Stator assembly, electric machine and vehicle

Abstract

The application provides a stator assembly, a motor and a vehicle. The stator assembly comprises a stator core and a winding. The inner wall of the stator core is circumferentially provided with 72 coil slots. The direction from the slot opening to the slot bottom is the radial direction of the stator core. The coil slots are provided with a plurality of coil layers. The winding comprises three parallel branches. In the same branch, the starting end of a coil is electrically connected to the ending end of an adjacent coil and is stacked on two adjacent coil layers. The first coil and the third coil are respectively distributed on the first coil layer and the bottom coil layer and are both same-layer spanning. The second coil is located between the first coil layer and the bottom coil layer and spans two adjacent coil layers. The starting end of the starting coil of the three branches is located on the same layer of the coil layer and is located in adjacent coil slots. The ending end of the ending coil of the three branches is located on the same layer of the coil layer and is located in adjacent coil slots, so that the connection difficulty of the three branches and other structures can be reduced.

Description

Technical Field

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

[0002] Stator assemblies typically employ two winding distribution schemes: wave winding and lap winding. Compared to wave winding, lap winding allows for a wider range of winding distribution options.

[0003] In the lap winding distribution scheme, the spacing between the lead-out ends of the coils in multiple branches is relatively large, which increases the connection cost. Summary of the Invention

[0004] The purpose of this application is to provide a stator assembly, motor, or vehicle to improve at least one of the aforementioned technical problems.

[0005] This application achieves the above objectives through the following technical solutions.

[0006] In a first aspect, embodiments of this application provide a stator assembly, which includes a stator core and windings. The inner wall of the stator core has 72 coil slots distributed circumferentially. The direction from the slot opening to the bottom of the slot is the radial direction of the stator core. Multiple coil layers are arranged in the coil slots from the slot opening to the bottom. The windings include three parallel branches, each branch consisting of multiple coils connected sequentially. Each coil has a start end and a stop end, and the start end and stop end of the same coil are located in different coil slots. In the same branch, the start end of one coil is electrically connected to the stop end of an adjacent coil. The coils are stacked on two adjacent coil layers; the multiple coils include a first coil, a second coil, and a third coil. The first coil and the third coil are respectively distributed in the first coil layer and the bottom coil layer, and both span the same layer; the second coil is located in the coil layer between the first coil layer and the bottom coil layer, and spans two adjacent coil layers; the first and last coils of each branch are the starting coil and the ending coil, respectively. The starting ends of the starting coils of the three branches are all located in the same layer of the coil layer and in adjacent coil slots; the ending ends of the ending coils of the three branches are all located in the same layer of the coil layer and in adjacent coil slots.

[0007] In some embodiments, the coil slot has M coil layers arranged from the slot opening to the bottom of the slot; each branch is composed of multiple first sub-paths and second sub-paths connected together, the first sub-path is composed of a first coil and N second coils connected in sequence, and the second sub-path is composed of a third coil and N second coils connected in sequence; the first sub-path and the second sub-path are connected end to end and are arranged alternately; wherein, M = 2N + 2, and N is an integer greater than or equal to 1.

[0008] In some implementations, the first coil has a span of 10 or 12 coil slots; the N second coils each have a span of 12 coil slots; and the third coil has a span of 9, 10, 11, 12, or 13 coil slots.

[0009] In some embodiments, the first coil has a span of 10 or 12 coil slots; one of the N second coils has a span of 11 coil slots, and the remaining second coils have a span of 12 coil slots; the third coil has a span of 9, 10, 11, 12, or 13 coil slots.

[0010] In some implementations, the three branches include a first branch, which is connected as follows: third coil - span of 9, N second coils; first coil - span of 12, N second coils; third coil - span of 13, N second coils; first coil - span of 12, N second coils; third coil - span of 12, N second coils; first coil - span of 12, N second coils; third coil - span of 11, N second coils; first coil - span of 12, N second coils.

[0011] In some implementations, the three branches also include a second branch, which is connected as follows: third coil - span of 12, N second coils; first coil - span of 12, N second coils; third coil - span of 11, N second coils; first coil - span of 12, N second coils; third coil - span of 9, N second coils; first coil - span of 12, N second coils; third coil - span of 13, N second coils; first coil - span of 12, N second coils.

[0012] In some implementations, the three branches also include a third branch, which is connected as follows: third coil - span of 10, N second coils; first coil - span of 12, N second coils; third coil - span of 11, N second coils; first coil - span of 10, N second coils; third coil - span of 12, N second coils; first coil - span of 10, N second coils; third coil - span of 11, N second coils; first coil - span of 12, N second coils.

[0013] In some implementations, the stator assembly includes three-phase windings, each with the same structure.

[0014] In some implementations, the three branches are magnetically symmetrical.

[0015] Secondly, embodiments of this application provide an electric motor, which includes a rotor and a stator assembly as described in any of the above embodiments.

[0016] Thirdly, this application provides a vehicle, which includes a vehicle body and a motor as described in the above embodiments, the motor being mounted on the vehicle body.

[0017] In the stator assembly, motor, and vehicle provided in this application, the stator assembly includes a stator core and windings. The inner wall of the stator core has 72 coil slots distributed along the circumferential direction. The direction from the slot opening to the bottom of the slot is the radial direction of the stator core. Multiple coil layers are arranged in the coil slots from the slot opening to the bottom of the slot. The windings include three parallel branches, each branch consisting of multiple coils connected sequentially. Each coil has a start end and a stop end, and the start end and stop end of the same coil are located in different coil slots. In the same branch, the start end of one coil is electrically connected to the stop end of an adjacent coil and is stacked on two adjacent coil layers. The multiple coils include a first coil, a second coil, and a third coil. The first coil and the third coil are respectively distributed in the first coil layer and the bottom coil layer, and both span the same layer. The second coil is located in the coil layer between the first coil layer and the bottom coil layer and spans two adjacent coil layers. The start and end coils of each branch are the start coil and the stop coil, respectively. The starting ends of the starting coils of the three branches are all located on the same layer of the coil layer and in adjacent coil slots, which helps to shorten the distance between the starting ends of the starting coils of the three branches. The ending ends of the ending coils of the three branches are all located on the same layer of the coil layer and in adjacent coil slots, which helps to shorten the distance between the ending ends of the ending coils of the three branches, thereby reducing the difficulty of connecting the three branches to other structures and reducing connection costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the vehicle structure provided in the embodiments of this application is shown.

[0020] Figure 2 A schematic diagram of the structure of the stator assembly provided in an embodiment of this application is shown.

[0021] Figure 3 It shows Figure 2 A schematic diagram of the stator assembly from another perspective.

[0022] Figure 4 It shows Figure 2 A top view of the stator core structure.

[0023] Figure 5 It shows Figure 2 A partial cross-sectional view of the stator assembly.

[0024] Figure 6 It shows Figure 2 A schematic diagram of the structure of the first coil.

[0025] Figure 7 It shows Figure 2 A schematic diagram of the structure of the second coil.

[0026] Figure 8 It shows Figure 2 A schematic diagram of the structure of the third coil.

[0027] Figure 9 It shows Figure 2 A schematic diagram showing the expansion and connection of the first branch.

[0028] Figure 10 It shows Figure 2 A schematic diagram showing the expanded connection of the second branch.

[0029] Figure 11 It shows Figure 2 A schematic diagram showing the expanded connection of the third branch. Detailed Implementation

[0030] The embodiments of this application 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 this application, and should not be construed as limiting this application.

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0032] Please see Figure 1 The present application provides a vehicle 1, which can be an electric vehicle, a hybrid electric vehicle, a flying car, or other vehicles.

[0033] The vehicle 1 includes a body 10 and a motor 30. The motor 30 is mounted on the body 10 and can serve as a power source for the vehicle 1 to provide power for its movement.

[0034] In some implementations, motor 30 may be a three-phase motor.

[0035] In some implementations, motor 30 may be a flat wire motor.

[0036] In some embodiments, the motor 30 may include a motor housing, which can provide mounting positions and protection for structures within the motor 30.

[0037] Please see Figures 1 to 3 In some embodiments, the motor 30 includes a rotor and a stator assembly 31, the rotor being located within the stator assembly 31, and both the stator assembly 31 and the rotor being mounted within a motor housing. When energized, the stator assembly 31 generates electromagnetic force to drive the rotor to rotate.

[0038] Please see Figures 2 to 4 In some embodiments, the stator assembly 31 includes a stator core 310 and a winding 350. The inner wall of the stator core 310 has 72 coil slots 311 distributed along the circumferential direction. The direction from the slot opening to the bottom of the coil slot 311 is the radial direction of the stator core 310. Multiple coil layers 313 are provided in the coil slots 311 from the slot opening to the bottom of the slot.

[0039] Among them, the 72 coil slots 311 can be equidistantly and evenly distributed on the inner circumference of the stator core 310.

[0040] like Figure 5 As shown, coil layer 313 specifically refers to the number of layers of all coil slots 311 distributed from the slot opening to the slot bottom, with each coil slot 311 having the same number of layers from the slot opening to the slot bottom. For example, the slot opening of each coil slot 311 is located in the first coil layer 3131, and the slot bottom of each coil slot 311 is located in the bottom coil layer 3133.

[0041] The winding 350 includes three parallel branches 351, each branch 351 being formed by multiple coils 3510 connected sequentially. Each coil 3510 has a start end 3511 and a stop end 3513. The start end 3511 and the stop end 3513 of the same coil 3510 are located in different coil slots 311. In the same branch 351, the start end 3511 of one coil 3510 is electrically connected to the stop end 3513 of an adjacent coil 3510 and stacked on two adjacent coil layers 313. By adopting the method of connecting coils 3510 end to end, the coils 3510 are electrically connected to each other only through the start end 3511 and the stop end 3513, thereby reducing the number of connection positions and helping to reduce the failure rate.

[0042] The starting end 3511 of a coil 3510 is electrically connected to the ending end 3513 of an adjacent coil 3510, and is stacked on two adjacent coil layers 313. Specifically, in the same branch 351, the ending end 3513 of any coil 3510 is stacked on different coil layers 313 with the starting end 3511 of the adjacent coil 3510, and is electrically connected. Here, electrical connection can refer to welding.

[0043] See Figures 6 to 8 The multiple coils 3510 include a first coil 3515, a second coil 3517, and a third coil 3519. The first coil 3515 and the third coil 3519 are respectively distributed in the first coil layer 3131 and the bottom coil layer 3133, and both span the same layer. The second coil 3517 is located in the coil layer 313 between the first coil layer 3131 and the bottom coil layer 3133, and spans two adjacent coil layers 313. Thus, the first coil 3515, the second coil 3517, and the third coil 3519 can be distributed in different coil slots 311 and coil layers 313, which helps to reduce the situation where coil slots 311 or coil layers 313 are not used.

[0044] The first coil layer 3131 can be located at the opening or the bottom of the coil slot 311. The second coil layer 3133 can be located at the opening or the bottom of the coil slot 311. The first coil layer 3131 and the second coil layer 3133 are respectively distributed at the opening and the bottom of the coil slot 311.

[0045] The first coil 3515 and the third coil 3519 are respectively distributed in the first coil layer 3131 and the bottom coil layer 3133. It can mean that the first coil 3515 is located in the first coil layer 3131 and the third coil 3519 is located in the bottom coil layer 3133, or it can mean that the first coil 3515 is located in the bottom coil layer 3133 and the third coil 3519 is located in the first coil layer 3131.

[0046] "Same-layer crossing" specifically refers to the fact that the starting end 3511 and the ending end 3513 of the same coil 3510 are located in the same coil layer 313, but cross different coil slots 311.

[0047] Each branch 351 has a starting coil and a ending coil at its beginning and end, respectively. The starting end 3511 of the starting coil is used to connect with other structures; specifically, it is electrically connected to a busbar to connect the three branches 351 in parallel. The ending end 3513 of the starting coil is connected to the starting end 3511 of the adjacent coil 3510. Similarly, the ending end 3513 of the ending coil is used to connect with other structures; specifically, it is electrically connected to a busbar to connect the three branches 351 in parallel. The starting end 3511 of the ending coil is connected to the starting end 3511 of the adjacent coil 3510. It should be noted that the busbars connected to the starting end 3511 of the starting coil and the busbars connected to the ending end 3513 of the ending coil can be different busbars.

[0048] The starting ends 3511 of the starting coils of the three branches 351 are all located on the same layer of the coil layer 313 and in adjacent coil slots 311. This helps to shorten the distance between the starting ends 3511 of the starting coils of the three branches 351, thereby reducing the difficulty of connecting the three branches 351 to other structures. For example, it reduces the difficulty of connecting the three branches 351 to the busbar, reduces the connection cost, and reduces the process difficulty and manufacturing cost of the busbar.

[0049] The termination ends 3513 of the termination coils of the three branches 351 are all located on the same layer of the coil layer 313 and in adjacent coil slots 311. This helps to shorten the distance between the termination ends 3513 of the termination coils of the three branches 351, thereby reducing the difficulty of connecting the three branches 351 to other structures. For example, it reduces the difficulty of connecting the three branches 351 to the busbar, reduces the connection cost, and reduces the process difficulty and manufacturing cost of the busbar.

[0050] For ease of understanding, the starting end 3511 of the starting coil of branch 351 is named the first lead-out end 3521, and the ending end 3513 of the ending coil of branch 351 is named the second lead-out end 3523.

[0051] In some implementations, the stator assembly 31 may include three-phase windings 350, each of which may have the same structure, thereby reducing manufacturing costs.

[0052] For example, the three-phase winding 350 can be a U-phase winding, a V-phase winding, and a W-phase winding. Each of the U-phase, V-phase, and W-phase windings includes three parallel branches 351. The three branches 351 of each phase winding 350 have the same structure: the first branch 3550 of the U-phase winding, the first branch 3550 of the V-phase winding, and the first branch 3550 of the W-phase winding have the same structure; the second branch 3560 of the U-phase winding, the second branch 3560 of the V-phase winding, and the second branch 3560 of the W-phase winding have the same structure; and the third branch 3570 of the U-phase winding, the third branch 3570 of the V-phase winding, and the third branch 3570 of the W-phase winding have the same structure.

[0053] The three-phase windings 350 have the same structure, and each phase winding 350 can be distributed in different coil slots 311.

[0054] For ease of description, the following description will focus on one phase winding 350 of the three-phase winding 350.

[0055] In some implementations, the three branches 351 are magnetically symmetrical, which helps to eliminate the circulating current among the three branches 351.

[0056] In some implementations, the three branches 351 may include a first branch 3550, a second branch 3560, and a third branch 3570.

[0057] Please see Figures 6 to 8 In some embodiments, the coil 3510 may include a closed segment 3529, an open segment 3525, and two spaced-apart straight segments 3527. One end of each of the two straight segments 3527 is connected to the closed segment 3529 to form a closed state. The open segment 3525 includes a starting end 3511 and a ending end 3513, which are respectively connected to the side of each of the two straight segments 3527 away from the closed segment 3529.

[0058] The first coil 3515, the second coil 3517, and the third coil 3519 each include a straight segment 3527, a closed segment 3529, and an open segment 3525. The first coil 3515, the second coil 3517, and the third coil 3519 may differ in the open segment 3525. Specifically, the starting end 3511 and the ending end 3513 of the first coil 3515 may face the same side. The starting end 3511 and the ending end 3513 of the second coil 3517 face opposite directions. The starting end 3511 and the ending end 3513 of the third coil 3519 may face the same side, but opposite to the orientation of the starting end 3511 and the ending end 3513 of the first coil 3515.

[0059] Understandably, for the starting coil, the starting end 3511 is used for electrical connection with the busbar. Therefore, the starting end 3511 of the starting coil may or may not be located on the extension line of the corresponding straight segment 3527. For the ending coil, the ending end 3513 is used for electrical connection with the busbar. Therefore, the ending end 3513 of the ending coil may or may not be located on the extension line of the corresponding straight segment 3527.

[0060] In some implementations, in the first branch 3550, the two straight segments 3527 of the starting coil can be respectively set in any coil slot 311, thereby eliminating the need to calibrate the position of the starting coil, reducing assembly difficulty and improving assembly efficiency. The starting coils of the second branch 3560 and the third branch 3570 can be arranged adjacently according to the coil slot 311 where the starting coil of the first branch 3550 is located.

[0061] In some embodiments, the 72 coil slots 311 are sequentially: the first coil slot, the second coil slot, the third coil slot, the fourth coil slot... the 69th coil slot, the 70th coil slot, the 71st coil slot and the 72nd coil slot.

[0062] Please see Figure 2 , Figure 4 and Figure 5 In some embodiments, the coil slot 311 may have M coil layers 313 arranged from the slot opening to the bottom of the slot; each branch 351 is formed by connecting multiple first sub-paths and second sub-paths, the first sub-path is formed by sequentially connecting a first coil 3515 and N second coils 3517, and the second sub-path is formed by sequentially connecting a third coil 3519 and N second coils 3517; the first sub-paths and second sub-paths are connected end to end and are arranged alternately, where M = 2N + 2, and N is an integer greater than or equal to 1. Thus, stator cores 310 with an even number of coil layers 313 of 4 or more are all applicable to the stator assembly 31 in the embodiments of this application, thereby expanding the application range of the stator assembly 31.

[0063] As an example, when N is 1, M equals 4. At this time, the number of coil layers 313 is 4. The first sub-route is formed by connecting the first coil 3515 and the second coil 3517 end to end, and the second sub-route is formed by connecting the third coil 3519 and the second coil 3517 end to end.

[0064] As another example, when N is 3, M equals 8. In this case, the number of coil layers 313 is 8. The first sub-route is formed by connecting the first coil 3515 and three second coils 3517 in sequence. The second sub-route is formed by connecting the third coil 3519 and three second coils 3517 in sequence.

[0065] The eight coil layers 313 can be designated as coil layer 1, coil layer 2, coil layer 3, coil layer 4, coil layer 5, coil layer 6, coil layer 7, and coil layer 8. Coil layer 1 and coil layer 8 can be located at the opening and bottom of coil slot 311, respectively. When coil layer 1 is at the opening, coil layer 8 is at the bottom; conversely, when coil layer 1 is at the bottom, coil layer 8 is at the opening. For ease of understanding, the following explanation uses the example of coil layer 1 at the opening and coil layer 8 at the bottom.

[0066] In some implementations, such as Figures 6 to 8 In the figure, dimension 'a' represents the span of the starting end 3511 and the span of the ending end 3513. The span of the starting end 3511 and the ending end 3513 of the first coil 3515 can both be 6 coil slots 311, the span of the starting end 3511 and the ending end 3513 of the second coil 3517 can both be 6 coil slots 311, and the span of the starting end 3511 and the ending end 3513 of the third coil 3519 can both be 6 coil slots 311.

[0067] In this embodiment, the span between the starting end 3511 and the ending end 3513 specifically refers to the number of coil slots 311 spanned by the starting end 3511 and its corresponding straight segment 3527 (the straight segment 3527 connected to the starting end 3511) within the same coil 3510, and the number of coil slots 311 spanned by the ending end 3513 and its corresponding straight segment 3527 (the straight segment 3527 connected to the ending end 3513). For example, taking the first coil 3515 as an example, the straight segments 3527 of the first coil 3515 can be a first straight segment and a second straight segment, and the open segment 3525 includes a first open segment and a second open segment. The first open segment is connected to the first straight segment, and the second open segment is connected to the second straight segment. The starting end 3511 is located in the first open segment, and the ending end 3513 is located in the second open segment. The span between the first straight segment and the starting end 3511 is 6 coil slots 311, and the span between the second straight segment and the ending end 3513 is 6 coil slots 311.

[0068] In some implementations, such as Figures 6 to 8In the figure, b represents the difference in the number of slots 311 in the coils where the two straight segments 3527 are located. The span of the first coil 3515 can be 10 or 12 coil slots 311; the span of N second coils 3517 is 12 coil slots 311 each; the span of the third coil 3519 can be 9, 10, 11, 12, or 13 coil slots 311. Thus, by employing multiple coils 3510, each with one or more spans, the stator assembly 31 can more easily achieve the adjacent positions of the first leads 3521 of multiple branches 351, and the adjacent positions of the second leads 3523 of multiple branches 351.

[0069] It should be noted that the span of the first coil 3515, the span of the second coil 3517, and the span of the third coil 3519 specifically refer to the difference in the number of slots 311 in which the two straight segments 3527 of coil 3510 are located. For example, if the span of the first coil 3515 is 9 slots 311, it means that the first straight segment is located in the 1st slot 311, and the second straight segment is located in the 10th slot 311. The difference in the number of slots 311 in which the first and second straight segments are located is 9 slots 311.

[0070] In some embodiments, the second coil 3517 can be a full-pitch winding or a short-pitch winding. When the span of the second coil 3517 is 12 coil slots 311, the second coil 3517 is a full-pitch winding. When the span of the second coil 3517 is less than 12 coil slots 311, the second coil 3517 is a short-pitch winding, for example, the span of the second coil 3517 is 11 coil slots 311.

[0071] In some implementations, the span of one of the N second coils 3517 can be 11 coil slots 311, and the span of the remaining second coils 3517 can be 12 coil slots 311. There is a short-pitch winding among the N second coils 3517. By setting a short-pitch winding, it is helpful to eliminate harmonics.

[0072] In some implementations, when N is an odd number, the short-pitch windings of the N second coils 3517 can be located in the exact middle of the other second coils 3517, which helps to improve the harmonic cancellation effect. For example, when N is 5, the connection of the N second coils 3517 can be: second coil 3517-span 12, second coil 3517-span 12, second coil 3517-span 11, second coil 3517-span 12, second coil 3517-span 12.

[0073] Please see Figure 2 , Figure 9 , Figure 10 and Figure 11 , Figure 9 , Figure 10 and Figure 11 In the diagram, the horizontal boxes represent coil slots 311, and the vertical boxes represent coil layers 313. Figure 9 , Figure 10 and Figure 11 In the diagram, the two ends of the solid arrow represent the coil slots 311 where the two straight segments 3527 of the coil 3510 are located, and the dashed arrow represents the coil slots 311 that are crossed by the sum of the span of the end 3513 of a coil 3510 and the span of the start end 3511 of the adjacent coil 3510. In the embodiments of this application, the dashed arrows all cross 12 coil slots 311.

[0074] like Figure 2 and Figure 9 As shown, in some embodiments, the first branch 3550 is connected as follows: third coil 3519 - span 9, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 13, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 12, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 11, N second coils 3517; first coil 3515 - span 12, N second coils 3517. Thus, the first branch 3550 can be adapted to stator cores 310 with different numbers of coil layers 313 by adjusting the number of second coils 3517, expanding the application range of the stator assembly 31.

[0075] like Figure 2 and Figure 10 As shown, in some embodiments, the second branch 3560 is connected as follows: third coil 3519 - span 12, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 11, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 9, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 13, N second coils 3517; first coil 3515 - span 12, N second coils 3517. Thus, the second branch 3560 can be adapted to stator cores 310 with different numbers of coil layers 313 by adjusting the number of second coils 3517, expanding the application range of the stator assembly 31.

[0076] like Figure 2 and Figure 11 As shown, in some embodiments, the third branch 3570 is connected as follows: third coil 3519 - span 10, N second coils 3517; first coil 3515 - span 12, N second coils 3517; third coil 3519 - span 11, N second coils 3517; first coil 3515 - span 10, N second coils 3517; third coil 3519 - span 12, N second coils 3517; first coil 3515 - span 10, N second coils 3517; third coil 3519 - span 11, N second coils 3517; first coil 3515 - span 12, N second coils 3517. Thus, the third branch 3570 can be adapted to stator cores 310 with different numbers of coil layers 313 by adjusting the number of second coils 3517, expanding the application range of the stator assembly 31.

[0077] As an example, taking N = 3, M = 8, and one of the three second coils 3517 has a span of 11 coil slots 311, while the other two second coils 3517 each have a span of 12 coil slots 311, the specific connection method of the first branch 3550, the second branch 3560, and the third branch 3570 is as follows:

[0078] like Figure 2 and Figure 9 As shown, Figure 9In the diagram, U1+ represents the first lead-out terminal 3521, and U1- represents the second lead-out terminal 3523. The specific connection method for the first branch 3550 is as follows: Third coil 3519 (starting coil) - span 9, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, Third coil 3519 - span 13, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3519 - span 12 ...2, Second coil 3519 - span 17 - Span 12, Third coil 3519 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 11, Second coil 3517 - Span 12, First coil 3515 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 11, Second coil 3517 - Span 12, Third coil 3519 - Span 11, Second coil 3517 - Span 12, Second coil 3517 - Span 11, Second coil 3517 - Span 12, First coil 3515 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 11, Second coil 3517 (Terminal coil) - Span 12.

[0079] In the first branch 3550, the coil slot 311 spanned by the first coil 3515, the second coil 3517, and the third coil 3519 is as follows: Figure 9 As shown.

[0080] The starting coil of the first branch 3550 can be located in the bottom coil layer 3133 (the 8th coil layer), and the ending coil is located in the next bottom coil layer (the 7th coil layer) adjacent to the bottom coil layer 3133. According to the connection method of the first branch 3550, when the two straight segments 3527 of the starting coil can be located in the 4th coil slot and the 13th coil slot respectively, the two straight segments 3527 of the ending coil are distributed in the 4th coil slot and the 16th coil slot respectively.

[0081] like Figure 2 and Figure 10 As shown, Figure 10In the diagram, U2+ represents the first lead-out terminal 3521, and U2- represents the second lead-out terminal 3523. The connection method for the second branch 3560 is as follows: Third coil 3519 (starting coil) - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, Third coil 3519 - span 11, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3519 - span 11, Second coil 3519 - span 11, Second coil 3519 - span 11, Second coil 3519 - span 12 ...2, Second coil 3519 - span 11, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 517 - span 12, third coil 3519 - span 9, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, third coil 3519 - span 13, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 (terminal coil) - span 12.

[0082] In the second branch 3560, the coil slot 311 spanned by the first coil 3515, the second coil 3517, and the third coil 3519 is as follows: Figure 10 As shown.

[0083] The starting coil of the second branch 3560 can be located in the bottom coil layer 3133, while the ending coil of the second branch 3560 is located in the next bottom coil layer adjacent to the bottom coil layer 3133. When the two straight segments 3527 of the starting coil are respectively located in the 3rd coil slot and the 14th coil slot, according to the connection method of the second branch 3560 described above, the two straight segments 3527 of the ending coil are respectively distributed in the 3rd coil slot and the 15th coil slot.

[0084] like Figure 2 and Figure 11 As shown, Figure 11In the diagram, U3+ represents the first lead-out terminal 3521, and U3- represents the second lead-out terminal 3523. The connection method for the third branch 3570 is as follows: Third coil 3519 (starting coil) - span 10, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 12, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, Third coil 3519 - span 11, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3517 - span 12, First coil 3515 - span 10, Second coil 3517 - span 12, Second coil 3517 - span 11, Second coil 3519 ...2, Second coil 3517 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 12, Second coil 3519 - span 517 - span 12, third coil 3519 - span 12, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, first coil 3515 - span 10, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, third coil 3519 - span 11, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 11, second coil 3517 (terminal coil) - span 12.

[0085] In the third branch 3570, the coil slot 311 spanned by the first coil 3515, the second coil 3517, and the third coil 3519 is as follows: Figure 11 As shown.

[0086] The starting coil of the third branch 3570 can be located in the bottom coil layer 3133, while the ending coil of the third branch 3570 is located in the next bottom coil layer adjacent to the bottom coil layer 3133. When the two straight segments 3527 of the starting coil are respectively located in the second coil slot and the 64th coil slot, according to the connection method of the third branch 3570 described above, the two straight segments 3527 of the ending coil are respectively distributed in the second coil slot and the 14th coil slot.

[0087] In this example, the starting coils of the first branch 3550, the second branch 3560, and the third branch 3570 are all located in the bottom coil layer 3133, and the ending coils of the first branch 3550, the second branch 3560, and the third branch 3570 are all located in the next bottom coil layer adjacent to the bottom coil layer 3133. The two straight segments 3527 of the starting coil of the first branch 3550 are distributed in the 4th and 13th coil slots, the two straight segments 3527 of the starting coil of the second branch 3560 are distributed in the 3rd and 14th coil slots, and the two straight segments 3527 of the starting coil of the third branch 3570 are distributed in the 2nd and 64th coil slots. The first lead-out terminal 3521 of the first branch 3550, the first lead-out terminal 3521 of the second branch 3560, and the first lead-out terminal 3521 of the third branch 3570 are respectively located in the adjacent 4th, 3rd, and 2nd coil slots.

[0088] The two straight segments 3527 of the termination coil of the first branch 3550 are distributed in the 4th and 16th coil slots; the two straight segments 3527 of the termination coil of the second branch 3560 are distributed in the 3rd and 15th coil slots; and the two straight segments 3527 of the termination coil of the third branch 3570 are distributed in the 2nd and 14th coil slots. The second lead-out terminals 3523 of the first branch 3550, the second branch 3560, and the third branch 3570 are located in adjacent 16th, 15th, and 14th coil slots, respectively.

[0089] Thus, the first leads 3521 of the three branches 351 are distributed in adjacent coil slots 311, and the second leads 3523 of the three branches 351 are also distributed in adjacent coil slots 311. This allows the distribution of multiple first leads 3521 to be more concentrated, and the distribution of multiple second leads 3523 to be more concentrated, reducing the difficulty of connecting multiple first leads 3521 of multiple branches 351 to the busbar, and reducing the difficulty of connecting multiple second leads 3523 of multiple branches 351 to the busbar.

[0090] As another example, compared to the previous example, in this example, the span of each of the N second coils 3517 is 12 coil slots 311, and the specific connection methods of the first branch 3550, the second branch 3560 and the third branch 3570 are as follows:

[0091] The connection method of the first branch 3550 is as follows: Third coil 3519 (starting coil) - span 9, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, third coil 3519 - span 13, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3519 ... 17 - Span 12, Third coil 3519 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, First coil 3515 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, Third coil 3519 - Span 11, Second coil 3517 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, First coil 3515 - Span 12, Second coil 3517 - Span 12, Second coil 3517 - Span 12, Second coil 3517 (Terminal coil) - Span 12.

[0092] Compared to the connection method of the first branch 3550 in the previous example, in this example, the number of coil slots 311 spanned by the two straight segments 3527 of the starting coil of the first branch 3550 remains unchanged, and the two straight segments 3527 of the starting coil are still located in the 4th and 13th coil slots, respectively. Understandably, since the span of each of the N second coils 3517 in this example is 12 coil slots 311, the number of coil slots 311 where the two straight segments 3527 of the terminating coil of the first branch 3550 are located increases by one. According to the connection method of the first branch 3550 described above, the two straight segments 3527 of the terminating coil are located in the 5th and 17th coil slots, respectively.

[0093] The connection method of the second branch 3560 is as follows: Third coil 3519 (starting coil) - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, third coil 3519 - span 11, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3519 - span 11, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3519 ... 517 - span 12, third coil 3519 - span 9, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, third coil 3519 - span 13, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 (terminal coil) - span 12.

[0094] Compared to the connection method of the second branch 3560 in the previous example, in this example, the number of coil slots 311 spanned by the two straight segments 3527 of the starting coil of the second branch 3560 remains unchanged, and the two straight segments 3527 of the starting coil are still respectively located in the 3rd and 14th coil slots. Understandably, since the span of each of the N second coils 3517 in this example is 12 coil slots 311, the number of coil slots 311 where the two straight segments 3527 of the terminating coil of the second branch 3560 are located increases by one. According to the connection method of the second branch 3560 described above, the two straight segments 3527 of the terminating coil are respectively located in the 4th and 16th coil slots.

[0095] The connection method of the third branch 3570 is as follows: Third coil 3519 (starting coil) - span 10, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, third coil 3519 - span 11, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 10, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3519 - span 1 ... 517 - span 12, third coil 3519 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 10, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, third coil 3519 - span 11, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, first coil 3515 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 - span 12, second coil 3517 (terminal coil) - span 12.

[0096] Compared to the connection method of the third branch 3570 in the previous example, in this example, the number of coil slots 311 spanned by the two straight segments 3527 of the starting coil of the third branch 3570 remains unchanged, and the two straight segments 3527 of the starting coil are still respectively located in the 2nd coil slot and the 64th coil slot. Understandably, since the span of each of the N second coils 3517 in this example is 12 coil slots 311, the number of coil slots 311 where the two straight segments 3527 of the terminating coil of the third branch 3570 are located increases by one. According to the connection method of the third branch 3570 described above, the two straight segments 3527 of the terminating coil are respectively located in the 3rd coil slot and the 15th coil.

[0097] In this example, the positions of the first lead 3521 of the starting coil of the first branch 3550, the first lead 3521 of the starting coil of the second branch 3560, and the first lead 3521 of the starting coil of the third branch 3570 are the same as in the previous example, and will not be repeated. The two straight segments 3527 of the terminating coil of the first branch 3550 are distributed in the 5th and 17th coil slots, the two straight segments 3527 of the terminating coil of the second branch 3560 are distributed in the 4th and 16th coil slots, and the two straight segments 3527 of the terminating coil of the third branch 3570 are distributed in the 3rd and 15th coil slots. Therefore, the second lead 3523 of the first branch 3550, the second lead 3523 of the second branch 3560, and the second lead 3523 of the third branch 3570 are respectively located in the adjacent 17th, 16th, and 15th coil slots.

[0098] Thus, the first leads 3521 of the three branches 351 are distributed in adjacent coil slots 311, and the second leads 3523 of the three branches 351 are also distributed in adjacent coil slots 311. This allows the distribution of multiple first leads 3521 to be more concentrated, and the distribution of multiple second leads 3523 to be more concentrated, reducing the difficulty of connecting multiple first leads 3521 of multiple branches 351 to the busbar, and reducing the difficulty of connecting multiple second leads 3523 of multiple branches 351 to the busbar.

[0099] In the stator assembly 31, motor 30, and vehicle 1 provided in this application embodiment, the stator assembly 31 includes a stator core 310 and a winding 350. The inner wall of the stator core 310 has 72 coil slots 311 distributed circumferentially. The direction from the slot opening to the bottom of the coil slot 311 is the radial direction of the stator core 310. Multiple coil layers 313 are arranged in the coil slots 311 from the slot opening to the bottom. The winding 350 includes three parallel branches 351, each branch 351 being formed by multiple coils 3510 connected sequentially. Each coil 3510 has a starting end 3511 and an ending end 3513. The starting end 3511 and the ending end 3513 of the same coil 3510 are located in different coil slots 31. 1. In the same branch 351, the starting end 3511 of a coil 3510 is electrically connected to the ending end 3513 of an adjacent coil 3510, and is stacked on two adjacent coil layers 313. Multiple coils 3510 include a first coil 3515, a second coil 3517, and a third coil 3519. The first coil 3515 and the third coil 3519 are respectively distributed in the first coil layer 3131 and the bottom coil layer 3133, and both span the same layer. The second coil 3517 is located in the coil layer 313 between the first coil layer 3131 and the bottom coil layer 3133, and spans two adjacent coil layers 313. The starting and ending coils 3510 of each branch 351 are the starting coil and the ending coil, respectively. The starting ends 3511 of the starting coils of the three branches 351 are all located in the same layer of the coil layer 313 and in adjacent coil slots 311, which helps to shorten the distance between the starting ends 3511 of the starting coils of the three branches 351. The termination ends 3513 of the termination coils of the three branches 351 are all located on the same layer of the coil layer 313 and in adjacent coil slots 311, which helps to shorten the distance between the termination ends 3513 of the termination coils of the three branches 351, thereby reducing the difficulty of connecting the three branches 351 to other structures and reducing the connection cost.

[0100] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a mechanical connection; they can be a direct connection or an indirect connection via an intermediate medium; they can refer to the internal communication of two components; they can refer to mere surface contact; or they can refer to surface contact connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0101] Furthermore, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as referring to specific or particular structures. The terms "some embodiments," "other embodiments," 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 application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this application, as well as the features of different embodiments or examples.

[0102] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A stator assembly, characterized in that, include: The stator core has 72 coil slots distributed along the circumferential direction on its inner wall. The direction from the slot opening to the bottom of the slot is the radial direction of the stator core. M coil layers are arranged in the coil slot from the slot opening to the bottom of the slot. as well as The winding includes three parallel branches, each branch consisting of multiple coils connected sequentially. Each coil has a start end and a stop end, with the start end and stop end of the same coil located in different coil slots. Within the same branch, the start end of one coil is electrically connected to the stop end of an adjacent coil and stacked on two adjacent coil layers. The multiple coils include a first coil, a second coil, and a third coil. The first coil and the third coil are respectively distributed in the first coil layer and the bottom coil layer, and both span the same layer. The second coil is located in the coil layer between the first coil layer and the bottom coil layer, and spans two adjacent coil layers. The coils at the beginning and end of each branch are respectively the starting coil and the ending coil. The starting ends of the starting coils of the three branches are all located on the same layer of the coil layer and in adjacent coil slots. The ending ends of the ending coils of the three branches are all located on the same layer of the coil layer and in adjacent coil slots. Each branch is formed by connecting multiple first sub-paths and second sub-paths. The first sub-path is formed by connecting a first coil and N second coils in sequence, and the second sub-path is formed by connecting a third coil and N second coils in sequence. The first sub-path and the second sub-path are connected end to end and are alternately arranged. Wherein, M=2N+2, and N is an integer greater than or equal to 1. The span of the first coil is 10 or 12 of the coil slots; The span of each of the N second coils is 12 coil slots; The span of the third coil is 9, 10, 11, 12, or 13 coil slots.

2. The stator assembly according to claim 1, characterized in that, The span of the first coil is 10 or 12 of the coil slots; One of the N second coils has a span of 11 coil slots, and the spans of the remaining second coils are all 12 coil slots; The span of the third coil is 9, 10, 11, 12, or 13 coil slots.

3. The stator assembly according to claim 1 or 2, characterized in that, The three branches include a first branch, which is connected in the following manner: the third coil - a span of 9 and N second coils; the first coil - a span of 12 and N second coils; the third coil - a span of 13 and N second coils; the first coil - a span of 12 and N second coils; the third coil - a span of 12 and N second coils; the first coil - a span of 12 and N second coils; the third coil - a span of 11 and N second coils; and the first coil - a span of 12 and N second coils.

4. The stator assembly according to claim 3, characterized in that, The three branches also include a second branch, which is connected as follows: the third coil - the span is 12 and N second coils, the first coil - the span is 12 and N second coils, the third coil - the span is 11 and N second coils, the first coil - the span is 12 and N second coils, the third coil - the span is 9 and N second coils, the first coil - the span is 12 and N second coils, the third coil - the span is 13 and N second coils, and the first coil - the span is 12 and N second coils.

5. The stator assembly according to claim 4, characterized in that, The three branches also include a third branch, which is connected as follows: the third coil - the span is 10, N second coils; the first coil - the span is 12, N second coils; the third coil - the span is 11, N second coils; the first coil - the span is 10, N second coils; the third coil - the span is 12, N second coils; the first coil - the span is 10, N second coils; the third coil - the span is 11, N second coils; the first coil - the span is 12, N second coils.

6. The stator assembly according to claim 1, characterized in that, The stator assembly includes three-phase windings, and each phase of the windings has the same structure.

7. The stator assembly according to claim 1, characterized in that, The three branches are magnetically symmetrical.

8. An electric motor, characterized in that, include: Rotor; as well as The stator assembly according to any one of claims 1 to 7.

9. A vehicle, characterized in that, include: Vehicle body; And the motor according to claim 8, wherein the motor is mounted on the vehicle body.

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