Stator core cooling structure and motor

Abstract

The invention provides a stator iron core cooling structure and a motor, the stator iron core cooling structure comprises a shell and an iron core group, the shell is provided with an oil inlet hole, the iron core group comprises a first iron core, a second iron core and a third iron core, and the edge of the first iron core and the edge of the second iron core are provided with a plurality of oil through holes. The outer diameter size of the third iron core is smaller than the outer diameter size of the first iron core and the outer diameter size of the second iron core, the arrangement position of the third iron core corresponds to the oil inlet hole, the first iron core and the second iron core are sequentially and alternately stacked at the two ends of the third iron core, and the oil through holes of the adjacent first iron core and the oil through holes of the second iron core are arranged in a staggered mode. According to the stator iron core cooling structure, rapid circulation of cooling oil is achieved through reasonable structural design and a stacking mode, the cooling oil firstly passes through the annular oil channel and then flows to the three directions of the iron core set, the stator winding can be cooled, the heat exchange efficiency is high, cooling is efficient, the overall structure is simple, and cost is low. And the design requirements of high efficiency and conciseness of iron core cooling are met.

Description

Technical Field

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

[0002] As the speed and power of the drive motors of new energy vehicles increase, the demand for cooling is also increasing, and the cooling system of the electric drive system is gradually moving towards oil cooling. In order to more efficiently utilize the cooling effect of the cooling oil on the motor system, the demand for the oil circuit design of the motor stator core is also increasing. The efficient core cooling structure can achieve efficient cooling of the stator while saving the number of parts related to motor cooling and the complexity of the design. Therefore, the efficient and simple core design has become the development direction pursued by oil-cooled motors.

[0003] Due to the structural design of the cooling oil circuit of the existing motor stator core, the cooling oil cannot fully penetrate the stator end windings and the inner diameter of the stator core. This requires the addition of multiple oil sprinkler rings. In order to adapt to these oil sprinkler rings, the overall structure needs to be significantly adjusted. This not only increases the number of overall parts, but also increases the complexity of the overall structural design, and cannot meet the efficient and simple design requirements of core cooling.

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

[0005] In view of this, in order to overcome the defects of the prior art, the present invention provides a stator core cooling structure and an electric motor, which effectively solves the problem that the cooling oil circuit of the stator core of the existing motor, due to structural design, has a large number of overall parts and a complex design, and cannot meet the efficient and simple design requirements of the core cooling.

[0006] According to a first aspect of the present invention, a stator core cooling structure is provided, wherein the stator core cooling structure comprises a shell and a core group stacked inside the shell, the shell is provided with an oil inlet hole, the core group comprises a first core, a second core, and a third core, a plurality of oil holes are provided 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 setting position of the third core corresponds to the oil inlet hole, the first core and the second core are alternately stacked at two ends of the third core in sequence, and the oil holes of the adjacent first cores and the oil holes of the second cores are alternately arranged.

[0007] Preferably, the plurality of oil holes are evenly arranged at the edge of the first core and the edge of the second core; when the first core and the second core are stacked, the oil hole of one of the first core is partially connected with the oil hole of an adjacent one of the second core.

[0008] Preferably, the number of the first cores and the number of the second cores are both multiple, and the multiple first cores and the multiple second cores are alternately stacked at the two ends of the third core.

[0009] Preferably, when the first core, the second core and the third core are stacked in sequence, the oil through hole of the first core and the oil through hole of the second core are both located outside the outer circumference of the third core.

[0010] Preferably, the first core, the second core and the third core are all formed into an annular structure; the outer periphery of the first core, the outer periphery of the second core and the outer periphery of the third core are all provided with welding structures, the welding structure of the first core and the welding structure of the second core are recessed from the outer ring of the annular structure toward the inner ring, and the welding structure of the third core protrudes radially outward from the outer ring of the annular structure.

[0011] Preferably, the welding structure of the first iron core and the welding structure of the second iron core both include welds and oil grooves, the oil groove of the first iron core is arranged on one side of the weld in a clockwise direction, and the oil groove of the second iron core is arranged on one side of the weld in a counterclockwise direction; when the first iron core and the second iron core are stacked, the welds of the first iron core and the welds of the second iron core are aligned to form a weld bead column, 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 column.

[0012] Preferably, the welding structure of the third core includes weld beads; when the first core, the second core and the third core are stacked to form the core group, the weld beads of the first core, the weld beads of the second core and the weld beads of the third core are arranged in a row along the axial direction of the core group.

[0013] Preferably, the number of the welding structures of the first core, the second core and the third core is multiple, and the multiple welding structures are evenly arranged on the outer periphery of the first core, the outer periphery of the second core and the outer periphery of the third core.

[0014] Preferably, oil ring bodies are provided at both ends of the core group in the axial direction.

[0015] According to a second aspect of the present invention, 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 invention, by arranging the core group inside the shell, the reasonable structural design and stacking method of the first core, the second core and the third core of the core group are utilized to realize the rapid circulation of cooling oil, and the cooling oil can first pass through the annular oil channel and then fully flow to the circumferential, axial and radial directions of the core group, and can cool the stator windings at both ends of the core group, with high heat exchange efficiency, and can achieve efficient cooling. At the same time, the core group does not need to be additionally provided with multiple oil spray rings, which can reduce the number of parts, simplify the overall structure, and meet the efficient and simple design requirements of core cooling.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a stator core cooling structure according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic structural diagram of a core group according to an embodiment of the present invention is shown;

[0021] Figure 3 The embodiment according to the present invention is shown Figure 2 An enlarged schematic diagram of the structure at A;

[0022] Figure 4 A schematic structural diagram of a first core according to an embodiment of the present invention is shown;

[0023] Figure 5 A schematic structural diagram of a second core according to an embodiment of the present invention is shown;

[0024] Figure 6 A schematic structural diagram of a third core according to an embodiment of the present invention is shown;

[0025] Figure 7 A front view showing a first core and a second core stack according to an embodiment of the present invention;

[0026] Figure 8 The embodiment according to the present invention is shown Figure 7 An enlarged schematic diagram of the structure at B;

[0027] Fig. 9 An isometric view of a first core and a second core stack according to an embodiment of the present invention is shown.

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

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the 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 making 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", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the 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 are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

[0034] In the following description, reference will be made to Figures 1 to 9 The detailed structures of the housing 4 and the core group of the stator core cooling structure are described in detail.

[0035] like Figures 1 to 9 As shown, in the embodiment, the housing 4 is provided with an oil inlet hole 401, the core group includes a first core 1, a second core 2, and a third core 3, and a plurality of oil holes are provided at the edge of the first core 1 and the edge of the second core 2. Figure 4 In the embodiment, the oil through hole of the first core 1 is the first oil through hole 101. Figure 5 , the oil through hole of the second core 2 is the second oil through hole 201. The outer diameter of the third core 3 is smaller than the outer diameter of the first core 1 and the outer diameter of the second core 2. The setting position of the third core 3 corresponds to the oil inlet hole 401. The outer diameter of the third core 3 is smaller and corresponds to the oil inlet hole 401 of the shell 4. In this way, an annular oil passage 402 can be formed between the outer periphery of the third core 3 and the inner wall of the shell 4. When the cooling oil enters the interior of the shell 4 from the oil inlet hole 401, it can flow along the outer periphery of the third core 3.

[0036] The first iron core 1 and the second iron core 2 are alternately stacked at two ends of the third iron core 3. Figure 1 , Figures 7 to 9 As shown, the first core 1 and the second core 2 are alternately stacked at both ends of the third core 3 to form a core group. The adjacent first cores 1 and the second cores 2 are not completely overlapped, but partially overlapped, that is, the oil holes of the adjacent first cores 1 and the oil holes of the second cores 2 are alternately arranged. Figures 7 to 9 As shown, the inner rings of the first core 1 and the second core 2 are also provided with core slots. When stacked, the core slots of the first core 1 overlap and align with the core slots of the second core 2, but the first oil hole 101 of the first core 1 partially overlaps with the second oil hole 201 of the second core 2 (as shown in FIG. Figure 8As shown), the cooling oil can only pass through the overlapping portion of the first oil hole 101 and the second oil hole 201, so that a labyrinth oil path can be formed inside the stacked core group, thereby increasing the heat exchange effect between the internal oil of the core group and the core.

[0037] The stator core cooling structure arranges the core group inside the shell 4, and utilizes the reasonable structural design and stacking method of the first core 1, the second core 2 and the third core 3 of the core group to achieve rapid circulation of cooling oil, and can make the cooling oil flow to the two ends of the core group, with high heat exchange efficiency, and can achieve efficient cooling. At the same time, the core group does not need to be additionally provided with multiple oil spray rings, which can reduce the number of parts, simplify the overall structure, and meet the efficient and concise design requirements of core cooling.

[0038] Preferably, if Figure 8 As shown, in the embodiment, two adjacent second oil holes 201 can be connected through a first oil hole 101 to achieve rapid passage of cooling oil. In addition, the three oil holes can be connected in the axial direction, so that the cooling oil can flow axially from the starting position (annular oil channel 402) to the two ends of the core group.

[0039] Preferably, if Figure 4 , Figure 5 and Figure 8 As shown, in the embodiment, a plurality of oil holes are evenly arranged at the edge of the first core 1 and the edge of the second core 2. The number of the oil holes is multiple, and they are evenly arranged at the edge of the core, so that the cooling oil can fully and comprehensively cool the core. When the first core 1 and the second core 2 are stacked, the oil hole of a first core 1 is partially connected with the oil hole of an adjacent second core 2. Such an arrangement can form a labyrinth oil circuit to increase the heat exchange effect between the internal oil of the core group and the core. The size of the connecting part of a first oil hole 101 and the second oil hole 201 can be adjusted according to the stacking angle of the core, so as to control the flow rate and flow direction of the cooling oil in the axial oil channel.

[0040] It should also be noted that the size and thickness of the first core 1, the second core 2, and the third core 3 can be specifically selected according to the model and size of the housing 4 and the motor, and are not limited here. The only limitation is that the outer diameter of the third core 3 is smaller than the outer diameter of the first core 1 and the outer diameter of the second core 2.

[0041] Preferably, if Figure 1 and Figure 2As shown, in the embodiment, the number of the first core 1 and the second core 2 are both multiple, and the multiple first cores 1 and the multiple second cores 2 are alternately stacked at the two ends of the third core 3 in sequence. Since the axial length of the shell 4 is relatively long, multiple first cores 1 and second cores 2 are required. Since the third core 3 corresponds to the oil inlet hole 401 of the shell 4, only one third core 3 can be set in the embodiment. According to the position of the oil inlet hole 401 on the shell 4, the number of cores set at both ends of the third core 3 can be selected. For example, in the embodiment, four and five cores are respectively set at both ends of the third core 3, wherein the four cores are two first cores 1 and two second cores 2, and the five cores are two first cores 1 and three second cores 2. However, it is not limited to this, and the number of appropriate cores can be selected according to the length of the shell 4, and the oil passages of the cores can be staggered, which is not limited here.

[0042] Preferably, if Figure 2 and Figure 3 As shown, in the embodiment, when the first core 1, the second core 2 and the third core 3 are stacked in sequence, the oil holes of the first core 1 and the oil holes of the second core 2 are both located outside the outer circumference of the third core 3. In this way, the cooling oil first contacts the annular oil passage 402, and then flows to the two ends of the core group through the oil holes of the first core 1 and the oil holes of the second core 2.

[0043] Preferably, if Figures 1 to 6 As shown, in the embodiment, the first core 1, the second core 2 and the third core 3 are all formed into an annular structure to meet the assembly requirements of the motor stator. Furthermore, in order to realize the assembly of multiple cores, welding structures are provided on 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. The welding structure of the first core 1 and the welding structure of the second core 2 are recessed from the outer ring of the annular structure toward the inner ring, and the welding structure of the third core 3 protrudes radially outward from the outer ring of the annular structure. Since the outer diameter of the third core 3 is relatively small, in order to adapt to the welding structure of the first core 1 and the welding structure of the second core 2, the setting direction of the welding structure of the third core 3 is opposite to the setting direction of the welding structures of the two.

[0044] Preferably, if Figures 1 to 6 As shown, in the embodiment, the welding structure of the first core 1 and the welding structure of the second core 2 both include a weld 501 and an oil groove 502, and the oil groove 502 of the first core 1 is arranged on one side of the weld 501 along the clockwise direction (the clockwise direction here may refer to Figure 4 The oil groove 502 of the second core 2 is arranged on one side of the weld bead 501 along the counterclockwise direction (the clockwise direction here may refer to Figure 5In the case where the first core 1 and the second core 2 are stacked, the weld bead 501 of the first core 1 and the weld bead 501 of the second core 2 are aligned to form a weld bead row (such as Figure 1 and Figure 2 As shown in FIG. 1 , the oil groove 502 of the first core 1 and the oil groove 502 of the second core 2 are respectively arranged on both sides of the weld bead row. Figure 8 As shown, when the first core 1 and the second core 2 are stacked, the welds 501 are aligned and the oil grooves 502 are staggered. The oil grooves 502 can facilitate welding between the cores and can also be used for the flow of cooling oil to meet the design requirements of forming the above-mentioned labyrinth oil circuit.

[0045] Preferably, if Figures 1 to 3 and Figure 6 As shown, in the embodiment, the welding structure of the third core 3 includes a weld bead 501. Since the outer periphery of the third core 3 and the housing 4 form an annular oil passage 402, there is no need to additionally provide an oil groove 502 and an oil through hole, and only the weld bead 501 is required. When the first core 1, the second core 2, and the third core 3 are stacked to form a core group, the weld bead 501 of the first core 1, the weld bead 501 of the second core 2, and the weld bead 501 of the third core 3 are arranged in a row along the axial direction of the core group for easy welding.

[0046] Preferably, if Figures 1 to 9 As shown, in the embodiment, the number of the welding structures of the first core 1, the second core 2, and the third core 3 is multiple, and the multiple welding structures are evenly arranged on 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 the welding structures of the first core 1, the second core 2, and the third core 3 is set to multiple.

[0047] Preferably, if Figure 1 As shown, in the embodiment, both ends of the core group in the axial direction are provided with an oil ring body 6. The cooling oil enters the annular oil passage 402 from the oil inlet hole 401 of the housing 4, fills the circumference of the core group, and flows axially to the two ends of the core group through the multiple oil holes of the core group to achieve cooling of the core group, and finally achieves cooling of the ends of the stator winding 8 through the oil ring bodies 6 at both ends of the core group.

[0048] The cooling process of the stator core cooling structure is as follows: the cooling oil is Figure 1After being cooled in the heat exchanger 7 in the core, the oil enters the annular oil passage 402 of the core group through the oil inlet hole 401 on the shell 4, and fills the circumference of the core group along the annular oil passage 402, and flows axially to the two ends of the core group through a plurality of staggered oil holes of the core group to achieve cooling of the core group, and finally the end of the stator winding 8 is cooled through the oil ring body 6 at both ends of the core group to meet the dual cooling of the core group and the stator winding 8.

[0049] The stator core cooling structure arranges the core group inside the shell, utilizes the reasonable structural design and stacking method of the first core, the second core and the third core of the core group to realize the rapid circulation of cooling oil, and enables the cooling oil to first pass through the annular oil channel and then fully flow to the circumferential, axial and radial directions of the core group, and can cool the stator windings at both ends of the core group, with high heat exchange efficiency, and can realize efficient cooling. At the same time, the core group does not need to be additionally provided with multiple oil spray rings, which can reduce the number of parts, simplify the overall structure, and meet the efficient and concise design requirements of core cooling.

[0050] In addition, according to a second aspect of the present invention, there is provided an electric motor, the electric motor comprising the stator core cooling structure as described above. During use, the electric motor can be cooled quickly due to the provision of the stator core cooling structure, and the number of overall parts is small, the cost is reduced, and the motor is easy to assemble.

[0051] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall 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 shell and a core group stacked inside the shell, the shell is provided with an oil inlet hole, the core group includes a first core, a second core, and a third core, a plurality of oil holes are provided 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 setting position of the third core corresponds to the oil inlet hole, the first core and the second core are alternately stacked at two ends of the third core in sequence, and the adjacent oil holes of the first core and the oil holes of the second core are staggered.

2. The stator core cooling structure according to claim 1, characterized in that: A plurality of the oil holes are evenly arranged at the edge of the first iron core and the edge of the second iron core; When the first core and the second core are stacked, the oil through hole of one of the first cores partially penetrates the oil through hole of an adjacent one of the second cores.

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

4. The stator core cooling structure according to claim 1, characterized in that: When the first core, the second core, and the third core are stacked in sequence, the oil through hole of the first core and the oil through hole of the second core are both located outside the outer circumference of the third core.

5. The stator core cooling structure according to claim 3, characterized in that: The first core, the second core and the third 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 structure of the first iron core and the welding structure of the second iron core are recessed from the outer ring of the annular structure toward the inner ring, and the welding structure of the third iron core protrudes radially outward from the outer ring of the annular structure.

6. The stator core cooling structure according to claim 5, characterized in that: The welding structure of the first iron core and the welding structure of the second iron core both include a weld bead and an oil groove, the oil groove of the first iron core is arranged on one side of the weld bead along a clockwise direction, and the oil groove of the second iron core is arranged on one side of the weld bead along a counterclockwise direction; When the first core and the second core are stacked, the weld beads of the first core and the weld beads of the second core are aligned to form a weld bead column, and the oil grooves of the first core and the oil grooves of the second core are respectively arranged on both sides of the weld bead column.

7. The stator core cooling structure according to claim 6, characterized in that: The welding structure of the third core includes a weld bead; When the first core, the second core, and the third core are stacked to form the core group, the weld beads of the first core, the weld beads of the second core, and the weld beads of the third core are arranged in a row along the axial direction of the core group.

8. The stator core cooling structure according to claim 5, characterized in that: The number of the welding structures of the first core, the second core and the third core is multiple, and the multiple welding structures are evenly arranged on the outer periphery of the first core, the outer periphery of the second core and the outer periphery of the third core.

9. The stator core cooling structure according to claim 1, characterized in that: The core group is provided with oil ring bodies at both ends in the axial direction.

10. An electric motor, characterized in that: The electric motor comprises the stator core cooling structure according to any one of claims 1 to 9.

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