Stator core cooling structure and motor

Abstract

The application provides a stator core cooling structure and a motor. The stator core cooling structure comprises a shell and a core group. The shell is provided with an oil inlet hole. The core group comprises a first core, a second core and a third core. Multiple oil through holes are arranged at the edge of the first core and the edge of the second core. The outer diameter of the third core is smaller than the outer diameter of the first core and the outer diameter of the second core. The third core is arranged at the position corresponding to the oil inlet hole. The first core and the second core are alternately stacked at the two ends of the third core. The oil through holes of the adjacent first cores and the oil through holes of the second cores are staggered. The stator core cooling structure realizes the rapid circulation of the cooling oil through the reasonable structure design and the stacking mode. The cooling oil flows through the annular oil channel and then flows to the three directions of the core group. The stator winding can be cooled. The heat exchange efficiency is high. The cooling is efficient. The overall structure is simple. The design requirements of the efficient and simple core cooling are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric motor, in particular to a stator core cooling structure and electric motor. BACKGROUND

[0002] With the increasing of the speed and power of the driving motor of new energy vehicles, the demand for cooling is also increasing, and the cooling system of the electric drive system gradually turns to oil cooling. In order to more efficiently utilize the cooling effect of the cooling oil on the motor system, the oil passage design requirement of the motor stator core is increasing. An efficient core cooling structure can realize efficient cooling of the stator, and also save the number of motor cooling related parts and the complexity of design, so the efficient and simple core design has become the development direction pursued by oil-cooled motors.

[0003] The existing cooling oil passage of the motor stator core causes the cooling oil to be unable to fully infiltrate the stator end winding due to the structural design, and the inner diameter of the stator core cannot be fully infiltrated, which requires the additional addition of multiple oil shower rings. In order to adapt to these oil shower rings, the overall structure needs to be greatly adjusted, which not only increases the overall number of parts, but also increases the complexity of the overall structure design, and cannot meet the efficient and simple design requirements of the core cooling.

[0004] Therefore, it is necessary to design a stator core cooling structure to solve the above problems. SUMMARY

[0005] Therefore, in order to overcome the defects of the prior art, the present application provides a stator core cooling structure and electric motor, which effectively solves the problem that the existing motor stator core cooling oil passage causes the overall number of parts to be large and the design to be complex due to the structural design, and cannot meet the efficient and simple design requirements of the core cooling.

[0006] According to the first aspect of the present application, a stator core cooling structure is provided, wherein the stator core cooling structure comprises a shell and a core stack stacked inside the shell, the shell is provided with an oil inlet hole, the core stack comprises a first core, a second core and a third core, a plurality of oil passages are provided at the edge of the first core and the edge of the second core, the outer diameter size of the third core is smaller than the outer diameter size of the first core and the outer diameter size of the second core, the third core is arranged at the position corresponding to the oil inlet hole, the first core and the second core are alternately stacked at both ends of the third core, and the oil passages of the adjacent first cores and the oil passages of the second cores are staggered.

[0007] Preferably, a plurality of said oil holes are uniformly arranged at the edge of said first core and the edge of said second core; in the case of stacking said first core and said second core, the oil hole of one said first core is partially penetrated with the oil hole of an adjacent said second core.

[0008] Preferably, the number of said first core and said second core is a plurality, and a plurality of said first core and a plurality of said second core are alternately stacked at two ends of said third core.

[0009] Preferably, in the case of stacking said first core, said second core and said third core in sequence, the oil hole of said first core and the oil hole of said second core are both located outside the outer peripheral edge of said third core.

[0010] Preferably, said first core, said second core and said third core are all formed into a ring structure; the outer peripheral edge of said first core, the outer peripheral edge of said second core and the outer peripheral edge of said third core are all provided with a welding structure, the welding structure of said first core and the welding structure of said second core are recessed from the outer ring to the inner ring of said ring structure, and the welding structure of said third core is protruded radially outward from the outer ring of said ring structure.

[0011] Preferably, the welding structure of said first core and the welding structure of said second core both include a welding bead and an oil groove, the oil groove of said first core is arranged on one side of said welding bead in a clockwise direction, and the oil groove of said second core is arranged on one side of said welding bead in a counterclockwise direction; in the case of stacking said first core and said second core, the welding bead of said first core and the welding bead of said second core are aligned to form a welding bead row, and the oil groove of said first core and the oil groove of said second core are arranged on both sides of said welding bead row, respectively.

[0012] Preferably, the welding structure of said third core includes a welding bead; in the case of stacking said first core, said second core and said third core to form said core group, the welding bead of said first core, the welding bead of said second core and the welding bead of said third core are arranged in a row along the axial direction of said core group.

[0013] Preferably, the number of said welding structure of said first core, said welding structure of said second core and said welding structure of said third core is a plurality, and a plurality of said welding structures are uniformly arranged at the outer peripheral edge of said first core, the outer peripheral edge of said second core and the outer peripheral edge of said third core.

[0014] Preferably, the core group is provided with an oil ring body at both ends in the axial direction.

[0015] According to a second aspect of the present application, there is provided an electric motor, wherein the electric motor comprises the stator core cooling structure as described above.

[0016] According to the stator core cooling structure of the present application, by arranging the core group inside the housing, the rapid flow of the cooling oil is achieved by the reasonable structural design and stacking mode of the first core, the second core and the third core of the core group, the cooling oil can flow to the circumferential direction, the axial direction and the radial direction of the core group through the annular oil channel, and the stator windings at both ends of the core group can be cooled, the heat exchange efficiency is high, efficient cooling can be achieved, and the core group does not need to be additionally provided with multiple oil shower rings, the number of parts can be reduced, the overall structure is simplified, and the design requirements of high efficiency and simplicity of the core cooling are met.

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 Fig. 1 shows a structural schematic diagram of a stator core cooling structure according to an embodiment of the present application;

[0020] Figure 2 Fig. 2 shows a structural schematic diagram of a core group according to an embodiment of the present application;

[0021] Figure 3 Fig. 3 shows an enlarged schematic diagram of the structure at A of Fig. 1 according to an embodiment of the present application; Figure 2

[0022] Figure 4 Fig. 4 shows a structural schematic diagram of a first core according to an embodiment of the present application;

[0023] Figure 5 Fig. 5 shows a structural schematic diagram of a second core according to an embodiment of the present application;

[0024] Figure 6 Fig. 6 shows a structural schematic diagram of a third core according to an embodiment of the present application;

[0025] Figure 7 Fig. 7 shows a front view of the stacking of the first core and the second core according to an embodiment of the present application;

[0026] ​Figure 8 An enlarged schematic view of the structure at B of FIG. 1 showing an embodiment according to the present application. Figure 7 An enlarged schematic view of the structure at B of FIG. 1 showing an embodiment according to the present application.

[0027] Figure 9 An isometric view showing a first core and a second core stack according to an embodiment of the present application.

[0028] Reference numerals: 1 - first core; 101 - first oil passage; 2 - second core; 201 - second oil passage; 3 - third core; 4 - housing; 401 - oil inlet hole; 402 - annular oil passage; 501 - weld; 502 - oil groove; 6 - oil ring body; 7 - cold heat exchanger; 8 - stator winding. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0030] In the description of the embodiments of the present application, it should be noted that the terms “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first”, “second”, “third” and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms “horizontal”, “vertical” and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, “horizontal” only means that it is more horizontal relative to “vertical”, and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] According to a first aspect of the present invention, a stator core cooling structure is provided, such as... Figures 1 to 9 As shown, the stator core cooling structure is used for the electric motor of the electric drive system. The stator core cooling structure includes a housing 4 and a core assembly.

[0034] In the following description, reference will be made to Figures 1 to 9 This section describes the detailed structure of the housing 4 and the core assembly of the stator core cooling structure.

[0035] like Figures 1 to 9 As shown, in this embodiment, the housing 4 has an oil inlet 401, and the core assembly includes a first core 1, a second core 2, and a third core 3. Multiple oil passages are provided at the edges of the first core 1 and the edges of the second core 2. For ease of description, in... Figure 4 In the middle, the oil passage hole of the first iron core 1 is the first oil passage hole 101, in Figure 5 In this structure, the oil passage of the second iron core 2 is the second oil passage 201. The outer diameter of the third iron core 3 is smaller than that of the first iron core 1 and the second iron core 2. The third iron core 3 is positioned to correspond to the oil inlet 401. The smaller outer diameter of the third iron core 3 corresponds to the oil inlet 401 of the housing 4, thus forming an annular oil channel 402 between the outer periphery of the third iron core 3 and the inner wall of the housing 4. When the cooling oil enters the interior of the housing 4 from the oil inlet 401, it can flow along the outer periphery of the third iron core 3.

[0036] The first iron core 1 and the second iron core 2 are stacked alternately at both ends of the third iron core 3, as follows: Figure 1 , Figures 7 to 9 As shown, the first iron core 1 and the second iron core 2 are alternately stacked at both ends of the third iron core 3 to form an iron core assembly. Adjacent first iron cores 1 and second iron cores 2 are not completely overlapped, but partially overlapped; that is, the oil passages of adjacent first iron cores 1 and second iron cores 2 are staggered. Figures 7 to 9 As shown, the inner rings of the first iron core 1 and the second iron core 2 are also provided with iron core slots. When stacked, the iron core slots of the first iron core 1 and the iron core slots of the second iron core 2 overlap and align. However, the first oil passage 101 of the first iron core 1 and the second oil passage 201 of the second iron core 2 partially overlap (e.g., Figure 8As shown in the diagram, the cooling oil can only pass through the overlapping part of the first oil passage 101 and the second oil passage 201, thus forming a labyrinthine oil passage inside the stacked iron core assembly, increasing the heat exchange effect between the oil inside the iron core assembly and the iron core.

[0037] This stator core cooling structure sets the core assembly inside the housing 4. The reasonable structural design and stacking of the first core 1, second core 2 and third core 3 of the core assembly enable rapid flow of cooling oil, allowing the cooling oil to flow to both ends of the core assembly. This results in high heat exchange efficiency and efficient cooling. At the same time, the core assembly does not require additional oil-drenching rings, reducing the number of parts, simplifying the overall structure, and meeting the design requirements of efficient and simple core cooling.

[0038] Preferably, such as Figure 8 As shown, in the embodiment, two adjacent second oil passages 201 can be connected through a first oil passage 101 to enable the rapid passage of cooling oil. In addition, these three oil passages can be connected axially, so that the cooling oil can travel axially from the starting position (annular oil passage 402) to both ends of the core assembly.

[0039] Preferably, such as Figure 4 , Figure 5 and Figure 8 As shown, in this embodiment, multiple oil passages are evenly distributed along the edges of the first core 1 and the second core 2. The number of oil passages is multiple and they are evenly distributed along the edges of the cores to ensure that the cooling oil can fully and comprehensively cool the cores. When the first core 1 and the second core 2 are stacked, an oil passage in one first core 1 partially communicates with an adjacent oil passage in one second core 2. This arrangement forms a labyrinthine oil passage to increase the heat exchange effect between the internal oil and the cores of the core assembly. The size of the portion of the first oil passage 101 communicating with the second oil passage 201 can be adjusted according to the stacking angle of the cores, thereby controlling the flow rate and direction of the axial oil passage cooling oil.

[0040] Furthermore, it should be noted that the dimensions and thicknesses of the first iron core 1, the second iron core 2, and the third iron core 3 can be specifically selected based on the housing 4 and the model and size of the motor, etc. There are no restrictions here. The only restriction is that the outer diameter of the third iron core 3 is smaller than the outer diameter of the first iron core 1 and the outer diameter of the second iron core 2.

[0041] Preferably, such as Figure 1 and Figure 2As shown, in this embodiment, there are multiple first iron cores 1 and multiple second iron cores 2, which are alternately stacked at both ends of the third iron core 3. Since the axial length of the housing 4 is relatively long, multiple first iron cores 1 and multiple second iron cores 2 are required. Since the third iron core 3 corresponds to the oil inlet 401 of the housing 4, only one third iron core 3 can be provided in this embodiment. The number of iron cores at both ends of the third iron core 3 can be selected based on the position of the oil inlet 401 on the housing 4. For example, in this embodiment, four and five iron cores are provided at both ends of the third iron core 3, respectively. The four iron cores consist of two first iron cores 1 and two second iron cores 2, and the five iron cores consist of two first iron cores 1 and three second iron cores 2. However, this is not a limitation; an appropriate number of iron cores can be selected based on the length of the housing 4, and the oil passages of the iron cores can be staggered. No restrictions are imposed here.

[0042] Preferably, such as Figure 2 and Figure 3 As shown in the embodiment, when the first iron core 1, the second iron core 2, and the third iron core 3 are stacked sequentially, the oil passages of the first iron core 1 and the second iron core 2 are both located outside the outer periphery of the third iron core 3. Thus, the cooling oil first contacts the annular oil channel 402, and then flows through the oil passages of the first iron core 1 and the second iron core 2 to both ends of the iron core assembly.

[0043] Preferably, such as Figures 1 to 6 As shown, in this embodiment, the first iron core 1, the second iron core 2, and the third iron core 3 are all formed into annular structures to meet the assembly requirements of the motor stator. Furthermore, to facilitate the assembly of multiple iron cores, welding structures are provided along the outer periphery of the first iron core 1, the second iron core 2, and the third iron core 3. The welding structures of the first iron core 1 and the second iron core 2 are recessed from the outer ring towards the inner ring of the annular structure, while the welding structure of the third iron core 3 protrudes radially outward from the outer ring of the annular structure. Because the outer diameter of the third iron core 3 is smaller, its welding structure is positioned in the opposite direction to the welding structures of the first iron core 1 and the second iron core 2 to accommodate them.

[0044] Preferably, such as Figures 1 to 6 As shown in the embodiment, the welding structure of the first iron core 1 and the welding structure of the second iron core 2 both include a weld bead 501 and an oil groove 502. The oil groove 502 of the first iron core 1 is arranged on one side of the weld bead 501 in a clockwise direction (here, clockwise direction can refer to...). Figure 4 In the first iron core 1, the oil groove 502 of the second iron core 2 is arranged in a counterclockwise direction on one side of the weld bead 501 (clockwise direction here can refer to...). Figure 5In the embodiment, the welding structure of the second core 2 is arranged along the outer periphery of the second core 2 in the clockwise direction (i.e., along the outer periphery of the second core 2 in the clockwise direction). In this way, the welding structure of the first core 1 and the welding structure of the second core 2 are arranged in opposite directions, i.e., left and right. In the case of stacking the first core 1 and the second core 2, the welding beads 501 of the first core 1 and the welding beads 501 of the second core 2 are aligned to form a welding bead row (as shown in Figure 1 and Figure 2 indicated), the oil grooves 502 of the first core 1 and the oil grooves 502 of the second core 2 are arranged on both sides of the welding bead row, respectively. In this way, as shown in Figure 8 indicated, when the first core 1 and the second core 2 are stacked, the welding beads 501 are aligned and the oil grooves 502 are staggered. The oil grooves 502 can facilitate welding between the cores, and at the same time can be used for the flow of cooling oil to meet the design requirements of forming a labyrinth oil path.

[0045] Preferably, as shown in Figures 1 to 3 and Figure 6 indicated, in the embodiment, the welding structure of the third core 3 includes welding beads 501, and since the outer periphery of the third core 3 and the shell 4 form an annular oil channel 402, there is no need to additionally arrange oil grooves 502 and oil holes, and only the welding beads 501 are arranged. In the case of stacking the first core 1, the second core 2 and the third core 3 to form a core group, the welding beads 501 of the first core 1, the welding beads 501 of the second core 2 and the welding beads 501 of the third core 3 are arranged in a row along the axial direction of the core group, facilitating welding.

[0046] Preferably, as shown in Figures 1 to 9 indicated, in the embodiment, the number of welding structures of the first core 1, the welding structures of the second core 2 and the welding structures of the third core 3 are all multiple, and the multiple welding structures are uniformly arranged along the outer periphery of the first core 1, the outer periphery of the second core 2 and the outer periphery of the third core 3. In order to ensure the connection strength and the formation of the oil path, the number of welding structures of the first core 1, the welding structures of the second core 2 and the welding structures of the third core 3 are all multiple.

[0047] Preferably, as shown in Figure 1 indicated, in the embodiment, the core group is provided with an oil ring body 6 at both ends in the axial direction. The cooling oil enters the annular oil channel 402 from the oil inlet hole 401 of the shell 4, fills the circumferential direction of the core group, and then flows along the axial direction through the multiple oil holes of the core group to the both ends of the core group, thereby achieving cooling of the core group, and finally achieving end cooling of the stator winding 8 through the oil ring body 6 at both ends of the core group.

[0048] The cooling process of the stator core cooling structure is as follows: the cooling oil enters the annular oil channel 402 from the oil inlet hole 401 of the shell 4, fills the circumferential direction of the core group, and then flows along the axial direction through the multiple oil holes of the core group to the both ends of the core group, thereby achieving cooling of the core group, and finally achieving end cooling of the stator winding 8 through the oil ring body 6 at both ends of the core group. Figure 1After being cooled in the heat exchanger 7, the cooling oil enters the annular oil channel 402 of the core set through the oil inlet hole 401 on the shell 4, fills the circumferential direction of the core set along the annular oil channel 402, flows to the two ends of the core set in the axial direction through the plurality of staggered oil through holes of the core set, and realizes the cooling of the core set, and finally realizes the end cooling of the stator winding 8 through the oil ring body 6 at the two ends of the core set, so as to meet the double cooling of the core set and the stator winding 8.

[0049] The stator core cooling structure sets the core set in the interior of the shell, uses the reasonable structural design and stacking mode of the first core, the second core and the third core of the core set to realize the rapid circulation of the cooling oil, and enables the cooling oil to flow to the circumferential direction, the axial direction and the radial direction of the core set through the annular oil channel, and to cool the stator winding at the two ends of the core set, has high heat exchange efficiency, can realize efficient cooling, and can reduce the number of parts, simplify the overall structure, meet the design requirements of efficient and simple core cooling.

[0050] In addition, the second aspect of the present application provides an electric motor comprising the stator core cooling structure as described above. The electric motor can realize rapid cooling, has fewer parts, reduces cost and is easy to assemble during use due to the stator core cooling structure.

[0051] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, and are used to illustrate the technical solutions of the present application, but not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some of the technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A stator core cooling structure, characterized in that, The stator core cooling structure includes a housing and a core assembly stacked inside the housing. The housing has an oil inlet. The core assembly includes a first core, a second core, and a third core. Multiple oil passages are provided at the edges of the first core and the second core. The outer diameter of the third core is smaller than the outer diameters of the first core and the second core. The third core is positioned corresponding to the oil inlet. The first core and the second core are stacked alternately at both ends of the third core. The oil passages of adjacent first cores and second cores are staggered. The first iron core, the second iron core, and the third iron core are all formed into a ring structure; the outer periphery of the first iron core, the outer periphery of the second iron core, and the outer periphery of the third iron core are all provided with welding structures. The welding structures of the first iron core and the second iron core are recessed from the outer ring of the ring structure toward the inner ring, and the welding structure of the third iron core protrudes radially outward from the outer ring of the ring structure. Both the welding structure of the first iron core and the welding structure of the second iron core include weld beads and oil grooves. The oil groove of the first iron core is arranged on one side of the weld bead in a clockwise direction, and the oil groove of the second iron core is arranged on one side of the weld bead in a counterclockwise direction. When the first iron core and the second iron core are stacked, the weld beads of the first iron core and the weld beads of the second iron core are aligned to form a weld bead row, and the oil grooves of the first iron core and the oil grooves of the second iron core are respectively arranged on both sides of the weld bead row. The oil groove of the first iron core is arranged clockwise on one side of the weld, and the oil groove of the second iron core is arranged counterclockwise on one side of the weld; the welding structure of the first iron core and the welding structure of the second iron core are arranged in opposite directions, left and right, to form a labyrinth oil path design.

2. The stator core cooling structure according to claim 1, characterized in that, The plurality of oil passage holes are evenly arranged at the edges of the first iron core and the edges of the second iron core; When the first iron core and the second iron core are stacked, the oil passage hole of one of the first iron cores is partially connected to the oil passage hole of the adjacent second iron core.

3. The stator core cooling structure according to claim 2, characterized in that, There are multiple first iron cores and multiple second iron cores, and multiple first iron cores and multiple second iron cores are stacked alternately at both ends of the third iron core.

4. The stator core cooling structure according to claim 1, characterized in that, When the first iron core, the second iron core, and the third iron core are stacked in sequence, the oil passage holes of the first iron core and the second iron core are both located outside the outer periphery of the third iron core.

5. The stator core cooling structure according to claim 1, characterized in that, The welding structure of the third iron core includes weld beads; When the first iron core, the second iron core, and the third iron core are stacked to form the iron core group, the weld beads of the first iron core, the weld beads of the second iron core, and the weld beads of the third iron core are arranged in a row along the axial direction of the iron core group.

6. The stator core cooling structure according to claim 1, characterized in that, The number of welding structures for the first iron core, the second iron core, and the third iron core are all multiple, and the multiple welding structures are evenly arranged on the outer periphery of the first iron core, the outer periphery of the second iron core, and the outer periphery of the third iron core.

7. The stator core cooling structure according to claim 1, characterized in that, The core assembly has oil ring bodies at both ends in the axial direction.

8. An electric motor, characterized in that, The electric motor includes the stator core cooling structure according to any one of claims 1 to 7.

Images