Stator core and oil-cooled motor
By designing the oil injection chamber, oil distribution chamber, and oil injection port in the stator core, the problem of inconsistent oil supply from the oil injection ring in oil-cooled motors is solved, achieving uniform oil distribution and simplifying the structure to meet high-performance cooling requirements.
Patent Information
- Application Number
- CN202520258277.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-18
AI Technical Summary
In existing automotive oil-cooled motors, inconsistent oil supply efficiency of the injection ring leads to different cooling effects on the two windings, resulting in a complex structure and high cost.
The stator core design includes an oil injection chamber, an oil distribution chamber, an oil collection chamber, and an oil spray nozzle. This ensures that the oil is evenly distributed to the windings on both sides. The oil injection chamber is connected to the motor housing. The oil distribution chamber is used to balance the oil pressure. The oil spray nozzle discharges the oil to the surface of the windings.
It achieves uniform oil distribution, ensures consistent cooling effect on both sides of the winding, simplifies the structure, reduces production costs, and meets high performance requirements.
Smart Images
Figure CN223583903U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of automotive motor technology, specifically relating to a stator core and an automotive motor. Background Technology
[0002] An oil-cooled motor is a type of motor that uses oil as a cooling medium and is mainly used in electric or hybrid vehicles. The oil-cooled motor removes the heat generated during operation directly or indirectly through the flow of oil inside the motor. Compared to traditional air-cooled and water-cooled motors, oil-cooled motors have higher cooling efficiency and can better meet the demands of high power density and high performance.
[0003] In the existing technology, two oil injection rings are usually used to inject oil into the stator core. Specifically, an oil passage is opened on the stator core, and two oil injection rings are respectively set at both ends of the stator core. When the motor starts, the two oil injection rings start synchronously to inject oil into both ends of the stator core. The oil is collected and recycled through the oil passage to achieve cooling of the windings on both sides.
[0004] The inventors discovered that, in actual use, due to external factors, the oil supply efficiency of the two oil injection rings cannot be kept consistent, resulting in different cooling effects on the two windings. At the same time, the overall structure of using two oil injection rings is complex, with high production costs and low economic benefits. Utility Model Content
[0005] This application provides a stator core and an oil-cooled motor, which, while ensuring a simplified overall structure, aims to distribute the oil evenly to the windings on both sides for cooling, so as to meet the high performance requirements of the oil-cooled motor.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0007] A stator core is provided, comprising:
[0008] The first iron core lamination group has an oil injection cavity extending circumferentially thereon and an oil distribution cavity extending axially thereon; the oil distribution cavity is connected to the oil injection cavity.
[0009] The second core lamination group is coaxially and symmetrically arranged on both sides of the first core lamination group, and its diameter is smaller than that of the first core lamination group, so as to form an oil conduit surrounding the second core lamination group; and
[0010] The third iron core lamination group is coaxially and symmetrically arranged on both sides of the second iron core lamination group, and its diameter is equal to that of the first iron core lamination group; the third iron core lamination group has multiple oil injection ports that communicate with the oil collection cavity.
[0011] In one possible implementation, the first core lamination group includes:
[0012] Two sets of coaxially arranged outer iron core laminations; and
[0013] The inner core laminations are coaxially arranged between the two sets of outer core laminations, and their diameter is smaller than that of the outer core laminations, so as to form the oil injection cavity surrounding the inner core laminations;
[0014] Each set of outer core laminations has multiple oil distribution holes, each of which is axially connected to the oil injection cavity, so that the multiple oil distribution holes constitute the oil distribution cavity.
[0015] In one possible implementation, the inner core laminations include:
[0016] Two first core laminations are coaxially arranged and respectively connected to the two adjacent sides of the two sets of outer core laminations. Each first core lamination has a plurality of first protrusions spaced circumferentially on its outer peripheral surface.
[0017] The second core lamination is coaxially disposed between the two first core laminations and has a diameter equal to that of the first core laminations; the outer circumferential surface of the second core lamination has a plurality of second protrusions spaced apart along its circumference.
[0018] The plurality of second protrusions are adapted to correspond one-to-one with the plurality of first protrusions to form a plurality of partitions spaced apart along the extension direction of the oil injection channel, and to divide the oil injection channel into a plurality of oil injection chambers.
[0019] One or more of the oil filling chambers are used to communicate with the oil filling port on the motor housing, and there is an oil passage structure between two adjacent oil filling chambers along the extension direction of the oil filling channel.
[0020] In one possible implementation, the oil passage structure includes two sinkholes and an oil guide hole;
[0021] The sinking grooves are located on both sides of the first protrusion and are axially connected to the first iron core lamination; the oil guide holes are located on the second iron core lamination and are connected to the two sinking grooves.
[0022] Alternatively, the sinking grooves are formed on both sides of the second protrusion and are both through the axial direction of the second iron core lamination; the oil guide holes are formed on the first iron core lamination and are connected to the two sinking grooves.
[0023] In one possible implementation, the oil guide hole is located in the direction of the first protrusion toward the central axis of the first iron core lamination, or in the direction of the second protrusion toward the second iron core lamination, and is one of the following shapes: V-shaped, rectangular, arc-shaped, or wavy.
[0024] In one possible implementation, the outer peripheral surface of the second core lamination group has a plurality of third protrusions spaced apart along its circumference, and the two sides of the third protrusions respectively abut against the adjacent sides of the first core lamination group and the third core lamination group, so that the oil channel is divided into a plurality of oil chambers.
[0025] Each of the oil collection chambers is connected to at least one of the oil distribution holes and also to at least one of the oil injection ports.
[0026] In one possible implementation, the raised surfaces of the first protrusion, the second protrusion, and the third protrusion are all located on the same cylindrical surface as the outer peripheral surface of the third core lamination group, and the first protrusion, the second protrusion, and the third protrusion are arranged side by side along a straight line.
[0027] In one possible implementation, the third core lamination group includes:
[0028] Two sets of oil-sprayed laminations are coaxially and symmetrically arranged on both sides of the second iron core lamination group, and their diameters are equal to the diameters of the first iron core lamination group.
[0029] Each set of the oil spray laminations includes multiple third iron core laminations arranged coaxially. Each third iron core lamination has multiple through holes spaced apart along its circumference, and the multiple through holes of two adjacent third iron core laminations are connected one-to-one to form multiple oil spray ports.
[0030] In one possible implementation, the distances between the through holes and the central axis of the third core lamination are staggered in the circumferential direction of the third core lamination; each set of oil spray laminations includes two third core laminations, which are symmetrically arranged and staggered to form a plurality of oil spray ports inclined toward the central axis of the third core laminations, and a plurality of oil spray ports inclined away from the central axis of the third core laminations;
[0031] The third core lamination group also includes:
[0032] Two sets of oil-blocking plates are respectively disposed between the two sets of oil-spraying plates and the second iron core plate group to close the oil spraying port that is inclined away from the central axis of the third iron core plate; the oil-blocking plate has a plurality of oil drain holes that extend through it along its axial direction, each of the oil drain holes is connected to the oil collection cavity, and the plurality of oil spraying ports that are inclined towards the central axis of the third iron core plate are connected to the plurality of oil drain holes one by one.
[0033] In this embodiment of the application, the oil filling channel is connected to the oil filling port of the motor housing, so that the oil injected into the motor can enter the oil filling channel. After the oil enters the oil filling channel, the oil distribution channels on both sides can evenly distribute the oil to the oil collection channels on both sides, so as to balance the internal oil pressure. At the same time, the oil can be discharged to the winding surface through the oil spray port to achieve the purpose of cooling.
[0034] Compared with the prior art, the stator core provided in this embodiment can ensure the simplification of the overall structure while uniformly distributing the oil to the cooling of the windings on both sides, so as to meet the high performance requirements of the oil-cooled motor.
[0035] The technical solution adopted in this application also provides an oil-cooled motor, including the stator core proposed in any of the foregoing claims.
[0036] The beneficial effects of the oil-cooled motor provided in this embodiment are the same as those of the aforementioned stator core, and will not be repeated here. Attached Figure Description
[0037] 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.
[0038] Figure 1 A three-dimensional structural schematic diagram of the stator core provided in the embodiments of this application;
[0039] Figure 2 for Figure 1 A magnified view of a portion of the middle circle A;
[0040] Figure 3 This is a schematic diagram of the exploded structure of the stator core provided in the embodiments of this application;
[0041] Figure 4 This is a schematic diagram of the structure of the first iron core lamination used in the embodiments of this application in the third embodiment;
[0042] Figure 5 This is a schematic diagram of the structure of the second core lamination used in the embodiments of this application under the third embodiment;
[0043] Figure 6 This is a schematic diagram of the second core lamination assembly used in the embodiments of this application from a frontal view.
[0044] Figure 7 This is a schematic diagram of the outer core laminations used in the embodiments of this application from a frontal view.
[0045] Figure 8 This is a schematic diagram of the oil-blocking laminate used in the embodiments of this application from a frontal view.
[0046] Figure 9 This is an exploded structural diagram of the third iron core lamination group used in the embodiments of this application;
[0047] Figure 10 A partially enlarged schematic diagram of the stator core provided in the embodiments of this application from a frontal view;
[0048] Figure 11 For along Figure 10 Partial sectional view of the middle BB line;
[0049] Figure 12 For along Figure 10 Partial cross-sectional view of the CC line;
[0050] Figure 13 This is a schematic diagram of the structure of the first core lamination used in the embodiments of this application under the first embodiment;
[0051] Figure 14 This is a schematic diagram of the structure of the second core lamination used in the embodiments of this application under the first embodiment;
[0052] Explanation of reference numerals in the attached drawings: 1. First core lamination group; 11. Outer core lamination; 12. Inner core lamination; 121. First core lamination; 1211. First protrusion; 122. Second core lamination; 1221. Second protrusion; 2. Second core lamination group; 21. Third protrusion; 3. Third core lamination group; 31. Third core lamination; 32. Oil-blocking lamination; 4. Oil passage structure; 41. Sinking groove; 42. Oil guide hole; 10. Oil injection cavity; 20. Oil distribution cavity; 30. Oil collection cavity; 40. Oil injection port. Detailed Implementation
[0053] 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.
[0054] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0055] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0056] Furthermore, 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. Thus, 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.
[0057] Please refer to the following: Figures 1 to 14 The stator core provided in this application will now be described. The stator core proposed in this application includes a first core lamination group 1, a second core lamination group 2, and a third core lamination group 3.
[0058] The first core lamination assembly 1 is coaxially mounted inside the motor housing, and an oil injection channel 10 extending circumferentially is formed on the outer peripheral surface of the first core lamination assembly 1. This oil injection channel 10 is used to communicate with the oil injection port of the motor housing. The first core lamination assembly 1 also has an oil distribution channel 20 extending axially, and this oil distribution channel 20 is connected to the oil injection channel 10 so that the oil in the oil injection channel 10 is evenly distributed to both ends of the first core lamination assembly 1.
[0059] The second core lamination group 2 is coaxially and symmetrically arranged on both sides of the first core lamination group 1, and its diameter is smaller than that of the first core lamination group 1, so as to form an oil collection channel 30 surrounding the second core lamination group 2, thereby collecting the oil output from both ends of the first core lamination group 1 and realizing the oil pressure balance inside the structure.
[0060] The third core lamination group 3 is coaxially and symmetrically arranged on both sides of the second core lamination group 2, and its diameter is equal to that of the first core lamination group 1, so as to seal the port of the oil collection channel 30; the sealing surface of the third core lamination group 3 has multiple oil injection ports 40 that communicate with the oil collection channel 30, so that the oil in the oil collection channel 30 is discharged to the winding on the inner side of the stator core.
[0061] In this embodiment, the oil injection channel 10 is connected to the oil injection port of the motor housing, allowing the oil injected into the motor to enter the oil injection channel 10. After the oil enters the oil injection channel 10, the oil distribution channels 20 on both sides can evenly distribute the oil to the oil collection channels 30 on both sides, so as to balance the internal oil pressure. At the same time, the oil can be discharged to the winding surface through the oil injection port 40 to achieve the purpose of cooling.
[0062] Compared with the prior art, the stator core provided in this embodiment can ensure the simplification of the overall structure while uniformly distributing the oil to the cooling of the windings on both sides, so as to meet the high performance requirements of the oil-cooled motor.
[0063] In some embodiments, such as Figures 1 to 3 As shown, the first core lamination group 1 includes two sets of outer core laminations 11 and inner core laminations 12.
[0064] Two sets of outer iron core laminations 11 are coaxially arranged and arranged side by side inside the motor housing.
[0065] The inner core lamination 12 is coaxially disposed between two sets of outer core laminations 11, with the two sets of outer core laminations 11 attached to its two sides respectively. The diameter of the inner core lamination 12 is smaller than the diameter of the outer core laminations 11, so as to form an oil injection channel 10 surrounding the inner core lamination 12. This oil injection channel 10 is connected to the oil injection port of the motor housing.
[0066] Based on this, each set of outer core laminations 11 has multiple oil distribution holes along its circumference. Each oil distribution hole is axially connected to the outer core lamination 11 and communicates with the oil injection channel 10, so that the multiple oil distribution holes constitute the aforementioned oil distribution channel 20.
[0067] In some embodiments, such as Figures 1 to 3 As shown, the inner core lamination 12 includes two first core laminations 121 and a second core lamination 122.
[0068] Two first core laminations 121 are coaxially arranged and are respectively connected to the two sides of the two sets of outer core laminations 11; each first core lamination 121 has a plurality of first protrusions 1211 arranged at intervals along its circumference on its outer peripheral surface.
[0069] The second core lamination 122 is coaxially disposed between the two first core laminations 121, and its diameter is equal to the diameter of the first core lamination 121; the outer circumferential surface of the second core lamination 122 has a plurality of second protrusions 1221 spaced apart along its circumference.
[0070] The number of second protrusions 1221 is equal to the number of first protrusions 1211 on a single first core lamination 121. After the first core lamination 121 and the second core lamination 122 are attached together, the multiple second protrusions 1221 are adapted to correspond one-to-one with the multiple first protrusions 1211 to form multiple partitions spaced apart along the extension direction of the oil injection channel 10, thereby dividing the oil injection channel 10 into multiple oil injection chambers.
[0071] Based on this, one or more of the oil filling chambers are used to communicate with the oil filling port on the motor housing (normally, the oil filling port on the motor housing is single, so there is only one oil filling chamber connected to the oil filling port), and there is an oil passage structure 4 between two adjacent oil filling chambers along the extension direction of the oil filling channel 10, so that the oil is distributed along the extension direction of the oil filling channel 10, thereby filling each oil filling chamber.
[0072] In some embodiments, such as Figures 2 to 5 , Figure 13 and Figure 14 As shown, the oil passage structure 4 includes two sinkholes 41 and an oil guide hole 42, specifically:
[0073] In the first embodiment, as Figure 13 and Figure 14 As shown, the sinking groove 41 is opened on both sides of the first protrusion 1211 and is axially connected to the first iron core lamination 121; the oil guide hole 42 is opened on the second iron core lamination 122, located at one of the second protrusions 1221 facing the central axis of the second iron core lamination 122, and when the first iron core lamination 121 and the second iron core lamination 122 are combined, the two ends of the oil guide hole 42 facing the axial direction of the second iron core lamination 122 are respectively connected to the two sinking grooves 41.
[0074] In the second embodiment, the sinking groove 41 is opened on both sides of the second protrusion 1221 and is axially connected to the second iron core lamination 122; the oil guide hole 42 is opened on the first iron core lamination 121, located at one of the first protrusions 1211 facing the central axis of the first iron core lamination 121, and when the first iron core lamination 121 and the second iron core lamination 122 are combined, the two ends of the oil guide hole 42 facing the first iron core lamination 121 are respectively connected to the two sinking grooves 41.
[0075] By adopting the first embodiment and the second embodiment, the oil entering the oil injection chamber will enter the sinking groove 41 at the end along the extension direction of the oil injection channel 10, thereby converging into and filling the oil guide hole 42, and finally entering the adjacent oil injection chamber from the other end of the oil guide hole 42.
[0076] In the third embodiment, as Figure 4 and Figure 5As shown, the first embodiment and the second embodiment are alternately arranged in the circumferential direction of the inner core laminations 12. Structurally, the first core lamination 121 and the second core lamination 122 adopt the same structure. Specifically, both the first core lamination 121 and the second core lamination 122 are provided with a recessed groove 41 and an oil guide hole 42.
[0077] On the first core lamination 121, for two adjacent first protrusions 1211 along the circumferential direction, one of the first protrusions 1211 is provided with a recessed groove 41 on both sides, and the other first protrusion 1211 is provided with an oil guide hole 42 at a position facing the central axis of the first core lamination 121.
[0078] On the second core lamination 122, for two adjacent second protrusions 1221 along the circumferential direction, one of the second protrusions 1221 is provided with a recessed groove 41 on both sides, and the other second protrusion 1221 is provided with an oil guide hole 42 at a position facing the central axis of the first core lamination 121.
[0079] Based on this, when the first iron core lamination 121 and the second iron core lamination 122 are bonded together, by rotating them at a preset angle, the two are bonded in a staggered manner. That is, the sinkhole 41 or oil guide hole 42 on the first iron core lamination 121 is bonded to the corresponding oil guide hole 42 or sinkhole 41 on the second iron core lamination 122, so that the corresponding oil passage structure 4 can be opened.
[0080] By adopting the third embodiment, not only can the aforementioned technical effects be achieved—that is, the oil entering the oil injection chamber will enter the sinking groove 41 at the end along the extension direction of the oil injection channel 10, thereby converging and filling the oil guide hole 42, and finally entering the adjacent oil injection chamber from the other end of the oil guide hole 42—but also the structures of the first iron core lamination 121 and the second iron core lamination 122 can be made completely identical, which facilitates actual manufacturing and the selection of related molds.
[0081] In some embodiments, such as Figure 4 and Figure 5 As shown, the oil guide hole 42 is located in the direction of the first protrusion 1211 toward the central axis of the first iron core lamination 121, or in the direction of the second protrusion 1221 toward the second iron core lamination 122, and adopts one of the following shapes: V-shaped, rectangular, arc-shaped, and wavy. In this embodiment, the oil guide hole 42 adopts a V-shaped structure to achieve oil convergence and ensure local oil pressure balance.
[0082] In some embodiments, such as Figure 3 and Figure 6 As shown, the outer peripheral surface of the second core lamination group 2 has a plurality of third protrusions 21 spaced apart along its circumference, and the two sides of the third protrusions 21 respectively abut against the adjacent sides of the first core lamination group 1 and the third core lamination group 3, so that the oil collection channel 30 is divided into a plurality of oil collection chambers.
[0083] Each oil collection chamber is connected to at least one oil distribution hole and at least one oil injection port 40 to realize the input and output of oil respectively.
[0084] In some embodiments, such as Figure 1 As shown, the raised surfaces of the first protrusion 1211, the second protrusion 1221, and the third protrusion 21 are all located on the same cylindrical surface as the outer peripheral surface of the third iron core lamination group 3, and the first protrusion 1211, the second protrusion 1221, and the third protrusion 21 are arranged side by side along a straight line to facilitate structural alignment.
[0085] It should be further explained that, based on the foregoing, the raised surfaces of the first protrusion 1211, the second protrusion 1221, the third protrusion 21, the outer peripheral surface of the third core lamination group 3, and the outer peripheral surface of the outer core lamination 11 all have welding grooves. After the structure is aligned, multiple welding grooves are joined together to form a strip-shaped groove structure to facilitate welding operations.
[0086] In some embodiments, such as Figures 9 to 12 As shown, the third core lamination group 3 includes two sets of oil-sprayed laminations.
[0087] Two sets of oil-spraying laminations are coaxially and symmetrically arranged on both sides of the second iron core lamination group 2, and their diameters are equal to the diameters of the first iron core lamination group 1.
[0088] Based on this, in this embodiment, each group of spray-painted laminations includes multiple third iron core laminations 31.
[0089] Multiple third core laminations 31 are coaxially arranged, and two adjacent third core laminations 31 are in contact with each other; each third core lamination 31 has multiple through holes spaced apart along its circumference, and the multiple through holes of two adjacent third core laminations 31 are connected one-to-one to form multiple aforementioned oil injection ports 40.
[0090] In some embodiments, such as Figures 9 to 12 As shown, the distances between the through holes and the central axis of the third core lamination 31 are staggered in the circumferential direction of the third core lamination 31; that is, for two adjacent through holes along the circumferential direction of the third core lamination 31, one is closer to the central axis of the third core lamination 31, and the other is farther away from the central axis of the third core lamination 31.
[0091] Each set of oil-spraying laminations includes two third iron core laminations 31. The two third iron core laminations 31 are symmetrically arranged and staggered to form multiple oil spray nozzles 40 that are inclined towards the central axis of the third iron core laminations 31 (along the oil output direction) and multiple oil spray nozzles 40 that are inclined away from the central axis of the third iron core laminations 31 (along the oil output direction). In actual use, the oil spray nozzles 40 that are inclined towards the central axis of the third iron core laminations 31 can spray oil onto the winding surface to achieve winding cooling.
[0092] By adopting the above technical solution, the structures of the two third iron core laminations 31 are completely identical, which facilitates actual processing.
[0093] Based on this, in this embodiment, the third core lamination group 3 also includes two sets of oil-blocking laminations 32.
[0094] Two sets of oil-blocking plates 32 are respectively disposed between the two sets of oil-spraying plates and the second iron core plate group 2, specifically disposed on both sides of the second iron core plate group 2 and located between the two sets of oil-spraying plates. After the oil-blocking plates 32 are installed, they can close the aforementioned oil spray port 40 that is inclined away from the central axis of the third iron core plate 31, so as to ensure that the oil input is directed toward the oil spray port 40 that is inclined toward the central axis of the third iron core plate 31.
[0095] The oil-blocking plate 32 has multiple oil drain holes spaced apart along its circumference and extending through its axial direction. Each oil drain hole is connected to the oil collection channel 30. Multiple oil spray ports 40, which are inclined toward the central axis of the third iron core plate 31, are connected to the multiple oil drain holes one by one to realize the input of oil.
[0096] It should be noted that in this embodiment, the stator core can be prepared using three different lamination structures. Specifically: the lamination structures of the first core lamination 121, the second core lamination 122, and the second core lamination group 2 in the third embodiment are the same, and are defined as lamination a; the lamination structures of the outer core lamination 11 and the oil-blocking lamination 32 are the same, and are defined as lamination b; the structures of the two third core laminations 31 are the same, and are defined as lamination c.
[0097] Based on the same inventive concept, this application also provides an oil-cooled motor, including the stator core proposed in any of the preceding claims.
[0098] The beneficial effects of the oil-cooled motor provided in this embodiment are the same as those of the aforementioned stator core, and will not be repeated here.
[0099] The above content is only 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. A stator core, characterized in that, include: The first core lamination group (1) has an oil injection channel (10) extending circumferentially therein, and an oil distribution channel (20) extending axially therein; the oil distribution channel (20) is connected to the oil injection channel (10); The second core lamination group (2) is coaxially and symmetrically arranged on both sides of the first core lamination group (1), and its diameter is smaller than that of the first core lamination group (1) to form an oil conduit (30) surrounding the second core lamination group (2); and The third core lamination group (3) is coaxially and symmetrically arranged on both sides of the second core lamination group (2), and its diameter is equal to that of the first core lamination group (1); the third core lamination group (3) has a plurality of oil injection ports (40) communicating with the oil channel (30).
2. The stator core as described in claim 1, characterized in that, The first core lamination group (1) includes: Two sets of coaxially arranged outer core laminations (11); and The inner core lamination (12) is coaxially arranged between the two sets of outer core laminations (11) and has a smaller diameter than the outer core laminations (11) to form the oil injection channel (10) surrounding the inner core lamination (12); Each set of outer core laminations (11) has multiple oil distribution holes, each of which is axially connected to the oil injection cavity (10) and forms the oil distribution cavity (20).
3. The stator core as described in claim 2, characterized in that, The inner core laminations (12) include: Two coaxially arranged first core laminations (121) are respectively connected to the adjacent sides of the two sets of outer core laminations (11), and each first core lamination (121) has a plurality of first protrusions (1211) spaced circumferentially on its outer peripheral surface; and The second core lamination (122) is coaxially disposed between the two first core laminations (121) and has a diameter equal to that of the first core laminations (121); the outer circumferential surface of the second core lamination (122) has a plurality of second protrusions (1221) spaced apart along its circumference. Among them, a plurality of second protrusions (1221) are adapted to be connected one-to-one with a plurality of first protrusions (1211) to form a plurality of partitions spaced apart along the extension direction of the oil injection channel (10), and to divide the oil injection channel (10) into a plurality of oil injection chambers; One or more of the oil filling chambers are used to communicate with the oil filling port on the motor housing, and two adjacent oil filling chambers along the extension direction of the oil filling channel (10) have an oil passage structure (4).
4. The stator core as described in claim 3, characterized in that, The oil passage structure (4) includes two sinkholes (41) and an oil guide hole (42); The sinking groove (41) is located on both sides of the first protrusion (1211) and is axially connected to the first iron core lamination (121); the oil guide hole (42) is located on the second iron core lamination (122) and is connected to the two sinking grooves (41). Alternatively, the sinking groove (41) is formed on both sides of the second protrusion (1221) and is axially connected to the second iron core lamination (122); the oil guide hole (42) is formed on the first iron core lamination (121) and is connected to the two sinking grooves (41).
5. The stator core as described in claim 4, characterized in that, The oil guide hole (42) is located in the direction of the first protrusion (1211) toward the central axis of the first iron core lamination (121), or in the direction of the second protrusion (1221) toward the second iron core lamination (122), and adopts one of the following shapes: V-shaped, long rectangle, arc shape, and wave shape.
6. The stator core as described in claim 3, characterized in that, The outer peripheral surface of the second iron core lamination group (2) has a plurality of third protrusions (21) spaced apart along its circumference, and the two sides of the third protrusions (21) respectively abut against the adjacent sides of the first iron core lamination group (1) and the third iron core lamination group (3), so that the oil collection channel (30) is divided into a plurality of oil collection chambers. Each of the oil collection chambers is connected to at least one of the oil distribution holes and also to at least one of the oil injection ports (40).
7. The stator core as described in claim 6, characterized in that, The raised surfaces of the first protrusion (1211), the second protrusion (1221), and the third protrusion (21) are all located on the same cylindrical surface as the outer peripheral surface of the third iron core lamination group (3), and the first protrusion (1211), the second protrusion (1221), and the third protrusion (21) are arranged side by side along a straight line.
8. The stator core as described in claim 1, characterized in that, The third core lamination group (3) includes: Two sets of oil-sprayed laminations are coaxially and symmetrically arranged on both sides of the second iron core lamination group (2), and their diameters are equal to the diameter of the first iron core lamination group (1). Each set of the oil spray stacks includes a plurality of third iron core stamps (31) arranged coaxially. Each third iron core stamp (31) has a plurality of through holes spaced apart along its circumference, and the plurality of through holes of two adjacent third iron core stamps (31) are connected one-to-one to form a plurality of oil spray ports (40).
9. The stator core as described in claim 8, characterized in that, In the circumferential direction of the third core lamination (31), the distance between the through hole and the central axis of the third core lamination (31) is staggered; each set of oil spray laminations includes two third core laminations (31), the two third core laminations (31) are symmetrically arranged and staggered to form a plurality of oil spray ports (40) inclined toward the central axis of the third core lamination (31), and a plurality of oil spray ports (40) inclined away from the central axis of the third core lamination (31); The third core lamination group (3) also includes: Two sets of oil-blocking plates (32) are respectively disposed between the two sets of oil-spraying plates and the second iron core plate group (2) to close the oil spray port (40) that is inclined away from the central axis of the third iron core plate (31); the oil-blocking plate (32) has a plurality of oil drain holes that extend along its axial direction, each of the oil drain holes is connected to the oil collection channel (30), and the plurality of oil spray ports (40) that are inclined towards the central axis of the third iron core plate (31) are connected to the plurality of oil drain holes one by one.
10. An oil-cooled motor, characterized in that, The stator core includes any one of claims 1-9.