Stator for an electric machine and electric machine comprising same

Abstract

A stator for an electric motor includes a hole formed at a center of the stator by arranging a plurality of assemblies in a circumferential direction (C) of the stator. Each of the plurality of assemblies includes a stator core, a winding bobbin, a coil, and a plurality of bus bars provided on the winding bobbin. The plurality of bus bars includes first to third bus bars. In the plurality of assemblies, both ends of the first bus bar in the circumferential direction (C) and both ends of the second bus bar in the circumferential direction (C) are separated from each other in the circumferential direction (C) while being separated from each other in a radial direction (R) or an axial direction (A) of the stator.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2021-0030634, filed on March 9, 2021, which is incorporated herein by reference for all purposes, as set forth herein. Technical Field

[0003] An exemplary embodiment relates to a stator for an electric motor and an electric motor including a stator. Background Technology

[0004] In order to overcome the environmental pollution caused by existing internal combustion engine vehicles and the unstable supply and demand of fuel at home and abroad, hybrid vehicles, electric vehicles, etc. have been actively developed and produced.

[0005] Both electric and hybrid vehicles are equipped with drive motors to propel the vehicle. These motors have a structure in which coils are wound around a stator core. An injection-molded assembly made of plastic, called a spool, is used in the motor to prevent the coils from being damaged by the stator core. According to related technology, the motor has a structure where a stator core and a spool are assembled, with the coils wound around the spool.

[0006] Here, the motor has a structure in which multiple components, including a stator core, a winding spool, and coils, are joined together. Specifically, in order for the multiple components constituting the drive motor of the automobile to receive power from the power supply unit, the multiple components and the power supply unit are electrically connected to each other via terminals.

[0007] However, according to relevant technologies, the weight and production cost of automotive drive motors increase due to the volume occupied by these terminals. Furthermore, it is difficult to utilize the space around the terminals, and the structure of the drive motor becomes more complex.

[0008] Furthermore, according to relevant technologies, there are many areas in the motor that need to be welded, thus complicating the manufacturing process. Additionally, the gaps between the welded areas are not adequately ensured, leading to a deterioration in insulation safety. Summary of the Invention

[0009] An exemplary embodiment of the present invention is used to eliminate existing terminals, thereby reducing the weight and production cost of the drive motor of an automobile, increasing the space utilization around the motor, and simplifying the structure of the motor.

[0010] An exemplary embodiment of the present invention is further used to: simplify the welding process required in the manufacture of an electric motor compared with related technologies; and improve insulation safety by ensuring sufficient gaps between the areas to be welded.

[0011] A first exemplary embodiment of the present invention provides a stator for an electric motor, the stator having a hole formed at a center of the stator by arranging a plurality of components in a circumferential direction (C), wherein each of the plurality of components includes: a stator core; a winding shaft provided to surround an outer surface of the stator core; a coil wound around the winding shaft a plurality of times and having lead-in and lead-out wires provided at each end of the coil; and a plurality of bus bars provided on the winding shaft, wherein the plurality of bus bars includes a first bus bar, a second bus bar, and a third bus bar, and wherein, among the plurality of components, both ends of the first bus bar in the circumferential direction (C) and both ends of the second bus bar in the circumferential direction (C) are separated from each other in the circumferential direction (C) while being separated from each other in a radial direction (R) or an axial direction (A) of the stator.

[0012] Among the plurality of components, both ends of the second bus bar in the circumferential direction (C) and both ends of the third bus bar in the circumferential direction (C) can be separated from each other in the circumferential direction (C) while being separated from each other in the radial direction (R) or the axial direction (A).

[0013] The first bus bar can cross the second bus bar and the third bus bar.

[0014] The third bus bar can be provided more outward in the radial direction (R) than the second bus bar, wherein, among the plurality of components, the second bus bar is provided to be offset in a first circumferential direction (C1) of two directions of the circumferential direction (C) with respect to the stator core and the winding shaft, and the third bus bar is provided to be offset in a second circumferential direction (C2) of the two directions of the circumferential direction (C) with respect to the stator core and the winding shaft.

[0015] The third bus bar can be provided upward from the second bus bar in the axial direction (A), wherein, among the plurality of components, the second bus bar is provided to be offset in a first circumferential direction (C1) of two directions of the circumferential direction (C) with respect to the stator core and the winding shaft, and the third bus bar is provided to be offset in a second circumferential direction (C2) of the two directions of the circumferential direction (C) with respect to the stator core and the winding shaft.

[0016] The plurality of components can have sufficient similarity to be compatible with each other.

[0017] A bent portion bent in the axial direction (A) of the stator can be provided at each of both ends of the first bus bar to the third bus bar in the circumferential direction (C).

[0018] A bent portion bent outward in the radial direction (R) can be provided at each of both ends of the first bus bar to the third bus bar in the circumferential direction (C).

[0019] The plurality of components can be divided into one or more first components, one or more second components, and one or more third components, and each of the first components, each of the second components, and each of the third components can be alternately arranged in the circumferential direction (C). One of the curved portions provided in the first bus bars of the first components can be joined to one of the curved portions provided in the third bus bars of the second components to form a joint region, and the other of the curved portions provided in the first bus bars of the first components can be joined to the other of the curved portions provided in the second bus bars of the third components to form a joint region. One of the curved portions provided in the second bus bars of the first components can be joined to one of the curved portions provided in the first bus bars of the second components to form a joint region, and the other of the curved portions provided in the second bus bars of the first components can be joined to one of the curved portions provided in the third bus bars of the third components to form a joint region. One of the curved portions provided in the third bus bars of the first components can be joined to one of the curved portions provided in the second bus bars of the second components to form a joint region, and the other of the curved portions provided in the third bus bars of the first components can be joined to one of the curved portions provided in the first bus bars of the third components to form a joint region.

[0020] The curved portions provided at both ends of the first bus bars provided in the first components can be respectively disposed within the widths of the second components and the third components in the circumferential direction (C), in which the third components are adjacent to the first components in the circumferential direction (C).

[0021] One of the curved portions provided at both ends of the second bus bars provided in the first components can be disposed within the width of the first components in the circumferential direction (C), and the other of the curved portions can be disposed in a region between the first components and the third components adjacent to the first components in the circumferential direction (C).

[0022] One of the curved portions provided at both ends of the third bus bars provided in the first components can be disposed within the width of the first components in the circumferential direction (C), and the other of the curved portions can be disposed in a region between the first components and the second components adjacent to the first components in the circumferential direction (C).

[0023] One of the curved portions provided in the first bus bar of the second assembly can be joined to one of the curved portions provided in the third bus bar of the third assembly to form a joining region. One of the curved portions provided in the second bus bar of the second assembly can be joined to one of the curved portions provided in the first bus bar of the third assembly to form a joining region. One of the curved portions provided in the third bus bar of the second assembly can be joined to one of the curved portions provided in the second bus bar of the third assembly to form a joining region.

[0024] A portion of the winding shaft can be provided between two adjacent joining regions among the plurality of joining regions.

[0025] The stator can receive power from a power supply unit configured to supply three-phase power of U-phase power, V-phase power, and W-phase power, wherein the first assembly receives the U-phase power from the power supply unit through the lead-in wire of the first assembly, the second assembly receives the V-phase power from the power supply unit through the lead-in wire of the second assembly, and the third assembly receives the W-phase power from the power supply unit through the lead-in wire of the third assembly.

[0026] The plurality of bus bars can further include a fourth bus bar, and a curved portion curved in the axial direction (A) or the radial direction (R) can be provided at each of both ends of the fourth bus bar in the circumferential direction (C), wherein the curved portion provided in the fourth bus bar is joined to another curved portion provided in an adjacent fourth bus bar to form a joining region.

[0027] The first bus bar to the third bus bar can be provided outside the winding shaft in the radial direction (R), and the fourth bus bar can be provided inside the winding shaft in the radial direction (R).

[0028] The first bus bar to the third bus bar can be provided in an upper region of the winding shaft in the axial direction (A), and the fourth bus bar can be provided in a lower region of the winding shaft in the axial direction (A).

[0029] The lead-in wire can be joined to a joining region formed by the curved portion of the first bus bar and the curved portion of the third bus bar, or to a joining region formed by the curved portion of the first bus bar and the curved portion of the second bus bar, and the lead-out wire can be joined to a joining region formed by the curved portion of the fourth bus bar.

[0030] A second exemplary embodiment of the present application provides an electric motor including: a stator; and a rotor, wherein the stator has a structure having a hole formed at a center of the stator by arranging a plurality of components in a circumferential direction (C), the rotor being disposed in the hole, wherein each of the plurality of components includes: a stator core; a winding shaft disposed around an outer surface of the stator core; a coil wound around the winding shaft a plurality of times and having lead-in and lead-out wires disposed at each end of the coil; and a plurality of bus bars disposed on the winding shaft, wherein the plurality of bus bars include a first bus bar, a second bus bar, and a third bus bar, wherein, among the plurality of components, both ends of the first bus bar in the circumferential direction (C) and both ends of the second bus bar in the circumferential direction (C) are spaced apart from each other in the circumferential direction (C) while being spaced apart from each other in a radial direction (R) or an axial direction (A) of the stator. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

[0032] Figure 1 FIG. 1 is a perspective view showing a structure of a stator for an electric motor according to an exemplary embodiment of the present disclosure.

[0033] Figure 2 FIG. 2 is an enlarged perspective view showing a component constituting a stator for an electric motor according to an exemplary embodiment of the present disclosure.

[0034] Figure 3 FIG. 3 is an enlarged plan view showing a component constituting a stator for an electric motor according to an exemplary embodiment of the present disclosure.

[0035] Figure 4 FIG. 4 is an enlarged view showing a vicinity of a joint region in a stator for an electric motor according to an exemplary embodiment of the present disclosure.

[0036] Figure 5 FIG. 5 is a perspective view showing a structure of a stator for an electric motor according to another exemplary embodiment of the present disclosure.

[0037] Figure 6 FIG. 6 is an enlarged side view showing a component constituting a stator for an electric motor according to another exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, a stator for an electric motor and an electric motor according to the present disclosure will be described with reference to the accompanying drawings.

[0039] Stator for an electric machine

[0040] Figure 1is a perspective view showing a structure of a stator for an electric motor according to an exemplary embodiment of the present disclosure, Figure 2 is an enlarged perspective view showing an assembly constituting a stator for an electric motor according to an exemplary embodiment of the present disclosure. Figure 3 is an enlarged plan view showing an assembly constituting a stator for an electric motor according to an exemplary embodiment of the present disclosure, Figure 4 is an enlarged view showing a vicinity of a joint region in a stator for an electric motor according to an exemplary embodiment of the present disclosure.

[0041] Referring to Figure 1 , a stator for an electric motor according to the present disclosure (hereinafter, referred to as "stator 10") can have a structure having a hole formed at the center of the stator by arranging a plurality of assemblies 20 in a circumferential direction C of the stator 10. As described later, a rotor can be provided in the hole. Figure 1 It is shown that the plurality of assemblies 20 are arranged in an approximate circular shape to form a circular hole. However, unlike the above-described configuration, the plurality of assemblies can be arranged along a closed curve having various shapes, and the hole can also have a shape corresponding thereto.

[0042] Further, as shown in Figure 2 and Figure 3 , each assembly 20 constituting the stator 10 can include a stator core 100, a coil 200, and a winding shaft 300. The winding shaft 300 can be provided to surround the outer surface of the stator core 100. This can be understood as the stator core 100 having a structure inserted into an empty space formed in the winding shaft 300.

[0043] Meanwhile, the coil 200 can be configured to be wound around the outer surface of the winding shaft 300 multiple times, and lead-in wires 210 and lead-out wires 220 can be provided at each end of the coil 200 in the longitudinal direction. The lead-in wires 210 and the lead-out wires 220 can protrude outward.

[0044] According to the present disclosure, when current flows through the coil 200, a magnetic field is formed around the coil 200. Therefore, an induced electromotive force is generated in a rotor provided in the electric motor by a change in the magnetic field, and the rotor starts to rotate. The driving principle of the electric motor is a well-known technical feature, and thus the description thereof will be omitted.

[0045] Meanwhile, the stator 10 according to the present disclosure can further include a plurality of bus bars 400 disposed in the coil bobbin 300. The bus bars 400 can provide a path through which the assembly 20 constituting the stator 10 receives power from the power supply unit. To this end, one of the plurality of bus bars 400 disposed in each assembly 20 can be connected to the lead-in wire 210. Further, another of the plurality of bus bars 400 disposed in each assembly 20 can be connected to the lead-out wire 220. More preferably, the lead-in wire 210 can be joined to one of the plurality of bus bars 400, and the lead-out wire 220 can be joined to another of the plurality of bus bars 400. The joining can be performed, for example, by welding.

[0046] Meanwhile, the plurality of assemblies 20 constituting the stator 10 according to the present disclosure can have the same structure. Here, the feature that the plurality of assemblies 20 have the same structure can be understood as the plurality of assemblies being very similar to each other such that, when a person of ordinary skill in the art to which the present disclosure pertains simply checks the relative positions of the stator core, coil, coil bobbin, and bus bar constituting the plurality of assemblies, the plurality of assemblies can be considered as compatible assemblies.

[0047] However, according to the present disclosure, the plurality of assemblies 20 constituting the stator 10 can be divided into a plurality of groups. For example, referring to Figure 3 , the plurality of assemblies 20 can be divided into one or more first assemblies 20a, one or more second assemblies 20b, and one or more third assemblies 20c. However, this is not intended to mean that the structures of the first assembly to the third assembly are different from each other. Rather, according to a preferred example of the present disclosure, the first assembly to the third assembly 20a, 20b, and 20c can have the same structure. As will be described later, the assemblies can be divided into the first assembly to the third assembly 20a, 20b, and 20c according to the type of power that the assemblies receive from the power supply unit.

[0048] Meanwhile, as Figures 1 to 3 indicated in the above-described drawings, the stator 10 can have a structure in which each of the first assemblies 20a, each of the second assemblies 20b, and each of the third assemblies 20c are alternately arranged in the circumferential direction C.

[0049] For example, the second assembly 20b and the third assembly 20c can be disposed on one side of the first assembly 20a and the other side of the first assembly 20a opposite to the one side in the circumferential direction C, respectively. The first assembly 20a and the third assembly 20c can be disposed on one side of the second assembly 20b and the other side of the second assembly 20b opposite to the one side in the circumferential direction C, respectively. The first assembly 20a and the second assembly 20b can be disposed on one side of the third assembly 20c and the other side of the third assembly 20c opposite to the one side in the circumferential direction C, respectively. Accordingly, the number of the first assembly to the third assembly disposed in the stator 10 can be the same as each other. Hereinafter, in the specification, the direction in which the third assembly 20c is disposed with respect to the first assembly 20a in both directions of the circumferential direction C of the stator 10 is referred to as a first circumferential direction C1, and the direction in which the second assembly 20b is disposed with respect to the first assembly 20a is referred to as a second circumferential direction C2.

[0050] Continuing to refer to Figures 1 to 3 Some of the bus bars 400 disposed in the assembly 20 of the stator 10 according to the disclosure can cross other bus bars among the plurality of bus bars 400.

[0051] More specifically, the bus bars 400 can include a first bus bar 410, a second bus bar 420, a third bus bar 430, and a fourth bus bar 440.

[0052] Here, according to the disclosure, the first bus bar 410 can sequentially cross the second bus bar 420 and the third bus bar 430. In addition, the first bus bar 410 can not cross the fourth bus bar 440, and the second bus bar 420, the third bus bar 430, and the fourth bus bar 440 can not cross each other. In addition, the second bus bar 420 and the third bus bar 430 can be disposed in parallel to each other. More preferably, the second bus bar 420 and the third bus bar 430 can have the same size and shape.

[0053] In the disclosure, the terminals for connecting the motor according to the related art to the power supply unit are removed, and instead, the plurality of bus bars are disposed. Accordingly, the volume occupied by the terminals according to the related art can be reduced, and the weight and production cost of the terminals can be reduced.

[0054] Specifically, according to the disclosure, some of the plurality of bus bars 400 disposed in the assembly 20 can have a structure in which they cross each other, and thus, the volume occupied by the plurality of bus bars serving as the terminals according to the related art can be reduced as much as possible. Accordingly, the volume and structure of the motor for an automobile according to the disclosure can be simplified.

[0055] Meanwhile, as Figure 2 and Figure 3As shown, in each of the plurality of components 20 according to an exemplary embodiment of the present disclosure, the two ends of the first busbar 410 in the circumferential direction C and the two ends of the second busbar 420 in the circumferential direction C may be configured to be separated from each other in the circumferential direction C, while also being separated from each other in the radial direction R of the stator 10. Furthermore, as Figure 2 and Figure 3 As shown, in each of the plurality of components 20 according to an exemplary embodiment of the present disclosure, the two ends of the second busbar 420 in the circumferential direction C and the two ends of the third busbar 430 in the circumferential direction C may be configured to be separated from each other in the circumferential direction C and also separated from each other in the radial direction R.

[0056] As described later, according to this disclosure, curved portions can be formed at both ends of each busbar, and the busbars can be joined by the curved portions to form a joint area. Here, according to an exemplary embodiment of this disclosure, the ends of the first to third busbars in any component can be configured to be separated from each other in the radial direction R and the circumferential direction C, thereby increasing the gap between the joint areas. Therefore, the insulation safety of the stator and motor can be improved.

[0057] like Figure 3 As shown, in each of components 20a, 20b, and 20c according to an exemplary embodiment of the present disclosure, the third busbar 430 may be disposed further outward in the radial direction R than the second busbar 420. Here, according to an exemplary embodiment of the present disclosure, the second busbar 420 may be configured to be offset relative to the stator core 100 and the winding spool 300 in a first circumferential direction C1, and the third busbar 430 may be configured to be offset relative to the stator core 100 and the winding spool 300 in a second circumferential direction C2.

[0058] In addition, such as Figures 1 to 3 As shown, according to an exemplary embodiment of the present disclosure, a bent portion 400a that bends in the axial direction A of the stator 10 may be provided on each of the two ends in the circumferential direction C of the first busbar to the fourth busbar 410, 420, 430 and 440.

[0059] Furthermore, according to this disclosure, a plurality of first components 20a can be electrically connected to each other via busbar 400, a plurality of second components 20b can be electrically connected to each other via busbar 400, and a plurality of third components 20c can be electrically connected to each other via busbar 400.

[0060] More specifically, refer to Figure 3 and Figure 4One of the curved portions 400a provided in the first bus bar 410 of the first assembly 20a can be joined to one of the curved portions 400a provided in the third bus bar 430 of the second assembly 20b to form a joining region Z, and another of the curved portions 400a provided in the first bus bar 410 of the first assembly 20a can be joined to one of the curved portions 400a provided in the second bus bar 420 of the third assembly 20c to form a joining region Z.

[0061] In addition, one of the curved portions 400a provided in the second bus bar 420 of the first assembly 20a can be joined to one of the curved portions 400a provided in the first bus bar 410 of the second assembly 20b to form a joining region Z, and another of the curved portions 400a provided in the second bus bar 420 of the first assembly 20a can be joined to one of the curved portions 400a provided in the third bus bar 430 of the third assembly 20c to form a joining region Z.

[0062] In addition, one of the curved portions 400a provided in the third bus bar 430 of the first assembly 20a can be joined to one of the curved portions 400a provided in the second bus bar 420 of the second assembly 20b to form a joining region Z, and another of the curved portions 400a provided in the third bus bar 430 of the first assembly 20a can be joined to one of the curved portions 400a provided in the first bus bar 410 of the third assembly 20c to form a joining region Z.

[0063] In addition, the curved portions 400a provided in the fourth bus bar 440 provided in each of the first assembly to the third assembly 20a, 20b, and 20c can be joined to the curved portions 400a provided in another fourth bus bar 440 adjacent in the circumferential direction C, thereby forming a joining region Z.

[0064] In addition, one of the curved portions 400a provided in the first bus bar 410 of the second assembly 20b can be joined to one of the curved portions 400a provided in the third bus bar 430 of the third assembly 20c to form a joining region Z.

[0065] In addition, one of the curved portions 400a provided in the second bus bar 420 of the second assembly 20b can be joined to one of the curved portions 400a provided in the first bus bar 410 of the third assembly 20c to form a joining region Z.

[0066] In addition, one of the curved portions 400a provided in the third bus bar 430 of the second assembly 20b can be joined to one of the curved portions 400a provided in the second bus bar 420 of the third assembly 20c to form a joining region Z.

[0067] Meanwhile, according to the present disclosure, asFigure 2 and Figure 3 As shown in FIGS. 1 and 2, the lead-in wire 210 provided in the coil 200 can be joined to a joining region formed by joining the bent portion of the first bus bar 410 to the bent portion of the third bus bar 430, and the lead-out wire 220 provided in the coil 200 can be joined to a joining region formed by joining the bent portions of the fourth bus bars 440 to each other. However, unlike as shown in FIGS. 1 and 2, the lead-in wire 210 provided in the coil 200 can be joined to a joining region formed by joining the bent portion of the first bus bar 410 to the bent portion of the second bus bar 420. Figure 2 and Figure 3 As shown in FIGS. 1 and 2, the lead-in wire 210 provided in the coil 200 can be joined to a joining region formed by joining the bent portion of the first bus bar 410 to the bent portion of the third bus bar 430, and the lead-out wire 220 provided in the coil 200 can be joined to a joining region formed by joining the bent portions of the fourth bus bars 440 to each other. However, unlike as shown in FIGS. 1 and 2, the lead-in wire 210 provided in the coil 200 can be joined to a joining region formed by joining the bent portion of the first bus bar 410 to the bent portion of the second bus bar 420.

[0068] According to the present disclosure, as described above, the lead-in wire and the lead-out wire can be joined to a joining region formed by joining the bent portions of the bus bars to each other, and thus, a separate joining process of joining the lead-in wire and the lead-out wire to the bus bars is not required. Accordingly, according to the present disclosure, it is possible to simplify a joining process required to manufacture the stator or the motor.

[0069] In the case where the first to third bus bars 410, 420, and 430 provided in the first assembly 20a, the first to third bus bars 410, 420, and 430 provided in the second assembly 20b, and the first to third bus bars 410, 420, and 430 provided in the third assembly 20c are connected to each other in the above-described manner, the lead-in wires 210 formed in the coils 200 of the first assembly 20a can be electrically connected to each other through the bus bars 400, the lead-in wires 210 formed in the coils 200 of the second assembly 20b can be electrically connected to each other through the bus bars 400, and the lead-in wires 210 formed in the coils 200 of the third assembly 20c can be electrically connected to each other through the bus bars 400.

[0070] Meanwhile, according to the present disclosure, the stator 10 can receive power from a power supply unit (not shown) that supplies three-phase AC power of U-phase power, V-phase power, and W-phase power.

[0071] Here, the first assembly 20a can receive the U-phase power from the power supply unit via the lead-in wire 210 of the first assembly 20a, the second assembly 20b can receive the V-phase power from the power supply unit via the lead-in wire 210 of the second assembly 20b, and the third assembly 20c can receive the W-phase power from the power supply unit via the lead-in wire 210 of the third assembly 20c. That is, the first to third assemblies 20a, 20b, and 20c can receive power having different phases via the respective lead-in wires 210.

[0072] Meanwhile, the first to third assemblies 20a, 20b, and 20c can be connected to the neutral line via the respective lead lines 220 of the first to third assemblies 20a, 20b, and 20c. Accordingly, all of the first to third assemblies 20a, 20b, and 20c can be connected to the neutral line through the lead lines 220.

[0073] Figure 5 is a perspective view showing a structure of a stator for an electric motor according to another exemplary embodiment of the present disclosure, Figure 6 is an enlarged side view showing an assembly constituting a stator for an electric motor according to another exemplary embodiment of the present disclosure. Hereinafter, the stator according to another exemplary embodiment of the present disclosure will be mainly described with respect to the differences from the features already described above. To the extent that the features described above with respect to the stator according to the present disclosure do not contradict the features described below with respect to the stator according to another exemplary embodiment of the present disclosure, the features described above with respect to the stator according to the present disclosure can also be applied to the stator according to another exemplary embodiment of the present disclosure in the same manner.

[0074] According to the present disclosure as shown in Figure 5 and Figure 6 According to another exemplary embodiment of the present disclosure as shown in

[0075] More specifically, the third bus bar 430 can be disposed above the second bus bar 420 in the axial direction A of the stator 10. Here, according to another exemplary embodiment of the present disclosure, the second bus bar 420 can be disposed to be offset in the first circumferential direction C1 with respect to the stator core 100 and the coil bobbin 300, and the third bus bar 430 can be disposed to be offset in the second circumferential direction C2 with respect to the stator core 100 and the coil bobbin 300.

[0076] Further, as shown in Figure 5 and Figure 6As shown, according to another exemplary embodiment of the present disclosure, a curved portion 400a that bends outward in the radial direction R may be provided at each of the two ends in the circumferential direction C of the first to fourth busbars 410, 420, 430 and 440.

[0077] In addition to the features of the stator according to another exemplary embodiment of the present disclosure already described above, the features of the stator according to another exemplary embodiment of the present disclosure can be referred to... Figures 1 to 4 Additional features described.

[0078] At the same time, such as Figure 3 and Figure 6 As shown, the curved portions 400a provided at both ends of the first busbar 410 provided in the first component 20a of the stator 10 according to the present disclosure can be respectively provided within the width of the second component 20b and the third component 20c in the circumferential direction C, wherein the third component 20c is adjacent to the first component 20a in the circumferential direction C. This can be understood as, when the stator 10 according to the present disclosure is viewed from the side in the radial direction R, the curved portions of the first busbar 410 provided in each component are arranged to overlap with the adjacent components.

[0079] In addition, such as Figure 3 and Figure 6 As shown, a curved portion 400a provided at both ends of the second busbar 420 provided in the first component 20a of the stator 10 according to the present disclosure may be provided within the width of the first component 20a in the circumferential direction C, and another curved portion 400a may be provided in the circumferential direction C in the region between the first component 20a and the third component 20c adjacent to the first component 20a in the circumferential direction C.

[0080] In addition, such as Figure 3 and Figure 6 As shown, a curved portion 400a provided at both ends of the third busbar 430 provided in the first component 20a of the stator 10 according to the present disclosure may be provided within the width of the first component 20a in the circumferential direction C, and another curved portion 400a may be provided in the circumferential direction C in the region between the first component 20a and the second component 20b adjacent to the first component 20a in the circumferential direction C.

[0081] Furthermore, according to this disclosure, such as Figure 4As shown in FIG. 1, a portion of the winding bobbin 300 can be disposed between two of the joint regions Z formed by two adjacent bending portions 400a. This can be understood as a portion of the winding bobbin 300 being disposed within a shortest distance of a straight path between two joint regions Z. In this case, the distance between two adjacent joint regions Z can be increased, and thus, the electrical insulation property can be improved.

[0082] Meanwhile, according to an exemplary embodiment of the present disclosure as Figures 1 to 4 As shown in an exemplary embodiment of the present disclosure as

[0083] On the other hand, according to another exemplary embodiment of the present disclosure as Figure 5 and Figure 6 As shown in an exemplary embodiment of the present disclosure as

[0084] Electric machine

[0085] Referring to Figures 1 to 6 , the electric motor according to the present disclosure can include a stator 10 and a rotor (not shown). More preferably, the stator 10 can have a structure having a hole formed at a center of the stator by arranging a plurality of assemblies 20 in a circumferential direction C, the rotor being disposed in the hole.

[0086] Here, according to the present disclosure, each of the plurality of assemblies 20 can include a stator core 100, a winding bobbin 300 disposed to surround an outer surface of the stator core 100, a coil 200 wound around the winding bobbin 300 a plurality of times and having lead-in wires 210 and lead-out wires 220 disposed at each end of the coil, and a plurality of bus bars 400 disposed on the winding bobbin 300.

[0087] Further, the plurality of bus bars 400 can include a first bus bar 410, a second bus bar 420, and a third bus bar 430, and a fourth bus bar 440.

[0088] Further, in the plurality of assemblies 20, both ends of the first bus bar 410 in the circumferential direction C and both ends of the second bus bar 420 in the circumferential direction C can be disposed to be spaced apart from each other in the circumferential direction C while being spaced apart from each other in the radial direction R or the axial direction A.

[0089] According to the present disclosure, an existing terminal can be removed, thereby reducing the weight and production cost of a driving motor of a vehicle, increasing the space utilization rate around the motor, and simplifying the structure of the motor.

[0090] Further, according to the present disclosure, when compared with related art, the process required for welding in the manufacturing process of the motor can be simplified, and the insulation safety can be improved by securing a sufficient gap between regions to be welded.

[0091] Although the present disclosure has been described with reference to specific exemplary embodiments and drawings, the present disclosure is not limited thereto and it is obvious that those skilled in the art to which the present disclosure pertains can make various changes and modifications within the technical idea of the present disclosure and the equivalent scope of the appended claims.

Claims

1. A stator for an electric motor, comprising a hole formed at the center of the stator by arranging a plurality of components along a circumferential direction (C) of the stator. Each of the plurality of components includes: Stator core; A winding bobbin is configured to surround the outer surface of the stator core; A coil, which is wound multiple times around the spool and has lead-in and lead-out wires at each end of the coil; as well as Multiple busbars are mounted on the spool. The plurality of bus bars includes a first bus bar, a second bus bar, and a third bus bar. In the plurality of components, the two ends of the first busbar in the circumferential direction (C) and the two ends of the second busbar in the circumferential direction (C) are separated from each other in the circumferential direction (C), and are also separated from each other in the radial direction (R) or axial direction (A) of the stator. In the plurality of components, the two ends of the second busbar in the circumferential direction (C) and the two ends of the third busbar in the circumferential direction (C) are separated from each other in the circumferential direction (C), and are also separated from each other in the radial direction (R) or the axial direction (A). The first busbar intersects with the second busbar and the third busbar. The third busbar is positioned further outward in the radial direction (R) than the second busbar. Among the plurality of components, the second busbar is configured to be offset in a first circumferential direction (C1) relative to the stator core and the winding spool in the two directions of the circumferential direction (C), and the third busbar is configured to be offset in a second circumferential direction (C2) relative to the stator core and the winding spool in the two directions of the circumferential direction (C). The curved portion bending in the axial direction (A) of the stator is provided at each of the two ends of the first busbar to the third busbar in the circumferential direction (C). The plurality of components are divided into one or more first components, one or more second components, and one or more third components, and Each of the first component, each of the second component, and each of the third component are arranged alternately along the circumferential direction (C). A first curved portion of the curved portion in the first busbar of one or more first components engages with a first curved portion of the curved portion in the third busbar of one or more second components immediately following the first component to form an engagement region; and a second curved portion of the curved portion in the first busbar of the first component engages with a first curved portion of the curved portion in the second busbar of one or more third components immediately preceding the first component to form an engagement region. A first curved portion of the curved portion provided in the second busbar of the first component engages with the first curved portion of the curved portion provided in the first busbar of the second component to form an engagement region, and a second curved portion of the curved portion provided in the second busbar of the first component engages with the first curved portion of the curved portion provided in the third busbar of the third component to form an engagement region. A first curved portion of the curved portion provided in the third busbar of the first component engages with a first curved portion of the curved portion provided in the second busbar of the second component to form an engagement region, and a second curved portion of the curved portion provided in the third busbar of the first component engages with a first curved portion of the curved portion provided in the first busbar of the third component to form an engagement region. The lead-in wire and the lead-out wire are joined to the joining area formed by joining the curved portions of the busbar together. The stator receives power from a power supply unit configured to supply three-phase power, including U-phase, V-phase, and W-phase power. The first component receives the U-phase power from the power supply unit through the lead-in line of the first component. The second component receives the V-phase power from the power supply unit through the lead-in line of the second component, and The third component receives the W-phase power from the power supply unit via the lead-in line of the third component. The first component, the second component, and the third component are connected to the neutral line via the lead-out line.

2. The stator according to claim 1, wherein the third busbar is disposed upward from the second busbar in the axial direction (A), Among the plurality of components, the second busbar is configured to be offset in a first circumferential direction (C1) relative to the stator core and the winding spool in the two directions of the circumferential direction (C), and the third busbar is configured to be offset in a second circumferential direction (C2) relative to the stator core and the winding spool in the two directions of the circumferential direction (C).

3. The stator according to claim 1, wherein the plurality of components have sufficient similarity to be compatible with each other.

4. The stator according to claim 2, wherein the outwardly curved portion in the radial direction (R) is provided at each of the two ends of the first busbar to the third busbar in the circumferential direction (C).

5. The stator according to claim 1, wherein the curved portions provided at both ends of the first busbar provided in the first component are respectively provided within the width of the second component and the third component in the circumferential direction (C), wherein the third component is adjacent to the first component in the circumferential direction (C).

6. The stator according to claim 1, wherein the first curved portion of the curved portion disposed at both ends of the second busbar disposed in the first component is disposed within the width of the first component in the circumferential direction (C), and the second curved portion of the curved portion disposed in the second busbar disposed in the first component is disposed in the region between the first component and the third component adjacent to the first component in the circumferential direction (C).

7. The stator according to claim 1, wherein a first curved portion of the curved portion disposed at both ends of the third busbar disposed in the first component is disposed within the width of the first component in the circumferential direction (C), and a second curved portion of the curved portion disposed in the third busbar disposed in the first component is disposed in the region between the first component and a second component adjacent to the first component in the circumferential direction (C).

8. The stator of claim 1, wherein a second bent portion of the bent portion disposed in the first busbar of the second component engages with a first bent portion of the bent portion disposed in the third busbar of another third component to form an engagement region, the other third component being configured to immediately follow the second component among the one or more third components. The second curved portion of the curved portion provided in the second busbar of the second component engages with the first curved portion of the curved portion provided in the first busbar of the third component immediately following the second component, to form an engagement area, and The second curved portion of the curved portion provided in the third busbar of the second component engages with the first curved portion of the curved portion provided in the second busbar of the third component immediately following the second component to form an engagement area.

9. The stator of claim 8, wherein a portion of the winding spool is disposed between two adjacent engagement regions among the plurality of engagement regions.

10. The stator of claim 8, wherein the plurality of busbars further comprises a fourth busbar, and The curved portion bending in the axial direction (A) or the radial direction (R) is provided at each of the two ends of the fourth busbar in the circumferential direction (C). The curved portion provided in the fourth busbar engages with another curved portion provided in the adjacent fourth busbar to form an engagement area.

11. The stator according to claim 10, wherein the first busbar to the third busbar are disposed outside the winding spool in the radial direction (R), and The fourth busbar is disposed inside the spool in the radial direction (R).

12. The stator according to claim 10, wherein the first busbar to the third busbar are disposed in the upper region of the winding spool in the axial direction (A), and The fourth busbar is disposed in the lower region of the winding spool in the axial direction (A).

13. The stator of claim 10, wherein the lead wire of each of the plurality of components engages with the engagement region formed by one of the bends of the first busbar and one of the bends of the third busbar, or engages with the engagement region formed by the other of the bends of the first busbar and one of the bends of the second busbar, and The lead wire of each of the plurality of components is engaged with the engagement area formed by the bend of the fourth busbar.

14. An electric motor, comprising: Stator according to any one of claims 1 to 13; as well as Rotor.

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