Motor

Abstract

An embodiment discloses a motor comprising: a housing; a stator disposed inside the housing; 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 and a plurality of busbar terminals disposed on the busbar body, and a groove formed in the busbar body engages with a projection protruding from the inner circumference of the housing. Accordingly, the motor can determine the true position and protrusion height of the busbar terminals disposed on the busbar by securing the true position of the busbar using the groove formed in the busbar and the projection formed in the housing.

Description

Technology Field

[0001] The example relates to a motor. 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] In arranging the busbar in the above motor, an insulator is placed on the stator core of the stator, a coil is wound, and the coil is connected to the busbar, and the stator and the busbar are arranged inside the housing.

[0005] Therefore, when assembling the motor, an accumulated tolerance occurs, and this accumulated tolerance affects the true position of the busbar terminal placed on the busbar. Consequently, if the true position of the busbar terminal is not secured, there is a problem in that a defect occurs when the connector applying external power is combined with the busbar terminal.

[0006] Accordingly, there is a demand for a motor that secures the true position of the busbar terminal by mitigating the aforementioned accumulated tolerance. The problem to be solved

[0007] The embodiment provides a motor having a structure formed to secure the true position of the busbar.

[0008] 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

[0009] The above problem is achieved by a motor comprising: a housing; a stator disposed inside the housing; a rotor disposed corresponding to the stator; a shaft coupled to the rotor; and a busbar disposed on the upper side of the stator, wherein the busbar comprises a busbar body and a plurality of busbar terminals disposed on the busbar body, and a groove formed in the busbar body engages with a projection protruding from the inner circumference of the housing.

[0010] Here, the busbar body includes a body portion and a plurality of protrusions protruding radially from the outer surface of the body portion, and the groove may be formed axially concavely on the lower surface of the end side of the protrusion.

[0011] Preferably, the lower surface of the body part and the lower surface of the protrusion part can be arranged on a virtual same horizontal plane.

[0012] And, based on the lower surface of the body part, the axial height (H1) of the protrusion may be smaller than the axial height (H2) of the terminal part of the busbar terminal.

[0013] In addition, the above protrusion may be positioned so as not to overlap the terminal portion in the axial direction.

[0014] Meanwhile, the above-mentioned protrusion includes a pair of first protrusions and a pair of second protrusions arranged rotationally symmetrically with respect to the center, and

[0015] With respect to the circumferential direction, the first central angle (θ1) formed by either the first protrusion or the second protrusion is smaller than the second central angle (θ2) formed by the other of the first protrusion and the second protrusion, and the sum of the first central angle (θ1) and the second central angle (θ2) may be 180 degrees.

[0016] Meanwhile, the housing includes a groove formed concavely in the radial direction on the outer surface of the housing, and the groove may be arranged to overlap the projection in the radial direction. Effects of the invention

[0017] In the embodiment, by utilizing a groove formed in the busbar and a projection formed in the housing to secure the true position of the busbar, the position and protrusion height of the busbar terminal placed on the busbar can be determined. Accordingly, the coupling of the connector that applies external power and the busbar terminal can be easily induced.

[0018] 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

[0019] FIG. 1 is a perspective view showing a motor according to an embodiment, and FIG. 2 is a cross-sectional view showing a motor according to an embodiment, and FIG. 3 is an exploded perspective view showing the arrangement relationship of a housing, a stator, and a busbar disposed in a motor according to an embodiment, and FIG. 4 is a perspective view showing a housing of a motor according to an embodiment, and FIG. 5 is a cross-sectional view showing the housing of a motor according to an embodiment, and FIG. 6 is a perspective view showing a busbar of a motor according to an embodiment, and FIG. 7 is a front view showing a busbar of a motor according to an embodiment, and FIG. 8 is a plan view showing a busbar of a motor according to an embodiment, and FIG. 9 is a bottom view showing a busbar of a motor according to an embodiment, and FIG. 10 is a perspective view showing the busbar terminal of the busbar of a motor according to an embodiment. Specific details for implementing the invention

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] FIG. 1 is a perspective view showing a motor according to an embodiment, FIG. 2 is a cross-sectional view showing a motor according to an embodiment, and FIG. 3 is an exploded perspective view showing the arrangement relationship of a housing, a stator, and a busbar placed in a motor according to an embodiment. In FIG. 1 and 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). Also, the reference numeral 'C' shown in FIG. 1 to FIG. 3 may represent the center of rotation of the shaft (500).

[0028] Referring to FIGS. 1 to 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), and a bus bar (600) disposed on the upper side of the stator (300). The bus bar (600) may include a bus bar body and a plurality of bus bar terminals (630) disposed on the bus bar body. 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.

[0029] The motor can secure the true position of the bus bar (600) through the alignment of a projection (120) formed to protrude from the inner circumferential surface (110) of the housing (100) and a groove formed in the bus bar (600). For example, since the bus bar (600) secures the true position of the bus bar (600) through the combination of the housing (100) and the bus bar (600) without the influence of other assembly processes, the influence of accumulated tolerances caused by the assembly process of the stator (300) can be eliminated. That is, since the bus bar (600) is combined with the housing (100) so as to be supported by the housing (100), the final position of the bus bar terminal (630) placed on the bus bar (600) can be secured without the influence of the accumulated tolerances.

[0030] 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), and a bus bar (600), etc., can be arranged in the receiving space.

[0031] 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.

[0032] FIG. 4 is a perspective view showing a housing of a motor according to an embodiment, and FIG. 5 is a cross-sectional view showing a housing of a motor according to an embodiment. FIG. 5 is a cross-sectional view showing line AA of FIG. 4.

[0033] Referring to FIGS. 1 to 5, the housing (100) may be formed in a cylindrical shape including an inner surface (110) and an outer surface (130), with an opening formed on one side. Here, 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.

[0034] Additionally, the housing (100) may include a plurality of protrusions (120) formed to protrude from the inner surface (110) and a groove (140) formed concavely on the outer surface (130).

[0035] The above-mentioned projection (120) is formed to protrude from the inner surface (110) and can support one side of the bus bar (600). At this time, the projection (120) can be formed in a shape corresponding to the groove (621) of the bus bar (600). Accordingly, the projection (120) can be coupled to the groove (621) to support the bus bar (600).

[0036] The above-mentioned protrusion (120) can be placed at a preset position of the housing (100). Accordingly, the position of the busbar (600) supported by the above-mentioned protrusion (120) is determined solely in relation to the housing (100), regardless of cumulative tolerance. That is, since the busbar terminal (630) is placed in the busbar body via an insert injection method, the above-mentioned protrusion (120) functions as a primary factor in determining the final position of the busbar terminal (630).

[0037] The groove (140) may be formed concavely on the outer surface (130) of the housing (100). At this time, the groove (140) may be arranged to overlap (superimpose) the projection (120) in a radial direction. For example, the groove (140) may be formed by applying a predetermined load to a portion of the outer surface (130) of the housing. At this time, a portion of the housing (100) may protrude relative to the inner surface (110). Accordingly, the projection (120) may be formed. That is, the projection (120) and the groove (140) may be formed at once by applying a predetermined load to the outer surface (130) of the housing (100).

[0038] Additionally, 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.

[0039] The above cover (200) may 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). Here, the cover (200) may be called a bearing plate.

[0040] 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.

[0041] The stator (300) induces electrical interaction with the rotor (400) to induce rotation of the rotor (400).

[0042] 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).

[0043] 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).

[0044] 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.

[0045] 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.

[0046] The stator core (310) may include a yoke and a plurality of teeth protruding radially from the yoke.

[0047] The above yoke may be formed in a cylindrical shape. Accordingly, the yoke may include a planar ring-shaped cross-section.

[0048] A plurality of the above-mentioned teeth may be spaced apart from each other along the circumferential direction of the yoke. Accordingly, a slot, which is a space for winding a coil (330), may be formed between each of the above-mentioned teeth.

[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 bus bar (600) can be positioned on the upper part of the stator (300), as shown in FIGS. 2 and 3. The bus bar (600) can be electrically connected to the coil (330) of the stator (300).

[0061] FIG. 6 is a perspective view showing a busbar of a motor according to an embodiment, FIG. 7 is a front view showing a busbar of a motor according to an embodiment, FIG. 8 is a top view showing a busbar of a motor according to an embodiment, FIG. 9 is a bottom view showing a busbar of a motor according to an embodiment, and FIG. 10 is a perspective view showing a busbar terminal of a busbar of a motor according to an embodiment.

[0062] Referring to FIGS. 6 to 10, the busbar (600) may include a busbar body formed of an insulating material and a plurality of busbar terminals (630) disposed on the busbar body. Here, the busbar body includes a groove (621) that engages with the projection (120), and the busbar (600) may be supported by the housing (100) by coupling the projection (120) and the groove (621).

[0063] The above busbar body may be a molded product formed through injection molding. Accordingly, the busbar (600) can be formed by injecting the busbar body while the plurality of busbar terminals (630) are arranged spaced apart from each other in the radial direction.

[0064] The above busbar body includes a ring-shaped body portion (610) and a plurality of protrusions (620) protruding radially from the outer surface of the body portion (610), and the body portion (610) and the protrusions (620) can be formed integrally.

[0065] The above body part (610) can be formed in a ring shape having an inner surface and an outer surface.

[0066] A plurality of protrusions (620) may be formed to protrude radially from the outer surface of the body part (610).

[0067] The groove (621) may be formed axially concavely on the lower surface of the end side of the protrusion (620). Specifically, the groove (621) may be spaced apart from the outer surface of the body part (610) at a predetermined distance. At this time, as the groove (621) to which the projection (120) is coupled is formed, a support part (622) may be formed on the circumferential side of the groove (621). Here, since the support part (622) is supported by the projection (120), circumferential movement of the bus bar (600) can be prevented by the projection (120).

[0068] Meanwhile, as illustrated in FIG. 7, the lower surface of the body part (610) and the lower surface of the protrusion (620) may be positioned on a virtual same horizontal plane. Here, the lower surface of the body part (610) and the lower surface of the protrusion (620) are positioned on a virtual same horizontal plane as an example, but are not necessarily limited thereto. For instance, the protrusion (620) may be formed at an angle to have a predetermined angle of inclination with respect to the lower surface of the body part (610). However, in the case of a protrusion formed at an angle, there is a problem of increasing the axial size of the motor. Therefore, the motor can reduce the axial size of the motor by positioning the lower surface of the body part (610) and the lower surface of the protrusion (620) on the same horizontal plane.

[0069] Additionally, the axial height (H1) of the protrusion (620) can be formed to be smaller than the axial height (H2) of the terminal portion (632) of the busbar terminal (630) based on the lower surface of the body portion (610). At this time, the protrusion (620) can be formed so as not to overlap the terminal portion (632) in the axial direction. That is, when viewed from the axial direction, the protrusion (620) is positioned between the terminal portion (632) based on the circumferential direction and can be positioned spaced apart from the terminal portion (632) in the circumferential direction. Accordingly, the end of the coil (330) can be coupled with the terminal portion (632) without interfering with the protrusion (620).

[0070] Accordingly, since the bus bar (600) is formed in a two-layer structure in which the protrusion (620) is positioned lower than the terminal portion (632) and does not interfere with each other in the circumferential direction, the radial size of the bus bar (600) can be reduced.

[0071] In addition, the radial protrusion length of the protrusion (620) is greater than the radial protrusion length of the terminal portion (632) of the busbar terminal (630).

[0072] Referring to FIG. 8, the protrusion (620) may include a pair of first protrusions (620a) and a pair of second protrusions (620b) arranged rotationally symmetrically with respect to the center (C). For example, the pair of first protrusions (620a) may be formed to have a central angle of 180 degrees with respect to the center (C). And, the pair of second protrusions (620b) may also be formed to have a central angle of 180 degrees with respect to the center (C).

[0073] Also, based on the above circumferential direction, the first central angle (θ1) formed by either the first protrusion (620a) or the second protrusion (620b) may be smaller than the second central angle (θ2) formed by the other of the first protrusion (620a) and the second protrusion (620b). Here, the sum of the first central angle (θ1) and the second central angle (θ2) may be 180 degrees.

[0074] One side of the busbar terminal (630) can be electrically connected to the coil (330) of the stator (300). And, the other side of the busbar terminal (630) can be electrically connected to an external power source.

[0075] Additionally, the busbar terminals (630) may be arranged in a radially spaced manner. For example, the busbar terminals (630) may be arranged in the body portion (610) in a radially spaced manner with respect to the center (C).

[0076] Referring to FIG. 10, the busbar terminal (630) may include a body (631), a terminal portion (632) coupled to the coil (330), and a power terminal portion (633) protruding axially from the body (631). Here, the body (631), the terminal portion (632), and the power terminal portion (633) may be formed integrally.

[0077] The above body (631) may be formed in an arc shape having a predetermined curvature when viewed from the axial direction. Accordingly, one surface of the above body (631) may be formed as a curved surface having a predetermined curvature.

[0078] A plurality of terminal portions (632) may be formed on the upper part of the body (631). Here, the terminal portions (632) may be arranged at equal intervals along the circumferential direction with respect to the center (C).

[0079] Additionally, the terminal portion (632) may be formed in a hook shape for fusing with the end of the coil (330). At this time, the terminal portion (632) may be formed to protrude radially from the upper surface of the body (631).

[0080] The power terminal portion (633) may be formed to extend axially from the upper surface of the body (631).

[0081] Additionally, the power terminal portion (633) may be electrically connected to a connector (not shown) provided to apply external power. Accordingly, as shown in FIG. 1, one side of the power terminal portion (633) may be exposed to the outside by penetrating the cover (200). Thus, power transmitted through the power terminal portion (633) may be transmitted to the coil (330) through the terminal portion (632).

[0082] 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

[0083] 1: Motor 100: Housing 200: Cover 300: Status 310: Status Core 330: Coil 400: Rotor 410: Rotor core 420: Magnet 500: Shaft 600: Busbar 610: Body part 620: Protrusion part 621: Home 630: Bus terminal

Claims

Claim 1 A motor comprising: a housing; a stator disposed inside the housing; a rotor disposed corresponding to the stator; a shaft coupled to the rotor; and a busbar disposed on the upper side of the stator, wherein the busbar comprises a busbar body and a plurality of busbar terminals disposed on the busbar body, the busbar body comprises a body portion and a plurality of protrusions protruding radially from the outer surface of the body portion, a groove formed in the protrusions fits with a projection protruding from the inner surface of the housing, and the protrusions do not overlap axially with the terminal portions of the busbar terminals. Claim 2 In claim 1, the groove is formed axially concavely on the lower surface of the end side of the protrusion. Claim 3 In paragraph 2, the lower surface of the body part and the lower surface of the protrusion part are positioned on a virtual same horizontal plane. Claim 4 In paragraph 3, the motor in which the axial height (H1) of the protrusion is smaller than the axial height (H2) of the terminal portion of the busbar terminal, based on the lower surface of the body portion. Claim 5 delete Claim 6 A motor comprising: a housing; a stator disposed inside the housing; a rotor disposed corresponding to the stator; a shaft coupled to the rotor; and a busbar disposed on the upper side of the stator, wherein the busbar comprises a busbar body and a plurality of busbar terminals disposed on the busbar body, the busbar body comprises a body portion and a plurality of protrusions protruding radially from the outer surface of the body portion, wherein the protrusions comprise a pair of first protrusions and a pair of second protrusions arranged rotationally symmetrically with respect to a center, wherein a first central angle (θ1) formed by either the first protrusion or the second protrusion with respect to the circumferential direction is smaller than a second central angle (θ2) formed by the other of the first protrusion and the second protrusion, and the sum of the first central angle (θ1) and the second central angle (θ2) is 180 degrees. Claim 7 In claim 1, the housing includes a groove formed radially concavely on the outer surface of the housing, and the groove is arranged to overlap radially with the projection.

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