Stator core, stator assembly, motor and vehicle

Abstract

The invention provides a stator core, a stator assembly, a motor and a vehicle. The end face of the stator core is provided with a first oil injection port and a second oil injection port, the stator core is provided with a first axial flow channel, a second axial flow channel and an oil inlet channel, the first axial flow channel and the second axial flow channel extend in the axial direction of the stator core, the first axial flow channel is arranged close to the geometric center of the stator core, and the second axial flow channel is arranged close to the geometric center of the stator core. The first axial flow channel is arranged close to the outer edge of the stator core, the second axial flow channel is arranged close to the outer edge of the stator core, the first axial flow channel is communicated with the first oil spraying opening, the second axial flow channel is communicated with the second oil spraying opening, the oil inlet channel is communicated with the first axial flow channel and the second axial flow channel, and one end of the oil inlet channel is an oil inlet end formed on the outer circumferential surface of the stator core. According to the scheme, cooling oil can flow into the first axial flow channel and the second axial flow channel respectively and then is sprayed to different layers of the winding structure through the first oil spraying opening and the second oil spraying opening, and the problem that in the prior art, cooling of a stator winding is not uniform is solved.

Description

Technical Field

[0001] The present invention relates to the field of stator structure design, and in particular to a stator core, a stator assembly, a motor and a vehicle. Background Art

[0002] The development of new energy vehicle drive motors toward high power density, miniaturization, and high speed is a key path to improving vehicle performance, extending driving range, and reducing manufacturing costs. High-power density and ultra-high-speed motors increase copper and iron losses exponentially, and miniaturization also reduces motor heat dissipation. Traditional axial cooling of the stator outer circle and spray cooling of the end windings have limited cooling effects on the inner windings within the stator slots and at the ends. Direct oil cooling of the windings within the stator slots limits the location of the spray nozzles at the ends, resulting in uneven cooling of the end windings and poor heat dissipation. Immersion cooling requires special sealing structures at the slots and winding ends, complicating the assembly process. Existing cooling technologies cannot uniformly cool both the straight winding sections and the winding ends simultaneously.

[0003] Currently, no effective solutions have been proposed for the above technical problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide a stator core, a stator assembly, a motor and a vehicle to solve the problem of uneven cooling of the stator winding in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a stator core is provided, wherein a first oil injection port and a second oil injection port are provided on the end surface of the stator core, and the stator core is provided with a first axial flow channel, a second axial flow channel and an oil inlet channel. The first axial flow channel and the second axial flow channel are both arranged to extend along the axial direction of the stator core, and the first axial flow channel is arranged near the geometric center of the stator core, and the second axial flow channel is arranged near the outer edge of the stator core, the first axial flow channel is connected to the first oil injection port, the second axial flow channel is connected to the second oil injection port, the oil inlet channel is connected to the first axial flow channel and the second axial flow channel, and one end of the oil inlet channel is an oil inlet end formed on the outer peripheral surface of the stator core.

[0006] Furthermore, the stator core is provided with stator slots, the first axial flow channel is arranged adjacent to the stator slots, and the first axial flow channel is arranged in communication with the stator slots.

[0007] Furthermore, there are multiple first axial flow channels, which are spaced apart along the circumference of the stator core, and / or there are multiple second axial flow channels, which are spaced apart along the circumference of the stator core.

[0008] Furthermore, the oil inlet channel includes an oil inlet groove and a radial oil inlet channel. The oil inlet groove is opened on the outer peripheral surface of the stator core, and the radial oil inlet channel extends along the radial direction of the stator core, wherein the first end of the radial oil inlet channel is connected to the oil inlet groove, the second end of the radial oil inlet channel is connected to the first axial flow channel, and the oil inlet groove is connected to the second axial flow channel.

[0009] Furthermore, the oil inlet groove is an annular groove extending along the circumference of the stator core.

[0010] Furthermore, the first axial flow channel includes a first injection section adjacent to the first injection port, and a first main section away from the first injection port, and the second axial flow channel includes a second injection section adjacent to the second injection port, and a second main section away from the second injection port, wherein at least one of the first injection section and the second injection section is a stepped structure.

[0011] Furthermore, the second main body section is connected to the second end of the radial oil inlet channel. Projected along the radial direction of the stator core, the radial oil inlet channel has a first cross-sectional area S1, and projected along the axial direction of the stator core, the second main body section has a second cross-sectional area S2, wherein S2≥2*S1.

[0012] Furthermore, the stator core includes a first punching sheet and a punching sheet group, there are two punching sheet groups, and the two punching sheet groups are respectively located at both ends of the first punching sheet, wherein the punching sheet group includes a second punching sheet, a third punching sheet, a fourth punching sheet and a fifth punching sheet arranged in sequence along a direction away from the first punching sheet, and the end of the fifth punching sheet away from the fourth punching sheet is provided with a first oil injection port and a second oil injection port.

[0013] Furthermore, the outer diameters of the first punch and the second punch are set to be the same, the outer diameters of the third punch, the fourth punch and the fifth punch are set to be the same, and the outer diameter of the first punch is smaller than the outer diameter of the third punch, so that an oil inlet groove is formed between the outer peripheral surface of the first punch, the outer peripheral surface of the second punch and the end face of the third punch.

[0014] Furthermore, the first punch, the second punch, and the third punch are all provided with a first axial flow section, and adjacent first axial flow sections are arranged corresponding to each other to form a first main section of the first axial flow channel, the fourth punch is provided with a first confluence groove, and the fifth punch is provided with a first oil injection hole, and the first confluence groove is connected to the first oil injection hole to form the first oil injection section of the first axial flow channel.

[0015] Furthermore, a second axial flow section is provided on the third punch, the second axial flow section is connected to the oil inlet groove, the second axial flow section forms the second main section of the second axial flow channel, the fourth punch is provided with a second confluence groove, and the fifth punch is provided with a second oil injection hole, the second confluence groove is connected to the second oil injection hole to form the second oil injection section of the second axial flow channel.

[0016] According to another aspect of the present invention, a stator assembly is provided. The stator assembly includes a stator core, and the stator core is the stator core described above.

[0017] Furthermore, the stator assembly also includes a stator winding, which includes two winding ends and a winding straight section. A winding end is provided at each end of the winding straight section, wherein the winding straight section is located in the stator slot of the stator core, and the winding end is located outside the stator core and is arranged close to the end of the stator core.

[0018] Furthermore, the stator assembly also includes a shell, which has a accommodating cavity, and the stator core is located in the accommodating cavity. The shell also has an oil inlet and an oil outlet, and the accommodating cavity is connected to the outside through the oil inlet and the oil outlet respectively.

[0019] According to another aspect of the present invention, a motor is provided. The motor has a stator assembly, and the stator assembly is the stator assembly described above.

[0020] According to another aspect of the present invention, a vehicle is provided. The vehicle has a motor, which is the motor described above.

[0021] By applying the technical solution of the present invention, the first axial flow channel is close to the geometric center of the stator core, which can effectively cool the winding structure located inside the stator core. The second axial flow channel is close to the outer edge of the stator core, which can effectively cool the surface of the stator core. The first oil nozzle is connected to the first axial flow channel, and the second oil nozzle is connected to the second axial flow channel. Such a layout allows the cooling oil to be sprayed from the inside and outside of the stator core respectively, uniformly cooling the winding structure at the end of the stator core. In this solution, the cooling oil can flow into the first axial flow channel and the second axial flow channel respectively through the oil inlet channel, and then be sprayed to different layers of the winding structure through the first oil nozzle and the second oil nozzle, realizing uniform cooling of the cooling oil at different parts of the winding, achieving the effect of comprehensive and uniform cooling, solving the problem of uneven cooling of the stator winding in the prior art, and improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 shows a structural schematic diagram of an embodiment of a stator assembly according to the present invention;

[0024] Figure 2 A schematic structural diagram of a stator core according to a first embodiment of the present invention is shown;

[0025] Figure 3shows a structural schematic diagram of a second embodiment of a stator core according to the present invention;

[0026] Figure 4 Shown Figure 3 A magnified schematic diagram of the P portion;

[0027] Figure 5 shows a schematic structural diagram of a third embodiment of a stator core according to the present invention;

[0028] Figure 6 A schematic structural diagram of an embodiment of a first punching sheet according to the present invention is shown;

[0029] Figure 7 A schematic structural diagram of an embodiment of a second punching sheet according to the present invention is shown;

[0030] Figure 8 A schematic structural diagram of an embodiment of a third punching sheet according to the present invention is shown;

[0031] Figure 9 shows a schematic structural diagram of an embodiment of a fourth punching sheet according to the present invention;

[0032] Figure 10 A schematic structural diagram of a first embodiment of a fifth punching sheet according to the present invention is shown;

[0033] Figure 11 A schematic structural diagram of a second embodiment of a fifth punching sheet according to the present invention is shown;

[0034] Figure 12 FIG. 1 is a schematic structural diagram of a stator core according to a fourth embodiment of the present invention.

[0035] The above drawings include the following reference numerals:

[0036] 1. Housing; 100. Accommodating chamber; 11. Oil inlet; 12. Oil outlet;

[0037] 2. Stator core;

[0038] 201, first fuel injection port; 202, second fuel injection port;

[0039] 203, first axial flow channel; 2031, first injection section; 2032, first main body section; 2033, first axial flow section;

[0040] 204, second axial flow channel; 2041, second injection section; 2042, second main body section; 2043, second axial flow section;

[0041] 205, oil inlet channel; 2051, oil inlet groove; 2052, radial oil inlet channel;

[0042] 206, stator slot;

[0043] 21. First punch; 22. Second punch; 23. Third punch;

[0044] 24, fourth punching plate; 241, first confluence groove; 242, second confluence groove;

[0045] 25, fifth punch; 251, first fuel injection hole; 252, second fuel injection hole;

[0046] 3. Stator winding; 31. Winding end; 32. Winding straight section. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0051] Combine Figures 1 to 12 As shown, according to a specific embodiment of the present application, a stator core is provided.

[0052] Specifically, a first oil injection port 201 and a second oil injection port 202 are provided on the end surface of the stator core, and a first axial flow channel 203, a second axial flow channel 204 and an oil inlet channel 205 are provided on the stator core. The first axial flow channel 203 and the second axial flow channel 204 are both arranged to extend along the axial direction of the stator core, and the first axial flow channel 203 is arranged close to the geometric center of the stator core, and the second axial flow channel 204 is arranged close to the outer edge of the stator core. The first axial flow channel 203 is connected to the first oil injection port 201, and the second axial flow channel 204 is connected to the second oil injection port 202. The oil inlet channel 205 is connected to the first axial flow channel 203 and the second axial flow channel 204, and one end of the oil inlet channel 205 is an oil inlet end formed on the outer peripheral surface of the stator core.

[0053] Using the technical solution of this embodiment, the first axial flow channel 203 is located near the geometric center of the stator core, effectively cooling the winding structure within the stator core. The second axial flow channel 204 is located near the outer edge of the stator core, effectively cooling the surface of the stator core. The first oil jet 201 is connected to the first axial flow channel 203, and the second oil jet 202 is connected to the second axial flow channel 204. This layout allows cooling oil to be sprayed from the inside and outside of the stator core, respectively, uniformly cooling the winding structure at the end of the stator core. In this solution, cooling oil can flow into the first axial flow channel 203 and the second axial flow channel 204 respectively through the oil inlet channel 205, and then be sprayed to different layers of the winding structure through the first oil jet 201 and the second oil jet 202, achieving uniform cooling of the cooling oil at different parts of the winding, achieving a comprehensive and uniform cooling effect, solving the problem of uneven cooling of the stator winding in the prior art, and improving cooling efficiency.

[0054] It should be understood that, in order to ensure a double-layer cooling effect at the end of the stator core, the first oil injection port 201 is provided at the teeth of the stator core, and the second oil injection port 202 is provided at the yoke of the stator core.

[0055] Furthermore, the stator core is provided with a stator slot 206 , the first axial flow channel 203 is arranged adjacent to the stator slot 206 , and the first axial flow channel 203 is arranged in communication with the stator slot 206 .

[0056] In this embodiment, the first axial flow channel 203 is connected to the stator slot 206, so that the cooling oil can directly pass through the stator winding structure in the stator slot 206 when flowing in the first axial flow channel 203, and the winding is directly cooled by the flow of cooling oil, thereby improving the cooling efficiency.

[0057] Preferably, the first axial flow channel 203 is adjacent to the stator slot 206 along the circumferential direction of the stator core and is communicated with the stator slot 206 .

[0058] Optionally, there are multiple first axial flow channels 203, which are spaced apart along the circumference of the stator core. The arrangement of multiple first axial flow channels 203 can increase the contact area between the cooling oil and the winding, thereby improving the cooling efficiency.

[0059] Preferably, when there are multiple first axial flow channels 203, there can also be multiple first oil injection ports 201, and the first oil injection ports 201 are arranged in a one-to-one correspondence with the first axial flow channels 203 to further improve the cooling efficiency of the winding structure located at the end of the stator core.

[0060] Optionally, multiple second axial flow channels 204 are provided, spaced apart along the circumference of the stator core. The provision of multiple second axial flow channels 204 can increase the contact area between the cooling oil and the stator core, improving the cooling effect. Furthermore, the multiple second axial flow channels 204 can increase the amount of oil supplied to the second oil injection port 202, thereby improving the cooling efficiency of the winding structure at the end of the stator core.

[0061] Preferably, when there are multiple second axial flow channels 204 , there can also be multiple second oil injection ports 202 , and the second oil injection ports 202 are arranged in a one-to-one correspondence with the second axial flow channels 204 to further improve the cooling efficiency of the winding structure at the end of the stator core.

[0062] It should be understood that the first axial flow channel 203 and the first fuel injection port 201 , and the second axial flow channel 204 and the second fuel injection port 202 may have various corresponding relationships other than one-to-one, such as many-to-one, one-to-many, many-to-many, etc.

[0063] Specifically, the oil inlet channel 205 includes an oil inlet groove 2051 and a radial oil inlet channel 2052. The oil inlet groove 2051 is opened on the outer peripheral surface of the stator core, and the radial oil inlet channel 2052 extends along the radial direction of the stator core, wherein the first end of the radial oil inlet channel 2052 is connected to the oil inlet groove 2051, the second end of the radial oil inlet channel 2052 is connected to the first axial flow channel 203, and the oil inlet groove 2051 is connected to the second axial flow channel 204.

[0064] In this embodiment, the opening of the oil inlet groove 2051 is the oil inlet end on the outer peripheral surface of the stator core. After the cooling oil enters the oil inlet groove 2051, a part of it enters the first axial flow channel 203 along the radial oil inlet channel 2052, and the other part enters the second axial flow channel 204. The radial oil inlet channel 2052 can be used as a cooling oil guide structure to realize the passage of cooling oil in the first axial flow channel 203, ensure that the cooling oil is evenly distributed in the first axial flow channel 203 and the second axial flow channel 204, and realize uniform cooling.

[0065] Among them, the oil inlet groove 2051 has multiple settings. For example, the oil inlet groove 2051 can be an arc-shaped groove arranged on the outer peripheral surface of the stator core, and the arc-shaped groove is connected to the radial oil inlet channel 2052 and the second axial flow channel 204. According to the setting position and setting number of the second axial flow channel 204 and the first axial flow channel 203, multiple corresponding radial oil inlet channels 2052 and oil inlet grooves 2051 can be set, or a larger oil inlet groove 2051 can be opened to simultaneously connect multiple second axial flow channels 204 and the first axial flow channel 203.

[0066] Preferably, the oil inlet groove 2051 is an annular groove extending along the circumference of the stator core. The annular groove can be connected to all second axial flow channels 204 and all first axial flow channels 203 at the same time. At the same time, the annular groove has a large flow area, which can increase the cooling oil flow rate and enhance the cooling effect.

[0067] Furthermore, the first axial flow channel 203 includes a first injection section 2031 adjacent to the first injection port 201 and a first main section 2032 distal to the first injection port 201. The second axial flow channel 204 includes a second injection section 2041 adjacent to the second injection port 202 and a second main section 2042 distal to the second injection port 202. At least one of the first injection section 2031 and the second injection section 2041 has a stepped structure. The stepped structure increases the flow resistance of the cooling oil in the injection section, improves the turbulence of the cooling oil, and thus enhances the cooling effect.

[0068] In this embodiment, either the first injection section 2031 or the second injection section 2041 can be configured as a stepped structure, or both can be configured as stepped structures. Preferably, the cross-sectional area of the stepped structure gradually decreases along the direction of oil spraying. Adjacent sections of the stepped structure can be eccentrically arranged or coaxially arranged.

[0069] Preferably, second main section 2042 is connected to the second end of radial oil inlet passage 2052. Projected along the radial direction of the stator core, radial oil inlet passage 2052 has a first cross-sectional area S1. Projected along the axial direction of the stator core, second main section 2042 has a second cross-sectional area S2, where S2 ≥ 2*S1. By controlling the cross-sectional area ratio between radial oil inlet passage 2052 and second main section 2042, the radial and axial flow velocities of the cooling oil can be maintained, thereby improving cooling efficiency.

[0070] like Figure 12 As shown, the cross section of the radial oil inlet channel 2052 has a diameter D and a length C, and the cross section of the second main body section 2042 has a length A and a width B, and A*B≥2*C*D, which can ensure that the double-layer flow channel can be filled with oil.

[0071] Specifically, if Figures 2 to 5 As shown, the stator core includes a first punching sheet 21 and a punching sheet group. There are two punching sheet groups, one at each end of the first punching sheet 21. The punching sheet group includes a second punching sheet 22, a third punching sheet 23, a fourth punching sheet 24, and a fifth punching sheet 25, which are arranged in sequence in a direction away from the first punching sheet 21. The end of the fifth punching sheet 25 away from the fourth punching sheet 24 is provided with a first oil injection port 201 and a second oil injection port 202. By laminating different punching sheets, a double layer of oil injection ports and a double layer of axial flow channels are formed, achieving three-dimensional cooling of the cooling oil and improving cooling efficiency.

[0072] It should be understood that in this embodiment, the punching groups on both sides of the first punching plate 21 are provided with a first fuel injection port 201 and a second fuel injection port 202. The punching plate structures involved below are all described by taking the punching plates in the same punching plate group as an example. In fact, the punching plate structures in the two punching plate groups are the same. The punching plate groups located on the same side of the first punching plate 21 are provided with a first fuel injection port 201, a second fuel injection port 202, a first axial flow channel 203, a second axial flow channel 204 and other structures.

[0073] Furthermore, the outer diameters of the first punch 21 and the second punch 22 are set to be the same, and the outer diameters of the third punch 23, the fourth punch 24, and the fifth punch 25 are set to be the same, and the outer diameter of the first punch 21 is smaller than the outer diameter of the third punch 23, so that an oil inlet groove 2051 is formed between the outer peripheral surface of the first punch 21, the outer peripheral surface of the second punch 22, and the end surface of the third punch 23. By stacking punches of different outer diameters to form the oil inlet groove 2051, uniform distribution of cooling oil can be achieved, thereby improving cooling efficiency.

[0074] Furthermore, the first punch 21, the second punch 22, and the third punch 23 are each provided with a first axial flow segment 2033, and adjacent first axial flow segments 2033 are arranged corresponding to each other to form a first main segment 2032 of the first axial flow channel 203. The fourth punch 24 is provided with a first confluence groove 241, and the fifth punch 25 is provided with a first oil injection hole 251. The first confluence groove 241 and the first oil injection hole 251 are arranged in communication to form the first oil injection segment 2031 of the first axial flow channel 203. By providing the first axial flow segments 2033, the first confluence groove 241, and the first oil injection hole 251 on different punches, the first axial flow channel 203 is formed, thereby achieving direct cooling of the winding structure inside the stator core by the cooling oil, thereby improving cooling efficiency.

[0075] Preferably, in this embodiment, a radial oil inlet channel 2052 is provided on the second punching sheet 22, and the first axial flow channels 203 formed by the punching sheet groups located on both sides of the first punching sheet 21 are mutually interconnected, that is, along the axial direction, after the coolant enters the oil inlet groove 2051, it can enter the first axial flow channel 203 through the radial oil inlet channel 2052, and then flow to the two end faces of the stator core in two opposite directions in the axial direction, thereby realizing synchronous cooling of the windings at both ends.

[0076] Furthermore, a second axial flow section 2043 is formed on the third punch 23, and the second axial flow section 2043 is connected to the oil inlet groove 2051. The second axial flow section 2043 forms the second main section 2042 of the second axial flow channel 204. The fourth punch 24 is formed with a second converging groove 242, and the fifth punch 25 is formed with a second oil injection hole 252. The second converging groove 242 and the second oil injection hole 252 are connected to form the second oil injection section 2041 of the second axial flow channel 204. By arranging the second axial flow sections 2043, the second converging groove 242, and the second oil injection hole 252 on different punches, the second axial flow channel 204 is formed, which can achieve cooling of the cooling oil on the outer surface of the stator core 2, thereby improving cooling efficiency.

[0077] In this embodiment, since punching groups are provided on both sides of the first punching plate 21, each punching group is provided with a second axial flow channel 204. When the coolant enters the oil inlet groove 2051, it can enter the two second axial flow channels 204 in opposite axial directions, and then flow to the two end faces of the stator core, thereby achieving synchronous cooling of the windings at both ends. Preferably, the second axial flow channels 204 on the two punching groups are symmetrically arranged.

[0078] According to another specific embodiment of the present application, a stator assembly is provided. The stator assembly includes a stator core, and the stator core is the stator core in the above embodiment.

[0079] By integrating the stator core in the above embodiment into the stator assembly, three-dimensional cooling of the stator winding can be achieved, making the winding cooling more uniform and improving the cooling efficiency.

[0080] Furthermore, the stator assembly also includes a stator winding 3, which includes two winding ends 31 and a winding straight section 32. A winding end 31 is provided at each end of the winding straight section 32, wherein the winding straight section 32 is located in the stator slot of the stator core, and the winding end 31 is located outside the stator core and is arranged close to the end of the stator core.

[0081] In this embodiment, the first axial flow channel 203 can directly cool the straight section 32 of the winding in the stator slot, the second axial flow channel 204 can realize the cooling of the stator core, and the cooling oil in the flow channel can be sprayed through the first oil spray hole 251 to realize the cooling of the inner layer structure of the winding end 31, and the cooling oil in the flow channel can be sprayed through the second oil spray hole 252 to realize the cooling of the outer layer structure of the winding end 31. This embodiment improves the cooling efficiency by three-dimensionally cooling the straight section 32 of the winding and the winding end 31.

[0082] Furthermore, if Figure 1 As shown, the stator assembly also includes a housing 1, which has a housing cavity 100. The stator core is located in the housing cavity 100. The housing 1 also has an oil inlet 11 and an oil outlet 12. The housing cavity 100 is connected to the outside through the oil inlet 11 and the oil outlet 12 respectively.

[0083] In this embodiment, the cooling oil enters the accommodating cavity 100 through the oil inlet 11 of the housing 1, cools various parts of the stator assembly through the flow channels and oil spray holes on the stator core, and is finally discharged through the oil outlet 12 of the housing 1, thereby realizing the circulation of the cooling oil and improving the cooling efficiency.

[0084] The present application also provides a preferred embodiment of a stator assembly.

[0085] like Figure 1 As shown, the stator assembly includes a housing 1, a stator core 2, and a stator winding 3. The housing 1 and stator core 2 are fixed by an interference fit. The multiple winding slots of the stator core 2 (i.e., the aforementioned stator slots 206) are used to fix the straight segments of the winding coils (i.e., the aforementioned winding straight segments 32). The multiple winding slots are arranged at intervals along the circumference of the stator core 2. The housing is provided with an oil inlet 11 and an oil outlet 12.

[0086] like Figure 2As shown, the stator winding 3 is divided into a winding end 31 and a winding straight section 32. The stator core is formed by stacking five types of punching sheets, including a first punching sheet 21, a second punching sheet 22, a third punching sheet 23, a fourth punching sheet 24, and a fifth punching sheet 25. The outer diameters of the first punching sheet 21 and the second punching sheet 22 are the same, and the outer diameter is the smallest. The outer diameters of the other three stator punching sheets are the same. The five types of punching sheets are stacked in order and in sequence along the axial direction.

[0087] Specifically, if Figure 6 As shown, the first punching sheet 21 is stacked to form an annular flow channel (ie, the aforementioned oil inlet groove 2051) and a first axial flow section 2033, as shown in FIG. Figure 7 As shown, the second punching sheet 22 is stacked to form a radial oil inlet channel 2052 and a first axial flow section 2033. The radial oil inlet channel 2052 is evenly distributed along the circumferential direction. Figure 8 As shown, the third punch 23 is stacked to form a first axial flow section 2033 and a second axial flow section 2043. The third punch 23 can also be stacked to form an axial stepped flow channel, which generates local turbulence through the steps to enhance the heat dissipation of the stator outer surface. The second axial flow section 2043 is arranged in a one-to-one correspondence with the radial oil inlet channel 2052, as shown in FIG. Figure 9 As shown, the fourth punching plate 24 is stacked to form a first confluence groove 241 located at the tooth portion and a second confluence groove 242 located at the yoke portion. The first confluence groove 241 and the second confluence groove 242 are not connected. The first confluence groove 241 is arranged in a one-to-one correspondence with the first axial flow section 2033, and the second confluence groove 242 is arranged in a one-to-one correspondence with the second axial flow section 2043. Figure 10 and Figure 11 As shown, the fifth punch 25 is stacked to form a first oil injection hole 251 located at the tooth portion and a second oil injection hole 252 located at the yoke portion. The confluence groove and the oil injection hole are in a one-to-one correspondence, wherein the oil injection hole of the fifth punch 25 can also be arranged in a stepped manner with the confluence groove of the fourth punch 24.

[0088] The first axial flow segments 2033 of the first, second, and third punches 21, 22, and 23 are connected, passing through the first confluence groove 241 and the first oil injection hole 251. The second axial flow segment 2043 of the third punch 23 passes through the second confluence groove 242 and the second oil injection hole 252, forming a double-layer, dual-spray cooling system. The first axial flow segment 2033 on each punch is connected to the winding slot to cool the winding straight section 32.

[0089] The cross-sectional area of the radial oil inlet channel 2052 does not exceed half of the cross-sectional area of the second axial flow section 2043, thereby ensuring that the second axial flow section 2043 and the first axial flow section 2033 are simultaneously filled with cooling oil. The shapes of the first oil injection hole 251 and the second oil injection hole 252 are not limited to circular (e.g. Figure 10 As shown), it can be square (as Figure 11As shown), elliptical, etc., the opening shape can be set according to needs.

[0090] like Figure 2 As shown, the second oil injection hole 252 of the fifth punch 25 and the bottom of the second confluence groove 242 are staggered in a stepped manner to ensure the direction of oil injection at the end; Figure 12 As shown, the relationship between the length A and width B of the second axial flow section 2043 and the length C and the pipe diameter D of the radial oil inlet channel 2052 is A*B≥2*C*D. This can ensure that the double-layer flow channel can be filled with oil. The specific dimensions of A, B, C, and D are designed according to the outer diameter of the stator and no specific requirements are made.

[0091] Among them, the cooling oil enters the annular flow channel through the oil inlet 11, filling the annular flow channel in the circumferential direction, filling the radial oil inlet channel 2052 in the radial direction, and filling the first axial flow section 2033 and the second axial flow section 2043 in the axial direction. The first axial flow section 2033 and the first confluence groove 241 and the first oil spray hole 251 are connected in series, and the cooling oil sprays the middle layer of the winding end 31. The second axial flow section 2043 and the second confluence groove 242 and the second oil spray hole 252 are connected in series, and the cooling oil sprays the outer layer of the winding.

[0092] The technical solution of this embodiment has the following beneficial effects: an annular flow channel, a radial oil inlet channel 2052 and an axial flow channel (including a first axial flow section 2033 and a second axial flow section 2043) are formed by laminating different stator punching sheets, and the annular flow channel, the radial oil inlet channel 2052 and the axial flow channel are used to guide the flow of cooling oil, which can three-dimensionally cool the stator and directly cool the straight section 32 of the winding, that is, the first axial flow section 2033 can cool the straight section 32 of the winding, and the second axial flow section 2043 can cool the stator. The double-layer axial flow channel has three-dimensional cooling and better cooling effect. The double-layer oil spray holes at the end (that is, the oil spray holes of the tooth part and the yoke part) guide the direction of cooling oil spraying. The double-layer spray end winding makes the end cooling more uniform, improves the cooling effect of the winding end 31, and thus improves the cooling efficiency of the electric drive. At the same time, the stator assembly in this embodiment does not require the use of seals, and is simpler to assemble, which can support the development of high power density, miniaturization and high speed of the electric drive.

[0093] According to another specific embodiment of the present application, a motor is provided. The motor has a stator assembly, and the stator assembly is the stator assembly in the above embodiment.

[0094] By integrating the stator assembly in the above embodiment into the motor, three-dimensional cooling of the motor winding can be achieved, the cooling efficiency can be improved, and the operating efficiency and reliability of the motor can be improved.

[0095] According to another specific embodiment of the present application, a vehicle is provided. The vehicle has a motor, and the motor is the motor in the above embodiment.

[0096] Integrating the motors described in the above embodiments into vehicles provides more uniform cooling of the vehicle's drive motor. Heat generated by the motor is effectively dissipated through the cooling system during driving, ensuring proper motor operation, improving vehicle performance and range, and enhancing operational efficiency and reliability. These vehicles can include new energy vehicles, particularly electric and hybrid vehicles, as well as other vehicles requiring high-power density, compact, and high-speed motors.

[0097] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0098] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0099] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0100] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stator core, characterized in that: A first oil injection port (201) and a second oil injection port (202) are provided on the end surface of the stator core. A first axial flow channel (203), a second axial flow channel (204) and an oil inlet channel (205) are provided on the stator core. The first axial flow channel (203) and the second axial flow channel (204) are both extended along the axial direction of the stator core. The first axial flow channel (203) is arranged close to the geometric center of the stator core, and the second axial flow channel (204) is arranged close to the outer edge of the stator core. The first axial flow channel (203) is connected to the first oil injection port (201), and the second axial flow channel (204) is connected to the second oil injection port (202). The oil inlet channel (205) is connected to the first axial flow channel (203) and the second axial flow channel (204), and one end of the oil inlet channel (205) is an oil inlet end formed on the outer peripheral surface of the stator core.

2. The stator core according to claim 1, characterized in that The stator core is provided with a stator slot (206), the first axial flow channel (203) is arranged adjacent to the stator slot (206), and the first axial flow channel (203) is arranged in communication with the stator slot (206).

3. The stator core according to claim 1 or 2, characterized in that: There are multiple first axial flow channels (203), and the multiple first axial flow channels (203) are arranged at intervals along the circumference of the stator core; and / or there are multiple second axial flow channels (204), and the multiple second axial flow channels (204) are arranged at intervals along the circumference of the stator core.

4. The stator core according to claim 3, characterized in that The oil inlet channel (205) comprises an oil inlet groove (2051) and a radial oil inlet channel (2052), wherein the oil inlet groove (2051) is provided on the outer peripheral surface of the stator core, and the radial oil inlet channel (2052) is extended along the radial direction of the stator core, wherein a first end of the radial oil inlet channel (2052) is communicated with the oil inlet groove (2051), a second end of the radial oil inlet channel (2052) is communicated with the first axial flow channel (203), and the oil inlet groove (2051) is communicated with the second axial flow channel (204).

5. The stator core according to claim 4, characterized in that The oil inlet groove (2051) is an annular groove extending along the circumference of the stator core.

6. The stator core according to claim 4, characterized in that The first axial flow channel (203) includes a first injection section (2031) adjacent to the first injection port (201), and a first main section (2032) away from the first injection port (201); the second axial flow channel (204) includes a second injection section (2041) adjacent to the second injection port (202), and a second main section (2042) away from the second injection port (202); wherein at least one of the first injection section (2031) and the second injection section (2041) is a stepped structure.

7. The stator core according to claim 6, characterized in that The second main body section (2042) is connected to the second end of the radial oil inlet channel (2052). When projected in the radial direction of the stator core, the radial oil inlet channel (2052) has a first cross-sectional area S1. When projected in the axial direction of the stator core, the second main body section (2042) has a second cross-sectional area S2, wherein S2 ≥ 2*S1.

8. The stator core according to claim 6, characterized in that The stator core comprises a first punching sheet (21) and a punching sheet group, wherein there are two punching sheet groups, and the two punching sheet groups are respectively located at two ends of the first punching sheet (21), wherein the punching sheet group comprises a second punching sheet (22), a third punching sheet (23), a fourth punching sheet (24) and a fifth punching sheet (25) sequentially arranged in a direction away from the first punching sheet (21), and the end of the fifth punching sheet (25) away from the fourth punching sheet (24) is provided with the first oil injection port (201) and the second oil injection port (202).

9. The stator core according to claim 8, characterized in that The outer diameters of the first punch (21) and the second punch (22) are set to be the same, the outer diameters of the third punch (23), the fourth punch (24) and the fifth punch (25) are set to be the same, and the outer diameter of the first punch (21) is smaller than the outer diameter of the third punch (23), so that the oil inlet groove (2051) is formed between the outer peripheral surface of the first punch (21), the outer peripheral surface of the second punch (22) and the end face of the third punch (23).

10. The stator core according to claim 8, characterized in that The first punch (21), the second punch (22), and the third punch (23) are all provided with a first axial flow section (2033), and adjacent first axial flow sections (2033) are arranged corresponding to each other to form the first main section (2032) of the first axial flow channel (203); the fourth punch (24) is provided with a first confluence groove (241), and the fifth punch (25) is provided with a first oil injection hole (251); the first confluence groove (241) and the first oil injection hole (251) are arranged in communication with each other to form the first oil injection section (2031) of the first axial flow channel (203).

11. The stator core according to claim 8, characterized in that The third punch (23) is provided with a second axial flow section (2043), the second axial flow section (2043) is connected to the oil inlet groove (2051), and the second axial flow section (2043) forms the second main section (2042) of the second axial flow channel (204). The fourth punch (24) is provided with a second confluence groove (242), and the fifth punch (25) is provided with a second oil injection hole (252), and the second confluence groove (242) is connected to the second oil injection hole (252) to form the second oil injection section (2041) of the second axial flow channel (204).

12. A stator assembly, characterized in that: The stator assembly includes a stator core, and the stator core is the stator core according to any one of claims 1 to 11.

13. The stator assembly according to claim 12, characterized in that: The stator assembly further comprises a stator winding (3), the stator winding (3) comprising two winding ends (31) and a winding straight section (32), one winding end (31) being provided at each end of the winding straight section (32), wherein the winding straight section (32) is located in a stator slot of the stator core, and the winding end (31) is located outside the stator core and is provided close to the end of the stator core.

14. The stator assembly according to claim 12, characterized in that: The stator assembly further comprises a housing (1), the housing (1) having an accommodating cavity (100), the stator core being located within the accommodating cavity (100), the housing (1) further comprising an oil inlet (11) and an oil outlet (12), the accommodating cavity (100) being in communication with the outside via the oil inlet (11) and the oil outlet (12), respectively.

15. A motor, characterized in that: The motor has a stator assembly, and the stator assembly is the stator assembly according to any one of claims 12 to 14.

16. A vehicle, characterized in that: The vehicle includes a motor, and the motor is the motor according to claim 15 .

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