Stator core, motor, and vehicle

Abstract

This disclosure relates to a stator core, an electric motor, and a vehicle. The stator core includes: a first core segment located in the middle and having an oil inlet chamber; a second core segment located at an end and having an end oil spray port; and a third core segment located between the first and second core segments and having an internal cooling channel; the internal cooling channel connects the oil inlet chamber and the end oil spray port; wherein the diameter of the first core segment is smaller than the diameter of the second core segment, and the diameter of the second core segment is smaller than the diameter of the third core segment. The stator core of this disclosure can improve the flexibility and efficiency of its assembly with the housing while ensuring strength and heat dissipation performance.

Description

Technical Field

[0001] This disclosure relates to the field of motor stators, specifically to a stator core, a motor, and a vehicle. Background Technology

[0002] As a core component of new energy vehicles, improving the motor's heat dissipation capacity has become a key research focus in the industry to enhance its continuous power output. Motor cooling methods are mainly categorized into oil cooling, air cooling, and water cooling. With the continuous increase in the power density of electric drives in new energy vehicles, the heat generated by the stator core is gradually increasing, highlighting the significant advantages of oil cooling technology. However, in this technology, the connection between the stator core and the housing is relatively inconvenient, affecting the overall assembly efficiency of the motor. Utility Model Content

[0003] The purpose of this disclosure is to provide a stator core, an electric motor, and a vehicle, wherein the stator core is easily connected to a housing to at least partially solve the aforementioned technical problems.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a stator core, comprising: a first core segment located in the middle and having an oil inlet cavity; a second core segment located at an end and having an end oil spray port; and a third core segment located between the first core segment and the second core segment and having an internal cooling channel; the internal cooling channel connects the oil inlet cavity and the end oil spray port; wherein the diameter of the first core segment is smaller than the diameter of the second core segment, and the diameter of the second core segment is smaller than the diameter of the third core segment. The larger diameter of the third core segment improves the structural strength of the stator core and increases the diversity of assembly methods between the stator core and the housing, ensuring assembly flexibility and efficiency; the smaller diameter of the first core segment facilitates the entry of cooling oil into the oil inlet cavity through the oil inlet on the motor housing and facilitates subsequent cooling oil flow; the diameter of the second core segment is between that of the first and third core segments, ensuring the structural strength of the stator core ends while facilitating the installation of the stator core ends and improving assembly efficiency.

[0005] In some possible implementations, the internal cooling channels extend axially along the stator core and are located close to the outer wall of the third core segment. This facilitates cooling of the outer side of the stator core by the cooling oil and, to some extent, increases the distance between the cooling oil flowing from the internal cooling channels to the end spray nozzles and the axis of the stator core. This allows the cooling oil sprayed from the end spray nozzles to have a larger coverage area, thereby facilitating cooling of the stator windings.

[0006] In some possible implementations, the first core segment includes at least one first lamination, the second core segment includes at least one second lamination, and the third core segment includes a plurality of third laminations stacked sequentially between the first and second laminations; the diameter of the first lamination is smaller than the diameter of the second lamination, and the diameter of the second lamination is smaller than the diameter of the third lamination. The stator core is composed of multiple stacked laminations, which can improve motor efficiency and performance, and also offers advantages such as ease of manufacturing, reduced cost, improved heat dissipation, and reduced noise.

[0007] In some possible implementations, there are multiple internal cooling channels arranged at circumferential intervals along the second core segment; the oil inlet cavity includes an annular cavity formed on the circumferential outer wall of the first core segment; the multiple internal cooling channels are respectively connected to the annular cavity. This arrangement allows the cooling oil located in the annular cavity to flow quickly and evenly into the interior of the stator core, thereby improving the heat dissipation efficiency of the stator core.

[0008] In some possible implementations, there are multiple end oil spray ports, arranged circumferentially along the end face of the second core segment, with each internal cooling channel correspondingly connected to at least one end oil spray port. This allows the cooling oil to be sprayed onto the stator windings as evenly as possible, thereby improving the heat dissipation efficiency of the stator windings.

[0009] In some possible implementations, the second core segment includes a plurality of second laminations stacked alternately in the axial direction of the stator core. Each second lamination has a plurality of end oil nozzles evenly arranged circumferentially along the second lamination. The radial distance from the center of the plurality of end oil nozzles to the axis of the second lamination decreases sequentially, forming an oil spray channel extending toward the axis of the second core segment. The outlet of the oil spray channel thus formed can be directed toward the stator winding, facilitating concentrated spraying of cooling oil onto the stator winding, thereby improving the cooling effect of the cooling oil on the stator winding.

[0010] In some possible implementations, the plurality of end oil nozzles are divided into multiple nozzle groups arranged circumferentially, each nozzle group including at least two end oil nozzles of different shapes. The arrangement of the nozzle groups allows the cooling oil to be concentrated and sprayed into a local area of ​​the stator core, thereby improving the cooling effect on the stator windings.

[0011] In some possible implementations, the end oil injection port includes at least two of a Z-shaped hole, a cross-shaped hole, and an elongated hole. The shape of the end oil injection port can be adaptively adjusted according to actual needs to ensure effective cooling of the stator windings.

[0012] In some possible implementations, the outer circumferential surface of the third core segment is provided with a mounting structure for fixed connection with the housing. This mounting structure facilitates the connection between the third core segment and the motor housing, thereby improving the assembly efficiency of the stator core.

[0013] In some possible implementations, the mounting structure includes a first interference fit for mating with the housing; or, the mounting structure includes a first mating key or a first mating groove key; or, the mounting structure includes a lug with mounting holes. That is, the stator core and the motor housing can have multiple assembly methods, thereby ensuring assembly flexibility and efficiency.

[0014] A second aspect of this disclosure provides an electric motor including the aforementioned stator core.

[0015] A third aspect of this disclosure provides a vehicle including the aforementioned motor.

[0016] Through the above technical solution, the diameter of the first core segment of this disclosure is relatively small, which facilitates the flow of cooling oil into the oil inlet chamber of the first core segment; the diameter of the second core segment is smaller than that of the third core segment, which facilitates the insertion of the end of the stator core into the motor housing, thereby improving the installation efficiency between the stator core and the motor housing to a certain extent; the diameter of the third core segment is larger than that of the first and third core segments, which increases the volume of the stator core, thereby improving the structural strength of the stator core to a certain extent. Furthermore, this arrangement of the third core segment ensures the flow rate of the cooling medium that can pass through its internal cooling channels, improving the heat dissipation performance of the stator core and stator windings. In addition, the large-diameter third core segment can be positioned closer to the motor housing, thus facilitating the assembly between the stator core and the motor housing. Based on this, the stator core of this disclosure can improve the flexibility and efficiency of its assembly with the housing while ensuring strength and heat dissipation performance.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the first embodiment of the stator core provided in this disclosure; Figure 2 This is a cross-sectional view of a portion of a first embodiment of the stator core provided in this disclosure; Figure 3 This is a schematic diagram of the structure of the second embodiment of the stator core provided in this disclosure; Figure 4 This is a cross-sectional view of a portion of a second embodiment of the stator core provided in this disclosure; Figure 5 This is a schematic diagram of the third embodiment of the stator core provided in this disclosure; Figure 6 This is a cross-sectional view of a portion of the third embodiment of the stator core provided in this disclosure; Figure 7 This is a schematic diagram of the fourth embodiment of the stator core provided in this disclosure; Figure 8 This is a cross-sectional view of a portion of the fourth embodiment of the stator core provided in this disclosure.

[0019] Explanation of reference numerals in the attached figures 1-Oil inlet chamber; 2-End oil injection port; 3-First mating key; 4-Ear seat; 401-Mounting hole; 100-First iron core section; 110-First lamination; 200-Second iron core section; 210-Second lamination; 300-Third iron core section; 310-Third lamination; 400-Annular cavity; 500-Oil injection port assembly; 600-Mounting structure. Detailed Implementation

[0020] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0021] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to "inner" and "outer" relative to the contour of the corresponding component itself. Furthermore, the terms "first," "second," and "third," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. Additionally, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0022] The stator core in the exemplary embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0023] refer to Figures 1 to 8As shown, in a first aspect, a stator core is provided, comprising: a first core segment 100 located in the middle and having an oil inlet chamber 1; a second core segment 200 located at an end and having an end oil spray port 2; and a third core segment 300 located between the first core segment 100 and the second core segment 200 and having an internal cooling channel; the internal cooling channel connects the oil inlet chamber 1 and the end oil spray port 2; wherein the diameter of the first core segment 100 is smaller than the diameter of the second core segment 200, and the diameter of the second core segment 200 is smaller than the diameter of the third core segment 300.

[0024] After passing through the oil inlet of the housing, the cooling oil can enter the oil inlet chamber 1 of the first iron core section 100. The oil inlet chamber 1 can be arranged circumferentially along the first iron core section 100. While flowing in the oil inlet chamber 1, the cooling oil can also enter the internal cooling channels of the third iron core section 300 located on both sides of it, and then be sprayed out through the end oil spray port 2. In this way, the cooling oil can simultaneously exchange heat with the stator iron core and the stator windings located at both ends, thereby ensuring the heat dissipation efficiency of the stator iron core and the stator windings.

[0025] In particular, because the third core segment 300 with internal cooling channels has a larger diameter, the volume of the stator core can be increased, thereby improving the structural strength of the stator core to a certain extent. Moreover, the third core segment 300 with this configuration has more internal space to accommodate more and / or larger flow internal cooling channels, thereby improving the heat dissipation performance of the stator core and stator windings. In addition, the large-diameter third core segment 300 can be positioned closer to the motor housing, facilitating the assembly of the third core segment 300 with the motor housing in various ways, increasing the diversity of assembly methods between the stator core and the housing, and ensuring assembly flexibility and efficiency.

[0026] The first core segment 100 has the smallest diameter, allowing sufficient space between the housing and the first core segment 100 to facilitate the flow of cooling oil into the oil inlet chamber 1 through the oil inlet and subsequent circulation of cooling oil on the stator core. The diameter of the second core segment 200 is between that of the first core segment 100 and the third core segment 300, which allows the second core segment 200 to have a certain structural strength and to have more end oil spray ports 2. In addition, this also facilitates the insertion of the stator core end into the motor housing, thereby ensuring the end strength and cooling efficiency of the stator core while also improving the assembly efficiency of the stator core to a certain extent.

[0027] In addition, while ensuring the structural strength of the stator core and the assembly efficiency between it and the motor housing, it can also improve the situation of lamination warping on the outer diameter of the core to a certain extent, thus ensuring the overall aesthetics of the stator core and the motor.

[0028] In some possible implementations, the internal cooling channels may extend axially along the stator core and be positioned close to the outer wall of the third core section 300. This facilitates cooling of the outer side of the stator core by the cooling oil and, to a certain extent, increases the distance between the cooling oil flowing from the internal cooling channels to the end oil spray port 2 and the axis of the stator core, allowing the cooling oil sprayed from the end oil spray port 2 to have a larger coverage area, thereby facilitating the cooling of the stator windings.

[0029] In embodiments of this disclosure, such as Figures 1 to 8 As shown, the third core segment 300 has a mounting structure 600 formed on its outer circumference for fixed connection with the housing. Since the third core segment 300 has the largest diameter, it is the area of ​​the stator core closer to the motor housing. Therefore, the mounting structure 600 on the third core segment 300 facilitates the connection between the third core segment 300 and the motor housing, thereby improving the assembly efficiency of the stator core.

[0030] The mounting structure 600 can be configured in various forms as needed to connect the stator core and the motor housing.

[0031] For example, such as Figures 1 to 4 As shown, the mounting structure 600 may include a first interference fit for mating with the housing. The housing may have a second interference fit that can mate with the first interference fit. That is, the third core segment 300 and the motor housing can be connected together by an interference fit. By connecting the two in this way, the connection structure between them can be reduced, thereby improving assembly efficiency and reducing assembly costs to a certain extent. In this case, a portion of the third core segment 300 can form the aforementioned first interference fit. In addition, since the third core segment 300 and the housing are in an interference fit, at least a portion of the two can fit tightly together, allowing the heat in the stator core to be effectively conducted away through the housing, improving the heat dissipation effect of the stator core. Furthermore, this can also make the stress distribution relatively uniform, avoiding stress concentration in local areas and improving the reliability of the structure.

[0032] In addition, such as Figure 5 and Figure 6As shown, the mounting structure 600 may include a first mating key 3 or a first mating groove key. That is, when the mounting structure 600 includes the first mating key 3, the motor housing may be provided with a first mating key groove that can mate with the first mating key 3. Alternatively, when the mounting structure 600 includes the first mating key groove, the motor housing may be provided with the first mating key 3. In other words, the third iron core segment 300 and the motor housing can be connected together by keyway mating. This connection method can ensure the stability of the stator iron core and the motor housing after connection, while improving the accuracy of their assembly, thereby improving the assembly efficiency of the stator iron core and the motor housing.

[0033] The third lamination 310 may have a raised area, and the raised areas of multiple stacked third laminations 310 may form the first mating key 3. Alternatively, the third lamination 310 may have a groove, and the grooves of multiple stacked third laminations 310 may form the first mating keyway.

[0034] The number and arrangement of the first mating key 3 or the first mating key slot can be adapted to the installation environment. For example, multiple first mating keys 3 or first mating key slots can be configured, and multiple first mating keys 3 or first mating key slots can be arranged at circumferential intervals along the third iron core segment 300.

[0035] Or, for example Figure 7 and Figure 8 As shown, the mounting structure 600 may include a lug 4 with a mounting hole 401. Correspondingly, the motor housing may also be provided with a mating hole that can cooperate with the mounting hole 401. In this way, the third core section 300 can be connected to the motor housing by fasteners such as bolts or screws. By connecting the stator core and the motor housing in this way, it is easier to disassemble and assemble the stator core, thereby improving the assembly efficiency between the stator core and the motor housing.

[0036] The third punch 310 may have a raised area with a mounting hole 401, and the raised areas with mounting holes 401 of multiple stacked third punches 310 can form the aforementioned ear seat 4.

[0037] The number and arrangement of the ear brackets 4 can be adapted to the installation environment. For example, multiple ear brackets 4 can be configured, and multiple ear brackets 4 can be arranged at circumferential intervals along the third iron core segment 300.

[0038] As can be seen, the configuration of this disclosure allows for multiple assembly methods between the stator core and the motor housing, thereby ensuring assembly flexibility and efficiency.

[0039] Furthermore, it should be noted that when the third core segment 300 has a mounting structure 600, such as the first mating key 3 or the lug 4, the diameter of the third core segment 300 is the inner diameter of the circle formed by the outer contour of the mounting structure 600. For example, the inner diameter of the circle with the farthest distance from the outer side of the first mating key 3 or the lug 4 to the axis of the third core segment 300 as the radius and the center of the third core segment 300 as the origin. When the mounting structure 600 of the third core segment 300 is a first interference part, such as an interference surface, the inner diameter of the outer circumference of the third core segment 300 is the diameter of the third core segment 300.

[0040] In embodiments of this disclosure, such as Figures 1 to 8 As shown, the first core segment 100 includes at least one first lamination 110, the second core segment 200 includes at least one second lamination 210, and the third core segment 300 includes a plurality of third laminations 310 stacked sequentially between the first lamination 110 and the second lamination 210. The diameter of the first lamination 110 is smaller than the diameter of the second lamination 210, and the diameter of the second lamination 210 is smaller than the diameter of the third lamination 310. That is, the stator core is composed of multiple stacked laminations, which minimizes core loss and improves motor efficiency and performance. Furthermore, since at least some of the laminations have the same structure, this arrangement facilitates lamination manufacturing. In addition, the core made from stator laminations also features convenient manufacturing, reduced cost, improved heat dissipation, and reduced noise.

[0041] The first lamination 110 of the first core section 100 may have a groove. The groove formed by stacking multiple first laminations 110 can form an oil inlet chamber 1. The size of the oil inlet chamber 1 may correspond to or be slightly larger than the size of the oil inlet on the housing. This allows the cooling oil to fall fully into the oil inlet chamber 1, ensuring the amount of oil entering the oil inlet chamber 1 and improving the cooling efficiency of the stator core and stator winding.

[0042] The second lamination 210 of the second core section 200 may be provided with an opening. The opening on one or more stacked second laminations 210 forms the end oil spray port 2. When the second core section 200 is formed by stacking multiple second laminations 210, the openings between two adjacent second laminations 210 can be arranged at an angle to each other. For example, the opening on one second lamination 210 can be arranged radially along the second lamination 210, and the opening on the other second lamination 210 can extend in any direction on the second lamination 210, as long as the two openings overlap to a certain extent in the axial direction. In this way, after the cooling oil flows through the internal cooling channel and enters the end oil spray port 2, the flow area suddenly decreases and the pressure increases, so as to achieve the oil spraying effect, thereby cooling the stator winding at the end and improving the heat dissipation effect of the stator winding.

[0043] The third lamination 310 of the third core section 300 may be provided with a flow hole, and the flow holes on two adjacent third laminations 310 are respectively provided to form an internal cooling channel located inside the third core section 300.

[0044] In some possible implementations, there can be multiple internal cooling channels, arranged at circumferential intervals along the second core segment 200; the oil inlet chamber 1 includes an annular cavity 400 formed on the circumferential outer wall of the first core segment 100; the multiple internal cooling channels are respectively connected to the annular cavity 400. The circumferentially arranged oil inlet chamber 1 and multiple internal cooling channels allow the cooling oil located in the annular cavity 400 to flow quickly and evenly into the interior of the stator core, thereby improving the heat dissipation efficiency of the stator core.

[0045] In addition, such as Figure 1 , Figure 3 , Figure 5 , Figure 7 As shown, there can be multiple end oil spray ports 2, which are arranged circumferentially along the end face of the second core section 200. Each internal cooling channel is connected to at least one end oil spray port 2. Multiple end oil spray ports 2 arranged circumferentially along the end face of the second core section 200 can spray cooling oil onto the stator winding as evenly as possible, thereby improving the heat dissipation efficiency of the stator winding.

[0046] In some possible implementations, the second core segment 200 may include a plurality of second laminations 210 stacked alternately in the axial direction of the stator core. Each second lamination 210 has a plurality of end oil nozzles 2 arranged uniformly in the circumference of the second lamination 210. The radial distance from the center of the plurality of end oil nozzles 2 to the axis of the second lamination 210 decreases sequentially, so as to form an oil spray channel extending toward the axis of the second core segment 200. The outlet of the oil spray channel thus formed can be directed toward the stator winding to facilitate concentrated spraying of cooling oil onto the stator winding, thereby improving the cooling effect of the cooling oil on the stator winding.

[0047] For example, the second core segment 200 may include three stator cores stacked alternately in the axial direction of the second laminations 210. The three second laminations 210 may be second lamination a, second lamination b, and second lamination c in sequence. Each second lamination 210 may be provided with three end oil spray ports 2. The three end oil spray ports 2 may be end oil spray port a, end oil spray port b, and end oil spray port c, respectively, and the radial distance from the end oil spray port a, end oil spray port b, and end oil spray port c to the axis of the lamination they belong to decreases in sequence. After the second laminations a, second lamination b, and second lamination c are stacked alternately, the end oil spray port a on the second lamination a may be correspondingly set to the end oil spray port b on the second lamination b, and the end oil spray port c on the second lamination c may be correspondingly set to the end oil spray port b on the second lamination b, thereby forming the above-mentioned oil spray channel.

[0048] It should be noted that the number of the second stampings 210 and the number of end oil injection ports 2 provided on the second stampings 210 can be adjusted adaptively according to requirements, and this disclosure does not make specific limitations in this regard.

[0049] Among them, such as Figure 3 As shown, the multiple end oil nozzles 2 can be divided into multiple oil nozzle groups 500 arranged circumferentially, each oil nozzle group 500 including at least two end oil nozzles 2 with different shapes. The arrangement of the oil nozzle groups 500 allows the cooling oil to be concentrated and sprayed into a local area of ​​the stator core, thereby improving the cooling effect on the stator winding.

[0050] The different shape of the end oil spray nozzle 2 can change the flow area after the internal cooling channel enters the end oil spray nozzle 2. This can increase the pressure of the cooling oil, so that it can be sprayed onto the stator winding more fully, thereby improving the heat dissipation effect on the stator winding.

[0051] In addition, to further increase the flow rate of cooling oil that can be sprayed by the injector group 500, multiple injector groups 500 can also be arranged continuously in the circumferential direction.

[0052] For example, such as Figure 3 As shown, the end injection port 2 may include at least two of the following: a Z-shaped hole, a cross-shaped hole, and a long strip hole.

[0053] The shape of the end oil injection port 2 can be adaptively adjusted according to actual needs, such as the spray angle or range of cooling oil, to ensure the cooling effect on the stator winding. For example, the shapes of the end oil injection ports 2 in each oil injection port group 500 can be different, or some can be the same. Alternatively, the shapes of multiple end oil injection ports 2 in the same oil injection port group 500 can be the same, but the shapes of the end oil injection ports 2 between oil injection port groups 500 can be different.

[0054] A second aspect of this disclosure provides an electric motor including the aforementioned stator core. It should be noted that this motor possesses all the beneficial effects of the aforementioned stator core, which will not be elaborated upon here.

[0055] A third aspect of this disclosure provides a vehicle including the aforementioned motor. It should be noted that this motor possesses all the beneficial effects of the aforementioned motor, which will not be elaborated upon here.

[0056] In summary, this disclosure exemplarily illustrates the flow pattern of cooling oil in the stator core and its assembly with the motor housing.

[0057] Workers can use bolts or screws or other fasteners to connect the stator core and the motor housing through the lugs 4 on the third core section 300, which facilitates the disassembly and assembly of the stator core and the motor housing. Alternatively, workers can use the first mating key 3 on the third core section 300 to connect the stator core and the motor housing through a keyway fit, thereby ensuring that the stator core is accurately and stably connected to the housing. Or, the stator core and the housing can also be connected by an interference fit between the third core section 300 and the housing, thereby ensuring the structural strength and connection stability after the connection.

[0058] When cooling of the stator core and stator windings is required, cooling oil falls into the oil inlet chamber 1 of the first core section 100 through the oil inlet of the motor housing. Then, the cooling oil flows to the third core sections 300 on both sides, and enters the end oil spray port 2 on the second core section 200 through the internal cooling channel in the third core section 300. In this way, the cooling oil can simultaneously exchange heat with the stator core and the stator windings located at both ends, thereby ensuring the heat dissipation efficiency of the stator core and stator windings.

[0059] Based on this, the stator core disclosed herein can improve the flexibility and efficiency of its assembly with the housing while ensuring strength and heat dissipation performance.

[0060] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0062] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A stator core, characterized in that, include: A first iron core segment located in the middle and having an oil inlet chamber, a second iron core segment located at the end and having an end oil spray port, and a third iron core segment located between the first iron core segment and the second iron core segment and having an internal cooling channel; the internal cooling channel connects the oil inlet chamber and the end oil spray port; The diameter of the first iron core segment is smaller than the diameter of the second iron core segment, and the diameter of the second iron core segment is smaller than the diameter of the third iron core segment.

2. The stator core according to claim 1, characterized in that, The internal cooling channel extends along the axial direction of the stator core and is located close to the outer wall of the third core segment.

3. The stator core according to claim 1, characterized in that, The first core segment includes at least one first lamination, the second core segment includes at least one second lamination, and the third core segment includes a plurality of third laminations stacked sequentially between the first lamination and the second lamination; The diameter of the first lamination is smaller than the diameter of the second lamination, and the diameter of the second lamination is smaller than the diameter of the third lamination.

4. The stator core according to any one of claims 1-3, characterized in that, The number of internal cooling channels is multiple, and they are arranged at intervals along the circumference of the second iron core segment; The oil inlet chamber includes an annular cavity formed on the circumferential outer wall of the first iron core section; The multiple internal cooling channels are respectively connected to the annular cavity.

5. The stator core according to claim 4, characterized in that, The end oil spray ports are multiple and are arranged circumferentially along the end face of the second iron core segment. Each internal cooling channel is connected to at least one end oil spray port.

6. The stator core according to claim 5, characterized in that, The second core segment includes a plurality of second laminations stacked alternately in the axial direction of the stator core. Each second lamination has a plurality of end oil injection ports evenly arranged in the circumference of the second lamination. The radial distance from the center of the plurality of end oil injection ports to the axis of the second lamination decreases in sequence to form an oil injection channel extending toward the axis of the second core segment.

7. The stator core according to claim 6, characterized in that, The plurality of end fuel injectors are divided into a plurality of fuel injector groups arranged circumferentially, and each fuel injector group includes at least two end fuel injectors of different shapes.

8. The stator core according to claim 7, characterized in that, The end injection port includes at least two of the following: a Z-shaped hole, a cross-shaped hole, and a long strip hole.

9. The stator core according to claim 1, characterized in that, The outer circumferential surface of the third core segment has an installation structure for fixed connection with the shell.

10. The stator core according to claim 9, characterized in that, The mounting structure includes a first interference fit for mating with the housing; or... The mounting structure includes a first mating key or a first mating groove key; or... The mounting structure includes an ear mount with mounting holes.

11. An electric motor, characterized in that, Includes the stator core according to any one of claims 1-10.

12. A vehicle, characterized in that, Includes the motor as described in claim 11.

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