Busbar and motor having the same

Abstract

An embodiment discloses a motor comprising: a stator; a rotor disposed corresponding to the stator; a shaft coupled to the rotor; and a busbar disposed above the stator, wherein the busbar comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals disposed on the busbar body, wherein the busbar terminals comprise a body and a power terminal coupled to the body, and the power terminal coupled to a portion of the body exposed through the grooves. Accordingly, the motor can actively respond to an external power source without separate design changes by varying the position of the power terminal connected to the external power source using a busbar terminal implemented through the combination of two members.

Description

Technology Field

[0001] The embodiment relates to a busbar and a motor including the same. Background Technology

[0002] A motor is a device that converts electrical energy into mechanical energy to generate rotational force, and it is widely used in vehicles, household electronics, industrial equipment, and more.

[0003] The motor may include a housing, a shaft, a stator disposed on the inner circumference of the housing, a rotor installed on the outer circumference of the shaft, and a bus bar disposed on the upper part of the stator. Here, the stator induces electrical interaction with the rotor to induce rotation of the rotor.

[0004] Here, the busbar may include a busbar terminal that is coupled to the end of a coil placed in the stator.

[0005] Figure 1 is a drawing showing a conventional busbar terminal formed on a plate for cutting.

[0006] Referring to FIG. 1, a conventional busbar terminal can be formed by cutting a plate (10) to form a primary material that has undergone primary processing, and then forming the busbar terminal as a finished product by using a forming method that bends the primary material. However, the conventional busbar terminal has a problem in that a large amount of scrap is generated during the forming process of cutting a plate (10).

[0007] In addition, a connector for applying external power can be coupled to one side of a conventional busbar terminal. Here, since the busbar terminal is formed by cutting and bending a single sheet of material, it can be formed to have a single shape. Accordingly, there is a problem in that the coupling position of the connector is limited.

[0008] Accordingly, there is a demand for a busbar terminal that can flexibly change the position of the power terminal section while minimizing the aforementioned scrap. The problem to be solved

[0009] An embodiment provides a busbar capable of varying the position of a power terminal connected to an external power source using a busbar terminal implemented through the combination of two members, and a motor including the same.

[0010] The embodiment provides a busbar that minimizes scrap generation by utilizing a busbar terminal implemented through the combination of two members, and a motor including the same.

[0011] The problems that the embodiments aim to solve are not limited to those mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0012] The above problem is achieved by a motor comprising: a stator; a rotor positioned to correspond to the stator; a shaft coupled to the rotor; and a busbar positioned above the stator, wherein the busbar comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals positioned on the busbar body, wherein the busbar terminal comprises a body and a power terminal coupled to the body, and the power terminal coupled to a portion of the body exposed through the grooves.

[0013] Here, the plurality of busbar terminals includes a first busbar terminal, a second busbar terminal, and a third busbar terminal arranged along the radial direction, and the difference between the radius (R3) of the outer surface of the third busbar terminal and the radius (R1) of the inner surface of the first busbar terminal may be smaller than the radial width (W1) of the groove.

[0014] The above problem comprises a stator; a rotor positioned to correspond to the stator; a shaft coupled to the rotor; and a busbar positioned above the stator, wherein the busbar comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals disposed on the busbar body, wherein the busbar terminal comprises a body and a power terminal coupled to the body, wherein the body comprises an arc-shaped body portion having a predetermined curvature, a plurality of terminal portions disposed on the body portion, and a protrusion protruding axially from the upper surface of the body, and the power terminal comprises a power terminal body and at least two first protrusions protruding spaced apart from each other from the lower surface of the power terminal body, wherein the protrusions are coupled between the first protrusions, and the curvature of the body portion and the curvature of the protrusions are the same with respect to the center, and is achieved by a motor.

[0015] Here, the width (W2) of the protrusion based on the circumferential direction may be larger than the width (W3) of the projection.

[0016] Additionally, the body includes at least two second protrusions protruding axially from the upper surface of the protrusion, and the power terminal body is coupled between the second protrusions, and the contact surface of the second protrusion in contact with the power terminal body may be a plane formed parallel to a virtual line (L1) connecting the center (C) and the center (C1) of the protrusion.

[0017] The above problem comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals disposed on the busbar body, wherein the busbar terminals include a body and a power terminal coupled to the body, wherein the body includes an arc-shaped body portion having a predetermined curvature, a plurality of terminal portions disposed on the body portion, and a protrusion protruding axially from the upper surface of the body, and the power terminal includes a first groove formed axially concavely at a lower end, and the power terminal is coupled to the protrusion through the first groove, and the curvature of the body portion and the curvature of the protrusion are the same with respect to the center, and is achieved by a busbar. Effects of the invention

[0018] The embodiment utilizes a busbar terminal implemented through the combination of two members to vary the position of the power terminal connected to the external power source, thereby enabling active response to the external power source without separate design changes.

[0019] In addition, the generation of scrap can be minimized by using a busbar terminal implemented through the combination of two components.

[0020] The various and beneficial advantages and effects of the embodiments are not limited to those described above and may be more easily understood in the process of explaining specific embodiments. Brief explanation of the drawing

[0021] FIG. 1 is a drawing showing a conventional busbar terminal formed on a plate for cutting, and FIG. 2 is a drawing showing a motor according to an embodiment, and FIG. 3 is a cross-sectional view showing line AA of FIG. 2, and FIG. 4 is a perspective view showing a busbar of a motor according to an embodiment, and FIG. 5 is a diagram showing the coupling relationship of power terminals of a busbar disposed on a motor according to an embodiment, and FIG. 6 is a plan view showing a busbar according to an embodiment, and FIG. 7 is a plan view showing a plurality of power terminals arranged on a busbar according to an embodiment, and FIG. 8 is a perspective view showing one of a plurality of busbar terminals arranged on a busbar according to an embodiment, and FIG. 9 is an exploded perspective view showing one of a plurality of busbar terminals arranged on a busbar according to an embodiment, and FIG. 10 is a front view showing one of a plurality of busbar terminals disposed on a busbar according to an embodiment, and FIG. 11 is a cross-sectional view showing line BB of FIG. 10, and FIG. 12 is a drawing showing a busbar terminal according to an embodiment formed for cutting on a single plate, and FIG. 13 is a perspective view showing the body of a busbar terminal disposed on a busbar according to an embodiment, and FIG. 14 is a plan view showing the body of a busbar terminal disposed on a busbar according to an embodiment, and FIG. 15 is a front view showing the body of a busbar terminal disposed on a busbar according to an embodiment, and FIG. 16 is a drawing showing a power terminal disposed on a busbar according to an embodiment, and FIG. 17 is a drawing showing a modified example of a power terminal placed on a busbar according to an embodiment. Specific details for implementing the invention

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0023] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0024] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0025] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0026] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0027] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0028] Hereinafter, embodiments will be described in detail with reference to the attached drawings, provided that identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0029] FIG. 2 is a drawing showing a motor according to an embodiment, and FIG. 3 is a cross-sectional view showing a motor according to an embodiment. Here, FIG. 3 is a cross-sectional view showing line AA of FIG. 2. Also, in FIG. 2, the x direction may mean the radial direction, and the y direction may mean the axial direction. Also, the axial direction and the radial direction may be perpendicular to each other. Here, the axial direction may be the longitudinal direction of the shaft (500).

[0030] Referring to FIGS. 2 and 3, a motor according to an embodiment may include a housing (100) having an opening formed on one side, a cover (200) disposed on the upper side of the housing (100), a stator (300) disposed inside the housing (100), a rotor (400) disposed inside the stator (300), a shaft (500) coupled to the rotor (400), a bus bar (600) disposed on the upper side of the stator (300), and a sensor unit (900) for detecting the rotation of the rotor (400). In addition, the bus bar (600) may include a bus bar body (700) and a plurality of bus bar terminals (800) disposed on the bus bar body (700). Here, the term "inner side" refers to a direction disposed toward the rotation center (C) of the motor with respect to the radial direction, and the term "outer side" may refer to a direction opposite to the inner side.

[0031] Since the busbar terminal (800) placed on the motor can be implemented through the combination of two components, the position of the power terminal (820) connected to the external power source can be freely changed while minimizing the generation of scrap.

[0032] Accordingly, the motor enables active response in terms of motor design by implementing a busbar that can vary the position where power is applied without changing the shape of the busbar terminal (800) according to the customer's requirements.

[0033] The housing (100) and the cover (200) can form the external shape of the motor. Additionally, an internal receiving space can be formed by combining the housing (100) and the cover (200). Accordingly, a stator (300), a rotor (400), a shaft (500), a bus bar (600), a sensor unit (900), etc., can be arranged in the receiving space.

[0034] At this time, the shaft (500) is rotatably positioned in the receiving space. Accordingly, the motor may further include bearings (B) positioned at the upper and lower portions of the shaft (500), respectively. Here, the bearing (B) positioned in the housing (100) may be called the first bearing or lower bearing, and the bearing (B) positioned in the cover (200) may be called the second bearing or upper bearing.

[0035] The above housing (100) may be formed in a cylindrical shape. The housing (100) may accommodate a stator (300), a rotor (400), etc. inside. At this time, the shape or material of the housing (100) may be varied. For example, the housing (100) may be formed of a metal material that can withstand high temperatures.

[0036] The housing (100) may include a pocket portion at the bottom capable of accommodating a bearing (B). Here, the pocket portion of the housing (100) may be referred to as a housing pocket portion.

[0037] The above cover (200) can be placed on the opening surface of the housing (100), that is, on the upper part of the housing (100), to cover the opening of the housing (100).

[0038] And, the cover (200) may include a pocket portion capable of accommodating a bearing (B). Here, the pocket portion of the cover (200) may be called a cover pocket portion.

[0039] The stator (300) induces electrical interaction with the rotor (400) to induce rotation of the rotor (400).

[0040] The stator (300) may be positioned inside the housing (100). At this time, the stator (300) may be supported on the inner circumference of the housing (100). Additionally, the stator (300) may be positioned outside the rotor (400). That is, the rotor (400) may be rotatably positioned inside the stator (300).

[0041] Referring to FIGS. 2 and 3, the stator (300) may include a stator core (310), an insulator (320) placed on the stator core (310), and a coil (330) wound on the insulator (320).

[0042] A coil (330) that forms a rotating magnetic field may be wound on the stator core (310). Here, the stator core (310) may be formed as a single core or formed by combining multiple divided cores.

[0043] The stator core (310) may be formed by stacking multiple plates in the form of thin steel plates, but is not necessarily limited thereto. For example, the stator core (310) may be formed as a single unit.

[0044] The stator core (310) may include a yoke (311), a plurality of teeth (312), and a shoe (313) formed at the inner end of the teeth (312). Here, the inner surface of the shoe (313) may be parallel to an imaginary line positioned perpendicular to the radial direction in a plane.

[0045] The yoke (311) may be formed in a cylindrical shape. Accordingly, the yoke (311) may include a planar ring-shaped cross section.

[0046] A plurality of the above-mentioned teeth (312) may be spaced apart from each other along the circumferential direction of the yoke (311). Accordingly, a slot, which is a space for winding a coil (330), may be formed between each of the above-mentioned teeth (312).

[0047] The shoe (313) may be extended inwardly 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).

[0048] The shoe (313) may be positioned to face the magnet (420) of the rotor (400). At this time, the shoe (313) may be positioned at a predetermined distance from the outer surface of the magnet (420) with respect to the radial direction. Here, the distance may be called an air gap and may be the distance between the shoe (313) and the magnet (420) in the radial direction.

[0049] The insulator (320) insulates the stator core (310) and the coil (330). Accordingly, the insulator (320) can be placed between the stator core (310) and the coil (330).

[0050] Accordingly, the coil (330) can be wound on the stator core (310) on which the insulator (320) is placed.

[0051] The rotor (400) rotates through electrical interaction with the stator (300). At this time, the rotor (400) can be rotatably positioned in correspondence with the stator (300).

[0052] The rotor (400) may include a rotor core (410) and a plurality of magnets (420) disposed on the outside of the rotor core (410). Additionally, the rotor (400) may include a can disposed on the outside of the rotor core (410) to which the magnets (420) are attached in order to prevent the magnets (420) from detaching and to increase the bonding strength. At this time, the magnets (420) may be disposed at predetermined intervals along the circumferential direction on the rotor core (410) with respect to the center (C).

[0053] The rotor core (410) may be implemented in a shape in which a plurality of plates in the form of thin steel plates are stacked, or in the form of a single tube.

[0054] And, a hole to which a shaft (500) is coupled may be formed in the center (C) of the rotor core (410).

[0055] The magnet (420) forms a rotating magnetic field with the coil (330) wound on the stator core (310) of the stator (300). Here, the magnet (420) is positioned on the outside of the rotor core (410) to enable the implementation of a Surface Permanent Magnet (SPM) type rotor.

[0056] Accordingly, the rotor (400) rotates due to the 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 the driving force of the motor.

[0057] The can can protect the rotor core (410) and the magnet (420) from physical or chemical stimuli. Additionally, the can can prevent the magnet (420) from detaching from the rotor core (410). Here, the can can be positioned to cover the magnet (420) placed on the rotor core (410).

[0058] The shaft (500) can be rotatably positioned inside the housing (100) by means of a bearing (B). And, the shaft (500) can rotate together with the rotation of the rotor (400).

[0059] And, the shaft (500) can be joined by a press-fit method to a hole formed in the center of the rotor core (410).

[0060] The above bus bar (600) can be positioned on the upper part of the stator (300), as shown in FIG. 2. The bus bar (600) can be electrically connected to the coil (330) of the stator (300).

[0061] FIG. 4 is a perspective view showing a busbar of a motor according to an embodiment, FIG. 5 is a diagram showing the coupling relationship of a power terminal of a busbar disposed in a motor according to an embodiment, FIG. 6 is a plan view showing a busbar according to an embodiment, FIG. 7 is a plan view showing a plurality of power terminals disposed in a busbar according to an embodiment, FIG. 8 is a perspective view showing one of a plurality of busbar terminals disposed in a busbar according to an embodiment, FIG. 9 is an exploded perspective view showing one of a plurality of busbar terminals disposed in a busbar according to an embodiment, FIG. 10 is a front view showing one of a plurality of busbar terminals disposed in a busbar according to an embodiment, FIG. 11 is a cross-sectional view showing the BB line of FIG. 10, and FIG. 12 is a diagram showing a busbar terminal according to an embodiment formed for cutting on a single plate. Here, FIG. 11 may show the contact relationship between the body of one of a plurality of busbar terminals disposed in a busbar according to an embodiment and a power terminal.

[0062] Referring to FIGS. 4 to 6, the busbar (600) may include a busbar body (700) formed of an insulating material and a plurality of busbar terminals (800) disposed on the busbar body (700). Here, the busbar terminals (800) may be disposed spaced apart from each other in a radial direction. Accordingly, the plurality of busbar terminals (800) may include a first busbar terminal (800a), a second busbar terminal (800b), and a third busbar terminal (800c) disposed along a radial direction with respect to a center (C).

[0063] The above busbar (600) can vary the position where power is applied by a busbar terminal (800) implemented through the combination of two members and a plurality of grooves (710) formed in the busbar body (700) to expose a portion of the busbar terminal (800). At this time, the busbar (600) may be called a busbar assembly.

[0064] The above busbar body (700) may be a molded product formed through injection molding. Accordingly, the busbar (600) can be formed by injecting the busbar body (700) while the plurality of busbar terminals (800) are arranged spaced apart from each other in the radial direction.

[0065] A plurality of grooves (710) may be formed on the upper surface of the busbar body (700) at spaced intervals along the circumferential direction. Here, holes may be provided instead of the grooves (710).

[0066] The above groove (710) may be formed long to have a predetermined width (W1) in the radial direction. For example, the above groove (710) may be formed in a rectangular shape having a predetermined width (W1) in the radial direction.

[0067] Additionally, the radial width (W1) of the groove (710) may be greater than the difference between the radius (R3) of the outer surface of the third busbar terminal (800c) and the radius (R1) of the inner surface of the first busbar terminal (800a). That is, the difference between the radius (R3) of the outer surface of the third busbar terminal (800c) and the radius (R1) of the inner surface of the first busbar terminal (800a) may be smaller than the radial width (W1) of the groove (710). Accordingly, the power terminal (820) can be coupled with a portion of the body (810) exposed through the groove (710).

[0068] Since the groove (710) is formed axially concavely on the upper surface of the busbar body (700), a portion of the body (810) of the busbar terminal (800) may be exposed through the groove (710). Accordingly, the power terminal (820) of the busbar terminal (800) may be coupled with a portion of the body (810) constituting the busbar terminal (800) through the groove (710). At this time, the portion exposed by the groove (710) may be a protrusion (813) of the body (810).

[0069] Since the above-mentioned grooves (710) are formed in multiple numbers spaced apart from each other along the circumferential direction, the placement position of the power terminal (820) on the bus bar (600) can be varied. For example, the power terminal (820) can change its coupling position with the body (810) by considering the shape and placement position of a connector (not shown) that applies external power. Accordingly, the bus bar (600) can actively respond to the connector.

[0070] One side of the busbar terminal (800) may be electrically connected to the coil (330) of the stator (300). And, the other side of the busbar terminal (800) may be electrically connected to an external power source.

[0071] The above busbar terminal (800) can be formed by combining two separated members. That is, the above busbar terminal (800) can be formed by combining a body (810) and a power terminal (820).

[0072] Accordingly, the busbar terminal (800) according to the embodiment does not cut the body and the power terminal, which are integrally formed from a single plate like conventional busbar terminals, at once.

[0073] Referring to FIG. 12, since only the body (810) can be formed by cutting from a single plate, the amount of scrap that is cut and discarded can be minimized due to the structure of the busbar terminal (800) formed from two members.

[0074] For example, the busbar terminal (800) according to the embodiment can minimize the amount of scrap that is cut and discarded because the body (810) and the power terminal (820) are arranged in a single plate having a predetermined thickness and the body (810) and the power terminal (820) are cut separately. As shown in FIG. 7, the plate provided to make the body (810) and the power terminal (820) is formed with a predetermined width (W) that is smaller than the width of the plate provided to make the conventional busbar terminal, so the amount of scrap that is cut and discarded can be minimized.

[0075] And, the body (810) of the busbar terminal (800) can be formed by cutting only the area corresponding to the body (810) from a single plate and bending the primary material that has been processed primary.

[0076] The above busbar terminal (800) may include a body (810) electrically connected to the end of the coil (330), and a power terminal (820) coupled to the body (810). Here, the body (810) and the power terminal (820) may be coupled through a coupling structure and shape formed on each of the body (810) and the power terminal (820). Furthermore, after the body (810) and the power terminal (820) are coupled, the coupling between the body (810) and the power terminal (820) may be further strengthened through fusing, welding, bonding, etc.

[0077] The power terminal (820) may be electrically connected to a connector (not shown) provided to apply external power. Accordingly, one side of the power terminal (820) may be exposed to the outside by penetrating the cover (200).

[0078] FIG. 13 is a perspective view showing the body of a busbar terminal placed on a busbar according to an embodiment, FIG. 14 is a plan view showing the body of a busbar terminal placed on a busbar according to an embodiment, and FIG. 15 is a front view showing the body of a busbar terminal placed on a busbar according to an embodiment.

[0079] Referring to FIGS. 13 to 15, the body (810) may include a body portion (811), a terminal portion (812) coupled to the coil (330), and a protrusion (813) protruding axially from the upper surface (811a) of the body portion (811).

[0080] Additionally, the body (810) may further include at least two second protrusions (814) formed to protrude axially from the upper surface (813a) of the protrusion (813). At this time, as the two second protrusions (814) are formed to be spaced apart from each other in the width direction (circumferential direction) of the protrusion (813), a groove (815) may be formed between the two second protrusions (814). Here, the groove (815) may be referred to as the second groove.

[0081] The above body (810) can be formed by cutting and then bending a plate-shaped material. Accordingly, the body part (811), terminal part (812), protrusion part (813), and second projection (814) can be formed integrally.

[0082] When viewed from the axial direction, the body portion (811) may be formed in an arc shape having a predetermined curvature (1 / R). Accordingly, one surface of the body portion (811) may be formed as a curved surface having a predetermined curvature.

[0083] A plurality of terminal portions (812) may be formed on the upper part of the body portion (811). As shown in FIG. 14, three terminal portions (812) may be arranged at equal intervals along the circumferential direction with respect to the center (C).

[0084] Additionally, the terminal portion (812) may be formed in a hook shape for fusing with the end of the coil (330). At this time, the terminal portion (812) may be formed to protrude radially from the upper surface (811a) of the body portion (811).

[0085] The protrusion (813) may be formed to extend axially from the upper surface (811a) of the body part (811) and may be coupled to one side of the power terminal (820). Here, since the protrusion (813) is formed to have a predetermined height axially from the upper surface (811a) of the body part (811), even if the protrusion (813) of one busbar terminal (800) is coupled to the power terminal (820), contact between the power terminal (820) and the other busbar terminal (800) is prevented.

[0086] The above protrusion (813) can be coupled between the first projection (822) of the power terminal (820). For example, since the protrusion (813) can be positioned to overlap the groove (710) in the axial direction, a portion of the protrusion (813) may be exposed by the groove (710). Accordingly, the protrusion (813) can be coupled between the first projection (822) of the power terminal (820).

[0087] In addition, the above protrusion (813) may be formed to have a predetermined width (W2) based on the circumferential direction.

[0088] Additionally, the protrusion (813) may be formed to have the same curvature (1 / R) as the body part (811). Accordingly, when the protrusion (813) and the power terminal (820) are joined by a press-fit method using a groove (823) formed at the lower end of the power terminal (820), the joining becomes more solid due to the curvature (1 / R).

[0089] The second projection (814) is formed to protrude axially on the upper surface (813a) of the protrusion (813), and at least two may be spaced apart from each other in the width direction of the protrusion (813). That is, two of the second projections (814) are spaced apart from each other with respect to the circumferential direction and are arranged on the protrusion (813), and a groove (815) may be formed between the two second projections (814).

[0090] The two second protrusions (814) can guide the connection of the power terminal (820). Here, the second protrusions (814) can be connected to the power terminal (820) by a press-fit method and come into contact with the power terminal (820). At this time, the two second protrusions (814) can support the power terminal (820) to prevent movement of the power terminal (820).

[0091] Each of the two second protrusions (814) may include a contact surface (814a) that contacts the power terminal (820). Accordingly, the contact surface (814a) may contact one side of the power terminal body (821) of the power terminal (820).

[0092] The contact surface (814a) may be a plane positioned facing the power terminal (820). Here, the contact surface (814a) may be a plane formed parallel to an imaginary line (L1) connecting the center (C) and the center (C1) of the protrusion (813). Accordingly, the contact surface (814a) may make surface contact with the power terminal body (821).

[0093] The groove (815) is formed between the two second protrusions (814). Accordingly, the upper end of the protrusion (813) can be formed with an axially concave groove (815) by the two second protrusions (814).

[0094] And, the second groove (815) can be joined to intersect with the first groove (823) formed at the lower end of the power terminal (820).

[0095] The power terminal (820) can be formed by cutting a plate-shaped material. Accordingly, the power terminal (820) can be formed in a bar shape without any bent areas.

[0096] Additionally, the power terminal (820) may be formed to have a predetermined width (W3) with respect to the circumferential direction. Here, the width (W3) of the power terminal (820) with respect to the circumferential direction may be formed to be smaller than the width (W2) of the protrusion (813). That is, the width (W2) of the protrusion (813) may be formed to be larger than the width (W3) of the power terminal (820). Accordingly, the power terminal (820) may be positioned between the second protrusions (814).

[0097] Meanwhile, one side of the power terminal (820), the lower side, is coupled with the protrusion (813), and the other side, the upper side, can be coupled with a device (not shown) capable of supplying external power, such as a connector. Accordingly, power transmitted through the protrusion (813) can be transmitted to the coil (330) through the terminal part (812).

[0098] FIG. 16 is a drawing showing a power terminal placed on a busbar according to an embodiment, and FIG. 17 is a drawing showing a modified example of a power terminal placed on a busbar according to an embodiment.

[0099] Referring to FIGS. 16 and 17, the power terminal (820) may include a power terminal body (821) and at least two first protrusions (822) that protrude spaced apart from each other from the lower surface of the power terminal body (821).

[0100] Additionally, as the two first protrusions (822) are formed spaced apart, the power terminal (820) may include a groove (823) formed between the two first protrusions (822). Here, the groove (823) of the power terminal (820) may be referred to as the first groove.

[0101] Additionally, the power terminal (820) may further include a third projection (824) formed to protrude from the mutually facing surfaces of each of the two first projections (822). Here, the power terminal body (821), the first projection (822), and the third projection (824) may be formed integrally.

[0102] The power terminal body (821) can be formed by cutting a plate-shaped material. Accordingly, the power terminal body (821) can be formed in a bar shape. For example, the power terminal body (821) can be formed in a roughly rectangular shape.

[0103] The first projection (822) may be formed to protrude from the lower surface of the power terminal body (821), and at least two may be spaced apart from each other in the radial direction. Accordingly, the first projection (822) may include a first-1 projection (822a) positioned inward with respect to the radial direction and a first-2 projection (822b) positioned outward. Here, the first-1 projection (822a) and the first-2 projection (822b) may be formed to have a rectangular cross-section. For example, the first-1 projection (822a) and the first-2 projection (822b) may be formed to have a rectangular or square cross-section.

[0104] The two first protrusions (822) can guide the connection between the power terminal (820) and the protrusion (813) of the body (810). Here, the first protrusions (822) can be connected to the protrusion (813) by a press-fit method and come into contact with the protrusion (813).

[0105] Referring to FIG. 11, each outer edge of the first-1 projection (822a) can come into contact with the inner surface (813b) of the projection (813) due to the curvature (1 / R) of the projection (813). For example, the first-1 projection (822a) can make two-point contact with the projection (813) on a horizontal plane. Accordingly, a radial gap can be formed between the center of the first-1 projection (822a) and the inner surface (813b) of the projection (813).

[0106] Additionally, due to the curvature (1 / R) of the protrusion (813), the inner surface (822b-1) of the first-second protrusion (822b) can come into contact with the outer surface (813c) of the protrusion (813). That is, the central side of the first-second protrusion (822b) on a horizontal plane can make one-point contact with the protrusion (813). Accordingly, a radial gap can be formed between both ends of the first-second protrusion (822b) and the outer surface (813c) of the protrusion (813).

[0107] Accordingly, the two first protrusions (822) reinforce the connection between the protrusion (813) and the power terminal (820) by forming a three-point support connection through the curvature (1 / R) of the protrusion (813). Additionally, the two first protrusions (822) can prevent contact failure by making three-point contact with the protrusion (813).

[0108] The groove (823) is formed between the two first protrusions (822). Accordingly, the groove (823) can be formed axially concavely at the lower end of the power terminal (820) by the two first protrusions (822). Thus, the first groove can be joined to intersect with the second groove, thereby guiding the connection between the protrusion (813) and the power terminal (820).

[0109] Referring to FIG. 17, the power terminal (820) may further include a third projection (824) formed to protrude from each of the two first projections (822) facing each other. For example, the third projection (824) may include a third-1 projection (824a) formed to protrude from the outer surface (822a-1) of the first-1 projection (822a) and a third-2 projection (824b) formed to protrude from the inner surface (822b-1) of the first-2 projection (822b).

[0110] When the protrusion (813) and the power terminal (820) are press-fitted, the third-1 projection (824a) may come into contact with a portion of the inner surface (813b) of the protrusion (813). Additionally, the third-2 projection (824b) may come into contact with a portion of the outer surface (813c) of the protrusion (813).

[0111] Accordingly, a pair of third protrusions (824) positioned facing each other can perform the function of improving the contact amount and bonding force between the protrusion (813) and the power terminal (820).

[0112] The sensor unit (900) can detect the magnetic force of a sensing magnet installed to rotate in conjunction with the rotor (400) to determine the current position of the rotor (400). Accordingly, the sensor unit (900) can detect the rotation of the shaft (500).

[0113] The sensor unit (900) may include a sensing magnet assembly (910) and a printed circuit board (PCB, 920).

[0114] The sensing magnet assembly (910) is coupled to the shaft (500) to work in conjunction with the rotor (400) so as to detect the position of the rotor (400). At this time, the sensing magnet assembly (910) may include a sensing magnet and a sensing plate.

[0115] The above sensing magnet may include a main magnet arranged circumferentially adjacent to a hole forming an inner surface and a sub-magnet formed at the edge.

[0116] The above main magnet can be arranged in the same way as the drive magnet inserted into the rotor (400) of the motor.

[0117] The above sub-magnet can be formed to have more poles than the above main magnet, with more fine divisions. Accordingly, the above sub-magnet makes it possible to measure the rotation angle by dividing it more finely and can induce smoother driving of the motor.

[0118] The sensing plate may be formed from a disc-shaped metal material. A sensing magnet may be attached to the upper surface of the sensing plate. The sensing plate may be attached to a shaft (500). Here, a hole through which the shaft (500) passes may be formed in the sensing plate.

[0119] A sensor for detecting the magnetic force of the sensing magnet may be placed on the printed circuit board (920). Here, the sensor may be provided as a Hall IC. The sensor may generate a sensing signal by detecting a change in the N and S poles of the sensing magnet. Accordingly, the printed circuit board (920) on which the Hall IC is placed may be called a sensing assembly or a position sensing device.

[0120] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0121] 1: Motor 100: Housing 200: Cover 300: Status 310: Status Core 330: Coil 400: Rotor 410: Rotor core 420: Magnet 500: Shaft 600: Busbar 700: Busbar body 800: Bus terminal 810: Body 811: Body part 812: Terminal part 813: Protrusion 814: Second projection 820: Power terminal 821: Power terminal body 822: 1st projection 824: 3rd projection 900: Sensor section

Claims

Claim 1 A motor comprising: a stator; a rotor positioned to correspond to the stator; a shaft coupled to the rotor; and a busbar positioned above the stator, wherein the busbar comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals positioned on the busbar body, wherein the busbar terminal comprises a body and a power terminal coupled to the body, wherein the power terminal is coupled to a portion of the body exposed through the grooves, and wherein the power terminal comprises a power terminal body and at least two first protrusions protruding spaced apart from each other from the lower surface of the power terminal body, wherein the first protrusions comprise a first-1 protrusion that contacts the inner surface of the protrusion of the body and a first-2 protrusion that contacts the outer surface of the protrusion, wherein each outer edge of the first-1 protrusion contacts the inner surface of the protrusion, and the inner surface of the first-2 protrusion contacts the outer surface of the protrusion. Claim 2 In claim 1, the plurality of busbar terminals include a first busbar terminal, a second busbar terminal, and a third busbar terminal arranged along the radial direction, and the difference between the radius (R3) of the outer surface of the third busbar terminal and the radius (R1) of the inner surface of the first busbar terminal is smaller than the radial width (W1) of the groove. Claim 3 In claim 1, the body comprises an arc-shaped body portion having a predetermined curvature, a plurality of terminal portions disposed on the body portion, and the protrusions protruding axially from the upper surface of the body, and the power terminal comprises a power terminal body and at least two first protrusions protruding spaced apart from each other from the lower surface of the power terminal body, and the protrusions are coupled between the first protrusions, and the curvature of the body portion and the curvature of the protrusions are the same with respect to the center. Claim 4 In paragraph 3, the motor is positioned such that the protrusion overlaps the groove in the axial direction. Claim 5 A stator; a rotor positioned to correspond to the stator; and a shaft coupled to the rotor. A motor comprising a busbar disposed on the upper side of the stator, wherein the busbar comprises a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals disposed on the busbar body, wherein the busbar terminal comprises a body and a power terminal coupled to the body, wherein the body comprises an arc-shaped body portion having a predetermined curvature, a plurality of terminal portions disposed on the body portion, and a protrusion protruding axially from the upper surface of the body, wherein the power terminal comprises a power terminal body and at least two first protrusions protruding spaced apart from each other from the lower surface of the power terminal body, wherein the protrusions are coupled between the first protrusions, and the curvature of the body portion and the curvature of the protrusions are the same with respect to the center, wherein the body comprises at least two second protrusions protruding axially from the upper surface of the protrusions, and wherein the power terminal body is coupled between the second protrusions, and the contact surface of the second protrusions in contact with the power terminal body is a plane formed parallel to a virtual line (L1) connecting the center (C) and the center (C1) of the protrusions. Claim 6 In paragraph 3 or 5, the motor in which the width (W2) of the protrusion is larger than the width (W3) of the projection based on the circumferential direction. Claim 7 In claim 5, the first projection comprises a first-1 projection in contact with the inner surface of the protrusion and a first-2 projection in contact with the outer surface of the protrusion, wherein each outer edge of the first-1 projection contacts the inner surface of the protrusion and the inner surface of the first-2 projection contacts the outer surface of the protrusion. Claim 8 In claim 7, the motor comprises a third projection formed to protrude from the outer surface of the first-1 projection and the inner surface of the first-2 projection, respectively, wherein the third projection comprises a third-1 projection formed to protrude from the outer surface of the first-1 projection and a third-2 projection formed to protrude from the inner surface of the first-2 projection, and the third-1 projection contacts the inner surface of the projection. Claim 9 In paragraph 3, the body comprises at least two second protrusions protruding axially from the upper surface of the protrusion, the power terminal body is coupled between the second protrusions, and the contact surface of the second protrusion in contact with the power terminal body is a plane formed parallel to a virtual line (L1) connecting the center (C) and the center (C1) of the protrusion. Claim 10 A busbar comprising a busbar body having a plurality of grooves formed along the circumferential direction and a plurality of busbar terminals disposed on the busbar body, wherein the busbar terminals include a body and a power terminal coupled to the body, wherein the body includes an arc-shaped body portion having a predetermined curvature, a plurality of terminal portions disposed on the body portion, and a protrusion protruding axially from the upper surface of the body, wherein the power terminal includes a first groove formed axially concavely at the lower end, wherein the power terminal is coupled to the protrusion through the first groove, wherein the curvature of the body portion and the curvature of the protrusion are the same with respect to the center, wherein the body includes at least two second protrusions protruding axially from the upper surface of the protrusion, wherein the power terminal is coupled between the second protrusions, and the contact surface of the second protrusion contacting the power terminal is a plane formed parallel to a virtual line (L1) connecting the center (C) and the center (C1) of the protrusion. Claim 11 In claim 10, the plurality of busbar terminals comprises a first busbar terminal, a second busbar terminal, and a third busbar terminal arranged along the radial direction, and the difference between the radius (R3) of the outer surface of the third busbar terminal and the radius (R1) of the inner surface of the first busbar terminal is smaller than the radial width (W1) of the groove. Claim 12 In item 10, the width (W2) of the protrusion is larger than the width (W3) of the power terminal based on the circumferential direction. Claim 13 In claim 12, a second groove is formed axially concavely at the upper end of the above-mentioned protrusion, and the first groove intersects and joins with the second groove to form a bus bar.

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