Stator core, motor and vehicle

Abstract

The invention provides a stator iron core, a motor and a vehicle, and relates to the technical field of vehicles, the stator iron core comprises a stator main body, the stator main body comprises a plurality of iron core units which are sequentially stacked in the axial direction of the stator main body, and each iron core unit is internally provided with a plurality of oil holes which are sequentially distributed in the circumferential direction of the iron core unit; the two ends of each oil hole penetrate through the two axial end faces of the iron core units respectively, and the projection of each oil hole in each iron core unit in the radial plane of the stator body partially coincides with the projection of two adjacent oil holes in the adjacent iron core unit in the radial plane of the stator body in the circumferential direction. According to the invention, the oil duct structure in the casing can be relatively simplified, so that the manufacturing difficulty of the casing can be reduced; the radial size of the motor can be reduced without additionally sleeving a spraying ring; the formed oil duct can be ensured to penetrate into the stator iron core, so that the cooling effect is better; cooling oil can be forced to flow in the stator iron core in a tortuous mode, and therefore the cooling effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a stator core, an electric motor, and a vehicle. Background Technology

[0002] When an electric motor is working, its stator windings and stator core will generate heat. In order to avoid the temperature rise affecting the motor performance, an appropriate oil cooling scheme is often designed in the motor to dissipate heat from the stator windings and stator core.

[0003] In related technologies, the oil cooling solution generally involves installing spray rings at both ends of the stator core to cool the windings and the core with oil. However, the spray rings will occupy a certain amount of radial space, which will increase the radial dimension of the motor. Another solution is to directly machine oil channels in the housing to cool the windings and the core with oil. However, directly modifying the housing is usually more complex, which will increase the difficulty of manufacturing the housing. Summary of the Invention

[0004] The problem solved by this invention is: how to reduce the radial dimension of the motor and reduce the manufacturing difficulty of the motor housing while ensuring the heat dissipation effect of the stator winding and stator core.

[0005] To address the above problems, the present invention provides a stator core, a motor, and a vehicle.

[0006] In a first aspect, the present invention provides a stator core, comprising a stator body, the stator body comprising a plurality of core units stacked sequentially along its axial direction, each core unit having a plurality of oil holes distributed sequentially along its circumference, and both ends of each oil hole penetrating the axial end faces of the core unit, wherein the projection of each oil hole in the core unit onto the radial plane of the stator body partially coincides with the projection of two adjacent oil holes in adjacent core units onto the radial plane of the stator body along the circumferential direction.

[0007] Optionally, the oil hole extends in an arc shape around the axis of the core unit, and the size of the oil hole in the arc-shaped extension direction is greater than the distance between two adjacent oil holes.

[0008] Optionally, some of the oil holes extend radially outward along the corresponding core unit and penetrate the outer peripheral surface of the corresponding core unit to form an oil inlet.

[0009] Optionally, there are two oil inlets, and the two oil inlets are located in the same iron core unit.

[0010] Optionally, the stator core further includes two lamination groups respectively attached to both ends of the stator body, each lamination group having a first groove on its outer peripheral surface; each core unit having a second groove on its outer peripheral surface, and a portion of the core unit near the lamination group having a third groove on its outer peripheral surface; the second grooves of the multiple core units are aligned and connected to each other to form a first weld bead, the first weld bead having a first welding layer, the first groove and the third groove being aligned and connected to each other to form a second weld bead, the second weld bead having a second welding layer.

[0011] Optionally, the plurality of core units include a first core unit and at least two second core units; the first core unit is configured to correspond to the oil passage on the inner wall of the housing, the two oil inlets are provided on the first core unit, and the circumferential spacing between the two oil inlets is adapted to the circumferential length of the oil passage; at least two second core units are located on both sides of the first core unit to be radially offset from the oil passage, the second groove is provided on the first core unit and the second core unit, and the third groove is provided on the second core unit.

[0012] Optionally, the lamination group is provided with an oil outlet channel that communicates with the oil hole of the adjacent core unit, and the oil outlet channel gradually tilts toward the axis of the lamination group in a direction away from the stator body.

[0013] Secondly, the present invention provides an electric motor, including a housing and a stator core as described above, wherein the housing is sleeved on the stator core, and an oil inlet hole is provided in the wall of the housing, the oil inlet hole communicating with the oil inlet of the stator core.

[0014] Optionally, the inner wall of the housing is recessed with an oil passage communicating with the oil inlet hole. The oil passage extends circumferentially along the housing, and its extension length is adapted to the distance between the two oil inlets on the first core unit of the stator core. The oil inlet hole is connected to the two oil inlets respectively through the oil passage.

[0015] Thirdly, the present invention provides a vehicle including the motor described above.

[0016] The beneficial effects of the stator core of the present invention are as follows: By allowing oil holes to penetrate the axial end faces of the core unit, and ensuring that the projection of each oil hole in each core unit onto the radial plane of the stator body partially coincides with the projections of two adjacent oil holes in adjacent core units onto the radial plane of the stator body along the circumferential direction, all oil holes of multiple core units can be interconnected to form an oil channel for cooling oil flow, thereby achieving cooling of the stator winding and stator core. Furthermore, since the oil channel is mainly constructed using oil holes inside the core unit, the oil channel structure in the housing can be relatively simplified, thus reducing the manufacturing difficulty of the housing. Additionally, there is no need to additionally install a spray ring on the stator core, avoiding the spray ring's interference with the electrical circuit. The reduced radial space occupied by the motor allows for a decrease in its radial dimensions. Furthermore, connecting the oil holes within the core units to form oil channels ensures that these channels penetrate deeply into the stator core, thereby improving cooling efficiency and resulting in better cooling performance. Moreover, partially aligning the projection of each oil hole in the radial plane of the stator body with the projections of two adjacent oil holes in adjacent core units creates a staggered arrangement of oil holes between adjacent core units. This forces the cooling oil to flow more tortuously within the stator core, increasing the contact area between the oil and the core and improving the flow rate of the oil channels, thus further enhancing the cooling effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the stator core structure according to an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the stator core according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of two core units of the stator core in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of one of the core units of the stator core according to an embodiment of the present invention; Figure 5 for Figure 4 Side view of the iron core unit; Figure 6 for Figure 1 Enlarged schematic diagram of part I of the middle stator core; Figure 7 for Figure 6 Enlarged schematic diagram of part II of the middle stator core; Figure 8 for Figure 6 Enlarged schematic diagram of part III of the middle stator core; Figure 9 This is a cross-sectional view of the stator core according to an embodiment of the present invention; Figure 10 for Figure 9 Enlarged schematic diagram of part IV of the middle stator core; Figure 11 This is a schematic diagram of the structure of the motor according to an embodiment of the present invention; Figure 12 This is a cross-sectional view of the motor according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. Stator core; 11. Stator body; 111. Core unit; 1111. Oil hole; 1112. Oil inlet; 1113. Second groove; 1114. Third groove; 12. Lamination assembly; 121. Oil outlet channel; 122. Lamination; 1221. First groove; 1222. Oil outlet; 13. First weld bead; 14. Second weld bead; 20. Housing; 21. Oil inlet; 22. Oil channel. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing upward and the negative direction representing downward. The X-axis represents the horizontal direction and is designated as front and back, with the positive direction of the X-axis representing the front and the negative direction representing the back. The Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] This invention provides a stator core, a motor, and a vehicle, which will be described in detail below with reference to specific embodiments.

[0024] like Figures 1 to 3 As shown, an embodiment of the present invention provides a stator core 10, including a stator body 11. The stator body 11 includes a plurality of core units 111 stacked sequentially along its axial direction. Each core unit 111 is provided with a plurality of oil holes 1111 distributed sequentially along its circumference. The two ends of each oil hole 1111 pass through the two end faces of the core unit 111 in the axial direction. The projection of each oil hole 1111 in the radial plane of the stator body 11 and the projection of two adjacent oil holes 1111 in the radial plane of the stator body 11 in the adjacent core unit 111 partially coincide along the circumferential direction.

[0025] Specifically, refer to Figure 1 Five core units 111 can be provided, and the five core units 111 are stacked sequentially along the axial direction of the stator body 11. (Refer to...) Figure 3 Each core unit 111 may have 18 oil holes 1111, and the 18 oil holes 1111 are evenly spaced along the circumference of the core unit 111. The radial plane of the stator body 11 is a plane perpendicular to its axis. Meanwhile, referring to... Figure 3 It can be seen that in the two core units 111, the two oil holes 1111 (denoted as holes a and holes b) of one core unit 111 and the two oil holes 1111 (denoted as holes c and holes d) of the other core unit 111 have the following positional relationship: In the axial direction of the stator body 11, the portion of hole d near both ends is directly opposite to holes a and holes b, that is, the projection of hole d in the radial plane of the stator body 11 partially coincides with the projections of holes a and holes b in the radial plane of the stator body 11 along the circumferential direction; In the axial direction of the stator body 11, the portion of hole a near both ends is directly opposite to holes c and holes d, that is, the projection of hole a in the radial plane of the stator body 11 partially coincides with the projections of holes c and holes d in the radial plane of the stator body 11 along the circumferential direction.

[0026] In this embodiment, by making the oil holes 1111 penetrate the axial end faces of the core unit 111, and by ensuring that the projection of each oil hole 1111 in the radial plane of the stator body 11 of each core unit 111 partially coincides with the projection of two adjacent oil holes 1111 in the radial plane of the stator body 11 of an adjacent core unit 111 along the circumferential direction, it can be ensured that all the oil holes 1111 of the multiple core units 111 are interconnected to form an oil channel for the flow of cooling oil, thereby achieving cooling of the stator winding and stator core. Since the oil channel is mainly constructed using the oil holes 1111 inside the core unit 111, the oil channel structure in the housing can be relatively simplified, thus reducing the manufacturing difficulty of the housing. Furthermore, there is no need to additionally install a spray ring on the stator core, avoiding the spray ring from affecting the motor diameter. The space occupied by the oil holes 1111 inside the core unit 111 is reduced, thereby reducing the radial dimension of the motor. In addition, connecting the oil holes 1111 inside the core unit 111 to form an oil channel ensures that the formed oil channel penetrates deeper into the stator core, thereby improving the cooling efficiency and making the cooling effect better. Moreover, by partially coinciding the projection of each oil hole 1111 in the radial plane of the stator body 11 with the projection of two adjacent oil holes 1111 in the radial plane of the stator body 11 of the adjacent core unit 111, the oil holes 1111 of the two adjacent core units 111 are arranged in a staggered manner. This forces the cooling oil to flow more tortuously inside the stator core 10, increases the contact area between the oil and the core, and increases the oil flow rate of the oil channel, thereby further improving the cooling effect.

[0027] Optionally, such as Figure 3 As shown, the oil hole 1111 extends in an arc shape around the axis of the iron core unit 111, and the size of the oil hole 1111 in the arc-shaped extension direction is greater than the distance between two adjacent oil holes 1111.

[0028] Specifically, in each core unit 111, the multiple oil holes 1111 are evenly spaced along the circumference of the core unit 111, and the distance between two adjacent oil holes 1111 is less than the extension length of the oil hole 1111 along the circumference of the core unit 111. Figure 3 Taking holes c and d as examples, refer to Figure 3 The distance between holes c and d is less than the length of hole c or hole d extending circumferentially along the core unit 111.

[0029] In this optional embodiment, since the core unit 111 itself is a hollow structure, the thickness of the core unit 111 along its own radial direction is limited, but there is room for extension in the circumferential direction. Therefore, in this embodiment, the oil hole 1111 extends in an arc shape around the axis of the core unit 111. This can make full use of the circumferential space of the core unit 111 without increasing the radial dimension of the core unit 111. On the other hand, it can ensure that the oil hole 1111 has a large dimension in the circumferential direction of the core unit 111, so that the cooling oil has a large contact area with the core unit 111 after entering the oil hole 1111, thereby improving the cooling effect. In addition, by making the dimension of each oil hole 1111 in the extension direction larger than the distance between two adjacent oil holes 1111, it is possible to make any one oil hole 1111 of one core unit 111 of two adjacent core units 111 simultaneously connected with two adjacent oil holes 1111 of the other core unit 111, so as to ensure the staggered distribution of oil holes 1111 of two adjacent core units 111, thereby effectively ensuring that all oil holes 1111 of multiple core units 111 are interconnected.

[0030] Optionally, such as Figure 2 , Figure 4 and Figure 5 As shown, some of the oil holes 1111 extend radially outward along the corresponding iron core unit 111 and penetrate the outer peripheral surface of the corresponding iron core unit 111 to form an oil inlet 1112.

[0031] It should be noted that the oil inlet 1112 can be located on any one of the core units 111; there are no restrictions on this. Figure 2 , Figure 4 and Figure 5 For example, there are five iron core units 111, and the oil inlet 1112 is opened on one of the five iron core units 111 near the middle.

[0032] In this optional embodiment, by having an oil hole 1111 penetrate through the outer peripheral surface of the core unit 111 to form an oil inlet 1112, the cooling oil outside the stator core 10 can enter the oil hole 1111 through the oil inlet 1112, and finally the cooling oil is guided by the oil hole 1111 to all the oil holes 1111 of the multiple core units 111 to achieve cooling. In addition, since the oil inlet 1112 is formed by the oil hole 1111 penetrating through the outer peripheral surface of the core unit 111, the outline size of the oil inlet 1112 is basically equivalent to the cross-sectional size of the oil hole 1111, ensuring that the oil inlet 1112 has a sufficiently large size, thereby improving the oil supply efficiency.

[0033] Optionally, such as Figure 4 and Figure 5As shown, there are two oil inlets 1112, and the two oil inlets 1112 are located in the same iron core unit 111.

[0034] In this optional embodiment, by setting two oil inlets 1112, and having the two oil inlets 1112 in the same iron core unit 111, the cooling oil can enter the iron core unit 111 through the two oil inlets 1112 respectively, thereby achieving two oil inlets. This can improve the efficiency of oil inlet and promote the convection of oil in multiple iron core units 111, thus improving the cooling effect.

[0035] Furthermore, it is understandable that when the two oil inlets 1112 are too close together, the oil inlet positions of the stator core 10 will be concentrated, thus affecting the uniformity of the cooling oil temperature distribution in the stator core 10. This is not conducive to the uniform heat dissipation of the stator core 10. Therefore, optionally, referring to... Figure 5 The two oil inlets 1112 can be spaced 120° apart along the circumference of the core unit 111. This ensures that the two oil inlets 1112 are far apart and avoids the oil inlet positions being concentrated, thereby ensuring uniform heat dissipation of the stator core 10 and improving the cooling effect.

[0036] Optionally, such as Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the stator core 10 also includes two lamination groups 12 respectively attached to both ends of the stator body 11. Each lamination group 12 has a first groove 1221 on its outer peripheral surface. Each core unit 111 has a second groove 1113 on its outer peripheral surface, and a third groove 1114 is also provided on the outer peripheral surface of the core unit 111 near the lamination group 12. The second grooves 1113 of the multiple core units 111 are aligned and connected to each other to form a first weld bead 13. A first welding layer is provided in the first weld bead 13. The first groove 1221 and the third groove 1114 are aligned and connected to each other to form a second weld bead 14. A second welding layer is provided in the second weld bead 14.

[0037] Specifically, the outer peripheral surfaces of the core units 111 at both ends of the stator body 11 are respectively provided with third grooves 1114, such that the third groove 1114 at one end can form a second weld bead 14 with the first groove 1221 of the corresponding lamination group 12, and the third groove 1114 at the other end can also form a second weld bead 14 with the first groove 1221 of the corresponding lamination group 12, thus forming two sets of second weld beads 14. The first weld bead 13 formed can assist in welding multiple core units 111. Specifically, during welding, the welding torch can be moved along the first weld bead 13 to generate a first weld formation layer in the first weld bead 13, thereby connecting multiple core units 111 into one piece; the second weld bead 14 formed can assist in welding the core units 111 and the lamination group 12. Specifically, during welding, the welding torch can be moved along the second weld bead 14 to generate a second weld formation layer in the second weld bead 14, thereby connecting the core units 111 and the lamination group 12 into one piece.

[0038] Understandably, traditional welding between multiple core units or between core units and laminations usually relies on the same weld bead, that is, a single weld bead is formed simultaneously on the outer circumference of multiple core units and laminations. During welding, the welding torch is moved along the weld bead to weld multiple core units and laminations together synchronously. However, in this way, only a single weld can be formed by relying on the weld bead, which is not conducive to ensuring the strength of the weld. In this optional embodiment, the first weld bead 13 is formed by aligning the second grooves 1113 of multiple core units 111 together, serving as a channel for the welding torch to move during welding, so as to quickly weld multiple core units 111 together. At the same time, the second weld bead 14 is formed by aligning the first groove 1221 and the third groove 1114 together, serving as a channel for the welding torch to move during welding, so as to quickly weld the core units 111 and the lamination group 12 together. Ultimately, multiple core units 111 and lamination group 12 can be welded together. Furthermore, the first weld bead 13 and the second weld bead 14 can form different independent weld seams (weld forming layers), which relatively increases the number of weld seams and reduces the length of a single weld seam, thereby improving the welding strength of the entire stator core 10. Moreover, the greater number and longer weld seams can also ensure the accuracy of the assembly of multiple core units 111 and lamination group 12, which is beneficial to ensuring the flatness of the circumferential surface of the stator core 10.

[0039] Furthermore, multiple first weld beads 13 and multiple second weld beads 14 can be provided along the circumference of the stator core 10, and the multiple first weld beads 13 and multiple second weld beads 14 are evenly spaced along the circumference of the stator core 10, which can ensure the uniformity of circumferential welding and effectively ensure the welding strength.

[0040] Optionally, such as Figure 1 and Figure 6As shown, the plurality of iron core units 111 include a first iron core unit and at least two second iron core units; the first iron core unit is configured to correspond to the oil passage 22 on the inner wall of the housing 20, and two oil inlets 1112 are provided on the first iron core unit, and the distance between the two oil inlets 1112 in the circumferential direction is adapted to the length of the oil passage 22 in the circumferential direction; at least two second iron core units are located on both sides of the first iron core unit to be radially offset from the oil passage 22, a second groove 1113 is provided on the first iron core unit and the second iron core unit, and a third groove 1114 is provided on the second iron core unit.

[0041] The first core unit consists of one unit, while the second core unit can consist of two or more units, as detailed in the following reference. Figure 6 Of the five core units 111, the middle core unit 111 is the first core unit, and the four core units 111 on both sides are the second core units.

[0042] Combination Figure 12 The oil inlet 21 needs to be connected to the two oil inlets 1112 via the oil passage 22. Therefore, the cooling oil flowing out of the oil inlet 21 will flow circumferentially within the oil passage 22 to reach the two oil inlets 1112 respectively. The oil passage 22 is a groove-shaped structure recessed into the inner wall of the housing 20. Thus, when the cooling oil flows circumferentially within the oil passage 22, it will inevitably come into contact with the circumferential surface of the first iron core unit (the part between the two oil inlets 1112). At this time, if a third groove 1114 is also provided on the first iron core unit, for example, the third groove 111 If the oil is located between the two oil inlets 1112, the cooling oil will inevitably flow to the surface of the second weld formation layer in the third groove 1114. Since the second weld formation layer itself is formed by welding, it is difficult to guarantee the flatness of its surface with the circumferential surface of the stator body 11. Therefore, the cooling oil flowing to the surface of the second weld formation layer is likely to flow along the surface of the second weld formation layer until it flows out of the stator core from the lamination group 12, causing waste of cooling oil. This results in the cooling oil not being sprayed and cooled according to the preset path, which will affect the cooling efficiency. In this optional embodiment, by providing the third groove 1114 only on the second core unit, and the second core unit itself being radially offset from the oil passage 22, when the cooling oil flows circumferentially within the oil passage 22, it will only contact the circumferential surface of the first core unit, but not the circumferential surface of the second core unit. This prevents the cooling oil from flowing to the surface of the second weld layer of the third groove 1114, thus avoiding waste and ensuring that the cooling oil is sprayed and cooled according to a predetermined path, thereby guaranteeing cooling efficiency. Simultaneously, since both ends of the first weld bead 13 are blocked by the lamination assembly 12 (refer to...), Figure 7Therefore, even if the cooling oil flows to the surface of the first weld layer in the first weld bead 13 due to contact with the circumferential surface of the first core unit, it will not flow out and be wasted because the two ends of the first weld bead 13 are blocked, thus avoiding affecting the cooling efficiency. Therefore, the first core unit may be provided with a second groove 1113 for forming the first weld bead 13.

[0043] Optionally, such as Figure 9 and Figure 10 As shown, the lamination group 12 has an oil outlet channel 121 that communicates with the oil hole 1111 of the adjacent core unit 111. The oil outlet channel 121 gradually tilts toward the axis of the lamination group 12 in a direction away from the stator body 11.

[0044] Specifically, the lamination assembly 12 may include a plurality of laminations 122 stacked sequentially along the axial direction, and the oil outlet channel 121 may include a plurality of oil outlet holes 1222 connected sequentially. The plurality of oil outlet holes 1222 are respectively provided on the plurality of laminations 122, and in the direction away from the stator body 11, the distance between the plurality of oil outlet holes 1222 and the axis of the lamination assembly 12 gradually decreases, so that the oil outlet channel 121 gradually tilts toward the axis of the lamination assembly 12 in the direction away from the stator body 11.

[0045] In this optional embodiment, by connecting the oil outlet channel 121 with the oil hole 1111, the cooling oil in the oil hole 1111 can be sprayed out through the oil outlet channel 121 to the stator winding wound inside the stator core 10, thereby achieving the cooling effect on the stator winding. Combined with the cooling effect of the cooling oil flowing through the oil hole 1111 on the stator core 10, the stator winding and the stator core 10 are cooled synchronously. In addition, because the oil outlet channel 121 gradually tilts towards the axis of the lamination group 12 in a direction away from the stator body 11, the cooling oil in the oil hole 1111 can be sprayed out of the oil outlet channel 121 in a centripetal manner, so as to fully spray onto the stator winding and improve the cooling effect on the stator winding.

[0046] Furthermore, multiple oil outlet channels 121 can be opened on the lamination group 12, and the multiple oil outlet channels 121 are connected to the multiple oil holes 1111 of the connected iron core unit 111 one by one. This arrangement allows the cooling oil to be discharged synchronously through multiple oil outlet channels 121, which can ensure the uniformity of circumferential oil spraying and thus improve the cooling effect on the stator winding.

[0047] like Figure 11 and Figure 12 As shown, an embodiment of the present invention provides an electric motor, including a housing 20 and a stator core 10 as described above. The housing 20 is sleeved on the stator core 10, and an oil inlet hole 21 is provided on the wall of the housing 20. The oil inlet hole 21 is connected to the oil inlet 1112 of the stator core 10.

[0048] It should be noted that only the housing 20 and the stator core 10 are shown in the figure, but the motor may also include stator windings, rotor assembly, etc., which are not limited here.

[0049] In this embodiment, since the housing 20 is sleeved on the stator core 10 and the housing 20 has an oil inlet hole 21 that communicates with the oil inlet 1112, when external cooling oil enters the oil inlet hole 21, the cooling oil can enter the stator core 10 through the oil inlet 1112, thereby achieving cooling of the stator core 10 and the stator winding.

[0050] Optionally, such as Figure 11 and Figure 12 As shown, the inner wall of the housing 20 is recessed with an oil passage 22 that communicates with the oil inlet 21. The oil passage 22 extends circumferentially along the housing 20, and its extension length is adapted to the spacing between the two oil inlets 1112 on the first core unit of the stator core 10. The oil inlet 21 is connected to the two oil inlets 1112 respectively through the oil passage 22.

[0051] Specifically, the two oil inlets 1112 are 120° apart along the circumference of the core unit 111. Correspondingly, the two ends of the oil passage 22 can be 120° apart along the circumference of the housing 20. At this time, the extension length of the oil passage 22 is adapted to the distance between the two oil inlets 1112.

[0052] In this optional embodiment, by extending the oil passage 22 circumferentially along the housing 20 and adapting its extension length to the distance between the two oil inlets 1112, the oil inlet 21 is connected to the two oil inlets 1112 respectively through the oil passage 22. That is, in order to achieve the connection between the oil inlet 21 and the two oil inlets 1112 respectively, this solution designs the oil passage 22 to a length that is equivalent to the distance between the two oil inlets 1112, without designing it as a full circle structure. This can shorten the length of the oil passage 22 as much as possible while ensuring the connection between the two oil inlets 1112, thereby reducing the complexity of the oil passage structure and making the housing manufacturing more difficult.

[0053] An embodiment of the present invention provides a vehicle including the motor described above.

[0054] In this embodiment, since the vehicle includes the aforementioned motor, it possesses all the beneficial effects of all embodiments of the aforementioned motor, which will not be elaborated upon here.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A stator core, characterized in that, The stator body (11) includes a stator body (11) comprising a plurality of iron core units (111) stacked sequentially along its axial direction. Each iron core unit (111) is provided with a plurality of oil holes (1111) distributed sequentially along its circumference. The two ends of each oil hole (1111) pass through the two end faces of the iron core unit (111) in the axial direction. The projection of each oil hole (1111) in the radial plane of the stator body (11) in each iron core unit (111) partially coincides with the projection of two adjacent oil holes (1111) in the radial plane of the stator body (11) in the adjacent iron core unit (111) along the circumferential direction.

2. The stator core according to claim 1, characterized in that, The oil hole (1111) extends in an arc shape around the axis of the iron core unit (111), and the size of the oil hole (1111) in the arc-shaped extension direction is greater than the distance between two adjacent oil holes (1111).

3. The stator core according to claim 1, characterized in that, Some of the oil holes (1111) extend radially outward along the corresponding iron core unit (111) and penetrate the outer peripheral surface of the corresponding iron core unit (111) to form an oil inlet (1112).

4. The stator core according to claim 3, characterized in that, There are two oil inlets (1112), and the two oil inlets (1112) are located in the same iron core unit (111).

5. The stator core according to claim 4, characterized in that, It also includes two lamination groups (12) respectively attached to both ends of the stator body (11), each lamination group (12) having a first groove (1221) on its outer peripheral surface; each core unit (111) having a second groove (1113) on its outer peripheral surface, and a third groove (1114) on the outer peripheral surface of the core unit (111) near the lamination group (12); the second grooves (1113) of the multiple core units (111) are aligned and connected to each other to form a first weld bead (13), the first weld bead (13) having a first welding forming layer, the first groove (1221) and the third groove (1114) being aligned and connected to each other to form a second weld bead (14), the second weld bead (14) having a second welding forming layer.

6. The stator core according to claim 5, characterized in that, The plurality of iron core units (111) include a first iron core unit and at least two second iron core units; the first iron core unit is configured to correspond to the oil passage (22) on the inner wall of the housing (20), the two oil inlets (1112) are provided on the first iron core unit, and the distance between the two oil inlets (1112) in the circumferential direction is adapted to the length of the oil passage (22) in the circumferential direction; at least two second iron core units are located on both sides of the first iron core unit to be radially offset from the oil passage (22), the second groove (1113) is provided on the first iron core unit and the second iron core unit, and the third groove (1114) is provided on the second iron core unit.

7. The stator core according to claim 5, characterized in that, The lamination group (12) has an oil outlet channel (121) that is connected to the oil hole (1111) of the adjacent core unit (111). The oil outlet channel (121) gradually tilts toward the axis of the lamination group (12) in a direction away from the stator body (11).

8. An electric motor, characterized in that, Includes a housing (20) and a stator core (10) as described in any one of claims 1-7, wherein the housing (20) is sleeved on the stator core (10), and an oil inlet hole (21) is provided on the wall of the housing (20), the oil inlet hole (21) being connected to the oil inlet (1112) of the stator core (10).

9. The motor according to claim 8, characterized in that, The inner wall of the housing (20) is recessed with an oil passage (22) that communicates with the oil inlet (21). The oil passage (22) extends circumferentially along the housing (20), and its extension length is adapted to the distance between the two oil inlets (1112) on the first core unit of the stator core (10). The oil inlet (21) is connected to the two oil inlets (1112) respectively through the oil passage (22).

10. A vehicle, characterized in that, Includes the motor as described in claim 8 or 9.

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