electric machine

Abstract

Disclosed is an electric motor including a stator, a rotor disposed inside the stator, and a shaft coupled to the rotor, wherein the stator includes a stator core, a coil wound around the stator core, and an insulator disposed between the stator core and the coil, and the insulator includes an upper insulator and a lower insulator. An upper body of the upper insulator includes a first side wall portion, a second side wall portion disposed to be spaced apart from the first side wall portion, and a first cover portion extending from one end of the first side wall portion and connected to one end on one side of the second side wall portion, wherein the number of a plurality of first grooves formed on the first side wall portion is different from the number of a plurality of second grooves formed on the second side wall portion. Accordingly, when a coil having an increased diameter is used, asymmetric wiring of the coil can be achieved by using the insulator for guiding the coil arrangement, thereby improving the performance of the electric motor.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric motor. BACKGROUND

[0002] An electric motor is a device configured to convert electric energy into mechanical energy to obtain rotational force, and is widely used in automobiles, home electronics, and industrial equipment, etc.

[0003] In particular, the electric motor can be used as a vehicle motor in which the electric motor is used in an electronic power steering system or an active roll stabilizer (ARS).

[0004] The electric motor can include a housing, a shaft, a stator disposed on an inner circumferential surface of the housing, a rotor disposed on the shaft, a bus bar disposed on the stator, etc. In this case, the stator causes an electrical interaction with the rotor to cause rotation of the rotor.

[0005] In addition, the bus bar can include a bus bar body and a plurality of terminals disposed on the bus bar body. In this case, one side of the terminal can be connected to a connection end of a coil of the stator, and the other side of the terminal can be connected to an external power source through a cable. In addition, the bus bar body can be referred to as a bus bar holder.

[0006] In this case, the bus bar can be formed by injection molding.

[0007] However, a problem occurs in that a distance between the terminals cannot be maintained due to injection pressure generated in a process of injection molding the bus bar body using a molding part. In addition, such a problem can cause the electric motor to be judged as defective due to a violation of an insulation standard.

[0008] In addition, when the bus bar body is injection molded, a pin of an injection mold is disposed between the terminals to maintain a distance between the terminals. In addition, an injection material can not be introduced to an area in which the pin is disposed, and thus a groove or a hole can be formed according to a shape of the pin. Therefore, there can be a problem in that the injection material, that is, an insulator, is not disposed between the terminals. In addition, a violation of the insulation standard can occur due to a position in which the groove or the hole is formed.

[0009] Therefore, there is a need for a bus bar in which an injection material is disposed between terminals while maintaining a distance between the terminals against injection pressure. SUMMARY

[0010] TECHNICAL PROBLEM

[0011] A busbar that counteracts a decrease in an insulation distance between terminals due to injection pressure generated during injection molding and a motor including the same.

[0012] A busbar that counteracts a decrease in an insulation distance between terminals due to injection pressure generated during injection molding and a motor including the same.

[0013] The problems to be solved by the present application are not limited to the above-mentioned problems, and other problems not mentioned herein will be clearly understood by those skilled in the art through the following description.

[0014] Technical Solution

[0015] An aspect of the present application provides a motor including a stator, a rotor disposed inside the stator, a shaft coupled to the rotor, and a busbar disposed on the stator, wherein the busbar includes a busbar holder and a plurality of terminals disposed on the busbar holder, the plurality of terminals including a first terminal and a second terminal spaced apart from the first terminal, each of the first terminal and the second terminal including a body disposed in the busbar holder and a protrusion extending from the body, the busbar holder including a first region overlapping the protrusion in a radial direction and a groove in which the protrusion of the first terminal is disposed, the first region overlapping the second terminal in an axial direction.

[0016] The groove can be formed in an upper surface of the busbar holder to expose an upper surface of the protrusion of the first terminal.

[0017] The plurality of terminals can include a third terminal disposed to be spaced apart from the first terminal and the second terminal in the radial direction, the third terminal can include a body disposed in the busbar holder and a protrusion extending from the body.

[0018] The protrusion of the third terminal can not overlap the protrusions of the first terminal and the second terminal in the radial direction and a circumferential direction. In addition, the second terminal can be disposed between the first terminal and the third terminal, and a radius (R1) of the first terminal can be smaller than a radius (R2) of the second terminal.

[0019] Another aspect of the present application provides an electric motor including a stator, a rotor disposed within the stator, a shaft coupled to the rotor, and a busbar disposed on the stator, wherein the busbar includes a busbar holder and first and second terminals coupled to the busbar holder, each of the first and second terminals includes a body and a protrusion protruding from the body, the protrusion of the first terminal does not overlap the protrusion of the second terminal in a radial direction, and the protrusion of the first terminal does not overlap the busbar holder in an upward direction and overlaps the busbar holder in a circumferential direction.

[0020] The protrusion of the first terminal can not overlap the protrusion of the second terminal in the radial direction.

[0021] The first and second terminals can be disposed to be spaced apart from each other in the radial direction.

[0022] Still another aspect of the present application provides an electric motor including a stator, a rotor disposed within the stator, a shaft coupled to the rotor, and a busbar disposed on the stator, wherein the busbar includes a busbar holder and a first terminal coupled to the busbar holder, the first terminal includes a body, a protrusion protruding from the body, and a terminal portion spaced apart from the protrusion and extending from the body, the busbar holder includes a groove formed to expose the protrusion of the first terminal, and a portion of the busbar holder is disposed between the protrusion of the first terminal and the terminal portion of the first terminal.

[0023] The terminal portion can be coupled to a coil of the stator, and the protrusion can be disposed between the terminal portions.

[0024] The busbar holder can include a groove through which the protrusion of the first terminal is exposed, and the groove can be concavely formed in an upper surface of the busbar holder.

[0025] The protrusion of the first terminal can be provided as two or more protrusions, and the two or more protrusions of the first terminal can be disposed to be spaced apart from each other. In this case, the two or more protrusions of the first terminal can be disposed to be spaced apart from each other in a circumferential direction.

[0026] An upper surface of the body of the first terminal can be in contact with the busbar holder.

[0027] Advantageous effects

[0028] According to an embodiment, when injection molding a busbar retainer, protrusions formed on the terminals can be used to maintain the radial distance between the first terminal and the second terminal.

[0029] Alternatively, insulation performance between terminals can be ensured by providing a molding portion in the radial direction of the protrusion of the first terminal. In this case, the molding portion can be provided in the axial direction of the second terminal. That is, since the molding portion is provided in the area where the radial direction of the protrusion of the first terminal intersects with the axial direction of the second terminal, insulation and insulation performance between the first and second terminals can be ensured. In this case, the molding portion can also be provided between the body of the first terminal and the body of the second terminal to meet the user's insulation standards.

[0030] The various beneficial advantages and effects of the embodiments are not limited to those described above, and can be more easily understood in the process of describing the specific embodiments. Attached Figure Description

[0031] Figure 1 This is a view showing a motor according to an embodiment;

[0032] Figure 2 This is a perspective view showing the busbar of a motor according to an embodiment;

[0033] Figure 3 This is a top view showing the busbar of a motor according to an embodiment;

[0034] Figure 4 It is along Figure 3 A sectional view taken by line AA;

[0035] Figure 5 It is along Figure 3 A sectional view taken by line BB;

[0036] Figure 6 It is along Figure 3 A cross-sectional view taken by line CC;

[0037] Figure 7 It is along Figure 3 A sectional view taken from line DD;

[0038] Figure 8 This is a perspective view showing the terminals of the busbar disposed in the motor according to the embodiment;

[0039] Figure 9 This is a top view showing the terminals of the busbar provided in the motor according to the embodiment;

[0040] Figure 10 This is a view showing the first terminal of the busbar terminals provided in the motor according to the embodiment;

[0041] Figure 11 is a view showing a second terminal of a terminal of a busbar provided in the motor according to an embodiment;

[0042] Figure 12 is a view showing a third terminal of a terminal of a busbar provided in the motor according to an embodiment;

[0043] Figure 13 is a view showing a neutral terminal of a terminal of a busbar provided in the motor according to an embodiment. DETAILED DESCRIPTION

[0044] Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0045] However, the technical spirit of the present application is not limited to some embodiments described, but can be implemented in various different forms, and within the scope of the technical spirit of the present application, at least one or more components of the embodiments can be selectively combined and used in substitution.

[0046] Further, all terms used herein, including technical and scientific terms, can be interpreted as meanings commonly understood by those of ordinary skill in the art to which the present application pertains, unless specifically defined and explicitly described otherwise. The meanings of the terms commonly used can be interpreted in the context of the related art, for example, the terms previously defined.

[0047] In addition, the terms used in the embodiments of the present application are regarded as descriptive, and are not used to limit the present application.

[0048] In the present specification, unless otherwise stated in the phrase, the singular form can also include the plural form, and in the case of being described as "at least one of A, B, and C (or one or more)", it can include at least one of all possible combinations of A, B, and C.

[0049] In addition, in describing components of the embodiments of the present application, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. can be used.

[0050] These terms are only used to distinguish the components from other components, and do not limit the nature, order, etc. of the elements by the terms.

[0051] In addition, it should be understood that when one element is referred to as being "connected" or "coupled" to another element, such description can include not only the case where the element is directly connected or coupled to the other element, but also the case where the element is connected or coupled to the other element with another element interposed therebetween.

[0052] Further, when any one element is described as being formed or disposed "above" or "below" another element, such a description can include a case where the two components are formed or disposed to be in direct contact with each other, as well as a case where one or more other elements are interposed between the two components. In addition, when one element is described as being formed "above" or "below" another element, such a description can include a case where the one element is formed on the upper side or the lower side with respect to the other element.

[0053] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings, in which the same or corresponding components are given the same reference numerals and repetitive description thereof will be omitted.

[0054] Figure 1 is a view showing a motor according to an embodiment. In Figure 1 , the x-direction can denote an axial direction, and the y-direction can denote a radial direction. Further, the axial direction and the radial direction can be perpendicular to each other. Further, the axial direction can be a longitudinal direction of the shaft 500.

[0055] Referring to Figure 1 , the motor 1 according to an embodiment can include a housing 100 in which an opening is formed at one side, a cover 200 disposed on the housing 100, a stator 300 disposed in the housing 100, a rotor 400 disposed within the stator 300, a shaft 500 that rotates together with the rotor 400, a bus bar 600 disposed on the stator 300, and a sensor portion 700 that detects rotation of the shaft 500. In this case, the term "inward" can denote a direction toward the center C, and the term "outward" can denote a direction opposite to the "inward".

[0056] The housing 100 and the cover 200 can form an outer shape of the motor 1. Further, an accommodation space can be formed by combining the housing 100 and the cover 200. Accordingly, as Figure 1 indicated, the stator 300, the rotor 400, the shaft 500, etc. can be disposed in the accommodation space. In this case, the shaft 500 can be rotatably disposed in the accommodation space. Accordingly, the motor 1 can further include bearings 10 disposed on upper and lower portions of the shaft 500.

[0057] The housing 100 can be formed in a cylindrical shape. Further, the housing 100 can accommodate the stator 300, the rotor 400, etc. therein. In this case, the shape or the material of the housing 100 can be variously changed. For example, the housing 100 can be formed of a metal material capable of well withstanding high temperature.

[0058] The cover 200 can be provided on an open surface of the housing 100, that is, the cover 200 can be provided on the housing 100 to cover an opening of the housing 100. In this case, the shape or material of the cover 200 can be variously transformed. For example, the cover 200 can be formed of a metallic material capable of well withstanding high temperature.

[0059] The stator 300 can be provided inside the housing 100. In this case, the stator 300 can be supported by an inner circumferential surface of the housing 100. Also, the stator 300 can be provided outside the rotor 400. That is, the rotor 400 can be rotatably provided inside the stator 300.

[0060] Reference Figure 1 The stator 300 can include a stator core 310, a coil 320 wound around the stator core 310, and an insulator 330 provided between the stator core 310 and the coil 320.

[0061] The coil 320 generating a rotating magnetic field can be wound around the stator core 310. In this case, the stator core 310 can be formed as one core or can be formed by combining a plurality of divided cores.

[0062] Also, the stator core 310 can be formed in a form in which a plurality of thin plate-shaped plates are stacked, but is not necessarily limited thereto. For example, the stator core 310 can also be formed as one single part.

[0063] The stator core 310 can include a cylindrical yoke (not shown) and a plurality of teeth (not shown) protruding in a radial direction from the yoke. Also, the coil 320 can be wound around the teeth.

[0064] The insulator 330 insulates the stator core 310 from the coil 320. Thus, the insulator 330 can be provided between the stator core 310 and the coil 320.

[0065] Thus, the coil 320 can be wound around the teeth of the stator core 310 on which the insulator 330 is provided.

[0066] The rotor 400 can be provided inside the stator 300. Also, the shaft 500 can be combined to a center portion thereof.

[0067] Also, the rotor 400 can be formed such that the magnet 420 is combined to the rotor core 410. In this case, the rotor 400 can be formed as a surface permanent magnet (SPM) type rotor in which the magnet 420 is provided at an outer side of the rotor core 410.

[0068] The rotor core 410 can be manufactured by combining multiple segmented cores or as a single core comprising a container. Alternatively, the rotor core 410 can be formed as a stack of multiple thin, plate-like sheets. In this case, the sheets can be steel plates.

[0069] The magnet 420 can generate a rotating magnetic field using a coil 320 wound around the stator 300. The magnet 420 can be configured such that the N pole and the S pole are alternately positioned in the circumferential direction about the center of the axis 500.

[0070] Therefore, the rotor 400 rotates due to the electrical interaction between the coil 320 and the magnet 420, and as the rotor 400 rotates, the shaft 500 rotates to generate the driving force of the motor 1.

[0071] like Figure 1 As shown, the shaft 500 can be disposed in the housing 100 and rotatably supported by the bearing 10. Furthermore, the shaft 500 can rotate together with the rotor 400 in conjunction with the rotation of the rotor 400.

[0072] Busbar 600 can be installed on stator 300.

[0073] Busbar 600 can be electrically connected to coil 320 of stator 300. Therefore, power applied from the outside can be transmitted to coil 320 through busbar 600.

[0074] Figure 2 This is a perspective view showing the busbar of a motor according to an embodiment. Figure 3 This is a top view showing the busbar of a motor according to an embodiment. Figure 4 It is along Figure 3 The sectional view taken by line AA. Figure 5 It is along Figure 3 The sectional view taken by line BB. Figure 6 It is along Figure 3 The cross-sectional view taken by line CC. Figure 7 It is along Figure 3 The sectional view taken by line DD. Figure 8 This is a perspective view showing the terminals of the busbar disposed in the motor according to the embodiment. Figure 9 This is a top view showing the terminals of the busbar provided in the motor according to the embodiment. Figure 10 This is a view showing the first terminal of the busbar terminals disposed in the motor according to the embodiment. Figure 11 This is a view showing the second terminal of the busbar terminals provided in the motor according to the embodiment. Figure 12 This is a view showing the third terminal of the busbar terminals provided in the motor according to the embodiment.

[0075] refer toFigures 2 to 12 The busbar 600 can include a busbar holder 610 and a plurality of terminals 620 disposed on the busbar holder. In this case, the busbar holder 610 can be referred to as a busbar body.

[0076] The busbar holder 610 can be formed of a resin material such as synthetic resin. Also, the busbar holder 610 can be formed by an injection molding method. For example, the busbar 600 can be formed by a method of injecting a molding portion into the plurality of terminals 620 to form the busbar holder 610.

[0077] That is, the busbar holder 610 can be a molding portion formed by an injection molding method using an insulating material. Also, when the busbar holder 610 is injection molded, since the molding portion is filled between the terminals 620, it is possible to secure an insulation performance.

[0078] Meanwhile, the busbar holder 610 can include a groove 612 formed in the upper surface 611. As shown in FIG. 6B, the groove 612 can be recessed in the upper surface 611 in the axial direction. Figure 2

[0079] Also, the protrusion of the terminal 620 can be disposed in the groove 612. For example, the groove 612 can be formed in the upper surface 611 of the busbar holder 610 such that the upper surface of the protrusion is exposed.

[0080] Therefore, since the molding portion forming the busbar holder 610 is disposed in a region in which the protrusion of one of the plurality of terminals 620 overlaps in the radial direction, it is possible to improve the insulation performance between the terminals 620 of the busbar holder 610.

[0081] For example, since the molding portion is disposed in the radial direction of the groove 612 in which the protrusion of one of the plurality of terminals 620 is disposed, and the molding portion is disposed in the axial direction of the other terminal, it is possible to improve the insulation performance between the terminals 620 of the busbar holder 610. That is, since the molding portion is disposed in a region in which the radial direction of the groove 612 in which the protrusion of one of the plurality of terminals 620 is disposed intersects the axial direction of the other terminal, the terminals 620 of the busbar holder 610 can be insulated from each other. In this case, a portion of the busbar holder 610 overlapping the protrusion in the radial direction can be referred to as a first region A1.

[0082] In addition, since a pin (not shown) disposed as a mold forming the busbar 600 guides the protrusion to be located at a predetermined position, it is possible to maintain an insulation distance between the terminals 620 required by a user. Therefore, since the insulation distance between the terminals 620 is maintained in the radial direction by the pin, as shown in FIG. 6B, the busbar holder 610 can be formed to have a predetermined shape.​Figure 7 As shown, the molded portion is disposed between the plurality of terminals 620 in the radial direction. In this case, a portion of the busbar holder 610 that maintains the insulation distance in the radial direction between the terminals 620 can be referred to as a second region A2.

[0083] Meanwhile, the busbar holder 610 can be formed in a ring shape in which a hole is formed to pass through a central portion thereof.

[0084] The terminals 620 can be electrically connected to the coils 320 of the stator 300. In this case, the terminals 620 can be disposed on the busbar holder 610 such that a portion of the terminals 620 is exposed from the busbar holder 610 and electrically connected to the coils 320. In this case, the terminals 620 can be formed of a metal material.

[0085] Reference Figures 4 to 12 The plurality of terminals 620 can include a first terminal 621, a second terminal 622, and a third terminal 623. In addition, the terminals 620 can include a power terminal 624 connected to an external power source of a U-phase, a V-phase, and a W-phase, and a neutral terminal 625.

[0086] In order to secure stability of the motor 1, the first terminal 621, the second terminal 622, the third terminal 623, the power terminal 624, and the neutral terminal 625 can constitute at least two groups that are electrically connected to each other. In this case, two coils 320 can also be provided such that the coils 320 of the stator 300 are electrically connected to the two groups corresponding thereto.

[0087] Accordingly, the first terminal 621, the second terminal 622, the third terminal 623, the power terminal 624, and the neutral terminal 625 constituting one group can be used such that the motor 1 is implemented as a three-phase motor divided into a U-phase, a V-phase, and a W-phase. In this case, two groups of terminals can be electrically separated. In addition, the two groups can be spatially or physically separated on the busbar holder 610. Accordingly, when an abnormality occurs in a circuit connected to any one group or an element connected to the circuit, the motor 1 can be driven by the other group of terminals.

[0088] The first terminal 621, the second terminal 622, and the third terminal 623 can be disposed to be spaced apart from each other. In addition, a portion of the busbar holder 610 can be disposed between the first terminal 621, the second terminal 622, and the third terminal 623 to insulate the terminals 621, 622, and 623 from each other.

[0089] For example, terminal 620 may include a first terminal 621 and a second terminal 622 spaced apart from the first terminal 621. Furthermore, terminal 620 may include a third terminal 623, which is radially spaced outward from the first terminal 621 and the second terminal 622. Moreover, since a portion of busbar holder 610 is disposed between the first terminal 621, the second terminal 622, and the third terminal 623, the first terminal 621, the second terminal 622, and the third terminal 623 can be insulated from each other.

[0090] Meanwhile, the first terminal 621, the second terminal 622, and the third terminal 623 may each include: bodies 621a, 622a, and 623a; protrusions 621b, 622b, and 623b extending axially from one surface of the upper surface, i.e., one surface of the bodies 621a, 622a, and 623a; and terminal portions 621c, 622c, and 623c extending from the bodies 621a, 622a, and 623a and electrically connected to the end of the coil 320.

[0091] like Figure 10 As shown, the first terminal 621 may include: a body 621a; a protrusion 621b extending axially from the upper surface, i.e., one surface of the body 621a; and a terminal portion 621c extending from the body 621a and electrically connected to the end of the coil 320. In this case, the body 621a of the first terminal 621 may be referred to as the first body, the protrusion 621b of the first terminal 621 may be referred to as the first protrusion, and the terminal portion 621c of the first terminal 621 may be referred to as the first terminal portion.

[0092] like Figure 11 As shown, the second terminal 622 may include: a body 622a; a protrusion 622b extending axially from the upper surface, i.e., one surface of the body 622a; and a terminal portion 622c extending from the body 622a and electrically connected to the end of the coil 320. In this case, the body 622a of the second terminal 622 may be referred to as the second body, the protrusion 622b of the second terminal 622 may be referred to as the second protrusion, and the terminal portion 623c of the second terminal 622 may be referred to as the second terminal portion.

[0093] refer to Figure 12The third terminal 623 can include a body 623a, a protrusion 623b extending from an upper surface, that is, one surface of the body 623a, in the axial direction, and a terminal portion 623c extending from the body 623a and electrically connected to the end portion of the coil 320. In this case, the body 623a of the third terminal 623 can be referred to as a third body, the protrusion 623b of the third terminal 623 can be referred to as a third protrusion, and the third terminal 623 can be referred to as a third terminal portion. In addition, the upper surface can be a surface facing the cover 200 or a surface disposed to face the cover 200.

[0094] The bodies 621a, 622a, and 623a of the first terminal 621, the second terminal 622, and the third terminal 623 can be disposed to be spaced apart from each other in the radial direction.

[0095] Referring to Figure 7 and Figure 9 The bodies 621a, 622a, and 623a of the first terminal 621, the second terminal 622, and the third terminal 623 can be spaced apart from each other in the radial direction in order with respect to the center C. The bodies 621a, 622a, and 623a of the first terminal 621, the second terminal 622, and the third terminal 623 can each be formed in an arc shape when viewed in the axial direction. In addition, the upper surfaces of the bodies 621a, 622a, and 623a of the first terminal 621, the second terminal 622, and the third terminal 623 can be in contact with the bus bar holder 610.

[0096] As shown in Figure 9 , a radius R1 of the body 621a of the first terminal 621 can be smaller than a radius R2 of the body 622a of the second terminal 622 based on the center C. In addition, the radius R2 of the body 622a of the second terminal 622 can be smaller than a radius R3 of the body 623a of the third terminal 623. Accordingly, the body 622a of the second terminal 622 can be disposed between the body 621a of the first terminal 621 and the body 623a of the third terminal 623 in the radial direction. In this case, the radius R1 of the body 621a of the first terminal 621 can be referred to as a first radius, and can be a radius in the radial direction from the center C to the first terminal 621. In addition, the radius R2 of the body 622a of the second terminal 622 can be referred to as a second radius, and can be a radius in the radial direction from the center C to the second terminal 622. In addition, the radius R3 of the body 623a of the third terminal 623 can be referred to as a third radius, and can be a radius in the radial direction from the center C to the third terminal 623.

[0097] Accordingly, a second region A2, which is a part of the bus bar holder 610, can be disposed between the bodies 621a, 622a, and 623a of the first terminal 621, the second terminal 622, and the third terminal 623 to maintain an insulation distance (seeFigures 4 to 7 In this case, the insulation distance can be maintained by the protrusions 621b, 622b, and 623b, the positions of which are guided by the pin. In this case, the insulation distance can be a distance between the bodies 621a, 622a, and 623a, which are spaced apart from each other by the second region A2.

[0098] Further, as Figure 7 indicated, a portion of the bus bar holder 610 can also be provided on the bodies 621a, 622a, and 623a.

[0099] The protrusions 621b, 622b, and 623b of the first terminal 621, the second terminal 622, and the third terminal 623 can be formed to protrude in the axial direction from the upper surfaces of the bodies 621a, 622a, and 623a, respectively.

[0100] Further, the plurality of protrusions 621b, 622b, and 623b can be provided to be spaced apart from each other in the circumferential direction, respectively. In detail, two or more of the protrusions 621b, 622b, and 623b can be provided to be spaced apart from each other in the circumferential direction. Thus, even when the injection pressure is applied to the bodies 621a, 622a, and 623a, two of the protrusions 621b, 622b, and 623b can be used instead of one of the protrusions 621b, 622b, and 623b to easily cope with the injection pressure, and thus the bus bar 600 can maintain the insulation distance.

[0101] As Figure 10 indicated, at least two protrusions 621b of the first terminal 621 can be provided on the body 621a to be spaced apart from each other in the circumferential direction. That is, the protrusions 621b of the first terminal 621 can be two or more.

[0102] Referring to Figure 11 , at least two protrusions 622b of the second terminal 622 can be provided on the body 622a to be spaced apart from each other in the circumferential direction. That is, the number of the protrusions 622b of the second terminal 622 can be two or more.

[0103] Referring to Figure 12 , at least two protrusions 623b of the third terminal 623 can be provided on the body 623a to be spaced apart from each other in the circumferential direction. That is, the number of the protrusions 623b of the third terminal 623 can be two or more.

[0104] Also, the protrusions 621b, 622b, and 623b can be disposed not to overlap each other in the radial direction. That is, each of the protrusions 621b, 622b, and 623b can be disposed at a different radius based on the center C. For example, the protrusion 621b of the first terminal 621 can be disposed on an imaginary first line L1, the protrusion 622b of the second terminal 622 can be disposed on an imaginary second line L2, and the protrusion 623b of the third terminal 623 can be disposed on an imaginary third line L3. In this case, the first line L1 can be an imaginary line connecting the center C and the center of the protrusion 621b of the first terminal 621 in the radial direction, and the second line L2 can be an imaginary line connecting the center C and the center of the protrusion 622b of the second terminal 622 in the radial direction, and the third line L3 can be an imaginary line connecting the center C and the center of the protrusion 623b of the third terminal 623 in the radial direction. In this case, the first line L1, the second line L2, and the third line L3 can extend in different directions in the radial direction from the center C.

[0105] Accordingly, the protrusion 621b of the first terminal 621 is disposed not to overlap the protrusions 622b and 623b of the second and third terminals 622 and 623 in the radial direction and the circumferential direction. That is, only the protrusion 621b of the first terminal 621 is disposed on the first line L1, and the protrusions 622b and 623b of the second and third terminals 622 and 623 can be disposed to be spaced apart from the first line L1 in the radial direction. Also, the protrusion 622b of the second terminal 622 is disposed not to overlap the protrusions 621b and 623b of the first and third terminals 621 and 623 in the radial direction and the circumferential direction. That is, only the protrusion 622b of the second terminal 622 can be disposed on the second line L2, and the protrusions 621b and 623b of the first and third terminals 621 and 623 can be disposed to be spaced apart from the second line L2 in the radial direction. Also, the protrusion 623b of the third terminal 623 is disposed not to overlap the protrusions 621b and 622b of the first and second terminals 621 and 622 in the radial direction and the circumferential direction. That is, only the protrusion 623b of the third terminal 623 can be disposed on the third line L3, and the protrusions 621b and 622b of the first and second terminals 621 and 622 can be disposed to be spaced apart from the third line L3 in the radial direction.

[0106] Also, the protrusions 621b, 622b, and 623b can be disposed in the grooves 612. In this case, the protrusions 621b, 622b, and 623b can be disposed in the grooves 612 of the bus bar holder 610 to expose the upper surfaces of the protrusions 621b, 622b, and 623b.

[0107] For example, the upper surface of the protrusion 621b of the first terminal 621 can be exposedly disposed in any one of the plurality of grooves 612, the upper surface of the protrusion 622b of the second terminal 622 can be exposedly disposed in another one of the plurality of grooves 612, and the upper surface of the protrusion 623b of the third terminal 623 can be exposedly disposed in still another one of the plurality of grooves 612.

[0108] Therefore, due to the grooves 612, a portion of the bus bar holder 610 is not disposed on the protrusion 621b of the first terminal 621. However, a portion of the bus bar holder 610 can be disposed to overlap the protrusion 621b of the first terminal 621 in the circumferential direction. Therefore, a portion of the bus bar holder 610 can be disposed on and overlap the body 621a of the first terminal 621 formed in an arc shape in the circumferential direction. That is, the protrusion 621b of the first terminal 621 can not overlap the bus bar holder 610 in the upward direction, and can overlap the bus bar holder 610 in the circumferential direction.

[0109] Further, due to the grooves 612, a portion of the bus bar holder 610 is not disposed on the protrusion 622b of the second terminal 622. However, a portion of the bus bar holder 610 can be disposed to overlap the protrusion 622b of the second terminal 622 in the circumferential direction. Therefore, a portion of the bus bar holder 610 can be disposed on and overlap the body 622a of the second terminal 622 formed in an arc shape in the circumferential direction.

[0110] Further, due to the grooves 612, a portion of the bus bar holder 610 is not disposed on the protrusion 623b of the third terminal 623. However, a portion of the bus bar holder 610 can be disposed to overlap the protrusion 623b of the third terminal 623 in the circumferential direction. Therefore, a portion of the bus bar holder 610 can be disposed on and overlap the body 623a of the third terminal 623 formed in an arc shape in the circumferential direction.

[0111] Meanwhile, the first region A1, which is a portion of the bus bar holder 610, can be disposed to overlap the protrusions 621b, 622b, and 623b in the radial direction. For example, although the protrusions 621b, 622b, and 623b are exposedly disposed in the grooves 612, a portion of the bus bar holder 610 is disposed on the protrusions 621b, 622b, and 623b spaced apart from each other in the radial direction, thereby constituting the first region A1.

[0112] As Figure 4As shown, the 1-1 region A1-1 of the first region A1 of the bus bar holder 610 can be disposed to overlap the protrusion 621b of the first terminal 621 in the radial direction. In this case, the 1-1 region A1-1 can be disposed on the body 622a of the second terminal 622 and the body 623a of the third terminal 623.

[0113] As shown, the 1-2 region A1-2 of the first region A1 of the bus bar holder 610 can be disposed to overlap the protrusion 622b of the second terminal 622 in the radial direction. In this case, the 1-2 region A1-2 can be disposed on the body 621a of the first terminal 621 and the body 623a of the third terminal 623. Figure 5 As shown, the 1-3 region A1-3 of the first region A1 of the bus bar holder 610 can be disposed to overlap the protrusion 623b of the third terminal 623 in the radial direction. In this case, the 1-3 region A1-3 can be disposed on the body 621a of the first terminal 621 and the body 622a of the second terminal 622.

[0114] Figure 6

[0115] The terminal portions 621c, 622c, and 623c can be formed to protrude from the bodies 621a, 622a, and 623a in the radial direction. In this case, end portions of the terminal portions 621c, 622c, and 623c can be bent to be electrically connected to the coil 320. In this case, the terminal portions 621c, 622c, and 623c can be referred to as bent portions or hook portions due to their shapes.

[0116] Further, the plurality of terminal portions 621c, 622c, and 623c can be disposed on the bodies 621a, 622a, and 623a, respectively, at intervals in the circumferential direction. In this case, the protrusions 621b, 622b, and 623b can be disposed on the bodies 621a, 622a, and 623a, respectively, between the terminal portions 621c, 622c, and 623c in the circumferential direction. Further, a portion of the bus bar holder 610 can be disposed between the terminal portions 621c, 622c, and 623c and the protrusions 621b, 622b, and 623b.

[0117] Referring to Figures 8 to 10 , the terminal portion 621c of the first terminal 621 can be formed to protrude from both end portions of the body 621a in the radial direction. In this case, the terminal portion 621c of the first terminal 621 can be disposed to be exposed from the bus bar holder 610.

[0118] Referring to Figure 8 , Figure 9 , and Figure 11 ​​The terminal portion 622c of the second terminal 622 can be formed to protrude in the radial direction from both end portions of the body 622a. In this case, the terminal portion 622c of the second terminal 622 can be provided to be exposed from the bus bar holder 610.

[0119] Referring to Figure 8 , Figure 9 and Figure 12 The terminal portion 623c of the third terminal 623 can be formed to protrude in the radial direction from both end portions of the body 623a. In this case, the terminal portion 623c of the third terminal 623 can be provided to be exposed from the bus bar holder 610.

[0120] The power terminal 624 can be provided on the bus bar holder 610 to transmit power externally applied to the coil 320. Accordingly, one side of the power terminal 624 can be connected to an external power source through a cable (not shown), and the other side of the power terminal 624 can be electrically connected to the coil 320. In this case, the other side of the power terminal 624 can be formed in the same shape as the shapes of the terminal portions 621c, 622c, and 623c.

[0121] Further, the power terminal 624 can be disposed above the first terminal 621, the second terminal 622, and the third terminal 623 in the axial direction.

[0122] The neutral terminal 625 can be electrically connected to the coil 320.

[0123] Figure 13 is a view illustrating a neutral terminal among terminals of a bus bar provided in a motor according to an embodiment.

[0124] Referring to Figure 13 , the neutral terminal 625 can include a body 625a and a terminal portion 625c extending from the body 625a and electrically connected to an end portion of the coil 320. In this case, the terminal portion 625c of the neutral terminal 625 can be formed in the same shape as the shapes of the terminal portions 621c, 622c, and 623c.

[0125] Further, the neutral terminal 625 can be disposed outside the first terminal 621, the second terminal 622, and the third terminal 623 in the radial direction.

[0126] Referring to Figure 9 , the body 625a of the neutral terminal 625 can be formed to have a predetermined radius R4 based on the center C, and the radius R4 can be referred to as a fourth radius. In this case, the fourth radius can be a radius from the center C to the neutral terminal 625 in the radial direction. Further, the radius R4 of the body 625a of the neutral terminal 625 can be greater than the radius R3 of the body 623a of the third terminal 623.

[0127] In addition, a plurality of terminal portions 625c can be provided on the body 625a at intervals in the circumferential direction from each other.

[0128] Meanwhile, an example of a neutral terminal 625, which is different from the above in that a protrusion is not formed on the first terminal 621, the second terminal 622, and the third terminal 623, has been described, but the present application is not limited thereto. For example, a protrusion can also be formed on the neutral terminal 625 as with the first terminal 621, the second terminal 622, and the third terminal 623.

[0129] The sensor portion 700 can detect the rotation of the shaft 500 by detecting the magnetic force of a sensing magnet mounted to rotate in conjunction with the rotor 400, thereby detecting the current position of the rotor 400.

[0130] The sensor portion 700 can include a sensing magnet assembly 710 and a printed circuit board (PCB) 720.

[0131] The sensing magnet assembly 710 is coupled to the shaft 500 to detect the position of the rotor 400 in conjunction with the rotation of the rotor 400. In this case, the sensing magnet assembly 710 can include a sensing magnet and a sensing plate. The sensing magnet and the sensing plate can be coaxially coupled.

[0132] The sensing magnet can include a main magnet disposed in the circumferential direction adjacent to a hole forming an inner circumferential surface thereof, and a sub magnet formed at an edge thereof.

[0133] The main magnet can be arranged in the same manner as the magnet 420 of the rotor 400 of the motor.

[0134] The sub magnet can be further divided than the main magnet, such that the sub magnet can be formed to have a number of poles greater than that of the main magnet. Accordingly, the rotation angle of the rotor 400 can be more accurately divided and measured, and thus the motor 1 can be more smoothly driven.

[0135] The sensing plate can be formed of a disc-type metal material. In addition, the sensing magnet can be coupled to an upper surface of the sensing plate. In addition, the sensing plate can be coupled to the shaft 500. In this case, a hole through which the shaft 500 passes can be formed in the sensing plate.

[0136] A sensor that detects the magnetic force of the sensing magnet can be provided on the PCB 720. In this case, the sensor can be provided as a Hall integrated circuit (IC). In addition, the sensor can detect the change of the N pole and the S pole of the sensing magnet and generate a sensing signal.

[0137] While the above has been described with reference to the preferred embodiments of the present application, those skilled in the art can make various modifications and changes thereto without departing from the spirit and scope of the present application as defined by the appended claims.

[0138] Explanation of reference signs

[0139] 1: motor, 100: housing, 200: cover, 240: hole, 300: stator, 310: stator core, 320: coil, 330: insulator, 400: rotor, 500: shaft, 600: bus bar, 610: bus bar holder, 612: groove, 620: terminal, 621: first terminal, 622: second terminal, 623: third terminal, 621b, 622b, 623b: protrusion, 700: sensor portion.

Claims

1. An electric motor comprising: a stator; a rotor disposed inside the stator; a shaft coupled to the rotor; and a bus bar disposed on the stator, wherein the bus bar includes a bus bar holder and a plurality of terminals disposed on the bus bar holder, wherein the plurality of terminals includes a first terminal, a second terminal, a third terminal, and a power terminal disposed spaced apart from each other, wherein a side of the power terminal protruding from the bus bar holder is connected to an external power source, wherein each of the first terminal and the second terminal includes a body disposed in the bus bar holder and a protrusion extending from the body, wherein the bus bar holder includes a first area overlapping the protrusion in a radial direction and a groove, wherein the protrusion of the first terminal is disposed in the groove, wherein the first area overlaps the second terminal in an axial direction, and wherein the power terminal is disposed above the first terminal, the second terminal, and the third terminal in the axial direction. The groove is formed in an upper surface of the bus bar holder to expose an upper surface of the protrusion of the first terminal.

2. The electric machine of claim 1, wherein, 3.The electric motor of claim 1, wherein: the plurality of terminals includes the third terminal disposed spaced apart from the first terminal and the second terminal in the radial direction; and the third terminal includes a body disposed in the bus bar holder and a protrusion extending from the body. The protrusion of the third terminal does not overlap the protrusions of the first terminal and the second terminal in the radial direction and a circumferential direction.

4. The electric machine of claim 3, wherein, 5.The electric motor of claim 3, wherein: the second terminal is disposed between the first terminal and the third terminal; and a radius (R1) of the first terminal is smaller than a radius (R2) of the second terminal. 6.An electric motor comprising: a stator; a rotor disposed inside the stator; a shaft coupled to the rotor; and a bus bar disposed on the stator, wherein the bus bar includes a bus bar holder and a plurality of terminals coupled to the bus bar holder, wherein the plurality of terminals includes a first terminal, a second terminal, a third terminal, and a power terminal disposed spaced apart from each other, wherein a side of the power terminal protruding from the bus bar holder is connected to an external power source, wherein each of the first terminal and the second terminal includes a body and a protrusion protruding from the body, wherein the protrusion of the first terminal does not overlap the protrusion of the second terminal in a radial direction, wherein the protrusion of the first terminal does not overlap the bus bar holder in an upward direction and overlaps the bus bar holder in a circumferential direction, and wherein the power terminal is disposed above the first terminal, the second terminal, and the third terminal in an axial direction. The protrusion of the first terminal does not overlap the protrusion of the second terminal in the radial direction. ​ 7. The electric machine of claim 1 or 6, wherein, ​ 8. The electric machine of claim 1 or 6, wherein, The first terminal and the second terminal are disposed apart from each other in the radial direction.

9. An electric motor comprising: a stator; a rotor disposed inside the stator; a shaft coupled to the rotor; and a bus bar disposed on the stator, wherein the bus bar includes a bus bar holder and a plurality of terminals coupled to the bus bar holder, wherein the plurality of terminals include a first terminal, a second terminal, a third terminal, and a power terminal disposed apart from each other, wherein a side of the power terminal protruding from the bus bar holder is connected to an external power source, wherein the first terminal includes a body, a protrusion protruding from the body, and a terminal portion spaced apart from the protrusion and extending from the body, wherein the bus bar holder includes a groove formed to expose the protrusion of the first terminal, and wherein a portion of the bus bar holder is disposed between the protrusion of the first terminal and the terminal portion of the first terminal, and wherein the power terminal is disposed above the first terminal, the second terminal, and the third terminal in an axial direction.

10. The electric motor of claim 9, wherein: the terminal portion is coupled to a coil of the stator; and the protrusion is disposed between the terminal portions.

11. The electric motor of claim 6 or 9, wherein: the bus bar holder includes a groove through which the protrusion of the first terminal is exposed; and the groove is recessed in an upper surface of the bus bar holder.

12. The electric motor of any one of claims 1, 6, and 9, wherein: the protrusion of the first terminal is disposed as two or more protrusions; and the two or more protrusions of the first terminal are disposed apart from each other. the two or more protrusions of the first terminal are disposed apart from each other in a circumferential direction.

13. The electric machine of claim 12, wherein, an upper surface of the body of the first terminal is in contact with the bus bar holder.

14. The electric machine of any one of claims 1, 6, and 9, wherein, ​

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