Convergence structure and preparation method thereof, stator assembly and motor

Abstract

The invention relates to a confluence structure and a preparation method thereof, a stator assembly and a motor, the confluence structure comprises three sets of confluence assemblies, each confluence assembly comprises a copper bar piece and m bus bars, and the bus bars are made of a flexible conductive material and can be flexibly wound on the end parts of winding lines of three phases in the circumferential direction; the first fixing assembly enables the three groups of confluence assemblies to be fixed into a whole, and the confluence assemblies which are fixed into a whole form a notch; and the auxiliary strip is made of a flexible conductive material, the auxiliary strip is arranged at the notch of the bus bar assembly and can be flexibly wound on the end parts of the winding circuits of the three phases along the circumferential direction, and two ends of the auxiliary strip are wound and fixed on the bus bar so as to form a complete annular structure with the bus bar assembly. The three confluence assemblies are complemented into a complete annular structure through the auxiliary strips, and the overall strength and rigidity of the confluence structure can be further improved.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic devices, and in particular to a confluence structure and a preparation method thereof, a stator assembly and a motor. Background Art

[0002] The motor includes a stator assembly, and the stator assembly includes a stator core in a hollow cylindrical shape and a stator winding wound on the stator core. For a three-phase motor, its stator winding may include winding circuits of three phases and a bus structure, wherein the winding circuit of each phase may include m parallel winding branches. The bus structure corresponds to the three phases of the three-phase motor one by one, and the bus structure and the m winding branches of the corresponding phase are welded and fixed so that the winding circuits of the three phases can constitute a three-phase circuit. In order to reduce the risk of failure of the welding point of the bus structure due to vibration, the bus structure includes a bus bar made of a flexible conductive material, which can extend along the circumference of the stator core when arranged, and can be flexibly wound on the winding circuits of the three phases. The bus structure may also include a fixing assembly for fixing a plurality of bus bars as an integral component, and the fixing assembly is usually arranged in multiple sections along the circumferential spacing of the stator core to facilitate the flexible winding of the bus structure. However, the stability of the bus structure when welded and fixed to the winding lines of the three phases of the stator winding still needs to be further improved. Summary of the invention

[0003] Based on this, the present application provides a busbar structure and a preparation method thereof, a stator assembly and a motor to improve the problem of poor stability when the busbar structure and the three-phase winding circuits are welded and fixed in the prior art.

[0004] In a first aspect, the present application provides a busbar structure, which is applicable to a stator assembly, wherein the stator assembly further comprises three-phase winding circuits, each phase winding circuit comprises m parallel winding branches, and the busbar structure comprises:

[0005] A busbar assembly, which is provided with three groups and corresponds to the three phases of the stator assembly one by one; the busbar assembly includes a copper bar and m busbars, the m busbars of the busbar assembly correspond to the m winding branches of the corresponding phases one by one, and one end of the busbar is used to be welded and fixed to the winding starting position of the corresponding winding branch to form a welding terminal, and the other end of the busbar is connected to the copper bar of the busbar assembly, the busbar is made of flexible conductive material, so that it can be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction, and the span of any busbar along the circumferential direction is less than 360 degrees;

[0006] A first fixing assembly, which connects at least two of the bus bars of the same bus assembly or different bus assemblies near the welding terminal, so that three groups of the bus assemblies are fixed as one, the span of the bus assemblies fixed as one along the circumferential direction is less than 360 degrees, and a gap is formed between two adjacent welding terminals;

[0007] The auxiliary strip is made of a flexible conductive material, which is arranged at the notch of the bus assembly and can be flexibly wound around the ends of the winding lines of the three phases along the circumferential direction. The two ends of the auxiliary strip are wound around and fixed on the bus bar to form a complete annular structure with the bus assembly, and the auxiliary strip is insulated from the bus bar.

[0008] In one embodiment, the bus bar and the auxiliary bar are both made of enameled wire.

[0009] In one of the embodiments, the bus bar is provided with an insulating sleeve at the position where the auxiliary bar is wound around and fixed on the bus bar.

[0010] In one embodiment, two ends of the auxiliary bar are spirally wound along the extension direction of the bus bar and fixed on the bus bar.

[0011] In one embodiment, the two ends of the auxiliary strip are spirally wound in opposite directions.

[0012] In one embodiment, the first fixing component includes a fixing seat and a fixing column. The fixing seat is arranged close to the copper busbar of the busbar assembly. The fixing columns are arranged in a plurality and are spaced apart on both sides of the fixing seat.

[0013] In one of the embodiments, the auxiliary strip is wrapped around and fixed on the bus bar at a position close to the two welding terminals at the notch of the bus bar component, and the bus structure also includes a second fixing component, which connects the auxiliary strip to the bus bar and at least covers the two ends of the auxiliary strip wrapped around and fixed on the bus bar.

[0014] In a second aspect, the present application provides a method for preparing a busbar structure, wherein the busbar structure is applicable to a stator assembly, wherein the stator assembly further comprises three-phase winding circuits, wherein each phase winding circuit comprises m parallel winding branches, and the method for preparing the busbar structure comprises:

[0015] Prepare a busbar assembly, wherein three groups of the busbar assembly are provided and correspond one to one with the three phases of the stator assembly; the busbar assembly comprises a copper bar and m busbars, the m busbars of the busbar assembly correspond to the m winding branches of the corresponding phases, and one end of the busbar is used to be welded and fixed to the winding starting position of the corresponding winding branch to form a welding terminal, and the other end of the busbar is connected to the copper bar of the busbar assembly, the busbar is made of a flexible conductive material so as to be flexibly wound around the ends of the winding circuits of the three phases in the circumferential direction, and the span of any of the busbars in the circumferential direction is less than 360 degrees;

[0016] At least two of the bus bars of the same bus assembly or different bus assemblies are connected at the welding terminal by a first fixing assembly, so that three groups of bus assemblies are fixed as one, the span of the bus assemblies fixed as one along the circumferential direction is less than 360 degrees, and a gap is formed between two adjacent welding terminals;

[0017] An auxiliary strip is arranged at the notch of the bus assembly. The auxiliary strip is made of flexible conductive material. The auxiliary strip can be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction. Both ends of the auxiliary strip are wound around and fixed on the bus bar to form a complete annular structure with the bus assembly. The auxiliary strip is insulated from the bus bar.

[0018] In a third aspect, the present application provides a stator assembly, which includes any one of the busbar structures provided in the present application or includes a busbar structure prepared according to any one of the preparation methods of the busbar structure provided in the present application.

[0019] In a fourth aspect, the present application provides a motor, comprising any one of the stator assemblies provided in the present application.

[0020] The present application sets the bus assembly as a copper bus bar and a bus bar made of flexible conductive material, so that the bus bar can be flexibly wound around the ends of the winding circuits of the three phases, so that the welding terminals formed when the bus bar is connected to the winding circuits of the three phases are not easy to fail due to vibration; at the same time, the present application fixes the three bus assemblies into one body by a first fixing assembly, thereby further improving the overall structural stability of the bus structure and further reducing the vibration of the welding terminals; further, the present application supplements the three bus assemblies fixed as one but with a gap into a complete annular structure by using an auxiliary bar also made of flexible conductive material, thereby further improving the overall strength and rigidity of the bus structure and thus ensuring the effectiveness of the welding terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A schematic diagram of the structure of the confluence structure provided in Example 1 of the present application;

[0022] Figure 2 A schematic diagram of the structure of a stator assembly in which the convergence structure provided in the first embodiment of the present application is applicable when the convergence structure is hidden;

[0023] Figure 3 This is a schematic diagram of the structure when the second fixing component is hidden in the bus structure provided in the first embodiment of the present application.

[0024] Figure numerals: 100, bus assembly; 110, copper busbar; 120, busbar; 121, welding terminal; 200, first fixing assembly; 210, fixing seat; 220, fixing column; 300, auxiliary bar; 400, second fixing assembly; 500, notch; 600, stator core; 610, conductor slot; 700, coil. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0027] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] Embodiment 1

[0030] Embodiment 1 of the present application provides a confluence structure, such as Figures 1 to 3As shown, the bus structure is applicable to the stator assembly, and the stator assembly also includes three-phase winding circuits, and each phase winding circuit includes m parallel winding branches. The bus structure includes:

[0031] A bus assembly 100, which is provided with three groups and corresponds to the three phases of the stator assembly one by one; the bus assembly 100 includes a copper bar 110 and m bus bars 120, the m bus bars 120 of the bus assembly 100 correspond to the m winding branches of the corresponding phases one by one, and one end of the bus bar 120 is used to be welded and fixed to the winding starting position of the corresponding winding branch to form a welding terminal 121, and the other end of the bus bar 120 is connected to the copper bar 110 of the bus assembly 100, and the bus bar 120 is made of a flexible conductive material so that it can be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction, and the span of any bus bar 120 along the circumferential direction is less than 360 degrees;

[0032] A first fixing assembly 200, which connects at least two busbars 120 of the same busbar assembly 100 or different busbar assemblies 100 near the welding terminal 121, so that the three sets of busbar assemblies 100 are fixed as one, and the span of the busbar assemblies 100 fixed as one along the circumferential direction is less than 360 degrees, and a gap 500 is formed between two adjacent welding terminals 121;

[0033] The auxiliary bar 300 is made of a flexible conductive material. The auxiliary bar 300 is arranged at the notch 500 of the bus assembly 100 and can be flexibly wound around the ends of the winding lines of the three phases along the circumferential direction. Both ends of the auxiliary bar 300 are wound around and fixed on the bus bar 120 to form a complete annular structure with the bus assembly 100. The auxiliary bar 300 is insulated from the bus bar 120.

[0034] like Figure 1 and Figure 2As shown, in this embodiment, it is exemplarily explained that the stator assembly may include a stator winding and a stator core 600, wherein the stator core 600 may be formed by stacking a number of punching sheets, which may be set as a hollow cylindrical structure. The inner side of the stator core 600 may be provided with a number of conductor slots 610 at equal intervals along the circumferential direction, and the conductor slots 610 may be used to arrange the coils 700. The stator assembly in this embodiment is suitable for a three-phase motor, so the stator winding includes three-phase winding circuits. For the winding circuit of each phase, it includes m winding branches, where m≥2; each winding branch can be wound by a number of the aforementioned coils 700 in a specific winding manner, such as winding methods such as stacking, wave winding or concentric winding, which are not limited here. After the winding circuits of the three phases of the stator assembly are wound, the winding circuits of the three phases are in the shape of a rotating body coaxially arranged with the stator core 600, and its two ends are arranged outside the end of the stator core 600. The busbar assembly 100 can be arranged at one end of the winding circuit of the three phases, and is used to connect m winding branches of the same phase in parallel to form the required three-phase circuit. Based on this, the busbar assembly 100 is arranged in three groups to correspond to the three phases of the stator assembly one by one.

[0035] The bus assembly 100 may include a copper bar 110 and a bus bar 120, wherein the bus bar 120 is arranged to be m, and the m bus bars 120 of the bus assembly 100 correspond one to one to the m winding branches of the corresponding phase; this embodiment is described by taking m=4 as an example. When the bus assembly 100 is connected to the winding circuits of the three phases of the stator assembly, one end of the bus bar 120 is welded and fixed to the winding starting position of the corresponding winding branch, and a welding terminal 121 is formed. It is not difficult to see that the winding starting position of the winding branch is the end of the aforementioned coil 700; and the welding terminal 121 is the welding point formed when the end of the bus bar is connected to the end of the aforementioned coil 700. When the motor is working, the welding point is easily invalidated due to vibration.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the busbar 120 can be made of a flexible wire material, such as a round copper wire, which has the characteristic of being elastically stretchable, so that the busbar 120 can be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction, thereby reducing the vibration of the busbar 120 assembly. At the same time, when the busbar 120 is welded to the winding starting position of the corresponding winding branch, it is also convenient to bend the end toward the direction close to the welding point, which is more convenient. After the end of the busbar 120 is bent, it can be arranged in the axial section of the stator core 600, and the axial section of the stator core 600 is the longitudinal section passing through the axis of the stator core 600.

[0037] like Figure 1As shown, the other end of the busbar 120 is fixed on the copper bar 110 of its bus assembly 100; based on this, the ends of m busbars 120 are fixed on the same copper bar 110, and the lengths of the m busbars 120 are different due to the different winding starting positions of the m winding branches of the same phase. However, it should be noted that the two ends of any busbar 120 must be arranged at intervals along the circumferential direction, so the span of any busbar 120 along the circumferential direction must also be less than 360 degrees. The copper bar 110 can be specifically set as a long strip, and the busbar 120 can be fixed on one end thereof; the busbar 120 can be fixed on the copper bar 110 by welding, clamping or bonding. The extension direction of the three copper bar 110 can be reasonably set according to actual needs; but generally speaking, in order to facilitate three-phase wiring, the three copper bar 110 are at least circumferentially adjacent to one end away from the busbar 120, and are arranged in the same reference plane.

[0038] like Figure 1 As shown, in this embodiment, the bus structure also includes a first fixing component 200, which can be an injection molded part, which is arranged at least close to the welding terminal 121 and is used to connect at least two bus bars 120. The at least two bus bars 120 can belong to the same bus assembly 100, or they can belong to different bus assemblies 100. However, it should be noted that the bus bars 120 belonging to different bus assemblies 100 should be arranged at intervals along the axial direction of the stator core 600 to avoid short circuits. When the bus bar 120 is flexibly wound on the ends of the winding circuits of the three phases, it abuts against the ends of the winding circuits of the three phases through the first fixing component 200 to avoid direct contact with the winding circuits of the three phases at other positions to cause short circuits. And through the connection effect of the first fixing component 200, the three groups of bus assemblies 100 can be fixed as one, that is, to form an integral component. The integrated component can make the bus structure have a relatively high structural stability. When the motor is working, the welding terminal 121 is less likely to fail due to vibration. At the same time, the bus bars 120 belonging to different bus assemblies 100 are also less likely to contact each other due to vibration.

[0039] like Figure 1 and Figure 3As shown, in this embodiment, it is also necessary to emphasize that, for any phase of the stator assembly, the winding starting positions of its m winding branches are arranged at intervals along the circumference of the stator core 600; the span of the corresponding bus assembly 100 is the span between the two winding starting positions that are farthest apart along the circumferential direction. For the three phases of the stator assembly, there are usually overlapping parts between the three bus assemblies 100, so that the three bus assemblies 100 cannot be connected end to end along the circumferential direction to form a complete annular structure. That is, the span of the three bus assemblies 100 fixed as a whole by the first fixing assembly 200 is also less than 360 degrees. At this time, the three bus assemblies 100 are formed with a gap 500 along the circumferential direction, and the gap 500 is located between two adjacent welding terminals 121.

[0040] like Figure 1 and Figure 3 As shown, based on this, the present embodiment also fills the aforementioned gap 500 with an auxiliary bar 300. The auxiliary bar 300 is also made of a flexible conductive material, and is preferably made of the same material and size as the bus bar 120, so as to make full use of the existing raw materials for preparation and processing, and can achieve the purpose of convenience, speed and cost saving. The auxiliary bar 300 is arranged at the aforementioned gap 500; similarly, the auxiliary bar 300 can also be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction. When the auxiliary bar 300 is arranged, its two ends are wound around and fixed on the bus bar 120. Since the auxiliary bar 300 is conductive, it should also be insulated from the bus bar 120 to avoid short circuit. By filling the auxiliary bar 300, the bus assembly 100 can form a complete annular structure. It is not difficult to see that in addition to the presence of solder joints between the annular structure and the winding circuits of the three phases, the annular structure is also abutted against the ends of the winding circuits of the three phases through the first fixing component 200. By controlling the length of the auxiliary bar 300, the annular structure can also utilize the elasticity of the bus bar 120 and the auxiliary bar 300 and have an interference fit with the ends of the three-phase winding circuits through the first fixing assembly 200, that is, the annular structure can be clamped on the ends of the three-phase winding circuits. By setting the bus bar 120 and the auxiliary bar 300 to be the same material, the annular structure can have a larger elastic stretch range.

[0041] It can be understood that the present application, by configuring the bus assembly 100 as a copper bus bar 110 and a bus bar 120 made of a flexible conductive material, can flexibly wrap the bus bar 120 around the ends of the winding circuits of the three phases, so that the welding terminal 121 formed when the bus bar 120 is connected to the winding circuits of the three phases is not easy to fail due to vibration; at the same time, the present application, by fixing the three bus assemblies 100 as a whole by the first fixing assembly 200, can further improve the overall structural stability of the bus structure, so as to further reduce the vibration of the welding terminal 121; furthermore, the present application, by using an auxiliary bar 300 also made of a flexible conductive material to supplement the three bus assemblies 100 fixed as a whole but with a gap 500 into a complete annular structure, can further improve the overall strength and rigidity of the bus structure, thereby ensuring the effectiveness of the welding terminal 121.

[0042] Specifically, the bus bar 120 and the auxiliary bar 300 are both made of enameled wire.

[0043] like Figure 1 and Figure 3 As shown, in this embodiment, the enameled wire includes a conductor and an insulating layer, wherein the conductor is made of a flexible conductive material, and the insulating layer can be prepared on the conductor by painting, baking and other processes. It is not difficult to see that the busbars 120 made of enameled wire are not easy to conduct electricity, thereby reducing the occurrence of short circuits. The auxiliary bar 300 made of enameled wire is also not easy to conduct electricity with the busbar 120, which can meet the requirements of the insulation setting between the auxiliary bar 300 and the busbar 120.

[0044] More specifically, the bus bar 120 is provided with an insulating sleeve at a position where the auxiliary bar 300 is wound around and fixed to the bus bar 120 .

[0045] like Figure 1 and Figure 3 As shown, Figure 1 and Figure 3 As shown, in this embodiment, the insulating sleeve can be made of plastic, rubber, silicone and other materials, and can be set as a circular sleeve with a slit on the side, so that the insulating sleeve can be set on the bus bar 120 through the slit. The auxiliary bar 300 is wound and fixed at the position where the insulating sleeve is located. When the auxiliary bar 300 is wound and fixed on the bus bar 120, the insulating sleeve is also locked and fixed, so that the insulating sleeve is not easy to move or expand.

[0046] It can be understood that, in this embodiment, an insulating sleeve is provided at the position where the auxiliary bar 300 is wrapped and fixed on the bus bar 120, so as to further improve the insulation effect between the auxiliary bar 300 and the bus bar 120; in the embodiment where both the auxiliary bar 300 and the bus bar 120 are made of enameled wire, even if the friction between the auxiliary bar 300 and the bus bar 120 is generated due to vibration, so that the insulation layer of the enameled wire of the auxiliary bar 300 and the bus bar 120 is damaged or falls off, there will be no short circuit between the auxiliary bar 300 and the bus bar 120.

[0047] Specifically, both ends of the auxiliary bar 300 are spirally wound along the extending direction of the bus bar 120 and fixed on the bus bar 120 .

[0048] like Figure 1 and Figure 3 As shown, in this embodiment, the two ends of the auxiliary bar 300 can be wound and fixed on the portion of the bus bar 120 extending along the circumferential direction of the stator core 600; and when the two ends of the auxiliary bar 300 are wound, they can be spirally extended based on the extension direction of the bus bar 120, that is, the axial direction of the bus bar 120. In this embodiment, the end of the bus bar 120 is spirally wound for 4 turns as an example to ensure the stability of the end of the auxiliary bar 300 when connected to the bus bar 120.

[0049] It is understandable that in this embodiment, by spirally winding the two ends of the auxiliary bar 300 and fixing them on the bus bar 120, the auxiliary bar 300 can be firmly connected to the bus bar 120 while reducing the difficulty of manufacturing and processing and ensuring the efficiency of manufacturing and processing.

[0050] More specifically, the two ends of the auxiliary strip 300 are spirally wound in opposite directions.

[0051] like Figure 1 and Figure 3 As shown, in this embodiment, illustratively, when the two ends of the auxiliary strip 300 are spirally wound, the directions of the spiral winding are set in opposite directions, that is, under the same reference, if one end of the auxiliary strip 300 adopts a right-handed spiral winding method, the other end of the auxiliary strip 300 adopts a left-handed spiral winding method.

[0052] It is understandable that in this embodiment, the two ends of the auxiliary bar 300 are spirally wound in opposite directions, which can further improve the stability of the connection between the auxiliary bar 300 and the bus bar 120 .

[0053] Specifically, the first fixing assembly 200 includes a fixing seat 210 and a fixing column 220 . The fixing seat 210 is arranged close to the copper busbar 110 of the bus assembly 100 . A plurality of fixing columns 220 are arranged at intervals on both sides of the fixing seat 210 .

[0054] like Figure 1 and Figure 3 As shown, in this embodiment, it is exemplarily explained that it is not difficult to understand that the number of busbars 120 is relatively large at the copper bar 110 close to the bus assembly 100; and the number of busbars 120 is relatively small at the position of the copper bar 110 far away from the bus assembly 100. Based on this, a fixing seat 210 with a relatively large circumferential span can be used to connect several busbars 120 of the copper bar 110 close to the bus assembly 100. The fixing seat 210 can be set to an integral arc shape, and the parts of several busbars 120 corresponding to the location of the fixing seat 210 are all injection molded in the fixing seat 210, so that the busbars 120 of different bus assemblies 100 are not easy to contact each other due to vibration. At the same time, a fixing column 220 with a relatively small circumferential span can be used to connect several busbars 120 of the copper bar 110 far away from the bus assembly 100. The fixing column 220 can be set as a block-shaped column, which can only connect a plurality of bus bars 120 at a position close to the welding terminal 121. The fixing column 220 can be set at intervals to a plurality of positions according to the actual distribution of the winding starting positions of the winding branches; and due to the centralized arrangement of the copper bar 110 of the three bus assemblies 100, a plurality of fixing columns 220 are usually arranged on both sides between the fixing seats 210.

[0055] It can be understood that this embodiment, by configuring the first fixing component 200 as a fixing base 210 and a plurality of fixing columns 220 spaced apart on both sides of the fixing base 210, can effectively connect and fix the three bus components 100 as a whole while ensuring the flexible winding function of the bus bar 120, that is, the bus bar 120 can be flexibly wound on the ends of the stator windings of the three phases.

[0056] Specifically, the auxiliary bar 300 is wrapped around and fixed on the bus bar 120 at two welding terminals 121 close to the notch 500 of the bus assembly 100. The bus structure also includes a second fixing assembly 400, which connects the auxiliary bar 300 to the bus bar 120 and at least covers the two ends of the auxiliary bar 300 that are wrapped around and fixed on the bus bar 120.

[0057] like Figure 1 and Figure 3As shown, in this embodiment, it is exemplarily explained that when the auxiliary bar 300 is wrapped and fixed on the bus bar 120, the position where it is wrapped and fixed is close to the two welding terminals 121 at the notch 500 of the three bus assemblies 100 fixed as one, that is, the position where the auxiliary bar 300 is wrapped around the bend of the bus bar 120. After the auxiliary bar 300 is wrapped and fixed on the bus bar 120, it can also be reinforced by the second fixing assembly 400. The second fixing assembly 400 can also be formed by injection molding, and it at least covers the two ends of the auxiliary bar 300 wrapped and fixed on the bus bar 120; in this embodiment, the second fixing assembly 400 can include two injection molding structures similar to the aforementioned fixing column 220.

[0058] It can be understood that in this embodiment, the auxiliary bar 300 is further connected to the bus bar 120 through the second fixing component 400, and the second fixing component 400 is at least covered outside the two ends of the auxiliary bar 300 wrapped around and fixed on the bus bar 120, so that the part of the auxiliary bar 300 wrapped around and fixed on the bus bar 120 is not easy to loosen, thereby further improving the structural stability of the complete annular structure formed by the auxiliary bar 300 and the three bus components 100.

[0059] Embodiment 2

[0060] Embodiment 2 of the present application provides a method for preparing a busbar structure. The busbar structure is applicable to a stator assembly. The stator assembly further includes three-phase winding circuits. Each phase winding circuit includes m parallel winding branches. The method for preparing the busbar structure includes the following steps:

[0061] S1. Prepare a bus assembly 100, wherein the bus assembly 100 is provided with three groups, and corresponds to the three phases of the stator assembly one by one; the bus assembly 100 includes a copper bus bar 110 and m bus bars 120, wherein the m bus bars 120 of the bus assembly 100 correspond to the m winding branches of the corresponding phases, and one end of the bus bar 120 is used for welding and fixing to the winding starting position of the corresponding winding branch to form a welding terminal 121, and the other end of the bus bar 120 is connected to the copper bus bar 110 of the bus assembly 100, and the bus bar 120 is made of a flexible conductive material so as to be flexibly wound around the ends of the winding circuits of the three phases in the circumferential direction, and the circumferential span of any bus bar 120 is less than 360 degrees;

[0062] S2. At least two busbars 120 of the same busbar assembly 100 or different busbar assemblies 100 are connected at the welding terminal 121 by the first fixing assembly 200, so that the three sets of busbar assemblies 100 are fixed as one, and the span of the busbar assemblies 100 fixed as one along the circumferential direction is less than 360 degrees, and a gap 500 is formed between two adjacent welding terminals 121;

[0063] S3. An auxiliary strip 300 is arranged at the notch 500 of the bus assembly 100. The auxiliary strip 300 is made of a flexible conductive material. The auxiliary strip 300 can be flexibly wound around the ends of the winding circuits of the three phases along the circumferential direction. Both ends of the auxiliary strip 300 are wound around and fixed on the bus bar 120 to form a complete annular structure with the bus assembly 100. The auxiliary strip 300 is insulated from the bus bar 120.

[0064] The present application sets the busbar 120 as a copper busbar 110 and a busbar 120 made of a flexible conductive material, so that the busbar 120 can be flexibly wound around the ends of the winding circuits of the three phases, so that the welding terminal 121 formed when the busbar 120 is connected to the winding circuits of the three phases is not easy to fail due to vibration; at the same time, the present application fixes the three busbar assemblies 100 as a whole by the first fixing assembly 200, so as to further improve the overall structural stability of the busbar structure and further reduce the vibration of the welding terminal 121; furthermore, the present application supplements the three busbar assemblies 100 fixed as a whole but with a gap 500 into a complete annular structure by using an auxiliary bar 300 also made of a flexible conductive material, so as to further improve the overall strength and rigidity of the busbar structure, thereby ensuring the effectiveness of the welding terminal 121.

[0065] Embodiment 3

[0066] Embodiment 3 of the present application discloses a stator assembly, which includes any one of the busbar structures provided in the present application or includes a busbar structure prepared according to any one of the preparation methods of the busbar structure provided in the present application.

[0067] Embodiment 4

[0068] Embodiment 4 of the present application discloses a motor, characterized in that the motor comprises any one of the stator assemblies provided in the present application.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0070] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A confluence structure, characterized in that: The bus structure is applicable to a stator assembly, and the stator assembly further comprises three-phase winding circuits, each phase winding circuit comprises m parallel winding branches, and the bus structure comprises: A busbar assembly (100), which is provided with three groups and corresponds one-to-one to the three phases of the stator assembly; the busbar assembly (100) comprises a copper bar (110) and m busbars (120); the m busbars (120) of the busbar assembly (100) correspond one-to-one to the m winding branches of the corresponding phases; one end of the busbar (120) is used to be welded and fixed to the winding starting position of the corresponding winding branch to form a welding terminal (121); the other end of the busbar (120) is connected to the copper bar (110) of the busbar assembly (100); the busbar (120) is made of a flexible conductive material so as to be flexibly wound around the ends of the winding circuits of the three phases in the circumferential direction; the span of any busbar (120) in the circumferential direction is less than 360 degrees; A first fixing assembly (200) is used to connect at least two bus bars (120) of the same bus assembly (100) or different bus assemblies (100) near the welding terminal (121), so that three groups of bus assemblies (100) are fixed as a whole, the span of the bus assemblies (100) fixed as a whole along the circumferential direction is less than 360 degrees, and a gap (500) is formed between two adjacent welding terminals (121); An auxiliary bar (300) is made of a flexible conductive material. The auxiliary bar (300) is arranged at a notch (500) of the busbar assembly (100) and can be flexibly wound around the ends of the winding lines of the three phases in a circumferential direction. Both ends of the auxiliary bar (300) are wound around and fixed on the busbar (120) to form a complete annular structure with the busbar assembly (100). The auxiliary bar (300) is insulated from the busbar (120).

2. The confluence structure according to claim 1, characterized in that: The bus bar (120) and the auxiliary bar (300) are both made of enameled wire.

3. The confluence structure according to claim 1 or 2, characterized in that: The bus bar (120) is provided with an insulating sleeve at a position where the auxiliary bar (300) is wound around and fixed on the bus bar (120).

4. The confluence structure according to claim 1, characterized in that: Two ends of the auxiliary bar (300) are spirally wound along the extension direction of the bus bar (120) and fixed on the bus bar (120).

5. The confluence structure according to claim 4, characterized in that: The two ends of the auxiliary strip (300) are spirally wound in opposite directions.

6. The confluence structure according to claim 1, characterized in that: The first fixing assembly (200) comprises a fixing seat (210) and a fixing column (220), wherein the fixing seat (210) is arranged close to the copper bar (110) of the busbar assembly (100), and the fixing column (220) is arranged in a plurality, and the plurality of fixing columns (220) are arranged at intervals on both sides of the fixing seat (210).

7. The confluence structure according to claim 1, characterized in that: The auxiliary bar (300) is wound around and fixed on the bus bar (120) at two welding terminals (121) located near the notch (500) of the bus assembly (100), and the bus structure further includes a second fixing assembly (400), which connects the auxiliary bar (300) to the bus bar (120) and at least covers the two ends of the auxiliary bar (300) that are wound around and fixed on the bus bar (120).

8. A method for preparing a confluence structure, characterized in that: The bus structure is suitable for a stator assembly, the stator assembly further includes three-phase winding circuits, each phase winding circuit includes m parallel winding branches, and the preparation method of the bus structure includes: A busbar assembly (100) is prepared, wherein the busbar assembly (100) is provided with three groups, and corresponds to the three phases of the stator assembly one by one; the busbar assembly (100) comprises a copper bar (110) and m busbars (120); the m busbars (120) of the busbar assembly (100) correspond to the m winding branches of the corresponding phases, and one end of the busbar (120) is used to be welded and fixed to the winding starting position of the corresponding winding branch to form a welding terminal (121); the other end of the busbar (120) is connected to the copper bar (110) of the busbar assembly (100); the busbar (120) is made of a flexible conductive material so as to be flexibly wound around the ends of the winding circuits of the three phases in the circumferential direction; and the span of any busbar (120) in the circumferential direction is less than 360 degrees; At least two bus bars (120) of the same bus assembly (100) or different bus assemblies (100) are connected at the welding terminal (121) by a first fixing assembly (200), so that three groups of bus assemblies (100) are fixed as a whole, the span of the bus assemblies (100) fixed as a whole along the circumferential direction is less than 360 degrees, and a gap (500) is formed between two adjacent welding terminals (121); An auxiliary bar (300) is arranged at the notch (500) of the bus assembly (100); the auxiliary bar (300) is made of a flexible conductive material; the auxiliary bar (300) can be flexibly wound around the ends of the winding lines of the three phases along the circumferential direction; both ends of the auxiliary bar (300) are wound around and fixed on the bus bar (120) to form a complete annular structure with the bus assembly (100); the auxiliary bar (300) is insulated from the bus bar (120).

9. A stator assembly, characterized in that: The stator assembly includes the busbar structure as described in any one of claims 1 to 7 or includes a busbar structure prepared according to the method for preparing a busbar structure as described in claim 8.

10. A motor, characterized in that: The electric machine comprises the stator assembly according to claim 9.

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