Stator core, stator assembly, motor and vehicle
By designing discontinuous welds on the stator core and setting them inclined in both the circumferential and axial directions, combined with the connection of bent sections, the problem of high iron loss in the stator core was solved, thereby improving motor performance and reducing noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BYD CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-08-04
AI Technical Summary
The welding method of multiple stator laminations in the stator core leads to high-speed rail loss and affects motor performance.
The design employs discontinuous welds, with the welds inclined along the circumference and axial direction of the stator core and connected by bending sections to increase the weld length and reduce eddy current losses.
It effectively reduces iron loss in the stator core, improves motor performance, reduces operating noise, and enhances modal damping and modal stiffness.
Smart Images
Figure CN224596228U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor technology, and in particular to a stator core, stator assembly, motor and vehicle. Background Technology
[0002] The stator core of an electric motor is usually formed by stacking and welding multiple stator laminations. However, in related technologies, the welding method of multiple stator laminations in the stator core can lead to high iron loss in the stator core, thus affecting the performance of the motor. Utility Model Content
[0003] This application provides a stator core, stator assembly, motor, and vehicle, which reduces the iron loss of the stator core, thereby at least partially solving the above-mentioned technical problems.
[0004] To achieve the above objectives, according to a first aspect of this application, a stator core is provided, the stator core comprising a plurality of stator laminations stacked along its axial direction, the outer circumferential surface of the stator core having a plurality of discontinuous welds, the plurality of discontinuous welds being distributed circumferentially along the stator core, the discontinuous welds including a plurality of first welds, the distribution direction of the plurality of first welds of the discontinuous welds being inclined relative to the circumferential and axial directions of the stator core.
[0005] Optionally, in the circumferential direction of the stator core, two adjacent first welds of the discontinuous weld partially overlap.
[0006] Optionally, the first weld includes a plurality of bent segments connected sequentially along the axial direction of the stator core.
[0007] Optionally, the bent section includes two sub-segments connected sequentially along the axial direction of the stator core, the two sub-segments being arranged at an included angle.
[0008] Optionally, the sub-segment is inclined in both the circumferential and axial directions relative to the stator core.
[0009] Optionally, the angle of inclination of the segment relative to the axial direction of the stator core is θ1, where 20°≤θ1≤70°.
[0010] Optionally, the length of the bent section in the circumferential direction of the stator core is a, where 2mm ≤ a ≤ 8mm.
[0011] Optionally, the width of the bent section in the axial direction of the stator core is b, wherein 1.5mm≤b≤5.5mm.
[0012] Optionally, the distribution direction of the plurality of first welds of the discontinuous weld is tilted at an angle of θ2 relative to the axial direction of the stator core, wherein 10°≤θ2≤85°.
[0013] Optionally, in the circumferential direction of the stator core, the minimum distance between two adjacent first welds is c, where c ≥ 0.5 mm.
[0014] Optionally, the depth of the first weld is greater than or equal to 0.3 mm and less than or equal to 1.5 mm.
[0015] Optionally, the width of the first weld is greater than or equal to 0.3 mm and less than or equal to 1 mm.
[0016] Optionally, the number of the plurality of first welds of the discontinuous weld is n, and the length of the stator core along its axial direction is L, wherein L / n≥5mm.
[0017] Optionally, the distribution direction of the plurality of first welds of two adjacent discontinuous welds is consistent with the direction of axial inclination relative to the stator core.
[0018] Optionally, the distribution direction of the plurality of first welds of two adjacent discontinuous welds is opposite to the direction of axial inclination of the stator core.
[0019] Optionally, the outer peripheral surface of the stator core is further provided with a second weld, which extends along the axial direction of the stator core and welds together a plurality of stator laminations, and the second weld is located between two adjacent discontinuous welds.
[0020] Optionally, a groove is formed on the outer peripheral surface of the stator core, and at least part of the first weld is located in the groove.
[0021] Optionally, the height of the first weld protruding from the outer peripheral surface of the stator core is less than or equal to the depth of the sinker.
[0022] Optionally, the stator lamination includes a connecting portion, and the connecting portions of the plurality of stator laminations are stacked along the axial direction of the stator core, and the stator core includes connecting holes that penetrate the plurality of connecting portions along its axial direction;
[0023] The outer peripheral surface of the stator core is also provided with a third weld extending along the axial direction of the stator core. The third weld is located at the connection part of the plurality of stator laminations and is used to weld the connection parts of the plurality of stator laminations together.
[0024] According to a second aspect of this application, a stator assembly is provided, comprising:
[0025] The stator core is as described above. The stator core includes a plurality of stator laminations stacked along its axial direction. The outer circumferential surface of the stator core is provided with a plurality of discontinuous welds. The plurality of discontinuous welds are distributed along the circumference of the stator core. The discontinuous welds include a plurality of first welds. The distribution direction of the plurality of first welds of the discontinuous welds is inclined relative to the circumferential and axial directions of the stator core.
[0026] Stator windings are wound around the stator core.
[0027] According to a third aspect of this application, an electric motor is also provided, comprising:
[0028] Stator assembly, wherein the stator assembly is as described above;
[0029] The rotor assembly is rotatably connected to the stator assembly.
[0030] According to a fourth aspect of this application, a vehicle is also provided, including the motor described above.
[0031] The stator core provided in this application embodiment, by arranging multiple first welds of the discontinuous weld seam on the outer circumferential surface along the axial direction of the stator core, can weld together at least two adjacent stator laminations, thereby welding multiple stator cores together. Furthermore, by arranging the distribution direction of the multiple first welds of the discontinuous weld seam inclined along both the circumferential and axial directions of the stator core, the weld seam length of the discontinuous weld seam can be increased, reducing iron loss in the stator core, thereby improving motor performance and reducing additional noise generated during motor operation.
[0032] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of 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.
[0034] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.
[0035] Figure 1 A schematic diagram of the structure of one embodiment of the stator core provided in this application;
[0036] Figure 2A partial schematic side view of one embodiment of the stator core provided in this application;
[0037] Figure 3 A partial view of an embodiment of a discontinuous weld in a stator core provided in this application;
[0038] Figure 4 A schematic diagram of another embodiment of the stator core provided in this application;
[0039] Figure 5 A partial schematic side view of another embodiment of the stator core provided in this application;
[0040] Figure 6 A comparison diagram of magnetic flux density (B) and iron loss (P) curves of a stator core provided in an embodiment of this application and a conventional stator core;
[0041] Figure 7 A comparison diagram of the electric field strength (H) and magnetic flux density (B) curves of the stator core provided in the embodiments of this application and a common stator core;
[0042] Figure 8 A comparison diagram of the frequency response curves of the stator core provided in the embodiments of this application and a common stator core;
[0043] Figure 9 This is a breathing mode shape diagram of a typical stator core.
[0044] Figure 10 Breathing mode shape diagram of the stator core provided in the embodiments of this application;
[0045] Figure 11 This is a schematic diagram of the structure of one embodiment of the vehicle provided in this application.
[0046] Explanation of reference numerals in the attached figures:
[0047] 1-Vehicle; 10-Motor; 11-Stator assembly; 110-Stator core; 111-Stator lamination; 1101-Outer circumferential surface; 1102-End face; 112-Discontinuous weld; 1121-First weld; 1122-Overlapping section; 1123-Bent section; 1124-Sub-segment; 113-Second weld; 114-Slot; 115-Third weld; 116-Connecting part; 117-Connecting hole; 118-Stator slot; X-Circumferential direction; Y-Axial direction; 12-Rotor assembly; 20-Wheel. Detailed Implementation
[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0049] This application provides a stator core, a stator assembly, a motor, and a vehicle. These will be described in detail below.
[0050] Figure 1 This is a schematic diagram of the structure of one embodiment of the stator core provided in this application. Figure 2 This is a partial schematic side view of one embodiment of the stator core provided in this application. Figure 1 and Figure 2 As shown, the stator core 110 includes a plurality of stator laminations 111 stacked along its axial direction Y. The outer peripheral surface 1101 of the stator core 110 is provided with a plurality of discontinuous welds 112. The plurality of discontinuous welds 112 are distributed along the circumferential direction X of the stator core 110 and weld the plurality of stacked stator laminations 111 together.
[0051] The discontinuous weld 112 may include a plurality of first welds 1121, and the distribution direction of the plurality of first welds 1121 of the discontinuous weld 112 is distributed along the circumferential X and axial Y of the stator core 110.
[0052] The stator core 110 provided in this embodiment of the application can be welded together by arranging a plurality of first welds 1121 of the discontinuous welds 112 on the outer peripheral surface 1101 along the axial direction Y of the stator core 110 and using them to weld together at least two adjacent stator laminations 111. Furthermore, by distributing the plurality of first welds 1121 of the discontinuous welds 112 along the circumferential direction X and the axial direction Y of the stator core 110, the weld length of the discontinuous welds 112 can be made longer, thereby reducing eddy currents in the stator core 110, reducing iron losses in the stator core 110, thereby improving the performance of the motor 10 and reducing the additional noise generated by the motor 10 during operation.
[0053] Meanwhile, by discontinuously discontinuous welds 112, the distribution direction of multiple first welds 1121 is distributed along the circumferential X and axial Y of the stator core 110, the modal damping and modal stiffness of the stator core 110 can be improved, thereby effectively reducing the transfer function of the stator core 110 and making the motor 10 quieter.
[0054] The first weld 1121 is arranged along the axial direction Y of the stator core 110 and is used to weld at least two adjacent stator laminations 111 together, so that the discontinuous weld 112 can weld multiple stator laminations 111 together.
[0055] It is understandable that, according to the following formulas (1), (2) and (3), the longer the weld length of the stator core 110, the lower the iron loss of the stator core 110. Compared with the related technology where the weld extends directly along the axial Y of the stator core 110, the embodiments of this application distribute the distribution direction of the multiple first welds 1121 of the discontinuous weld 112 along the circumferential X and axial Y of the stator core 110, which makes the total length of the first welds 1121 in the discontinuous weld 112 longer, thereby making the iron loss of the stator core 110 smaller.
[0056] P los =U 2 / R (1);
[0057] R = ρ * L1 / S (2);
[0058]
[0059] Among them, P los U is the iron loss; U is the induced electromotive force; R is the resistance; ρ is the resistivity; L1 is the weld length; S is the cross-sectional area. The magnetic flux passing through the iron core; dt is the change in magnetic flux passing through the iron core; dt is the duration of the change in magnetic flux passing through the iron core.
[0060] In some embodiments, such as Figure 2 As shown, in the circumferential direction X of the stator core 110, two adjacent first welds 1121 of the discontinuous weld 112 partially overlap. Therefore, the stator laminations 111 welded by the two adjacent first welds 1121 of the discontinuous weld 112 overlap, thus increasing the weld connection strength of the discontinuous weld 112 to the multiple stator laminations 111 of the stator core 110.
[0061] like Figure 2 As shown, the first weld 1121 of the discontinuous weld 112 includes an overlapping segment 1122, which overlaps with the adjacent first weld 1121 in the circumferential X direction of the stator core 110. Specifically, in the axial Y direction of the stator core 110, the ratio of the length of the overlapping segment 1122 to the length of the first weld 1121 is greater than or equal to 0.5, further improving the welding strength of the discontinuous weld 112 to the multiple stator laminations 111 of the stator core 110.
[0062] In some embodiments, such as Figure 3As shown, the first weld 1121 can include a plurality of bent segments 1123 connected sequentially along the axial direction Y of the stator core 110. This allows for a further increase in the length of the first weld 1121, resulting in lower iron loss, higher modal damping, and higher modal stiffness of the stator core 110.
[0063] The bent section 1123 may include two sub-segments 1124 connected sequentially along the axial direction Y of the stator core 110, with the two sub-segments 1124 arranged at an included angle, thereby facilitating the formation of the bent section 1123. Furthermore, the extension direction of at least one sub-segment 1124 may be inclined relative to the circumferential direction X and the axial direction Y of the stator core 110, which is beneficial for improving the welding effect of the bent section 1123 on the multiple stator laminations 111 of the stator core 110.
[0064] In some embodiments, the sub-segment 1124 of the bent section 1123 of the first weld 1121 can be extended along the circumferential X and axial Y of the stator core 110 to increase the length of the sub-segment 1124 and improve the welding effect of the sub-segment 1124 on the multiple stator laminations 111 of the stator core 110.
[0065] Figure 3 A partial view of one embodiment of a discontinuous weld in a stator core provided in this application. (See attached image.) Figure 3 As shown, the sub-segment 1124 of the bent section 1123 of the first weld 1121 is inclined at an angle θ1 along the axial direction Y of the stator core 110, where θ1 can satisfy: 20°≤θ1≤70°. This allows the sub-segment 1124 to weld together a larger number of stator laminations 111 while also having a longer length. This improves the weld connection strength of the multiple stator laminations 111 of the stator core 110, resulting in higher modal stiffness of the stator core 110 while reducing iron loss.
[0066] Among them, the angle θ1 of the sub-segment 1124 of the bending section 1123 of the first weld 1121 inclined along the axial direction Y of the stator core 110 can be 25°, 28°, 30°, 37°, 42°, 50°, 60°, 63°, etc., which can be determined according to the structure of the stator core 110.
[0067] Continue to refer to Figure 3 The length of the bent segment 1123 in the circumferential X direction of the stator core 110 is a, where a can satisfy: 2mm≤a≤8mm, thereby reducing the iron loss of the stator core 110 and increasing the modal stiffness of the stator core 110.
[0068] The length a of the bent section 1123 in the circumferential direction X of the stator core 110 can be 3mm, 4mm, 4.5mm, 5mm, 5.3mm, 5.8mm, 7mm, etc., depending on the structure of the stator core 110.
[0069] Continue to refer to Figure 3 The width of the bent section 1123 in the axial Y direction of the stator core 110 is b, where b can satisfy: 1.5mm≤b≤5.5mm, thereby reducing the iron loss of the stator core 110 and increasing the modal stiffness of the stator core 110.
[0070] The width b of the bent section 1123 in the axial Y direction of the stator core 110 can be 1.7mm, 2mm, 2.5mm, 3mm, 3.3mm, 3.8mm, 4mm, etc., depending on the structure of the stator core 110.
[0071] like Figure 3 As shown, the distribution direction of the multiple first welds 1121 of the discontinuous weld 112 is inclined at an angle θ2 along the axial direction Y of the stator core 110, where θ2 can satisfy: 10°≤θ2≤85°. Therefore, the segment 1124 can weld together a large number of stator laminations 111 while having a relatively long length. This is beneficial for improving the weld connection strength of the multiple stator laminations 111 of the stator core 110, resulting in higher modal stiffness of the stator core 110 while reducing iron loss.
[0072] The distribution direction of the multiple first welds 1121 of the discontinuous weld 112 is inclined at an angle θ2 along the axial direction Y of the stator core 110. The angle can be 15°, 18°, 20°, 37°, 42°, 50°, 60°, 73°, etc., and can be determined according to the structure of the stator core 110.
[0073] In some embodiments, the minimum distance between two adjacent first welds 1121 on the circumferential X direction of the stator core 110 is c, where c can satisfy: c ≥ 0.5 mm. Therefore, a larger minimum distance between two adjacent first welds 1121 reduces the requirements for welding processes and helps lower welding costs. Simultaneously, it also reduces the risk of electrical continuity between two adjacent first welds 1121.
[0074] In some embodiments, the depth of the first weld 1121 may be greater than or equal to 0.3 mm and less than or equal to 1.5 mm, thereby giving the first weld 1121 better welding strength to the plurality of stator laminations 111 of the stator core 110 and reducing the iron loss of the stator core 110.
[0075] The depth of the first weld 1121 can be 0.5mm, 0.8mm, 0.9mm, 1mm, 1.3mm, 1.4mm, etc., depending on the structure of the stator core 110.
[0076] In addition, the width of the first weld 1121 can be greater than or equal to 0.3 mm and less than or equal to 1 mm. This will give the first weld 1121 better welding strength to the multiple stator laminations 111 of the stator core 110 and reduce the iron loss of the stator core 110.
[0077] The width of the first weld 1121 can be 0.5mm, 0.8mm, 0.9mm, etc., depending on the structure of the stator core 110.
[0078] In some embodiments, the number of the plurality of first welds 1121 of the discontinuous weld 112 is n, such as Figure 3 As shown, the length of the stator core 110 along its axial direction Y is L, where L and n can satisfy: L / n≥5mm, to avoid an excessive number of first welds 1121, which would lead to excessive welding costs.
[0079] Wherein, the length L of the stator core 110 along its axial direction Y is the distance between the end faces 1102 of the two ends of the stator core 110 along its axial direction Y. The ratio of L to n can be 6, 7, 9, 10, etc., and can be determined according to the structure of the stator core 110.
[0080] It should be noted that in the embodiments of this application, one or more parameters among a, b, θ1, θ2, L, n, the depth and width of the first weld 1121 can satisfy the above requirements, or all parameters can satisfy the above requirements. When setting the parameters of the first weld 1121 of the stator core 110, the parameters such as a, b, θ1, θ2, L, n, the depth and width of the first weld 1121 can be input into the simulation system according to the structure of the stator core 110 to perform eddy current loss simulation and vibration (frequency response) simulation of the stator core 110, and determine the specific values of the parameters such as a, b, θ1, θ2, L, n, the depth and width of the first weld 1121 when the iron loss of the stator core 110 is minimized and the modal stiffness and modal hardness are maximized.
[0081] Among them, the evaluation of modal damping can be indirectly obtained by comparing frequency response functions, the evaluation of modal stiffness can be obtained by comparing natural frequencies, and eddy current loss can be obtained by evaluating the weighted values of iron loss at different frequencies. By comprehensively considering the weighted loss values, modal damping, and modal frequencies, a stator core 110 that meets specific performance indicators can be obtained.
[0082] Figure 6A comparison chart of magnetic flux density (B) and iron loss (P) curves between the stator core provided in this embodiment and a conventional stator core. Figure 6 As shown, the horizontal axis represents magnetic flux density (B), and the vertical axis represents iron loss (P). The solid line represents the magnetic flux density (B) and iron loss (P) curves of a conventional stator core 110, while the dashed line represents the magnetic flux density (B) and iron loss (P) curves of the stator core 110 provided in this embodiment. Figure 6 It can be seen that the iron loss of the stator core 110 provided in this application embodiment is significantly reduced compared with that of the ordinary stator core 110.
[0083] Figure 7 A comparison diagram of the electric field strength (H) and magnetic flux density (B) curves of the stator core provided in the embodiments of this application and a conventional stator core. Figure 7 As shown, the horizontal axis represents the electric field strength (H), and the vertical axis represents the magnetic flux density (B). The solid line represents the electric field strength (H) and magnetic flux density (B) curves of a typical stator core 110, while the dashed line represents the electric field strength (H) and magnetic flux density (B) curves of the stator core 110 provided in this embodiment. Figure 7 It can be seen that the magnetic flux density (B) of the stator core 110 provided in this embodiment is significantly improved compared to that of a conventional stator core 110. Under the same magnetic flux density (B), the current of the stator core 110 provided in this embodiment can be reduced by 23%, and the iron loss can be reduced by 8%.
[0084] Figure 8 A comparison diagram of the frequency response curves of the stator core provided in the embodiments of this application and a common stator core. Figure 9 This is the breathing mode shape diagram of a typical stator core. Figure 10 This is a breathing mode shape diagram of the stator core provided in an embodiment of this application. Since the breathing modes of the stator core 110 comprehensively reflect the overall stiffness of the structure, the vibration response under this mode is the focus of this study. Figures 8 to 10 As shown, under the breathing mode vibration mode, the modal frequency of the ordinary stator core is 3864Hz, while the modal frequency of the stator core 110 provided in this application embodiment is 4306Hz, which is 11% higher than that of the ordinary stator core.
[0085] Under the breathing mode vibration mode, the acceleration of the ordinary stator core is 27.48 m / s². 2 The stator core 110 provided in this embodiment has an acceleration of 22.5 m / s². 2 The modal damping of the stator core 110 provided in this application embodiment is improved by 26% compared with that of ordinary stator cores.
[0086] In some embodiments, such as Figure 1 and Figure 2As shown, the distribution direction of multiple first welds 1121 of two adjacent discontinuous welds 112 can be made consistent along the axial direction Y of the stator core 110, so that more discontinuous welds 112 can be provided on the outer peripheral surface 1101 of the stator core 110, thereby improving the welding strength of multiple stator laminations 111 of the stator core 110 and reducing the iron loss of the stator core 110.
[0087] Of course, such as Figure 4 and Figure 5 As shown, the distribution directions of the multiple first welds 1121 of two adjacent discontinuous welds 112 can also be opposite along the axial direction Y of the stator core 110, which can also improve the welding strength of the stator core 110 to a certain extent and reduce the iron loss of the stator core 110.
[0088] Furthermore, a second weld 113 may be provided on the outer peripheral surface 1101 of the stator core 110. The second weld 113 extends along the axial direction Y of the stator core 110 and welds multiple stator laminations 111 together. The second weld 113 is located between two adjacent discontinuous welds 112, thereby further improving the welding strength of the multiple stator laminations 111 of the stator core 110.
[0089] In some embodiments, such as Figure 3 As shown, a countersunk groove 114 can be formed on the outer peripheral surface 1101 of the stator core 110, and at least part of the first weld 1121 is located within the countersunk groove 114. This reduces the height of the first weld 1121 protruding from the outer peripheral surface 1101 of the stator core 110, thus affecting the assembly accuracy of the stator core 110.
[0090] In some embodiments, the height of the first weld 1121 protruding from the outer peripheral surface 1101 of the stator core 110 can be less than or equal to the depth of the countersink 114. As a result, the first weld 1121 can be completely contained within the countersink 114, further reducing the impact of the first weld 1121 on the assembly accuracy of the stator core 110.
[0091] Specifically, there are multiple sinks 114, and the distribution direction of the multiple sinks 114 is consistent with the distribution direction of the multiple first welds 1121 of the discontinuous weld 112. The multiple sinks 114 are connected in sequence so that the multiple first welds 1121 of the discontinuous weld 112 are located in the multiple sinks 114.
[0092] like Figure 1As shown, the stator lamination 111 includes a connecting portion 116. Multiple stator laminations 111 with connecting portions 116 are stacked along the axial direction Y of the stator core 110. The stator core 110 includes connecting holes 117 that extend through the multiple connecting portions 116 along its axial direction Y. Thus, a connector can be passed through the connecting hole 117 to connect the connector to the stator core 110.
[0093] The stator core 110 may be provided with a third weld 115 extending along the axial direction Y of the stator core 110 on its outer peripheral surface 1101. The third weld 115 is located at the connecting portion 116 of the plurality of stator laminations 111 and is used to weld the connecting portions 116 of the plurality of stator laminations 111 together. This further improves the welding strength of the plurality of stator laminations 111 of the stator core 110.
[0094] Specifically, the stator lamination 111 includes multiple connecting portions 116, which are sequentially distributed along the axial direction Y of the stator core 110. There are multiple third welds 115, and each of the multiple third welds 115 corresponds one-to-one with a connecting portion 116 of the stator lamination 111.
[0095] This application also provides a stator assembly, which includes a stator core. The specific structure of the stator core is as described in the above embodiments. Since this stator assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0096] The stator assembly 11 includes a stator core 110 and a stator winding (not shown in the figure). The stator winding is wound around the stator core 110. The structure of the stator core 110 can be referred to in the above embodiments, and will not be repeated here.
[0097] like Figure 1 As shown, the stator core 110 has multiple stator slots 118 on its inner side. The multiple stator slots 118 penetrate the stator core 110 along the axial direction Y and are distributed sequentially along the circumferential direction X of the stator core 110. The stator winding is wound in the multiple stator slots 118 of the stator core 110.
[0098] This application also provides an electric motor, which includes a stator assembly. The specific structure of the stator assembly is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0099] Among them, such as Figure 11 As shown, the motor 10 includes a stator assembly 11 and a rotor assembly 12. The rotor assembly 12 is rotatably connected to the stator assembly 11. The stator assembly 11 can refer to the above embodiments, and will not be described again here.
[0100] This application also provides a vehicle, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0101] Among them, such as Figure 11 As shown, the motor 10 can be used to drive the wheels 20 of the vehicle 1 to rotate. The vehicle 1 can be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit it.
[0102] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0103] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0104] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0105] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A stator core characterized by, The stator core includes a plurality of stator laminations stacked along its axial direction. The outer circumferential surface of the stator core is provided with a plurality of discontinuous welds. The plurality of discontinuous welds are distributed along the circumference of the stator core. The discontinuous welds include a plurality of first welds. The distribution direction of the plurality of first welds of the discontinuous welds is distributed along both the circumference and axial direction of the stator core.
2. The stator core of claim 1, wherein In the circumferential direction of the stator core, two adjacent first welds of the discontinuous weld partially overlap.
3. The stator core of claim 1, wherein, The first weld includes a plurality of bent segments connected sequentially along the axial direction of the stator core.
4. The stator core of claim 3, wherein The bent section includes two sub-segments connected sequentially along the axial direction of the stator core, and the two sub-segments are arranged at an included angle.
5. The stator core of claim 4, wherein, The segment extends along the circumferential and axial directions of the stator core.
6. The stator core of claim 5, wherein The angle at which the sub-segment is inclined along the axial direction of the stator core is θ1, where 20°≤θ1≤70°.
7. The stator core of claim 3, wherein The length of the bent section in the circumferential direction of the stator core is a, where 2mm ≤ a ≤ 8mm.
8. The stator core of claim 3, wherein The width of the bent section in the axial direction of the stator core is b, where 1.5mm ≤ b ≤ 5.5mm.
9. The stator core of any one of claims 1 to 8, wherein, The distribution direction of the plurality of first welds of the discontinuous weld is inclined at an angle θ2 along the axial direction of the stator core, wherein 10°≤θ2≤85°.
10. The stator core of any one of claims 1 to 8, wherein, In the circumferential direction of the stator core, the minimum distance between two adjacent first welds is c, where c ≥ 0.5 mm.
11. The stator core of any one of claims 1 to 8, wherein, The depth of the first weld is greater than or equal to 0.3 mm and less than or equal to 1.5 mm.
12. The stator core of any one of claims 1 to 8, wherein, The width of the first weld is greater than or equal to 0.3 mm and less than or equal to 1 mm.
13. The stator core of any one of claims 1 to 8, wherein, The number of the plurality of first welds of the discontinuous weld is n, and the length of the stator core along its axial direction is L, wherein L / n≥5mm.
14. The stator core of any one of claims 1 to 8, wherein, The distribution direction of the plurality of first welds of two adjacent discontinuous welds is consistent with the axial tilt direction of the stator core.
15. The stator core of any one of claims 1 to 8, wherein, The distribution directions of the plurality of first welds of two adjacent discontinuous welds are opposite to the axial direction of the stator core.
16. The stator core of claim 15, wherein, The outer circumferential surface of the stator core is also provided with a second weld, which extends along the axial direction of the stator core and welds together multiple stator laminations. The second weld is located between two adjacent discontinuous welds.
17. The stator core of any one of claims 1 to 8, wherein, The stator core has a groove on its outer circumferential surface, and at least part of the first weld is located in the groove.
18. The stator core of claim 17, wherein, The height of the first weld protruding from the outer circumference of the stator core is less than or equal to the depth of the sinker.
19. The stator core of any one of claims 1 to 8, wherein, The stator lamination includes a connecting portion, and the connecting portions of the plurality of stator laminations are stacked along the axial direction of the stator core. The stator core includes connecting holes that penetrate the plurality of connecting portions along its axial direction. The outer peripheral surface of the stator core is also provided with a third weld extending along the axial direction of the stator core. The third weld is located at the connection part of the plurality of stator laminations and is used to weld the connection parts of the plurality of stator laminations together.
20. A stator assembly characterized by, include: Stator core, wherein the stator core is the stator core as described in any one of claims 1 to 19; Stator windings are wound around the stator core.
21. An electric machine characterized by include: A stator assembly as claimed in claim 20; A rotor assembly in rotational connection with the stator assembly.
22. A vehicle characterized by An electric machine comprising the electric machine of claim 21.