Motor stator, motor assembly and vehicle

Abstract

This invention discloses a motor stator, a motor assembly, and a vehicle. The motor stator includes: a stator core comprising multiple stator teeth and an annular stator yoke, with stator slots formed between adjacent stator teeth. Each stator slot has two opposing first inner surfaces and two opposing second inner surfaces. The distances between the two second inner surfaces and the adjacent first inner surfaces are L1 and L2, respectively, where L1 > L2. A stator winding includes multiple coils mounted on the stator core. Each coil includes multiple conductor groups, and each coil includes two axial conductors. The multiple conductor groups are arranged circumferentially along the stator core, and each conductor group includes multiple conductors arranged radially along the stator core. The thickness of each conductor group circumferentially along the stator core is L3, where L1 > L3. The motor stator according to this invention improves torque, reduces noise and iron loss, and satisfies the orderly installation of complex coils.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to an electric motor stator, an electric motor assembly, and a vehicle. Background Technology

[0002] In some related technologies, flat wire winding motors mostly use hairpin windings, the process of which includes hairpin winding forming, twisting and flaring, welding, etc. Each process has very complex requirements, and this structure limits the winding method of flat wire, which is not conducive to improving the performance of the motor.

[0003] In other related technologies, flat wire winding motors use a winding structure in which a single layer of conductors is wound in the same layer. That is, multiple conductors in each stator slot are arranged in a row radially. This winding structure results in a larger slot size in the stator teeth, which greatly reduces the motor torque, increases NVH noise and iron loss, and cannot meet the performance requirements of motors under different working conditions or application environments. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a motor stator that improves manufacturing efficiency and yield, and is beneficial for increasing torque, reducing iron loss and noise.

[0005] The present invention also proposes a motor assembly having the above-described motor stator.

[0006] The present invention also proposes a vehicle having the above-described motor assembly.

[0007] According to an embodiment of the present invention, a motor stator includes: a stator core, the stator core including a plurality of stator teeth and an annular stator yoke, the plurality of stator teeth being disposed circumferentially on the inner or outer circumferential surface of the stator yoke, a stator slot being formed between two adjacent stator teeth, each stator slot having two opposing first inner surfaces, and the slot opening of the stator slot having two opposing second inner surfaces, the distances between the two second inner surfaces and the adjacent first inner surfaces being L1 and L2, respectively, where L1 > L2; and a stator winding, the stator winding including multiple [unclear text - likely referring to components mounted on the stator core]. A coil comprising multiple conductor groups, the portion of the multiple conductor groups located within the stator slots forming axial conductors, each coil comprising two axial conductors, and at least one stator slot being located between the two stator slots of the two axial conductors of the same coil, wherein the multiple conductor groups are arranged circumferentially along the stator core, and each conductor group comprises multiple conductors arranged radially along the stator core, the thickness of each conductor group along the circumferential direction of the stator core being L3, and L1 > L3, and the number of conductors included in the multiple conductor groups being equal or unequal.

[0008] According to an embodiment of the present invention, the motor stator adopts an asymmetrical slot structure at the end of the stator teeth, which improves torque, reduces NVH noise and iron loss, and at the same time satisfies the orderly installation of coils including multiple conductor groups, each conductor group including multiple conductors, in the stator slots, avoids mutual interference between multiple conductors, reduces the difficulty of assembly process, and improves production efficiency and yield.

[0009] In addition, the motor stator according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the toothed shoes are provided on the same side of the stator teeth along the circumferential direction, or the stator teeth include first stator teeth and second stator teeth arranged alternately along the circumferential direction, and the toothed shoes are provided on two sides of the first stator teeth along the two sides of the circumferential direction.

[0011] According to some embodiments of the present invention, in the circumferential direction of the stator core, the slot width of the stator tooth is W, and the slot opening width of the stator tooth is L, where 0.5W≤L≤0.9W.

[0012] According to some embodiments of the present invention, the slot width of the stator tooth is greater than the thickness of the conductor.

[0013] According to some embodiments of the present invention, within the stator slot, the conductor's radial dimension along the stator core is greater than its circumferential dimension along the stator core.

[0014] According to some embodiments of the present invention, the coil is a prefabricated coil.

[0015] According to some embodiments of the present invention, each coil includes two axial conductors and two end conductors, and the portions of the multilayer conductor group located at both axial ends of the stator core are formed as the end conductors, which are used to connect the ends of the two axial conductors.

[0016] According to some embodiments of the present invention, a plurality of coils constitute a first coil and a second coil. The end conductor of the first coil includes a first extension and a first connecting section. The first extension extends circumferentially along the stator core, and the first connecting section connects the first extension and the corresponding axial conductor. The end conductor of the second coil includes a second extension and a second connecting section. The second extension extends circumferentially along the stator core, and the second connecting section connects the second extension and the corresponding axial conductor. The first extension is located axially outside the stator yoke, and the second extension is located axially outside the stator teeth.

[0017] According to some embodiments of the present invention, in the axial direction of the stator core, the second extension is located on the side of the first extension away from the stator core.

[0018] According to some embodiments of the present invention, in the first extension, the multiple layers of the conductor group are arranged radially along the stator core, and the plurality of conductors in each layer of the conductor group are arranged axially along the stator core; in the second extension, the multiple layers of the conductor group are arranged axially along the stator core, and the plurality of conductors in each layer of the conductor group are arranged radially along the stator core.

[0019] According to some embodiments of the present invention, the stator winding includes a multi-phase winding, wherein the multiple coils corresponding to each phase winding constitute multiple first coils and multiple second coils, each phase winding includes multiple branches connected in parallel, and each branch corresponding to the same phase winding is connected in series with two coils of the first coil and / or in series with two coils of the second coil.

[0020] According to some embodiments of the present invention, a plurality of conductors located in the same stator slot are connected in series.

[0021] According to some embodiments of the present invention, the number of stator slots is 48, and the number of pole pairs of the motor stator is 6.

[0022] The motor assembly according to an embodiment of the present invention includes a motor stator according to an embodiment of the present invention.

[0023] The vehicle according to an embodiment of the present invention includes a motor assembly according to an embodiment of the present invention.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is an axial view of the motor stator according to some embodiments of the present invention;

[0027] Figure 2 yes Figure 1 A magnified structural diagram of the region between the midline OA and OB;

[0028] Figure 3 This is an axial view of the motor stator according to other embodiments of the present invention;

[0029] Figure 4 yes Figure 3 A magnified structural diagram of the region between the midline OM and ON;

[0030] Figure 5 This is a schematic diagram of the structure of a motor stator according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the stator winding of a motor stator according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the stator winding of a motor stator according to an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the stator core and the first coil of the motor stator according to an embodiment of the present invention;

[0034] Figure 9 This is an axial view of the stator core and the first coil of the motor stator according to an embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram of the structure of the first coil of the motor stator according to an embodiment of the present invention;

[0036] Figure 11 yes Figure 10 The center circle shows an enlarged structural diagram at point C.

[0037] Figure 12 This is a schematic diagram of the structure of the first coil of the motor stator according to an embodiment of the present invention;

[0038] Figure 13This is a schematic diagram of the structure of the second coil of the motor stator according to an embodiment of the present invention;

[0039] Figure 14 yes Figure 13 The enlarged structural diagram at point D is shown in the middle circle.

[0040] Figure 15 This is a schematic diagram of the structure of the second coil of the motor stator according to an embodiment of the present invention;

[0041] Figure 16 This is a schematic diagram of the circuit of the same phase winding according to some embodiments of the present invention;

[0042] Figure 17 This is a schematic diagram of the circuit of the same phase winding according to other embodiments of the present invention;

[0043] Figure 18 This is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0044] Figure label:

[0045] Motor stator 100; Motor assembly 200; Vehicle 300;

[0046] Stator core 10; stator tooth slot 101; slot opening 102; first inner surface 103; second inner surface 104; stator tooth 11; first stator tooth 111; second stator tooth 112; stator yoke 12; tooth shoe 13.

[0047] Stator winding 20; coil 21; conductor group 211; conductor 2111; axial conductor 212; end conductor 213; first coil 22; first extension 221; first connecting section 222; second coil 23; second extension 231; second connecting section 232. Detailed Implementation

[0048] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] In the description of this invention, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "above," "over," and "on top" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0051] The motor stator 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0052] Reference Figures 1-9 As shown, the motor stator 100 according to an embodiment of the present invention may include: a stator core 10 and a stator winding 20.

[0053] Specifically, the stator core 10 includes a stator yoke 12 and stator teeth 11. The stator yoke 12 is annular, and there are multiple stator teeth 11 distributed circumferentially along the stator yoke 12 and located on the inner circumferential surface of the stator yoke 12 for use with an inner rotor motor. In other words, the outer end of each stator tooth 11 along the radial direction of the stator core 10 is connected to the inner circumferential surface of the stator yoke 12, and the inner ends of the multiple stator teeth 11 can define a stator hole coaxial with the stator yoke 12. Alternatively, the multiple stator teeth 11 are located on the outer circumferential surface of the stator yoke 12 for use with an outer rotor motor. In other words, the inner end of each stator tooth 11 along the radial direction of the stator core 10 is connected to the outer circumferential surface of the stator yoke 12.

[0054] The stator yoke 12 provides mechanical support for a plurality of stator teeth 11, thereby fixing the position of the stator teeth 11. In some embodiments, the stator teeth 11 may be integrally formed on the stator yoke 12.

[0055] The specific structure of the motor stator 100 is described below with the stator tooth portion 11 located on the inner peripheral surface of the stator yoke portion 12 as an example. Based on the following description, the embodiment in which the stator tooth portion 11 is located on the outer peripheral surface of the stator yoke portion 12 will be understood by those skilled in the art.

[0056] like Figures 1-4 As shown, a stator tooth groove 101 is formed between two adjacent stator tooth portions 11. Each stator tooth groove 101 has two first inner surfaces 103 facing each other. The slot opening 102 of the stator tooth groove 101 has two second inner surfaces 104 facing each other. The distances between the two second inner surfaces 104 and the adjacent first inner surfaces 103 are L1 and L2, respectively, and L1 > L2, so that the slot opening 102 is formed as an asymmetrical structure relative to the stator tooth groove 101.

[0057] For example, in some embodiments, one end of a first inner surface 103 (such as the inner end corresponding to an inner rotor motor, or the outer end corresponding to an outer rotor motor) is provided with a toothed shoe 13, the end face of which is formed as a second inner surface 104; the end of another first inner surface 103 is not provided with a toothed shoe 13, and the first inner surface 103 on this side is coplanar with the second inner surface 104, and the toothed shoe 13 and the other first inner surface 103 form a slot 102 for a stator tooth groove 101. Thus, the toothed shoe 13 corresponding to each stator tooth groove 101 is formed as an asymmetrical structure, and the width of the slot 102 for a stator tooth groove 101 is smaller than the groove width of the stator tooth groove 101. In other words, in two adjacent stator tooth portions 11, one side is provided with a toothed shoe 13 and the other side is not provided with a toothed shoe 13, so that the slot 102 for a stator tooth groove 101 is formed between the toothed shoe 13 and the side without the toothed shoe 13.

[0058] It should be noted that the positions of the toothed shoes 13 on the multiple stator teeth 11 can be flexibly set according to the actual situation, as long as the requirement of forming an asymmetrical toothed shoe 13 structure is met. For example, in some specific embodiments, such as Figure 1 and Figure 2 As shown, a plurality of stator teeth 11 are provided with toothed shoes 13 on the first inner surface 103 on the same side of the circumference, so that the toothed shoes 13 on the plurality of stator teeth 11 are positioned in the same position, and the toothed shoes 13 on each stator tooth 11 are formed in an asymmetrical structure. The toothed shoes 13 of any stator tooth 11 form a slot 102 of the stator tooth groove 101 with the adjacent stator tooth 11. The slot 102 is also asymmetrically opened relative to the center line of the stator tooth groove 101.

[0059] For example, in other specific embodiments, such as Figure 3 and Figure 4As shown, the plurality of stator teeth 11 include first stator teeth 111 and second stator teeth 112 arranged alternately in the circumferential direction. That is, a portion of the stator teeth 11 are first stator teeth 111, and another portion of the stator teeth 11 are second stator teeth 112. The plurality of first stator teeth 111 and the plurality of second stator teeth 112 are arranged alternately in the circumferential direction of the stator yoke 12. A stator tooth groove 101 is formed between adjacent first stator teeth 111 and second stator teeth 112. The two first inner surfaces 103 on both sides of the first stator teeth 111 in the circumferential direction are respectively provided with tooth shoes 13, while the second stator teeth 112 are not provided with tooth shoes 13. Each tooth shoe 13 forms a groove 102 corresponding to the stator tooth groove 101 between itself and the adjacent second stator teeth 112. Thus, the tooth shoe 13 provided at the slot 102 of each stator tooth groove 101 forms an asymmetrical structure, and the slot 102 is also asymmetrically opened relative to the center line of the stator tooth groove 101.

[0060] Among them, such as Figure 1 and Figure 2 The multiple stator teeth 11 and tooth shoes 13 shown have the same shape, which is more conducive to improving the performance of the motor stator 100.

[0061] In other embodiments, the ends of the two first inner side surfaces 103 of the stator tooth slot 101 (such as the inner end corresponding to the inner rotor motor or the outer end corresponding to the outer rotor motor) are provided with toothed shoes 13, and the two toothed shoes 13 have unequal extension dimensions along the circumference of the stator core 10, and the opposing sides of the two toothed shoes 13 are formed as second inner side surfaces 104. This constitutes an asymmetrical toothed shoe 13 structure.

[0062] Reference Figures 1-9 As shown, the stator winding 20 includes a plurality of coils 21 mounted on the stator core 10. Each coil 21 includes a multilayer conductor group 211, the portion of the multilayer conductor group 211 located within the stator slot 101 forming an axial conductor 212. Furthermore, the slot pitch of each coil 21 is greater than one, i.e., an integer greater than or equal to two. In other words, each coil 21 includes two axial conductors 212, and there is at least one stator slot 101 between the two stator slots 101 containing the two axial conductors 212 of the same coil 21.

[0063] Each coil 21 includes two axial conductors 212, which are located in different stator slots 101. The difference in the numbering of the stator slots 101 where the two axial conductors 212 are located is the slot span of the coil 21. For example, the stator core 10 has a total of S stator slots 101, which are numbered sequentially along the circumference of the stator core 10 in the order of No. 1, No. 2, No. 3, ..., No. S-1, No. S. If one of the axial conductors 212 of a coil 21 is located in stator slot 101 and the other axial conductor 212 is located in stator slot 6, then the slot span of the coil 21 is 5. If one of the axial conductors 212 of a coil 21 is located in stator slot 101 S and the other axial conductor 212 is located in stator slot 7, then the slot span of the coil 21 is 7.

[0064] In this configuration, within the axial conductors 212 located in the same stator slot 101, multiple conductor groups 211 are arranged circumferentially and stacked along the stator core 10, and each conductor group 211 includes multiple conductors 2111 arranged radially along the stator core 10. In some embodiments, the conductors 2111 can be flat wires. For example, in some specific embodiments, such as... Figure 2 and Figure 4 As shown, each stator slot 101 has two layers of conductor groups 211, which are stacked circumferentially along the stator core 10. Each conductor group 211 includes four conductors 2111, which are arranged radially along the stator core 10. Of course, the number of conductor groups 211 includes, but is not limited to, two layers, and the number of conductors 2111 in each conductor group 211 also includes, but is not limited to, four. A smaller number of conductor groups 211 and a smaller number of conductors 2111 in each conductor group 211 facilitate installation.

[0065] The thickness of each conductor group 211 along the circumference of the stator core 10 is L3, and L1 > L3. Taking two conductor groups 211, each containing four conductors 2111, as an example, when installing the coil 21 on the stator core 10, one conductor group 211 can be first inserted into the stator slot 101 through the slot 102. Then, the column can be moved along the circumference of the stator core 10 to the side with a spacing of L1, that is, outside the tooth shoe 13 with a circumferential dimension of L1 along the stator core 10 (i.e., moved to the side of the tooth shoe 13 away from the axis of the stator core 10). This not only limits the inserted conductor group 211 through the tooth shoe 13, but also allows the inserted conductor group 211 to avoid the slot 102, so that another conductor group 211 can be inserted into the stator slot 101 through the slot 102.

[0066] Based on the above description, the assembly method of other numbers of conductor groups 211 and conductors 2111 will be understood by those skilled in the art.

[0067] Therefore, the asymmetrical slot 102 structure effectively reduces the size of the stator slot 101, which is beneficial for increasing torque, reducing air gap, and minimizing harmonics, thereby improving NVH performance, reducing noise, and reducing iron loss of the stator core 10. Furthermore, while minimizing the size of the slot 102, the asymmetrical slot 102 structure ensures that multiple conductor groups 211 can be smoothly installed into the stator slot 101. Compared to the complex process of hairpin windings, this significantly reduces the assembly difficulty, meets the assembly requirements of various conductor layers 2111, and satisfies the motor requirements of different operating conditions or application environments. This improves the manufacturing efficiency of the motor stator 100 and increases the production qualification rate.

[0068] For example, in some embodiments, the coil 21 can be a prefabricated coil 21, which is then installed into the stator core 10 after prefabrication. The winding process of the coil 21 is not limited by the small space of the stator core 10. The position arrangement and bending direction of multiple conductors 2111 during the winding process are easy to control, which is beneficial to improving winding efficiency and pass rate, as well as meeting the needs of different motor stators 100 to change the number of conductor groups 211 and the number of conductors 2111.

[0069] It should be noted that, in the embodiments of the present invention, the number of conductors 2111 included in the multilayer conductor group 211 located in the same stator slot 101 may be equal or unequal to meet the arrangement requirements of different numbers of conductors 2111. For example, one layer of conductor group 211 may include three conductors 2111, and another layer of conductor group 211 may include four conductors 2111, so that 7 conductors 2111 are arranged in the stator slot 101; as another example, both layers of conductor group 211 include four conductors 2111, so that 8 conductors 2111 are arranged in the stator slot 101.

[0070] The beneficial effects of the motor stator 100 according to an embodiment of the present invention will be described below with reference to comparative examples.

[0071] The comparative example is identical to the rotor structure and stator core stacking thickness of the embodiment of the present invention. In the comparative example, the inner surface of the stator slot does not have tooth shoes, that is, the slot width is equal to the slot opening width; in the embodiment, the stator tooth 11 adopts an asymmetrical slot 102 structure. As shown in Table 1, compared with the comparative example, the motor stator 100 of the embodiment of the present invention increases the output torque by 0.6% under heavy load and reduces torque fluctuation by 8% under heavy load, and increases the output torque by 7.4% under light load and reduces torque fluctuation by 36.4% under light load. Under both heavy and light load conditions, torque performance and NVH performance are improved, especially under light load conditions where the improvement is significant.

[0072] Table 1

[0073] Comparative Example Example Remark Rotor structure Consistent Consistent / Stator core stack thickness (mm) Consistent Consistent / Torque (Nm) (400A) 310 312 Heavy load increases output torque by 0.6%. Torque ripple (%) (400A) 5.0 4.6 Reduces torque ripple by 8% under heavy loads. Torque (Nm) (40A) 27 29 Light load increases output torque by 7.4%. Torque ripple (%) (40A) 11 7 Light load reduces torque ripple by 36.4%.

[0074] According to an embodiment of the present invention, the motor stator 100 adopts an asymmetrical slot 102 structure at the end of the stator tooth 11, which improves torque, reduces NVH noise and iron loss, and at the same time satisfies the orderly installation of coils 21 including multiple conductor groups 211, each conductor group 211 including multiple conductors 2111 in the stator tooth slot 101, avoids mutual interference between multiple conductors 2111, reduces the difficulty of assembly process, and improves production efficiency and pass rate.

[0075] In some embodiments of the present invention, such as Figure 2 and Figure 4 As shown, in the circumferential direction of the stator core 10, the slot width of the stator slot 101 is W, and the slot opening 102 width of the stator slot 101 is L, where W and L satisfy: 0.5W ≤ L ≤ 0.9W. If L / W is too small, it will be difficult to install the conductor group 211 into the stator slot 101 when there are many layers, resulting in high installation difficulty; if L / W is too large, the slot opening 102 will be too large, which is not conducive to improving torque and reducing noise and iron loss. Within the above ratio range, the requirements for low installation difficulty and improved torque are balanced. For example, in some specific embodiments, L / W can be 0.5, 0.6, 0.7, 0.8, and 0.9, etc.

[0076] In some embodiments of the present invention, reference continues to be made to... Figure 2 and Figure 4 As shown, the width of the slot 102 of the stator slot 101 is greater than the thickness of the conductor 2111. Here, "slot width 102" refers to the dimension of the slot 102 in the circumferential direction of the stator core 10; "thickness of conductor 2111" refers to the minimum dimension of conductor 2111 in the direction perpendicular to the axis of the stator core 10, for example... Figure 2 and Figure 4 As shown, the cross-section of conductor 2111 perpendicular to the axis of stator core 10 is roughly rectangular, and the width of the rectangle is the thickness of conductor 2111.

[0077] By making the width of the slot 102 of the stator tooth groove 101 greater than the thickness of the conductor 2111, the size of the slot 102 is reduced while the conductor 2111 can be smoothly installed into the stator tooth groove 101.

[0078] In some embodiments, the width of the slot 102 is greater than the thickness of the conductor 2111, and the width of the slot 102 is less than the sum of the thicknesses of the two conductors 2111. For example, the difference between the width of the slot 102 and the thickness of the conductor 2111 is less than or equal to 2 mm, so as to meet assembly requirements while minimizing the opening size of the slot 102, thereby improving torque and reducing noise and iron loss.

[0079] According to some embodiments of the present invention, such as Figure 2 and Figure 4 As shown, within the stator slot 101, the radial dimension of the conductor 2111 along the stator core 10 is larger than its circumferential dimension along the stator core 10. For example, in some specific embodiments, the cross-section of the conductor 2111 perpendicular to the axis of the stator core 10 is rectangular, with the long side of the rectangle forming the width direction of the conductor 2111 and the short side forming the thickness direction of the conductor 2111. In each conductor group 211, multiple conductors 2111 can be arranged along the width direction of the conductor 2111, and multiple conductor groups 211 are arranged along the thickness direction of the conductor 2111. The coil 21 is formed as a flat wire coil 21.

[0080] Therefore, when each conductor group 211 is installed in the stator slot 101, the dimension of the conductor group 211 along the width direction of the slot opening 102 is the same as the dimension of the conductor 2111 along the circumference of the stator core 10. If the thickness of the conductor 2111 is small, the required size of the slot opening 102 of the stator slot 101 is smaller, and the space occupied by each conductor group 211 in the circumference of the stator core 10 is smaller, so that multiple conductor groups 211 can be set in the stator slot 101.

[0081] For example, in some embodiments, multiple conductors 2111 located in the same stator slot 101 are connected in series, that is, multiple conductors 2111 located in the same layer are connected in series, and the multilayer conductor groups 211 are also connected in series, so that the conductors 2111 located in the same stator slot 101 form a series branch. In this way, the multilayer conductor groups 211 in each stator slot 101 can form a winding effect of multiple bundles of wires, which is beneficial to improving the series flux potential of the stator winding 20 and thus improving the torque.

[0082] It should be noted that multiple conductors 2111 within the same stator slot 101 can be wound using the same wire, which simplifies the production process and improves production efficiency. Alternatively, multiple conductors 2111 can be wound using different wires, and the wound conductors 2111 can be welded together to form a series structure. For example, multiple conductors 2111 located on the same layer can be wound using the same wire. After each layer of conductor group 211 is installed into the stator slot 101, the multiple conductor groups 211 are welded together to form a series structure. This not only meets the performance requirements such as improving torque, but also further reduces the installation difficulty of the stator winding 20 on the stator core 10 and improves assembly efficiency.

[0083] In some embodiments of the present invention, such as Figures 5-15As shown, each coil 21 may include two axial conductors 212 and two end conductors 213. The multilayer conductor group 211 included in the coil 21 has portions within the stator slots 101 forming axial conductors 212, and portions outside the stator slots 101 forming end conductors 213, i.e., portions located at both axial ends of the stator core 10 forming end conductors 213. The two axial conductors 212 are respectively located within two stator slots 101, one end conductor 213 connects one end of the two axial conductors 212, and the other end conductor 213 connects the other end of the two axial conductors 212, thus forming a ring structure for the coil 21.

[0084] According to some embodiments of the present invention, such as Figures 5-9 As shown, among the multiple coils 21 of the stator winding 20, at least two coils 21 can be arranged concentrically. Among the two concentrically arranged and adjacent coils 21, the difference between the slot span of the outer coil 21 and the slot span of the inner coil 21 is 2, which ensures that the installation of multiple coils 21 on the stator core 10 does not interfere with each other and avoids damage to the coils 21.

[0085] According to some embodiments of the present invention, such as Figures 5-9 As shown, the multiple coils 21 of the stator winding 20 can form a first coil 22 and a second coil 23 with different structures. It should be noted that each first coil 22 may include one or more coils 21, and each second coil 23 may include one or more coils 21. In embodiments that include multiple coils 21, the multiple coils 21 can be arranged concentrically to form a first coil 22 or a second coil 23.

[0086] Furthermore, there are multiple first coils 22 arranged circumferentially along the stator core 10, and multiple second coils 23 arranged circumferentially along the stator core 10. The multiple first coils 22 and multiple second coils 23 are staggered by a preset angle, which is half of the central angle corresponding to the first coil 22, so that the axial conductor 212 of each second coil 23 is located in the stator slot 101 between the two axial conductors 212 of the same first coil 22, and the axial conductor 212 of each first coil 22 is located in the stator slot 101 between the two axial conductors 212 of the same second coil 23.

[0087] In some specific embodiments, the first coil 22 includes two concentrically arranged coils 21, and the second coil 23 also includes two concentrically arranged coils 21. Both the first coil 22 and the second coil 23 include two outer axial conductors 212 and two inner axial conductors 212. An adjacent pair of inner axial conductors 212 and outer axial conductors 212 of the first coil 22 are located between the two inner axial conductors 212 of the second coil 23, and an adjacent pair of inner axial conductors 212 and outer axial conductors 212 of the second coil 23 are located between the two inner axial conductors 212 of the first coil 22. For example, the stator slots 101 corresponding to the four axial conductors 212 of the first coil 22 can be numbered 1, 2, 7, and 8, and the stator slots 101 corresponding to the four axial conductors 212 of the second coil 23 can be numbered 5, 6, 11, and 12.

[0088] In some embodiments, such as Figures 8-12 As shown, the end conductor 213 of the first coil 22 may include a first extension 221 and a first connecting section 222, wherein the first extension 221 extends circumferentially along the stator core 10, and the first connecting section 222 connects the first extension 221 and the corresponding axial conductor 212, so that the first coil 22 forms a ring structure. Figures 5-7 and Figures 13-15 As shown, the end conductor 213 of the second coil 23 may include a second extension 231 and a second connecting section 232, wherein the second extension 231 extends circumferentially along the stator core 10, and the second connecting section 232 connects the second extension 231 and the corresponding axial conductor 212, so that the second coil 23 forms a ring structure.

[0089] And, as Figures 5-7 As shown, the first extension 221 is located axially outside the stator yoke 12, and the second extension 231 is located axially outside the stator tooth 11. In other words, the projection of the first extension 221 along the axial direction of the stator core 10 falls within the projection range of the stator yoke 12, and the projection of the second extension 231 along the axial direction of the stator core 10 is located in the region between the stator yoke 12 and the stator hole. Thus, the first extension 221 of the first coil 22 and the second extension 231 of the second coil 23 are arranged radially offset from each other along the stator core 10, satisfying the arrangement requirements of the first coil 22 and the second coil 23 arranged circumferentially offset, avoiding interference, and facilitating installation.

[0090] In some embodiments, continue to refer to Figures 5-7As shown, in the axial direction of the stator core 10, the second extension 231 is located on the side of the first extension 221 away from the stator core 10, so that the first extension 221 and the second extension 231 are staggered in the axial direction of the stator core 10, which satisfies the arrangement requirements of the first coil 22 and the second coil 23 arranged circumferentially staggered, and avoids interference.

[0091] During the assembly process, multiple first coils 22 can be installed into the corresponding stator slots 101, so that the two first extensions 221 of each first coil 22 are located on the axial sides of the stator yoke 12, and the first extensions 221 are in contact or clearance fit with the stator yoke 12; then multiple second coils 23 can be installed into the corresponding stator slots 101, so that the two second extensions 231 of each second coil 23 are located on the axial sides of the stator tooth 11, and the second extensions 231 are located outside the first connecting section 222 of the first coil 22 (i.e., the side away from the stator core 10). The assembly of the first coils 22 does not affect the assembly of the second coils 23. The structure and arrangement are reasonable and orderly.

[0092] According to some embodiments of the present invention, such as Figures 10-12 As shown, in the first extension 221, multiple conductor groups 211 are arranged radially along the stator core 10, and the multiple conductors 2111 included in each conductor group 211 are arranged axially along the stator core 10. Correspondingly, the first connecting section 222 can extend substantially radially along the stator core 10. When winding the coil 21, the conductor 2111 of the axial conductor 212 can be bent outward radially along the stator core 10, then bent circumferentially along the stator core 10, and then bent inward radially along the stator core 10 to wind one of the conductors 2111 in the end conductors 213. Throughout the winding process, a single conductor group 211 consisting of an axial conductor 212 and an end conductor 213 can be obtained by bending and winding a single wire. Alternatively, multiple conductor groups 211 can be formed by bending and winding the same single wire. This eliminates the need for twisting and widening processes in hairpin windings, significantly reducing the complexity of the process and improving manufacturing efficiency. Furthermore, the multiple conductors 2111 of the multi-layer conductor group 211 are neat and orderly, which can significantly improve the pass rate and the performance of the motor stator 100.

[0093] According to some embodiments of the present invention, such as Figures 13-15As shown, in the second extension 231, the multilayer conductor group 211 is arranged along the axial direction of the stator core 10, and the multiple conductors 2111 included in each conductor group 211 are arranged radially along the stator core 10. Correspondingly, the second connecting section 232 can extend substantially along the axial direction of the stator core 10. When winding the coil 21, the conductor 2111 of the axial conductor 212 can be extended outward along the axial direction of the stator core 10, then bent circumferentially along the stator core 10, and then extended inward along the axial direction of the stator core 10 to wind one of the conductors 2111 in the end conductor 213. Throughout the winding process, a single conductor group 211 consisting of an axial conductor 212 and an end conductor 213 can be obtained by bending and winding a single wire. Alternatively, multiple conductor groups 211 can be formed by bending and winding the same single wire, eliminating the need for twisting and widening processes in hairpin windings. This significantly reduces the complexity of the process and improves manufacturing efficiency. Furthermore, the multiple conductors 2111 of the multi-layer conductor group 211 are neat and orderly, which can significantly improve the pass rate and the performance of the motor stator 100.

[0094] In some embodiments of the present invention, such as Figures 5-9 As shown, the stator winding 20 includes a multi-phase winding. Each phase winding has multiple coils 21 corresponding to multiple first coils 22 and multiple second coils 23. "Multiple" refers to two or more coils. All first coils 22 are arranged sequentially along the circumference of the stator core 10 according to a predetermined multi-phase order. All second windings are also arranged sequentially along the circumference of the stator core 10 according to a predetermined multi-phase order. Furthermore, the first coils 22 and second coils 23 corresponding to the same phase are arranged alternately along the circumference of the stator core 10. Each first coil 22 may include at least one coil 21, and each second coil 23 may include at least one coil 21.

[0095] For example, such as Figures 5-9 As shown, the stator winding 20 includes six first coils 22 and six second coils 23, and the stator winding 20 includes three-phase windings of phase A, phase B, and phase C, with each phase including two first coils 22 and two second coils 23. The six first coils 22 are arranged sequentially in the order of phase A, phase B, phase C, phase A, phase B, and phase C, and the six second coils 23 are arranged sequentially in the order of phase A, phase B, phase C, phase A, phase B, and phase C. Each first coil 22 includes two concentrically arranged coils 21, and each second coil 23 also includes two concentrically arranged coils 21. The first coils 22 and second coils 23 corresponding to the same phase are arranged alternately, i.e., in the order of first coil 22, second coil 23, first coil 22, second coil 23; the first coils 22 and second coils 23 corresponding to the same phase are arranged alternately, i.e., in the order of first coil 22, second coil 23, first coil 22, second coil 23.

[0096] By setting two different structures for the first coil 22 and the second coil 23, the assembly requirements of the stator winding 20 can be met. The first coil 22 and the second coil 23 have strong applicability, and the number of types of coil 21 is small, which helps to reduce the difficulty of prefabricating the coil 21 and improve production efficiency.

[0097] In some specific embodiments, such as Figures 5-7 As shown, both the first coil 22 and the second coil 23 include two coils 21 arranged concentrically, that is, both include an inner coil 21 and an outer coil 21. Each phase winding includes multiple branches connected in parallel, and each branch connects only the two coils 21 of the first coil 22 in series, only the two coils 21 of the second coil 23 in series, or simultaneously connects the two coils 21 of the first coil 22 and the two coils 21 of the second coil 23 in series. Thus, each branch forms a non-full-turn arrangement structure, which is conducive to forming more parallel branches to meet the application requirements of low-voltage conditions. Furthermore, by connecting two coils 21 located in the same first coil 22 or the same second coil 23 in series, the resistance difference between the two coils 21 can be balanced to improve the performance of the motor stator 100.

[0098] Specifically, each phase winding includes two first coils 22 (denoted as 1# first coil 22 and 2# first coil 22) and two second coils 23 (denoted as 1# second coil 23 and 2# second coil 23), which are arranged along the circumference of the stator core 10 in the order of 1# first coil 22, 1# second coil 23, 2# first coil 22, and 2# second coil 23.

[0099] like Figure 16 As shown, each phase winding forms two parallel branches. One branch connects the inner and outer coils 21 of the first coil 22 and the inner and outer coils 21 of the second coil 23 in series. The other branch connects the inner and outer coils 21 of the first coil 22 and the inner and outer coils 21 of the second coil 23 in series.

[0100] like Figure 17 As shown, each phase winding forms four parallel branches. The first branch connects the inner coil 21 and outer coil 21 of the first coil 22 in series. The second branch connects the inner coil 21 and outer coil 21 of the second coil 23 in series. The third branch connects the inner coil 21 and outer coil 21 of the first coil 22 in series. The fourth branch connects the inner coil 21 and outer coil 21 of the second coil 23 in series.

[0101] According to some embodiments of the present invention, the number of stator slots 101 of the stator core 10 is S, the number of pole pairs of the motor assembly 200 is p, and the number of concentrically arranged coils 21 included in the first coil 22 (or the second coil 23) is k, where S = 6kp, k = 1, 2, 3..., and the number of conductor groups 211 in each coil 21 is n, where n > 1. The larger k is, the more difficult it is to install the prefabricated coils 21 into the stator core 10; the larger n is, the more difficult it is to install the prefabricated coils 21 into the stator core 10. Therefore, in some embodiments, k = 2 and n = 2. p can be determined according to the application of the motor stator 100 to meet different application requirements. For example, when the motor stator 100 is used in the operation of an automobile drive motor, p can be 4, 6, 8, etc., which can reduce the frequency at a certain speed, thereby reducing the control difficulty of the electronic controller and reducing the loss of the stator core 10.

[0102] In some specific embodiments, the number of slots in the stator 101 is 48, and the number of pole pairs corresponding to the motor stator 100 is 6, making the motor stator 100 more in line with the application requirements of automotive drive motors.

[0103] The motor stator 100 according to a specific embodiment of the present invention is described in detail below with reference to the accompanying drawings. It is to be understood that the following description is merely illustrative and should not be construed as limiting the invention.

[0104] According to some embodiments of the present invention, such as Figures 1-17 As shown, the motor stator 100 includes a stator core 10 and a stator winding 20. The motor stator 100 has 4 pole pairs. The stator core 10 includes a stator yoke 12 and 48 stator teeth 11. The 48 stator teeth 11 are located on the inner circumferential surface of the stator yoke 12 to define 48 stator slots 101. Each stator tooth 11 has two identical but asymmetrical tooth shoes 13 at its inner end. The two tooth shoes 13 define a slot 102 for the stator slot 101. The width of the slot 102 is 0.5 times the width of the stator slot 101, and the width of the slot 102 is greater than the thickness of the flat wire. The circumferential length L1 of one tooth shoe 13 is greater than the circumferential length L2 of the other tooth shoe 13.

[0105] The stator winding 20 includes a three-phase pre-formed flat wire winding mounted on the stator core 10. Each phase winding consists of two types of pre-formed flat wire coils 21, namely a first coil 22 and a second coil 23. The first coil 22 and the second coil 23 corresponding to the same phase are arranged alternately in the circumferential direction.

[0106] The first coil 22 and the second coil 23 each include two coils 21 arranged concentrically, namely an inner coil 21 and an outer coil 21. The slot span of the outer coil 21 is 2 larger than that of the inner coil 21. Each coil 21 includes two layers of conductor groups 211 arranged along the thickness direction of the conductor 2111. Each layer of conductor group 211 includes four turns of conductor 2111 arranged along the width direction of the flat wire.

[0107] In the process of prefabricating the coil 21, four turns of conductor 2111 of the inner conductor group 211 can be wound sequentially from back to front along the width direction of the flat wire. Then, four turns of conductor 2111 of the outer conductor group 211 can be wound sequentially from front to back along the width direction of the flat wire, thereby obtaining the prefabricated coil 21.

[0108] The prefabricated coil 21 includes an axial conductor 212 extending along the axial direction of the stator core 10 and an end conductor 213 located outside the stator tooth slot 101. During assembly, the axial conductor 212 of each coil 21 is inserted into the corresponding stator tooth slot 101. The first extension 221 of the end conductor 213 of the first coil 22 is located on the axial side of the stator yoke 12, and the second extension 231 of the end conductor 213 of the second coil 23 is located on the axial side of the stator tooth slot 11.

[0109] During the installation of the axial conductor 212, four conductors 2111 of one layer of conductor group 211 can be moved through the slot 102 into the stator tooth slot 101. Then, the four conductors 2111 are moved circumferentially to the side of the tooth shoe 13 near the bottom of the slot to avoid the slot 102. Then, four conductors 2111 of another layer of conductor group 211 are moved through the slot 102 into the stator tooth slot 101, thereby completing the installation of the coil 21. During the installation process, the eight conductors 2111 located in the same stator tooth slot 101 do not interfere with each other and can maintain the orderly arrangement after prefabrication.

[0110] In addition, the 48 stator slots 101 of the stator core 10 are numbered sequentially as No. 1, No. 2, No. 3... No. 47, No. 48. The stator winding 20 includes three-phase windings: phase A, phase B, and phase C.

[0111] In one of the first coils 22 of phase A, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 1 and 8, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 2 and 7; in the other first coil 22 of phase A, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 25 and 32, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 26 and 31; A In one of the second coils 23 of phase A, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 13 and 20, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 14 and 19; in the other second coil 23 of phase A, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 37 and 44, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 38 and 43.

[0112] In one of the first coils 22 of phase B, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 9 and 16 101, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 10 and 15 101; in the other first coil 22 of phase B, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 33 and 40 101, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 34 and 39 101; In one of the second coils 23 of phase B, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 21 and 28, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 22 and 27; in the other second coil 23 of phase B, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 45 and 4, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 46 and 3.

[0113] In one of the first coils 22 of phase C, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 17 and 24, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 18 and 23; in the other first coil 22 of phase C, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 41 and 48, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 42 and 47. In one of the second coils 23 of phase C, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 5 and 12 101, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 6 and 11 101; in the other second coil 23 of phase C, the two axial conductors 212 of the outer coil 21 are respectively located in stator slots 29 and 36 101, and the two axial conductors 212 of the inner coil 21 are respectively located in stator slots 30 and 35 101.

[0114] After installation, the two coils 21 of one first coil 22 and the two coils 21 of one second coil 23 in phase A can be connected in series by welding to form a branch. Similarly, the two coils 21 of the other first coil 22 and the two coils 21 of the other second coil 23 in phase A can be connected in series by welding to form a branch, so that phase A has two parallel branches. Similarly, phases B and C each have two parallel branches, and the motor stator 100 is completed.

[0115] Throughout the production process, the twisting and flaring processes of the hairpin winding are eliminated, greatly reducing the complexity of the process. Furthermore, the asymmetrical toothed shoe 13 structure can meet the orderly assembly of the prefabricated coil 21, including the multi-layer conductor group 211, improving the manufacturing efficiency of the motor stator 100 and increasing the pass rate.

[0116] like Figure 18 As shown, the motor assembly 200 according to an embodiment of the present invention includes a motor stator 100 according to an embodiment of the present invention. Since the motor stator 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the motor assembly 200 according to an embodiment of the present invention, by adopting an asymmetrical slot 102 structure at the ends of the stator teeth 11, improves torque, reduces NVH noise and iron loss, and simultaneously satisfies the orderly installation of coils 21 including multiple conductor groups 211, each conductor group 211 including multiple conductors 2111, within the stator slots 101, avoiding interference between multiple conductors 2111, reducing assembly process difficulty, and improving production efficiency and yield.

[0117] like Figure 18As shown, the vehicle 300 according to an embodiment of the present invention includes a motor assembly 200 according to an embodiment of the present invention. Since the motor assembly 200 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the vehicle 300 according to an embodiment of the present invention, by adopting an asymmetrical slot 102 structure at the end of the stator tooth portion 11, improves torque, reduces NVH noise and iron loss, and simultaneously satisfies the orderly installation of coils 21 including multiple conductor groups 211, each conductor group 211 including multiple conductors 2111, within the stator tooth slots 101, avoiding interference between multiple conductors 2111, reducing assembly process difficulty, and improving production efficiency and yield.

[0118] Here, vehicle 300 can be a new energy vehicle 300. In some embodiments, the new energy vehicle 300 can be a pure electric vehicle 300 with the motor assembly 200 as the main driving force. In other embodiments, the new energy vehicle 300 can also be a hybrid vehicle 300 with both an internal combustion engine and the motor assembly 200 as the main driving force. Regarding the internal combustion engine and motor assembly 200 that provide driving power for the new energy vehicle 300 mentioned in the above embodiments, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to the motor assembly 200 can be a power battery, hydrogen fuel cell, etc., without special limitation. It should be noted that this is merely an exemplary description of the structure of the new energy vehicle 300, etc., and is not intended to limit the scope of protection of the present invention.

[0119] Furthermore, in some embodiments, the compressor applicable to the new energy vehicle 300 according to the present invention can be an electric compressor including a drive unit and a compression unit, wherein the drive unit in the electric compressor drives the compression unit to perform compression work. For example, the drive unit can be a motor assembly 200 including a motor rotor and a motor stator 100.

[0120] Other configurations and operations of the vehicle 300 and motor assembly 200 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0121] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0122] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" 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 the present invention. 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.

[0123] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor stator, characterized in that, include: A stator core includes multiple stator teeth and an annular stator yoke. The multiple stator teeth are disposed on the inner or outer circumferential surface of the stator yoke along its circumference. A stator tooth groove is formed between two adjacent stator teeth. Each stator tooth groove has two opposing first inner surfaces. The groove opening of the stator tooth groove has two opposing second inner surfaces. The distances between the two second inner surfaces and the adjacent first inner surfaces are L1 and L2, respectively, where L1 > L2. One of the two first inner surfaces of the stator tooth groove has a toothed shoe at its end. The end face of the toothed shoe along its circumferential direction forms the second inner surface. The other first inner surface is coplanar with the corresponding second inner surface. Alternatively, both ends of the two first inner surfaces of the stator tooth groove have toothed shoes. The opposing sides of the two toothed shoes form the second inner surfaces. The extension dimensions of the two toothed shoes along the circumferential direction of the stator core are not equal. A stator winding includes multiple coils mounted on a stator core. Each coil comprises multiple layers of conductor groups, the portions of which are formed as axial conductors within stator slots. Each coil includes two axial conductors, and at least one stator slot is located between the two stator slots containing the axial conductors of the same coil. In the axial conductor, multiple conductor groups are arranged circumferentially along the stator core, and each conductor group includes multiple conductors arranged radially along the stator core. The thickness of each conductor group along the circumferential direction of the stator core is L3, and L1 > L3. The number of conductors included in the multiple conductor groups may be equal or unequal. In the circumferential direction of the stator core, the slot width of the stator tooth is W, and the slot opening width of the stator tooth is L, where 0.5W≤L≤0.9W.

2. The motor stator according to claim 1, characterized in that, The stator teeth are provided with tooth shoes on the same side along the circumferential direction, or... The plurality of stator teeth include a first stator tooth and a second stator tooth arranged alternately along the circumference, and the first stator tooth has toothed shoes on two sides along the circumference.

3. The motor stator according to claim 1, characterized in that, The width of the stator slot is greater than the thickness of the conductor.

4. The motor stator according to claim 1, characterized in that, Within the stator slot, the conductor's radial dimension along the stator core is greater than its circumferential dimension along the stator core.

5. The motor stator according to claim 1, characterized in that, The coil is a prefabricated coil.

6. The motor stator according to any one of claims 1-5, characterized in that, Each coil includes two axial conductors and two end conductors, with the portions of the multilayer conductor group located at both axial ends of the stator core forming the end conductors, which are used to connect the ends of the two axial conductors.

7. The motor stator according to claim 6, characterized in that, The plurality of said coils constitute a first coil and a second coil. The end conductor of the first coil includes a first extension and a first connecting section. The first extension extends circumferentially along the stator core, and the first connecting section connects the first extension and the corresponding axial conductor. The end conductor of the second coil includes a second extension and a second connecting section. The second extension extends circumferentially along the stator core, and the second connecting section connects the second extension and the corresponding axial conductor. The first extension is located on the axial outer side of the stator yoke, and the second extension is located on the axial outer side of the stator teeth.

8. The motor stator according to claim 7, characterized in that, In the axial direction of the stator core, the second extension is located on the side of the first extension away from the stator core.

9. The motor stator according to claim 7, characterized in that, In the first extension section, the multiple conductor groups are arranged radially along the stator core, and the multiple conductors of each conductor group are arranged axially along the stator core. In the second extension, the multiple conductor groups are arranged along the axial direction of the stator core, and the multiple conductors of each conductor group are arranged along the radial direction of the stator core.

10. The motor stator according to claim 1, characterized in that, The stator winding includes a multi-phase winding, and the multiple coils corresponding to each phase winding constitute multiple first coils and multiple second coils. The first coils and second coils corresponding to the same phase are arranged alternately along the circumference of the stator core. Both the first coil and the second coil include two coils arranged concentrically. Each phase winding includes multiple branches connected in parallel, and each branch is connected in series with two coils of the first coil and / or in series with two coils of the second coil.

11. The motor stator according to any one of claims 1-5, characterized in that, The conductors located in the same stator slot are connected in series.

12. The motor stator according to any one of claims 1-5, characterized in that, The stator has 48 slots and the motor stator has 6 pole pairs.

13. A motor assembly, characterized in that, Includes the motor stator according to any one of claims 1-12.

14. A vehicle, characterized in that, Includes the motor assembly as described in claim 13.

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