Stator core and motor

Abstract

The utility model discloses a stator iron core, which comprises a first iron core punching sheet group. The plurality of second iron core punching sheet groups are arranged at one end of the first iron core punching sheet group along the axial direction, each second iron core punching sheet group comprises a plurality of first convex parts and first concave parts which are arranged at intervals along the circumferential direction, and the adjacent first concave parts are staggered in the axial direction and are communicated to form a first oil path; the plurality of third iron core punching sheet groups are arranged at the other end of the first iron core punching sheet group along the axial direction, each third iron core punching sheet group comprises a plurality of second convex parts and second concave parts which are arranged at intervals along the circumferential direction, and the adjacent second concave parts are staggered in the axial direction and are communicated to form a second oil path; an oil inlet channel is defined by the first iron core punching sheet set, the second iron core punching sheet set and the third iron core punching sheet set, and the oil inlet channel is communicated with the first oil way and the second oil way. According to the utility model, a plurality of non-axial oil channels can be formed, so that the cooling effect is improved while the material cost is reduced. The utility model also provides a motor.

Description

Technical Field

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

[0002] Currently, the stator core in motors is cooled by adding an additional oil channel structure to the radial outer surface of the stator core. Within this oil channel, cooling oil cools the stator core through axial direct flow or staggered turbulent flow. This cooling method, requiring an additional oil channel structure, results in high material costs, complex processes, and poor cooling effectiveness. Utility Model Content

[0003] The present invention aims to address the technical issues of high material costs, complex processes, and poor cooling performance in current stator core cooling methods. The present invention provides a stator core that can form multiple non-axial oil passages by providing a first recess on a second core punching sheet and a second recess on a third core punching sheet, thereby reducing material costs while improving cooling performance.

[0004] To solve the above technical problems, the embodiment of the present utility model discloses a stator core, comprising:

[0005] A first core punching sheet group includes a plurality of first core punching sheets stacked in an axial direction;

[0006] a plurality of second core punching sheet groups, each of which is provided at one end of the first core punching sheet group along the axial direction, wherein each second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction, each second core punching sheet includes a plurality of first protrusions and first recesses spaced apart circumferentially, and the first recesses of two adjacent second core punching sheet groups are staggered in the axial direction and connected to each other, forming a plurality of first oil passages spaced apart along the circumferential direction;

[0007] A plurality of third core punching sheet groups are provided along the axial direction at the other end of the first core punching sheet group, each of the third core punching sheet groups includes a plurality of third core punching sheets stacked along the axial direction, each of the third core punching sheets includes a plurality of second protrusions and second recesses spaced apart around the circumferential direction, and the second recesses of two adjacent third core punching sheet groups are staggered and connected in the axial direction to form a plurality of second oil passages spaced apart along the circumferential direction; wherein,

[0008] The first core punching sheet group, the second core punching sheet group, and the third core punching sheet group define an oil inlet channel. The oil inlet channel extends along the circumferential direction and is connected to the multiple first oil passages and the multiple second oil passages.

[0009] By adopting the above technical solution, in the plurality of second core punching sheet groups, the first recesses of two adjacent second core punching sheet groups are axially staggered and connected, that is, the two adjacent first recesses are not completely aligned in the axial direction, and there is partial overlap in the axial direction, thereby forming a plurality of non-axial first oil passages spaced apart along the circumferential direction. In the plurality of third core punching sheet groups, the second recesses of two adjacent third core punching sheet groups are axially staggered and connected, that is, the two adjacent second recesses are not completely aligned in the axial direction, and there is partial overlap in the axial direction, thereby forming a plurality of non-axial second oil passages spaced apart along the circumferential direction. The oil inlet channel is connected with the plurality of first oil passages and the plurality of second oil passages to form a plurality of non-axial oil passages.

[0010] Compared with the cooling methods of axial direct current or staggered turbulence, the multiple non-axial oil channels in this technical solution can change the flow direction of the cooling oil, increase the path and time of the cooling oil flowing on the surface of the stator core, so that the cooling oil can continuously contact the stator core, enhance heat conduction, and form a continuous cooling effect on the surface of the stator core, thereby improving the heat transfer efficiency and the cooling effect.

[0011] Furthermore, by directly providing the first recess in the second core sheet and the second recess in the third core sheet, the multiple non-axial oil passages formed by this arrangement can satisfy the cooling requirements of the stator core with cooling oil. Therefore, it is no longer necessary to add an additional oil passage structure on the radial outer surface of the stator core to cool the stator core. This can reduce the number of components and material costs while also improving the cooling effect.

[0012] According to another specific embodiment of the present invention, the outer diameter of the first core punching sheet is smaller than the outer diameter of the second core punching sheet, and the outer diameter of the first core punching sheet is smaller than the outer diameter of the third core punching sheet.

[0013] The above technical solution ensures that the outer diameter difference between the first iron core punching sheet and the second iron core punching sheet, and the outer diameter difference between the third iron core punching sheet can form an oil inlet channel.

[0014] According to another specific embodiment of the present invention, the plurality of first oil passages extend respectively along a first direction, the plurality of second oil passages extend respectively along the first direction, and the first direction is inclined with respect to the axial direction.

[0015] By adopting the above technical solution, the first direction and the axial direction are tilted to form a non-axial first oil path and a second oil path, thereby changing the oil flow direction of the cooling oil, increasing the path and time of the cooling oil flowing on the surface of the stator core, so that the cooling oil can continuously contact the stator core, enhance heat conduction, and form a continuous cooling effect on the surface of the stator core, thereby improving the heat transfer efficiency and the cooling effect.

[0016] According to another specific embodiment of the present invention, the first recess of each second core punching group partially overlaps with the adjacent first protrusion and the adjacent first recess in the axial direction;

[0017] The second recessed portion of each of the third core sheet groups partially overlaps with the adjacent second protrusions and adjacent second recessed portions in the axial direction.

[0018] Adopting the above-mentioned technical solution, taking the second core punching sheet group as an example, if the first recess does not overlap with the adjacent first protrusion in the axial direction, then the first recess at this time completely overlaps with the adjacent first recess in the axial direction, and the cooling oil at this time flows in a direct current in the axial direction, and a non-axial first oil path will not be formed, and the cooling effect will be reduced. If the first recess does not overlap with the adjacent first recess in the axial direction, then the first oil path will not be formed, the cooling oil cannot flow, and the stator core cannot be cooled. In the present technical solution, the first recess partially overlaps with the adjacent first protrusion and the adjacent first recess in the axial direction, so that a plurality of non-axial first oil paths spaced apart along the circumferential direction can be formed, which changes the oil flow direction of the cooling oil, increases the path and time of the cooling oil flowing on the surface of the stator core, and improves the cooling effect.

[0019] Similarly, for the third core punching sheet group, if the second recess does not overlap with the adjacent second protrusion in the axial direction, then the second recess at this time completely overlaps with the adjacent second recess in the axial direction, and the cooling oil at this time flows in a direct current in the axial direction, and a non-axial second oil path will not be formed, and the cooling effect will be reduced. If the second recess does not overlap with the adjacent second recess in the axial direction, then a second oil path will not be formed, the cooling oil cannot flow, and the stator core cannot be cooled. In the present technical solution, the second recess overlaps with the adjacent second protrusion and the adjacent second recess in the axial direction, so that a plurality of non-axial second oil paths spaced apart along the circumferential direction can be formed, which changes the oil flow direction of the cooling oil, increases the path and time of the cooling oil flowing on the surface of the stator core, and improves the cooling effect.

[0020] According to another specific embodiment of the present invention, the stator core includes a first oil spray ring and a second oil spray ring. Along the axial direction, the first oil spray ring is connected and communicated with the first recess at the outermost end, and the second oil spray ring is connected and communicated with the second recess at the outermost end. The first oil spray ring and the second oil spray ring are used to spray external cooling oil onto the external winding.

[0021] By adopting the above technical solution, cooling oil is sprayed onto the external winding through the first oil spray ring and the second oil spray ring, thereby cooling the winding.

[0022] According to another specific embodiment of the present invention, each of the second core punching sheets includes 16 of the first protrusions and 16 of the first recesses, and each of the third core punching sheets includes 16 of the second protrusions and 16 of the second recesses.

[0023] According to another specific embodiment of the present invention, each of the first core punching sheets includes 48 slots and 48 teeth, each of the second core punching sheets includes 48 slots and 48 teeth, and each of the third core punching sheets includes 48 slots and 48 teeth.

[0024] The embodiment of the present utility model further discloses a motor, comprising:

[0025] The stator core according to any one of the preceding items;

[0026] a winding connected to the slot portion of the stator core;

[0027] The stator core is arranged in the housing, and the housing is connected to the stator core.

[0028] According to another specific embodiment of the present invention, the housing includes an oil inlet, and the oil inlet is communicated with the oil inlet channel of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a motor according to an embodiment of the present invention is shown.

[0030] Figure 2 A schematic diagram showing the connection between the stator core and the winding in an embodiment of the present utility model is shown.

[0031] Figure 3 A three-dimensional view of a stator core according to an embodiment of the present invention is shown.

[0032] Figure 4 A top view of the stator core according to an embodiment of the present invention is shown.

[0033] Figure 5 An exploded view of the stator core according to an embodiment of the present invention is shown.

[0034] Figure 6 A schematic diagram showing the first core punching sheet of an embodiment of the present utility model is shown.

[0035] Figure 7 A schematic diagram showing the second core punching sheet and the third core punching sheet of an embodiment of the present utility model is shown.

[0036] Description of Reference Numerals

[0037] stator core 10;

[0038] Groove portion 11; tooth portion 12;

[0039] Oil channel 13; oil inlet channel 131; first oil channel 132; second oil channel 133;

[0040] First core punching sheet group 14; first core punching sheet 141;

[0041] Second core punching sheet group 15; second core punching sheet 151; first convex portion 1511; first concave portion 1512;

[0042] The third core punching sheet group 16; the third core punching sheet 161; the second convex portion 1611; the second concave portion 1612;

[0043] First oil injection ring 17;

[0044] Second fuel injection ring 18;

[0045] Winding 20;

[0046] Housing 30; oil inlet 31. DETAILED DESCRIPTION

[0047] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0048] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0049] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0050] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0051] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0053] refer to Figures 1 to 3 The present application provides a motor (not shown) including a stator core 10, a winding 20, and a housing 30. The stator core 10 includes forty-eight slots 11 and forty-eight teeth 12. The winding 20 is disposed in the slots 11 of the stator core 10 and abuts against the teeth 12.

[0054] The stator core 10 is disposed within a housing 30, which is connected to the stator core 10. The stator core 10 includes an oil inlet passage 131 extending along the circumferential direction R, sixteen non-axial first oil passages 132 spaced apart along the circumferential direction R, and sixteen non-axial second oil passages 133 spaced apart along the circumferential direction R. The oil inlet passage 131 communicates with the sixteen first oil passages 132 and the sixteen second oil passages 133. The housing 30 includes an oil inlet port 31, which communicates with the oil inlet passage 131 of the stator core 10.

[0055] Using the above technical solution, refer to Figure 1 and Figure 2 , the direction of cooling oil entering the stator core 10 from the housing 30 (such as Figure 1 (As shown by the dashed arrows in the middle) the cooling oil flows from the oil inlet 31 of the housing 30 into the oil inlet channel 131 of the stator core 10, and then the cooling oil flows to the left through the oil inlet channel 131 to the sixteen first oil paths 132 (i.e., the direction of the cooling oil is: a→b) and to the right to the sixteen second oil paths 133 (i.e., the direction of the cooling oil is: a→c), thereby cooling the stator core 10.

[0056] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of slots 11 and teeth 12 of the stator core 10. For example, in other possible embodiments, the number of slots 11 and teeth 12 of the stator core 10 can be twenty-four, fifty-four, seventy-two, etc., respectively. The embodiment of the present application does not impose any specific limitation on the number of first oil passages 132. For example, in other possible embodiments, the number of first oil passages 132 can be seventeen, eighteen, nineteen, etc. The embodiment of the present application does not impose any specific limitation on the number of second oil passages 133. For example, in other possible embodiments, the number of second oil passages 133 can be seventeen, eighteen, nineteen, etc., respectively.

[0057] In some possible implementations, reference Figure 1 and Figure 2 The stator core 10 includes two first oil spray rings 17 and two second oil spray rings 18. Along the axial direction X, the two first oil spray rings 17 are connected and communicated with the first recess 1512 at the outermost end, and the two second oil spray rings 18 are connected and communicated with the second recess 1612 at the outermost end. The first oil spray rings 17 and the second oil spray rings 18 are used to spray cooling oil onto the external winding 20.

[0058] By adopting the above technical solution, cooling oil is sprayed onto the external winding 20 through the first oil spray ring 17 and the second oil spray ring 18, thereby cooling the winding 20.

[0059] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of first oil injection rings 17. For example, in other possible embodiments, the number of first oil injection rings 17 may be three, four, etc. The embodiment of the present application does not impose any specific limitation on the number of second oil injection rings 18. For example, in other possible embodiments, the number of second oil injection rings 18 may be three, four, etc.

[0060] Next, the stator core 10 will be explained in detail.

[0061] refer to Figures 3 to 5 The stator core 10 includes a first core punching group 14, five second core punching groups 15 and five third core punching groups 16. Along the axial direction X, the five second core punching groups 15 and the five third core punching groups 16 are respectively arranged at both ends of the first core punching group 14. The stator core 10 also includes sixteen non-axial oil passages 13 (such as Figure 2 As shown), the oil channel 13 includes an oil inlet channel 131, a first oil channel 132 and a second oil channel 133. The first core punching sheet group 14 and the second core punching sheet group 15 and the third core punching sheet group 16 define the oil inlet channel 131.

[0062] refer to Figure 3 and Figure 6 The first core punching sheet group 14 includes a plurality of first core punching sheets 141 stacked along the axial direction X.

[0063] refer to Figure 2 、 Figure 3 and Figure 7 Each second core punching sheet group 15 includes a plurality of second core punching sheets 151 stacked along the axial direction X, and each second core punching sheet 151 includes sixteen first protrusions 1511 and sixteen first recesses 1512 spaced apart around the circumferential direction R. The first recesses 1512 of two adjacent second core punching sheet groups 15 are staggered and connected in the axial direction X, forming sixteen non-axial first oil passages 132 spaced apart along the circumferential direction R.

[0064] refer to Figure 2 、 Figure 3 and Figure 7 Each third core punching sheet group 16 includes a plurality of third core punching sheets 161 stacked along the axial direction X, and each third core punching sheet 161 includes sixteen second protrusions 1611 and sixteen second recesses 1612 spaced apart around the circumferential direction R. The second recesses 1612 of two adjacent third core punching sheet groups 16 are staggered and connected in the axial direction X, forming sixteen non-axial second oil passages 133 spaced apart along the circumferential direction R.

[0065] By adopting the above technical solution, among the five second core punching sheet groups 15, the first recesses 1512 of two adjacent second core punching sheet groups 15 are staggered and connected in the axial direction X, that is, the two adjacent first recesses 1512 are not completely aligned in the axial direction X, and there is partial overlap in the axial direction X, so sixteen non-axial first oil passages 132 arranged at intervals along the circumferential direction R can be formed.

[0066] In the five third core punching sheet groups 16, the second recesses 1612 of two adjacent third core punching sheet groups 16 are staggered and connected in the axial direction X, that is, the two adjacent second recesses 1612 are not completely aligned in the axial direction X, and there is partial overlap in the axial direction X, so sixteen non-axial second oil passages 133 arranged at intervals along the circumferential direction R can be formed, and the oil inlet channel 131 is connected with the sixteen first oil passages 132 and the sixteen second oil passages 133 to form sixteen non-axial oil passages 13.

[0067] refer to Figure 2 , the direction of the cooling oil in the first oil passage 132 (such as Figure 2As shown by the dashed arrow in the middle, the cooling oil enters the first recess 1512 closest to the stator core 10 in the axial direction X from the oil inlet channel 131 (i.e., the direction of the cooling oil is: a→b), then flows in the first recess 1512 along the circumferential direction R, and enters another first recess 1512 closest to the stator core 10 in the axial direction X again (i.e., the direction of the cooling oil is: b→d→e), and flows in the first oil path 132 in sequence until it flows to the first recess 1512 at the outermost end of the stator core 10 in the axial direction X (i.e., the complete direction of the cooling oil is: a→b→d→e→f→g→h→i→j→k), thereby completing the cooling of the stator core 10.

[0068] refer to Figure 2 , the direction of the cooling oil in the second oil passage 133 (such as Figure 2 The cooling oil flows from the oil inlet channel 131 into the second recess 1612 closest to the stator core 10 in the axial direction X (i.e., the direction of the cooling oil is: a→c), then flows in the second recess 1612 along the circumferential direction R, and again enters another second recess 1612 closest to the stator core 10 in the axial direction X (i.e., the direction of the cooling oil is: c→l→m), and flows in the second oil path 133 in sequence until it reaches the second recess 1612 at the outermost end of the stator core 10 in the axial direction X (i.e., the complete direction of the cooling oil is: a→c→l→m→n→o→p→q→r→s), thereby completing the cooling of the stator core 10.

[0069] Compared with the cooling method of axial direct current or staggered turbulence, the sixteen non-axial oil channels 13 in the present technical solution can change the oil flow direction of the cooling oil, increase the path and time of the cooling oil flowing on the surface of the stator core 10, so that the cold oil can continuously contact the stator core 10, enhance heat conduction, and form a continuous cooling effect on the surface of the stator core 10, thereby improving the heat transfer efficiency and the cooling effect.

[0070] Furthermore, by directly providing the first recess 1512 on the second core punching sheet 151 and the second recess 1612 on the third core punching sheet 161, the sixteen non-axial oil passages 13 formed by this arrangement can satisfy the cooling oil requirements for cooling the stator core 10. Therefore, it is no longer necessary to add an additional layer of oil passage structure on the radial outer surface of the stator core 10 to cool the stator core 10, thereby reducing the number of components and material costs while also improving the cooling effect.

[0071] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of first protrusions 1511 and first recesses 1512 included in each second core punching sheet 151. For example, in other possible implementations, the number of first protrusions 1511 and first recesses 1512 may be seventeen, eighteen, nineteen, etc. The embodiment of the present application does not impose any specific limitation on the number of second protrusions 1611 and second recesses 1612 included in each third core punching sheet 161. For example, in other possible implementations, the number of second protrusions 1611 and second recesses 1612 may be seventeen, eighteen, nineteen, etc.

[0072] In some possible implementations, reference Figure 3 The sixteen first oil passages 132 extend along the first direction Y, and the plurality of second oil passages 133 extend along the first direction Y. The first direction Y is tilted to the axial direction X, and the angle between the first direction Y and the axial direction X is α.

[0073] By adopting the above technical solution, the first direction Y and the axial direction X are tilted to form a non-axial first oil path 132 and a second oil path 133, thereby changing the oil flow direction of the cooling oil, increasing the path and time of the cooling oil flowing on the surface of the stator core 10, so that the cooling oil can continuously contact the stator core 10, enhance heat conduction, and form a continuous cooling effect on the surface of the stator core 10, thereby improving the heat transfer efficiency and the cooling effect.

[0074] It should be noted that the embodiment of the present application does not impose any specific restrictions on the size of the angle α between the first direction Y and the axial direction X. For example, in other possible implementations, the size of the angle α between the first direction Y and the axial direction X can be 50°, 53°, 55°, 60°, etc.

[0075] In some possible implementations, reference Figure 3 and Figure 4 The first recess 1512 of each second core punching sheet group 15 partially overlaps with the adjacent first protrusion 1511 and the adjacent first recess 1512 in the axial direction X; the second recess 1612 of each third core punching sheet group 16 partially overlaps with the adjacent second protrusion 1611 and the adjacent second recess 1612 in the axial direction X.

[0076] Using the above technical solution, taking the second core punching sheet group 15 as an example, if the first recess 1512 does not overlap with the adjacent first protrusion 1511 in the axial direction X, then the first recess 1512 completely overlaps with the adjacent first recess 1512 in the axial direction X. At this time, the cooling oil flows in a straight line in the axial direction X, and no non-axial first oil path 132 is formed, which reduces the cooling effect. If the first recess 1512 does not overlap with the adjacent first recess 1512 in the axial direction X, then the first oil path 132 is not formed, the cooling oil cannot flow, and the stator core 10 cannot be cooled. In this technical solution, the first recess 1512 overlaps with the adjacent first protrusion 1511 and the adjacent first recess 1512 in the axial direction X. Therefore, multiple non-axial first oil paths 132 spaced apart along the circumferential direction R can be formed, changing the direction of the cooling oil flow, increasing the path and time for the cooling oil to flow on the surface of the stator core 10, and improving the cooling effect.

[0077] Similarly, for the third core punching group 16, if the second recess 1612 does not overlap with the adjacent second protrusion 1611 in the axial direction X, then the second recess 1612 at this time completely overlaps with the adjacent second recess 1612 in the axial direction X, and the cooling oil at this time flows in a straight line in the axial direction X, and no non-axial second oil path 133 is formed, and the cooling effect is reduced. If the second recess 1612 does not overlap with the adjacent second recess 1612 in the axial direction X, then the second oil path 133 is not formed, the cooling oil cannot flow, and the stator core 10 cannot be cooled. In the present technical solution, the second recess 1612 overlaps with the adjacent second protrusion 1611 and the adjacent second recess 1612 in the axial direction X, so that multiple non-axial second oil paths 133 spaced apart along the circumferential direction R can be formed, changing the oil flow direction of the cooling oil, increasing the path and time for the cooling oil to flow on the surface of the stator core 10, and improving the cooling effect.

[0078] In some possible implementations, reference Figure 4 、 Figure 6 and Figure 7 The outer diameter d1 of the first core punching sheet 141 is smaller than the outer diameter d2 of the second core punching sheet 151 , and the outer diameter d1 of the first core punching sheet 141 is smaller than the outer diameter d3 of the third core punching sheet 161 .

[0079] The above technical solution ensures that the outer diameter difference between the first core punching sheet 141 and the second core punching sheet 151 and the outer diameter difference between the third core punching sheet 161 can form the oil inlet channel 131 .

[0080] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A stator core, characterized in that: The stator core comprises: A first core punching sheet group includes a plurality of first core punching sheets stacked in an axial direction; a plurality of second core punching sheet groups, each of which is provided at one end of the first core punching sheet group along the axial direction, wherein each second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction, each second core punching sheet includes a plurality of first protrusions and first recesses spaced apart circumferentially, and the first recesses of two adjacent second core punching sheet groups are staggered in the axial direction and connected to each other, forming a plurality of first oil passages spaced apart along the circumferential direction; A plurality of third core punching sheet groups are provided along the axial direction at the other end of the first core punching sheet group, each of the third core punching sheet groups includes a plurality of third core punching sheets stacked along the axial direction, each of the third core punching sheets includes a plurality of second protrusions and second recesses spaced apart around the circumferential direction, and the second recesses of two adjacent third core punching sheet groups are staggered and connected in the axial direction to form a plurality of second oil passages spaced apart along the circumferential direction; wherein, The first core punching sheet group, the second core punching sheet group, and the third core punching sheet group define an oil inlet channel. The oil inlet channel extends along the circumferential direction and is connected to the multiple first oil passages and the multiple second oil passages.

2. The stator core according to claim 1, wherein: The outer diameter of the first core punching sheet is smaller than the outer diameter of the second core punching sheet, and the outer diameter of the first core punching sheet is smaller than the outer diameter of the third core punching sheet.

3. The stator core according to claim 1, wherein: The plurality of first oil passages extend along a first direction respectively, and the plurality of second oil passages extend along the first direction respectively, and the first direction is inclined with respect to the axial direction.

4. The stator core according to claim 1, wherein: The first recess of each second core punching sheet group partially overlaps with the adjacent first protrusion and the adjacent first recess in the axial direction; The second recessed portion of each of the third core sheet groups partially overlaps with the adjacent second protrusions and adjacent second recessed portions in the axial direction.

5. The stator core according to claim 1, wherein: The stator core includes a first oil spray ring and a second oil spray ring. Along the axial direction, the first oil spray ring is connected to and communicated with the first recess at the outermost end, and the second oil spray ring is connected to and communicated with the second recess at the outermost end. The first oil spray ring and the second oil spray ring are used to spray external cooling oil onto the external winding.

6. The stator core according to claim 1, wherein: Each of the second core punching sheets includes 16 of the first protrusions and 16 of the first recesses, and each of the third core punching sheets includes 16 of the second protrusions and 16 of the second recesses.

7. The stator core according to claim 1, wherein: Each of the first core punching sheets includes 48 slots and 48 teeth, each of the second core punching sheets includes 48 slots and 48 teeth, and each of the third core punching sheets includes 48 slots and 48 teeth.

8. A motor, characterized in that: The motor comprises: The stator core according to any one of claims 1 to 7; a winding connected to the slot portion of the stator core; The stator core is arranged in the housing, and the housing is connected to the stator core.

9. The motor according to claim 8, characterized in that The housing includes an oil inlet, which is communicated with the oil inlet channel of the stator core.

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