Oil-cooled structure of stator assembly, motor and vehicle
By setting oil channels on the stator core and tilting the sides of the insulating slot paper, the creepage path length is increased, solving the problem of short creepage distance in the stator winding and improving the safety and cooling effect of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYCET TRANSMISSION TECH HEBEI CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-07-31
AI Technical Summary
In existing technologies, the creepage distance between the stator winding and the stator core is short, resulting in poor motor safety and stability.
Oil channels are provided on the stator core, and a first opening slot is made on the insulating groove paper so that the cooling oil can directly enter the stator winding. At the same time, the side of the insulating groove paper is tilted to form an acute angle with the end face of the stator winding, which increases the length of the creepage path.
It increases the creepage distance between the stator core and the stator winding, reduces the risk of leakage, enhances the safety and stability of the stator assembly, and maintains the cooling effect.
Smart Images
Figure CN224582964U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of vehicle body reinforcement technology, and more specifically, relates to an oil-cooled structure for a stator assembly, an electric motor, and a vehicle. Background Technology
[0002] A gap cavity is provided between the stator core and the rotor core. The stator core has winding slots that communicate with the gap cavity. The winding slots are used to install the stator windings. In addition, in order to achieve slot insulation between the winding conductors and the stator core, as well as interlayer insulation and phase insulation between the winding conductors, insulating slot paper is also required to cover the outside of each set of stator windings.
[0003] In the prior art, the insulating slot paper usually has openings to guide the cooling oil into the winding slots of the stator core, so that the cooling oil comes into contact with the stator winding for cooling. For example, in the patents with application numbers 202411099668.6 and 202421034499.3, the insulating slot paper has openings. However, the creepage distance between the stator winding and the stator core provided in the technical solution is small. When the creepage distance does not meet the requirements, it is easy to affect the safety performance and stability of the motor. Utility Model Content
[0004] The purpose of this application is to provide an oil-cooled structure for a stator assembly, a motor, and a vehicle, aiming to solve the technical problems of short creepage distance between the stator winding and the stator core and poor safety in the prior art.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, an oil-cooling structure for a stator assembly is provided, comprising: The stator core has a ring-shaped structure; multiple mounting slots are provided on the inner ring of the stator core, and the multiple mounting slots are spaced apart along the circumference of the stator core. Each mounting slot has a core oil passage at the bottom; the mounting slots are used to install stator windings. Multiple insulating grooves are provided, each corresponding to one of the mounting grooves; the insulating grooves are wrapped around the outer peripheral wall of the stator winding, with the two ends of the insulating grooves spaced apart, forming a first opening groove that communicates with the iron core oil passage. Wherein, the open end face of the insulating groove paper is defined as the first end face; the side of the insulating groove paper facing the stator winding is defined as the first side face; the creepage path includes a first path and a second path, the first path being parallel to the width direction of the first side face and the second path being parallel to the width direction of the first end face; the first side face is inclined to the end face of the stator winding, and the two form a first acute angle, and the creepage path between the stator core and the stator winding includes the first path and the second path.
[0006] Compared with the prior art, the solution shown in this application provides a stator core with the aforementioned core oil channels and an insulating slot with a first opening groove. This allows cooling oil to directly enter the stator winding covered by the insulating slot through the core oil channels and the first opening groove, thereby cooling the stator winding and ensuring the cooling effect. Compared with the conventional method where the first side is attached to the outer end face of the stator winding, this application tilts the first side of the first opening groove towards the outer end face of the stator winding to form the aforementioned first acute angle structure between the insulating slot and the stator winding. This increases the creepage distance between the stator core and the stator winding, i.e., increases the length of the first path, specifically increasing the width distance from the first end face to the vertex of the first acute angle. This ensures that the creepage distance meets safety requirements, reduces the risk of leakage, and improves the safety and stability of the stator assembly.
[0007] In the embodiments provided in this application, the solution can balance cooling effect and safety. That is, while ensuring that the cooling oil is smoothly introduced into the stator winding, it can effectively increase the creepage distance between the stator core and the stator winding, thereby improving the safety and reliability of the stator assembly.
[0008] In one possible implementation, the side of the insulating groove paper facing away from the outer end face of the stator winding is defined as the second side surface; the second side surface is at least partially placed within the core oil passage. The width of the portion of the second side that is located within the oil passage of the iron core is defined as the first width; the distance from the first end face to the vertex of the first acute angle is defined as the second width; the creepage distance between the stator iron core and the stator winding is the sum of the first width, the second width, and the width of the first end face.
[0009] By extending the second side into the oil passage of the iron core, the first end face is moved away from the groove wall of the mounting slot of the stator iron core, thereby increasing the creepage distance between the stator iron core and the stator winding by a first width, thereby increasing the creepage distance, further reducing the risk of leakage, and improving the safety and reliability of the stator assembly.
[0010] In some embodiments, the first end face is perpendicular to both the first side face and the second side face, and the opening size of the first opening groove formed by the two first end faces gradually increases in the direction away from the mounting groove.
[0011] By setting the first end face, the first side face, and the second side face perpendicularly, the opening of the first opening groove can be gradually enlarged, thereby forming a funnel-shaped structure to facilitate the drainage of cooling oil.
[0012] In some embodiments, the angle between each of the first end faces and the first side face is an obtuse angle, and the opening size of the first opening groove formed by the two first end faces remains unchanged.
[0013] By setting the angle between the first end face and the first side face to an obtuse angle, the distance of the first width can be further increased, thereby increasing the creepage distance between the stator core and the stator winding and improving the safety of the stator assembly.
[0014] In one possible implementation, the stator core includes: The iron core assembly has an inwardly recessed annular oil inlet groove on the outer periphery of the middle part; the iron core assembly also has two oil guide grooves symmetrically arranged along the annular oil inlet groove; one end of the oil guide groove is connected to the annular oil inlet groove, and the other end extends inward at an angle and penetrates to the end of the iron core assembly. Two end cores are respectively abutted against the two axial ends of the core assembly and are coaxially arranged with the core assembly; The two end cores and the core assembly are each provided with the mounting groove and the core oil passage; the two oil guide grooves are respectively connected to the core oil passages on the two end cores.
[0015] By setting the stator core into a core assembly and end cores, the cooling oil can easily enter from the annular oil inlet groove in the core assembly, and then the cooling oil can be guided to the end cores at both ends to ensure the consistency of the cooling effect at both ends of the stator core.
[0016] In some embodiments, the core assembly includes: Core stacking; Two sets of intermediate iron cores are symmetrically abutted against both ends of the core laminations and are coaxially arranged with the core laminations; each set of intermediate iron cores is provided with a corresponding oil guide groove; The outer circumference of the core lamination is smaller than that of the intermediate iron core, so as to form the annular oil inlet groove between the two sets of intermediate iron cores.
[0017] By limiting the outer circumference of the core laminations to make them smaller than the outer circumference of the intermediate core, the aforementioned annular oil inlet groove is formed, thereby facilitating the introduction of cooling oil into the stator core.
[0018] For example, each set of intermediate iron cores includes a plurality of iron core laminations stacked coaxially in sequence, and each iron core lamination is provided with an oil passage hole corresponding to the mounting groove one by one; In the radial direction of the stator core, the oil passage holes on each of two adjacent core laminations partially overlap, so that multiple oil passage holes on the same set of core laminations are sequentially connected in the axial direction of the stator core, forming the oil guide groove. The oil passage adjacent to the core lamination is defined as the first oil passage, and the oil passage adjacent to the end core is defined as the second oil passage. In the radial direction of the stator core, the first oil passage partially overlaps with the annular oil inlet groove, and the second oil passage partially overlaps with the adjacent core oil passage, so that the two ends of the oil guide groove are correspondingly connected to the annular oil inlet groove and the core oil passage.
[0019] By setting oil passage holes on the iron core laminations, multiple oil passage holes are connected sequentially to form an oil guide groove, thereby guiding the cooling oil to each iron core oil passage. By setting the relative positions of each oil passage hole in the radial direction of the stator iron core, corresponding connections are achieved between adjacent oil passage holes, between oil passage holes and the annular oil inlet groove, and between oil passage holes and the iron core oil passage.
[0020] For example, the second oil passage is configured to communicate with the oil passage on the core lamination where it is located.
[0021] By specifically setting the second oil passage hole to connect with the core oil channel on the corresponding core lamination, the connection between the oil guide groove and the core oil channel can be directly achieved at the core lamination.
[0022] Secondly, embodiments of this application also provide an electric motor, including the oil-cooled structure of the stator assembly described above.
[0023] The motor provided in this application embodiment has all the beneficial effects of the above-mentioned stator assembly oil cooling structure because it includes the stator assembly oil cooling structure described above. Therefore, it can increase the creepage distance between the stator core and the stator winding of the motor, and improve the safety and reliability of the motor.
[0024] Thirdly, embodiments of this application also provide a vehicle including the aforementioned motor.
[0025] The vehicle provided in this application embodiment has all the beneficial effects of the motor described above because it includes the motor described above. Therefore, the motor of the vehicle can reduce the risk of leakage, avoid safety problems caused by motor leakage, and effectively improve the reliability and safety of the vehicle. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 A schematic diagram of the split structure of the oil cooling structure of the stator assembly provided in the embodiments of this application; Figure 2 A schematic diagram of the end face of the end core provided in an embodiment of this application; Figure 3 For the appendix Figure 2 Enlarged structural diagram at point A; Figure 4 This is an enlarged schematic diagram of the opening structure of the insulating groove paper; Figure 5 This is a schematic diagram of the core lamination structure used in the embodiments of this application. Figure 1 ; Figure 6 This is a schematic diagram of the core lamination structure used in the embodiments of this application. Figure 2 ; Figure 7 This is a schematic diagram of the core lamination structure used in the embodiments of this application; Figure 8 This is a schematic diagram of the stator core installation structure used in the embodiments of this application; Figure 9 For the appendix Figure 8 An enlarged structural diagram of point B in the middle.
[0028] In the diagram: 1. Stator core; 11. Core assembly; 111. Core laminations; 1111. Annular oil inlet groove; 112. Core laminations; 1121. Oil passage hole; 11211. First oil passage hole; 11212. Second oil passage hole; 12. End core; 13. Mounting groove; 14. Core oil passage; 2. Insulating groove paper; 21. First opening groove; 22. First end face; 23. Second side face; 24. First side face; 25. First boundary line; 26. Second boundary line; 3. Stator winding; 4. Frame. Detailed Implementation
[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0030] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0032] It should be noted that the orientation or positional relationship indicated by "inner" and "outer" in this embodiment is based on the orientation of the stator core 1 itself. The "inner" side is the inner ring side of the stator core 1, and the "outer" side is the outer ring side of the stator core 1.
[0033] It should be noted that the stator assembly includes the stator core 1, the stator winding 3, and the frame 4. The stator core 1 is an important component of the motor's magnetic circuit, and together with the rotor core and the air gap between the stator and rotor, it forms the complete magnetic circuit of the motor. The stator winding 3 is installed inside the stator core 1. To achieve cooling of the stator assembly, an oil passage needs to be provided on the stator core 1 to deliver cooling oil to the stator winding 3.
[0034] Furthermore, creepage distance refers to the charged area between two conductive components measured along the insulating surface, where the insulating material around the conductor becomes electrically charged under different usage conditions. It can be understood as the shortest path between two conductive components or between a conductive component and the equipment's protective interface, measured along the insulating surface. In this application, the two conductive components are the stator core 1 and the stator winding 3. The insulating slot paper 2 covers the stator winding 3, achieving mutual insulation between the stator core 1 and the stator winding 3. The creepage distance between the stator winding 3 and the stator core 1 is the shortest distance from the stator winding 3 to the stator core 1.
[0035] Furthermore, for ease of understanding, this application includes the following: Figure 4 The width distance of each face is marked in the middle; among them, the attached Figure 4 (a) and 4(b) are solutions in the prior art, wherein the side of the insulating groove paper 2 closest to the stator winding 3 directly abuts against the outer end face of the stator winding 3. Specifically, in Figure 4 In technical solution (a), the creepage distance between stator core 1 and stator winding 3 is: L1' + L2'; Figure 4 In the technical solution (b), the creepage distance between the stator core 1 and the stator winding 3 is L1', which is relatively short. Therefore, there is a risk of leakage, and the safety and reliability are poor. Moreover, in the existing technology, it is difficult to take into account the creepage distance between the stator winding 3 and the stator core 1 while ensuring that the opening size does not affect the introduction of cooling oil.
[0036] Please refer to the following: Figures 1 to 9The oil-cooling structure of the stator assembly, the motor, and the vehicle provided in this application will now be described. The oil-cooling structure of the stator assembly includes a stator core 1 and multiple insulating slots 2; the stator core 1 has a ring-shaped structure; multiple mounting slots 13 are provided on the inner ring of the stator core 1, and the multiple mounting slots 13 are spaced apart along the circumference of the stator core 1, and each mounting slot 13 has an oil channel 14 at its bottom; the mounting slots 13 are used to install stator windings 3; the multiple insulating slots 2 are arranged one-to-one with the multiple mounting slots 13; the insulating slots 2 cover the outer peripheral wall of the stator windings 3, and the two ends of the insulating slots 2 are spaced apart, forming a connection with the oil channel of the stator core. The first opening slot 21 is connected to channel 14; wherein, the opening end face of the insulating slot paper 2 is defined as the first end face 22; the side of the insulating slot paper 2 facing the stator winding 3 is defined as the first side face 24; the creepage path includes a first path and a second path, the first path is parallel to the width direction of the first side face 24, and the second path is parallel to the width direction of the first end face 22; the first side face 24 is inclined to the end face of the stator winding 3, and the two form a first acute angle, and the creepage path between the stator core 1 and the stator winding 3 includes the first path and the second path.
[0037] It should be noted that the creepage path defined in this application is not equivalent to the creepage distance; it is only for ease of explanation and can be understood as the length of the creepage path being equal to the creepage distance. Specifically, since the first path is parallel to the width direction of the first side surface 24, the length of the first path includes the distance from the vertex of the first acute angle to the first end face 22. Furthermore, when the second side surface 23 is partially placed within the iron core oil channel 14, as shown in the attached... Figure 4 (c), (e), and (f), the first path should also include the width distance of the second side within the iron core oil passage; when the second side is completely placed within the mounting groove, as shown in the appendix. Figure 4 (d) The length of the first path includes only the distance from the first acute angle vertex to the first end face. The length of the second path is equal to the width of the first end face.
[0038] Specifically, the insulating groove paper 2 is wrapped around the outer peripheral wall of the stator winding 3 in the corresponding mounting groove 13, forming the first opening groove 21 mentioned above. The insulating groove paper 2 is used to separate the stator winding 3 and the stator core 1 to ensure the insulation between the two, while not affecting the entry of the cooling oil.
[0039] For ease of explanation, the appendix to this application... Figure 4 In (c), (d), and (e), α is used to indicate the position of the first acute angle.
[0040] In this application, the cooling oil enters the mounting groove 13 through the iron core oil channel 14 and comes into contact with the stator winding 3 to achieve cooling. Furthermore, the proper arrangement of the insulating groove paper 2 ensures that the cooling oil circulates along a specified path, which can improve cooling efficiency, reduce the operating temperature of the stator winding 3, and extend its service life.
[0041] It should be noted that the oil passages 14 in the stator core 1 are all axially connected to the mounting grooves 13, and the length directions of the first end face 22, the second side face 23, and the first side face 24 are also parallel to the axial direction of the stator core 1. The width direction of the first end face 22, the second side face 23, and the first side face 24 is the shorter side relative to its length direction, and the specific starting position of its width can be found in the appendix. Figure 4 The indicated location.
[0042] It should be understood that the first side surface 24 is inclined to the end face of the stator winding 3. Therefore, the first side surface 24 extends from the intersection with the end face of the stator winding 3 towards the iron core oil passage 14, thereby forming a first acute angle between the first side surface 24 and the outer end face of the stator winding 3. The first path includes, but is not limited to, the path from the vertex of the first acute angle to the first end face 22. The length of the first path includes, but is not limited to, the distance from the vertex of the first acute angle to the first end face 22. Therefore, the creepage distance includes, but is not limited to, the distance from the vertex of the first acute angle to the first end face 22.
[0043] According to the appendix Figure 4 As can be seen from (a) and 4(b), if the first side surface 24 abuts against the outer end face of the stator winding 3, then the first side surface 24 coincides with the outer end face of the stator winding 3. Therefore, at this time, the creepage distance between the stator winding 3 and the stator core 1 does not include the width distance of the first side surface 24. However, in this application, the first side surface 24 is inclined to the end face of the stator winding 3. Therefore, the first side surface 24 is separated from the outer end face of the stator winding 3 from the included angle. Therefore, the length of the first path increases, that is, the creepage distance increases. Specifically, the creepage distance increases the distance between the first acute angle vertex and the first end face 22.
[0044] Compared with the prior art, the stator assembly oil cooling structure provided in this application has the aforementioned core oil channel 14 on the stator core 1 and the first opening groove 21 on the insulating slot paper 2. This allows the cooling oil to directly enter the stator winding 3 covered by the insulating slot paper 2 through the core oil channel 14 and the first opening groove 21 to cool the stator winding 3 and ensure the cooling effect. Compared with the conventional method where the first side 24 is attached to the outer end face of the stator winding 3, this application makes the first side 24 of the first opening groove 21 inclined to the outer end face of the stator winding 3 to form the aforementioned first acute angle structure between the insulating slot paper 2 and the stator winding 3. This increases the creepage distance between the stator core 1 and the stator winding 3, that is, increases the length of the first path. Specifically, it increases the distance between the vertex of the first acute angle and the first end face 22, so that the length of the creepage distance meets the safety requirements, reduces the risk of leakage, and thus improves the safety and stability of the stator assembly.
[0045] In the embodiments provided in this application, the solution can take into account both cooling effect and safety. That is, while ensuring that the cooling oil is smoothly introduced into the stator winding 3, it can effectively increase the creepage distance between the stator core 1 and the stator winding 3, thereby improving the safety and reliability of the stator assembly.
[0046] Please see Figure 4 (c) to (f), in some possible embodiments, the side of the insulating groove paper 2 facing away from the outer end face of the stator winding 3 is defined as the second side surface 23; the second side surface 23 is at least partially placed in the iron core oil channel 14; the width of the part of the second side surface 23 placed in the iron core oil channel 14 is defined as the first width; the distance from the first end face 22 to the vertex of the first acute angle is defined as the second width; the creepage distance between the stator iron core 1 and the stator winding 3 is the sum of the first width, the second width and the width of the first end face 22.
[0047] It is understandable that, in the recessed direction of the mounting groove 13, the parallel sides of the insulating groove paper 2 connected to the first end face 22 are the second side 23 and the first side 24, respectively. The second side 23 is close to the outer ring wall of the annular structure, and the first side 24 is close to the stator winding 3; or, the first side 24 is close to the inner ring wall of the stator core 1.
[0048] Additionally, it should be noted that, in the circumferential direction of the stator core 1, the width of the core oil channel 14 is smaller than the width of the mounting groove 13, so as to form two sets of opposing stepped surfaces at the connection between the core oil channel 14 and the mounting groove 13. The first end face 22 of the insulating groove paper 2 extends obliquely over the stepped surface along the second side face 23 and extends into the core oil channel 14.
[0049] For ease of understanding, please refer to the appendix to this application. Figure 4 (c) and 4(e), at this time, the second side 23 abuts against the groove wall of the mounting slot 13 of the stator core 1, and the extended part of the second side 23 does not contact the groove wall of the mounting slot 13 of the stator core 1. Therefore, the width of the extended part of the second side 23 can increase the creepage distance between the stator core 1 and the stator winding 3. Specifically, the width of the extended part of the second side 23 is the first width, i.e., L3; the distance from the first end face 22 to the vertex of the first acute angle is the second width, i.e., L2; the width of the first end face 22 is L1; therefore, the creepage distance between the stator core 1 and the stator winding 3 is L1+L2+L3.
[0050] By extending the second side 23 into the core oil passage 14, the first end face 22 is moved away from the groove wall of the stator core mounting slot 13, thereby increasing the creepage distance between the stator core 1 and the stator winding 3 by a second width, thereby increasing the creepage distance, further reducing the risk of leakage, and improving the safety and reliability of the stator assembly.
[0051] For example, when the first end face 22 of each insulating groove paper 2 is placed in the mounting groove 13, please refer to the appendix of this application for details. Figure 4 (d) At this time, the creepage distance between the stator core 1 and the stator winding 3 includes only the sum of the second width L2 and the width L1 of the first end face 22, that is, the creepage distance between the stator core 1 and the stator winding 3 is the length of L1+L2.
[0052] It should be understood that at this time, the second side 23 abuts against the groove wall of the mounting groove 13 of the stator core 1. Therefore, in this embodiment, the width of the second side 23 cannot be considered as the creepage distance.
[0053] Please see Figure 4 (c) In some embodiments, the first end face 22 is perpendicular to the first side face 24 and the second side face 23, and the opening size of the first opening groove 21 formed by the two first end faces 22 gradually increases in the direction away from the mounting groove 13.
[0054] It should be understood that by setting the first end face 22, the first side face 24, and the second side face 23 perpendicularly, the opening of the first opening groove 21 can be gradually enlarged, thereby forming a funnel-shaped structure to facilitate the drainage of cooling oil.
[0055] It is important to understand that the vertical first end face 22 and the gradually increasing opening size make the structure of the insulating groove paper 2 within the mounting groove 13 more stable. During motor operation, it can effectively resist external forces such as vibration and impact, prevent the insulating groove paper 2 from shifting or deforming, ensure that its covering and insulation effect on the stator winding 3 remains good, maintain the stability of the creepage distance, and ensure the safe operation of the motor.
[0056] Please see Figure 4 (e) In some embodiments, the angle between each first end face 22 and the first side face is an obtuse angle, and the opening size of the first opening groove 21 formed by the two first end faces 22 remains unchanged.
[0057] By making the angle between the first end face 22 and the first side face 24 obtuse, the width of the second side face 23 can be further increased, thereby increasing the creepage distance between the stator core 1 and the stator winding 3 and improving the safety of the stator assembly.
[0058] In this embodiment, by further extending the creepage distance, it is possible to better cope with various complex working conditions, enhance the reliability of the motor in terms of electrical insulation, and reduce the probability of electrical faults caused by insufficient creepage distance.
[0059] Additionally, please see the appendix. Figure 4(f) When the first end face 22 is perpendicular to both the first side face 24 and the second side face 23, the surface where the first end face 22 is located is defined as the first boundary surface, and the orthographic projection edge of the first boundary surface is located at the first boundary line 25; when the first end face 22 is parallel to the side wall of the iron core oil passage 14, the surface where the first end face 22 is located is defined as the second boundary surface, and the orthographic projection edge of the second boundary surface is located at the second boundary line 26; it can be seen that the included angle between the first boundary line 25 and the second boundary line 26 is the first acute angle α, and the included angle between the second boundary line 26 and the first side face 24 is the sum of 90° and the first acute angle α.
[0060] When the first end face 22 is adjusted from the first boundary face to the second boundary face, the orthographic projection line of the first end face 22 is adjusted from the first boundary line 25 to the second boundary line 26. At this time, the creepage distance gradually increases, and the size of the first opening slot 21 gradually decreases. Therefore, when the first end face 22 is between the first boundary face and the second boundary face, the creepage distance and the size of the first opening slot 21 can be changed. Therefore, the setting position of the first end face 22 can be selectively set between the first boundary face and the second boundary face according to actual needs.
[0061] Furthermore, in order to achieve positional changes of the first end face 22, a cut can be provided at the end of the insulating groove paper 2 to form the positions of the first end face 22 with different bevel angles.
[0062] Please see Figure 1 and Figure 8 In some possible embodiments, the stator core 1 includes a core assembly 11 and two end cores 12; the outer periphery of the middle part of the core assembly 11 is provided with an inwardly recessed annular oil inlet groove 1111; the core assembly 11 is also provided with two oil guide grooves symmetrically arranged along the annular oil inlet groove 1111; one end of the oil guide groove is connected to the annular oil inlet groove 1111, and the other end extends inward at an angle and passes through to the end of the core assembly 11; the two end cores 12 are correspondingly abutted against the two axial ends of the core assembly 11 and are coaxially arranged with the core assembly 11; wherein, both end cores 12 and the core assembly 11 are provided with mounting grooves 13 and core oil passages 14; the two oil guide grooves are respectively connected to the core oil passages 14 on the two end cores 12.
[0063] It should be understood that the cooling oil enters from the annular oil inlet groove 1111, flows through the oil guide groove to the core oil passages 14 of the end cores 12 at both ends, and enters the core oil passages 14 of the core assembly 11. Then it enters the mounting groove 13 from the core oil passages 14 to cool the stator winding 3, and finally flows back, achieving efficient circulating cooling, which greatly improves the cooling efficiency and reduces the operating temperature of the stator winding 3.
[0064] By setting the stator core 1 into a core assembly 11 and end cores 12, the cooling oil can easily enter from the annular oil inlet groove 1111 in the core assembly 11, and then guide the cooling oil to the end cores 12 at both ends, so as to ensure the consistency of the cooling effect at both ends of the stator core 1.
[0065] In addition, the stator core 1 is designed as a structure composed of core assembly 11 and end core 12. Through reasonable connection and matching methods, the entire stator core 1 is more stable in mechanical performance.
[0066] It should be noted that the other end of the oil guide groove in this application extends inward at an angle and penetrates to the end of the iron core assembly 11. Specifically, in order to communicate with the iron core oil passage 14 on the iron core assembly, the other end of the oil guide groove needs to extend into the inner ring of the stator iron core 1, that is, extend inward, and the direction of extension should also be close to the end iron core 12. Therefore, it needs to be set in an angle along the radial direction of the stator iron core 1, that is, angled and extended inward, so as to communicate with the iron core oil passage 14 on the end iron core 12.
[0067] Please see Figure 1 In some embodiments, the core assembly 11 includes a core lamination 111 and two sets of intermediate cores; the two sets of intermediate cores are symmetrically abutted against both ends of the core lamination 111 and are coaxially arranged with the core lamination 111; each set of intermediate cores is provided with a corresponding oil guide groove; wherein, the outer circumference of the core lamination 111 is smaller than the outer circumference of the intermediate core, so as to form an annular oil inlet groove 1111 between the two sets of intermediate cores.
[0068] By limiting the outer circumference of the core lamination 111 so that the outer circumference of the core lamination 111 is smaller than the outer circumference of the intermediate iron core, the aforementioned annular oil inlet groove 1111 is formed, thereby facilitating the introduction of cooling oil into the stator iron core 1.
[0069] In this embodiment, the size differences of each part of the core assembly 11 are cleverly utilized to construct the annular oil inlet groove 1111, which provides a centralized and effective entry channel for the cooling oil, allowing the cooling oil to flow more smoothly into the core assembly 11, providing sufficient oil supply for subsequent cooling cycles and improving the working efficiency of the cooling system.
[0070] Please see Figures 7 to 9For example, each set of intermediate iron cores includes multiple core laminations 112 stacked coaxially in sequence, and each core lamination 112 is provided with an oil passage hole 1121 corresponding to the mounting groove 13; wherein, in the radial direction of the stator iron core 1, the oil passage holes 1121 on every two adjacent core laminations 112 partially overlap, so that the multiple oil passage holes 1121 on the same set of core laminations 112 are sequentially connected in the axial direction of the stator iron core 1, forming an oil guide groove; definition The oil passage 1121 adjacent to the core lamination 111 is the first oil passage 11211, and the oil passage 1121 adjacent to the end core 12 is the second oil passage 11212. In the radial direction of the stator core 1, the first oil passage 11211 is partially overlapped with the annular oil inlet groove 1111, and the second oil passage 11212 is partially overlapped with the adjacent core oil channel 14, so that the two ends of the oil guide groove are correspondingly connected to the annular oil inlet groove 1111 and the core oil channel 14.
[0071] It should be understood that, axially from the core lamination 111 to the end core 12, the oil passage holes 1121 on two adjacent core laminations 112 partially overlap in the radial direction of the stator core 1.
[0072] In this embodiment, by providing oil passage holes 1121 on the iron core laminations 112, multiple oil passage holes 1121 are connected in sequence to form an oil guide groove, thereby guiding the cooling oil to each iron core oil passage 14.
[0073] Furthermore, by setting the relative positions of each oil passage hole 1121 in the radial direction of the stator core 1, corresponding connections are achieved between adjacent oil passage holes 1121, between oil passage holes 1121 and the annular oil inlet groove 1111, and between oil passage holes 1121 and the core oil passage 14. Through a simple stacking method of the core laminations 112, an oil guide groove is cleverly constructed, allowing the cooling oil to flow smoothly along the axial direction inside the core assembly 11. This transports the cooling oil from the annular oil inlet groove 1111 to the core oil passage 14, ensuring uniform distribution and effective circulation of the cooling oil inside the stator core 1 and improving the cooling effect.
[0074] The relative positions of each oil passage 1121 are set to ensure that the cooling oil can flow along a predetermined path, avoiding problems such as oil leakage, ensuring the efficient and stable operation of the cooling system, and further improving the cooling performance and reliability of the stator assembly.
[0075] Please see Figure 6 For example, the second oil passage 11212 is configured to communicate internally and externally with the core oil passage 14 on the core lamination 112 to which it is located.
[0076] By specifically setting the second oil passage 11212 to connect with the core oil passage 14 on the corresponding core lamination 112, the connection between the oil guide groove and the core oil passage 14 can be directly realized at the core lamination 112.
[0077] This connection further improves the flow path of the cooling oil. Specifically, starting from the annular oil inlet groove 1111, the cooling oil enters the iron core oil passage 14 through the oil guide groove and the second oil passage hole 11212, and then enters the mounting groove 13 to cool the stator winding 3 in the mounting groove 13, thereby maintaining the stable operation of the motor.
[0078] Please see Figure 9 For example, each set of intermediate iron cores includes multiple iron core laminations 112. Specifically, each set of intermediate iron cores includes a first lamination and a second lamination. The first lamination is disposed near the core lamination 111 and has a first oil passage hole 11211. The second lamination is disposed near the end iron core 12 and has a second oil passage hole 11212. In this embodiment, the outer edge of the first oil passage hole 11211 overlaps with the annular oil inlet groove 1111, and the inner edge overlaps with the outer edge of the second oil passage hole 11212. The inner edge of the second oil passage hole 11212 overlaps with the iron core oil channel 14 on the end iron core 12, or the inner edge of the second oil passage hole 11212 communicates with the iron core oil channel 14 on the second lamination. For easier understanding, please refer to the appendix of this application. Figure 5 and attached Figure 6 , attached Figure 5 The middle section is the first stack of fragments, with appendices. Figure 6 This is the second stack.
[0079] For example, each set of intermediate iron cores includes multiple iron core laminations 112. Specifically, each set of intermediate iron cores includes a first lamination, a second lamination, and a third lamination. The first lamination is disposed near the core lamination 111 and is provided with a first oil passage hole 11211. The second lamination is disposed near the end iron core 12 and is provided with a second oil passage hole 11212. The third lamination is disposed between the first lamination and the second lamination. In this embodiment, the outer edge of the first oil passage hole 11211 overlaps with the annular oil inlet groove 1111, and the inner edge overlaps with the outer edge of the oil passage hole 1121 on the third lamination. The inner edge of the oil passage hole 1121 on the third lamination overlaps with the outer edge of the second oil passage hole 11212. The inner edge of the second oil passage hole 11212 overlaps with the iron core oil channel 14 on the end iron core 12. Alternatively, the inner edge of the second oil passage hole 11212 communicates with the iron core oil channel 14 on the second lamination.
[0080] Furthermore, the specific number of iron core laminations 112 can be selectively set according to actual needs.
[0081] Based on the same inventive concept, embodiments of this application also provide an electric motor, including the oil-cooled structure of the stator assembly described above.
[0082] The motor provided in this application embodiment has all the beneficial effects of the above-mentioned stator assembly oil cooling structure because it includes the stator assembly oil cooling structure described above. Therefore, it can increase the creepage distance between the stator core 1 and the stator winding 3 of the motor, thereby improving the safety and reliability of the motor.
[0083] The motor provided in this application balances cooling performance and safety. The design of the insulating groove paper 2 on the motor greatly enhances the motor's insulation performance and reduces the risk of leakage. For example, under various operating conditions, especially in humid or harsh environments, it can effectively prevent electrical faults and ensure reliable motor operation. Therefore, while ensuring that the cooling oil can smoothly cool the stator windings 3 of the motor, the safety and reliability of the motor are effectively improved.
[0084] Based on the same inventive concept, embodiments of this application also provide a vehicle including a motor.
[0085] The vehicle provided in this application embodiment has all the beneficial effects of the motor described above because it includes the motor described above. Therefore, the motor of the vehicle can reduce the risk of leakage, avoid safety problems caused by motor leakage, and effectively improve the reliability and safety of the vehicle.
[0086] The vehicle is equipped with a motor featuring efficient heat dissipation and enhanced safety. The improved motor reliability reduces the probability of vehicle malfunctions due to motor failure. Specifically, the stator assembly's oil-cooled structure enhances insulation performance, reducing the risk of leakage, while the optimized structural design ensures stable motor operation under various conditions. This makes the vehicle more reliable during operation, reduces maintenance costs and safety hazards caused by motor problems, improves the user experience, and enhances the vehicle's market competitiveness.
[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An oil-cooled structure for a stator assembly, characterized in that, include: The stator core (1) has a ring-shaped structure; the inner ring of the stator core (1) is provided with multiple mounting slots (13), and the multiple mounting slots (13) are spaced apart along the circumference of the stator core (1). Each mounting slot (13) has a core oil passage (14) at the bottom; the mounting slots (13) are used to install the stator windings (3); Multiple insulating grooves (2) are provided one-to-one with multiple mounting grooves (13); the insulating grooves (2) are covered on the outer peripheral wall of the stator winding (3), and the two ends of the insulating grooves (2) are spaced apart to form a first opening groove (21) that communicates with the iron core oil passage (14); Wherein, the open end face of the insulating groove paper (2) is defined as the first end face (22); the side of the insulating groove paper (2) facing the stator winding (3) is defined as the first side face (24); the creepage path includes a first path and a second path, the first path is parallel to the width direction of the first side face (24), and the second path is parallel to the width direction of the first end face (22); the first side face (24) is inclined to the end face of the stator winding (3), and the two form a first acute angle, and the creepage path between the stator core (1) and the stator winding (3) includes the first path and the second path.
2. The oil-cooled structure of the stator assembly as described in claim 1, characterized in that, The side of the insulating groove paper (2) facing away from the outer end face of the stator winding (3) is defined as the second side surface (23); the second side surface (23) is at least partially placed in the iron core oil passage (14); The width of the portion of the second side (23) placed within the iron core oil passage (14) is defined as the first width; the distance from the first end face (22) to the vertex of the first acute angle is defined as the second width; the creepage distance between the stator iron core (1) and the stator winding (3) is the sum of the first width, the second width, and the width of the first end face (22).
3. The oil-cooled structure of the stator assembly as described in claim 2, characterized in that, The first end face (22) is perpendicular to the first side face (24) and the second side face (23), and the opening size of the first opening groove (21) formed by the two first end faces (22) gradually increases in the direction away from the mounting groove (13).
4. The oil-cooled structure of the stator assembly as described in claim 2, characterized in that, The angle between each of the first end faces (22) and the first side face (24) is an obtuse angle, and the opening size of the first opening groove (21) formed by the two first end faces (22) remains unchanged.
5. The oil-cooled structure of the stator assembly as described in claim 1, characterized in that, The stator core (1) includes: The iron core assembly (11) has an inwardly recessed annular oil inlet groove (1111) on its outer periphery in the middle; the iron core assembly (11) also has two guide grooves symmetrically arranged along the annular oil inlet groove (1111); one end of the guide groove is connected to the annular oil inlet groove (1111), and the other end extends inward at an inclination and penetrates to the end of the iron core assembly (11); Two end cores (12) abut against the two axial ends of the core assembly (11) and are coaxially arranged with the core assembly (11); The two end cores (12) and the core assembly (11) are provided with the mounting groove (13) and the core oil passage (14); the two oil guide grooves are respectively connected to the core oil passage (14) on the two end cores (12).
6. The oil-cooled structure of the stator assembly as described in claim 5, characterized in that, The core assembly (11) includes: Core stack (111); Two sets of intermediate iron cores are symmetrically abutted against both ends of the core lamination (111) and are coaxially arranged with the core lamination (111); each set of intermediate iron cores is provided with a corresponding oil guide groove; Wherein, the outer circumference of the core lamination (111) is smaller than the outer circumference of the intermediate iron core, so as to form the annular oil inlet groove (1111) between the two sets of intermediate iron cores.
7. The oil-cooled structure of the stator assembly as described in claim 6, characterized in that, Each set of intermediate iron cores includes multiple iron core laminations (112) stacked coaxially in sequence, and each iron core lamination (112) is provided with an oil passage hole (1121) corresponding to the mounting groove (13). In the radial direction of the stator core (1), the oil passage holes (1121) on each of two adjacent core laminations (112) are partially overlapped, so that multiple oil passage holes (1121) on the same set of core laminations (112) are sequentially connected in the axial direction of the stator core (1) to form the oil guide groove; The oil passage (1121) adjacent to the core lamination (111) is defined as the first oil passage (11211), and the oil passage (1121) adjacent to the end core (12) is defined as the second oil passage (11212). In the radial direction of the stator core (1), the first oil passage (11211) partially overlaps with the annular oil inlet groove (1111), and the second oil passage (11212) partially overlaps with the adjacent core oil channel (14), so that the two ends of the oil guide groove are correspondingly connected to the annular oil inlet groove (1111) and the core oil channel (14).
8. The oil-cooled structure of the stator assembly as described in claim 7, characterized in that, The second oil passage (11212) is connected internally and externally to the core oil passage (14) on the core lamination (112) where it is located.
9. An electric motor, characterized in that, Including the oil-cooled structure of the stator assembly as described in any one of claims 1-8.
10. A vehicle, characterized in that, Includes the motor as described in claim 9.