Multi-branch winding structure, stator assembly and electric machine

Abstract

The application relates to a multi-branch winding structure, a stator assembly and a motor. The multi-branch winding structure comprises winding circuits of three phases and star point copper bars. The winding circuit of any phase comprises n parallel winding branches. The outgoing positions of the 3n winding branches of the three phases are sequentially and spacedly arranged along the circumference of a core member. The three outgoing positions continuously along the circumference of the core member correspond to one winding branch of the three phases respectively, and at least two outgoing positions correspond to different winding branches of the three phases. The number of the star point copper bars is n. Any star point copper bar is connected with the three outgoing positions continuously along the circumference of the core member, and the n star point copper bars are spacedly arranged along the circumference. The application can reduce the circumferential interference between the star point copper bars, reduce the bending positions of the star point copper bars, avoid the radial displacement arrangement of the adjacent two star point copper bars, simplify the structure of the star point copper bars and improve the vibration resistance of the star point copper bars.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a multi-branch winding structure, stator assembly, and motor. Background Technology

[0002] like Figure 1 As shown, the stator assembly of the motor may include a core 400 and a winding structure wound on the core 400. (Combined with...) Figure 2 The winding structure can be a three-phase winding structure, which can include three phase winding lines. These three phase winding lines can be connected to the star-point copper busbar 100 to form a three-phase circuit. Each phase winding line can include several parallel winding branches. When connecting the star-point copper busbar 100, a star connection can be used to reduce the circumferential span of the star-point copper busbar 100, thereby reducing its size. Specifically, the star-point copper busbar 100 can correspond one-to-one with several winding branches, and the star-point copper busbar 100 can be connected to the output positions of the corresponding winding branches of the three phases. For example... Figure 2 As shown, for example, the three phases of the winding structure are phase U, phase V and phase W. Each phase includes four winding branches. The output positions of the four winding branches of phase U are X1, X2, X3 and X4, the output positions of the four winding branches of phase V are Y1, Y2, Y3 and Y4, and the output positions of the four winding branches of phase W are W1, W2, W3 and W4. At this time, there are four star copper busbars 100 to correspond to the four winding branches. The star copper busbar 100 corresponding to the first winding branch is connected to X1, Y1 and Z1. The other three star copper busbars 100 are connected in the same way. However, in the existing winding structure, there are cases where the output positions of the same winding branch of three phases are not continuously set along the circumference. For example, in the same winding branch, there is also X2 between "Y1 and Z1". In this case, the four star copper busbars 100 overlap along the circumference. In order to avoid short circuit, the four star copper busbars 100 need to be set at intervals. The common methods include bending part of the star copper busbar 100 and setting adjacent two star copper busbars 100 radially offset. This makes the structure of the star copper busbar 100 complex, which in turn reduces the vibration resistance of the star copper busbar 100 and results in a high scrap rate during stamping. Summary of the Invention

[0003] Based on this, this application provides a multi-branch winding structure, stator assembly, and motor to improve the problems in the prior art where the three-phase winding branches of the winding structure are connected to the star-point copper busbar using a star connection method, resulting in a complex structure of the star-point copper busbar, reduced vibration resistance, and high scrap rate during stamping.

[0004] In a first aspect, this application provides a multi-branch winding structure for use in a stator assembly. The stator assembly further includes a core component. The multi-branch winding structure is disposed on the core component. The multi-branch winding structure includes three-phase winding lines and star-point copper busbars. Each phase winding line includes n parallel winding branches, where n is a positive integer not less than 2. The outgoing positions of the three phases' 3n winding branches are sequentially spaced along the circumference of the core component. Three consecutive outgoing positions along the circumference of the core component correspond to one of the winding branches of the three phases, and at least two outgoing positions correspond to different winding branches of the three phases. The number of star-point copper busbars is n. Each star-point copper busbar is connected to three consecutive outgoing positions along the circumference of the core component, and the n star-point copper busbars are spaced apart along the circumference.

[0005] In one embodiment, the star-shaped copper busbar includes a first copper busbar component and copper busbar terminals. The copper busbar terminals are provided with three terminals to be connected to one of the outgoing line positions respectively. The first copper busbar component is connected to the three copper busbar terminals.

[0006] In one embodiment, the three-phase winding lines are wound on the iron core to form a winding body structure, the winding body structure extending out of the iron core at both ends along the axial direction of the iron core, and the star-shaped copper busbar is disposed on one side of the end face of the winding body structure.

[0007] In one embodiment, the outgoing positions of the three phases totaling 3n winding branches are located at the innermost or outermost radial side of the winding body structure, and the first copper busbar is located at the middle radial position of the winding body structure.

[0008] In one embodiment, the multi-branch winding structure further includes phase copper busbars, which are configured to have three phase copper busbars that correspond one-to-one with the three phases. The phase copper busbars are connected to the input positions of the n winding branches of their corresponding phases.

[0009] In one embodiment, the phase copper busbar includes a second copper busbar component and a busbar. The busbar is configured to have n busbars, with each of the n winding branches of the phase corresponding to the phase copper busbar corresponding to one of the n busbars of the phase copper busbar. One end of the busbar is connected to the inlet position of the winding branch, and the second copper busbar component is connected to the other end of the n busbars of the phase copper busbar.

[0010] In one embodiment, the busbars extend at least in the middle along the circumferential direction of the winding body structure and are all disposed on the outer peripheral side of the end of the winding body structure.

[0011] In one embodiment, the three phases of the multi-branch winding structure are U-phase, V-phase, and W-phase, respectively. The core has 60 stator slots arranged circumferentially, and each stator slot has 8 slot layers (L1-L8) arranged radially along the core, n=4. The first winding branch of the U-phase is:

[0012] 1L1-13L2-2L1-14L2-3L1-15L2-4L1-16L2-5L1-17L2-5L3-17L4-4L3-16L4-3L3-15L4-2L3-14L4-1L3-13L4- 1L5-13L6-2L5-14L6-3L5-15L6-4L5-16L6-5L5-17L6-5L7-17L8-4L7-16L8-3L7-15L8-2L7-14L8-1L7-13L8;

[0013] The second winding branch of phase U is:

[0014] 28L8-16L7-29L8-17L7-30L8-18L7-31L8-19L7-32L8-20L7-32L6-20L5-31L6-19L5-30L6-18L5-29L6-17L5-28L6-16L5- 28L4-16L3-29L4-17L3-30L4-18L3-31L4-19L3-32L4-20L3-32L2-20L1-31L2-19L1-30L2-18L1-29L2-17L1-28L2-16L1;

[0015] The third winding branch of phase U is:

[0016] 31L1-43L2-32L1-44L2-33L1-45L2-34L1-46L2-35L1-47L2-35L3-47L4-34L3-46L4-33L3-45L4-32L3-44L4-31L3-43L4 -3L5-43L6-32L5-44L6-33L5-45L6-34L5-46L6-35L5-47L6-35L7-47L8-34L7-46L8-33L7-45L8-32L7-44L8-31L7-43L8;

[0017] The fourth winding branch of phase U is:

[0018] 58L8-46L7-59L8-47L7-60L8-48L7-61L8-49L7-62L8-50L7-62L6-50L5-61L6-49L5-60L6-48L5-59L6-47L5-58L6-46L5- 58L4-46L3-59L4-47L3-60L4-48L3-61L4-49L3-62L4-50L3-62L2-50L1-61L2-49L1-60L2-48L1-59L2-47L1-58L2-46L1;

[0019] The winding lines of the V phase and the winding lines of the U phase are obtained by sequentially shifting the winding lines of the U phase by 10 and 20 stator slots, respectively.

[0020] Secondly, this application provides a stator assembly, which includes any of the multi-branch winding structures provided in this application.

[0021] Thirdly, this application provides an electric motor, which includes any of the stator components provided in this application.

[0022] This application connects the star-shaped copper busbars to the output positions of the different winding branches of the three phases. In a multi-branch winding structure, where the output positions of the three phases (a total of 3n winding branches) are such that every three consecutive output positions correspond to one winding branch of the three phases, and at least two winding branches are different winding branches of the three phases, the interference between the star-shaped copper busbars along the circumference is reduced, thereby reducing the bending parts of the star-shaped copper busbars. At the same time, it avoids the radial misalignment of two adjacent star-shaped copper busbars, thus simplifying the star-shaped copper busbar structure, improving the vibration resistance of the star-shaped copper busbars, and facilitating the stamping process of the star-shaped copper busbars. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a stator assembly provided for the prior art;

[0024] Figure 2 A winding diagram for a multi-branch winding structure provided for existing technology;

[0025] Figure 3 This is a winding diagram of the star-shaped copper busbar shown in Embodiment 1 of this application for the multi-branch winding structure.

[0026] Figure 4 A schematic diagram of the stator assembly to which the multi-branch winding structure provided in Embodiment 1 of this application is applicable;

[0027] Figure 5 A schematic diagram of the star-shaped copper busbar with a multi-branch winding structure provided in Embodiment 1 of this application;

[0028] Figure 6 for Figure 4 Enlarged view of section A;

[0029] Figure 7 This is a winding diagram of the multi-branch winding structure shown in Embodiment 1 of this application when the phase copper busbar is exposed;

[0030] Figure 8 This is a schematic diagram of the phase copper busbar of the multi-branch winding structure provided in Embodiment 1 of this application;

[0031] Figure 9 The winding diagram is for the winding circuit of the U-phase of the multi-branch winding structure provided in Embodiment 1 of this application;

[0032] Figure 10 This is a schematic diagram of the lapped coil structure of the multi-branch winding structure provided in Embodiment 1 of this application.

[0033] Reference numerals: 100, star-shaped copper busbar; 110, first copper busbar component; 120, copper busbar terminal; 200, phase copper busbar; 210, second copper busbar component; 220, busbar; 230, fixed structure; 300, winding body structure; 310, lapped coil; 311, effective lapped edge; 312, lapped welding end; 313, lapped hairpin end; 320, welding terminal; 400, iron core component; 410, stator slot. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0036] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0037] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They 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, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Example 1

[0039] Embodiment 1 of this application provides a multi-branch winding structure, such as Figures 3 to 10 As shown, a multi-branch winding structure is used in the stator assembly, which also includes a core 400. The multi-branch winding structure is disposed on the core 400. The multi-branch winding structure includes three phase winding lines and star copper busbars 100. Each phase winding line includes n parallel winding branches, where n is a positive integer. The outgoing positions of the three phases' 3n winding branches are arranged sequentially and spaced along the circumference of the core 400. Three consecutive outgoing positions along the circumference of the core 400 correspond to one of the three phase winding branches, and at least two outgoing positions correspond to different winding branches of the three phases. There are n star copper busbars 100. Each star copper busbar 100 is connected to three consecutive outgoing positions along the circumference of the core 400. The n star copper busbars 100 are arranged spaced along the circumference.

[0040] like Figure 3 and Figure 4 As shown in this embodiment, the stator assembly may include a core 400 and a winding structure wound on the core 400. The stator assembly may have three phases, and correspondingly, the winding structure may include winding lines for three phases. For any phase winding line, it includes n parallel winding branches, where n is a positive integer not less than 2, such as n = 2, 3, or 4, so that the winding structure constitutes a multi-branch winding structure. For any winding branch, it may include several hairpin coils, which are connected in pairs. Of course, in some embodiments, any winding branch may also be formed by continuously winding one or several conductors.

[0041] like Figure 3As shown, any winding branch exits from a designated exit position during winding. It is easy to see that the 3n winding lines of the three phases can form 3n spaced exit positions along the circumference of the core 400. Among these 3n spaced exit positions along the circumference of the core 400, three consecutive exit positions correspond to one of the winding branches of each of the three phases, and at least two exit positions correspond to different winding branches of the three phases. Of the 3n winding branches of the three phases, the three first winding branches of the three phases are identical, and any second winding branch of the three phases is different from the other two first winding branches.

[0042] like Figure 3 As shown, for example, the three phases of the stator assembly can be phase U, phase V, and phase W. The winding circuit of any phase includes four winding branches; the four winding branches of phase U can be U1X1, U2X2, U3X3, and U4X4, while the four winding branches of phase V can be V1Y1, V2Y2, V3Y3, and V4Y4, and the four winding branches of phase W can be W1Z1, W2Z2, W3Z3, and W4Z4. U1X1, V1Y1, and W1Z1 are the first winding branches of phases U, V, and W, respectively; therefore, U1X1, V1Y1, and W1Z1 constitute the same winding branch. U1X1 and V1Y1 are the first winding branches of phase U and phase V, respectively, and W2Z2 is the second winding branch of phase W. Therefore, U1X1 and V1Y1 are different winding branches from W2Z2. Furthermore, U1X1 is the first winding branch of phase U, V2Y2 is the second winding branch of phase V, and W3Z3 is the third winding branch of phase W. Therefore, U1X1, V2Y2, and W3Z3 are different winding branches from each other.

[0043] The outgoing wire positions of the four winding branches of phase U can be X1, X2, X3, and X4; the outgoing wire positions of the four winding branches of phase V can be Y1, Y2, Y3, and Y4; and the outgoing wire positions of the four winding branches of phase W can be Z1, Z2, Z3, and Z4. For example, three consecutive outgoing wire positions along the 400° circumference of the core can be X1, Y2, and Z1, corresponding to phases U, V, and W respectively, with phases U and V being different winding branches from phase W. Alternatively, three consecutive outgoing wire positions along the 400° circumference of the core can be X1, Y2, and Z3, corresponding to phases U, V, and W respectively, with phases U, V, and W being different winding branches from each other.

[0044] like Figure 3 and Figure 4As shown, in this embodiment, the multi-branch winding structure may further include star-point copper busbars 100. The star-point copper busbars 100 are used to connect to the outgoing positions of the winding branches of the three phases, so that the winding lines of the three phases constitute a three-phase circuit. The number of star-point copper busbars 100 can be the same as the number of winding branches of any phase, i.e., n. The outgoing positions of the three phases' total 3n winding branches can be grouped into n groups of three consecutive positions. Each of the n groups of outgoing positions corresponds one-to-one with one of the n star-point copper busbars 100, and each star-point copper busbar 100 is connected to its corresponding three outgoing positions. Furthermore, the n star-point copper busbars 100 are spaced circumferentially between each other along the core component 400.

[0045] It is understood that by connecting the star copper busbar 100 to the output positions of the different winding branches of the three phases, this application can reduce the circumferential interference between the star copper busbars 100 when the output positions of the three phases and a total of 3n winding branches in the multi-branch winding structure are such that every three consecutive output positions correspond to one winding branch of the three phases and at least two winding branches are different winding branches of the three phases. This reduces the bending parts of the star copper busbar 100 and avoids the radial misalignment of two adjacent star copper busbars 100, thereby simplifying the structure of the star copper busbar 100, improving the vibration resistance of the star copper busbar 100, and facilitating the stamping process of the star copper busbar 100.

[0046] Specifically, the star-shaped copper busbar 100 includes a first copper busbar component 110 and copper busbar terminals 120. Three copper busbar terminals 120 are provided to be connected to one outgoing line position respectively. The first copper busbar component 110 is connected to the three copper busbar terminals 120.

[0047] like Figure 3 and Figure 5 As shown in this embodiment, the star-shaped copper busbar 100 may include a first copper busbar component 110 and copper busbar terminals 120, which can be integrally formed. There may be three copper busbar terminals 120, each corresponding to one of the three outgoing wire positions of the star-shaped copper busbar 100. For example, the three copper busbar terminals 120 of the star-shaped copper busbar 100 corresponding to outgoing wire positions X1, Y2, and Z1 are respectively connected to X1, Y2, and Z1, and the connection method can be welding. The first copper busbar component 110 is connected to all three copper busbar terminals 120, so that the outgoing wire positions of the three winding branches form a "star point".

[0048] It is understood that by setting the star-shaped copper busbar 100 as three copper busbar terminals 120 and a first copper busbar component 110 connecting the three copper busbar terminals 120, the star-shaped copper busbar 100 can have a relatively simple structure, which facilitates its preparation and processing when the star-shaped copper busbar 100 is manufactured using a stamping process, while reducing its scrap rate.

[0049] More specifically, the winding lines of the three phases are wound on the iron core 400 to form a winding body structure 300. The winding body structure 300 extends out of the iron core 400 at both ends along the axial direction of the iron core 400, and the star copper busbars 100 are all set on one side of the end face of the winding body structure 300.

[0050] like Figure 4 As shown in this embodiment, by way of example, when the winding lines of all three phases are wound on the core 400, the winding lines of the three phases can form a winding body structure 300. The winding body structure 300 can be coaxially arranged with the core 400, and both ends of the winding body structure 300 in the axial direction can extend out of the core 400. The star-shaped copper busbar 100 can be arranged at one end of the winding body structure 300 formed by the winding lines of the three phases, and located on one side of its end face.

[0051] It is understood that in this embodiment, by setting the star-point copper busbar 100 on one side of the end face of the winding body structure 300 formed by the winding lines of the three phases, it is convenient to connect the star-point copper busbar 100 with the outgoing positions of the winding lines of the three phases.

[0052] More specifically, the outlet positions of the three phases with a total of 3n winding branches are set at the innermost or outermost radial side of the winding body structure 300, and the first copper busbar 110 is set at the middle position radially of the winding body structure 300.

[0053] like Figure 4 and Figure 6 As shown in this embodiment, for any winding branch, its exit position can extend a short distance along the axial direction of the winding body structure 300 to form a welding terminal 320. The exit positions of the 3n winding branches of the three phases can be located at the innermost or outermost radial side of the winding body structure 300, that is, the welding terminal 320 can be located at the innermost or outermost radial side of the winding body structure 300. For example, when n=4, among the exit positions of the four winding branches of any phase winding line, two are located at the innermost radial side of the winding body structure 300, and the other two are located at the outermost radial side of the winding body structure 300. When the star copper busbar 100 is connected to the exit position of its corresponding winding branch, it can specifically be that the copper busbar terminal 120 is connected to the welding terminal 320, and the connection method can also be welding. At this time, the first copper busbar 110 can be arranged between the innermost and outermost sides of the winding body structure 300 in the radial direction, that is, the middle position in the radial direction of the winding body structure 300; while the copper busbar terminal 120 can be arranged in the width direction of the first copper busbar 110 so as to be connected to the welding terminal 320.

[0054] It is understood that in this embodiment, by setting the outlet positions of the three phases and a total of 3n winding branches at the innermost or outermost radial side of the winding body structure 300, and setting the first copper busbar 110 at the middle radial position of the winding body structure 300, it is convenient to arrange the star copper busbar 100 on one side of the end face of the winding body structure 300 formed by the winding lines of the three phases, so as to achieve a stable connection between the star copper busbar 100 and the winding lines of the three phases, thereby improving the vibration resistance of the star copper busbar 100.

[0055] More specifically, the multi-branch winding structure also includes phase copper busbars 200, which are set to 3 and correspond one-to-one with the three phases. The phase copper busbars 200 are connected to the input positions of the n winding branches of their corresponding phases.

[0056] like Figure 4 and Figure 7 As shown in this embodiment, the multi-branch winding structure further includes phase copper busbars 200, which are used to connect to the input positions of the winding branches of the three phases, so that the winding lines of the three phases constitute a three-phase circuit. The number of phase copper busbars 200 can correspond to the number of phases, i.e., it is set to 3. Each phase copper busbar 200 is connected to the input positions of the n winding branches of its corresponding phase, so that the n winding branches of that phase are connected in parallel.

[0057] In the aforementioned example, when the winding circuit of any phase includes 4 winding branches, and the 4 winding branches of phase U can be U1X1, U2X2, U3X3 and U4X4 respectively, the 4 winding branches of phase V can be V1Y1, V2Y2, V3Y3 and V4Y4 respectively, and the 4 winding branches of phase W can be W1Z1, W2Z2, W3Z3 and W4Z4 respectively, the input positions of the 4 winding branches of phase U can be U1, U2, U3 and U4 respectively, the input positions of the 4 winding branches of phase V are V1, V2, V3 and V4, and the input positions of the 4 winding branches of phase W are W1, W2, W3 and W4. The phase copper busbar 200 corresponding to U can be called the U phase copper busbar 200, which is connected to W1, W2, W3 and W4.

[0058] It is understood that by setting the phase copper busbar 200, this embodiment facilitates the formation of a three-phase circuit in the multi-branch winding structure, so that the multi-branch winding structure can meet the usage requirements.

[0059] More specifically, the phase copper busbar 200 includes a second copper busbar component 210 and busbars 220. The busbars 220 are configured to be n, and the n winding branches of the phase corresponding to the phase copper busbar 200 correspond one-to-one with the n busbars 220 of the phase copper busbar 200. One end of the busbar 220 is connected to the input position of the winding branch, and the second copper busbar component 210 is connected to the other end of the n busbars 220 of the phase copper busbar 200.

[0060] like Figure 7 and Figure 8 As shown in this embodiment, the phase copper busbar 200 may include a second copper busbar component 210 and busbars 220, wherein the busbars 220 may be configured as n, each corresponding one-to-one with the n winding branches of the phase copper busbar 200; one end of the busbar 220 can be connected to the input position of the corresponding winding branch, and the connection method may be welding. The second copper busbar component 210 connects the other ends of the n busbars 220 to achieve the purpose of parallel connection of the n winding branches; the connection method between the second copper busbar component 210 and the other end of the busbar 220 may also be welding.

[0061] It is understood that in this embodiment, by setting the star-point copper busbar 100 as n busbars 220 and connecting the ends of the n busbars 220 to the second copper busbar 210, it is convenient that the second copper busbar 210 is connected to the input position of the n winding branches of its corresponding phase.

[0062] More specifically, the busbar 220 extends at least in the middle along the circumferential direction of the winding body structure 300, and is disposed on the outer peripheral side of the end of the winding body structure 300.

[0063] like Figure 4 As shown in this embodiment, the busbar 220 can be configured as a circular strip structure, which can be made of a conductive material and has elasticity. For example, the busbar 220 can be a circular strip structure made of copper. The second copper busbar members 210 of the three phase copper busbars 200 can be arranged adjacent to each other along the circumference of the winding body structure 300 to facilitate their centralized lead-out. The busbar 220 can extend from the second copper busbar member 210 to the entry position of its corresponding winding branch, and during the extension, the middle part of the busbar 220 can extend along the circumference of the winding body structure 300 and be disposed on the outer peripheral side of the end of the winding body structure 300. In order to avoid short circuit due to contact between the busbar 220 and the winding body structure 300, the busbar 220 can also be spaced apart from the winding body structure 300 by a fixing structure 230, which can be an injection-molded insulating component. As several busbars 220 extend, the fixing structure 230 can simultaneously connect several busbars 220 of different rows, and the busbars 220 of different phase copper busbars 200 are spaced apart. At this time, the fixing structure 230 can further improve the stability of the connection between the three phase copper busbars 200 and the winding circuit of the three phases. For any winding branch, its entry position can also extend a short distance along the axial direction of the winding body structure 300 to form the aforementioned welding terminal 320. When the phase copper busbar 200 is connected to the winding branch, it can be that the end of the busbar 220 is connected to the welding terminal 320, and the connection method can also be welding.

[0064] like Figure 4 and Figure 5 As shown, in this embodiment, when n=4, and among the four winding branches of any phase winding circuit, there are two entry positions located on the innermost radial side of the winding body structure 300, and the other two located on the outermost radial side of the winding body structure 300, the busbar 220 connecting to the two entry positions located on the innermost radial side of the winding body structure 300 needs to cross the winding body structure 300 radially, that is, it needs to extend from the outermost to the innermost side of the winding body structure 300. This would cause interference with the star-point copper busbar 100. In this case, the first copper busbar 110 of the star-point copper busbar 100 can be bent along the axial direction of the winding body structure 300, and the busbar 220 can pass directly below the bent portion of the first copper busbar 110. Of course, in some embodiments, the busbar 220 can also cross directly above the first copper busbar 110. The busbar 220, which is connected to the two outermost inlet positions in the radial direction of the winding body structure 300, does not need to cross the winding body structure 300 in the radial direction, so there is no interference between it and the star copper busbar 100.

[0065] It is understood that by extending the middle part of the busbar 220 along the circumference of the winding body structure 300 and setting it on the outer periphery of the winding body structure 300, this embodiment can minimize the interference between the phase copper busbar 200 and the star copper busbar 100 arranged on one side of the end face of the winding body structure 300. This ensures that the star copper busbar 100 has a relatively simple structure, making it easier to maintain stability after being connected to the winding lines of the three phases, and also facilitating its processing.

[0066] More specifically, the three phases of the multi-branch winding structure are the U phase, V phase, and W phase. The core 400 has 60 stator slots 410 arranged circumferentially. Each stator slot 410 has 8 slot layers (L1-L8) arranged radially along the core 400, with n=4. The first winding branch of the U phase is:

[0067] 1L1-13L2-2L1-14L2-3L1-15L2-4L1-16L2-5L1-17L2-5L3-17L4-4L3-16L4-3L3-15L4-2L3-14L4-1L3-13L4- 1L5-13L6-2L5-14L6-3L5-15L6-4L5-16L6-5L5-17L6-5L7-17L8-4L7-16L8-3L7-15L8-2L7-14L8-1L7-13L8;

[0068] The second winding branch of phase U is:

[0069] 28L8-16L7-29L8-17L7-30L8-18L7-31L8-19L7-32L8-20L7-32L6-20L5-31L6-19L5-30L6-18L5-29L6-17L5-28L6-16L5- 28L4-16L3-29L4-17L3-30L4-18L3-31L4-19L3-32L4-20L3-32L2-20L1-31L2-19L1-30L2-18L1-29L2-17L1-28L2-16L1;

[0070] The third winding branch of phase U is:

[0071] 31L1-43L2-32L1-44L2-33L1-45L2-34L1-46L2-35L1-47L2-35L3-47L4-34L3-46L4-33L3-45L4-32L3-44L4-31L3-43L4 -3L5-43L6-32L5-44L6-33L5-45L6-34L5-46L6-35L5-47L6-35L7-47L8-34L7-46L8-33L7-45L8-32L7-44L8-31L7-43L8;

[0072] The fourth winding branch of phase U is:

[0073] 58L8-46L7-59L8-47L7-60L8-48L7-61L8-49L7-62L8-50L7-62L6-50L5-61L6-49L5-60L6-48L5-59L6-47L5-58L6-46L5- 58L4-46L3-59L4-47L3-60L4-48L3-61L4-49L3-62L4-50L3-62L2-50L1-61L2-49L1-60L2-48L1-59L2-47L1-58L2-46L1;

[0074] The winding lines of the V phase and the U phase are obtained by sequentially shifting the winding lines of the U phase by 10 and 20 stator slots 410, respectively.

[0075] like Figure 3 As shown in this embodiment, by way of example, the three phases of the multi-branch winding structure can be phase U, phase V, and phase W, where "U", "V", and "W" are only for the convenience of describing the three phases of the multi-branch winding structure and are not intended to limit them in any way. In some embodiments, the three phases of the multi-branch winding structure may also be represented by other notations.

[0076] In this embodiment, the core component 400 may have 60 stator slots 410 evenly spaced along the circumference, and the middle part of the winding body structure 300 formed by the three-phase winding lines is located in the stator slots 410. Similarly, the numbers "1" to "60" are only for the convenience of describing the 60 stator slots 410 of the core component 400, and are not intended to limit them in any way. At the same time, any stator slot 410 in the circumference of the core component 400 can be regarded as the stator slot 410 with the number "1".

[0077] like Figure 3 As shown, in this embodiment, each stator slot 410 is provided with a total of 8 slot layers, L1-L8, along the radial direction of the core member 400. The slot layers L1 to L8 can be arranged sequentially from the inside to the outside of the radial direction of the core member 400. Similarly, "L1"-"L8" are only for the convenience of describing the 8 slot layers of the stator slot 410 and are not used to limit them in any way. In some embodiments, the 8 slot layers of the stator slot 410 can also be represented by other notations.

[0078] like Figure 9 and Figure 10 As shown, in this embodiment, any winding branch can include several hairpin coils. The following description uses the first winding branch of the U-phase as an example. The first winding branch of the U-phase can employ a lap winding method, in which case the hairpin coil is a lap-wound coil 310, which includes an integrally formed lap-wound effective edge 311, a lap-wound welding end 312, and a lap-wound hairpin end 313. Two lap-wound effective edges 311 are provided, arranged parallel to each other. Two lap-wound welding ends 312 are provided, each corresponding one-to-one with one of the two lap-wound effective edges 311, and both lap-wound welding ends 312 are located at the same end of the two lap-wound effective edges 311, extending in a direction close to each other. One lap-wound hairpin end 313 is provided, which can be shaped like a "V", and the two ends of its "V"-shaped opening can be connected to the other ends of the two lap-wound effective edges 311 respectively. During winding, the two effective winding edges 311 of the lapped coil 310 correspond to two stator slots 410 respectively, and the effective winding edges 311 are arranged within the stator slots 410; the number of stator slots 410 between the two stator slots 410 is the pitch of the lapped coil 310. The lapped hairpin ends 313 of several lapped coils 310 are all located outside the same end of the iron core 400, and the lapped welding ends 312 of several lapped coils 310 are all located outside the other end of the iron core 400. Two consecutive lapped coils 310 are connected through one of their lapped welding ends 312, and the two lapped welding ends 312 can be connected by welding.

[0079] like Figure 9As shown, in the first winding branch of phase U, the winding line corresponding to "1L1-13L2" represents the first lapped coil 310, whose two effective lapped edges 311 are wound in slot L1 (number "1") and slot L2 (number "13") respectively, with a pitch of 12 slots. The subsequent winding lines are similar; the winding line corresponding to "1L7-13L8" represents the last lapped coil 310, whose two effective lapped edges 311 are wound in slot L7 (number "1") and slot L8 (number "13") respectively, with a pitch of 12 slots. It should be noted that the entry point of the first winding branch of phase U is the lapped welding end 312 of the first lapped coil 310 near the effective lapped edge 311 represented by "1L1", as shown in the reference... Figure 5 In U1, the lap-wound welding end 312 extends axially a short distance to form a welding terminal 320, facilitating connection of the busbar 220; and the exit position of the first winding branch of phase U is the lap-wound welding end 312 of the last lap-wound coil 310 near the lap-wound effective edge 311 indicated by "13L8", as shown in the reference. Figure 5 In X1, the overlapping welding end 312 also extends a short distance axially to form a welding terminal 320, so as to facilitate the connection of the copper busbar terminal 120.

[0080] like Figure 9 As shown, the second, third, and fourth winding branches of phase U are similarly handled, with the entry and exit positions of the second winding branch of phase U specified by reference to... Figure 9 The input and output positions of U2 and X2, and the third winding branch of phase U, are respectively referred to Figure 9 The input and output positions of U3 and X3, and the fourth winding branch of phase U, are respectively referred to Figure 9 U4 and X4 in the example.

[0081] like Figure 3 As shown, the winding lines of phase V and phase U can be obtained by sequentially shifting the winding line of phase U by 10 and 20 stator slots 410, respectively. The winding lines of phase V and phase U can be obtained similarly, where the input and output positions of the first winding branch of phase V are determined by referring to... Figure 3 The input and output positions of V1 and Y1, and the second winding branch of phase V, are respectively referred to Figure 3 The input and output positions of V2 and Y2, and the third winding branch of phase V, are respectively referred to Figure 3 The input and output positions of the fourth winding branch of phases V3 and Y3 in the U phase are respectively referred to Figure 3 The input and output positions of the first winding branch of phase W are specified in references V4 and Y4. Figure 3The input and output positions of W1 and Z1, and the second winding branch of phase W, are respectively referred to Figure 3 The input and output positions of W2 and Z2, and the third winding branch of phase W, are respectively referred to Figure 3 The input and output positions of W3 and Z3, and the fourth winding branch of phase W, are respectively referred to Figure 3 W4 and Z4 in the middle.

[0082] like Figure 3 As shown, it is easy to see that in this embodiment, among the 12 outgoing wire positions of the three phases and a total of 12 winding branches, X1, Z4, Y1, X2, Z1, Y2, X3, Z2, Y3, X4, Z3, and Y4 can be sequentially adjacent along the circumference of the iron core 400. These 12 outgoing wire positions can be divided into the following four groups: Y4, X1, and Z4; Y1, X2, and Z1; Y2, X3, and Z2; and Y3, X4, and Z3. The four star-point copper busbars 100 are respectively connected to these four groups of outgoing wire positions.

[0083] In some embodiments, the 12 outgoing cable positions can be divided into the following four groups: X1, Z4, and Y1; X2, Z1, and Y2; X3, Z2, and Y3; X4, Z3, and Y4. In other embodiments, the 12 outgoing cable positions can be divided into the following four groups: Z4, Y1, and X2; Z1, Y2, and X3; Z2, Y3, and X4; Z3, Y4, and X1.

[0084] Of course, in some embodiments, n can also be other positive integers not less than 2, such as 2, 3, and 5; and the number of stator slots 410 arranged circumferentially in the core component 400 can also be other numbers, such as 36, 48, and 72; at the same time, the number of slot layers of any stator slot 410 can also be other numbers, such as 4, 5, or 6. And any winding branch can also adopt other winding methods, such as wave winding, concentric winding, or a combination of multiple winding methods.

[0085] The implementation principle of the multi-branch winding structure provided in Embodiment 1 of this application is as follows:

[0086] The winding lines of the three phases are wound on the iron core 400 to form the winding body structure 300. Then, the star copper busbars 100 and phase copper busbars 200 are connected to the winding lines of the three phases respectively. A total of 3n winding lines of the three phases can form 3n spaced exit positions along the circumference of the iron core 400. Among the 3n spaced exit positions along the circumference of the iron core 400, three consecutive exit positions correspond to one of the winding branches of the three phases, and at least two exit positions correspond to different winding branches of the three phases. The exit positions of the three phases' 3n winding branches can be grouped into n groups of three consecutive exit positions. Each group of n exit positions corresponds one-to-one with n star copper busbars 100, and each star copper busbar 100 is connected to its corresponding three exit positions. The n star copper busbars 100 are also spaced along the circumference of the iron core 400.

[0087] This application connects the star-point copper busbar 100 to the output positions of different winding branches of the three phases. In a multi-branch winding structure, where the output positions of the three phases (a total of 3n winding branches) are such that every three consecutive output positions correspond to one winding branch of the three phases, and at least two winding branches are different winding branches of the three phases, the interference between the star-point copper busbars 100 in the circumferential direction is reduced, thereby reducing the bending parts of the star-point copper busbar 100. At the same time, it avoids the radial misalignment of two adjacent star-point copper busbars 100, thus simplifying the structure of the star-point copper busbar 100, improving its vibration resistance, and facilitating its stamping process.

[0088] Example 2

[0089] Embodiment 2 of this application provides a stator assembly, which includes any of the multi-branch winding structures provided in this application.

[0090] Example 3

[0091] Embodiment 3 of this application provides an electric motor, which includes any of the stator components provided in this application.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A multi-branch winding structure, characterized in that, The multi-branch winding structure is used for the stator assembly, which also includes a core (400). The multi-branch winding structure is disposed on the core (400). The multi-branch winding structure includes three phase winding lines and a star copper busbar (100). The winding line of any phase includes n parallel winding branches, where n is a positive integer not less than 2. The outgoing positions of the 3n winding branches of the three phases are arranged sequentially at intervals along the circumference of the iron core (400). Three consecutive outgoing positions along the circumference of the iron core (400) correspond to one of the winding branches of the three phases, and at least two outgoing positions correspond to different winding branches of the three phases. The number of star copper busbars (100) is n. Any star copper busbar (100) is connected to three consecutive outgoing positions along the circumference of the iron core (400), and the n star copper busbars (100) are arranged at intervals along the circumference.

2. The multi-branch winding structure according to claim 1, characterized in that, The star-shaped copper busbar (100) includes a first copper busbar component (110) and copper busbar terminals (120). There are three copper busbar terminals (120) to be connected to one of the outgoing line positions respectively. The first copper busbar component (110) connects to the three copper busbar terminals (120).

3. The multi-branch winding structure according to claim 2, characterized in that, The three-phase winding lines are wound on the iron core (400) to form a winding body structure (300). The winding body structure (300) extends out of the iron core (400) at both ends along the axial direction of the iron core (400). The star copper busbar (100) is disposed on one side of the end face of the winding body structure (300).

4. The multi-branch winding structure according to claim 3, characterized in that, The outgoing positions of the three phases and a total of 3n winding branches are set at the innermost or outermost radial side of the winding body structure (300), and the first copper busbar (110) is set at the middle position radially of the winding body structure (300).

5. The multi-branch winding structure according to claim 4, characterized in that, The multi-branch winding structure also includes phase copper busbars (200), which are set to 3 and correspond one-to-one with the three phases. The phase copper busbars (200) are connected to the input positions of the n winding branches of their corresponding phases.

6. The multi-branch winding structure according to claim 5, characterized in that, The phase copper busbar (200) includes a second copper busbar component (210) and a busbar (220). The busbar (220) is configured to have n lines. The n winding branches of the phase corresponding to the phase copper busbar (200) correspond one-to-one with the n busbars (220) of the phase copper busbar (200). One end of the busbar (220) is connected to the inlet position of the winding branch. The second copper busbar component (210) is connected to the other end of the n busbars (220) of the phase copper busbar (200).

7. The multi-branch winding structure according to claim 6, characterized in that, The busbar (220) extends at least in the middle along the circumferential direction of the winding body structure (300), and is disposed on the outer peripheral side of the end of the winding body structure (300).

8. The multi-branch winding structure according to claim 7, characterized in that, The three phases of the multi-branch winding structure are the U phase, V phase, and W phase. The core component (400) has 60 stator slots (410) arranged circumferentially. Each stator slot (410) has 8 slot layers (L1-L8) arranged radially along the core component (400), with n=4. The first winding branch of the U phase is: 1L1-13L2-2L1-14L2-3L1-15L2-4L1-16L2-5L1-17L2-5L3-17L4-4L3-16L4-3L3-15L4-2L3-14L4-1L3-13L4- 1L5-13L6-2L5-14L6-3L5-15L6-4L5-16L6-5L5-17L6-5L7-17L8-4L7-16L8-3L7-15L8-2L7-14L8-1L7-13L8; The second winding branch of phase U is: 28L8-16L7-29L8-17L7-30L8-18L7-31L8-19L7-32L8-20L7-32L6-20L5-31L6-19L5-30L6-18L5-29L6-17L5-28L6-16L5- 28L4-16L3-29L4-17L3-30L4-18L3-31L4-19L3-32L4-20L3-32L2-20L1-31L2-19L1-30L2-18L1-29L2-17L1-28L2-16L1; The third winding branch of phase U is: 31L1-43L2-32L1-44L2-33L1-45L2-34L1-46L2-35L1-47L2-35L3-47L4-34L3-46L4-33L3-45L4-32L3-44L4-31L3-43L4 -3L5-43L6-32L5-44L6-33L5-45L6-34L5-46L6-35L5-47L6-35L7-47L8-34L7-46L8-33L7-45L8-32L7-44L8-31L7-43L8; The fourth winding branch of phase U is: 58L8-46L7-59L8-47L7-60L8-48L7-61L8-49L7-62L8-50L7-62L6-50L5-61L6-49L5-60L6-48L5-59L6-47L5-58L6-46L5- 58L4-46L3-59L4-47L3-60L4-48L3-61L4-49L3-62L4-50L3-62L2-50L1-61L2-49L1-60L2-48L1-59L2-47L1-58L2-46L1; The winding lines of the V phase and the winding lines of the U phase are obtained by sequentially shifting the winding lines of the U phase by 10 and 20 of the stator slots (410), respectively.

9. A stator assembly, characterized in that, The stator assembly includes the multi-branch winding structure as described in any one of claims 1-8.

10. An electric motor, characterized in that, The motor includes the stator assembly as described in claim 9.

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