Motor

Abstract

The present invention may provide a motor comprising: a shaft; a rotor coupled to the shaft; and a stator disposed corresponding to the rotor, a busbar disposed on the stator and a busbar holder supporting the busbar, a bearing supporting the shaft and a bearing housing supporting the bearing, wherein the bearing, the bearing housing, and the busbar holder are disposed to overlap in the radial direction of the shaft axis.

Description

Technology Field

[0001] The example relates to a motor. Background Technology

[0002] Generally, in a motor, the rotor rotates due to the electromagnetic interaction between the rotor and the stator. At this time, the shaft connected to the rotor also rotates to generate rotational driving force.

[0003] The rotor and stator are housed in a housing. The housing is a hollow cylindrical member. One side of the housing is open. A bearing housing covers one side of the open housing. The bearing housing includes a bearing.

[0004] The stator may include a stator core and a coil wound around the stator core. The coil may be connected to a busbar. The busbar is supported by a busbar holder. Three busbars may be provided, including U-phase, V-phase, and W-phase buses. When these three busbars are aligned radially with respect to the axis of the shaft, the radial width of the busbar holder increases, which causes a problem that results in design constraints for the motor. The problem to be solved

[0005] Accordingly, the embodiment aims to solve the aforementioned problem by reducing the radial width of the busbar holder, thereby providing a motor that is advantageous for design.

[0006] The problems that the present invention aims 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

[0007] An embodiment may provide a motor comprising a shaft, a rotor coupled to the shaft, and a stator disposed corresponding to the rotor, a busbar disposed on the stator, a busbar holder supporting the busbar, a bearing supporting the shaft, and a bearing housing supporting the bearing, wherein the bearing, the bearing housing, and the busbar holder are disposed to overlap in the radial direction of the shaft axis.

[0008] An embodiment may provide a motor comprising a shaft, a rotor coupled to the shaft, and a stator disposed corresponding to the rotor, and a bus bar disposed on the stator, wherein the bus bar comprises a first body having a third-1 radius with respect to the axis of the shaft, a third-2 body having a second radius different from the first radius, and a bending portion connecting the first body and the second body.

[0009] An embodiment may provide a motor comprising a shaft, a rotor coupled to the shaft, and a stator disposed corresponding to the rotor, and a bus bar disposed on the stator, wherein the bus bar comprises a first bus bar, a second bus bar, and a third bus bar extending circumferentially with respect to the axis of the shaft, wherein with respect to the axis of the shaft, the first bus bar has a first radius, the second bus bar has a second radius different from the first radius, and the third bus bar has a third radius which is the distance between the first radius and the second radius. Effects of the invention

[0010] According to the embodiment, by reducing the radial width of the busbar holder, there is an advantage in securing favorable design conditions for the motor.

[0011] According to the embodiment, there is an advantage in that the axial length of the motor can be reduced.

[0012] According to the embodiment, there is an advantage in that the motor torque can be secured while reducing the axial length of the motor. Brief explanation of the drawing

[0013] FIG. 1 is a side cross-sectional view of a motor according to an embodiment. FIG. 2 is an enlarged view of FIG. 1, a cross-sectional view showing the positions of the bearing, the bearing housing, and the busbar holder, FIG. 3 is a drawing showing the busbar and busbar holder illustrated in FIG. 1. Fig. 4 is a plan view of the busbar, FIG. 5 is a drawing illustrating a third busbar, FIG. 6 is a drawing illustrating the first busbar and the third busbar, FIG. 7 is a drawing illustrating the second busbar and the third busbar, FIG. 8 is a cross-sectional view of a busbar and a busbar holder based on AA of FIG. 3. Specific details for implementing the invention

[0014] The direction parallel to the length direction (up-down direction) of the shaft is called the axial direction, the direction perpendicular to the axial direction with respect to the shaft is called the radial direction, and the direction following a circle with a radius in the radial direction with respect to the shaft is called the circumferential direction.

[0015] FIG. 1 is a side cross-sectional view of a motor according to an embodiment.

[0016] Referring to FIG. 1, the motor according to the embodiment may include a shaft (100), a rotor (200), a stator (300), a busbar (400), a busbar holder (500), a bearing (600), a bearing housing (700), and a housing (800). Hereinafter, "inner side" refers to the direction from the housing (800) toward the shaft (100), which is the center of the motor, and "outer side" refers to the opposite direction of the inner side, which is the direction from the shaft (100) toward the housing (800).

[0017] The shaft (100) can be coupled with the rotor (200). When an electromagnetic interaction occurs between the rotor (200) and the stator (300) through the supply of current, the rotor (200) rotates and the shaft (100) rotates in conjunction with it. The shaft (100) can be made of a hollow member.

[0018] The rotor (200) rotates through electrical interaction with the stator (300). The rotor (200) may be positioned corresponding to the stator (300) and may be positioned inside. The rotor (200) may include a magnet.

[0019] The stator (300) is positioned on the outside of the rotor (200). The stator (300) may include a stator core (310), an insulator (320), and a coil (330). The insulator (320) is seated on the stator core (310). The coil (330) is mounted on the insulator (320). The coil (330) causes electrical interaction with the magnet of the rotor (200).

[0020] The busbar (400) can be placed on the stator (300). The busbar (400) is electrically connected to the coil (330). The busbar (400) can also be connected to an external power source.

[0021] The busbar holder (500) supports the busbar (400). The busbar holder (500) may be an annular member containing the busbar (400) inside.

[0022] The bearing (600) rotatably supports the shaft (100).

[0023] The bearing housing (700) includes a bearing (600). The bearing housing (700) covers one open side of the housing (800).

[0024] The housing (800) may be positioned on the outside of the stator (300). The housing (800) may be a cylindrical member with one side open.

[0025] FIG. 2 is an enlarged view of X in FIG. 1, a cross-sectional view showing the positions of the bearing (600), the bearing housing (700), and the busbar holder (500).

[0026] Referring to FIG. 2, the bearing (600), the bearing housing (800), and the busbar holder (500) are arranged to overlap radially along the axis of the shaft (100). Thus, they can be positioned axially in the bearing housing (700) and in close proximity to the stator (300). With the bearing (600) and the bearing housing (700) positioned radially inside the busbar (400), the axial length of the motor can be reduced without reducing the size of the stator (300) and the rotor (200).

[0027] The configuration of the bearing (600), bearing housing (700), and busbar holder (500) for implementing these features is as follows.

[0028] The bearing housing (700) may include an inner portion (710), an outer portion (720), and a folding portion (730). The inner portion (710) is positioned to overlap the bearing (600) in the axial direction. The outer portion (720) is positioned radially to the outside of the bearing (600), with the outer end contacting the housing (800). The folding portion (730) connects the inner portion (710) and the outer portion (720). The folding portion (730) may be formed by bending the bearing housing (700) so that a portion of it is folded.

[0029] The folding portion (730) supports the bearing (600) while its inner surface contacts the outer ring of the bearing (600).

[0030] This folding portion (730) is positioned to overlap the bearing (600) and the busbar holder (500) in the radial direction of the shaft (100) axis. Additionally, the folding portion (730) may be positioned to overlap a part of the busbar (400) in the radial direction of the shaft (100) axis. Specifically, the folding portion (730) may be positioned between the bearing (600) and the busbar holder (500) in the radial direction of the shaft (100) axis. This is due to a configuration in which the bearing (600) and the folding portion (730) are positioned inside the busbar holder (500).

[0031] As the bearing (600) is positioned inside the busbar holder (500), the bearing housing (700) is also positioned axially close to the rotor (200) and the stator (300), so that the axial length of the motor can be reduced without reducing the axial length of the rotor (200) or the stator (300). Consequently, the shortest distance (L1) between the folding part (730) and the top of the insulator (320) becomes smaller than the shortest distance (L2) between the top of the busbar holder (500) and the insulator (320).

[0032] In order to position the bearing (600) and the folding part (730) inside the busbar holder (500), the radial width of the busbar holder (500) must be reduced. And the shape and arrangement of the busbar (400) corresponding to this must be implemented.

[0033] FIG. 3 is a drawing showing the busbar (400) and busbar holder (500) shown in FIG. 1, FIG. 4 is a plan view of the busbar (400), and FIG. 5 is a drawing showing the third busbar (400C).

[0034] Referring to FIGS. 3 to 5, the busbar (400) may include three busbars (400) in the U-phase, V-phase, and W-phase, and may include a first busbar (400A), a second busbar (400B), and a third busbar (400C) that extend circumferentially with respect to the axis of the shaft (100).

[0035] The first busbar (400A) has a first radius (R10) with respect to the axis of the shaft (100).

[0036] The second busbar (400B) has a second radius (R20) that is different from the first radius (R10) with respect to the axis of the shaft (100). For example, the second radius (R20) may be smaller than the first radius (R10).

[0037] The third busbar (400C) has a third radius (R30) with respect to the axis of the shaft (100). At this time, the third radius (R30) may have a value within the range of the first radius (R10) to the second radius (R20).

[0038] The third busbar (400C) may include a first body (410A), a second body (410B), and a bending portion (410C). The first body (410A) has a third radius (R30) with respect to the axis of the shaft (100) and has a third-1 radius (31). The second body (410B) has a third radius (R30) with respect to the axis of the shaft (100) and has a third-2 radius (32) that is different from the third-1 radius (31). For example, the third-1 radius (31) may be larger than the third-2 radius (32).

[0039] FIG. 6 is a drawing showing the first busbar (400A) and the third busbar (400C), and FIG. 7 is a drawing showing the second busbar (400B) and the third busbar (400C).

[0040] Referring to FIGS. 5 through 7, the busbar (400) may include a body (410) and a plurality of terminals (420) extending from the body (410). The body (410) may have a rounded shape formed along the circumferential direction. Some terminals (420A) may extend radially from the body (410) and be connected to the coil (330) of the stator (300). Additionally, other terminals (420B) may extend axially from the body (410) and be connected to an external power source. All terminals (420A) of the busbar (400) connected to the coil (330) may be arranged at the same position in the radial direction.

[0041] Referring to FIGS. 4 and 6, the first body (410A) of the third busbar (400C) may be positioned on the same circular track as the body (410) of the first busbar (400A). That is, the third radius (R30) may be the same as the first radius (R1) of the first busbar (410A) in the first region (S1) of the third busbar (410C), that is, the region where the first body (410A) is located. On the other hand, the second body (410B) of the third busbar (400C) may be positioned inside the body (410) of the first busbar (400A).

[0042] Accordingly, in the area of ​​the first busbar (400A) that overlaps with the third busbar (400C) in the radial direction, the terminals (420) of the third busbar (400C) can be extended and arranged to extend beyond the body (410) of the first busbar (400A). Therefore, when viewed from the axial direction, there exists an area where the terminals (420) of the third busbar (400C) and the body (410) of the first busbar (400A) overlap.

[0043] Referring to FIGS. 4 and 7, the second body (410B) of the third busbar (400C) may be positioned on the same circular track as the body (410) of the second busbar (400B). That is, the third radius (R30) may be the same as the second radius (R2) of the second busbar (410B) in the second region (S2) of the third busbar (410C), that is, the region where the second body (410B) is located.

[0044] On the other hand, the first body (410A) of the third busbar (400C) may be positioned outside the body (410) of the second busbar (400B). Accordingly, in the area of ​​the first busbar (400A) that overlaps with the second busbar (400B) in the radial direction, the terminals (420) of the second busbar (400B) may be extended and positioned to extend beyond the first body (410A) of the third busbar (400C). Therefore, when viewed from the axial direction, there exists an area where the first body (410A) of the third busbar (400C) and the terminals (420) of the third busbar (400C) overlap.

[0045] FIG. 8 is a cross-sectional view of a busbar (400) and a busbar holder (500) based on AA of FIG. 3.

[0046] The first busbar (400A), the second busbar (400B), and the third busbar (400C) are intended to reduce the radial width (W1) of the busbar holder (500). For example, although there are three busbars (400), the number of busbars (400) that overlap radially is reduced to two.

[0047] Referring to FIG. 8, the busbars (400) and the busbars (400) must be spaced apart by a certain distance in the radial direction. Therefore, as the number of busbars (400) arranged to overlap in the radial direction increases, the radial width (W1) of the busbar holder (500) increases. If the number of busbars (400) that overlap in the radial direction is reduced, the radial width (W1) of the busbar holder (500) can be reduced without reducing the radial widths (W2, W3) of the busbars (400).

[0048] Although three busbars (400) are provided, due to the structural features and arrangement of the third busbar (400C), the number of busbars (400) that overlap in the radial direction can be reduced to two. Therefore, the busbar holder (500) can significantly reduce the radial width (W1), thereby securing the inner space of the busbar holder (500) and allowing a part of the bearing (600) and bearing housing (700) to be placed inside the busbar holder (500).

[0049] The cross-sections of the second busbar (400B) and the third busbar (400C) shown in FIG. 8 are each part of the body (410), and the axial length (H2, H3) of the body (410) is formed to be longer than the radial width (W2, W3). In this case, the busbar (400) can be positioned so that the body (410) is upright. Also, the axial length (H1) of the busbar holder (500) is positioned to be larger than the radial width (W1).

[0050] Although the aforementioned embodiments describe an inner rotor type motor as an example, they are not limited thereto. The present invention is also applicable to outer rotor type motors. Furthermore, it can be used in various devices, such as automobiles or home appliances. Explanation of the symbols

[0051] 100: Shaft 200: Rotor 300: Status 400: Busbar 400A: 1st busbar 400B: 2nd busbar 400C: 3rd busbar 410: Body 420: Terminal 410A: 1st body 410B: Second body 410C: Banding section 500: Busbar holder 600: Bearing 700: Bearing housing 800: Housing

Claims

Claim 1 A motor comprising: a shaft; a rotor coupled to the shaft; and a stator disposed corresponding to the rotor, a busbar disposed on the stator and a busbar holder supporting the busbar, a bearing supporting the shaft and a bearing housing supporting the bearing, wherein the bearing, the bearing housing, and the busbar holder are disposed to overlap radially along the axis of the shaft. Claim 2 A motor comprising: a shaft; a rotor coupled to the shaft; and a stator disposed corresponding to the rotor, and a bus bar disposed on the stator, wherein the bus bar comprises a first body having a third-1 radius with respect to the axis of the shaft, a second body having a third-2 radius different from the third-1 radius, and a bending portion connecting the first body and the second body. Claim 3 A motor comprising: a shaft; a rotor coupled to the shaft; and a stator disposed corresponding to the rotor, and a busbar disposed on the stator, wherein the busbar comprises a first busbar, a second busbar, and a third busbar extending circumferentially with respect to the axis of the shaft, wherein with respect to the axis of the shaft, the first busbar has a first radius, the second busbar has a second radius different from the first radius, and the third busbar has a third radius which is the distance between the first radius and the second radius. Claim 4 In claim 1, a portion of the bearing housing is positioned between the bearing and the busbar holder in the radial direction of the shaft axis of the motor. Claim 5 In claim 1, a portion of the bearing housing is positioned to overlap with the bus bar in the radial direction of the shaft axis of the motor. Claim 6 In claim 1, the stator comprises a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator, wherein the shortest distance between the bearing housing and the insulator is smaller than the shortest distance between the top of the busbar holder and the insulator. Claim 7 In claim 2, the busbar comprises a first busbar, a second busbar, and a third busbar extending in a circumferential direction with respect to the axis of the shaft, wherein the first busbar comprises the first body, the second body, and the bending portion, the second busbar is disposed inside the first body, and the third busbar is disposed outside the second body. Claim 8 In claim 3, the third radius is the same as the first radius in the first region of the third busbar and the same as the second radius in the second region of the third busbar. Claim 9 A motor according to any one of claims 1 to 3, wherein the busbar comprises a body and a terminal extending from the body, and the bodies of a plurality of the busbars are arranged to overlap each other in the radial direction of the axis of the shaft. Claim 10 In claim 1, the busbar holder is a motor in which the radial width is smaller than the axial length with respect to the axis of the shaft.

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