Bus bar and motor including the same
The busbar terminal's combined structure with a body and power terminal portion, featuring an embossed design, addresses scrap and plating cost issues in conventional terminals, achieving reduced waste and lower production costs while supporting versatile power connections.
Patent Information
- Application Number
- JP2025174756
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2020-11-11
- Filing Date
- 2025-10-16
- Publication Date
- 2025-12-25
Smart Images
Figure 2025188240000001_ABST
Abstract
Description
[Technical Field]
[0001] The embodiments relate to a bus bar and a motor including the bus bar. [Background technology]
[0002] The motor may include a bus bar disposed on an upper portion of a stator, wherein the bus bar may include bus bar terminals coupled to ends of coils disposed on the stator.
[0003] Conventional busbar terminals are manufactured by cutting a single sheet of material to form a primary material, which is then bent to form the finished busbar terminal. However, conventional busbar terminals have a problem in that a large amount of scrap is generated during the forming process of cutting a single sheet of material.
[0004] In addition, one side of the conventional busbar terminal may be connected to a device such as a connector for applying an external power supply. As a result, the plating process must be performed on the entire conventional busbar terminal, which increases production costs. Furthermore, due to the complex structure of the conventional busbar terminal, which requires multiple bending processes, the plating process must be performed using a rack plating method, which further increases production costs.
[0005] Therefore, there is a need to develop a bus bar terminal structure that can minimize scrap while reducing plating costs. Summary of the Invention [Problem to be solved by the invention]
[0006] The embodiments provide a busbar and a motor including the same that minimize scrap generation by using a busbar terminal realized by connecting two members.
[0007] The embodiments provide a busbar and a motor including the busbar, which improves the fixing force between two members constituting a busbar terminal by using an embossed structure when fusing the two members.
[0008] Another object of the present invention is to provide a motor that is compatible with various connection positions of external power sources. [Means for solving the problem]
[0009] The object of the present invention is to provide a motor including a stator, a rotor disposed corresponding to the stator, a shaft coupled to the rotor, and a busbar disposed above the stator, the busbar including a busbar body and a plurality of busbar terminals disposed on the busbar body, the busbar terminal including a body portion and a power terminal portion coupled to the body portion, the body portion including a body, a plurality of terminal portions disposed on the body, and a protrusion protruding in an axial direction from an upper surface of the body, wherein a lower surface of the power terminal portion is in contact with an inner surface of the protrusion, and wherein lower ends of the power terminal portions may be disposed axially spaced apart from each other by a predetermined distance d from an upper surface of the body.
[0010] The object is achieved by providing a busbar body and a plurality of busbar terminals that are coupled together through a fusing process, the busbar terminal including a body portion and a power terminal portion coupled to the body portion, the body portion including a body, a plurality of terminal portions disposed on the body, and a protrusion that protrudes in an axial direction from an upper surface of the body, and one surface of a lower side of the power terminal portion is provided by a busbar that contacts an inner surface of the protrusion.
[0011] The power terminal portion includes a first region arranged on the upper surface of the body so as to be spaced apart at a predetermined distance d, a second region extending radially from an end of the first region, and a third region extending axially from an end of the second region, and the outer surface of the first region can contact the inner surface of the protrusion and the lower surface of the second region can contact the upper surface of the protrusion.
[0012] Here, the power terminal portion includes a first region arranged on the upper surface of the body to be spaced apart at a predetermined interval d, a second region extending radially from an end of the first region, a third region extending axially from an end of the second region, and an embossment protruding from an outer surface of the first region, and the embossment formed in a hemispherical shape may be in point contact with an inner surface of the protrusion.
[0013] The protrusion includes a first protrusion portion formed to extend axially from the upper surface of the body and a second protrusion portion extending so as to be bent outward from an end of the first protrusion portion, and the power terminal portion includes a first region arranged to be spaced apart at a predetermined distance d on the upper surface of the body, a second region extending radially from an end of the first region, and a third region extending axially from an end of the second region, and the inner surface of the second protrusion portion can contact the outer surface of the first region.
[0014] In addition, the protrusion includes a first protrusion portion formed to extend axially from the upper surface of the body and a second protrusion portion extending so as to be bent outward from an end of the first protrusion portion, and the power terminal portion includes a first region arranged to be spaced apart from the upper surface of the body at a predetermined distance d, a second region extending radially from an end of the first region, a third region extending axially from an end of the second region, and an embossment protruding from an outer surface of the first region, and the embossment formed in a hemispherical shape may be in point contact with an inner surface of the second protrusion portion.
[0015] According to an embodiment, a motor may be provided, which includes a shaft, a rotor coupled to the shaft, and a stator arranged to correspond to the rotor, the stator including a stator core, an insulator coupled to the stator core, and a coil arranged on the insulator, a plurality of busbar terminals electrically connected to the coils, and a busbar holder supporting the busbar terminals, each of the plurality of busbar terminals including a first body and a second body coupled to the first body, at least some of the plurality of busbar terminals being coupled to the second body by the first body being twisted, and at least some of the plurality of busbar terminals being arranged such that the centers of curvature of the second bodies are different from each other. [Effects of the Invention]
[0016] The bus bar and the motor including the bus bar according to the embodiment may use a bus bar terminal embodied in a combined structure of a body portion and a power terminal portion, thereby minimizing scrap generated during formation of the bus bar terminal.
[0017] In addition, in the embodiment, a plating process can be performed on the entire surface of the power terminal portion, and multiple power terminal portions can be plated using a parallel plating method, thereby minimizing plating costs.
[0018] The embodiment has an advantage of providing a bus bar terminal that is compatible with various connection positions of an external power source.
[0019] The embodiment has an advantage that the manufacturing process can be simplified by reducing the number of bending steps of the bus bar terminals. [Brief explanation of the drawings]
[0020] [Figure 1] 1 is a diagram showing a motor according to an embodiment; [Figure 2] 1 is a cross-sectional view showing a motor according to an embodiment. [Figure 3]FIG. 2 is a perspective view showing a bus bar of the motor according to the first embodiment. [Figure 4] 2 is a perspective view showing a plurality of bus bar terminals of a bus bar arranged in the motor according to the first embodiment. FIG. [Figure 5] 2 is a plan view showing a plurality of bus bar terminals of a bus bar arranged in the motor according to the first embodiment. FIG. [Figure 6] FIG. 2 is a development view showing a body portion of a bus bar terminal disposed in the motor according to the first embodiment. [Figure 7] FIG. 2 is a perspective view showing a first embodiment of a bus bar terminal arranged in the motor according to the first embodiment. [Figure 8] FIG. 2 is an exploded perspective view showing a first embodiment of a bus bar terminal arranged in the motor according to the first embodiment. [Figure 9] 1 is a plan view showing a first embodiment of a bus bar terminal arranged in a motor according to the first embodiment. FIG. [Figure 10] 1 is a side view showing a first embodiment of a bus bar terminal arranged in a motor according to the first embodiment. FIG. [Figure 11] FIG. 10 is a cross-sectional view taken along line BB in FIG. 9. [Figure 12] 10 is a modified example of the body portion of the bus bar terminal according to the first embodiment, which is arranged in the motor according to the first embodiment. [Figure 13] FIG. 10 is a perspective view showing a second embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 14] FIG. 10 is an exploded perspective view showing a second embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 15] FIG. 10 is a plan view showing a second embodiment of the bus bar terminals arranged in the motor according to the first embodiment. [Figure 16] FIG. 10 is a side view showing a second embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 17] FIG. 16 is a cross-sectional view taken along line CC in FIG. [Figure 18]10 is a modified example of the body portion of the bus bar terminal according to the second embodiment, which is arranged in the motor according to the first embodiment. [Figure 19] FIG. 10 is a perspective view showing a third embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 20] FIG. 10 is an exploded perspective view showing a third embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 21] FIG. 10 is a plan view showing a third embodiment of the bus bar terminals arranged in the motor according to the first embodiment. [Figure 22] FIG. 10 is a side view showing a third embodiment of the bus bar terminal arranged in the motor according to the first embodiment. [Figure 23] FIG. 22 is a cross-sectional view taken along the line DD in FIG. 21. [Figure 24] 10 is a diagram showing a power terminal portion of a bus bar terminal according to a third embodiment disposed in the motor according to the first embodiment. [Figure 25] 10 is a diagram illustrating a bus bar terminal and a bus bar holder of a motor according to a second embodiment. [Figure 26] FIG. 10 is a plan view illustrating the bus bar terminals of the motor according to the second embodiment. [Figure 27] FIG. 10 is a plan view of the busbar illustrating the overlapping area of the busbar terminals of the motor according to the second embodiment. [Figure 28] FIG. 27 is an exploded view of the bus bar terminal shown in FIG. 26. [Figure 29] FIG. 2 is a perspective view of an assembled bus bar terminal. [Figure 30] 1 is a view illustrating a bus bar terminal including a first body in a bent shape. [Figure 31] FIG. 31 is a perspective view of the assembled bus bar terminal of FIG. 30. [Figure 32] 10 is a diagram illustrating a plate material forming a second body of the bus bar terminal and an exploded view thereof; [Figure 33]1 is a development view of a plate member forming a first body of the bus bar terminal; [Figure 34] FIG. 2 is a plan view of the bus bar terminal, illustrating an enlarged cross-sectional shape of the bus bar terminal; DETAILED DESCRIPTION OF THE INVENTION
[0021] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical concept of the present invention is not limited to the described embodiments, and may be embodied in various different forms, and one or more of the components may be selectively combined or substituted between the embodiments.
[0022] Furthermore, when it is described as being formed or disposed "above or below" each component, "above" or "below" includes not only the case where two components are in direct contact with each other, but also the case where one or more other components are formed or disposed between the two components. Furthermore, when it is expressed as "above or below," it can mean not only the upper direction but also the lower direction based on one component.
[0023] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the drawing reference numerals, and redundant description thereof will be omitted.
[0024] First Example
[0025] FIG. 1 is a view showing a motor according to a first embodiment, and FIG. 2 is a cross-sectional view showing the motor according to the first embodiment. Here, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. In FIG. 1, the x direction may refer to the radial direction, and the y direction may refer to the axial direction. The axial direction and the radial direction may be perpendicular to each other. Here, the axial direction may be the length direction of the shaft 500.
[0026] 1 and 2, the motor according to the first embodiment may include a housing 100 having an opening on one side, a cover 200 disposed on the housing 100, a stator 300 disposed inside the housing 100, a rotor 400 disposed inside the stator 300, and a shaft 500 coupled to the rotor 400. Here, the term "inner" may refer to a direction disposed toward a rotation center C of the motor based on the radial direction, and the term "outer" may refer to a direction opposite to the inner side.
[0027] The motor may also include a bus bar 600 disposed above the stator 300 and a sensor unit 900 for detecting the rotation of the rotor 400 .
[0028] The housing 100 and the cover 200 may form the outer shape of the motor. An accommodating space may be formed inside the housing 100 and the cover 200 when they are combined. As shown in FIG. 2, the stator 300, the rotor 400, the shaft 500, the bus bar 600, the sensor unit 900, etc. may be disposed in the accommodating space.
[0029] At this time, the shaft 500 is rotatably disposed in the receiving space. Therefore, the motor may further include bearings B disposed on the upper and lower parts of the shaft 500. Here, the bearing B disposed in the housing 100 may be referred to as a first bearing or a lower bearing, and the bearing B disposed in the cover 200 may be referred to as a second bearing or an upper bearing.
[0030] The housing 100 may be formed in a cylindrical shape. The housing 100 may accommodate the stator 300, the rotor 400, etc. Therein. The shape and material of the housing 100 may be variously changed. For example, the housing 100 may be made of a metal material that can withstand high temperatures.
[0031] The housing 100 may include a pocket portion at the bottom thereof that can accommodate the bearing B. Here, the pocket portion of the housing 100 may be referred to as a housing pocket portion.
[0032] The cover 200 can be placed on the opening surface of the housing 100, i.e., on the top of the housing 100, so as to cover the opening of the housing 100.
[0033] The cover 200 may include a pocket portion capable of accommodating the bearing B. Here, the pocket portion of the cover 200 may be referred to as a cover pocket portion.
[0034] The stator 300 induces an electrical interaction with the rotor 400 to induce rotation of the rotor 400 .
[0035] The stator 300 may be disposed inside the housing 100. In this case, the stator 300 may be supported on the inner circumferential surface of the housing 100. The stator 300 may be disposed outside the rotor 400. That is, the rotor 400 may be rotatably disposed inside the stator 300.
[0036] Referring to FIGS. 1 and 2, a stator 300 may include a stator core 310 , an insulator 320 disposed on the stator core 310 , and a coil 330 wound around the insulator 320 .
[0037] A coil 330 for generating a rotating magnetic field may be wound around the stator core 310. Here, the stator core 310 may be formed of a single core or a plurality of divided cores connected together.
[0038] The stator core 310 may be formed by stacking a plurality of thin steel plates, but is not limited thereto. For example, the stator core 310 may be formed as a single piece.
[0039] The stator core 310 may include a yoke 311, a plurality of teeth 312, and a shoe 313 formed on the inner end of the tooth 312. Here, the inner surface of the shoe 313 may be formed to be parallel to an imaginary line disposed perpendicular to the radial direction on a plane.
[0040] The yoke 311 may be formed cylindrically, so that the yoke 311 may include a cross section that is ring-shaped in plan view.
[0041] The teeth 312 may be spaced apart from one another along the circumferential direction of the yoke 311. Thus, slots, which are spaces in which the coils 330 are wound, may be formed between the teeth 312.
[0042] The shoe 313 may extend so as to protrude inward from the inner end of the tooth 312. Here, the width of the shoe 313 may be greater than the width of the tooth 312.
[0043] The shoe 313 may be disposed to face the magnet 420 of the rotor 400. In this case, the shoe 313 may be disposed to be spaced apart from the outer circumferential surface of the magnet 420 by a predetermined distance in the radial direction. Here, the distance may be called an air gap, which may be the distance between the shoe 313 and the magnet 420 in the radial direction.
[0044] The insulator 320 insulates the stator core 310 from the coil 330. Thus, the insulator 320 can be disposed between the stator core 310 and the coil 330.
[0045] Therefore, the coil 330 can be wound around the stator core 310 on which the insulator 320 is disposed.
[0046] The rotor 400 rotates through electrical interaction with the stator 300. In this case, the rotor 400 may be rotatably disposed relative to the stator 300.
[0047] The rotor 400 may include a rotor core 410 and a plurality of magnets 420 disposed outside the rotor core 410. The rotor 400 may also include a can disposed outside the rotor core 410 to which the magnets 420 are coupled in order to prevent the magnets 420 from coming off and to increase coupling strength. In this case, the magnets 420 may be disposed at predetermined intervals along the circumferential direction of the rotor core 410 based on the center C.
[0048] The rotor core 410 may be implemented in the form of a plurality of thin steel plates stacked together, or in the form of a single cylinder.
[0049] A hole to which the shaft 500 is coupled may be formed at the center C of the rotor core 410 .
[0050] The magnet 420 forms a rotating magnetic field together with the coil 330 wound around the stator core 310 of the stator 300 .
[0051] As a result, the rotor 400 rotates due to electrical interaction between the coil 330 and the magnet 420, and the shaft 500 rotates in conjunction with the rotation of the rotor 400, thereby generating a driving force for the motor.
[0052] Here, the magnet 420 is disposed outside the rotor core 410 to realize a surface permanent magnet (SPM) type rotor.
[0053] The can can protect the rotor core 410 and the magnet 420 from physical or chemical stimuli. In addition, the can can prevent the magnet 420 from being separated from the rotor core 410. Here, the can can be disposed to cover the magnet 420 disposed on the rotor core 410.
[0054] The shaft 500 can be rotatably disposed inside the housing 100 by means of a bearing B. The shaft 500 can rotate together with the rotor 400 in conjunction with its rotation.
[0055] The shaft 500 may be coupled to a hole formed in the center of the rotor core 410 by press-fitting.
[0056] 2, the bus bar 600 may be disposed on the top of the stator 300. The bus bar 600 may be electrically connected to the coils 330 of the stator 300.
[0057] FIG. 3 is a perspective view showing a bus bar of the motor according to the first embodiment, FIG. 4 is a perspective view showing multiple bus bar terminals of a bus bar arranged in the motor according to the first embodiment, FIG. 5 is a plan view showing multiple bus bar terminals of a bus bar arranged in the motor according to the first embodiment, and FIG. 6 is an exploded view showing a body portion of a bus bar terminal arranged in the motor according to the first embodiment.
[0058] 3 to 5, the bus bar 600 may include a bus bar body 700 made of an insulating material and a plurality of bus bar terminals 800 disposed on the bus bar body 700.
[0059] The busbar body 700 may be a molded product formed by injection molding. Thus, the busbar 600 may be formed by injecting the busbar body 700 in a state where a plurality of the busbar terminals 800 are spaced apart from one another with a predetermined gap G in the radial direction.
[0060] The bus bar terminals 800 may be arranged in a plurality of pieces spaced apart from one another in the radial direction, and each of the bus bar terminals 800 may be electrically connected to the coils 330 of the stator 300.
[0061] The bus bar terminal 800 may be formed by combining two separate members, that is, the bus bar terminal 800 may be formed by combining a body portion 810 and a power terminal portion 820. Here, the body portion 810 and the power terminal portion 820 may be combined by fusing.
[0062] Therefore, in the bus bar terminal 800 according to the embodiment, the body portion and the power terminal portion, which are integrally formed from a single plate material, are not cut at once as in the conventional bus bar terminal, but only the body portion 810 is cut to form the bus bar terminal 800. This minimizes the amount of scrap that is discarded due to cutting due to the structure.
[0063] That is, in the bus bar terminal 800 according to the embodiment, only the body portion 810 is formed from a single plate material having a predetermined thickness, thereby minimizing the amount of scrap that is cut and discarded. For example, as shown in Fig. 6, the body portion 810 is formed with a predetermined width W1, so that only the area corresponding to the body portion 810 can be cut from a single plate material to form a primary processed primary material. This minimizes the amount of scrap that is cut and discarded. The body portion 810 of the bus bar terminal 800 to be placed on the bus bar 600 can then be formed by bending the primary material.
[0064] In addition, since the bus bar terminal 800 is formed by combining two separate parts, the body part 810 and the power terminal part 820, the body part 810 and the power terminal part 820 can be plated separately.
[0065] Conventional busbar terminals have a complicated structure, so the plating process is performed using a rack plating method, which increases production costs. Here, the rack plating method can mean a method in which the object to be plated is hung on a jig or hook.
[0066] However, since the bus bar terminal 800 has a body portion 810 and a power terminal portion 820 formed as separate members, the body portion 810 may be formed by cutting and bending a pre-plated plate-shaped material. As a result, a plating layer may be formed on some surfaces of the body portion 810, while a plating layer may not be formed on the cut surface. For example, since the body portion 810 is formed by cutting a pre-plated plate-shaped material, a plating layer may not be formed on some surfaces. That is, since the body portion 810 is formed by cutting a pre-plated plate material, it may include a non-plated surface on which no plating is formed. Here, the non-plated surface may be the cut surface formed during the cutting process of the body portion 810.
[0067] The power terminal unit 820 can be plated separately using a post-plating method after cutting and bending a plate-shaped material. At this time, the power terminal unit 820 can be plated using a barrel plating method, which is inexpensive and allows multiple units to be plated at once.
[0068] Therefore, the bus bar terminal 800 can reduce costs by performing full plating on only the power terminal portion 820 for connection with a connector that applies external power. That is, a plating layer can be formed on the entire surface of the power terminal portion 820. Furthermore, since a plurality of power terminal portions 820 are plated using a barrel plating method, costs can be further reduced. Here, the barrel plating method may refer to a method in which a plurality of objects to be plated are placed in a barrel and plated.
[0069] 5, the bus bar terminals 800 may be arranged to be spaced apart from one another in the radial direction to have a predetermined gap G. More specifically, the body portions 810 of the bus bar terminals 800 may be arranged to be spaced apart from one another in the radial direction to have a predetermined gap G. In this case, an inner portion of the power terminal portion 820 may be arranged to overlap the gap G in the axial direction. However, the power terminal portion 820 may be coupled to the body portion 810 to be spaced apart from one another in the axial direction so that the bus bar terminals 800 may be physically and electrically isolated from one another.
[0070] As shown in FIG. 5, the inner end of the power terminal portion 820 of any one of the bus bar terminals 800 arranged on the outer side in the radial direction may be arranged to overlap (ie, overlap) with the body portion 810 of another bus bar terminal 800 arranged on the inner side in the axial direction.
[0071] For example, the first, second, and third busbar terminals may be arranged to be spaced apart from one another in the radial direction with respect to the center C. The inner end of the power terminal portion of the second busbar terminal may be arranged to overlap the body portion of the first busbar terminal in the axial direction. However, as in the case of a busbar terminal according to a second embodiment described below, protrusions formed on the body portion of the second busbar terminal may be bent outward during the pressing process, thereby reducing the thickness. In this case, the body portion of the first busbar terminal and the inner end of the power terminal portion of the second busbar terminal do not need to overlap in the axial direction.
[0072] Bus bar terminal according to the first embodiment
[0073] FIG. 7 is a perspective view showing a first embodiment of a bus bar terminal arranged in the motor according to the first embodiment, FIG. 8 is an exploded perspective view showing the first embodiment of a bus bar terminal arranged in the motor according to the first embodiment, FIG. 9 is a plan view showing the first embodiment of a bus bar terminal arranged in the motor according to the first embodiment, FIG. 10 is a side view showing the first embodiment of a bus bar terminal arranged in the motor according to the first embodiment, and FIG. 11 is a cross-sectional view taken along line BB in FIG. 9.
[0074] 7 to 11, the bus bar terminal 800 may include a body portion 810 electrically connected to an end of the coil 330 and a power terminal portion 820 coupled to the body portion 810. Here, the power terminal portion 820 may be electrically connected to a connector (not shown) provided for applying an external power source, and one side of the power terminal portion 820 may penetrate the cover 200 and be exposed to the outside.
[0075] The body part 810 may include a body 811, a terminal part 812 coupled to the coil 330, and a protrusion 813 protruding in the axial direction from an upper surface 811a of the body 811. Here, the body part 810 may be formed by cutting and then bending a plate-shaped material. As a result, the body 811, the terminal part 812, and the protrusion 813 may be integrally formed. The protrusion 813 may be referred to as a first protrusion.
[0076] The body 811 may be formed in an arc shape having a predetermined curvature when viewed from an axial direction, and one surface of the body 811 may be formed as a curved surface having a predetermined curvature.
[0077] A plurality of terminal portions 812 may be formed on the upper portion of the body 811. As shown in Fig. 1, three terminal portions 812 may be arranged at equal intervals in the circumferential direction based on the center C.
[0078] Here, the terminal portion 812 may be formed in a hook shape for fusing with the end of the coil 330. In this case, the terminal portion 812 may be formed to protrude radially from the upper surface 811a of the body 811.
[0079] The protrusion 813 may be formed to extend axially from the upper surface 811a of the body 811 and may contact one side of the power terminal unit 820. As shown in Fig. 9, a portion of the inner surface 813a of the protrusion 813 may contact the protrusion 813. Here, the portion of the inner surface 813a of the protrusion 813 that contacts one side of the power terminal unit 820 may be referred to as a contact surface or a fusing surface. In addition, in consideration of rigidity and process stability due to fusing, the contact surface may be 1.5 times or more the radial thickness t of the body 811.
[0080] The power terminal unit 820 may be formed by bending a plate-shaped material. In this case, one side of the power terminal unit 820 is disposed to contact the protrusion 813, and the other side may be connected to a device (not shown) for applying external power, such as a connector. Thus, power transmitted through the protrusion 813 may be transmitted to the coil 330 through the terminal unit 812.
[0081] 8 and 11, the power terminal portion 820 may include a first region 821 having one surface in contact with the protrusion 813, a second region 822 extending radially from an end of the first region 821, and a third region 823 extending axially from an end of the second region 822.
[0082] The first region 821 may be formed in the shape of a plate disposed in the axial direction, taking into consideration the amount of contact with the protrusion 813 protruding in the axial direction from the body 811. Thus, an outer surface 821a of the first region 821 may contact a portion of an inner surface 813a of the protrusion 813. The first region 821 and the protrusion 813 may be coupled together by a fusing process. Here, the first region 821 may be referred to as a lower end portion of the power terminal unit 820.
[0083] 11, the lower ends of the first regions 821 may be spaced apart from each other in the axial direction by a predetermined distance d from the upper surface 811a of the body 811. This prevents one power terminal portion 820 of the plurality of bus bar terminals 800 from contacting another body portion 810.
[0084] The second region 822 may be arranged to extend radially from an end of the first region 821 .
[0085] The lower surface of the second region 822 may contact the upper surface of the protrusion 813. As a result, the protrusion 813 may support the second region 822, thereby improving the contact amount between the body part 810 and the power terminal part 820.
[0086] Here, the lower surface of the second region 822 is in contact with the upper surface of the protrusion 813, but this is not necessarily limited to this. For example, the lower surface of the second region 822 may be spaced apart from the upper surface of the protrusion 813, and in this case, a portion of the busbar body 700 may be disposed between the upper surface of the protrusion 813 and the second region 822. However, since the fusing process is performed before the busbar body 700 is formed, there is a possibility that fluidity may occur between the body part 810 and the power terminal part 820. Therefore, it is preferable that the upper surface of the protrusion 813 and the lower surface of the second region 822 be disposed so as to be in contact with each other.
[0087] The third region 823 may be disposed to extend axially from an outer end of the second region 822. A device such as a connector for applying external power may be coupled to the third region 823. Here, the first region 821 may be referred to as an upper end of the power terminal unit 820.
[0088] FIG. 12 shows a modified example of the body portion of the bus bar terminal according to the first embodiment that is arranged in the motor according to the first embodiment.
[0089] 12, the body part 810 may further include a guide 814 for guiding the power terminal part 820. Here, the guide 814 prevents the power terminal part 820 from moving during the fusing process, thereby improving the coupling position between the body part 810 and the power terminal part 820.
[0090] The guide 814 may be provided as two protrusions spaced apart from each other in the circumferential direction on the upper surface of the protrusion 813. Therefore, the guide 814 may be called a guide protrusion.
[0091] The guide protrusion may be formed to protrude in the axial direction from the upper surface of the protrusion 813. The guide protrusion may be disposed to face a side surface of the second region 822 in the circumferential direction.
[0092] Bus bar terminal according to a second embodiment
[0093] FIG. 13 is a perspective view showing a second embodiment of the bus bar terminal arranged in the motor according to the first embodiment, FIG. 14 is an exploded perspective view showing the second embodiment of the bus bar terminal arranged in the motor according to the first embodiment, FIG. 15 is a plan view showing the second embodiment of the bus bar terminal arranged in the motor according to the first embodiment, FIG. 16 is a side view showing the second embodiment of the bus bar terminal arranged in the motor according to the first embodiment, and FIG. 17 is a cross-sectional view taken along line CC in FIG. 15.
[0094] In describing the bus bar terminal 800a according to the second embodiment with reference to FIGS. 13 to 17, the same components as those of the bus bar terminal 800 according to the first embodiment may be denoted by the same reference numerals, and detailed description thereof will be omitted.
[0095] When comparing the bus bar terminal 800 according to the first embodiment and the bus bar terminal 800a according to the second embodiment, there is a difference in the shape of the protrusions that couple with the power terminal unit 820. For example, in consideration of the rigidity of the coupling and the possibility of contact between the bus bar terminals, the bus bar terminal 800a according to the second embodiment differs from the bus bar terminal 800 according to the first embodiment in that it includes protrusions that are formed to have a stepped structure.
[0096] 13 to 17, a bus bar terminal 800a according to the second embodiment may include a body portion 810a electrically connected to an end of a coil 330 and a power terminal portion 820 coupled to the body portion 810a. Here, the body portion 810a may include a body 811, a terminal portion 812 coupled to the coil 330, and a protrusion 815 protruding in the axial direction from an upper surface 811a of the body 811. The protrusion 815 may be referred to as a second protrusion.
[0097] When comparing the protrusion 815 with the protrusion 813 of the bus bar terminal 800 according to the first embodiment, there is a difference in that the upper end is bent outward to form a stepped structure. That is, the protrusion 815 of the bus bar terminal 800a according to the second embodiment may be disposed on the body 811 instead of the protrusion 813 of the bus bar terminal 800 according to the first embodiment.
[0098] 14 and 17, the protrusion 815 may include a first protrusion 816 formed to extend in the axial direction from an upper surface 811a of the body 811, and a second protrusion 817 bent outward from an end of the first protrusion 816. As a result, an offset O may be formed between an inner surface 816a of the first protrusion 816 and an inner surface 817a of the second protrusion 817a based on the radial direction. The offset O may form a step structure on the protrusion 815.
[0099] An upper surface 816b of the first protrusion 816 may contact a lower surface of a first region 821 of the power terminal unit 820. The first protrusion 816 may support a lower end of the power terminal unit 820. Thus, the power terminal unit 820 may be disposed on the upper surface 811a of the body 811 to be spaced apart from each other in the axial direction by a predetermined distance d.
[0100] An inner surface 817a of the second protrusion 817 may contact an outer surface 821a of the first region 821. The first region 821 and the protrusion 815 may be coupled together by a fusing process. Here, the inner surface 817a of the second protrusion 817 may be the contact surface or fusing surface described above.
[0101] An upper surface 817b of the second protrusion 817 may contact a lower surface of a second region 822 of the power terminal unit 820. The second protrusion 817 may support the second region 822, thereby improving the contact amount between the body unit 810 and the power terminal unit 820.
[0102] Meanwhile, the radial thickness t2 of the second protrusion 817 may be smaller than the radial thickness t1 of the first protrusion 816. For example, the radial thickness t2 of the second protrusion 817 may be reduced through a molding process that is the same as the press process. As a result, the specific gravity of the second protrusion 817 and the power terminal portion 820 in the radial direction may be reduced through a fusing process, thereby reducing the possibility of contact with other bus bar terminals 800a.
[0103] FIG. 18 shows a modified example of the body portion of the bus bar terminal according to the second embodiment that is disposed in the motor according to the first embodiment.
[0104] Referring to FIG. 18, the body portion 810 a may further include a guide 814 for guiding the power terminal portion 820 .
[0105] The guide 814 may be provided as two protrusions spaced apart from each other in the circumferential direction on the upper surface 817b of the second protrusion 817. Accordingly, the guide 814 may be referred to as a guide protrusion.
[0106] The guide protrusion may be formed to protrude in the axial direction from an upper surface 817b of the second protrusion portion 817. The guide protrusion may be disposed to face a side surface of the second region 822 in the circumferential direction.
[0107] Bus bar terminal according to a third embodiment
[0108] FIG. 19 is a perspective view showing a third embodiment of the bus bar terminal arranged in the motor of the first embodiment, FIG. 20 is an exploded perspective view showing the third embodiment of the bus bar terminal arranged in the motor of the first embodiment, FIG. 21 is a plan view showing the third embodiment of the bus bar terminal arranged in the motor of the first embodiment, FIG. 22 is a side view showing the third embodiment of the bus bar terminal arranged in the motor of the first embodiment, FIG. 23 is a cross-sectional view showing the DD line in FIG. 21, and FIG. 24 is a drawing showing the power terminal portion of the bus bar terminal according to the third embodiment arranged in the motor of the first embodiment.
[0109] In describing the bus bar terminal 800b according to the third embodiment with reference to FIGS. 19 to 24, the same components as those of the bus bar terminal 800 according to the first embodiment may be denoted by the same reference numerals, and detailed description thereof will be omitted.
[0110] When comparing the bus bar terminal 800 according to the first embodiment and the bus bar terminal 800b according to the third embodiment, there is a difference in the shape of the power terminal portion that is coupled to the body portion 810. For example, in consideration of the rigidity of the coupling through the fusing process, the power terminal portion 820a of the bus bar terminal 800b according to the third embodiment differs from the bus bar terminal 800 according to the first embodiment in that it includes an embossed structure.
[0111] 19 to 24, a bus bar terminal 800b according to the third embodiment may include a body portion 810 electrically connected to an end of a coil 330 and a power terminal portion 820a coupled to the body portion 810.
[0112] Here, the power terminal portion 820a may include a first region 821, a second region 822 extending radially from an end of the first region 821, a third region 823 extending axially from an end of the second region 822, and an embossment 824 formed to protrude radially from an outer surface 821a of the first region 821.
[0113] The embossment 824 may be formed to protrude radially toward the protrusion 813. The embossment 824 may be disposed to contact the inner surface 813a of the protrusion 813.
[0114] The embossment 824 may be formed by pressing the inner surface of the first region 821 to cause a portion of the outer surface 821a to protrude.
[0115] 24, the embossment 824 may be formed in a hemispherical shape, thereby allowing the embossment 824 to make point contact with the inner surface 813a of the protrusion 813. Therefore, during the fusing process, the current density increases at the contact point P between the protrusion 813 and the embossment 824, and the fusing process begins at the contact point P, thereby improving the fixing force between the body portion 810 and the power terminal portion 820a.
[0116] Although the bus bar terminal 800b according to the third embodiment has been described based on the body 810 of the bus bar terminal 800 according to the first embodiment, the present invention is not necessarily limited to this. For example, it goes without saying that the body 810a of the bus bar terminal 800a according to the second embodiment may be applied instead of the body 810 of the bus bar terminal 800 according to the first embodiment.
[0117] The sensor unit 900 senses the magnetic force of a sensing magnet installed so as to be rotatably linked with the rotor 400 to grasp the current position of the rotor 400, thereby enabling the rotation of the shaft 500 to be sensed.
[0118] The sensor unit 900 may include a sensing magnet assembly 910 and a printed circuit board (PCB) 920.
[0119] The sensing magnet assembly 910 is coupled to the shaft 500 so as to move in conjunction with the rotor 400 and detect the position of the rotor 400. In this case, the sensing magnet assembly 910 may include a sensing magnet and a sensing plate.
[0120] The sensing magnet may include a main magnet disposed in a circumferential direction adjacent to a hole forming an inner circumferential surface, and a sub-magnet formed on an edge.
[0121] The main magnet may be arranged in the same manner as the drive magnet inserted into the rotor 400 of the motor.
[0122] The sub-magnet may be divided into smaller parts than the main magnet and may have more poles, thereby enabling the sub-magnet to measure the rotation angle by dividing it into smaller parts and guiding the motor drive more smoothly.
[0123] The sensing plate may be formed of a metal material in a disk shape. A sensing magnet may be coupled to the upper surface of the sensing plate. The sensing plate may be coupled to the shaft 500. Here, the sensing plate may have a hole through which the shaft 500 passes.
[0124] A sensor for sensing the magnetic force of the sensing magnet may be disposed on the printed circuit board 920. Here, the sensor may be implemented as a Hall IC. The sensor may sense changes in the north and south poles of the sensing magnet and generate a sensing signal. Therefore, the printed circuit board 920 on which the Hall IC is disposed may be called a sensing assembly or a position sensing device.
[0125] Second Example
[0126] The direction parallel to the length of the shaft (vertical direction) is called the axial direction, the direction perpendicular to the axial direction around the shaft is called the radial direction, and the direction along a circle with a radius in the radial direction around the shaft is called the circumferential direction.
[0127] The motor according to the second embodiment may include a housing 100, a cover 200, a stator 300, a rotor 400, a shaft 500, and a bus bar 600. Here, the shaft 500 may be a hollow member.
[0128] The bus bar 600 of the motor according to the second embodiment may include a bus bar holder 1700 and a bus bar terminal 1800 .
[0129] Busbar holder 1700 supports busbar terminals 1800. Busbar holder 1700 may be an annular member that houses busbar terminals 1800. Here, busbar holder 1700 has a configuration corresponding to the busbar body of the motor according to the first embodiment, and may be referred to as a busbar body.
[0130] The bus bar terminals 1800 may be disposed on the stator 300. The bus bar terminals 1800 may be electrically connected to the coils 330. The bus bar terminals 1800 may then be connected to an external power source.
[0131] FIG. 25 is a diagram illustrating the busbar terminals and the busbar holder, FIG. 26 is a plan view illustrating the busbar terminals, and FIG. 27 is a plan view of the busbar illustrating the overlapping areas of the busbar terminals.
[0132] 25 and 26, bus bar terminal 1800 is disposed inside bus bar holder 1700. One end of bus bar terminal 1800 is disposed exposed to the outside of the outer circumferential surface of bus bar holder 1700 to be connected to coil 330. The area where one end of bus bar terminal 1800 contacts coil 330 may be uniformly exposed to the outside of the outer circumferential surface of bus bar holder 1700 in the radial direction. The other end of bus bar terminal 1800 may be disposed exposed on the upper surface of bus bar holder 1700 to be connected to an external power source.
[0133] The plurality of busbar terminals 1800 may be divided into a first group G1, a second group G2, and a neutral busbar 1800N. The first group G1 and the second group G2 may be composed of busbar terminals 1800 to which U-phase, V-phase, and W-phase power supplies are connected, respectively. The first group G1 and the second group G2 may be arranged to be electrically separated. The coils 330 contacting the busbar terminals 1800 of the first group G1 may be arranged to be electrically separated from the coils 330 contacting the busbar terminals 1800 of the second group G2.
[0134] The first group G1 may include a first bus bar terminal 1800A, a second bus bar terminal 1800B, and a third bus bar terminal 1800C. The first bus bar terminal 1800A, the second bus bar terminal 1800B, and the third bus bar terminal 1800C may be connected to U-phase, V-phase, and W-phase power supplies, respectively. The second group G2 may include a fourth bus bar terminal 1800D, a fifth bus bar terminal 1800E, and a sixth bus bar terminal 1800F. The fourth bus bar terminal 1800D, the fifth bus bar terminal 1800E, and the sixth bus bar terminal 1800F may be connected to U-phase, V-phase, and W-phase power supplies, respectively.
[0135] The first group G1 and the second group G2 may be arranged in a spatially separated manner.
[0136] The features of the bus bar terminal 1800 described below correspond to common features of the bus bar terminals 1800 of the first group G1 and the second group G2.
[0137] FIG. 28 is an exploded view of the bus bar terminal 1800 shown in FIG. 26, and FIG. 29 is a perspective view of the assembled bus bar terminal 1800.
[0138] 28 and 29, the bus bar terminal 1800 may include a first body 1810 and a second body 1820. The first body 1810 and the second body 1820 may be formed as separate parts, and the first body 1810 may be mechanically coupled to the second body 1820, or the first body 1810 may be welded to the second body 1820. Here, the first body 1810 may have a configuration corresponding to the power terminal unit 820 of the motor according to the first embodiment, and the second body 1820 may have a configuration corresponding to the body unit 810 of the motor according to the first embodiment. Therefore, the first body 1810 may be referred to as a power terminal unit, and the second body 1820 may be referred to as a body unit.
[0139] The first body 1810 may be a strip-shaped member shaped like the letter "1." One end of the first body 1810 may be connected to an external power source, and the other end may be welded to the second body 1820. The first body 1810 may be butt-welded to one side of the bent ends of the second body 1820.
[0140] The second body 1820 may be a strip-shaped member with a repeated concave-convex pattern. The second body 1820 includes a curved portion 1821 that forms the body of the bus bar terminal 1800 and an end portion 1822 that is connected to the coil 330. The end portion 1822 may be formed by bending both ends of the curved portion 1821 outward. An end 1822a of the end portion 1822 is bent into a ring shape, and the end portion of the coil 330 is located inside. The second bodies 1820 of the bus bar terminals 1800 arranged in the first group G1 and the second group G2 may all have the same shape and size.
[0141] The first body 1810 may be twisted to be coupled to the second body 1820. This is because the orientation of one end 1811 connected to an external power source and the orientation of the other end 1812 welded to the second body 1820 are different, so the first body 1810 may be twisted to align them.
[0142] The degree of twist of the first body 1810 may be set taking into consideration the degree of difference in the direction of one end 1811 connected to an external power source and the other end 1812 welded to the second body 1820. The first bodies 1810 of the bus bar terminal 1800 may all be twisted to the same degree, but the present invention is not limited thereto, and first bodies 1810 may be disposed with different degrees of twist taking into consideration the direction of one end 1811 of the first body 1810 connected to an external power source and the direction of the other end 1812 welded to the first body 1810. The first body 1810 as described above has no bending region, which allows for the omission of a bending process and has the advantage of enabling the formation of a developed shape of the plate material, which can significantly reduce discarded scrap.
[0143] Meanwhile, the twist directions of the first bodies 1810 of the bus bar terminals 1800 arranged in the first group G1 may be the same as each other. The twist directions of the first bodies 1810 of the bus bar terminals 1800 arranged in the second group G2 may be the same as each other. However, the twist directions of the second bodies 1820 of the bus bar terminals 1800 arranged in the first group G1 and the twist directions of the second bodies 1810 of the bus bar terminals 1800 arranged in the second group G2 may be different from each other.
[0144] FIG. 30 is an exploded view of the bus bar terminal 1800 shown in FIG. 26, illustrating the bus bar terminal 1800 including a first body 1810 in a bent form, and FIG. 31 is a perspective view of the assembled bus bar terminal 1800 of FIG. 30.
[0145] 30 and 31 , some of the plurality of bus bar terminals 1800 may have a bent first body 1810 rather than a twisted first body 1810. Thus, a bus bar terminal 1800 having a twisted first body 1810 may be combined with a bus bar terminal 1800 having a bent first body 1810. The bending direction and number of bending times of the first body 1810 may be determined in consideration of the degree of difference between the orientation of one end 1811 connected to an external power source and the orientation of the other end 1812 welded to the first body 1810.
[0146] 26 to 31, first bus bar terminal 1800A and second bus bar terminal 1800B may have a twisted first body 1810. Fourth bus bar terminal 1800D, fifth bus bar terminal 1800E, and sixth bus bar terminal 1800F may also have a twisted first body 1810. However, third bus bar terminal 1800C may have a bent first body 1810, unlike the other bus bars.
[0147] 26, the busbar terminals 1800 of the first group G1 may be arranged such that the center of curvature CA of the first busbar terminal 1800A, the center of curvature CB of the second busbar terminal 1800B, and the center of curvature CC of the third busbar terminal 1800C are different from one another. However, in order to make the radial positions of the ends 1822a of the ends that contact the coil 330 the same, the second bodies 1820 of the first group G1 may be arranged to appear spiral when viewed from the axial direction of the busbar terminals 1800.
[0148] 27 , with respect to the axial direction of the shaft 500, the end 1822 of the second bus bar terminal 1800B may form an overlap region O1 with the first body 1810 of the first bus bar terminal 1800A. Furthermore, the end 1822 of the third bus bar terminal 1800C may form an overlap region O2 with the second body 1820 of the first bus bar terminal 1800A and the second body 1820 of the second bus bar terminal 1800B. When viewed with respect to the second body 1820 of the second bus bar terminal 1800B, the first bus bar terminal 1800A may be disposed outermost, the third bus bar terminal 1800C may be disposed innermost, and the second bus bar terminal 1800B may be disposed between the first bus bar terminal 1800A and the third bus bar terminal 1800C.
[0149] 26 , the busbar terminals 1800 of the second group G2 may be arranged such that the center of curvature CD of the fourth busbar terminal 1800D, the center of curvature CE of the fifth busbar terminal 1800E, and the center of curvature CF of the sixth busbar terminal 1800F are different from one another. To align the radial positions of the ends 1822a of the ends that contact the coil 330, the second bodies 1820 of the second group G2 may be arranged to appear spiral when viewed in the axial direction of the busbar terminals 1800. The end 1822 of the fifth busbar terminal 1800E may form an overlap region O1 with the first body 1810 of the fourth busbar terminal 1800D based on the axial direction of the shaft 500. Furthermore, end 1822 of sixth bus bar terminal 1800F may form overlapping region O2 with second body 1820 of fourth bus bar terminal 1800D and second body 1820 of fifth bus bar terminal 1800E. When viewed from second body 1820 as a reference, fourth bus bar terminal 1800D may be disposed outermost, sixth bus bar terminal 1800F may be disposed innermost, and fifth bus bar terminal 1800E may be disposed between fourth bus bar terminal 1800D and sixth bus bar terminal 1800F.
[0150] FIG. 32 is a diagram illustrating the plate material forming the second body 1820 of the bus bar terminal 1800 and an exploded view.
[0151] 32, the second body 1820 of the bus bar terminal 1800 is manufactured by pressing the sheet material 10 according to the pattern of the development view. Among the regions of the sheet material 10, a band-shaped region with repeated concave and convex shapes is the first region 11 that forms the second body 1820 of the bus bar terminal 1800, and the remaining region S is the region that is discarded as scrap. Because the first region 11 does not have any branched structures or protruding structures for bending and includes a pattern in which an unfolded shape having a predetermined width is continuously formed, the width L1 of the sheet material 10 can be significantly reduced. This has the advantage of not only reducing the size of the sheet material 10 itself but also significantly reducing the amount of discarded scrap.
[0152] FIG. 33 is a development view of the plate material 20 that forms the first body 1810 of the bus bar terminal 1800. As shown in FIG.
[0153] 33, the plate 20 forming the first body 1810 does not require a separate development pattern and may be the plate 20 itself cut to fit the size of the first body 1810. The width L2 of the plate 20 may be the same as the width of the first body 1810. Therefore, no scrap is discarded when manufacturing the first body 1810.
[0154] FIG. 34 is a plan view of the bus bar terminal 1800, illustrating an enlarged cross-sectional shape of the bus bar terminal 1800.
[0155] 34, the second body 1820 of the bus bar terminal 1800 may be disposed such that its axial width SW is greater than its radial width RW3. That is, the bus bar terminal 1800 may be disposed such that the second body 1820 stands upright. The cross section of one end 1811 of the twisted first body 1810, which is connected to an external power source, may be disposed such that its circumferential width CW1 is greater than its radial width RW1. Conversely, the cross section of the other end 1812 of the twisted first body 1810, which is welded to the first body 1810, may be disposed such that its circumferential width CW2 is smaller than its radial width RW2.
[0156] The third bus bar terminal 1800C has a bent first body 1810. The cross section of one end 1811 of the third bus bar terminal 1800C, which is connected to an external power source, may be spaced apart from the cross section of the other end 1812, which is welded to the first body 1810.
[0157] Although the above-described embodiment has been described using an inner rotor motor as an example, the present invention is not limited to this. The present invention can also be applied to an outer rotor motor. Furthermore, the present invention can be used in a variety of devices, such as vehicles and home appliances. [Explanation of symbols]
[0158] 100: Housing 200:Cover 300: Stator 400:Rotor 500: Shaft 600: Busbar 700: Busbar body 800: Busbar terminal 810: Body 811: Body 812:Terminal section 813, 815: Protrusion 814: Guide 820: Power terminal section 824: Embo 900: Sensor unit 1800A: First bus bar terminal 1800B: 2nd bus terminal 1800C: 3rd bus terminal 1800D: 4th bus terminal 1800E: 5th Bus Bar Terminal 1800F: 6th bus bar terminal 1810: First body 1820: Second body
Claims
1. A shaft and a rotor coupled to the shaft; a stator disposed to correspond to the rotor; the stator includes a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator; a plurality of bus bar terminals electrically connected to the coil and a bus bar holder supporting the bus bar terminals; Each of the plurality of bus bar terminals includes a first body and a second body coupled to the first body, At least some of the bus bar terminals are coupled to the second body by twisting the first body, At least some of the bus bar terminals are arranged such that the centers of curvature of the second body are different from each other.
2. 2. The motor of claim 1, wherein the first body is twisted to be coupled to the second body, and is disposed such that the circumferential width of a cross section at one end is greater than the radial width, and is coupled to the second body such that the circumferential width of a cross section at the other end is smaller than the radial width.
3. The motor of claim 1 , wherein the second body is arranged such that its axial width is greater than its radial width.
4. 2. The motor according to claim 1, wherein the second body is formed of a strip-shaped member having a continuously repeated concave-convex pattern, and the end of the second body connected to the coil is formed by bending both ends of the strip-shaped member.
5. The second bodies of the plurality of bus bar terminals all have the same shape, 2. The motor of claim 1, wherein some of the first bodies of the plurality of bus bar terminals are twisted and coupled to the second body, and other parts of the first bodies of the plurality of bus bar terminals are bent and coupled to the second body.
6. 6. The motor of claim 5, wherein a portion of the bus bar terminal where the first body is bent to be coupled to the second body is positioned to overlap with the bus bar terminal where the first body is twisted to be coupled to the second body based on an axial direction of the shaft.
7. the plurality of bus bar terminals include a first group including a first bus bar terminal, a second bus bar terminal, and a third bus bar terminal, and a second group including a fourth bus bar terminal, a fifth bus bar terminal, and a sixth bus bar terminal; The motor according to claim 1 , wherein the first group and the second group are arranged to be electrically separated from each other.
8. 8. The motor according to claim 7, wherein a twisting direction of the second body of the first group is different from a twisting direction of the second body of the second group, with respect to an axial direction of the shaft.
9. a portion of the second bus bar terminal is disposed to overlap with the first bus bar terminal with respect to an axial direction of the shaft; a portion of the third bus bar terminal is arranged to overlap with the first bus bar terminal and the second bus bar terminal with respect to an axial direction of the shaft; a portion of the fifth bus bar terminal is arranged to overlap with the fourth bus bar terminal with respect to an axial direction of the shaft; The motor according to claim 7 , wherein a portion of the sixth bus bar terminal is arranged to overlap with the fourth bus bar terminal and the fifth bus bar terminal with respect to the axial direction of the shaft.