Stator core, stator, motor, powertrain, and vehicle

Abstract

The present invention discloses a stator core, a stator, a motor, a powertrain and a vehicle. The stator core includes: a plurality of stator lamination groups which are stacked along the axial direction of the stator core, and each stator lamination group includes a plurality of stator laminations stacked along the axial direction of the stator core; wherein, the dimension of the stator lamination group along the axial direction of the stator core is L2, the number of welding points between two adjacent stator lamination groups is N, the dimension of the welding points along the axial direction of the stator core is L1, the outer diameter of the stator lamination is R, and L1, L2, N and R satisfy the relational expressions: 0.12 ≤ L1 / L2 ≤ 0.6, and 0.026 ≤ N / R ≤ 0.043. Thus, by designing the stator core, on the basis of meeting the bonding force between stator laminations, it is also possible to reduce the deterioration of iron loss caused by traditional integral welding, thereby improving the structural firmness of the stator core and the efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a stator core, a stator, an electric motor, a powertrain, and a vehicle. Background Art

[0002] The stator of an electric motor is a key component of the electric motor, which is an important path for the flow of air-gap magnetic flux. At the same time, it plays an important role in fixing the armature winding to achieve the conversion of electrical energy to mechanical energy through armature reaction. When an electric vehicle uses a drive motor, there are high requirements for various indicators such as torque, power, efficiency, NVH performance, and cost. How to innovate the design and manufacturing process of the stator of a new energy drive motor on the basis of taking into account performance and cost has always been a research hotspot in the industry.

[0003] In related technologies, traditional motor stator forming processes include riveting, welding, and the process of riveting + integral welding, but each has its own disadvantages. Among them, riveting is only applicable to motors with smaller sizes because the bonding force between the core laminations is small. Welding and riveting + integral welding will cause large-area ablation of the insulation layer of the motor stator, increasing the iron loss of the motor stator and affecting the motor efficiency. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a stator core that can, on the basis of satisfying the bonding force between stator laminations, also reduce the deterioration of iron loss caused by traditional integral welding.

[0005] The present invention further provides a stator.

[0006] The present invention further provides an electric motor.

[0007] The present invention further provides a powertrain.

[0008] The present invention further provides a vehicle.

[0009] The stator core according to the first aspect of the present invention includes: a plurality of stator lamination groups, the plurality of stator lamination groups are stacked along the axial direction of the stator core, and each stator lamination group includes a plurality of stator laminations stacked along the axial direction of the stator core; wherein, the dimension of the stator lamination group along the axial direction of the stator core is L2, the number of welding points between two adjacent stator lamination groups is N, the dimension of the welding points along the axial direction of the stator core is L1, the outer diameter of the stator lamination is R, and L1, L2, N, and R satisfy the relational expression: 0.12 ≤ L1 / L2 ≤ 0.6, and 0.026 ≤ N / R ≤ 0.043.

[0010] Thus, by designing the stator core, on the basis of meeting the bonding force between the stator punching sheets, the iron loss deterioration caused by traditional integral welding can be reduced, thereby improving the structural firmness of the stator core and the motor efficiency.

[0011] In some examples of the present invention, L1 and L2 satisfy the relational expression: 0.4 ≤ L1 / L2 ≤ 0.5.

[0012] In some examples of the present invention, N and R satisfy the relational expression: 0.028 ≤ N / R ≤ 0.035.

[0013] In some examples of the present invention, L1 satisfies the relational expression: 3 mm ≤ L1 ≤ 6 mm.

[0014] In some examples of the present invention, L2 satisfies the relational expression: 10 mm ≤ L2 ≤ 25 mm.

[0015] In some examples of the present invention, N satisfies the relational expression: 6 ≤ N ≤ 8.

[0016] In some examples of the present invention, R satisfies the relational expression: 160 mm ≤ R ≤ 230 mm.

[0017] In some examples of the present invention, N solder joints between two adjacent stator punching sheet groups are evenly distributed in the circumferential direction of the stator punching sheet group.

[0018] In some examples of the present invention, a plurality of weld grooves are provided on the outer peripheral surface of the stator punching sheet group. The plurality of weld grooves extend along the axial direction of the stator core and are spaced apart in the circumferential direction of the stator punching sheet group. N solder joints between two adjacent stator punching sheet groups are respectively arranged in the plurality of weld grooves.

[0019] In some examples of the present invention, the plurality of weld grooves are evenly distributed in the circumferential direction of the stator punching sheet group.

[0020] In some examples of the present invention, a rib protruding towards the notch is formed at the bottom of the weld groove, and the solder joint is arranged on the rib.

[0021] In some examples of the present invention, the thickness of the stator punching sheet is D, and H and D satisfy the relational expression: L1 ≥ 5D.

[0022] In some examples of the present invention, the total number of the solder joints of the stator core is N 总 , the axial dimension of the stator core is L, N 总 satisfies the relational expression: 24 ≤ N 总 = N×L / L2 ≤ 80.

[0023] In some examples of the present invention, the number of solder joints between at least two of the stator lamination groups and adjacent stator lamination groups is different.

[0024] In some examples of the present invention, the total number of solder joints of the stator core is N 总 , and the theoretical number of solder joints between adjacent stator lamination groups is . In the direction extending from one axial end of the stator core to the other axial end, the number of solder joints between adjacent stator lamination groups is successively , , , ……, . The number of stator lamination groups is K; where N 总 = ; 24 ≤ N 总 ≤ 80.

[0025] The stator according to the second aspect of the present invention includes: the above-mentioned stator core.

[0026] The motor according to the third aspect of the present invention includes: the above-mentioned stator.

[0027] The powertrain according to the fourth aspect of the present invention includes: the above-mentioned motor.

[0028] The vehicle according to the fifth aspect of the present invention includes: the above-mentioned powertrain.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is a schematic structural diagram of a stator core according to an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of a stator core according to another embodiment of the present invention;

[0033] Figure 3 is a side view of a stator core according to an embodiment of the present invention;

[0034] Figure 4 is Figure 3 an enlarged view of area A in

[0035] Figure 5 is a front view of a stator lamination group according to an embodiment of the present invention;

[0036] Figure 6 is a front view of a stator punching set according to another embodiment of the present invention;

[0037] Figure 7 is a front view of a stator punching set according to still another embodiment of the present invention;

[0038] Figure 8 is an assembly schematic diagram according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] 100, stator core;

[0041] 10, stator punching set; 11, weld groove; 111, rib; 12, stator punching; 13, rivet button; 14, welding point. Detailed implementation manners

[0042] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0043] Below with reference to Figures 1-8 describing the stator core 100 according to an embodiment of the present invention can ensure the production rhythm of the stator core 100 and can also reduce the deterioration of iron loss caused by traditional integral welding, thereby taking into account both production efficiency and motor efficiency at the same time.

[0044] Combined with Figures 1-8 as shown, the stator core 100 according to the first aspect embodiment of the present invention includes a plurality of stator punching sets 10. Among them, the plurality of stator punching sets 10 are stacked together in a specific manner to form a complete stator core 100. Moreover, in order to ensure the uniformity of the magnetic field, the stator punching sets 10 need to be precisely aligned, thereby improving the overall performance of the motor; and by assembling the stator punching sets 10 in batches, it is convenient for assembly and the production rhythm can be improved.

[0045] Specifically, the plurality of stator punching sets 10 are stacked along the axial direction of the stator core 100. The stator punching set 10 includes a plurality of stator punchings 12 stacked along the axial direction of the stator core 100, and welding points 14 for connection are provided between two adjacent stator punching sets 10.

[0046] Specifically, each stator lamination group 10 is formed by laminating a plurality of stator laminations 12 along the axial direction of the stator core 100. Adjacent stator laminations 12 can be first connected together by riveting, and then adjacent stator lamination groups 10 are connected together by welding. Compared with the traditional integrally welded stator core (i.e., adjacent stator laminations are all connected by welding), in the embodiment of this case, after first riveting some stator laminations 12 into a stator lamination group 10, and then connecting adjacent stator lamination groups 10 by welding to each other, this can avoid the problem of large-area ablation caused by the welding process on the insulation layer of each stator lamination 12, reduce the risk of deterioration of the iron loss of the stator core 100, and thus improve the motor efficiency; compared with the traditional method of connecting adjacent stator laminations by adhesive process, the embodiment of this case has a faster production beat and lower production cost.

[0047] Specifically, the dimension of the stator lamination group 10 along the axial direction of the stator core 100 is L2, the number of welding points 14 between two adjacent stator lamination groups 10 is N, the dimension of the welding points 14 along the axial direction of the stator core 100 is L1, and the outer diameter of the stator lamination 12 is R. L1, L2, N, and R satisfy the relational formula: 0.12 ≤ L1 / L2 ≤ 0.6, and 0.026 ≤ N / R ≤ 0.043. Among them, the outer diameter of the stator lamination 12 is the diameter of the stator lamination 12, and the above parameter relational formulas of L1 / L2 and N / R are obtained from empirical data verified by experiments (as shown in Table 1).

[0048] Table 1

[0049]

[0050] By comparing the above data, the following conclusions can be drawn: when the ratio between the dimension of the welding points 14 along the axial direction of the stator core 100 and the dimension of the stator lamination group 10 along the axial direction of the stator core 100 is within the range of 0.12 - 0.6, and the ratio between the number of welding points 14 between two adjacent stator lamination groups 10 and the outer diameter of the stator lamination 12 is within the range of 0.026 - 0.043, at this time, the stator core 100 can, on the basis of meeting the bonding force (i.e., the pulling force) between the stator laminations 12, also reduce the number of welding points 14 and the iron loss ratio of the motor, so as to take into account both the firmness of the stator core 100 and the motor efficiency. For example, L1 / L2 can be 0.12, 0.2, 0.3, 0.5, 0.6, etc., not limited thereto; N / R can be 0.026, 0.03, 0.035, 0.043, etc., not limited thereto.

[0051] Thus, by designing the stator core 100, on the basis of satisfying the bonding force between the stator laminations 12, the deterioration of iron loss caused by traditional integral welding can also be reduced, thereby improving the structural firmness of the stator core 100 and the motor efficiency.

[0052] Preferably, L1 and L2 satisfy the relationship: 0.4 ≤ L1 / L2 ≤ 0.5. Wherein, when the ratio between the dimension of the solder joint 14 along the axial direction of the stator core 100 and the dimension of the stator lamination group 10 along the axial direction of the stator core 100 is within the range of 0.4 - 0.5, the dimension of the solder joint 14 along the axial direction of the stator core 100 is closer to or equal to half of the dimension of the stator lamination group 10 along the axial direction of the stator core 100. In this way, the dimension of the solder joint 14 along the axial direction of the stator core 100 can be relatively increased, so as to increase the welding area between the solder joint 14 and the stator lamination group 10 on the premise of reducing the deterioration of iron loss, and better improve the connection firmness between the stator lamination groups 10. For example, L1 / L2 can be 0.4, 0.45, 0.5, etc., and is not limited thereto.

[0053] Preferably, N and R satisfy the relationship: 0.028 ≤ N / R ≤ 0.035. Wherein, when the ratio between the number of the solder joints 14 between two adjacent stator lamination groups 10 and the outer diameter of the stator lamination 12 is within the range of 0.028 - 0.035, the number of the solder joints 14 between two adjacent stator lamination groups 10 is relatively less. In this way, on the basis of satisfying the bonding force between the stator lamination groups 10, the number of the solder joints 14 can also be reduced, so as to better reduce the iron loss ratio and improve the motor efficiency. For example, N / R can be 0.028, 0.3, 0.035, etc., and is not limited thereto.

[0054] Preferably, L1 satisfies the relationship: 3mm ≤ L1 ≤ 6mm. Wherein, the dimension of the solder joint 14 along the axial direction of the stator core 100 is limited within a reasonable range. On the one hand, it can ensure the welding contact area that meets the connection strength between the stator lamination groups 10. On the other hand, it can also avoid occupying too much extra space and reduce the iron loss ratio of the stator core 100, so as to take into account the firmness of the stator core 100 and the motor efficiency at the same time. For example, the dimension of the solder joint 14 along the axial direction of the stator core 100 can be 3mm, 4mm, 5mm, 6mm, etc., and is not limited thereto.

[0055] In another preferred embodiment, L2 satisfies the relation: 10 mm ≤ L2 ≤ 25 mm. Herein, the dimension of the stator lamination stack 10 along the axial direction of the stator core 100 is limited within a reasonable range, so as to avoid the risk that the bonding force (riveting) of the stator laminations 12 within the same stator lamination stack 10 is insufficient due to its excessive axial dimension, thereby improving the structural reliability of the stator core 100. For example, the dimension of the stator lamination stack 10 along the axial direction of the stator core 100 can be 10 mm, 12 mm, 15 mm, 18 mm, and 20 mm, but not limited thereto.

[0056] In another preferred embodiment, N satisfies the relation: 6 ≤ N ≤ 8. Herein, the number of the solder joints 14 between two adjacent stator lamination stacks 10 is limited within a reasonable range, so as to evenly distribute the connection stress on multiple solder joints 14 while ensuring the connection strength between two adjacent stator lamination stacks 10, avoid the risk of local stress concentration, and can also reduce the number of unnecessary solder joints 14 as much as possible, thereby reducing the iron loss ratio and further improving the firmness of the electronic core and the efficiency of the motor. For example, the number of the solder joints 14 between two adjacent stator lamination stacks 10 can be 6, 7, or 8.

[0057] In another preferred embodiment, R satisfies the relation: 160 mm ≤ R ≤ 230 mm. Herein, the outer diameter of the stator lamination 12 is limited within a reasonable range, so that the outer diameter of the stator lamination 12 is relatively large, which is convenient for the stator core 100 to accommodate more windings, thereby improving the electromagnetic conversion efficiency of the motor, and can also avoid the risk of the decrease in magnetic flux density due to its excessive size, and is also helpful for controlling the eddy current path length, reducing the eddy current loss, and improving the overall efficiency of the motor. Moreover, the relatively large outer diameter dimension of the stator lamination 12 can expand the surface area of the stator core 100 without increasing the thickness, which is beneficial to heat dissipation and improves the thermal management effect of the motor. For example, the outer diameter of the stator lamination 12 can be 160 mm, 180 mm, 200 mm, 210 mm, and 230 mm, but not limited thereto.

[0058] According to some alternative embodiments of the present invention, as shown in Figure 3 、 Figures 4-7 , N solder joints 14 between two adjacent stator lamination stacks 10 are evenly distributed in the circumferential direction of the stator lamination stack 10.

[0059] With the above arrangement, the N solder joints 14 can be evenly stressed circumferentially along the stator core 100 between two adjacent stator lamination groups 10, avoiding the problem of local stress concentration, being beneficial to extending the service life of the stator core 100, reducing damage caused by local fatigue, preventing the risk of warping or bending in a local area due to the lack of sufficient fixing points, and ensuring the overall flatness of the stator core 100; moreover, the evenly distributed solder joints 14 can keep the magnetic flux path of the stator core 100 consistent, reduce magnetic field distortion, thereby improving the efficiency and performance of the motor, and can also avoid forming a large closed loop, thus reducing eddy current losses; the evenly distributed solder joints 14 can also form more heat conduction paths on the entire stator core 100, promoting the uniform diffusion of heat and reducing the risk of local overheating. In addition, during the stacking process of the stator lamination groups 10, the evenly distributed solder joints 14 or connection points can help the operator more easily align each section of the stator lamination groups 10, ensuring that they are consistent both radially and axially, contributing to improving the assembly accuracy and reducing error accumulation.

[0060] According to some alternative embodiments of the present invention, in combination with Figures 1-4 As shown, a plurality of weld grooves 11 are provided on the outer peripheral surface of the N stator lamination groups 10. The plurality of weld grooves 11 extend along the axial direction of the stator core 100, and the plurality of weld grooves 11 are spaced apart on the outer periphery of the stator lamination groups 10. The N solder joints between two adjacent stator lamination groups 10 are respectively arranged in the plurality of weld grooves 11.

[0061] Among them, the weld grooves 11 can reserve welding space for the solder joints 14, increase the welding contact area between the solder joints 14 and the stator lamination groups 10, improve the welding strength, and can also prevent the solder joints 14 from protruding beyond the edge of the outer peripheral surface of the stator lamination groups 10, thereby affecting the surface flatness of the stator lamination groups 10 in its own circumferential direction, reducing eddy current losses, and ensuring the motor performance. Moreover, the N solder joints 14 between two adjacent stator lamination groups 10 are respectively arranged in the plurality of weld grooves 11, so that the stress distribution uniformity of the solder joints 14 in the circumferential direction of the stator lamination groups 10 can be improved, thereby ensuring its service life, and arranging the solder joints 14 uniformly in the weld grooves 11 is beneficial to improving the regularity of the solder joints 14.

[0062] Specifically, in combination with Figures 5-7As shown, a plurality of weld grooves 11 are evenly distributed in the circumferential direction of the stator punching set 10. Such an arrangement can effectively disperse mechanical stress, avoid local stress concentration, and improve the uniformity of stress distribution. It can also help balance the mass distribution of the stator core 100, reduce vibration during motor operation, thereby reducing noise and extending the service life. Moreover, the evenly distributed design helps the stator core 100 achieve a smoother rotational motion, avoid additional stress and wear caused by imbalance, and is also convenient for the operation of automated production equipment, simplifies the production process, and improves production efficiency and consistency.

[0063] Furthermore, as shown in combination with Figure 1 , Figure 2 and Figure 5 , a rib 111 protruding towards the groove opening is formed at the bottom of the weld groove 11, and the welding point 14 is arranged on the rib 111. Among them, the rib 111 can increase the actual contact area of the welding surface, and the welding material can better fill and wrap the contact surface, thereby improving the welding strength of the welding point 14. In addition, the rib 111 can guide the flow of the welding material, reduce pores and cracks generated during the welding process, improve the quality of the weld, and the rib 111 can also provide more metal materials for fusion, making the welded joint tighter, reducing the possibility of welding defects, thereby improving the welding fusion effect and further improving the welding quality. For example, the structure of the weld groove 11 is similar to a "W" shape, but is not limited thereto.

[0064] Specifically, as shown in combination with Figure 1 and Figure 3 , since the stator punching sets 10 are stacked and connected along the axial direction of the stator core 100, the welding points 14 in at least one weld groove 11 are evenly distributed along the axial direction of the stator core 100. Such an arrangement can make the connection stress distribution of the plurality of stator punching sets 10 in the axial direction more uniform, avoid the problem of local stress concentration, and thus improve the stress uniformity of the welding points 14 in the axial direction of the stator core 100.

[0065] Furthermore, as shown in combination with Figure 1 and Figure 2 , the number of welding points 14 in two adjacent weld grooves 11 is different. Such an arrangement can, on the basis of ensuring the connection strength between the stator punching sets 10, also flexibly reduce the number of welding points 14, reduce the risk of ablation of the insulating layer of the stator punching 12, reduce the stator iron loss, and thus improve the motor efficiency. For example, the number of welding points 14 in one weld groove 11 is 5, and the number of welding points 14 in another weld groove 11 is 2 (as shown in Figure 1 ); another example is that the number of welding points 14 in one weld groove 11 is 2, and the number of welding points 14 in another weld groove 11 is 3 (as shown in Figure 2 ), etc., but is not limited thereto.

[0066] Specifically, as shown in Figure 2 As shown, the solder joints 14 in two adjacent weld grooves 11 are axially staggered along the stator core 100. With the above arrangement, it can not only make the different stator lamination groups 10 form a connected effect axially along the stator core 100, but also make the different stator lamination groups 10 form a connection relationship at different circumferential positions, so as to take into account the connection effects of different stator lamination groups 10 both axially and circumferentially, and can also effectively reduce the number of solder joints 14, reduce the risk of ablation of the insulation layer of the stator laminations 12, reduce the stator iron loss, and thus improve the motor efficiency.

[0067] According to some alternative embodiments of the present invention, as shown in Figure 4 As shown, the dimension of the solder joint 14 along the axis of the stator core 100 is L1, and the thickness of the stator lamination 12 is D. L1 and D satisfy the relationship: L1≥5D. The solder joint 14 has a relatively large dimension along the axis of the stator core 100. In this way, a larger contact area can be provided, the connection strength between the solder joint 14 and the stator lamination 12 can be enhanced, and the risk of loosening or falling off of the solder joint 14 due to vibration or mechanical stress during the operation of the motor can be prevented, thereby improving the connection firmness between the stator lamination groups 10; the solder joint 14 with a larger dimension can better disperse stress and avoid local stress concentration, thereby improving the structural stability and fatigue resistance of the entire stator core 100; the larger dimension of the solder joint 14 can provide stronger support force along the axis of the stator core 100, reduce warping and bending phenomena caused by external loads or internal stresses, and ensure the overall flatness and rigidity of the stator core 100; the larger dimension of the solder joint 14 can provide more heat conduction paths, help transfer heat from the heat-generating part (such as the winding) to the external environment, contribute to reducing the risk of local overheating, and improve the heat dissipation effect of the motor.

[0068] For example, the thickness of the stator lamination 12 is 0.2 mm, 0.3 mm, etc., and the dimension of the solder joint 14 along the axis of the stator core 100 is 1 mm, 1.5 mm, etc., which is not limited thereto.

[0069] According to some alternative embodiments of the present invention, the total number of solder joints 14 of the stator core 100 is N 总 , the axial dimension of the stator core 100 is L, and N 总 satisfies the relationship: 24≤N 总 =N×L / L2≤80. Among them, the above parameter relationship is obtained from experimental verification of empirical data.

[0070] It can be understood that the above relationship can obtain the value of N 总 , that is, the total number of solder joints of the stator core 100 can be obtained, and N 总Restricted within a reasonable range, so that the values of N, L, and L2 can also be flexibly selected according to design requirements (when two values are known, determine the value range of another unknown parameter). With such a design, the stator core 100 can take into account both the firmness of the stator core 100 and the motor efficiency. For example, N 总 can be 24, 30, 50, 60, 80, etc., and is not limited thereto.

[0071] According to some alternative embodiments of the present invention, the number of solder joints 14 between at least two stator punching groups 10 and adjacent stator punching groups 10 is different. With such an arrangement, on the basis of ensuring the connection strength between the stator punching groups 10, the number of solder joints 14 can be flexibly reduced, the ablation risk to the insulating layer of the stator punching 12 can be reduced, and the stator iron loss can be reduced, thereby improving the motor efficiency.

[0072] According to some alternative embodiments of the present invention, the total number of solder joints 14 of the stator core 100 is N 总 , and the theoretical number of solder joints 14 between two adjacent stator punching groups 10 is . In the direction extending from one axial end of the stator core 100 to the other axial end, the number of solder joints 14 between two adjacent stator punching groups 10 is successively , , , ……, . The number of stator punching groups 10 is K; wherein, N 总 = ; 24 ≤ N 总 ≤ 80. Among them, this parameter relationship is obtained from experimental verification of empirical data.

[0073] It can be understood that the above relationship can establish a parameter connection between N 总 , R, L, and N. When N 总 is less than the minimum value of 24, the number of solder joints 14 cannot meet the strength requirements for fixing the stator core 100. When N 总 is greater than the maximum value of 80, the number of solder joints 14 is excessive, which will increase the iron loss of the motor and reduce the motor efficiency.

[0074] In addition, through the above parameter relationship, it is convenient to flexibly select the values of R, L, and N according to design requirements (when two values are known, determine the value range of another unknown parameter). With such a design, the stator core 100 can take into account both the firmness of the stator core 100 and the motor efficiency. For example, N 总 can be 24, 30, 50, 60, 80, etc., and is not limited thereto.

[0075] According to some alternative embodiments of the present invention, in combination with Figures 4-7As shown, a plurality of stator laminations 12 within each stator lamination group 10 are provided with riveting buttons 13 for connection. Among them, during the manufacturing process of the stator core 100, a plurality of stator laminations 12 within each stator lamination group 10 are usually provided with riveting buttons 13 for connection. The riveting buttons 13 and corresponding rivets are used to firmly rivet and connect the plurality of stator laminations 12 together to form an integral stator core 100. For example, riveting buttons are used when the stator laminations 12 are stacked. The number of riveting buttons can be set to 8, 10, 12, 16, 18, 20, etc. according to needs. The specific number is determined according to the stator size and the number of poles of the motor, generally greater than or equal to 8 to ensure the pulling force requirement after the stator core 100 is riveted.

[0076] The above-mentioned riveted connection can effectively prevent the stator laminations 12 from loosening or shifting during operation, ensuring the overall structural stability and mechanical strength of the stator core 100. Moreover, the riveted stator core 100 has higher rigidity and anti-vibration ability and can maintain good performance under high-speed and high-load conditions; the rivets can increase the contact area between the stator laminations 12, reduce the contact resistance, which is beneficial to improving the heat dissipation performance of the motor and reducing the temperature rise; and the reasonably designed layout of the riveting buttons 13 can leave a small gap between the stator laminations 12 to promote air circulation and further enhance the heat dissipation effect.

[0077] Optionally, the riveting buttons 13 are usually distributed on the outer edge or specific internal positions of the stator laminations 12 (for example, evenly distributed along the circumference or concentratedly arranged in key stress areas) to ensure that the entire stator lamination group 10 can obtain uniform fixing force in all directions; according to the size and application requirements of the stator core 100, each stator lamination group 10 may contain multiple riveting buttons 13. Larger motors usually require more riveting buttons 13 to provide sufficient fixing force.

[0078] In addition, the process of riveting different stator laminations 12 to each other is introduced. First, a plurality of stator laminations 12 are accurately stacked together according to the design requirements to ensure that each stator lamination 12 is aligned and the interlayer insulation is maintained; rivets are inserted into the stacked stator lamination group 10 to ensure that each rivet hole has a corresponding rivet; a special riveting device (such as a hydraulic riveting machine or a pneumatic riveting pliers) is used to hammer or press the rivets to deform their heads and tightly combine with the laminations. For the stator laminations 12 with a convex structure, the rivet heads can be directly formed by pressing.

[0079] According to some alternative embodiments of the present invention, a plurality of stator laminations 12 within each stator lamination group 10 are provided with an adhesive for connection, and the adhesive is configured as a layer or dispersed dots.

[0080] Specifically, multiple stator laminations 12 within each stator lamination group 10 are firmly bonded together by an adhesive. This can effectively improve the overall rigidity and vibration resistance of the stator lamination group 10, prevent the stator laminations 12 from loosening or shifting during operation, and the adhesive does not introduce additional metal materials, so no large closed loops are formed, which is beneficial to maintaining the consistency of the magnetic flux path of the stator core 100, reducing magnetic field distortion, and improving the efficiency and performance of the motor.

[0081] Optionally, as shown in Figure 5 the weld grooves 11 and the rivets 13 are arranged at intervals in the circumferential direction of the stator lamination group 10. This can increase the force transmission path between the stator lamination groups 10 in the circumferential direction, thereby enhancing the force uniformity of the stator core 100 in its own circumferential direction, reducing the risk of local stress concentration, and improving the structural firmness of the stator core 100.

[0082] Another option is, as shown in Figure 6 the number of rivets 13 between adjacent weld grooves 11 is different along the circumferential direction of the stator lamination group 10. This can, on the premise of ensuring the firm connection between the stator lamination groups 10, also flexibly adjust the number of rivets 13 according to requirements, thereby reducing eddy current losses and improving the motor performance.

[0083] The stator according to the second aspect embodiment of the present invention includes the stator core 100 of the above embodiment. In this way, the stator with this stator core 100 can, on the premise of ensuring its own firmness, also reduce the problem of large-area ablation caused by the welding process and improve the production beat.

[0084] As shown in Figure 8 the following details the production process flow of the stator core 100: First, use a stamping die to stamp out single-piece stator laminations 12, then stack them axially along the stator laminations 12 to obtain a stator lamination group 10 that meets the dimensional requirements, then use a tooling to assemble each stator lamination group 10, and weld each stator lamination group 10 together at the connection between the stator lamination groups 10 by spot welding to obtain the entire stator core 100. In this way, the iron loss deterioration caused by traditional integral welding can be reduced, the motor efficiency can be improved, and the motor manufacturing cost can be reduced at the same time.

[0085] Among them, the stator core 100 is the stationary part in an electric motor (such as an AC motor, a DC motor, a synchronous motor, and an induction motor), and is usually located inside the motor housing. It is formed by stacking a plurality of thin silicon steel sheets (i.e., stator punching sheets 12), and these silicon steel sheets are stacked and fixed together to form an integral structure. In addition, each stator punching sheet 12 has a tooth-slot structure, where the teeth are used to support the winding and the slots are used to accommodate the winding coils. The three-phase winding is installed in the slots of the stator punching sheet 12, and a rotating magnetic field is generated by passing an electric current. Insulation treatment is required between the stator punching sheets 12 and between the winding and the stator punching sheet 12 to prevent eddy currents and short-circuit phenomena.

[0086] The electric motor according to the third aspect embodiment of the present invention includes the stator of the above embodiment. Thus, the electric motor having such a stator can improve the working efficiency and reduce the manufacturing cost of the electric motor.

[0087] The powertrain according to the fourth aspect embodiment of the present invention includes the electric motor of the above embodiment. Thus, the powertrain having such an electric motor can improve the driving stability and working efficiency, thereby improving the reliability.

[0088] The vehicle according to the fifth aspect embodiment of the present invention includes the powertrain of the above embodiment. Thus, the vehicle having such a powertrain can improve the endurance capacity, reduce the manufacturing cost of the whole vehicle, and thereby enhance the market competitiveness of the vehicle.

[0089] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0090] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0091] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

[0093] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0094] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that, Comprising: A plurality of stator lamination groups, which are stacked axially along the stator core, and each stator lamination group includes a plurality of stator laminations stacked axially along the stator core; Wherein, the dimension of the stator lamination group along the axial direction of the stator core is L2, the number of solder joints between two adjacent stator lamination groups is N, the dimension of the solder joints along the axial direction of the stator core is L1, and the outer diameter of the stator lamination is R. L1, L2, N, and R satisfy the relationship: 0.12 ≤ L1 / L2 ≤ 0.6, and 0.026 ≤ N / R ≤ 0.043, 160 mm ≤ R ≤ 230 mm.

2. The stator core according to claim 1, wherein, L1 and L2 satisfy the relationship: 0.4 ≤ L1 / L2 ≤ 0.

5.

3. The stator core according to claim 1, wherein, N and R satisfy the relationship: 0.028 ≤ N / R ≤ 0.

035.

4. The stator core according to claim 1, wherein, L1 satisfies the relationship: 3 mm ≤ L1 ≤ 6 mm.

5. The stator core according to claim 1, characterized in that, L2 satisfies the relationship: 10 mm ≤ L2 ≤ 25 mm.

6. The stator core according to claim 1, wherein, N satisfies the relationship: 6≤N≤8。 7. The stator core according to claim 1, characterized in that, The N solder joints between two adjacent stator lamination groups are evenly distributed circumferentially on the stator lamination group.

8. The stator core according to claim 1, wherein The outer peripheral surface of the stator lamination group is provided with a plurality of weld grooves, which extend axially along the stator core and are spaced circumferentially on the stator lamination group. The N solder joints between two adjacent stator lamination groups are respectively arranged in the plurality of weld grooves.

9. The stator core according to claim 8, characterized in that, The plurality of weld grooves are evenly distributed circumferentially on the stator lamination group.

10. The stator core according to claim 8, wherein, A rib protruding towards the notch is formed at the bottom of the weld groove, and the solder joint is arranged on the rib.

11. The stator core according to claim 1, characterized in that, The thickness of the stator lamination is D, and L1 and D satisfy the relationship: L1 ≥ 5D.

12. The stator core according to claim 1, characterized in that, The total number of the solder joints of the stator core is N 总 , the axial dimension of the stator core is L, and N 总 satisfies the relation: 24 ≤ N 总 = N × L / L2 ≤ 80.

13. The stator core according to claim 1, characterized in that, The number of solder joints between at least two stator lamination groups and the adjacent stator lamination groups is different.

14. The stator core according to claim 1, wherein The total number of the solder joints of the stator core is N 总 , the theoretical number of solder joints between two adjacent stator punch groups is , in the direction extending from one axial end of the stator core to the other axial end, the numbers of the solder joints between two adjacent stator punch groups are successively , , , ……, , and the number of the stator punch groups is K; Wherein, N 总 = ； 24≤N 总 ≤80。 15. A stator, characterized in that, Comprising: The stator core according to any one of claims 1 - 14.

16. A motor, characterized in that, Comprising: The stator according to claim 15.

17. A powertrain, characterized in that, Comprising: The motor according to claim 16.

18. A vehicle, characterized in that, Comprising: The powertrain according to claim 17.

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