Stator core and motor

Abstract

The utility model discloses a stator iron core, comprising a plurality of first iron core punching sheets, each first iron core punching sheet comprises a plurality of groups of oil inlets and a first oil inlet channel, and the first oil inlet channel comprises a first part and a second part; each second iron core punching sheet comprises a plurality of oil hole groups, and each oil hole group comprises a first hole, a second hole and a third hole; the plurality of first parts form a first oil inlet path, and the plurality of second parts form a second oil inlet path; and in each second iron core punching sheet group, the plurality of first holes form a first oil path, the plurality of second holes form a second oil path, the plurality of third holes form a third oil path, the first oil path and the second oil path are respectively communicated with the first oil inlet path, and the third oil path is communicated with the second oil inlet path. According to the utility model, a plurality of groups of oil paths can be formed through the two kinds of iron core punching sheets to cool the stator iron core and the winding, oil ducts and oil rings are omitted, the number of parts is reduced, the material cost is reduced, and the cooling effect is improved. The utility model also provides a motor.

Description

Technical Field

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

[0002] Conventional methods for cooling the stator core in motors typically involve adding an additional oil channel structure to the radially outer surface of the stator core. Within this oil channel structure, cooling oil cools the stator core through axial direct flow or staggered turbulent flow. This cooling method requires an additional oil channel structure, resulting in high material costs and complex processes.

[0003] As for the cooling method of the winding in the motor, an oil ring structure is installed outside the end of the stator core to cool the winding through the oil ring structure. This cooling method has high material cost and poor cooling effect. Utility Model Content

[0004] The present invention aims to address the high material cost associated with existing stator core and winding cooling methods. This invention provides a stator core that utilizes two core punchings to form multiple oil paths for cooling the stator core and windings. This eliminates the oil channel and oil ring structures found in existing technologies, reduces the number of components, lowers material costs, and improves cooling efficiency.

[0005] In order to solve the above technical problems, the embodiment of the present utility model discloses a stator core, which includes:

[0006] a plurality of first core punchings, each of the first core punchings comprising a plurality of groups of oil inlets and a first oil inlet channel arranged circumferentially, the first oil inlet channel comprising a first portion and a second portion, the oil inlet communicating with the first portion, the first portion extending inwardly from a peripheral edge of the first core punching, the second portion intersecting and communicating with the first portion;

[0007] Two second core punching sheet groups, each of which is provided with a second core punching sheet group at both ends of the plurality of first core punching sheets along the axial direction, and each second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction;

[0008] Each of the second core punching sheets includes a plurality of oil hole groups arranged around the circumference, and the oil hole groups include a first hole, a second hole and a third hole arranged at intervals; wherein,

[0009] After the plurality of first core punching sheets are stacked in the axial direction, the first portions of the corresponding plurality of first oil inlet channels form a first oil inlet path, and the second portions of the corresponding plurality of first oil inlet channels form a second oil inlet path;

[0010] In each of the second core punching sheet groups, the corresponding multiple first holes of the multiple second core punching sheets form a first oil circuit, the corresponding multiple second holes form a second oil circuit, and the corresponding multiple third holes form a third oil circuit. The first oil circuit and the second oil circuit are respectively connected to the first oil inlet circuit, and the third oil circuit is connected to the second oil inlet circuit.

[0011] With this technical solution, cooling oil flows from the first oil inlet channel to the first, second, and third holes. The first and second holes radially correspond to the teeth, while the third hole radially corresponds to the slots. The windings are located in the slots of the stator core and abut the teeth. Therefore, as the cooling oil flows through the first, second, and third oil paths, it passes through the teeth and the bottom ends of the slots of the stator core, removing heat generated by the windings and cooling the stator core.

[0012] In addition, the cooling oil passing through the first oil circuit, the second oil circuit and the third oil circuit is respectively sprayed out from the first hole, the second hole and the third hole on the second core punching plate at both ends of the stator core, and sprayed onto the winding to cool the winding. It is no longer necessary to install an oil ring structure outside the end of the stator core, which can improve the cooling effect while reducing the number of parts and reducing material costs.

[0013] Because the first core punching sheet is provided with a first oil inlet channel, and the second core punching sheet is provided with a first hole, a second hole, and a third hole, the multiple oil passages formed by this arrangement can satisfy the flow of cooling oil in the stator core, thereby achieving cooling of the stator core. 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 achieve cooling of the stator core while reducing the number of components and material costs.

[0014] The oil flow direction of the cooling oil in the stator core is as follows: the cooling oil enters the first oil inlet passage and the second oil inlet passage of multiple first core punching sheets in the radial direction from the oil inlet, and then in the axial direction, a part of the cooling oil enters the first oil passage and the second oil passage of the second core punching sheet group through the first oil inlet passage, and finally the cooling oil flows out through the first hole and the second hole; the other part of the cooling oil enters the third oil passage of the second core punching sheet group through the second oil inlet passage, and finally the cooling oil flows out through the third hole, thereby cooling the winding and the stator core.

[0015] According to another specific embodiment of the present invention, the diameter of the second core punching sheet is greater than the diameter of the first core punching sheet, and an oil inlet groove is formed between the two second core punching sheet groups and the multiple first core punching sheets. The oil inlet groove is connected to the oil inlet port, and the oil inlet groove is used to connect with the oil inlet channel of the external shell.

[0016] By adopting the above technical solution, the cooling oil flows from the oil inlet channel of the housing to the oil inlet groove, and then enters the stator core from the oil inlet.

[0017] According to another specific embodiment of the present invention, the first portion of the first oil inlet channel extends in a radial direction, and the first hole and the second hole are spaced apart in the radial direction.

[0018] According to another specific embodiment of the present invention, the end of the first portion extends to the tooth portion of the first core punching sheet.

[0019] According to another specific embodiment of the present invention, the position of the first hole corresponds to the end of the first part, and / or the position of the second hole corresponds to the intersection of the first part and the second part.

[0020] By adopting the above technical solution, the cooling oil can be sprayed onto the winding at a relatively close distance, thereby improving the cooling efficiency of the winding.

[0021] According to another specific embodiment of the present invention, the second portion of the first oil inlet channel and the first portion are intersected at an acute angle on the extension end side.

[0022] With the above technical solution, since the second portion is connected to the third oil circuit formed by the plurality of third holes, if the second portion and the first portion are arranged to intersect at an obtuse angle, the third holes will be away from the ends of the slots of the stator core, and the windings are arranged in the slots of the stator core. That is, the cooling oil flowing in the third oil circuit will be away from the windings, reducing the cooling effect on the windings.

[0023] According to another specific embodiment of the present invention, the end of the second portion extends to the bottom end of the groove portion of the first core punching sheet.

[0024] By adopting the above technical solution, the first oil inlet channel can guide the cooling oil to a portion of the stator core that is closer to the winding, so as to cool the stator core more efficiently.

[0025] According to another specific embodiment of the present invention, the position of the third hole corresponds to the end of the second part.

[0026] By adopting the above technical solution, the cooling oil can be sprayed onto the winding at a relatively close distance, thereby improving the cooling efficiency of the winding.

[0027] According to another specific embodiment of the present invention, the axial projection of the first hole, the second hole or the third hole on the first core punching sheet does not exceed the occupied area of ​​the first oil inlet channel.

[0028] By adopting the above technical solution, the size of each hole in all directions is no larger than, or even smaller than, the size of the corresponding portion of each portion of the first oil inlet channel. This helps accelerate the flow of cooling oil in the second core punching group and also makes the punching area of ​​the second core punching smaller than that of the first core punching.

[0029] The embodiment of the present utility model further discloses a motor, comprising:

[0030] The stator core according to any one of the preceding items;

[0031] a winding connected to the slot portion of the stator core;

[0032] The stator core is arranged in the housing, and the housing is connected to the stator core.

[0033] According to another specific embodiment of the present invention, the housing includes a second oil inlet channel, and the second oil inlet channel is connected to the oil inlet groove formed by the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram showing the connection between the housing and the stator core of an embodiment of the present utility model is shown.

[0035] 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.

[0036] Figure 3 A three-dimensional view of a stator core according to an embodiment of the present invention is shown.

[0037] Figure 4 A side view of a stator core according to an embodiment of the present invention is shown.

[0038] Figure 5A A schematic diagram of the oil circuit group according to an embodiment of the present invention is shown.

[0039] Figure 5B A connection diagram of the first oil inlet circuit, the second oil inlet circuit, the first oil circuit, the second oil circuit and the third oil circuit in an embodiment of the present utility model is shown.

[0040] Figure 6A A schematic diagram showing the first core punching sheet of an embodiment of the present utility model is shown.

[0041] Figure 6B Showing the embodiment of the utility model Figure 6A A partial enlarged view of area A in the middle.

[0042] Figure 7A A schematic diagram showing the second core punching sheet of an embodiment of the present utility model is shown.

[0043] Figure 7B Showing the embodiment of the utility model Figure 7A A partial enlarged view of area B in the middle.

[0044] Figure 8A A cross-sectional view of a stator core according to an embodiment of the present invention is shown.

[0045] Figure 8B Showing the embodiment of the utility model Figure 8A A partial enlarged view of the middle C area.

[0046] Description of Reference Numerals

[0047] stator core 100;

[0048] Groove portion 110, bottom end 111;

[0049] tooth portion 120;

[0050] First core punching sheet group 130; first core punching sheet 131; second oil inlet 1311; first oil inlet channel 1312; first portion 13121; second portion 13122;

[0051] Second core punching sheet group 140; second core punching sheet 141; oil hole group 1411; first hole 14111; second hole 14112; third hole 14113;

[0052] Oil circuit group 150; first oil inlet oil circuit 151; second oil inlet oil circuit 152; first oil circuit 153; second oil circuit 154; third oil circuit 155;

[0053] Oil inlet groove 160;

[0054] Winding 200;

[0055] Housing 300 ; first oil inlet 310 ; second oil inlet channel 320 . DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0060] 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.

[0061] 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.

[0062] refer to Figures 1 to 3The present application provides a motor (not shown) including a stator core 100, a winding 200, and a housing 300. In a specific example, the stator core 100 includes forty-eight slots 110 and forty-eight teeth 120. The winding 200 is disposed in the slots 110 of the stator core 100 and can abut against the teeth 120.

[0063] The stator core 100 is disposed within a housing 300, which is connected to the stator core 100. The stator core 100 includes forty-eight circumferentially arranged groups of first oil inlet channels 1312 and one oil inlet groove 160. All first oil inlet channels 1312 and the oil inlet grooves 160 are interconnected. The housing 300 includes a first oil inlet port 310 and a second oil inlet channel 320, which is connected to the oil inlet grooves 160 of the stator core 100.

[0064] Using the above technical solution, refer to Figure 1 and Figure 3 , the direction of cooling oil a (such as Figure 1 As shown by the dotted arrows, the cooling oil enters the second oil inlet channel 320 from the first oil inlet port 310 of the housing 300, and then flows leftward and rightward in the second oil inlet channel 320, and then flows back to the oil inlet groove 160 of the stator core 100, and then flows out from the first oil inlet channel 1312 (as shown in FIG. Figure 3 As shown) enters the stator core 100.

[0065] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of slots 110 and teeth 120 of the stator core 100. For example, in other possible embodiments, the number of slots 110 and teeth 120 of the stator core 100 can be 24, 54, 72, etc. The embodiment of the present application does not impose any specific limitation on the number of first oil inlet passages 1312. For example, in other possible embodiments, the number of first oil inlet passages 1312 can be 24, 54, 72, etc. The number of first oil inlet passages 1312 is determined by the number of slots 110 of the stator core 100.

[0066] Next, the stator core 100 will be explained in detail.

[0067] refer to Figures 3 to 5B The stator core 100 includes a first core punching group 130 and two second core punching groups 140, and an oil passage group 150 is formed in the stator core 100. Each first core punching group 130 includes, for example, forty first core punchings 131 (e.g., Figure 6A As shown), each second core punching sheet group 140 includes, for example, two hundred second core punching sheets 141 stacked in the axial direction (as shown in FIG. Figure 7AAlong the axial direction, a second core punching group 140 is respectively provided at both ends of the first core punching group 130.

[0068] refer to Figures 5A to 6B Each first core punching sheet 131 includes forty-eight groups of circumferentially arranged second oil inlets 1311, which are connected to the first oil inlet channel 1312. The first oil inlet channel 1312 is in the shape of a "human" and includes a first portion 13121 and a second portion 13122. The second oil inlet 1311 is connected to the first portion 13121, and the second portion 13122 is arranged to intersect and connect with the first portion 13121. The first portion 13121 extends inward from the periphery of the first core punching sheet 131, and the second portion 13122 extends sideways from the intersection with the first portion 13121. In the first core punching sheet group 130, the first portions 13121 of the forty first oil inlet channels 1312 in corresponding positions form the first oil inlet path 151, and the second portions 13122 of the forty first oil inlet channels 1312 in corresponding positions form the second oil inlet path 152.

[0069] refer to Figure 5B 、 Figure 7A and Figure 7B Each second core punching sheet 141 includes forty-eight groups of oil holes 1411 arranged circumferentially. Each oil hole group 1411 includes a first hole 14111, a second hole 14112, and a third hole 14113 spaced apart from one another. The first holes 14111 and the second holes 14112 are radially spaced apart and correspond radially to the teeth 120 of the second core punching sheet 141. The third holes 14113 correspond radially to the grooves 110 of the second core punching sheet 141. In each second core punching sheet group 140, the two hundred corresponding first holes 14111 form a first oil passage 153, the two hundred corresponding second holes 14112 form a second oil passage 154, and the two hundred corresponding third holes 14113 form a third oil passage 155. The first oil passage 153 and the second oil passage 154 are respectively communicated with the first oil inlet passage 151 , and the third oil passage 155 is communicated with the second oil inlet passage 152 .

[0070] Using the above technical solution, cooling oil flows from the first oil inlet channel 1312 to the first hole 14111, the second hole 14112, and the third hole 14113. The first hole 14111 and the second hole 14112 radially correspond to the teeth 120, and the third hole 14113 radially corresponds to the slot 110. The winding 200 is disposed in the slot 110 of the stator core 100 and abuts the teeth 120. Therefore, as the cooling oil flows through the first oil path 153, the second oil path 154, and the third oil path 155, it passes through the teeth 120 of the stator core 100 and the bottom end 111 of the slot 110, thereby removing heat generated by the winding 200 and cooling the stator core 100. In addition, the cooling oil passing through the first oil circuit 153, the second oil circuit 154 and the third oil circuit 155 is respectively sprayed out from the first hole 14111, the second hole 14112 and the third hole 14113 on the second core punching sheet 141 at both ends of the stator core 100, and sprayed onto the winding 200, thereby cooling the winding 200. It is no longer necessary to add an oil ring structure on the end of the stator core 100, which can improve the cooling effect while reducing the number of parts and reducing material costs.

[0071] Since the first core punching sheet 131 is provided with the first oil inlet channel 1312, and the second core punching sheet 141 is provided with the first hole 14111, the second hole 14112, and the third hole 14113, the multiple oil passages formed by this arrangement can satisfy the flow of cooling oil in the stator core 100, thereby cooling the stator core 100. Therefore, it is no longer necessary to add an additional layer of oil passage structure on the radial outer surface of the stator core 100 to cool the stator core 100. This can reduce the number of components and material costs while achieving cooling of the stator core 100.

[0072] refer to Figure 4 、 Figure 5B and Figure 6B , the direction of the cooling oil in the stator core 100 (such as Figure 5B The cooling oil is supplied from the second oil inlet 1311 in the radial direction ( Figure 5B The cooling oil enters the first oil inlet passage 151 of the first core punching sheet group 130 in the X direction, and then a portion of the cooling oil is discharged in the axial direction ( Figure 5BIn the Y direction, the cooling oil enters the second oil circuit 154 of the second core punching group 140 to the left and right respectively (i.e., the direction of the cooling oil is: b→c); a part of the cooling oil continues downward in the first oil inlet circuit 151, and then enters the first oil circuit 153 to the left and right in the axial direction (i.e., the direction of the cooling oil is: b→d→e); another part of the cooling oil in the first oil inlet circuit 151 enters the second oil inlet circuit 152 in the radial direction, and then enters the third oil circuit 155 of the second core punching group 140 to the left and right in the axial direction (i.e., the direction of the cooling oil is: b→f→g), thereby cooling the stator core 100.

[0073] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of first core punches 131 included in each first core punching group 130. For example, in other possible implementations, the number of first core punches 131 included in each first core punching group 130 can be thirty, thirty-five, forty-five, etc. The embodiment of the present application does not impose any specific restrictions on the number of second core punches 141 included in each second core punching group 140. For example, in other possible implementations, the number of second core punches 141 included in each second core punching group 140 can be one hundred and eighty, one hundred and ninety, two hundred and ten, etc. The embodiment of the present application does not impose any specific restrictions on the number of first holes 14111, second holes 14112, and third holes 14113 in corresponding positions, which are determined by the number of second core punches 141.

[0074] In some possible implementations, reference Figure 4 、 6A to 7A The diameter d2 of the second core punching sheet 141 is greater than the diameter d1 of the first core punching sheet 131 . An oil inlet groove 160 is formed between the two second core punching sheet groups 140 and the first core punching sheet group 130 . The oil inlet groove 160 is connected to the second oil inlet port 1311 .

[0075] With the above technical solution, the cooling oil flows from the second oil inlet channel 320 of the housing 300 to the oil inlet groove 160 , and then enters the stator core 100 from the second oil inlet port 1311 .

[0076] In some possible implementations, reference Figure 8A and Figure 8B First portion 13121 of first oil inlet passage 1312 extends radially, first hole 14111 is located corresponding to the end of first portion 13121, third hole 14113 is located corresponding to the end of second portion 13122, and second hole 14112 is radially spaced apart from first hole 14111. In one example, second hole 14112 is located corresponding to the intersection of first portion 13121 and second portion 13122.

[0077] By adopting the above technical solution, the cooling oil can be sprayed onto the winding 200 at a relatively close distance, thereby improving the cooling efficiency of the winding 200 .

[0078] In some possible implementations, reference Figure 6B The second portion 13122 of the first oil inlet channel 1312 and the first portion 13121 are intersected at an acute angle at the extending end side.

[0079] With the above technical solution, since the second portion 13122 is connected to the third oil circuit 155 formed by two hundred third holes 14113, if the second portion 13122 and the first portion 13121 are arranged to intersect at an obtuse angle, the third holes 14113 at this time will be away from the slot portion 110 of the stator core 100, and the winding 200 is arranged in the slot portion 110 of the stator core 100, that is, the cooling oil flowing in the third oil circuit 155 will be away from the winding 200, thereby reducing the cooling effect on the winding 200.

[0080] In some possible implementations, reference Figure 6A and Figure 6B The end of the first portion 13121 extends to the tooth portion 120 of the first core sheet 131, and may, for example, extend beyond the bottom end 111 of the slot portion 110, that is, be closer to the center of the first core sheet 131 than the bottom end 111 of the slot portion 110. The end of the second portion 13122 extends to the bottom end 111 of the slot portion 110 of the first core sheet 131, but does not communicate with the slot portion 110.

[0081] By adopting the above technical solution, the first oil inlet channel 1312 can guide the cooling oil to the portion of the stator core 100 that is closer to the winding 200 , so as to cool the stator core 100 more efficiently.

[0082] In some possible implementations, reference Figure 8A and Figure 8B The axial projections of the first hole 14111 , the second hole 14112 and the third hole 14113 on the first core punching sheet 131 do not exceed the occupied area of ​​the first oil inlet channel 1312 .

[0083] By adopting the above technical solution, the size of each hole in each direction is no larger than, or even smaller than, the size of the corresponding portion of each portion of the first oil inlet channel 1312. This helps accelerate the flow of cooling oil in the second core punching group 140 and also makes the punching area of ​​the second core punching 141 smaller than the punching area of ​​the first core punching 131.

[0084] In some possible implementations, reference Figures 2 to 4The thickness of the first core punching group 130 formed by axially stacking multiple first core punching sheets 131 is less than the axial thickness of each second core punching group 140. In one example, the thickness of the first core punching group 130 is less than 1 / 5 of the thickness of each second core punching group 140.

[0085] By adopting the above technical solution, in the stator core 100 , most of the core punching sheets used are the second core punching sheets 141 with a small punching area, so that the entire stator core 100 has better electrical performance.

[0086] 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 plurality of first core punchings, each of the first core punchings comprising a plurality of groups of oil inlets and a first oil inlet channel arranged circumferentially, the first oil inlet channel comprising a first portion and a second portion, the oil inlet communicating with the first portion, the first portion extending inwardly from a peripheral edge of the first core punching, the second portion intersecting and communicating with the first portion; Two second core punching sheet groups, each of which is provided with a second core punching sheet group at both ends of the plurality of first core punching sheets along the axial direction, and each second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction; Each of the second core punching sheets includes a plurality of oil hole groups arranged around the circumference, and the oil hole groups include a first hole, a second hole and a third hole arranged at intervals; wherein, After the plurality of first core punching sheets are stacked in the axial direction, the first portions of the corresponding plurality of first oil inlet channels form a first oil inlet path, and the second portions of the corresponding plurality of first oil inlet channels form a second oil inlet path; In each of the second core punching sheet groups, the corresponding multiple first holes of the multiple second core punching sheets form a first oil circuit, the corresponding multiple second holes form a second oil circuit, and the corresponding multiple third holes form a third oil circuit. The first oil circuit and the second oil circuit are respectively connected to the first oil inlet circuit, and the third oil circuit is connected to the second oil inlet circuit.

2. The stator core according to claim 1, wherein: The diameter of the second core punching sheet is greater than the diameter of the first core punching sheet. An oil inlet groove is formed between the two second core punching sheet groups and the multiple first core punching sheets. The oil inlet groove is connected to the oil inlet port. The oil inlet groove is used to connect with the oil inlet channel of the external shell.

3. The stator core according to claim 1, wherein: The first portion of the first oil inlet passage extends in a radial direction, and the first hole and the second hole are spaced apart in the radial direction.

4. The stator core according to claim 3, wherein: The end of the first portion extends to the tooth portion of the first core punching sheet.

5. The stator core according to claim 3, wherein: The first hole is located corresponding to an end of the first portion, and / or the second hole is located corresponding to an intersection of the first portion and the second portion.

6. The stator core according to claim 1, wherein: The second portion of the first oil inlet passage intersects the first portion at an acute angle at the extending end side.

7. The stator core according to claim 6, wherein: The end of the second portion extends to the bottom end of the groove portion of the first core punching sheet.

8. The stator core according to claim 6, wherein: The position of the third hole corresponds to the end of the second portion.

9. The stator core according to claim 1, wherein: Axial projections of the first hole, the second hole, or the third hole on the first core punching sheet do not exceed an area occupied by the first oil inlet channel.

10. A motor, characterized in that: The motor comprises: The stator core according to any one of claims 1 to 9; 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.

11. The motor according to claim 10, wherein The housing includes a second oil inlet passage, and the second oil inlet passage is communicated with an oil inlet groove formed in the stator core.

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