It is a structural schematic diagram of the oil passage of the motor according to the sixth embodiment of the utility model. DETAILED DESCRIPTION

[0045] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed by the present invention. The present invention can also be implemented or applied through other different specific implementations, and the details in the present invention can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0046] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0047] In the description of the present invention, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present invention and the features of different embodiments or examples, unless they are contradictory.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the representation of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In order to clearly describe the present invention, components irrelevant to the description are omitted, and the same or similar components throughout the specification are given the same reference symbols.

[0050] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0051] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0052] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0053] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present invention. The singular form used herein also includes the plural form as long as the sentence does not clearly indicate the opposite meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0054] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the content of relevant technical literature and current prompts, and as long as they are not defined, they shall not be overly interpreted as ideal or very formal meanings.

[0055] In order to overcome the above-mentioned technical problems, the utility model provides a stator core and a motor comprising the same, wherein the stator core comprises a stacked first stator punch segment, the first stator punch segment having a first center hole and a first annular wall, the outer periphery of the first annular wall being provided with an arcuate groove along the circumferential direction; the projection of the arcuate groove of the first stator punch segment on a plane perpendicular to the axis of the stator core at least partially overlaps with the projection of the arcuate groove of the first stator punch segment of an adjacent layer on a plane perpendicular to the axis of the stator core; the multiple arcuate grooves of the multiple first stator punch segments are connected to form a spiral oil channel extending along the axial direction of the stator core.

[0056] The stator core of the utility model forms arc grooves by cutting off part of the annular wall of the stator punch segment, and at the same time, when each stator punch segment is stacked, its grooves are arranged in a spiral along the axis of the stator core. When the stator core is set in the housing of the motor, a plurality of arc grooves form connected spiral oil passages. Furthermore, the holes arranged on the annular wall of the stator punch segment form axial oil holes connected to the spiral oil passages. The spiral oil passages and axial oil holes of the stator core of the utility model increase the area and oil flow of the motor cooling oil circuit. At the same time, the cooling effect is uniform and the cooling efficiency of the cooling oil passage is higher.

[0057] The structure of the stator core of the present invention and the motor including the same will be further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0058] Figure 1 It is an exploded view of the stator core of the first embodiment of the utility model; specifically, the stator core includes a stacked first stator punching segments 1, where a is a natural number greater than 1; it should be noted that the stator punching segment in this article is formed by stacking multiple stator punching sheets with the same structure.

[0059] Figure 2 Schematic diagram of the structure of a first stator punching segment of an embodiment of the utility model, the first stator punching segment 1 has a first central hole H1 and a first annular wall 11, the inner periphery of the first annular wall 11 is provided with a first stator slot 112, and the outer periphery of the first annular wall 11 is provided with an arc-shaped groove C along the circumferential direction; Figure 3 for Figure 2 A partial schematic diagram of the first stator punch segment at the dotted line frame, the arc-shaped groove C can be formed by cutting off an arc-shaped portion of the outer circumference of the first annular wall 11. Figure 2 In the embodiment of the embodiment, the arc width W of the arc groove C is consistent in the circumferential direction, that is, the outer arc radius of the arc groove C is R1, the inner arc radius is R2, the radius R1> the radius R2, and the outer arc and the inner arc are co-centered, and the central angles of the outer arc and the inner arc are the same. In some other embodiments, the arc width of the arc groove C may be inconsistent in the circumferential direction. The arc width of the arc groove C can be determined according to the required depth of the oil channel formed after it is assembled with the inner wall of the motor housing.

[0060] When multiple first stator punching segments 1 of the stator core of the utility model are stacked, two first stator punching segments of adjacent layers are relatively rotated. Figure 1The exploded view of the multiple first stator punch segments, that is, the arc grooves C of the two first stator punch segments of the adjacent layers are not completely overlapped, but the projection of the arc groove C of the first stator punch segment 1 on the plane perpendicular to the axis XX of the stator core and the projection of the arc groove of the first stator punch segment of the adjacent layer on the plane perpendicular to the axis of the stator core at least partially overlap; the above arrangement ensures that the two arc grooves C of the two first stator punch segments of the adjacent layers can be connected or the two arc grooves C are connected, so that when the two arc grooves C are assembled with the inner wall of the motor housing to form an oil channel, the oil channel sections corresponding to the two arc grooves C are connected, and accordingly, the multiple arc grooves C of the multiple first stator punch segments 1 are connected and form an axial direction ( Figure 1 More specifically, the arc-shaped grooves C of adjacent layers are connected in the circumferential direction of the stator core, and the arc-shaped grooves C of each layer form a spiral oil channel extending along the axial direction of the stator core.

[0061] It should be noted that when two adjacent layers of first stator punch segments are stacked in a relatively rotating manner, the stator slots of the two layers of first stator punch segments need to overlap. Further, if the inner circumference of the first annular wall 11 is provided with Z first stator slots 112, Z is a natural number greater than 1; the angle of the arc groove C of the first stator punch segment, that is, the arc angle of the arc groove is θ, see Figure 2 , when stacked, the rotation angle of any of the first stator punch segments relative to the first stator punch segment adjacent thereto is β (not shown in the figure), then:

[0062] When a=2, that is, the stator core includes two first stator punch segments, it needs to satisfy:

[0063] 0°<θ<180, 0°<β<θ, β=n*360° / Z, n is a natural number ≥1; 0°<β<θ enables the arc grooves C of the two stacked first punch segments to have overlapping parts, so that the upper and lower arc grooves C form a connected oil channel; at the same time, β=n*360° / Z, so that the stator slots of the upper and lower stacked first punch segments are aligned, and finally a stator core that can be used in a motor is formed.

[0064] When a>2, that is, the stator core includes more than two first stator punch segments, it is necessary to satisfy:

[0065] 360° / a<θ<180°, and 0°<β<θ, β=n*360° / Z, n is a natural number ≥1. It should be noted that when there are more than two first stator punch segments, the above condition is that the rotation angle β of the first stator punch segment of each adjacent layer relative to the first stator punch segment of the previous layer is equal. In actual applications, the rotation angles of the first stator punch segments of adjacent layers of a stator core relative to the first stator punch segment of the previous layer may be different, but when two adjacent first stator punch segments are stacked, their two arc-shaped grooves C partially overlap and the stator slots of two adjacent first stator punch segments completely overlap.

[0066] The spiral oil passage extending along the axial direction of the stator core formed by connecting multiple arc-shaped grooves C in the first embodiment can play a role in cooling the motor. In order to further improve the cooling effect of the oil passage, in some embodiments, the outer periphery of the first annular wall 11 except the arc-shaped grooves C is provided with multiple first holes 111 penetrating the first annular wall 11. The first holes 111 can be circular, elliptical or polygonal in shape. Since the oil passage formed by connecting multiple arc-shaped grooves C extends along the axial direction of the stator core, preferably, the axis of the first hole 111 is parallel to the axis of the stator core. At the same time, the multiple first holes 111 of the first stator punch segment are connected with the multiple first holes 111 of the first stator punch segment of the adjacent layer. At this time, a spiral oil passage extending along the axial direction ( Figure 1 An oil hole straight channel parallel to the XX direction) and spanning multiple first stator punch segments.

[0067] Furthermore, the projection of at least a plurality of first holes of the first stator punch segment on a plane perpendicular to the axis of the stator core falls within the projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core. That is, when two first stator punch segments are rotated at a certain angle and stacked, the first holes 111 of at least a portion of the first annular wall 11 of a first stator punch segment 1 are connected to the arc-shaped groove C of another first stator punch segment 1. Structurally, the vertical distance between the first hole 111 and the axis of the stator core must be greater than the vertical distance between the outer periphery of the first annular wall of the first stator punch segment 1 where the arc-shaped groove C is set and the axis of the stator core, or in other words, the radius of the first annular wall where the first hole is set is greater than the radius of the first annular wall where the arc-shaped groove C is set. The above structure ensures that the coolant in the groove can flow to the axial straight channel through the spiral oil channel.

[0068] The shape and number of the first holes 111 can be set according to the specific structure of the stator core and are not limited here. Preferably, the circumferential spacing between adjacent first holes 111 is equal, that is, multiple first holes 111 are evenly distributed circumferentially on the outer periphery of the first annular wall 11 where no arc groove C is provided. The evenly distributed first holes 111 can improve the uniformity of motor cooling and reduce the possibility of local heating of the motor.

[0069] The coolant in the groove of the stator core of the utility model partially flows along the spiral oil channel, and partially flows along the axial straight channel, providing a cooling oil channel with higher cooling efficiency. At the same time, the stator iron can be formed by rotating and stacking multiple first stator punch segments of the same structure, reducing the types of punch segments, facilitating manufacturing, and greatly reducing the manufacturing cost of the stator core.

[0070] Figure 4 and Figure 5 The schematic diagrams of the structure of the stator core of the second embodiment of the utility model from different perspectives are respectively different from the first embodiment. The stator core further includes a second stator punching segment 2 at both ends; the second stator punching segment 2 has a second center hole H2 and a second annular wall 21; the inner circumference of the second annular wall 21 is also provided with a second stator slot 212, and the second center hole H2 is adapted to the structure of the first center hole H1, and the number / structure of the second stator slot 212 is adapted to the number / structure of the first stator slot 112. The second annular wall 21 corresponding to the arc-shaped groove of the adjacent first stator punching segment is provided with a second hole 211, that is, the projection of the second annular wall 21 provided with the second hole 211 on the plane perpendicular to the axis XX of the stator core coincides with the projection of the arc-shaped groove of the adjacent layer of the first stator punching segment on the plane perpendicular to the axis of the stator core. The above arrangement can make the second hole 211 communicate with the arc-shaped groove C of the adjacent layer of the first stator punching segment 1. The second hole 211 runs through the second annular wall 21. The second hole 211 may be circular, elliptical or polygonal in shape. The shape and number of the second hole 211 may be set according to the specific structure of the stator core, and a plurality of second holes 211 may be distributed at equal intervals around the outer periphery of the second annular wall 21 of the portion.

[0071] Figure 7 for Figure 6 The cross-sectional view of the second stator punching segment EE of the embodiment, the axis pp of the second hole 211 intersects with the axis of the stator core, Figure 7 X'X' is the axis XX of the stator core. The second hole 211 is used to spray oil toward the end of the winding. The second hole 211 can be post-processed and can be obtained by a drilling machine or laser cutting.

[0072] The utility model also provides a motor, which includes the stator core and a cylindrical shell, wherein the stator core is arranged in the shell; the shell is provided with an oil inlet 3 passing through, one end of the oil inlet 3 is connected to the oil channel, and the other end is used to connect to an external oil supply pipe. Figure 8 This is a schematic diagram of the structure of the oil passage of the motor of the third embodiment of the utility model. It can be seen that the five first stator punch segments constitute a cycle, and the arc grooves of the five first stator punch segments are arc groove C1, arc groove C2, arc groove C3, arc groove C4 and arc groove C5 respectively. The first stator punch segment of the lower layer is rotated 90° relative to the first stator punch segment of the upper layer. The oil inlet 3 is arranged in the middle of the stator core and is connected to the oil passage formed by the arc groove. At the same time, the first stator punch segment of the third embodiment is provided with a first hole 111, and the first hole 111 is arranged along the axial direction of the stator core. When the motor is running, the cooling oil enters the oil passage formed by the groove of the stator core and the shell through the oil inlet 3 from the external oil supply pipe, and flows to the two ends of the stator core along the oil passage formed by the groove and the shell and the oil passage formed by the first hole, thereby playing a role in cooling the motor.

[0073] Fig. 9 This is a schematic diagram of the structure of the oil passage of the motor of the fourth embodiment of the utility model. It can be seen that, therein, four first stator punch segments also constitute a cycle, and the arc grooves of the four first stator punch segments are arc groove C1, arc groove C2, arc groove C3 and arc groove C4 respectively. The oil inlet 3 is arranged in the middle of the stator core. Different from the third embodiment, the first stator punch segment of the lower layer on one side of the oil inlet 3 is rotated 90° relative to the first stator punch segment of the upper layer. The first stator punch segment of the lower layer on the other side of the oil inlet 3 is rotated -90° relative to the first stator punch segment of the upper layer, that is, the relative rotation directions of the first stator punch segments on both sides of the oil inlet 3 are different.

[0074] Fig.10 This is a structural schematic diagram of the oil passage of the motor of the fifth embodiment of the utility model. Different from the third embodiment, the stator core of the fifth embodiment includes a plurality of first stator punch segments and a plurality of second stator punch segments at both ends of the first stator punch segments. Accordingly, the two ends of the stator core are provided with oil passages toward the windings formed by second holes 211.

[0075] Fig.11 This is a schematic diagram of the structure of the oil passage of the motor of the sixth embodiment of the utility model. The structure of the stator core is the same as that of the fifth embodiment. The difference is that one end of the oil inlet 3a provided in the shell is connected to the oil passage at one end of the stator core.

[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0077] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A stator core, characterized in that: The invention comprises a stacked first stator punch segments, where a is a natural number greater than 1; The first stator punch segment has a first central hole and a first annular wall, and the outer periphery of the first annular wall is provided with an arc-shaped groove along the circumferential direction; The projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core at least partially overlaps with the projection of the arc-shaped groove of the first stator punch segment of an adjacent layer on a plane perpendicular to the axis of the stator core; The plurality of arc-shaped grooves of the plurality of first stator punch segments are connected to form a spiral oil passage extending along the axial direction of the stator core.

2. The stator core according to claim 1, characterized in that: A plurality of first holes penetrating through the first annular wall are arranged on the outer periphery of the first annular wall except the arc-shaped groove.

3. The stator core according to claim 2, characterized in that: The axis of the first hole is parallel to the axis of the stator core.

4. The stator core according to claim 2, characterized in that: The first hole is circular, elliptical or polygonal.

5. The stator core according to claim 2, characterized in that: The circumferential spacing between adjacent first holes is equal.

6. The stator core according to claim 2, characterized in that: The plurality of first holes of the first stator punching segment are in communication with the plurality of first holes of the first stator punching segment of an adjacent layer.

7. The stator core according to claim 2, characterized in that: The projection of at least a plurality of first holes of the first stator punch segment on a plane perpendicular to the axis of the stator core falls within the projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core.

8. The stator core according to claim 1, characterized in that: The inner circumference of the first annular wall is provided with Z stator slots, where Z is a natural number greater than 1; The angle of the arc groove of the first stator punch segment is θ, and the rotation angle of any first stator punch segment relative to the first stator punch segment adjacent thereto during stacking is β, then: When a=2, it satisfies: 0°<θ<180, 0°<β<θ, β=n*360° / Z, n is a natural number ≥1; When a>2, it satisfies: 360° / a<θ<180°, and 0°<β<θ, β=n*360° / Z, where n is a natural number ≥1.

9. The stator core according to claim 1, characterized in that: The stator core also includes second stator punching segments at both ends; The second stator punch segment has a second central hole and a second annular wall; A second hole is arranged on the second annular wall corresponding to the arc-shaped groove of the adjacent first stator punch segment, and the second hole penetrates the second annular wall.

10. The stator core according to claim 9, characterized in that: The axis of the second hole intersects with the axis of the stator core.

11. A motor, characterized in that: The stator core comprises the stator core as claimed in any one of claims 1 to 10.

12. The motor according to claim 11, characterized in that The motor comprises a cylindrical housing; The stator core is arranged in the housing; The shell is provided with an oil inlet which passes through the shell. One end of the oil inlet is connected to the oil channel, and the other end is used to be connected to an external oil supply pipe.

13. The motor according to claim 12, characterized in that One end of the oil inlet is connected to the oil passage in the middle part, or one end of the oil inlet is connected to the oil passage at one end of the stator core.

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