Stator lamination, stator, electric motor and vehicle

Abstract

The present application belongs to the technical field of electric motor equipment. Disclosed are a stator lamination, a stator, an electric motor and a vehicle. The stator lamination comprises a stator yoke portion, connecting portions and a plurality of stator tooth portions. Due to the arrangement of the connecting portions, a plurality of mounting holes are formed between every two adjacent stator tooth portions, and conductors of a stator winding are mounted in the mounting holes. The conductors of the stator winding are separated by the connecting portions, thereby increasing the spacing between the conductors.

Description

A stator lamination, stator, motor and vehicle

[0001] Cross-references to related applications

[0002] This application is based on Chinese Patent Application No. CN202411036122.6, filed on July 31, 2024, and claims priority to that Chinese Patent Application, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of electrical equipment technology, and in particular relates to a stator lamination, a stator, an electric motor, and a vehicle. Background Technology

[0004] With the development of the automotive industry, new energy drive motors have become a key component that various OEMs are focusing on developing, and they are constantly improving the efficiency and performance of motors through alloy improvements.

[0005] As a core component of new energy motors, the stator is a crucial area for continuous innovation for motor developers and stator design engineers to provide a better alternating magnetic field for the entire motor. The stator includes components such as the stator core, stator windings, and stator base. The stator core is formed by stacking multiple stator laminations.

[0006] In related technologies, the stator has poor heat dissipation performance and the stator core is prone to wear and tear. Summary of the Invention

[0007] This application aims to at least partially solve the technical problems of poor stator heat dissipation and easy wear of stator cores in related technologies. To this end, this application provides a stator lamination, a stator, a motor, and a vehicle.

[0008] In a first aspect, an embodiment of this application provides a stator lamination, comprising:

[0009] stator yoke;

[0010] Multiple stator teeth are arranged circumferentially around the stator yoke and connected to the stator yoke;

[0011] A connecting portion is connected to two adjacent stator teeth, such that the stator yoke, the stator teeth, and the connecting portion, as well as the stator teeth and the connecting portion, all form mounting holes for the conductors of the stator winding to pass through.

[0012] Secondly, embodiments of this application also provide a stator, including the stator laminations described in the first aspect above, wherein multiple stator laminations are stacked, and a stator winding is also provided, wherein the conductors of the stator winding pass through the mounting holes.

[0013] Thirdly, embodiments of this application also provide an electric motor, including the stator laminations described in the first aspect or the stator described in the second aspect.

[0014] Fourthly, embodiments of this application also provide a vehicle including the motor described in the third aspect above.

[0015] The present invention has at least the following beneficial effects:

[0016] The stator lamination provided by the present invention includes a stator yoke, a connecting portion, and a plurality of stator teeth. The plurality of stator teeth are circumferentially spaced around the stator yoke and connected to the stator yoke. The connecting portion connects two adjacent stator teeth, such that the stator yoke, stator teeth, and connecting portion, as well as the stator teeth and connecting portion, all form mounting holes for passing through the stator winding.

[0017] With this design, multiple mounting holes are formed between two adjacent stator teeth due to the connection part. The conductors of the stator winding are installed in these mounting holes. The conductors of the stator winding can dissipate heat not only through contact with the stator teeth and stator yoke, but also through contact with the connection part. The heat dissipation effect of the stator winding conductors is better, which can improve the efficiency of the motor.

[0018] In addition, with this design, when the conductors of the stator winding are energized and generate an electromagnetic field, the connection part can act as a magnetic bridge. Because there is a magnetic bridge between different conductors of the stator winding, the electromagnetic field generated by the conductor located on the outside will be transferred in stages through the magnetic bridge, thereby reducing the magnetic flux density distribution of the stator yoke and thus helping to reduce the loss of the stator yoke.

[0019] In addition, this design increases the spacing between conductors by using connecting gaps between the conductors of the stator winding, thereby increasing the process space for welding conductors to the coil ends. This facilitates welding of conductors to the coil ends, helps improve stator production efficiency, and also improves the production process to a certain extent. Attached Figure Description

[0020] 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 accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 shows a schematic diagram of the stator lamination structure when the stator teeth surround the outer periphery of the stator yoke in one or more embodiments of this application.

[0022] Figure 2 shows a schematic diagram of the structure in which a conductor is inserted into the mounting hole of the stator lamination shown in Figure 1.

[0023] Figure 3 shows a schematic diagram of the stator lamination structure when the stator teeth surround the outer periphery of the stator yoke and all mounting holes are closed structures in one or more embodiments of this application.

[0024] Figure 4 shows a schematic diagram of the structure in which a conductor is inserted into the mounting hole of the stator lamination shown in Figure 3.

[0025] Figure 5 shows a schematic diagram of the stator lamination structure when the stator yoke is arranged around the stator teeth in one or more embodiments of this application.

[0026] Figure 6 shows a schematic diagram of the stator core structure formed by stacking stator laminations as shown in Figure 5.

[0027] Figure 7 shows a schematic diagram of the stator structure in one or more embodiments of this application.

[0028] Figure 8 shows the magnetic induction intensity and magnetic field line distribution of the stator lamination shown in Figure 2.

[0029] Figure 9 shows enlarged views of points m1 and m2 in Figure 8 and the state of magnetic induction intensity.

[0030] Figure 10 shows the magnetic induction intensity distribution of the stator laminations shown in Figure 2.

[0031] Figure 11 shows enlarged views of points m1 and m2 in Figure 10 and the magnetic induction intensity status.

[0032] Figure 12 shows the magnetic induction intensity distribution at different circumferential positions of the stator lamination teeth shown in Figure 10.

[0033] Figure 13 shows the magnetic induction intensity and magnetic field line distribution of stator laminations in the prior art.

[0034] Figure 14 shows enlarged views of points m1 and m2 in Figure 13 and the magnetic induction intensity status.

[0035] Figure 15 shows the magnetic flux density distribution in the prior art.

[0036] Figure 16 shows enlarged views of points m1 and m2 in Figure 15 and their magnetic induction states.

[0037] Figure 17 shows the magnetic induction intensity distribution at different circumferential positions of the stator lamination teeth shown in Figure 15.

[0038] Figure 18 shows a comparative diagram of Figures 12 and 17.

[0039] Reference numerals: 1000, stator; 100, stator lamination; 100a, mounting hole; 110, stator yoke; 120, stator teeth; 130, connecting part; 200, stator winding; 210, conductor; 220, end. Embodiments of the present invention

[0040] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0044] With the development of the automotive industry, new energy drive motors have become a key component that various OEMs are focusing on developing, and they are constantly improving the efficiency and performance of motors through alloy improvements.

[0045] As a core component of new energy motors, the stator is a crucial area for continuous innovation for motor developers and stator design engineers to provide a better alternating magnetic field for the entire motor. The stator includes components such as the stator core, stator windings, and stator base. The stator core is formed by stacking multiple stator laminations.

[0046] In related technologies, stator heat dissipation is poor and stator core is prone to wear. This application provides a stator lamination, a stator, a motor, and a vehicle, which can at least partially solve the technical problems of poor stator heat dissipation and easy stator core wear in related technologies.

[0047] The structure of the stator winding 200 is known to those skilled in the art. For ease of understanding, a brief description is provided below: As shown in Figure 7, the stator winding 200 includes a conductor 210 and coil ends 220. The conductor 210, also called the straight side or effective side of the coil, is, as the name suggests, the conductive part of the motor. It is usually made of a good conductor such as copper or aluminum, covered with insulation, and is embedded between the slots formed by two adjacent stator teeth. It is the effective part used to induce electromotive force and generate a magnetic field after energization. Conductors 210 alone cannot form a closed-loop circuit; different conductors 210 must be connected at both ends of the stator core using wires according to a certain pattern to form a circuit. These wires connecting different conductors 210 at the ends are called coil ends 220, or simply ends by those skilled in the art. Usually, the coil ends 220 and the connected conductors 210 are made of the same material. For high-voltage motors, sometimes additional insulating and anti-corona materials are added to the ends to enhance insulation.

[0048] The inventors of this application have discovered through research that:

[0049] When alternating current flows through the stator, the stator windings generate significant heat due to Ohm's law. If this heat exceeds the motor's cooling capacity, the stator winding temperature rises rapidly, and its resistance increases accordingly, affecting motor efficiency. In severe cases, the external insulation of the stator windings may experience a reduced lifespan or even breakdown. Furthermore, when the stator windings are energized, an alternating magnetic field is generated inside the core. The higher the current, the denser the magnetic lines of force. However, due to the nonlinear characteristics of ferromagnetic materials, the increase in magnetic lines of force is not directly proportional to the increase in current. The increase in magnetic lines of force leads to an increase in magnetic reluctance, ultimately increasing core losses and affecting motor efficiency and peak performance.

[0050] As shown in Figures 13 and 14, in related technologies, the slots formed by adjacent stator tooth components all adopt a single-slot design, meaning all conductors within the slot are located in the same slot. This results in only the outermost conductor having good contact with the stator core, while the middle conductors suffer from poor contact and can only dissipate heat through their sides, leading to poor heat dissipation. Simultaneously, the magnetic lines of force generated by all conductors pass through the stator yoke at the bottom of the slot, causing magnetic saturation in the stator yoke. This results in a non-linear increase in magnetic reluctance and increased core losses, affecting efficiency and peak performance. This problem is even more pronounced in external rotor motors.

[0051] Chinese invention patent CN 112290701 A discloses a stator winding coil heat dissipation structure, a stator structure, and a motor. The inventors analyzed the patent and found that while adding connectors to the stator ends improves heat dissipation at the ends, it fails to improve the heat dissipation of the stator core section or the magnetic circuit distribution within the core laminations. Overall, this solution increases the number of components, offers limited improvement in motor heat dissipation, and fails to improve the stator magnetic circuit. Furthermore, the surface insulation of the stator winding is easily damaged during the assembly of the connectors with the stator winding, leading to motor malfunctions. This technical solution uses dedicated connectors to increase heat dissipation at the stator winding ends, but this increases design workload and on-site assembly complexity, failing to effectively solve the heat dissipation problem of the straight section of the stator winding located inside the core. The dedicated connectors at the ends cannot improve the magnetic circuit topology inside the stator, meaning they cannot improve the magnetic circuit distribution, reduce core losses, or further improve motor efficiency by reducing magnetic flux density.

[0052] Chinese invention patent CN 112039233 A discloses an electrically excited flux-switching motor with a radially partitioned stator. The inventors analyzed the patent and found that it discloses a partitioned stator configuration. By partitioning the stator, the excitation stator winding and armature stator winding are rationally allocated, resolving the spatial arrangement conflict problem and improving heat dissipation to some extent. Although this patent creatively partitions the stator, its purpose is to improve the spatial conflict between the excitation stator winding and the armature stator winding. The connection structure between the stator winding and the core laminations still uses a traditional method, with no improvement in the contact area, thus failing to improve the magnetic circuit topology and heat dissipation effect.

[0053] This application is described below with reference to the accompanying drawings and specific embodiments:

[0054] As shown in Figures 1, 3 and 5, the stator lamination 100 includes a stator yoke 110, a connecting portion 130 and multiple stator yokes 110.

[0055] Multiple stator teeth 120 are circumferentially spaced around the stator yoke 110 and connected to the stator yoke 110; a connecting portion 130 is connected to two adjacent stator teeth 120, such that the stator yoke 110, stator teeth 120 and connecting portion 130, as well as the stator teeth 120 and connecting portion 130, all form a mounting hole 100a for the conductor 210 of the stator winding 200 to pass through.

[0056] It should be noted that the stator teeth 120 and the stator yoke 110 are fixedly connected, and a connecting part 130 is provided between each pair of adjacent stator teeth 120. The connecting part 130 is also fixedly connected to the two adjacent stator teeth 120. The structures of the stator yoke 110 and the stator teeth 120 are diverse and are not limited in this application.

[0057] The connecting portion 130 is located between two adjacent connecting portions 130, connecting the two adjacent connecting portions 130 so that the stator yoke portion 110, the stator tooth portion 120, and the connecting portion 130 form a mounting hole 100a, and the stator tooth portion 120 and the connecting portion 130 form a mounting hole 100a. Multiple mounting holes 100a are formed between two adjacent connecting portions 130.

[0058] The connecting part 130 has the function of heat conduction, and the connecting part 130 can provide a shorter closed path for magnetic lines of force, reducing the magnetic resistance of the magnetic line transmission path. The material of the connecting part 130 can be the same as or different from the material of the stator tooth part 120 and the stator yoke part 110, and no limitation is made in this application.

[0059] In some embodiments, the connecting portion 130 is made of the same material as the stator tooth portion 120 and the stator yoke portion 110. The stator yoke portion 110, the stator tooth portion 120 and the connecting portion 130 are integrally formed by punching, which reduces the forming difficulty of the stator lamination 100 and facilitates the processing of the stator lamination 100.

[0060] With this design, the conductor 210 of the stator winding 200 can not only contact the stator teeth 120 and the stator yoke 110 to transfer heat to them for heat dissipation, but also contact the connecting part 130 to transfer heat to it for heat dissipation. This results in better heat dissipation of the stator winding 200 and helps to improve motor efficiency.

[0061] As shown in Figure 16, which illustrates the magnetic flux density diagram in the prior art, six conductors 210 are arranged between two adjacent stator teeth 120. From the side closer to the center to the side farther from the center, the six conductors 210 are defined as the first conductor 210, the second conductor 210, ..., the sixth conductor 210. It can be seen that, except for the first conductor 210 which has three sides in thermal contact with the stator teeth 120 and the stator yoke 110, the other conductors 210 only have two sides in contact with the stator teeth 120. In this scheme, as shown in Figure 11, which is an enlarged view of points m1 and m2 in Figure 10, six conductors 210 are arranged between two adjacent stator teeth 120, and two conductors 210 are arranged in each mounting hole 100a. It can be seen that, except for the sixth conductor 210 which has only two sides in thermal contact with the stator teeth 120, the first to fifth conductors 210 all have three sides in thermal contact with the stator teeth 120, the stator yoke 110, and the connecting part 130. It can be seen that, with this design, the setting of the connecting part 130 increases the heat dissipation area of ​​the conductors 210, which helps to improve the heat dissipation effect of the stator winding 200.

[0062] In addition, with this design, after the stator winding 200 is energized and generates an electromagnetic field, the connecting part 130 can act as a magnetic bridge. Since there is a magnetic bridge between the different conductors 210 of the stator winding 200, the electromagnetic field generated by the outer conductor 210 will be transferred in stages through the connecting part 130, thereby reducing the magnetic flux density distribution of the stator yoke 110 and thus helping to reduce the loss of the stator yoke 110.

[0063] As shown in Figures 8, 9, 10, and 11, Figure 8 shows the magnetic field strength of the stator lamination 100 shown in Figure 2; Figure 9 shows enlarged views of points m1 and m2 in Figure 8; Figure 10 shows the magnetic flux density of the stator lamination 100 shown in Figure 2; and Figure 11 shows enlarged views of points m1 and m2 in Figure 10. After the connecting portion 130 is provided, the electromagnetic field flows through the two connecting portions 130 between adjacent stator teeth 120, and the magnetic flux density at points m1 and m2 of the stator yoke 110 is significantly reduced, i.e., the saturation level is improved. As shown in Figures 13, 14, 15, and 16, Figure 13 shows the magnetic field strength diagram of the stator lamination 100 in the prior art, Figure 14 shows an enlarged view of points m1 and m2 in Figure 13, Figure 15 shows the magnetic flux density diagram in the prior art, and Figure 16 shows an enlarged view of points m1 and m2 in Figure 15. In the prior art, the electromagnetic field cannot flow in stages, and the magnetic flux and magnetic field strength at points m1 and m2 of the stator yoke 110 are significantly greater than those in this application. Therefore, the connecting part 130 can act as a magnetic bridge, reducing the magnetic flux density and saturation of the stator yoke 110, thereby reducing the losses of the stator yoke 110. Simultaneously, the magnetic field component flowing through the connecting part 130 also reduces the loop reluctance due to the shortened magnetic circuit, improving motor efficiency and peak performance.

[0064] In Figure 12, the horizontal axis represents distance, and the vertical axis represents magnetic flux density. This distance represents the distance from any point on the straight line indicated by the arrow in Figure 12 to point O. Similarly, in Figure 17, the horizontal axis represents distance, and the vertical axis represents magnetic flux density. This distance represents the distance from any point on the straight line indicated by the arrow in Figure 14 to point O. Referring to Figure 18, which compares the dashed line in Figure 12 with the solid line in Figure 17, it can be seen that with this design, the magnetic flux density at all points on the edge of the stator tooth 120 away from the stator yoke 110 is greater than that of the prior art. Integrating the magnetic flux density with the horizontal axis distance and multiplying it by the core height yields the magnetic flux of the tooth. This means that the magnetic flux of the stator tooth is improved compared to the prior art, thereby enhancing the electromagnetic load capacity and performance of the motor.

[0065] In addition, with this design, the conductors 210 are spaced apart by the connecting part 130, thus increasing the spacing between the conductors 210 and the coil end 220. This increases the process space for welding the conductors 210 and the coil end 220, making it easier to weld the conductors 210 and the coil end 220, and helping to improve the production efficiency of the stator.

[0066] The shape of the mounting hole 100a is not limited in this application. The shape of the mounting hole 100a is related to the shape of the conductor 210. In some embodiments of the application, the cross-section of the conductor 210 is rectangular. In these embodiments, the mounting hole 100a is a rectangular hole.

[0067] As shown in Figures 1 to 5, in some embodiments, a plurality of mounting holes 100a between two adjacent stator teeth 120 are arranged sequentially along the radial direction of the stator laminations 100.

[0068] The number of connecting portions 130 between two adjacent stator teeth 120 can be one or more, and is not limited in this application. As shown in Figures 1 and 5, in some embodiments, two connecting portions 130 are provided between two adjacent stator teeth 120. As shown in Figure 4, in some embodiments, three connecting portions 130 are provided between two adjacent stator teeth 120.

[0069] In some embodiments, there are two or more connecting portions 130 between two adjacent stator teeth 120, and the dimensions of the multiple connecting portions 130 are consistent along the radial direction of the stator lamination 100.

[0070] Taking the structure shown in Figure 9 as an example, the inventors of this application have also discovered that the magnetic flux and magnetic field strength of the connecting portion 130 (i.e., the connecting portion 130 between the fourth conductor 210 and the fifth conductor 210) which is far from the stator yoke 110 are larger. This is because the magnetic circuit characteristics are always transmitted along the shortest path, and the magnetic circuit passing through the connecting portion 130 is the shortest. Therefore, the magnetic flux and magnetic field strength of the connecting portion 130 between the fourth conductor 210 and the fifth conductor 210 are larger. The inventors of this application have experimentally discovered that regardless of whether the size of the connecting portion 130 between the fourth conductor 210 and the second conductor 210 (hereinafter referred to as the first connecting portion 130) is larger or smaller than the size of the connecting portion 130 between the second conductor 210 and the third conductor 210 (hereinafter referred to as the second connecting portion 130), the magnetic flux density of the first connecting portion 130 is greater than that of the second connecting portion 130. In other words, the size relationship between the first connecting portion 130 and the second connecting portion 130 does not affect the magnetic flux density of the first connecting portion 130.

[0071] The inventors discovered that the dimensions of the first connecting portion 130 and the second connecting portion 130 affect the heat dissipation effect of the stator winding. In these embodiments, the dimensions of the multiple connecting portions 130 are consistent along the radial direction of the stator lamination 100, which helps to ensure the uniformity of heat dissipation of each conductor 210 and helps to improve motor efficiency.

[0072] The inventors of this application have found that the size of the connecting part 130 is related to the performance of the motor, and the performance of each motor is different. Therefore, the specific size of the connecting part 130 can be adapted by the user according to the requirements of the motor performance, and is not limited in this application.

[0073] In some embodiments, the size of the stator yoke 110 is larger than the size of the connecting portion 130 along the radial direction of the stator lamination 100.

[0074] The size of the stator yoke 110 is larger than that of the connecting part 130 to ensure the mechanical strength of the stator yoke 110 and reduce the deformation of the stator lamination 100.

[0075] In some embodiments of this application, the stator yoke 110 has a size of 4 mm along the radial direction of the stator lamination 100, and the connecting portion 130 has a size of 2 mm.

[0076] In some embodiments, the mounting hole 100a is sized to accommodate two conductors 210.

[0077] One conductor 210 can be placed inside the mounting hole 100a, but placing only one conductor 210 can easily lead to wasted space within the mounting hole 100a. Setting up two or more conductors 210 can result in poor heat dissipation for the middle conductor 210. The mounting hole 100a is sized to accommodate two conductors 210 and 200, allowing each conductor 210 to dissipate heat from three sides. This ensures effective heat dissipation for both conductors 210 and 200, reduces wasted space within the mounting hole 100a, and facilitates the implementation of layered welding processes.

[0078] In some embodiments, the outer surface of the conductor 210 is in thermal contact with the wall of the mounting hole 100a.

[0079] The outer surface of conductor 210 is in thermal contact with the wall of mounting hole 100a so that the heat on conductor 210 can be transferred to the wall of mounting hole 100a so that conductor 210 can dissipate heat.

[0080] It should be noted that the side of conductor 210 that is in contact with the adjacent conductor 210 is called the inner side, and all other sides of conductor 210 except for the inner side are called the outer side.

[0081] As shown in Figure 4, the cross-section of conductor 210 is rectangular, and each conductor 210 has four sides. The first conductor 210 to the sixth conductor 210 each have three outer sides and one outer side. The three outer sides are in thermal contact with the hole wall of the mounting hole 100a.

[0082] As shown in Figures 1 and 5, in some embodiments, the mounting hole 100a away from the stator yoke 110 has an opening. In these embodiments, after the conductor 210 is installed in the mounting hole 100a, the opening is usually filled with a thermally conductive and insulating material and the opening is sealed to ensure the heat dissipation effect of the conductor 210 in the mounting hole 100a.

[0083] As shown in Figures 1 and 5, in some embodiments, two connecting portions 130 are provided, and the two connecting portions 130 form three mounting holes 100a. The mounting holes 100a away from the stator yoke 110 have openings.

[0084] As shown in Figure 3, in some embodiments, each mounting hole 100a is a closed structure. In these embodiments, each mounting hole 100a has no opening and is a closed structure.

[0085] As shown in Figure 3, in some embodiments, three connecting parts 130 are provided, and the three connecting parts 130 form three mounting holes 100a, each mounting hole 100a being a closed structure.

[0086] The stator yoke 110 is disposed around the outer periphery of the stator tooth 120, or the stator yoke 110 is disposed around the inner periphery of the stator tooth 120.

[0087] Figure 5 shows the structure in which the stator yoke 110 surrounds the outer periphery of the stator tooth 120. Figures 1 and 3 show the structure in which the stator yoke 110 surrounds the inner periphery of the stator tooth 120.

[0088] In summary, with this design, the conductors 210 of the stator winding 200 can not only contact the stator teeth 120 and the stator yoke 110 to transfer heat to them for heat dissipation, but also contact the connecting portion 130 to transfer heat to it for heat dissipation. This results in better heat dissipation of the stator winding 200, which helps improve motor efficiency. Furthermore, with this design, after the stator winding 200 is energized and generates an electromagnetic field, the connecting portion 130 can act as a magnetic bridge. Because a magnetic bridge exists between the different conductors 210 of the stator winding 200, the electromagnetic field generated by the outer conductor 210 will be distributed in stages through the connecting portion 130, thereby reducing the magnetic flux density distribution of the stator yoke 110 and helping to reduce the losses of the stator yoke 110. In addition, with this design, the conductors 210 are spaced apart by the connecting part 130, thus increasing the spacing between the conductors 210 and the coil end 220. This increases the process space for welding the conductors 210 and the coil end 220, making it easier to weld the conductors 210 and the coil end 220, and helping to improve the production efficiency of the stator.

[0089] Based on the same inventive concept, this application also provides a stator core, including multiple stator laminations 100 as described above, which are stacked together. Specifically, multiple stator laminations 100 are stacked to form a stator core.

[0090] As shown in Figure 7, based on the same inventive concept, this application embodiment also provides a stator 1000, including multiple stator laminations 100 as described above, the multiple stator laminations 100 being stacked, and also including a stator winding 200, the conductors 210 of the stator winding 200 being inserted into the mounting holes 100a.

[0091] Specifically, multiple stator laminations 100 are stacked to form a stator core. As mentioned above, the stator winding 200 also includes coil ends 220, which connect different conductors 210.

[0092] Since the stator includes the stator lamination 100 described above in this application, it naturally possesses all the beneficial effects of the stator lamination 100 of this application, which will not be elaborated here.

[0093] Based on the same inventive concept, this application also provides an electric motor, including the stator lamination 100 or the stator 1000 described above.

[0094] The motor can be a hub motor, an external motor, etc.

[0095] Since the motor includes the stator lamination 100 described above in this application, it naturally possesses all the beneficial effects of the stator lamination 100 of this application, which will not be elaborated here.

[0096] Based on the same inventive concept, this application also provides a vehicle including the aforementioned motor. This vehicle can be an electric vehicle.

[0097] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0098] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0099] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1.A stator lamination, comprising: a stator yoke (110) ; a plurality of stator teeth (120), which are circumferentially spaced apart from and connected to the stator yoke (110) ; a connecting portion (130), which is connected to two adjacent stator teeth (120), so that the stator yoke (110), the stator teeth (120) and the connecting portion (130), and the stator teeth (120) and the connecting portion (130) each enclose a mounting hole (100a) for a conductor (210) of a stator winding (200). 2.The stator lamination of claim 1, wherein a plurality of connecting portions (130) are provided between two adjacent stator teeth (120), and the connecting portions (130) are of the same size in the radial direction of the stator lamination (100). 3.The stator lamination of claim 1, wherein the stator yoke (110) is of a size greater than that of the connecting portion (130) in the radial direction of the stator lamination (100). 4.The stator lamination of claim 1, wherein the mounting hole (100a) is sized to accommodate two conductors (210). 5.The stator lamination of claim 4, wherein the outer sides of the conductors (210) are in thermal contact with the hole wall of the mounting hole (100a). 6.The stator lamination of claim 1, wherein each mounting hole (100a) is of a closed structure. 7.The stator lamination of claim 1, wherein the stator yoke (110) is circumferentially surrounded by the stator teeth (120), or the stator teeth (120) are circumferentially surrounded by the stator yoke (110). 8.A stator, comprising a plurality of stator laminations (100) as claimed in any one of claims 1-7, which are stacked, and further comprising a stator winding (200), wherein the conductors (210) of the stator winding (200) are arranged in the mounting holes (100a). 9.An electric machine, comprising the stator lamination (100) of any one of claims 1-7 or the stator (1000) of claim 8. 10.A vehicle, comprising the electric machine of claim 9.

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