Stator core, stator assembly, electric machine and vehicle

Abstract

The present disclosure relates to a kind of stator core, stator assembly, motor and vehicle, and the stator core includes core body, the core body is provided with liquid inlet channel and heat dissipation channel, the heat dissipation channel is communicated with the liquid inlet channel, the heat dissipation channel includes first channel and second channel, the inlet of first channel and the inlet of second channel are communicated with the liquid inlet channel, first outlet and second outlet are arranged at the end of the same end of the core body in the axial direction of the stator core, and the first outlet is arranged to be able to spray cooling liquid to the end of the coil winding in the axial direction of the stator core at a set angle.The stator core can guide the flow of cooling liquid, and the cooling liquid is sprayed out under a certain pressure, as far as possible to cover the distal end of coil winding, improve the overall cooling effect of coil winding.

Description

Technical Field

[0001] This disclosure relates to the field of electric motor technology, and more particularly to a stator core, stator assembly, electric motor, and vehicle. Background Technology

[0002] In related technologies, the stator assembly often focuses on cooling and heat dissipation of the stator core, but the cooling and heat dissipation effect on the coil winding is not ideal, which in turn affects the performance of the motor. Summary of the Invention

[0003] The purpose of this disclosure is to provide a stator core, stator assembly, motor, and vehicle to solve the problems in the aforementioned related technologies.

[0004] To achieve the above objectives, one aspect of this disclosure provides a stator core comprising: The iron core body is provided with a liquid inlet channel and a heat dissipation channel, the heat dissipation channel is connected to the liquid inlet channel, and the iron core body is provided with a wire groove for accommodating the coil winding. The heat dissipation channel includes a first channel and a second channel. The inlet of the first channel and the inlet of the second channel are both connected to the liquid inlet channel. The first channel has a first outlet and the second channel has a second outlet. The first outlet and the second outlet are located at the same end of the core body in the axial direction of the stator core, so that the coolant flowing out from the first channel and the second channel flows to the end of the coil winding in the axial direction of the stator core. The first outlet is configured to spray coolant at a set angle onto the end of the coil winding in the axial direction of the stator core.

[0005] In the above technical solution, by connecting the inlet of the first flow channel and the inlet of the second flow channel to the liquid inlet flow channel, the coolant in the liquid inlet flow channel simultaneously enters the first and second flow channels. The first and second flow channels are arranged in parallel, and the first and second outlets are both located at the ends of the iron core body. This allows the coolant to be guided to the ends of the coil winding along the axial direction of the stator iron core, achieving cooling and heat dissipation at the ends of the coil winding, thereby improving the cooling and heat dissipation effect at the ends of the coil winding and thus improving the overall cooling and heat dissipation effect of the coil winding. In addition, the first outlet is configured to spray the coolant at a set angle toward the ends of the coil winding, which can guide the coolant flow and thus target different positions at the ends of the coil winding for cooling and heat dissipation. Furthermore, the pressure of the coolant flowing out of the first outlet can be increased, so that the coolant is sprayed out under a certain pressure, covering as far as possible at the far end of the coil winding, improving the overall cooling and heat dissipation effect of the coil winding.

[0006] In some possible implementations, the core body includes a core portion; The core portion includes a first sub-port, which has a first opening extending through it along the axial direction of the stator core. The first opening is configured as a first flow channel.

[0007] This configuration facilitates the formation of a first flow channel, allowing the coolant to flow directly to the end of the coil winding.

[0008] In some possible implementations, the first sub-part includes a plurality of first laminations stacked in the axial direction of the stator core. Each first lamination is provided with a plurality of through holes, which are divided into a plurality of through hole groups arranged circumferentially. Adjacent first laminations are stacked in a staggered manner in the axial direction of the stator core so that the through holes of the adjacent first laminations are partially misaligned, and the adjacent first laminations mutually block a portion of the corresponding through holes. In particular, along the axial direction of the stator core, the area of ​​the overlapping portion of the through holes of the plurality of first laminations decreases sequentially and the radial position continuously approaches the end of the coil winding in the axial direction of the stator core.

[0009] By setting it up in this way, a portion of the through hole can be blocked, thereby changing the flow area of ​​the first opening. The reduced flow area increases the pressure of the coolant, allowing the coolant to be sprayed out at a set angle. In other words, a velocity gradient distribution of the coolant along the axial direction is achieved, resulting in a higher flow velocity and more precise spraying at the outlet. This ensures that the coolant can be sprayed deeper into the interior of the coil winding end, achieving an oblique oil spraying effect on the end of the coil winding. At the same time, it avoids spraying the coolant everywhere like a showerhead, concentrating the spray on the end of the coil winding.

[0010] In some possible implementations, the shapes and / or sizes of the plurality of through holes in each of the through hole groups of each of the first stacks are different; Each of the through-hole groups includes a first hole, a second hole, and a third hole of different shapes arranged sequentially along the circumference. The first hole and the third hole are arranged radially symmetrically about the first stack; The second hole includes a first sub-hole and a second sub-hole arranged radially symmetrically; The plurality of first stacked sheets include a first sub-sheet, a second sub-sheet, and a third sub-sheet, wherein the first hole of the first sub-sheet, the second hole of the second sub-sheet, and the third hole of the third sub-sheet partially overlap.

[0011] The aforementioned through-holes are symmetrically arranged. When the high-pressure coolant flows through this overlapping area and is finally ejected obliquely, the jet recoil forces generated by the two symmetrical through-holes are equal in magnitude and opposite in direction in the circumferential (tangential) direction. These two opposing tangential components completely cancel each other out, ensuring that the stator core does not bear any torsional moment in the circumferential direction, effectively avoiding the eccentric moment caused by a single hole, and ensuring the stability and reliability of the stator core. The first, second, and third sub-lamps can adopt the same structural design, achieving oblique jetting of coolant only by rotating relative to each other in the circumferential direction, reducing the types of first laminations forming the stator core. The coolant passes through a specific overlapping area of ​​the first hole of the first sub-lamp, the second hole of the second sub-lamp, and the third hole of the third sub-lamp, forming a precise oblique jet channel. In addition, during the process of obliquely ejecting outward along the axial direction, the solid structure of the first lamination near the outer layer partially blocks the through-holes of the first lamination near the inner layer, thus ensuring that the jetting is obliquely directed towards the end of the coil winding, rather than being a divergent jetting.

[0012] In some possible implementations, the first hole is a cross-shaped hole, the third hole is an I-shaped hole, and the first sub-hole and the second sub-hole are respectively imitation I-shaped holes; The horizontal portion of the cross-shaped hole, the tail portion of the imitation 1-shaped hole, and the lower horizontal portion of the I-shaped hole are connected to form an effective spray section.

[0013] By designing irregularly shaped holes such as cross-shaped holes, imitation I-shaped holes, and H-shaped holes, compared to conventionally shaped holes such as circular holes, the overlapping area of ​​multiple through holes is larger in the circumferential direction, resulting in a fan-shaped spray of coolant and a larger contact area with the ends of the coil windings. Simultaneously, the walls of the irregularly shaped holes can regulate the flow of coolant, allowing for better control of the coolant flow direction.

[0014] In some possible implementations, the cross-shaped hole of the first sub-plate is located between the two imitation I-shaped holes of the second sub-plate, and the overlapping portion of the horizontal part of the cross-shaped hole and the tail part of the imitation I-shaped hole is constructed as a square spray section; The overlapping portion of the I-shaped hole of the third sub-plate and the square spray section is a long strip spray section, which is approximately half the area of ​​the square spray section.

[0015] Through the above design, the overlapping area can be continuously reduced, and the radial position can be continuously moved closer to the end of the coil winding.

[0016] In some possible implementations, the through-hole satisfies at least one of the following conditions: The distance from the center of the through hole to the central axis of the iron core body is equal; The distance from the outer end of the through hole to the central axis of the iron core body is equal; The distance from the inner end of the through hole to the central axis of the iron core body is equal.

[0017] Therefore, the centers of multiple through holes are located at the same radial height, allowing punches and dies for stamping different through holes to be installed in the same position. This enables the reuse of parts in stamping dies, thereby reducing manufacturing costs. The outer boundaries of multiple through holes are located at the same radial height, and the inner boundaries of multiple through holes are also located at the same radial height, so that multiple first stacks can form jet channels through appropriate rotation.

[0018] In some possible implementations, in the radial direction of the stator core, the first outlet is closer to the outer peripheral wall of the core body than the second outlet, so that the coolant flowing from the first and second channels cools and dissipates heat at different locations at the ends of the coil windings in the axial direction of the stator core.

[0019] This arrangement allows the coolant to be sprayed along the first flow channel to the end of the coil winding in the axial direction of the stator core, and enables the second flow channel to cool and dissipate heat at different locations of the stator core and the coil winding.

[0020] In some possible implementations, the length of the coolant flow path in the first flow channel is less than the length of the coolant flow path in the second flow channel. The first flow channel is used to directly guide the coolant to the end of the coil winding in the axial direction of the stator core, and the second flow channel is used to guide the coolant to the core body and the slot. The coolant in the second flow channel can exchange heat with the core body and the portion of the coil winding located in the slot.

[0021] With this configuration, the paths of the first and second flow channels for guiding the coolant are in different positions, enabling simultaneous cooling and heat dissipation for both the stator core and the coil windings.

[0022] In some possible implementations, the liquid inlet channel is located near the end of the core body in the axial direction of the stator core. In the axial direction of the stator core, the inlet of the first channel and the inlet of the second channel are located on opposite sides of the liquid inlet channel. The inlet of the first channel is closer to the end of the core body in the axial direction of the stator core than the inlet of the second channel. The first channel extends along the axial direction of the stator core, and at least a portion of the second channel extends along the axial direction of the stator core.

[0023] This design allows the first flow channel to direct the coolant directly toward the end of the coil winding, shortening the flow path and improving the cooling effect on the end of the coil winding.

[0024] In some possible implementations, the second flow channel includes a first sub-flow channel, a second sub-flow channel, a third sub-flow channel, and a fourth sub-flow channel; The first sub-channel is connected to the liquid inlet channel, and one end of the fourth sub-channel is located at the end of the core body in the axial direction of the stator core to guide the coolant out of the core body. The second sub-channel is connected to the first sub-channel and the third sub-channel respectively, and the third sub-channel is connected to the fourth sub-channel. In the radial direction of the core body, the first sub-channel is close to the outer peripheral wall of the core body, and the coolant in the first sub-channel is used for heat exchange with the core body. The third sub-channel is close to the slot and communicates with the slot, and the coolant in the third sub-channel is used for heat exchange with the portion of the coil winding located in the slot.

[0025] This configuration facilitates cooling of the stator core and the portion of the coil winding located in the slot, increasing heat exchange time and area, and improving cooling efficiency.

[0026] In some possible implementations, both the first sub-channel and the third sub-channel extend along the axial direction of the stator core, and the coolant in the first sub-channel flows in the opposite direction to the coolant in the third sub-channel. At least a portion of the second sub-channel and the fourth sub-channel extend along the radial direction of the stator core.

[0027] This configuration allows the coolant to flow a sufficiently long distance in the first and third sub-channels, enabling heat exchange with the core and coil windings.

[0028] In some possible implementations, there are two sets of heat dissipation channels, which are arranged opposite to each other in the axial direction of the stator core. The second sub-channels of both sets of heat dissipation channels are close to the middle of the core body in the axial direction of the stator core, and the second sub-channels of the two sets of heat dissipation channels are interconnected.

[0029] This configuration increases the flow rate of coolant in the stator core, thereby increasing the heat exchange area.

[0030] In some possible implementations, the core body includes a core portion; The core portion includes a first sub-part, a second sub-part, and a third sub-part stacked in the axial direction of the stator core. The second sub-part is located between the first sub-part and the third sub-part. The outer diameter of the second sub-part is smaller than the outer diameters of the first sub-part and the third sub-part, so that the second sub-part, the first sub-part, and the third sub-part surround and form a groove. The groove is used to cooperate with the outer shell to form the liquid inlet channel. The first flow channel is disposed in the first sub-section, and different parts of the second flow channel are respectively disposed in the first sub-section, the second sub-section, and the third sub-section.

[0031] This design facilitates the formation of an inlet channel, eliminating the need for separate manufacturing and reducing costs.

[0032] In some possible implementations, the second flow channel includes a first sub-flow channel, and the third sub-section includes a plurality of third laminations stacked in the axial direction of the stator core. Each third lamination is provided with a second opening, and the second openings of the plurality of third laminations are interconnected to form the first sub-flow channel.

[0033] This configuration facilitates the formation of the first sub-channel for coolant flow.

[0034] In some possible implementations, the core portion further includes a fourth sub-portion connected to the end of the third sub-portion opposite to the first sub-portion, and the second flow channel includes a first sub-flow channel and a second sub-flow channel, the second sub-flow channel being disposed in the fourth sub-portion; The second sub-channel includes a third opening formed on the fourth sub-part, the fourth sub-part having a slot formed thereon, and the third opening communicating with the slot and the first sub-channel.

[0035] This setup facilitates the formation of a second sub-channel, enabling the connection between the first and third sub-channels.

[0036] In some possible implementations, the second flow channel includes a third sub-flow channel, and the core portion further includes a fourth sub-portion. The second sub-portion, the third sub-portion, and the fourth sub-portion are all provided with slots, and the side edges of the slots of the second sub-portion, the third sub-portion, and the fourth sub-portion are all provided with notches. The notches of the second sub-portion, the third sub-portion, and the fourth sub-portion are interconnected to form the third sub-flow channel.

[0037] This configuration facilitates the formation of a third sub-channel, guiding the coolant to the wire groove for cooling and heat dissipation of the coil winding.

[0038] In some possible implementations, the second flow channel includes a third sub-flow channel and a fourth sub-flow channel, and the first sub-section is provided with a fourth opening that penetrates the first sub-section along the axial direction of the stator core; The second sub-section is provided with a fifth port that penetrates the second sub-section along the axial direction of the stator core. The fifth port is connected to the third sub-channel. The fourth port is connected to the fifth port. The fourth port and the fifth port together form the fourth sub-channel.

[0039] This configuration facilitates the formation of a fourth sub-channel for coolant flow.

[0040] In some possible implementations, the number of core portions is two sets, and the two sets of core portions are stacked in the axial direction of the stator core. Each set of core portions also includes a fourth sub-part, and the fourth sub-parts of the two sets of core portions are interconnected. The first sub-section, the second sub-section, the third sub-section, and the fourth sub-section of the two sets of iron cores are all provided with slots and are interconnected to form the wire groove.

[0041] This configuration increases the length of the stator core and facilitates the introduction of coolant to cool the two sets of core sections, thereby improving the cooling effect of the stator core.

[0042] In some possible implementations, the number of slots in the two fourth sub-parts is multiple, and the multiple slots are spaced apart around the axis of the stator core. The fourth sub-parts are formed with a third opening, and the third opening is provided on both sides of each slot in every two adjacent slots of each fourth sub-part. The two fourth sub-parts are staggered and stacked in the axial direction of the stator core, so that the slot in one fourth sub-part with the third opening is opposite to and connected to the slot in the other fourth sub-part without the third opening; A portion of the third port of one of the fourth sub-parts is connected to a portion of the third port of another fourth sub-part.

[0043] This configuration allows coolant to be introduced into each slot, which is beneficial for cooling and heat dissipation of the coil windings.

[0044] A second aspect of this disclosure also provides a stator assembly, including coil windings and the aforementioned stator core; The coil winding is wound on the core body of the stator core, and part of the coil winding is placed in the slot of the core body.

[0045] The above technical solution can improve the cooling and heat dissipation effect of the entire stator assembly, thereby improving the performance of the motor.

[0046] In some possible implementations, the stator assembly further includes an insulating element connected to the coil winding and disposed within the wire slot; The insulating component includes insulating paper that covers the coil winding. A groove is provided at a portion of the insulating paper, and the groove is positioned opposite to the third sub-channel of the second flow channel of the iron core body; or... The insulating component includes two insulating portions, which are disposed at both ends of the slot in the axial direction of the stator core, so that a portion of the coil winding in the slot is in direct contact with the coolant in the third sub-channel of the second flow channel of the core body.

[0047] This configuration ensures that the heat exchange between the coolant and the coil windings is not affected.

[0048] A third aspect of this disclosure also provides an electric motor including the stator core described above, or including the stator assembly described above.

[0049] The fourth aspect of this disclosure also provides a vehicle that includes the stator core described above, or the stator assembly described above, or the motor described above.

[0050] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0051] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the assembly relationship between the stator core and the coil winding according to one embodiment of the present disclosure.

[0052] Figure 2 This is an exploded view of the assembly relationship of the stator core, coil windings and insulating components according to one embodiment of this disclosure.

[0053] Figure 3 This is an exploded view of the assembly relationship of the stator core, coil windings and insulation components according to another embodiment of this disclosure.

[0054] Figure 4 This is an exploded schematic diagram of a stator core according to one embodiment of the present disclosure.

[0055] Figure 5 This is a schematic diagram of the structure of the first sub-part of one embodiment of this disclosure.

[0056] Figure 6 yes Figure 5 An enlarged view of position A in the middle.

[0057] Figure 7 This is a schematic diagram of the structure of the first sub-piece according to one embodiment of this disclosure.

[0058] Figure 8 yes Figure 7 An enlarged view of position B in the middle.

[0059] Figure 9 This is a schematic cross-sectional view of a plurality of first stacked sheets according to one embodiment of the present disclosure.

[0060] Figure 10 This is a schematic diagram of the formation of a square spray section according to one embodiment of the present disclosure.

[0061] Figure 11 This is a schematic diagram of the formation of an elongated spray section according to one embodiment of the present disclosure.

[0062] Figure 12 This is a schematic diagram of the effective spray section formation according to one embodiment of the present disclosure.

[0063] Figure 13 This is a schematic diagram of the coolant flow direction in the first flow channel according to an embodiment of the present disclosure, wherein the arrow indicates the coolant flow direction.

[0064] Figure 14 This is a schematic diagram of the structure of the second sub-part of one embodiment of this disclosure.

[0065] Figure 15 yes Figure 14 An enlarged diagram of position C in the middle.

[0066] Figure 16 This is a schematic diagram of the structure of the third sub-part of one embodiment of this disclosure.

[0067] Figure 17 yes Figure 16 An enlarged diagram of position D in the middle.

[0068] Figure 18 This is a schematic diagram of the structure of the fourth sub-part of one embodiment of this disclosure.

[0069] Figure 19 yes Figure 18 An enlarged diagram of position E in the middle.

[0070] Figure 20 This is a schematic diagram of the structure of two fourth sub-parts stacked in one embodiment of the present disclosure.

[0071] Figure 21 yesFigure 20 An enlarged diagram of position F in the middle.

[0072] Figure 22 This is a schematic diagram of the assembly relationship between the coil winding and the slot according to one embodiment of the present disclosure.

[0073] Figure 23 yes Figure 22 Enlarged diagram of position G in the middle.

[0074] Figure 24 This is a schematic diagram of the heat dissipation channel according to one embodiment of the present disclosure, wherein the arrow indicates the flow direction of the coolant.

[0075] Figure 25 This is a structural diagram showing the relationship between the first flow channel, the first sub-flow channel, and the liquid inlet flow channel according to one embodiment of this disclosure, wherein the arrows indicate the flow direction of the coolant.

[0076] Explanation of reference numerals in the attached figures 1. Core body; 11. Core section; 111. First sub-section; 112. Second sub-section; 113. Third sub-section; 114. Fourth sub-section; 2. Liquid inlet channel; 21. Groove; 3. Heat dissipation flow channel; 31. First flow channel; 311. First outlet; 32. Second flow channel; 321. First sub-flow channel; 322. Second sub-flow channel; 323. Third sub-flow channel; 324. Fourth sub-flow channel; 325. Second outlet; 4. Cable trough; 41. Groove opening; 42. Notch; 5. Coil winding; 61. First bite; 62. Second bite; 63. Third bite; 64. Fourth bite; 65. Fifth bite; 7. Insulating components; 8. Through hole; 81. First hole; 811. Horizontal part; 82. Second hole; 821. First sub-hole; 822. Second sub-hole; 823. Tail part; 83. Third hole; 831. Lower horizontal part; 9. First stack of pieces; 91. First sub-piece; 92. Second sub-piece; 93. Third sub-piece; 10. Effective spray section, A1. Square spray section, A2. Long strip spray section. Detailed Implementation

[0077] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0078] In this disclosure, unless otherwise stated, "inner" and "outer" refer to the inner and outer parts of the relevant components. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0079] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0080] The electric motor is a core component of the drive system in new energy vehicles. Its cooling performance directly determines its performance ceiling under high load conditions, especially the cooling of the stator assembly. Currently, the mainstream cooling method is to dissipate heat from the stator assembly using coolant.

[0081] In related technologies, the stator assembly often focuses primarily on cooling the stator core, with less effective cooling of the coil windings, thus affecting the performance of the resulting motor. Specifically, in these technologies, the coolant exchanges heat with the stator core to remove heat, while the heat from the coil windings is transferred to the coolant through the stator core. The ends of the coil windings cannot effectively dissipate heat, resulting in ineffective cooling of the coil windings.

[0082] Therefore, such as Figures 1-25 As shown, one aspect of this disclosure provides a stator core, including a core body 1.

[0083] The core body 1 is provided with a liquid inlet channel 2 and a heat dissipation channel 3, which are connected to the liquid inlet channel 2. The core body 1 is also provided with a groove 4 for accommodating the coil winding 5. It can be understood that coolant flows from the outside into the liquid inlet channel 2, then flows through the liquid inlet channel 2 to the heat dissipation channel 3, where it is guided by the heat dissipation channel 3. The groove 4 can fix the coil winding 5, thus securing it to the core body 1. The coolant can be cooling oil.

[0084] The heat dissipation channel 3 includes a first channel 31 and a second channel 32. The inlet of the first channel 31 and the inlet of the second channel 32 are both connected to the liquid inlet channel 2. The first channel 31 has a first outlet 311 and the second channel 32 has a second outlet 325. The first outlet 311 and the second outlet 325 are located at the same end of the iron core body 1 in the axial direction of the stator iron core, so that the coolant flowing out from the first channel 31 and the second channel 32 flows to the end of the coil winding 5 in the axial direction of the stator iron core.

[0085] The first outlet 311 is configured to spray coolant at a set angle to the end of the coil winding 5 in the axial direction of the stator core.

[0086] In the above technical solution, by connecting the inlet of the first flow channel 31 and the inlet of the second flow channel 32 to the liquid inlet flow channel 2, the coolant in the liquid inlet flow channel 2 simultaneously enters the first flow channel 31 and the second flow channel 32. The first flow channel 31 and the second flow channel 32 are arranged in parallel, and the first outlet 311 and the second outlet 325 are both located at the end of the iron core body 1. Thus, the coolant can be guided to the end of the coil winding 5 in the axial direction of the stator iron core, thereby achieving cooling and heat dissipation at the end position of the coil winding 5, thereby improving the cooling and heat dissipation effect at the end of the coil winding 5, and further improving the cooling and heat dissipation effect of the entire coil winding 5. In addition, the first outlet 311 is configured to spray coolant at a set angle toward the end of the coil winding 5, which can guide the coolant flow and thus cool and dissipate heat at different positions at the end of the coil winding 5. In addition, it can increase the pressure of the coolant flowing out of the first outlet 311, so that the coolant is sprayed out under a certain pressure, covering the far end of the coil winding 5 as much as possible, thereby improving the overall cooling and heat dissipation effect of the coil winding 5.

[0087] Optionally, in one embodiment of this disclosure, the number of first outlets 311 can be multiple, and the flow areas of the multiple first outlets 311 are different, thereby realizing the pressurization and guiding effect of coolant, realizing spraying, and also realizing the spraying of coolant at a set angle.

[0088] Optionally, in one embodiment of this disclosure, the core body 1 includes a core portion 11. The core portion 11 includes a first sub-port 111, and the first sub-port 111 is provided with a first opening 61 extending through the first sub-port 111 along the axial direction of the stator core. The first opening 61 is configured as a first flow channel 31. It is understood that the end of the first opening 61 is the first outlet 311, from which coolant can flow out, thereby guiding the coolant to the end of the coil winding 5.

[0089] By partially blocking the first opening 61, the flow area of ​​the first opening 61 can be changed, thereby increasing the pressure of the coolant when it flows in the first opening 61. Due to the partial blocking, the flow direction is changed, which can change the angle at which the coolant flows out of the first opening 61, so as to achieve spraying at a set angle.

[0090] Optionally, in one embodiment of this disclosure, the first sub-part 111 includes a plurality of first laminations 9 stacked along the axial direction of the stator core. Each first lamination 9 is provided with a plurality of through holes 8, which are divided into multiple groups of through holes arranged circumferentially. Adjacent first laminations 9 are staggered along the axial direction of the stator core, so that the through holes 8 of adjacent first laminations 9 are partially misaligned, and adjacent first laminations 9 partially block the corresponding through holes 8. By such arrangement, a portion of the through holes 8 can be blocked, thereby changing the flow area of ​​the first opening 61. With the design of the blocking position, the angle at which the coolant flows out of the first opening 61 can be adjusted. After blocking, the flow area of ​​the first opening 61 decreases, the pressure of the coolant increases, and the coolant can be sprayed out.

[0091] It is understandable that the structures of multiple first laminations 9 can be identical. When multiple first laminations 9 are stacked in the axial direction of the stator core, adjacent first laminations 9 are misaligned at a certain angle, and the through holes 8 of adjacent first laminations 9 are partially misaligned. That is to say, a part of the through hole 8 of one first lamination 9 is connected to a part of the through hole 8 of the other first lamination 9. One first lamination 9 can block a part of the through hole 8 of the other first lamination 9, thereby reducing the flow area and increasing the pressure of the coolant.

[0092] In this configuration, along the axial direction of the stator core, the area of ​​the overlapping portions of the through holes in the multiple first laminations 9 decreases sequentially, and their radial positions continuously approach the end of the coil winding 5 along the axial direction of the stator core. This achieves a velocity gradient distribution of the coolant along the axial direction, resulting in a higher flow velocity and more precise spraying at the outlet. This ensures that the coolant can be sprayed deeper into the interior of the end of the coil winding 5, achieving an oblique spraying effect on the end of the coil winding 5. Simultaneously, it avoids spraying the coolant everywhere like a showerhead, concentrating the spray towards the end of the coil winding 5.

[0093] Optionally, in one embodiment of this disclosure, at least some of the through holes 8 in each first lamination 9 have different shapes and / or sizes. By designing different shapes and / or sizes for the through holes 8, the through holes 8 of two adjacent first laminations 9 are misaligned, which facilitates the partial blocking of the through holes 8 between adjacent first laminations 9, and helps to reduce the flow area and design the spray angle of the coolant.

[0094] In some examples, each first lamination 9 has multiple through holes 8, which are spaced apart around the axis of the stator core. Each through hole 8 may include multiple sub-holes of different shapes and / or sizes. This allows the multiple sub-holes of each through hole 8 to be staggered when two adjacent first laminations 9 are stacked, thus changing the flow area of ​​the sub-holes. In some examples, there are four sub-holes, spaced apart, and their shapes can be cross-shaped, strip-shaped, I-shaped, etc.

[0095] Optionally, in one embodiment of this disclosure, each through-hole group includes a first hole 81, a second hole 82, and a third hole 83 of different shapes arranged sequentially along the circumference.

[0096] The first hole 81 and the third hole 83 are arranged radially symmetrically about the first stack 9.

[0097] The second hole 82 includes a first sub-hole 821 and a second sub-hole 822 arranged radially symmetrically.

[0098] The plurality of first stacked sheets 9 include a first sub-sheet 91, a second sub-sheet 92 and a third sub-sheet 93, wherein the first hole 81 of the first sub-sheet 91, the second hole 82 of the second sub-sheet 92 and the third hole 83 of the third sub-sheet 93 partially overlap.

[0099] The aforementioned multiple through holes 8 are symmetrically arranged. When the high-pressure coolant flows through the overlapping area and is finally ejected obliquely, the jet recoil force generated by the two symmetrical through holes 8 is equal in magnitude and opposite in direction in the circumferential (tangential) direction. These two opposite tangential components completely cancel each other out, so that the stator core does not bear any torsional moment in the circumferential direction, effectively avoiding the eccentric moment caused by a single hole, and ensuring the stability and reliability of the stator core.

[0100] The first lamination 91, the second lamination 92, and the third lamination 93 can adopt the same structural design, achieving inclined spraying of coolant only by relative rotation in the circumferential direction, thus reducing the types of first laminations 9 forming the stator core. The coolant passes through a specific overlapping area of ​​the first hole 81 of the first lamination 91, the second hole 82 of the second lamination 92, and the third hole 83 of the third lamination 93, forming a precise inclined spray channel. Furthermore, during the axial outward inclined spraying, a portion of the solid structure near the outer layer of the first lamination 9 partially blocks the through-holes 8 near the inner layer of the first lamination 9, ensuring that the spray is inclined towards the end of the coil winding 5, rather than a divergent spray.

[0101] Optionally, in one embodiment of this disclosure, the first hole 81 is a cross-shaped hole, the third hole 83 is an I-shaped hole, and the first sub-hole 821 and the second sub-hole 822 are respectively imitation I-shaped holes.

[0102] The horizontal portion 811 of the cross-shaped hole, the tail portion 823 of the imitation 1-shaped hole, and the lower horizontal portion 831 of the I-shaped hole are connected to form an effective spraying portion 10.

[0103] By designing irregularly shaped holes such as cross-shaped holes, imitation I-shaped holes, and I-shaped holes, compared to conventionally shaped holes, such as circular holes, the overlapping area of ​​multiple through holes 8 is larger in the circumferential direction, resulting in a fan-shaped spray of coolant and a larger contact area with the end of the coil winding 5. Simultaneously, the hole walls of the irregularly shaped holes can regulate the flow of coolant, better controlling its flow direction. The shape and size of the parts of the cross-shaped holes, imitation I-shaped holes, and I-shaped holes, excluding those forming the effective spray section 10, can be designed as needed, and this disclosure does not impose limitations.

[0104] In addition, in this embodiment, the outer and inner ends of the imitation 1-shaped hole are respectively provided with protruding sections. The purpose is to ensure that the distances from the outer and inner ends of the multiple through holes 8 described below to the central axis of the iron core body 1 are equal. The shape of the protruding sections can be appropriately adjusted.

[0105] Reference Figure 10 , Figure 10 This is a schematic diagram illustrating the formation of a square injection section A1 according to an exemplary embodiment; in Figure 10 In the diagram, the outline of the second hole 82 is represented by a dashed line, and the outline of the first hole 81 is represented by a solid line. Figure 10 In the middle, the position of the square spray section A1 is filled with shadow. Optionally, in one embodiment of this disclosure, the cross-shaped hole of the first sub-plate 91 is located between the two imitation 1-shaped holes of the second sub-plate 92, and the overlapping part of the horizontal part 811 of the cross-shaped hole and the tail part 823 of the imitation 1-shaped hole is constructed as the square spray section A1.

[0106] Reference Figure 11 , Figure 11 This is a schematic diagram illustrating the formation of the elongated spray section A2 according to an exemplary embodiment; in Figure 11 In the diagram, the outline of the second hole 82 is represented by a dashed line, a partial outline of the first hole 81 is represented by a solid line, and the third hole 83 is represented by a dotted-dash line. Figure 11 In the diagram, the positions of the elongated jet section A2 and the effective jet section 10 formed therein are filled with shadows. In this disclosure, the elongated jet section A2 is equivalent to the effective jet section 10.

[0107] In some examples, the overlapping portion of the I-shaped hole of the third sub-plate 93 and the square spray section A1 is a long strip spray section A2, which is approximately half the area of ​​the square spray section A1. The shapes of the square spray section A1 and the long strip spray section A2 are related to the shape design of the through hole 8. Through the above design, the overlapping area can be continuously reduced, and the radial position can be continuously moved closer to the end of the coil winding 5.

[0108] Furthermore, for the outermost third sub-plate 93, in a group of through holes, the effective spray section 10 is formed only at the position of the H-shaped hole. Although a square spray section A1 can be formed with the second sub-plate 92 at the position of the pseudo-I-shaped hole, it will be blocked by the solid structure of the first sub-plate 91. The final effective spray section 10 is... Figure 11 and Figure 12 The shaded area is shown. Because the through holes 8 of the three sub-plates partially overlap axially, a stepped contraction flow channel is formed, with the flow cross-sectional area gradually decreasing from the first hole 81 to the third hole 83. As the coolant flows through this overlapping area, the flow velocity gradually increases with the decrease in flow area, resulting in the coolant ultimately sprayed onto the end of the coil winding 5 having higher impact kinetic energy and being sprayed in a single direction towards the end of the coil winding 5.

[0109] Alternatively, in one embodiment of this disclosure, the through hole 8 satisfies at least one of the following conditions: The distance from the center of the through hole 8 to the central axis of the iron core body 1 is equal.

[0110] The distance from the outer end of the through hole 8 to the central axis of the iron core body 1 is equal.

[0111] The distance from the inner end of the through hole 8 to the central axis of the iron core body 1 is equal.

[0112] Therefore, the centers of the multiple through holes 8 are located at the same radial height, and the punches and dies for stamping different through holes 8 can be installed in the same position, enabling the reuse of parts in the stamping die and thus reducing manufacturing costs. The outer boundaries of the multiple through holes 8 are located at the same radial height, and the inner boundaries of the multiple through holes 8 are located at the same radial height, so that multiple first stacked sheets 9 can form jet channels through appropriate rotation. Here, "inner end" and "outer end" refer to the radial direction, with the side closer to the inner peripheral wall of the iron core body 1 being the inner end and the side farther from the inner peripheral wall of the iron core body 1 being the outer end.

[0113] Optionally, in one embodiment of this disclosure, the coolant inlet channel 2 is located near the end of the core body 1 along the axial direction of the stator core. Along the axial direction of the stator core, the inlets of the first channel 31 and the second channel 32 are located on opposite sides of the coolant inlet channel 2. The length of the coolant flow path in the first channel 31 is shorter than the length of the coolant flow path in the second channel 32. The first channel 31 is used to directly guide the coolant to the end of the coil winding 5 along the axial direction of the stator core, and the second channel 32 is used to guide the coolant to the core body 1 and the slot 4, so that the coolant in the second channel 32 can exchange heat with the portion of the core body 1 and the coil winding 5 located in the slot 4. With this arrangement, the locations of the coolant flow paths in the first channel 31 and the second channel 32 are different, enabling simultaneous cooling and heat dissipation for both the stator core and the coil winding 5.

[0114] The inlet channel 2 is located near the end of the core body 1 along the axial direction of the stator core. The inlet of the first channel 31 is located on one side of the inlet channel 2. Thus, the coolant can be directly guided to the end of the coil winding 5 along the axial direction of the stator core under the action of the first channel 31. This shortens the length of the first channel 31, thereby shortening the path length of the coolant to the end of the coil winding 5 along the axial direction of the stator core and improving the heat exchange efficiency of the end of the coil winding 5 along the axial direction of the stator core.

[0115] The second flow channel 32 is located on the other side of the inlet flow channel 2. The second flow channel 32 guides the coolant to the core body 1 and the slot 4, providing cooling for the portion of the core body 1 and the coil winding 5 located in the slot 4. The coolant is then guided to the end of the coil winding 5 along the axial direction of the stator core. The long flow path of the coolant in the second flow channel 32 allows for cooling of multiple locations on the stator core and coil winding 5, thus improving the overall cooling effect. Furthermore, the coolant is within the slot 4, enabling direct heat exchange between the coolant and the coil winding 5 without the need for the core body 1, thereby improving heat exchange efficiency and enhancing the cooling effect on the coil winding 5.

[0116] Therefore, the coolant in the first flow channel 31 and the second flow channel 32 serves different purposes for cooling and heat dissipation. The first flow channel 31 can directly guide the coolant to the end of the coil winding 5 along the axial direction of the stator core, thereby cooling and dissipating heat at the end of the coil winding 5 along the axial direction of the stator core. The second flow channel 32 can guide the coolant to the core body 1 and the slot 4, thereby cooling and dissipating heat at the portion of the core body 1 and the coil winding 5 located in the slot 4. In addition, the second flow channel 32 can also guide the coolant to the end of the coil winding 5 along the axial direction of the stator core, thereby cooling and dissipating heat at the end of the coil winding 5 along the axial direction of the stator core.

[0117] Optionally, in one embodiment of this disclosure, the first flow channel 31 extends along the axial direction of the stator core, and at least a portion of the second flow channel 32 extends along the axial direction of the stator core. By extending the first flow channel 31 along the axial direction of the stator core, it is advantageous for the coolant to be sprayed along the first flow channel 31 to the end of the coil winding 5 in the axial direction of the stator core. Furthermore, the extension of at least a portion of the second flow channel 32 along the axial direction of the stator core increases the flow path length of the coolant in the second flow channel 32, thereby increasing the heat exchange area and heat exchange time, and ultimately improving heat exchange efficiency.

[0118] In this configuration, in the radial direction of the stator core, the first outlet 311 is closer to the outer peripheral wall of the core body 1 than the second outlet 325. This allows the coolant flowing from the first flow channel 31 and the second flow channel 32 to cool and dissipate heat at different positions on the ends of the coil winding 5 along the axial direction of the stator core. This arrangement ensures that the coolant flows out from different positions at the first outlet 311 and the second outlet 325, thus guiding it to different positions on the coil winding 5 and improving the cooling and heat dissipation effect at these different positions on the ends of the coil winding 5 along the axial direction of the stator core.

[0119] Optionally, in one embodiment of this disclosure, the second flow channel 32 includes a first sub-flow channel 321, a second sub-flow channel 322, a third sub-flow channel 323, and a fourth sub-flow channel 324.

[0120] The first sub-channel 321 is connected to the inlet channel 2. One end of the fourth sub-channel 324 is located at the end of the core body 1 along the axial direction of the stator core, guiding the coolant out of the core body 1. The second sub-channel 322 is connected to both the first sub-channel 321 and the third sub-channel 323, and the third sub-channel 323 is connected to the fourth sub-channel 324. The coolant in the inlet channel 2 can flow into the first sub-channel 321, thus introducing the coolant. The fourth sub-channel 324 is used for coolant outflow, guiding the coolant to the end of the coil winding 5 along the axial direction of the stator core, improving the cooling effect on the coil winding 5. The coolant in the first sub-channel 321 can flow through the second sub-channel 322 to the third sub-channel 323, achieving overall coolant flow.

[0121] In this design, the coolant in the first sub-channel 321 flows in the opposite direction to the coolant in the third sub-channel 323. As a result, the coolant in the second sub-channel 32 flows in a reverse direction, which increases the residence time of the coolant in the first sub-channel 321 and the third sub-channel 323 in the stator core and the slot 4, thereby increasing the heat exchange time and heat exchange area and improving the cooling effect.

[0122] Optionally, in one embodiment of this disclosure, the first sub-flow channel 321 and the third sub-flow channel 323 both extend along the axial direction of the stator core, and at least a portion of the second sub-flow channel 322 and the fourth sub-flow channel 324 extend along the radial direction of the stator core.

[0123] The first sub-channel 321 and the third sub-channel 323 both extend along the axial direction of the stator core, which can increase the length of the first sub-channel 321 and the third sub-channel 323, so that the coolant can flow a sufficiently long distance in the first sub-channel 321 and the third sub-channel 323 to achieve heat exchange with the core body 1 and the coil winding 5.

[0124] The second sub-channel 322 can guide the coolant along the radial direction of the stator core, so that the coolant can flow from the first sub-channel 321 to the third sub-channel 323.

[0125] In the radial direction of the core body 1, the first sub-flow channel 321 is close to the outer peripheral wall of the core body 1, and the third sub-flow channel 323 is close to and connected to the slot 4. By placing the first sub-flow channel 321 close to the outer peripheral wall of the core body 1, cooling and heat dissipation can be achieved at the location of the outer peripheral wall of the core body 1, that is, the interference surface of the core body 1, thereby improving the cooling and heat dissipation effect on the stator core.

[0126] Understandably, the coolant in the single heat dissipation channel 3 flows from the end of the core body 1, and under the action of the first channel 31, flows along the axial direction of the core body 1, sprays out from one end of the core body 1, and flows towards the end of the coil winding 5 along the axial direction of the stator core. Under the action of the first sub-channel 321 of the second channel 32, it flows along the axial direction of the core body 1, towards the middle of the core body 1, and then flows through the second sub-channel 322 to the third sub-channel 323, where it exchanges heat with the coil winding 5. Under the action of the third sub-channel 323, the coolant flows along the axial direction of the core body 1, towards the end of the core body 1, and then flows through the third sub-channel 323 to the fourth sub-channel 324, and is guided through the fourth sub-channel 324 to the end of the coil winding 5, where it cools and dissipates heat.

[0127] Optionally, in one embodiment of this disclosure, the number of heat dissipation channels 3 is two sets, which are arranged opposite to each other along the axial direction of the stator core. The second sub-channels 322 of both sets of heat dissipation channels 3 are located close to the center of the core body 1 along the axial direction of the stator core. By providing two sets of heat dissipation channels 3, the flow rate of coolant in the stator core can be increased, thereby increasing the heat exchange area. This allows for heat exchange with different areas of the stator core and coil windings 5, improving heat exchange efficiency and thus enhancing the overall cooling effect. This, in turn, improves the cooling effect on the constructed stator assembly and enhances the performance of the constructed motor. The number of first channels 31 and second channels 32 in both sets of heat dissipation channels 3 are multiple.

[0128] There are two inlet channels 2, located at opposite ends of the stator core 1 along its axial direction. Each inlet channel 2 connects to one of the two sets of heat dissipation channels 3. The second channels 32 of the two sets of heat dissipation channels 3 can be interconnected or not, depending on the requirements. The flow directions of the coolant in the two sets of heat dissipation channels 3 are mirror images. In some examples, the second sub-channels 322 of the two sets of heat dissipation channels 3 are interconnected. This means that the coolant introduced by the two inlet channels 2 flows along the first sub-channels 321 of the two sets of heat dissipation channels 3, then flows to the second sub-channels 322, where they converge, and then flow to the third sub-channel 323.

[0129] Alternatively, in one embodiment of this disclosure, the core body 1 includes a core portion 11.

[0130] The core portion 11 includes a first sub-portion 111, a second sub-portion 112, and a third sub-portion 113 stacked along the axial direction of the stator core. The second sub-portion 112 is located between the first sub-portion 111 and the third sub-portion 113. The outer diameter of the second sub-portion 112 is smaller than the outer diameters of the first sub-portion 111 and the third sub-portion 113, so that the second sub-portion 112, the first sub-portion 111, and the third sub-portion 113 surround and form a groove 21. The groove 21 is used to cooperate with the outer casing to form a liquid inlet channel 2. Therefore, it is convenient to form the liquid inlet channel 2 without the need for separate manufacturing, which can reduce costs.

[0131] Understandably, the second sub-part 112 is located between the first sub-part 111 and the third sub-part 113. Since the outer diameter of the second sub-part 112 is smaller than the outer diameters of the first sub-part 111 and the third sub-part 113, a concave groove 21 exists between them. The bottom of the groove 21 is the outer peripheral wall of the second sub-part 112, and the groove wall is the end face of the first sub-part 111 and the third sub-part 113. When the entire stator core is assembled into the housing, the housing closes the opening 41 of the groove 21, forming a closed space, which in turn forms the liquid inlet channel 2, allowing coolant to flow. The housing can be provided with a liquid inlet, which communicates with the groove 21, allowing coolant to flow from the outside into the liquid inlet channel 2.

[0132] The first flow channel 31 is disposed in the first sub-section 111, and different parts of the second flow channel 32 are disposed in the first sub-section 111, the second sub-section 112, and the third sub-section 113, respectively. It can be understood that the first flow channel 31 can directly guide the coolant to the end of the coil winding 5, while the coolant in the second flow channel 32 can flow in the first sub-section 111, the second sub-section 112, and the third sub-section 113 to achieve heat exchange.

[0133] Optionally, in one embodiment of this disclosure, the second flow channel 32 includes a first sub-flow channel 321, and the third sub-section 113 includes a plurality of third laminations stacked in the axial direction of the stator core. Each third lamination is provided with a second opening 62, and the second openings 62 of the plurality of third laminations are interconnected to form the first sub-flow channel 321. This facilitates the formation of the first sub-flow channel 321 and allows the coolant in the first sub-flow channel 321 to flow within the third sub-section 113, achieving direct contact with the third sub-section 113 and thus facilitating heat exchange.

[0134] It is understood that each third lamination is provided with a second opening 62, which penetrates the corresponding third lamination along the axial direction of the stator core. Thus, when multiple third laminations are stacked, the second openings 62 of the multiple third laminations are opposite each other in the axial direction of the stator core, thereby realizing the connection of the second openings 62 of the multiple third laminations, and thus forming a first sub-channel 321 extending along the axial direction of the stator core.

[0135] In some examples, each third lamination has multiple second ports 62, which are spaced apart around the axis of the stator core. The multiple second ports 62 of the multiple third laminations are connected to form multiple first sub-channels 321, which are spaced apart around the axis of the stator core.

[0136] Optionally, in one embodiment of this disclosure, the core portion 11 further includes a fourth sub-portion 114, which is connected to the end of the third sub-portion 113 opposite to the first sub-portion 111. The second flow channel 32 includes a second sub-flow channel 322, which is disposed on the fourth sub-portion 114. It is understood that the first sub-portion 111, the second sub-portion 112, the third sub-portion 113, and the fourth sub-portion 114 are stacked sequentially.

[0137] The second sub-channel 322 includes a third opening 63 formed on the fourth sub-section 114. The fourth sub-section 114 has a slot 41 formed thereon, and the third opening 63 communicates with the slot 41 and the first sub-channel 321. The third opening 63 enables flow between the slot 41 and the first sub-channel 321, thereby allowing the coolant in the first sub-channel 321 to flow to the third sub-channel 323.

[0138] The third port 63 on the fourth sub-section 114 is opposite to the second port 62 on at least part of the third lamination, so that the third port 63 and the second port 62 can be connected to realize the flow of coolant, which also realizes the connection between the first sub-channel 321 and the second sub-channel 322, thereby guiding the coolant of the first sub-channel 321 to the slot 41.

[0139] The fourth sub-section 114 may include a fourth lamination, on which a third opening 63 is formed, extending through the axis of the stator core. The number of fourth laminations may be one or more, stacked together.

[0140] Optionally, in one embodiment of this disclosure, the second flow channel 32 includes a third sub-flow channel 323, and the core portion 11 further includes a fourth sub-portion 114. The second sub-portion 112, the third sub-portion 113, and the fourth sub-portion 114 are all provided with slots 41, and the side edges of the slots 41 of the second sub-portion 112, the third sub-portion 113, and the fourth sub-portion 114 are all provided with notches 42. The notches 42 of the second sub-portion 112, the third sub-portion 113, and the fourth sub-portion 114 are interconnected to form the third sub-flow channel 323. This arrangement facilitates the formation of the third sub-flow channel 323, guiding the coolant into the wire groove 4.

[0141] The slots 41 of the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 are connected in the axial direction of the stator core. Thus, when the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 are stacked, the slots 41 of the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 are arranged opposite each other, thereby achieving communication and forming part of the wire groove 4 for winding the coil winding 5.

[0142] In this design, the side edges of the slots 41 of the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 are recessed to form notches 42. In other words, the notches 42 are extensions of the slots 41 of the second sub-part 112, the third sub-part 113, and the fourth sub-part 114, increasing the width of the slots 41 in the circumferential direction of the stator core. Thus, when the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 are stacked, the notches 42 of the second sub-part 112, the third sub-part 113, and the fourth sub-part 114 can communicate with each other to form a third sub-flow channel 323, thereby realizing the flow of coolant.

[0143] It is understandable that the side edge of the slot 41 of the first sub-section 111 does not form a notch 42, so that the first sub-section 111 can produce a blocking effect in the axial direction of the stator core, so that the coolant can flow to the fourth sub-channel 324.

[0144] The second sub-part 112, the third sub-part 113 and the fourth sub-part 114 each have multiple slots 41, which are spaced apart around the axis of the stator core, thus forming multiple wire grooves 4, which are spaced apart around the axis of the stator core.

[0145] The second sub-section 112 may include one second lamination, or multiple second laminations stacked together. The third sub-section 113 serves as a magnetic conductor, and the fourth sub-section 114 serves to guide and distribute the coolant.

[0146] Optionally, in one embodiment of this disclosure, notches 42 are provided on both sides of the slot 41 of the second sub-section 112, the third sub-section 113, and the fourth sub-section 114. Thus, each side of a single slot has a third sub-channel 323.

[0147] Optionally, in one embodiment of this disclosure, the second flow channel 32 includes a fourth sub-flow channel 324, and the first sub-part 111 is provided with a fourth opening 64 that penetrates the first sub-part 111 along the axial direction of the stator core.

[0148] The second sub-section 112 is provided with a fifth port 65 that extends through the second sub-section 112 along the axis of the stator core. The fifth port 65 is connected to the third sub-channel 323, and the fourth port 64 is connected to the fifth port 65. The fourth port 64 and the fifth port 65 together form the fourth sub-channel 324. This arrangement facilitates the formation of the fourth sub-channel 324.

[0149] The fifth opening 65 communicates with the notch 42 on the side of the slot 41 of the second sub-section 112, thereby connecting the third sub-flow channel 323 with the fifth opening 65, allowing the coolant in the third sub-flow channel 323 to flow to the fourth sub-flow channel 324. The fifth opening 65 can extend radially along the stator core. In some examples, a fifth opening 65 is provided on both sides of each slot 41 of the second sub-section 112, and communicates with the notches 42 on both sides of the corresponding slot 41.

[0150] The fourth slot 64 is multiple in number and is distributed at intervals around the axis of the stator core. Each fourth slot 64 can correspond to and be connected to a fifth slot 65. The fourth slot 64 is closer to the axis of the stator core than the first slot 61. The fourth slot 64 is located on one side of the corresponding slot 41 in the radial direction of the stator core, thereby not affecting the electromagnetic performance and being electromagnetically friendly.

[0151] Optionally, in one embodiment of this disclosure, the number of core portions 11 is two sets, and the two sets of core portions 11 are stacked in the axial direction of the stator core. Each set of core portions 11 also includes a fourth sub-part 114, and the fourth sub-parts 114 of the two sets of core portions 11 are interconnected.

[0152] In this design, the first sub-section 111, the second sub-section 112, the third sub-section 113, and the fourth sub-section 114 of the two sets of core sections 11 are each provided with a slot 41. The slots 41 of the first sub-section 111, the second sub-section 112, the third sub-section 113, and the fourth sub-section 114 are interconnected to form a wire groove 4. This arrangement increases the length of the stator core and facilitates the introduction of coolant to cool the two sets of core sections 11, thereby improving the cooling effect of the stator core.

[0153] It is understandable that both sets of core sections 11 have heat dissipation channels 3. The two sets of heat dissipation channels 3 can be interconnected or not interconnected, and the coolant flows independently. If the two sets of heat dissipation channels 3 are interconnected, the third ports 63 of the two fourth sub-sections 114 can be arranged opposite each other to achieve communication. If the two sets of heat dissipation channels 3 are not interconnected, the third ports 63 of the two fourth sub-sections 114 are not arranged opposite each other and are not interconnected.

[0154] Optionally, in one embodiment of this disclosure, the number of slots 41 in the two fourth sub-parts 114 is multiple, and the multiple slots 41 are distributed at intervals around the axis of the stator core. The fourth sub-parts 114 are formed with third openings 63, and a third opening 63 is provided on both sides of each slot 41 in every two adjacent slots 41 of each fourth sub-part 114.

[0155] In this configuration, two fourth sub-sections 114 are staggered and stacked along the axial direction of the stator core, such that the slot 41 in one fourth sub-section 114 with a third opening 63 is opposite to and connected to the slot 41 in the other fourth sub-section 114 without a third opening 63. This reduces the number of third openings 63 on the fourth sub-sections 114, thereby ensuring the structural strength of the fourth sub-sections 114 and allowing coolant to be introduced into each slot 4. Furthermore, it enables the staggered arrangement of two sets of heat dissipation channels 3, facilitating cooling of different locations on the stator core and coil windings 5.

[0156] In some examples, two fourth sub-parts 114 are staggered and stacked in the axial direction of the stator core, so that the slot 41 with the third opening 63 in one fourth sub-part 114 is opposite to and connected with the slot 41 without the third opening 63 in the other fourth sub-part 114. The third opening 63 of one fourth sub-part 114 can be connected to the third opening 63 of the other fourth sub-part 114, so that the two sets of heat dissipation channels 3 can be connected.

[0157] In this case, a portion of the third port 63 of one fourth sub-section 114 is connected to a portion of the third port 63 of another fourth sub-section 114, thereby enabling the second sub-channels 322 of the two sets of heat dissipation channels 3 to be connected, and realizing the convergence of the coolant in the two sets of heat dissipation channels 3.

[0158] A second aspect of this disclosure also provides a stator assembly including a coil winding 5 and the aforementioned stator core.

[0159] The coil winding 5 is wound on the core body 1 of the stator core, and part of the coil winding 5 is placed in the slot 4 of the core body 1.

[0160] Optionally, in one embodiment of this disclosure, the stator assembly further includes an insulating member 7, which is connected to the coil winding 5 and disposed within the wire slot 4. The insulating member 7 provides insulation.

[0161] In some examples, the insulating element 7 includes insulating paper that covers the coil winding 5. A groove 21 is provided at a portion of the insulating paper, and the groove 21 is positioned opposite to the third sub-channel 323 of the second flow channel 32 of the core body 1. The groove 21 ensures that the formation of the third sub-channel 323 is not affected, thus guaranteeing the flow of coolant and facilitating heat exchange between the coolant and the portion of the coil winding 5 located in the slot 4.

[0162] In some other examples, the insulating element 7 includes two insulating portions disposed at the two end slots 41 of the slot 4 along the axial direction of the stator core, so that a portion of the coil winding 5 in the slot 4 can directly contact the coolant in the third sub-channel 323 of the second channel 32 of the core body 1. This arrangement exposes a portion of the coil winding 5 in the slot 4, allowing it to directly contact the coolant in the third sub-channel 323 and achieve heat exchange.

[0163] Alternatively, in other examples, the insulating element 7 includes insulating paper that covers the coil winding 5 and has openings for coolant flow, allowing the coolant to directly contact the coil winding 5 for heat exchange.

[0164] Optionally, in one embodiment of this disclosure, the insulating member 7 may be partially foamed in the slot 41 of the wire groove 4 in the axial direction of the stator core, thereby creating a sealing effect and sealing the gap between the slot 41 of the wire groove 4 in the axial direction of the stator core and the coil winding 5.

[0165] Optionally, in one embodiment of this disclosure, the insulating member 7 is insulating paper. The circumferential edges of both ends of the insulating member 7 along the axial direction of the stator assembly are configured to be foamed and form foamed portions. A portion of the insulating member extending along the axial direction of the stator assembly is also configured to be foamed and form foamed portions, causing a portion of the insulating member to bulge. The outer wall of this portion of the insulating member is connected to the stator core, and the inner wall of this portion of the insulating member is connected to the coil winding. This configuration creates a sealing effect while avoiding obstruction of the opening, ensuring contact between the coolant and the coil winding, and preventing coolant leakage. It is understood that the foamed portions can be annular or strip-shaped. The foamed portions can exert a pushing effect on the coil winding, fixing the coil winding within the slot and preventing coil winding movement, while also creating a sealing effect.

[0166] A third aspect of this disclosure also provides an electric motor, including the stator core described above, or including the stator assembly described above. The motor includes a housing, within which the stator core can be assembled. The housing may be provided with a liquid inlet.

[0167] The fourth aspect of this disclosure also provides a vehicle that includes the stator core described above, or the stator assembly described above, or the motor described above.

[0168] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0169] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0170] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A stator core, characterized in that, include: The iron core body is provided with a liquid inlet channel and a heat dissipation channel, the heat dissipation channel is connected to the liquid inlet channel, and the iron core body is provided with a wire groove for accommodating the coil winding. The heat dissipation channel includes a first channel and a second channel. The inlet of the first channel and the inlet of the second channel are both connected to the liquid inlet channel. The first channel has a first outlet and the second channel has a second outlet. The first outlet and the second outlet are located at the same end of the core body in the axial direction of the stator core, so that the coolant flowing out from the first channel and the second channel flows to the end of the coil winding in the axial direction of the stator core. The first outlet is configured to spray coolant at a set angle onto the end of the coil winding in the axial direction of the stator core.

2. The stator core according to claim 1, characterized in that, The core body includes a core section; The core portion includes a first sub-port, which has a first opening extending through it along the axial direction of the stator core. The first opening is configured as a first flow channel.

3. The stator core according to claim 2, characterized in that, The first sub-part includes a plurality of first laminations, which are stacked in the axial direction of the stator core. Each first lamination is provided with a plurality of through holes, which are divided into a plurality of through hole groups arranged at intervals along the circumference. Two adjacent first laminations are stacked in a staggered manner in the axial direction of the stator core so that the through holes of the two adjacent first laminations are partially misaligned, and the two adjacent first laminations mutually block a portion of the corresponding through holes. In particular, along the axial direction of the stator core, the area of ​​the overlapping portion of the through holes of the plurality of first laminations decreases sequentially and the radial position continuously approaches the end of the coil winding in the axial direction of the stator core.

4. The stator core according to claim 3, characterized in that, The shapes and / or sizes of the plurality of through holes in each of the through hole groups of each of the first stacks are different; Each of the through-hole groups includes a first hole, a second hole, and a third hole of different shapes arranged sequentially along the circumference. The first hole and the third hole are arranged radially symmetrically about the first stack; The second hole includes a first sub-hole and a second sub-hole arranged radially symmetrically; The plurality of first stacked sheets include a first sub-sheet, a second sub-sheet, and a third sub-sheet, wherein the first hole of the first sub-sheet, the second hole of the second sub-sheet, and the third hole of the third sub-sheet partially overlap.

5. The stator core according to claim 4, characterized in that, The first hole is a cross-shaped hole, the third hole is an H-shaped hole, and the first sub-hole and the second sub-hole are respectively imitation I-shaped holes; The horizontal portion of the cross-shaped hole, the tail portion of the imitation 1-shaped hole, and the lower horizontal portion of the I-shaped hole are connected to form an effective spray section.

6. The stator core according to claim 5, characterized in that, The cross-shaped hole of the first sub-plate is located between the two imitation 1-shaped holes of the second sub-plate, and the overlapping part of the horizontal part of the cross-shaped hole and the tail part of the imitation 1-shaped hole is constructed as a square spray part; The overlapping portion of the I-shaped hole of the third sub-plate and the square spray section is a long strip spray section, which is approximately half the area of ​​the square spray section.

7. The stator core according to claim 3, characterized in that, The through hole satisfies at least one of the following conditions: The distance from the center of the through hole to the central axis of the iron core body is equal; The distance from the outer end of the through hole to the central axis of the iron core body is equal; The distance from the inner end of the through hole to the central axis of the iron core body is equal.

8. The stator core according to claim 1, characterized in that, In the radial direction of the stator core, the first outlet is closer to the outer peripheral wall of the core body than the second outlet, so that the coolant flowing out from the first and second channels can cool and dissipate heat at different positions of the coil winding at the ends of the stator core in the axial direction.

9. The stator core according to claim 1, characterized in that, The length of the coolant flow path in the first flow channel is less than the length of the coolant flow path in the second flow channel; The first flow channel is used to directly guide the coolant to the end of the coil winding in the axial direction of the stator core, and the second flow channel is used to guide the coolant to the core body and the slot. The coolant in the second flow channel can exchange heat with the core body and the portion of the coil winding located in the slot.

10. The stator core according to claim 1, characterized in that, The liquid inlet channel is located near the end of the core body in the axial direction of the stator core. In the axial direction of the stator core, the inlet of the first channel and the inlet of the second channel are located on opposite sides of the liquid inlet channel. The inlet of the first channel is closer to the end of the core body in the axial direction of the stator core than the inlet of the second channel. The first channel extends along the axial direction of the stator core, and at least a portion of the second channel extends along the axial direction of the stator core.

11. The stator core according to claim 7, characterized in that, The second flow channel includes a first sub-flow channel, a second sub-flow channel, a third sub-flow channel, and a fourth sub-flow channel; The first sub-channel is connected to the liquid inlet channel, and one end of the fourth sub-channel is located at the end of the core body in the axial direction of the stator core to guide the coolant out of the core body. The second sub-channel is connected to the first sub-channel and the third sub-channel respectively, and the third sub-channel is connected to the fourth sub-channel. In the radial direction of the core body, the first sub-channel is close to the outer peripheral wall of the core body, and the coolant in the first sub-channel is used for heat exchange with the core body. The third sub-channel is close to the slot and communicates with the slot, and the coolant in the third sub-channel is used for heat exchange with the portion of the coil winding located in the slot.

12. The stator core according to claim 11, characterized in that, Both the first sub-channel and the third sub-channel extend along the axial direction of the stator core, and the coolant in the first sub-channel flows in the opposite direction to the coolant in the third sub-channel. At least a portion of the second sub-channel and the fourth sub-channel extend along the radial direction of the stator core.

13. The stator core according to claim 12, characterized in that, The number of heat dissipation channels is two sets, and the two sets of heat dissipation channels are arranged opposite each other in the axial direction of the stator core. The second sub-channels of the two sets of heat dissipation channels are close to the middle of the core body in the axial direction of the stator core, and the second sub-channels of the two sets of heat dissipation channels are interconnected.

14. The stator core according to claim 1, characterized in that, The core body includes a core section; The core portion includes a first sub-part, a second sub-part, and a third sub-part stacked in the axial direction of the stator core. The second sub-part is located between the first sub-part and the third sub-part. The outer diameter of the second sub-part is smaller than the outer diameters of the first sub-part and the third sub-part, so that the second sub-part, the first sub-part, and the third sub-part surround and form a groove. The groove is used to cooperate with the outer shell to form the liquid inlet channel. The first flow channel is disposed in the first sub-section, and different parts of the second flow channel are respectively disposed in the first sub-section, the second sub-section, and the third sub-section.

15. The stator core according to claim 14, characterized in that, The second flow channel includes a first sub-flow channel, and the third sub-section includes a plurality of third laminations, which are stacked in the axial direction of the stator core. Each third lamination is provided with a second opening, and the second openings of the plurality of third laminations are interconnected to form the first sub-flow channel.

16. The stator core according to claim 14, characterized in that, The core portion further includes a fourth sub-portion, which is connected to the end of the third sub-portion away from the first sub-portion. The second flow channel includes a first sub-flow channel and a second sub-flow channel, which is disposed in the fourth sub-portion. The second sub-channel includes a third opening formed on the fourth sub-part, the fourth sub-part having a slot formed thereon, and the third opening communicating with the slot and the first sub-channel.

17. The stator core according to claim 14, characterized in that, The second flow channel includes a third sub-flow channel, and the iron core portion also includes a fourth sub-portion. The second sub-portion, the third sub-portion, and the fourth sub-portion are all provided with slots. The side edges of the slots of the second sub-portion, the third sub-portion, and the fourth sub-portion are all provided with notches. The notches of the second sub-portion, the third sub-portion, and the fourth sub-portion are interconnected to form the third sub-flow channel.

18. The stator core according to claim 14, characterized in that, The second flow channel includes a third sub-flow channel and a fourth sub-flow channel, and the first sub-section is provided with a fourth opening that penetrates the first sub-section along the axial direction of the stator core; The second sub-section is provided with a fifth port that penetrates the second sub-section along the axial direction of the stator core. The fifth port is connected to the third sub-channel. The fourth port is connected to the fifth port. The fourth port and the fifth port together form the fourth sub-channel.

19. The stator core according to claim 14, characterized in that, The number of iron core parts is two sets, and the two sets of iron core parts are stacked in the axial direction of the stator iron core. Each set of iron core parts also includes a fourth sub-part, and the fourth sub-parts of the two sets of iron core parts are connected to each other. The first sub-section, the second sub-section, the third sub-section, and the fourth sub-section of the two sets of iron cores are all provided with slots and are interconnected to form the wire groove.

20. The stator core according to claim 19, characterized in that, The number of slots in the two fourth sub-parts is multiple, and the multiple slots are distributed at intervals around the axis of the stator core. The fourth sub-parts are formed with a third opening, and the third opening is provided on both sides of each slot in every two adjacent slots of each fourth sub-part. The two fourth sub-parts are staggered and stacked in the axial direction of the stator core, so that the slot in one fourth sub-part with the third opening is opposite to and connected to the slot in the other fourth sub-part without the third opening; A portion of the third port of one of the fourth sub-parts is connected to a portion of the third port of another fourth sub-part.

21. A stator assembly, characterized in that, Includes coil windings and a stator core as described in any one of claims 1-20; The coil winding is wound on the core body of the stator core, and part of the coil winding is placed in the slot of the core body.

22. The stator assembly according to claim 21, characterized in that, The stator assembly further includes an insulating component connected to the coil winding and disposed within the wire slot; The insulating component includes insulating paper that covers the coil winding. A groove is provided at a portion of the insulating paper, and the groove is positioned opposite to the third sub-channel of the second flow channel of the iron core body; or... The insulating component includes two insulating portions, which are disposed at both ends of the slot in the axial direction of the stator core, so that a portion of the coil winding in the slot is in direct contact with the coolant in the third sub-channel of the second flow channel of the core body.

23. An electric motor, characterized in that, It includes a stator core as described in any one of claims 1-20, or a stator assembly as described in claim 21 or 22.

24. A vehicle, characterized in that, It includes a stator core as described in any one of claims 1-20, or a stator assembly as described in claims 21 or 22, or a motor as described in claim 23.

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