Stator core

Abstract

The utility model discloses a stator core which comprises a body part and end parts, the outer wall of the body part is provided with a first cooling flow channel, and the end parts are connected to the two sides of the body part in the axial direction of the stator core and provided with a plurality of second cooling flow channels which extend in the axial direction and are distributed in the circumferential direction of the stator core at intervals. The second cooling flow channel at least comprises a first channel, a second channel and a third channel, the first channel is communicated with the first cooling flow channel, the third channel is communicated with the end face of the stator core, the first channel is communicated with the third channel through the second channel, and projections of the first channel and the second channel are at least partially overlapped; the projection of the second channel and the projection of the third channel are at least partially overlapped, and the projection of the first channel and the projection of the third channel are not overlapped, so that the spraying range of the cooling liquid is expanded, the cooling liquid flowing out of the second cooling flow channel can cool the stator winding and can also cover the end face of the stator iron core, and the cooling efficiency is improved. Therefore, the end faces of the stator winding and the stator iron core can be cooled.

Description

Technical Field

[0001] This application relates to the field of motor stator cooling technology, and in particular to a stator core. Background Technology

[0002] With the development of new energy vehicles, the requirements for motor speed, torque density and power density are getting higher and higher. During the operation of the motor, the stator winding and stator core will generate a lot of heat, so it is necessary to cool them down to ensure that the motor has stable output performance and a long service life.

[0003] Currently, the stator windings are mainly cooled by spraying. However, since the spray pipes are usually located above the stator core, the coolant sprayed from the spray pipes cannot completely cover the entire stator windings, resulting in a low coolant coverage rate and thus a poor overall cooling effect of the coolant on the motor. Utility Model Content

[0004] In view of this, this application provides a stator core to solve the technical problem in the prior art where the coolant cannot completely cover the stator windings and the end face of the stator core, resulting in poor cooling effect.

[0005] This application provides a stator core, which includes a body and an end portion. The outer wall of the body portion is provided with a first cooling channel. The end portion is connected to both sides of the body portion along the axial direction of the stator core. The end portion is provided with a plurality of second cooling channels that extend along the axial direction of the stator core and are spaced apart circumferentially.

[0006] The second cooling channel includes at least a first channel, a second channel, and a third channel. The first channel is connected to the first cooling channel, the third channel is connected to the end face of the stator core, and the first channel and the third channel are connected through the second channel.

[0007] Along the axial direction of the stator core, the projections of the first channel and the second channel at least partially overlap, the projections of the second channel and the third channel at least partially overlap, and the projections of the first channel and the third channel are not overlapped.

[0008] In this embodiment, a first cooling channel is provided on the outer wall of the main body, allowing the coolant to directly exchange heat with the stator core. The coolant's fluidity carries away the heat generated by the stator core during operation, thereby reducing the operating temperature of the stator core and keeping it within a suitable range. This achieves cooling of the stator core by the coolant, reducing the possibility of damage to the stator core due to high temperature during operation, and improving the stability and reliability of the stator core during operation.

[0009] Meanwhile, by providing ends with second cooling channels on both sides of the main body, during the flow of coolant within the first cooling channel, a portion of the coolant can continue to flow along its extension direction within the first cooling channel to absorb the heat generated by the stator core during operation. Another portion of the coolant can flow out of the first cooling channel through the second cooling channel and spray onto the stator winding, allowing this portion of coolant to exchange heat with the stator winding. The flow of the coolant carries away the heat generated by the stator winding during operation, thereby reducing the operating temperature of the stator winding and keeping it within a suitable range. This achieves cooling and temperature reduction of the stator winding by the coolant, thereby reducing the possibility of damage to the stator winding due to high temperature during operation and improving the stability and reliability of the stator winding during operation.

[0010] Furthermore, the coolant flowing out through the second cooling channel not only cools the stator windings but also covers the end faces of the stator core, thus cooling those end faces as well. Moreover, by providing multiple spaced-apart second cooling channels at the ends, all of which are connected to the first cooling channel, the spray range of the second cooling channels can be further expanded, thereby improving the heat dissipation efficiency and cooling effect of the coolant on the stator windings and stator core end faces.

[0011] In one possible implementation, the second cooling channel is arranged at an angle relative to the axial direction of the stator core along the axial direction of the stator core.

[0012] In one possible implementation, the stator core includes a plurality of end laminations, which are stacked along the axial direction of the stator core to form the ends. Each end lamination is provided with a plurality of hole groups spaced apart circumferentially along the stator core. The plurality of hole groups are stacked along the axial direction of the stator core to form the second cooling channel.

[0013] Along the axial direction of the stator core, some adjacent end laminations are staggered by a predetermined angle.

[0014] In one possible implementation, each of the hole groups includes a first through hole, a second through hole, and a third through hole that are circumferentially spaced along the stator core.

[0015] Along the radial direction of the stator core, the distance between the inner edge of the first through hole and the axis of the stator core is H1, the distance between the inner edge of the second through hole and the axis of the stator core is H2, and the distance between the inner edge of the third through hole and the axis of the stator core is H3, and H1, H2 and H3 satisfy H1>H2>H3.

[0016] In one possible implementation, along the radial direction of the stator core, the height of the first through hole is a1, the height of the second through hole is a2, and the height of the third through hole is a3, and a1, a2, and a3 satisfy H1≥H3+a3, H2+a2>H1, and H3+a3>H2.

[0017] In one possible implementation, along the circumferential direction of the stator core, the length of the first through hole is b1, the length of the second through hole is b2, and the length of the third through hole is b3, and b1, b2, and b3 satisfy b3 > b2 > b1.

[0018] In one possible implementation, both the second through hole and the third through hole are provided with reinforcing ribs, the reinforcing ribs dividing the second through hole into a plurality of first sub-through holes, and the reinforcing ribs dividing the third through hole into a plurality of second sub-through holes.

[0019] Wherein, the flow area of ​​the first through hole is S1, the flow area of ​​the first sub-through hole is S2, the flow area of ​​the second sub-through hole is S3, and S1, S2 and S3 satisfy S1=S2=S3, or S1>S2>S3.

[0020] In one possible implementation, along the circumference of the stator core, the included angle between adjacent similar hole groups and / or similar through holes is α1, and α1 satisfies 10°≤α1≤120°.

[0021] In one possible implementation, along the axial direction of the stator core, the angle between the spray axis of the second cooling channel and the end face of the stator core is α2, and α2 satisfies 10°≤α2≤90°.

[0022] In one possible implementation, the spray angle of the second cooling channel along the circumference of the stator core is α3, and α3 satisfies 60°≤α3≤150°.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the stator core provided in this application in one embodiment;

[0026] Figure 2 This is a cross-sectional view of the end portion provided in this application in one embodiment;

[0027] Figure 3 This is a schematic diagram of the structure of the end-piece lamination provided in this application in one embodiment;

[0028] Figure 4 This is a schematic diagram of the structure of the first through hole, the second through hole, and the third through hole provided in this application in one embodiment;

[0029] Figure 5 yes Figure 3 A magnified view of a portion of the image;

[0030] Figure 6 This is a side view of the end portion provided in this application;

[0031] Figure 7 This is a front view of the end portion provided in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Body part;

[0034] 14 - First cooling channel;

[0035] 2-end;

[0036] 23 - Second cooling channel;

[0037] 231 - First Channel;

[0038] 232 - Second Channel;

[0039] 233 - Third Channel;

[0040] 3-Stacked sheets;

[0041] 34-End stacked plates;

[0042] 341-hole group;

[0043] 341a - First through hole;

[0044] 341b - Second through hole;

[0045] 341b1 - First through hole;

[0046] 341c - Third through hole;

[0047] 341c1 - Second sub-through hole;

[0048] 342 - Reinforcing rib.

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0050] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0052] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0054] Embodiments of this application provide a stator core for use in an electric motor, such as... Figure 1 As shown, the stator core includes a body portion 1 and an end portion 2, with the end portion 2 connected to both sides of the body portion 1 along the axial direction of the stator core.

[0055] The outer wall of the main body 1 is provided with a first cooling channel 14, and the end 2 is provided with a plurality of second cooling channels 23 that extend axially and are spaced apart circumferentially, and each second cooling channel 23 is connected to the first cooling channel 14.

[0056] Specifically, such as Figure 2 As shown, the second cooling channel 23 includes at least a first channel 231, a second channel 232, and a third channel 233. The first channel 231 is connected to the first cooling channel 14, and the third channel 233 is connected to the end face of the stator core. The first channel 231 and the third channel 233 are connected through the second channel 232. Furthermore, along the axial direction of the stator core, the projections of the first channel 231 and the second channel 232 at least partially overlap, the projections of the second channel 232 and the third channel 233 at least partially overlap, and the projections of the first channel 231 and the third channel 233 are misaligned.

[0057] In this embodiment, by providing a first cooling channel 14 on the outer wall of the main body 1, the coolant can directly exchange heat with the stator core. The heat generated by the stator core during operation is carried away by the fluidity of the coolant, thereby reducing the operating temperature of the stator core and keeping it within a suitable range. This achieves cooling of the stator core by the coolant, thereby reducing the possibility of damage to the stator core due to high temperature during operation and improving the stability and reliability of the stator core during operation.

[0058] Meanwhile, the stator core is also provided with toothed grooves (not shown in the figure) to accommodate the stator windings (not shown in the figure). By providing end portions 2 with second cooling channels 23 on both sides of the main body 1, during the flow of coolant in the first cooling channel 14, a portion of the coolant can continue to flow in the first cooling channel 14 along its extension direction to absorb the heat generated by the stator core during operation. Another portion of the coolant can flow out of the first cooling channel 14 through the second cooling channel 23 and spray onto the stator windings, allowing this portion of the coolant to exchange heat with the stator windings. The flow of the coolant carries away the heat generated by the stator windings during operation, thereby reducing the operating temperature of the stator windings and keeping it within a suitable range. This achieves cooling and temperature reduction of the stator windings by the coolant, thereby reducing the possibility of damage to the stator windings due to high temperatures during operation and improving the stability and reliability of the stator windings during operation.

[0059] Furthermore, the coolant flowing out through the second cooling channel 23 can not only cool the stator windings but also cover the end faces of the stator core for cooling. Moreover, by providing multiple spaced-apart second cooling channels 23 on the end 2, all of which are connected to the first cooling channel 14, the spray range of the second cooling channels 23 can be further expanded, thereby improving the heat dissipation efficiency and cooling effect of the coolant on the stator windings and the end faces of the stator core.

[0060] Therefore, by setting up a connected first cooling channel 14 and a second cooling channel 23, the coolant can simultaneously cool the stator core and stator winding during the circulation process, thereby improving the stability and reliability of the motor during operation.

[0061] Specifically, along the axial direction of the stator core, the second cooling channel 23 includes a first channel 231, a second channel 232 and a third channel 233 that are connected to each other, and the projections of the first channel 231 and the second channel 232 at least partially overlap, the projections of the second channel 232 and the third channel 233 at least partially overlap, and the projections of the first channel 231 and the third channel 233 are misaligned.

[0062] The projections of the first channel 231 and the second channel 232 overlap at least partially, and the projections of the second channel 232 and the third channel 233 overlap at least partially, so that the coolant can flow out of the second cooling channel 23 through each channel and the overlapping part of each channel, and can spray the end face of the stator winding and the stator core at a preset angle. This helps to expand the spray range of the coolant and improve the uniformity of the coolant distribution, so as to cool and reduce the temperature of more stator windings and a larger area of ​​stator core end face, thereby improving the overall heat dissipation efficiency and cooling effect of the stator core.

[0063] Meanwhile, by ensuring that the projections of the first channel 231 and the third channel 233 do not overlap, the coolant is less likely to backflow, thus allowing the coolant to flow in the second cooling channel 23 along the direction from the body 1 toward the end 2. This helps to ensure the flow performance of the coolant in the second cooling channel 23, thereby facilitating a better spraying effect and ensuring the cooling effect of the coolant on the stator winding and stator core end face.

[0064] In one specific implementation, such as Figure 1 and Figure 2 As shown, the second cooling channel 23 is inclined relative to the axial direction of the stator core along the axial direction of the stator core.

[0065] In this embodiment, the second cooling channel 23 may be inclined along the circumferential normal of the stator core relative to the axial direction of the stator core, or the second cooling channel 23 may be inclined along the circumferential tangential of the stator core relative to the axial direction of the stator core, or the second cooling channel 23 may be inclined along both the circumferential normal and circumferential tangential of the stator core relative to the axial direction of the stator core.

[0066] Specifically, when the second cooling channel 23 is inclined along the circumferential normal of the stator core relative to the axial direction of the stator core, the distance between the outlet of the second cooling channel 23 and the stator winding can be shortened, thereby improving the spraying effect of the coolant and allowing most of the coolant to drip onto the end faces of the stator winding and the stator core, thus improving the overall cooling effect.

[0067] Specifically, when the second cooling channel 23 is inclined tangentially along the circumference of the stator core relative to the axial direction of the stator core, the spray range of the coolant can be expanded to achieve a larger coverage of the coolant, thereby increasing the overall cooling area.

[0068] More specifically, along the direction from the body portion 1 toward the end portion 2, the first channel 231 is arranged parallel to the axial direction of the stator core, and the second channel 232 is arranged inclined relative to the first channel 231 along the circumferential normal and circumferential tangential of the stator core, so that their projections at least partially overlap, thereby allowing the coolant in the first cooling channel 14 to flow into the first channel 231 and then into the second channel 232; the third channel 233 is arranged inclined relative to the second channel 232 along the circumferential normal and circumferential tangential of the stator core, so that their projections at least partially overlap, and the projections of the third channel 233 and the first channel 231 are misaligned, thereby allowing the coolant in the second channel 232 to flow smoothly out of the third channel 233 after flowing into the third channel 233, reducing the risk of coolant backflow, and ensuring that the coolant is sprayed onto the end faces of the stator winding and the stator core. The second cooling channel 23 can extend in a stepped shape, so that the coolant sprayed from the second cooling channel 23 has a large spray area and can produce a better spraying effect, thereby improving the cooling efficiency of the stator winding and stator core end face, and improving the stability and reliability of the motor during operation.

[0069] In one possible implementation, the tilt direction of the third channel 233 may be parallel to the tilt direction of the second channel 232 connected to it.

[0070] In one specific implementation, such as Figure 1 and Figure 3 As shown, the stator core can be formed by stacking multiple laminations 3 along its axial direction. The laminations 3 include multiple end laminations 34. The multiple end laminations 34 are stacked along the axial direction of the stator core to form end 2. Each end lamination 34 is provided with multiple hole groups 341 distributed circumferentially along the stator core. The multiple hole groups 341 are stacked along the axial direction of the stator core to form a second cooling channel 23.

[0071] Along the axial direction of the stator core, some adjacent end laminations 34 are staggered by a predetermined angle.

[0072] In this embodiment, since the second cooling channel 23 is located inside the end 2, the method of stacking multiple end laminations 34 to form the end 2 reduces the difficulty of machining the second cooling channel 23 on the end 2, which is beneficial to improving the machining efficiency of the second cooling channel 23 and the production efficiency of the end 2, and is more in line with actual production needs. Simultaneously, during the stacking of multiple end laminations 34 along the axial direction of the stator core, only the multiple end laminations 34 need to be stacked and assembled along the axial direction of the stator core to obtain the end 2 with the first channel 231, the second channel 232, and the third channel 233, which is simple to operate and easy to assemble. Furthermore, by simply rotating a portion of the end laminations 34 circumferentially along the stator core by a predetermined angle, at least partial overlap between the first channel 231 and the second channel 232, and between the second channel 232 and the third channel 233, is achieved, and the first channel 231 and the third channel 233 are staggered, thereby making the second cooling channel 23 extend in a stepped manner. In addition, this design method can also improve the flexibility of the stacking process. By adjusting the number of end stacks 34 and the rotation angle of the end stacks 34 during the stacking process, the second cooling channel 23 with different extended structures can be obtained, thereby increasing the diversity of the end structure to meet the needs of different products.

[0073] Specifically, along the longitudinal direction of the stator core, each end lamination 34 has multiple hole groups 341 on its outer edge, and these hole groups 341 are spaced apart along the circumferential direction of the stator core. Each hole group 341 can be formed by stamping or blanking, so that the end 2 can be formed by stacking the same type of end lamination 34, thereby reducing the processing difficulty and production cost of the end lamination 34.

[0074] In one specific implementation, such as Figure 3 and Figure 4 As shown, each hole group 341 includes a first through hole 341a, a second through hole 341b and a third through hole 341c, which are distributed circumferentially along the stator core.

[0075] Along the radial direction of the stator core, the distance between the inner edge of the first through hole 341a and the axis of the stator core is H1, the distance between the inner edge of the second through hole 341b and the axis of the stator core is H2, and the distance between the inner edge of the third through hole 341c and the axis of the stator core is H3, and H1, H2 and H3 satisfy H1>H2>H3.

[0076] In this embodiment of the application, along the axial direction of the stator core, a plurality of first through holes 341a can be stacked to form a first channel 231, a plurality of second through holes 341b can be stacked to form a second channel 232, and a plurality of third through holes 341c can be stacked to form a third channel 233.

[0077] During the stacking of multiple end laminations 34, after a predetermined number of end laminations 34 are stacked, they need to be rotated by a predetermined angle along the circumference of the stator core, so that the second through hole 341b of the rotated end lamination 34 can at least partially overlap with the first through hole 341a of the end lamination 34 before rotation, and the first through hole 341a and the second through hole 341b can be adjacent first through hole 341a and second through hole 341b in the same hole group 341; and also so that the third through hole 341c of the rotated end lamination 34 can at least partially overlap with the second through hole 341b of the end lamination 34 before rotation, and the second through hole 341b and the third through hole 341c can be adjacent second through hole 341b and third through hole 341c in the same hole group 341.

[0078] Thus, the end 2 formed by stacking multiple end laminations 34 can have a second cooling channel 23 that is axially inclined relative to the stator core. By setting the distance H1 between the inner edge of the first through hole 341a and the axis of the stator core, the distance H2 between the inner edge of the second through hole 341b and the axis of the stator core, and the distance H3 between the inner edge of the third through hole 341c and the axis of the stator core to satisfy H1 > H2 > H3, the distance between the outlet of each channel and the axis of the stator core gradually decreases. As a result, after the coolant is sprayed out from the outlet of the second cooling channel 23 (i.e., the outlet of the third channel 233), most of it can drip onto the end faces of the stator winding and the stator core. This is beneficial to improving the spraying effect of the end 2, increasing the coverage area of ​​the coolant, and thus improving the cooling effect of the coolant on the end faces of the stator winding and the stator core, thereby improving the stability and reliability of the motor during operation.

[0079] In addition, a positioning part can be provided at the center of the outer edge of each through hole to play a positioning role during the stacking of multiple end pieces 34. This allows the positioning part of the second through hole 341b of the rear end piece 34 to be aligned with the positioning part of the first through hole 341a of the front end piece 34, and the positioning part of the third through hole 341c of the rear end piece 34 to be aligned with the positioning part of the second through hole 341b of the front end piece 34. This enables rapid and accurate stacking of multiple end pieces 34, thereby improving the stacking efficiency of multiple end pieces 34 and increasing the production efficiency of end 2.

[0080] In one specific implementation, such as Figure 4 and Figure 5 As shown, along the radial direction of the stator core, the height of the first through hole 341a is a1, the height of the second through hole 341b is a2, and the height of the third through hole 341c is a3, and a1, a2 and a3 satisfy H1≥H3+a3, H2+a2>H1, H3+a3>H2.

[0081] In this embodiment, by setting the distance H1 between the inner edge of the first through hole 341a and the stator core axis to be greater than or equal to the sum of the distance H3 between the inner edge of the third through hole 341c and the stator core axis and the height a3 of the third through hole 341c, the outer edge of the first through hole 341a and the inner edge of the third through hole 341c located on the same end lamination 34 are at least partially separated along the longitudinal direction of the stator core, or the two are located on the same arc. This allows the first channel 231 and the third channel 233 to be misaligned along the axial direction of the stator core after multiple end laminations 34 are stacked to form the second cooling channel 23. This ensures that the coolant in the first cooling channel 14 can flow into the correct second cooling channel 23, so that the coolant can be sprayed onto the end faces of the stator winding and the stator core in sequence through the first channel 231, the second channel 232 and the third channel 233, thereby improving the cooling effect and heat dissipation efficiency.

[0082] Simultaneously, the staggered distribution of the first channel 231 and the third channel 233 can prevent coolant from seeping into the space between adjacent end plates 34 after flowing into the incorrect second cooling channel, thus avoiding coolant waste. This incorrect second cooling channel includes a second cooling channel composed of the first channel 231, the third channel 233, and the second channel 232.

[0083] Furthermore, based on the condition that the distances H1 between the inner edge of the first through hole 341a and the stator core axis, H2 between the inner edge of the second through hole 341b and the stator core axis, and H3 between the inner edge of the third through hole 341c and the stator core axis satisfy H1 > H2 > H3, the inner edge of the first through hole 341a and the bottom wall of the first cooling channel 14 can be arranged in the same arc along the radial direction of the stator core. This can further reduce the possibility of coolant flowing into the wrong second cooling channel 23, thereby improving the utilization rate of coolant.

[0084] In one possible implementation, the heights a1 of the first through hole 341a, a2 of the second through hole 341b, and a3 of the third through hole 341c can satisfy a1=a2=a3, so that the height dimensions of each through hole along the radial direction of the stator core are the same. Thus, by simply changing the opening position of each through hole, the distances H1 between the inner edge of the first through hole 341a and the axis of the stator core, H2 between the inner edge of the second through hole 341b and the axis of the stator core, and H3 between the inner edge of the third through hole 341c and the axis of the stator core can be decreased sequentially.

[0085] In one specific implementation, such as Figure 5 As shown, along the circumference of the stator core, the length of the first through hole 341a is b1, the length of the second through hole 341b is b2, and the length of the third through hole 341c is b3, and b1, b2 and b3 satisfy b3>b2>b1.

[0086] In this embodiment, along the circumference of the stator core, the lengths of the first through hole 341a, the second through hole 341b, and the third through hole 341c gradually increase, thereby gradually increasing the flow area of ​​the first channel 231, the second channel 232, and the third channel 233. This results in the second cooling channel 23 having a smaller inlet and a larger outlet, which helps to reduce the flow velocity of the coolant at the outlet and prolong its flow time within the second cooling channel 23. This improves the heat exchange efficiency between the coolant and the end 2, thereby enhancing the cooling effect of the coolant on the end 2 and improving the stability and reliability of the motor during operation.

[0087] Meanwhile, the lower flow rate allows some coolant to be sprayed onto the stator windings for heat exchange, while another portion of the coolant flows along the end face of the stator core for heat exchange. This achieves complete coverage of the stator windings and the end face of the stator core, which helps improve the cooling effect of the coolant on the stator windings and the end face of the stator core, thus improving the overall heat dissipation efficiency.

[0088] In addition, the larger outlet can make the coolant in the second cooling channel 23 have a more uniform flow rate distribution, so as to further expand the spray range during the spraying process and achieve a better coverage effect.

[0089] In one specific implementation, such as Figure 5 As shown, both the second through hole 341b and the third through hole 341c are provided with reinforcing ribs 342. The reinforcing ribs 342 divide the second through hole 341b into multiple first sub-through holes 341b1, and the reinforcing ribs 342 divide the third through hole 341c into multiple second sub-through holes 341c1.

[0090] The flow area of ​​the first through hole 341a is S1, the flow area of ​​the first sub-through hole 341b1 is S2, and the flow area of ​​the second sub-through hole 341c1 is S3. S1, S2 and S3 satisfy S1=S2=S3, or S1>S2>S3.

[0091] In this embodiment of the application, by providing reinforcing ribs 342 in the second through hole 341b and the third through hole 341c with a large flow area, the structural strength of the second through hole 341b and the third through hole 341c can be improved. This allows the second channel 232 and the third channel 233 to have strong structural stability after multiple end plates 34 are stacked to form the end 2, which is beneficial to improving the flow stability and smoothness of the coolant in the second cooling channel 23.

[0092] Meanwhile, by setting reinforcing ribs 342, the second through hole 341b and the third through hole 341c, which have a larger flow area, can be divided into multiple first sub-through holes 341b1 and multiple second sub-through holes 341c1, respectively.

[0093] Specifically, since the flow area of ​​the third through hole 341c is larger than that of the second through hole 341b, to ensure that the flow areas of each sub-through hole are equal, the number of reinforcing ribs 342 in the third through hole 341c can be greater than the number of reinforcing ribs 342 in the second through hole 341b, thereby making the number of second sub-through holes 341c1 greater than the number of first sub-through holes 341b1. When the second through hole 341b has one reinforcing rib 342 and the third through hole 341c has two reinforcing ribs 342, one inlet of the second cooling channel 23 can correspond to at least three outlets distributed circumferentially along the stator core. This is beneficial for improving the structural stability of the second cooling channel 23 while expanding the spray range of the coolant, thereby improving the cooling effect of the coolant on the stator winding and the end face of the stator core, and improving the stability and reliability of the motor during operation.

[0094] Furthermore, the flow area S1 of the first through hole 341a, the flow area S2 of the first sub-through hole 341b1, and the flow area S3 of the second sub-through hole 341c1 can all be equal, so as to reduce the number of punching dies during the processing of each through hole, thereby helping to reduce the processing cost of each through hole and improve processing efficiency. Alternatively, the flow area S1 of the first through hole 341a, the flow area S2 of the first sub-through hole 341b1, and the flow area S3 of the second sub-through hole 341c1 can be decreased sequentially, so that the flow area of ​​any outlet in the same second cooling channel 23 is smaller than the flow area of ​​its inlet, thereby increasing the pressure at each outlet, increasing the flow velocity of the coolant at each outlet, improving the flow efficiency of the coolant, and further enhancing the spraying effect of the coolant.

[0095] In other embodiments, along the axial direction of the stator core, the flow area S1 of the first through hole 341a, the flow area S2 of the first sub-through hole 341b1, and the flow area S3 of the second sub-through hole 341c1 can also satisfy S3>S2>S1, or S1=S3, S1>S2, S3>S2, or S1=S3, S2>S1, S2>S3, etc.

[0096] In one possible implementation, chamfers are provided at the connection points of each reinforcing rib 342 and each through hole, as well as at the junctions of the edges of each through hole. This helps to reduce the possibility of stress concentration at the connection points, thereby reducing the possibility of the reinforcing rib 342 breaking under the impact of the coolant. This, in turn, improves the stability and reliability of the connection between the reinforcing rib 342 and the through hole, thus extending the service life of the second cooling channel 23.

[0097] Among them, the shape of the stiffener 342 along the radial direction of the stator core can be rectangular or trapezoidal.

[0098] In one specific implementation, such as Figure 4 As shown, along the circumference of the stator core, the included angle between adjacent similar hole groups 341 and / or similar through holes is α1, and α1 satisfies 10°≤α1≤120°, and the shape of each through hole is one or more of the following: triangle, rectangle, trapezoid, circle and ellipse.

[0099] In this embodiment of the application, the included angle α1 between adjacent similar hole groups 341 and / or similar through holes can specifically be 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, etc.

[0100] It should be noted that, along the radial direction of the stator core, the direction of the left edge of each hole group 341 toward the axis is the normal direction of the left edge of the hole group 341, the direction of the right edge of each hole group 341 toward the axis is the normal direction of the right edge of the hole group 341, the direction of the left edge of each through hole toward the axis is the normal direction of the left edge of the through hole, and the direction of the right edge of each through hole toward the axis is the normal direction of the right edge of the through hole.

[0101] Along the circumference of the stator core, the included angle α1 can be formed between the left edge normal of any hole group 341 and the left edge normal of its adjacent similar hole group 341, or between the right edge normal of any hole group 341 and the right edge normal of its adjacent similar hole group 341, or between the left edge normal of any through hole and the left edge normal of its adjacent similar through hole, or between the right edge normal of any through hole and the right edge normal of its adjacent similar through hole.

[0102] When the included angle α1 between adjacent similar hole groups 341 and / or similar through holes satisfies 10°≤α1≤120°, the end 2 has more second cooling channels 23, which can increase the contact area between the coolant and the end 2, improve the efficiency of heat exchange between the coolant and the end 2, and improve the cooling effect of the coolant on the end 2. At the same time, the distance between the outlets of each second cooling channel 23 along the circumference of the stator core is relatively moderate, so that the coolant can be evenly sprayed on the end faces of the stator winding and the stator core after flowing out from each outlet, thereby improving the cooling effect of the coolant on both, which is conducive to improving the overall heat dissipation efficiency. In addition, it can also reduce the number of openings on each end lamination 34 while ensuring a large coolant spray range, thereby improving the structural strength of each end lamination 34. Moreover, setting the shape of each through hole as triangular, rectangular, trapezoidal, circular and elliptical has the characteristics of simple structure and easy implementation, which helps to reduce the processing difficulty and improve the processing efficiency.

[0103] In one specific implementation, such as Figure 6 As shown, along the axial direction of the stator core, the angle between the spray axis of the second cooling channel 23 and the end face of the stator core is α2, and α2 satisfies 10°≤α2≤90°.

[0104] In this embodiment of the application, the included angle α2 between the spray axis of the second cooling channel 23 and the end face of the stator core can be 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.

[0105] It should be noted that, along the axial direction of the stator core, there is a first overlapping area between the first channel 231 and the second channel 232, and a second overlapping area between the second channel 232 and the third channel 233. The end of the third channel 233 away from the first cooling channel 14 has a liquid outlet. The line connecting the center of the first overlapping area, the center of the second overlapping area, and the center of the liquid outlet is the spray axis of the second cooling channel 23.

[0106] When the angle α2 between the spray axis of the second cooling channel 23 and the end face of the stator core satisfies 10°≤α2≤90°, the coolant can flow out of the second cooling channel 23 at a suitable angle range under the structural action of the second cooling channel 23. This ensures that most of the coolant, after flowing out of the outlet of the second cooling channel 23, can be fully and evenly sprayed onto the end faces of the stator winding and stator core and directly exchange heat with them. This is beneficial to improving the utilization rate of the coolant, improving the cooling effect of the coolant on the end faces of the stator winding and stator core, thereby improving the stability and reliability of the stator core and stator winding during operation, and thus extending the service life of the motor.

[0107] Specifically, the angle α2 between the spray axis of the second cooling channel 23 and the end face of the stator core is determined by the thickness, number and arrangement of each end lamination 34, the height of each through hole and the distance between the inner edge of each through hole and the axis of the stator core.

[0108] For example, while keeping the total thickness of end 2 constant, only the number of end laminations 34 forming the first channel 231, the second channel 232, and the third channel 233 is changed. That is, when the number of laminations 3 forming the first channel 231 is reduced and the number of laminations 3 forming the second channel 232 and the third channel 233 is increased, along the axial direction of the stator core, the depth of the first channel 231 decreases, and the depth of the second channel 232 and the third channel 233 increases. This increases the distance between the center of the first overlapping region and the center of the second overlapping region, and the angle between the line connecting the two regions and the radial direction of the stator core increases. The distance between the center of the second overlapping region and the center of the liquid outlet also increases, and the angle between the line connecting the two regions and the radial direction of the stator core increases. Consequently, the angle between the spray axis of the second cooling channel 23 and the end face of the stator core increases.

[0109] In one specific implementation, such as Figure 7 As shown, along the circumference of the stator core, the spray angle of the second cooling channel 23 is α3, and α3 satisfies 60°≤α3≤150°.

[0110] In this embodiment of the application, the spray angle α3 of the second cooling channel 23 can specifically be 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc.

[0111] It should be noted that, along the circumference of the stator core, there are two first overlapping regions between the first channel 231 and the second channel 232, four second overlapping regions between the second channel 232 and the third channel 233, and three liquid outlets at the end of the third channel 233 away from the first cooling channel 14.

[0112] Wherein, along the axial direction of the stator core, the line connecting the center of the leftmost first overlapping region, the center of the leftmost second overlapping region, and the center of the leftmost liquid outlet is the first edge line of the spray range of the second cooling channel 23, and the line connecting the center of the rightmost first overlapping region, the center of the rightmost second overlapping region, and the center of the rightmost liquid outlet is the second edge line of the spray range of the second cooling channel 23, and the angle between the first edge line and the second edge line is the spray angle of the second cooling channel 23 along the circumference of the stator core.

[0113] Specifically, the spray angle of the second cooling channel 23 is formed by the spray angles of its multiple liquid outlets, wherein the spray angle of each liquid outlet can be obtained by measuring the length and width of each second sub-through hole 341c1.

[0114] When the spray angle α3 of the second cooling channel 23 satisfies 60°≤α3≤150°, the coolant can flow out of the second cooling channel 23 at a suitable angle range under the action of multiple outlets of the second cooling channel 23. This ensures that after the coolant flows out from the multiple outlets of the second cooling channel 23, it can be sprayed at a larger angle onto the end faces of the stator winding and stator core and directly exchange heat with them. This is beneficial to improving the utilization rate of the coolant, improving the cooling effect of the coolant on the end faces of the stator winding and stator core, thereby improving the stability and reliability of the stator core and stator winding during operation, and thus extending the service life of the motor.

[0115] Specifically, the spray angle α3 of the second cooling channel 23 is determined by the thickness, number and arrangement of each end lamination 34, and the length of each through hole along the circumference of the stator core.

[0116] For example, while keeping the total thickness of end 2 constant, only the number of end laminations 34 forming the first channel 231, the second channel 232, and the third channel 233 is changed. That is, when the number of laminations 3 forming the first channel 231 is reduced and the number of laminations 3 forming the second channel 232 and the third channel 233 is increased, the depth of the first channel 231 decreases and the depth of the second channel 232 and the third channel 233 increases along the axial direction of the stator core, which makes the included angle between the first edge line and the second edge line smaller, thereby reducing the spray range of the second cooling channel 23.

[0117] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this application. The above description is only a preferred embodiment of this application, but this application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of this application, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, should be within the protection scope of this application.

Claims

1. A stator core, characterized in that, The stator core includes: The main body has a first cooling channel provided on its outer wall. The end portion is connected to both sides of the body portion along the axial direction of the stator core, and the end portion is provided with a plurality of second cooling channels that extend along the axial direction of the stator core and are spaced apart circumferentially. The second cooling channel includes at least a first channel, a second channel, and a third channel. The first channel is connected to the first cooling channel, and the third channel is connected to the end face of the stator core. The first channel and the third channel are connected through the second channel. Along the axial direction of the stator core, the projections of the first channel and the second channel at least partially overlap, the projections of the second channel and the third channel at least partially overlap, and the projections of the first channel and the third channel are not overlapped.

2. The stator core according to claim 1, characterized in that, Along the axial direction of the stator core, the second cooling channel is inclined relative to the axial direction of the stator core.

3. The stator core according to claim 1, characterized in that, The stator core includes multiple end laminations, which are stacked along the axial direction of the stator core to form the ends. Each end lamination is provided with multiple groups of holes spaced apart along the circumference of the stator core. The multiple groups of holes are stacked along the axial direction of the stator core to form the second cooling channel. Along the axial direction of the stator core, some adjacent end laminations are staggered by a predetermined angle.

4. The stator core according to claim 3, characterized in that, Each of the hole groups includes a first through hole, a second through hole, and a third through hole that are spaced apart circumferentially along the stator core; Along the radial direction of the stator core, the distance between the inner edge of the first through hole and the axis of the stator core is H1, the distance between the inner edge of the second through hole and the axis of the stator core is H2, and the distance between the inner edge of the third through hole and the axis of the stator core is H3, and H1, H2 and H3 satisfy H1>H2>H3.

5. The stator core according to claim 4, characterized in that, Along the radial direction of the stator core, the height of the first through hole is a1, the height of the second through hole is a2, and the height of the third through hole is a3, and a1, a2, and a3 satisfy H1≥H3+a3, H2+a2>H1, and H3+a3>H2.

6. The stator core according to claim 4, characterized in that, Along the circumference of the stator core, the length of the first through hole is b1, the length of the second through hole is b2, and the length of the third through hole is b3, and b1, b2, and b3 satisfy b3 > b2 > b1.

7. The stator core according to claim 4, characterized in that, Both the second through hole and the third through hole are provided with reinforcing ribs. The reinforcing ribs divide the second through hole into a plurality of first sub-through holes, and the reinforcing ribs divide the third through hole into a plurality of second sub-through holes. Wherein, the flow area of ​​the first through hole is S1, the flow area of ​​the first sub-through hole is S2, the flow area of ​​the second sub-through hole is S3, and S1, S2 and S3 satisfy S1=S2=S3, or S1>S2>S3.

8. The stator core according to claim 4, characterized in that, Along the circumference of the stator core, the included angle between adjacent similar hole groups and / or similar through holes is α1, and α1 satisfies 10°≤α1≤120°.

9. The stator core according to any one of claims 1-8, characterized in that, Along the axial direction of the stator core, the angle between the spray axis of the second cooling channel and the end face of the stator core is α2, and α2 satisfies 10°≤α2≤90°.

10. The stator core according to any one of claims 1-8, characterized in that, Along the circumference of the stator core, the spray angle of the second cooling channel is α3, and α3 satisfies 60°≤α3≤150°.

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