CN116648558A

CN116648558A - motor

Info

Publication number: CN116648558A
Application number: CN202180072344.1A
Authority: CN
Inventors: 洪训技; 金奉建
Original assignee: LG Innotek Co Ltd
Current assignee: LG Innotek Co Ltd
Priority date: 2020-10-22
Filing date: 2021-10-21
Publication date: 2023-08-25
Also published as: KR20220055531A

Abstract

The present invention may provide a motor including: a shaft; a rotor coupled to the shaft; and a stator provided to correspond to the rotor. The stator includes: a stator core; an insulator coupled to the stator core; a coil disposed on the insulator; a busbar electrically connected to the coil; and a bus bar bracket supporting the bus bar. The insulator includes a first spherical surface, the busbar bracket includes a second spherical surface in contact with the first spherical surface, and the first spherical surface and the second spherical surface are disposed in an overlapping region of the insulator and the busbar bracket in a radial direction.

Description

Motor

Technical Field

The present invention relates to a motor.

Background

The motor includes a rotor and a stator. The stator may include a stator core, an insulator mounted on the stator core, and a coil wound on the insulator.

The connection end of the coil may be connected to a busbar. The bus is supported by a bus bar holder (busbar holder). The bus bar bracket may be disposed at one side of the stator.

In order to fix the bus bar and prevent vibration of the bus bar, the bus bar holder may be in contact with the insulator. For example, a protrusion may be formed on a lower surface of the bus bar bracket, and a groove may be formed in an upper end of the inner side guide of the insulator, so that the bus bar bracket may be fixed to the stator using a coupling structure using the groove and the protrusion.

However, the fixing structure of the bus bar bracket and the insulator is such that: in which the bus bar holder is provided on the insulator in the axial direction, and a gap is inevitably generated between the bus bar holder and the insulator in the axial direction, the radial direction, the circumferential direction, etc., there is a problem in that vibrations may occur.

In addition, there is a problem in that poor connection between the stator coil and the bus bar occurs due to axial vibration.

Disclosure of Invention

Technical problem

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a motor in which the occurrence of a gap in a fixing structure of a bus bar bracket and an insulator is reduced.

In addition, the present invention is directed to providing a motor in which poor connection between a stator and a bus bar due to axial vibration is prevented by increasing a fixing force between the stator and the bus bar.

The objects to be achieved by the present invention are not limited to the above objects, and other objects not described above should be clearly understood by those skilled in the art from the following description.

Technical proposal

An aspect of the present invention provides a motor including a shaft, a rotor coupled to the shaft, and a stator arranged to correspond to the rotor, wherein the stator includes a stator core, an insulator coupled to the stator core, and a coil provided on the insulator, the coil is electrically connected to a bus bar supported by a bus bar bracket including a first spherical surface, the bus bar bracket includes a second spherical surface in contact with the first spherical surface, and the first and second spherical surfaces are arranged in an overlapping region of the insulator and the bus bar bracket in a radial direction.

Either one of the first spherical surface and the second spherical surface may be a convex spherical surface, and the other may be a concave spherical surface.

The first spherical surface may be disposed on a guide of the insulator and the second spherical surface may be disposed on an inner surface of the extension of the bus bar bracket.

The radius of the first sphere and the radius of the second sphere may be less than the radial thickness of the guide.

The extension may include a protrusion, the guide may include a first groove, the first spherical surface may be disposed on the protrusion, and the second spherical surface may be disposed in the first groove.

Another aspect of the present invention provides a motor including a shaft, a rotor coupled to the shaft, and a stator arranged to correspond to the rotor, wherein the stator includes a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator, the coil being electrically connected to a busbar supported by a busbar support, the insulator including a guide including a first surface, the busbar support including an extension including a second surface in contact with the first surface, the guide including a first groove disposed in the first surface, the extension including a protrusion disposed on the second surface, the protrusion and the first groove forming a contact area having a curved shape.

The guide may include a second groove connecting an edge of the guide with the first groove.

The circumferential maximum length of the first groove may be greater than the circumferential maximum length of the second groove, and the radial maximum length of the first groove may be greater than the radial maximum length of the second groove.

The circumferential maximum length of the first groove may be less than the radial thickness of the guide.

The extension may include a chamfer provided at a lower portion of the extension.

A further aspect of the present invention provides a motor including a shaft, a rotor coupled to the shaft, a stator arranged to correspond to the rotor, and a bearing supporting the shaft, wherein the stator includes a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator, the coil being electrically connected to a busbar supported by a busbar support including a first portion in which the busbar is disposed, a second portion supporting the bearing, and at least one third portion extending from the first portion toward the stator, the third portion including a protrusion protruding in a radial direction, the insulator including a stepped portion in contact with the protrusion.

The motor may include a housing that houses a stator, wherein the first portion may be coupled to the housing.

The second portion may be disposed further inward than the stator and the third portion may be disposed further outward than the stator.

The third portion may be disposed a first distance from an outer edge of the first portion, and the third portion may be disposed a second distance from the second portion, which may be greater than the first distance.

The first portion may include at least one aperture formed inwardly from the third portion.

The motor may include a first terminal disposed between the bus bar and the stator, wherein the first terminal may be electrically connected to the coil, and the bus bar may include a first end portion contacting the first terminal.

The third portion may include a 3A portion and a 3B portion, the 3B portion being circumferentially spaced apart from the 3A portion, and the at least one first end portion may be disposed between the 3A portion and the 3B portion.

The third portion may include a leg portion connecting the first portion and the protrusion, and a radial width of the leg portion may decrease toward the protrusion.

The leg portion may include a first surface disposed to face inwardly and a second surface disposed to face outwardly, wherein the first surface may form a first angle with respect to one surface of the first portion, the second surface may form a second angle with respect to one surface of the first portion, and the first angle and the second angle may be different.

The ratio of the minimum width to the maximum width of the leg portion may be in the range of 0.4 to 0.6.

Advantageous effects

According to the embodiment, an advantageous effect of preventing a gap from being generated in any direction in the fixing structure of the bus bar bracket and the insulator is provided.

According to the embodiment, since there is no gap between the bus bar bracket and the insulator, an advantageous effect of preventing foreign matter from being introduced between the bus bar bracket and the insulator is provided.

According to the embodiment, an advantageous effect of facilitating switching and correcting the fixing direction during fixing of the busbar bracket to the insulator is provided.

According to the embodiment, poor connection of the stator and the bus bar due to axial vibration can be prevented by improving the axial fixing force between the bus bar bracket and the stator.

In particular, the phenomenon that the bus bar is separated from the stator can be prevented by generating stress of a wave washer supporting the bearing in the axial direction.

Drawings

Fig. 1 is a view illustrating a motor according to an embodiment.

Fig. 2 is a perspective view illustrating a bus bar bracket and a stator.

Fig. 3 is a view illustrating an insulator.

Fig. 4 is a cross-sectional view illustrating an inner guide of the insulator along line A-A of fig. 3.

Fig. 5 is a side view illustrating an insulator.

Fig. 6 is a view illustrating the size of the first groove and the size of the second groove.

Fig. 7 is a plan view illustrating a second groove of the insulator.

Fig. 8 is a view illustrating a bus bar bracket.

Fig. 9 is a view illustrating an extension and a protrusion of the insulator shown in fig. 8.

Fig. 10 is a view illustrating a lower surface of the bus bar bracket shown in fig. 8.

Fig. 11 is a view illustrating a process of fixing the bus bar bracket to the insulator.

Fig. 12 is a sectional view illustrating a motor according to another embodiment.

Fig. 13 is a perspective view illustrating a bus bar and a bus bar bracket.

Fig. 14 is a bottom view illustrating a bus bar and a bus bar bracket.

Fig. 15 is a side view illustrating a stator, a bus bar, and a bus bar bracket.

Fig. 16 is a perspective view illustrating the upper insulator.

Fig. 17 is a view illustrating a portion in which the coil, the first terminal, and the bus bar are connected.

Fig. 18 is a sectional view illustrating a bus bar bracket.

Fig. 19 is a bottom view illustrating the bus bar bracket.

Fig. 20 and 21 are views illustrating a third portion.

Fig. 22 is a view illustrating a portion in which the outer guide is in contact with the third portion.

Detailed Description

Referring to fig. 1, a motor according to an embodiment may include a shaft 100, a rotor 200, a stator 300, a bus bar 400, a bus bar bracket 500, and a housing 600. Hereinafter, the term "inward" refers to a direction from the housing 600 toward the shaft 100 as the center of the motor, and the term "outward" refers to a direction opposite to "inward", i.e., a direction from the shaft 100 toward the housing 600.

Shaft 100 may be coupled to rotor 200. When electromagnetic interaction occurs between the rotor 200 and the stator 300 by supplying current, the rotor 200 rotates, and the shaft 100 rotates together with the rotor 200. The shaft 100 may be rotatably supported by bearings.

The rotor 200 rotates due to electrical interaction with the stator 300. The rotor 200 may be disposed to correspond to the stator 300, and may be disposed inside the stator 300. The rotor 200 may include a rotor core and a magnet disposed on the rotor core. In this case, the rotor 200 may be a Surface Permanent Magnet (SPM) type rotor in which magnets are disposed on an outer circumferential surface of a rotor core, or an Inner Permanent Magnet (IPM) type rotor in which magnets are disposed inside the core of the rotor 200.

The stator 300 is disposed outside the rotor 200. The stator 300 may include a stator core 310, an insulator 320, and a coil 330. The coil 330 may be wound around the insulator 320. An insulator 320 is disposed between the coil 330 and the stator core 310 to electrically insulate the stator core 310 from the coil 330. The coils 330 cause electrical interactions with the magnets of the rotor 200.

The bus bar 400 may be disposed above the stator 300. The bus bar 400 is electrically connected with the coil 330. In addition, the bus bar 400 may be connected to an external power source. Three bus bars 400 may be provided that are connected to a power source having a U-phase, a V-phase, and a W-phase.

The bus bar bracket 500 supports the bus bar 400. The bus bar bracket 500 may be an annular member that includes the bus bar 400 inside thereof.

Fig. 2 is a perspective view illustrating the bus bar bracket 500 and the stator 300, fig. 3 is a view illustrating the insulator 320, and fig. 4 is a sectional view illustrating an inner guide of the insulator 320 along a line A-A of fig. 3.

Referring to fig. 2 and 3, a bus bar bracket 500 is disposed above the stator 300. The bus bar bracket 500 may be fixed to the insulator 320. When the bus bar bracket 500 is fixed to the insulator 320, in a state where the bus bar bracket 500 and the insulator 320 overlap in the radial direction, the contact surfaces are formed in a spherical surface, and the bus bar bracket 500 and the insulator 320 are constrained to each other in all directions such as the axial direction, the circumferential direction, and the radial direction, so there is an advantage in that a gap generated between the bus bar bracket 500 and the insulator 310 is significantly reduced.

The structures of the insulator 320 and the bus bar bracket 500 for forming the contact surfaces of the bus bar bracket 500 and the insulator 320 into spherical surfaces are as follows.

Referring to fig. 3 and 4, the insulator 320 includes a first groove G1 and a second groove G2, and the second groove G2 includes a concave first spherical surface S1. The first groove G1 serves to guide the protrusion 511 of the bus bar bracket 500 into, and the second groove G2 serves to fix the bus bar bracket 500 and the insulator 320 by being coupled to the protrusion 511. The first groove G1 and the second groove G2 are connected. The first groove G1 and the second groove G2 may be concavely formed in the guide 321A or 321B of the insulator 320. For example, the first groove G1 and the second groove G2 may be concavely formed in the outer surface of the inner guide 321A of the insulator 320.

The second groove G2 may be disposed to be spaced apart from an edge of the inner guide 321A, and the first groove G1 may be connected to the second groove G2 from the edge of the inner guide 321A. The first groove G1 and the second groove G2 may be disposed at the middle of the circumferential width of the inner guide 321A.

The first and second grooves G1 and G2 are illustrated as being provided in the inner guide 321A, but they are not limited thereto, and the first and second grooves G1 and G2 may be provided in the inner surface of the outer guide 320B of the insulator 320.

The insulator 320 may include an upper insulator 320A and a lower insulator 320B. The upper insulator 320A may be coupled to one side of the stator core 310, and the lower insulator 320B may be coupled to the other side of the stator core 310. The first and second grooves G1 and G2 may be provided only in the upper insulator 320A near the bus bar bracket 500. Thus, the shape of the upper insulator 320A and the shape of the lower insulator 320B may be different. Meanwhile, when the bus bar 400 is disposed near the lower insulator 320B, the first and second grooves G1 and G2 may be disposed only in the lower insulator 320B.

In addition, the first groove G1 and the second groove G2 may also be provided in the lower insulator 320B and in the upper insulator 320A, in which case the shape of the upper insulator 320A and the shape of the lower insulator 320B may be the same.

Fig. 5 is a side view illustrating the insulator 320, and fig. 6 is a view illustrating the size of the first groove G1 and the size of the second groove G2.

Referring to fig. 4 to 6, an axial length H2 of the inner guide 321A may be greater than an axial length H1 of the outer guide 321B. The inner guide 321A may be divided into a first portion 321Aa corresponding to the outer guide 321B, and a second portion 321Ab extending to the first portion 321Aa in the axial direction. At least a portion of the second portion 321Ab may be disposed to overlap with the extension 510 of the busbar holder 500 in the radial direction. The second portion 321Ab may include a first surface 301 that contacts the busbar holder 500, and the first groove G1 and the second groove G2 may be provided in the first surface 301.

Meanwhile, the radius R1 of the first spherical surface S1 may be smaller than the radial maximum thickness t of the inner guide 321A. For example, when the radial maximum thickness t of the inner guide 321A is 1.5mm, the radius R1 of the first spherical surface S1 may be 1mm. In addition, the circumferential maximum length W1 of the first groove G1 may be smaller than the radial maximum thickness t of the inner guide 321A.

The circumferential maximum length W1 of the first groove G1 may be greater than the circumferential maximum length W2 of the second groove G2. In addition, the radial maximum length L1 of the first groove G1 may be greater than the radial maximum length L2 of the second groove G2. In this case, the radial maximum length L1 of the first groove G1 may be the same as the radius R1 of the first spherical surface S1. Due to such a difference, the protrusion 511 of the extension 510 provided in the first groove G1 can be completely prevented from coming out of the first groove G1 in the axial direction.

Fig. 7 is a plan view illustrating the second groove G2 of the insulator 320.

Referring to fig. 7, corners G2a of both sidewalls of the second groove G2 may be formed in a circular shape. In fixing the bus bar bracket 500 to the insulator 320, the protrusion 511 of the bus bar bracket 500 moves to the first groove G1 along the second groove G2, and the rounded corner G2a has an advantage of guiding the protrusion 511 to be smoothly inserted into the second groove G2. Considering the hemispherical shape of the protrusion 511, the rounded corner G2a is an advantageous structure for guiding the protrusion 511.

Fig. 8 is a view illustrating a bus bar bracket 500, and fig. 9 is a view illustrating an extension 510 and a protrusion 511 of the insulator 320 shown in fig. 8.

Referring to fig. 8 and 9, the bus bar bracket 500 may include an extension 510 and a protrusion 511. The extension 510 is provided to protrude from the lower surface 501 of the bus bar bracket 500. Extension 510 includes a second surface 502 that contacts first surface 301 of insulator 320. In addition, a protrusion 511 is provided to protrude from the second surface 502 in the radial direction. The protrusion 511 includes a convex second spherical surface S2. The protrusion 511 may be disposed at the middle of the circumferential width of the extension 510. The protrusion 511 is disposed in the first groove G1 so as to form a contact area having a curved shape with the first groove G1, and thus, the bus bar holder 500 and the insulator 320 are fixedly restrained from each other in all directions such as an axial direction, a circumferential direction, and a radial direction.

The chamfer 512 may be disposed around a corner formed by the second surface 502 and the lower surface of the extension 510. When the extension 510 overlaps the inner guide 321A so that the first surface 301 and the second surface 502 contact each other, the chamfer 512 guides the extension 510 to smoothly move along the inner guide 321A.

Fig. 10 is a view illustrating a lower surface of the bus bar bracket 500 shown in fig. 8.

Referring to fig. 10, the plurality of extensions 510 may be arranged at predetermined intervals in the circumferential direction around the center C of the bus bar bracket 500. These extensions 510 may be arranged at equal intervals based on the circumferential direction. The radius R2 of the extension 510 from the center C of the bus bar bracket 500 may be greater than the radius R1 of the inner circumferential surface of the bus bar bracket 500. The extension 510 may be positioned further outside than the inner circumferential surface of the bus bar bracket 500 in consideration of the position of the protrusion 511 and the position of the inner guide 321A of the insulator 320.

Fig. 11 is a view illustrating a process of fixing the bus bar bracket 500 to the insulator 320.

Referring to fig. 11, when the bus bar bracket 500 moves downward from the upper side of the insulator 320, the protrusion 511 contacts the second groove G2 and is guided to the first groove G1. Since the protrusion 511 is guided by the second groove G2, even when the assembling direction of the bus bar bracket 500 and the insulator 320 is slightly misaligned, the assembling direction can be naturally adjusted and aligned. In this case, the extension 510 may be disposed outside the inside guide 321A, and the extension 510 may be in a state of being elastically deformed outwardly by being pushed by the second groove G2.

When the protrusion 511 moves along the second groove G2 and is positioned in the first groove G1, the extension 510 and the inner guide 321A are arranged to overlap in the radial direction, the protrusion 511 and the second groove G2 engage with each other, and thus, the bus bar bracket 500 is fixed to the insulator 320. Since the contact area of the protrusion 511 with the second groove G2 forms a spherical surface, a stable fixing force is ensured without any gap in all directions such as the axial direction, the circumferential direction, and the radial direction.

Referring to fig. 12, the motor 110 may include a housing 1110, a shaft 1120, a bearing 1130, a rotor 1140, a stator 1150, a bus 1160, a bus bracket 1170, and a gear portion 1180.

The housing 1110 may form the exterior of the motor 110. The housing 1110 can include a motor housing 1111 and a pump housing 1112. The motor housing 1111 may house the rotor 1140, the stator 1150, the bus bars 1160, and the bus bar holders 1170 therein. In addition, the pump housing 1112 may house the gear portion 1170 therein.

The shaft 1120 may be disposed inside the motor housing 1111 and the pump housing 1112. In the housing 1110, holes may be formed in the motor housing 1111 and the pump housing 1112. The shaft 1120 may pass through the hole. The hole may have a shape corresponding to the diameter of the shaft 1120.

The bearing 1130 may rotatably support the shaft 1120. The bearings 1130 may include a first bearing 1131 and a second bearing 1132. The first bearing 1131 and the second bearing 1132 may be spaced apart from each other by the stator 1150 interposed therebetween in the axial direction. The first bearing 1131 may be disposed in the housing 1110. In addition, a second bearing 1132 may be disposed in the buss bar support 1170. In this case, a wave washer W may be disposed between the first bearing 1131 and the housing 1110. In the wave washer W, stress may be generated in the axial direction.

The rotor 1140 is coupled to a shaft 1120. The rotor 1140 rotates due to electrical interaction with the stator 1150. The rotor 1140 may be disposed to correspond to the stator 1150 and may be disposed inside the stator 1150.

The stator 1150 is arranged to correspond to the rotor 1140. In addition, the stator 1150 may be fixed to the housing 1110. The stator 1150 may include a stator core 1151, a coil 1152, and an insulator 1153 mounted on the stator core 1151. The coil 1152 may be wound on an insulator 1153. An insulator 1153 is provided between the coil 1152 and the stator core 1151. Coil 1152 causes an electrical interaction with the magnets of rotor 1130.

The bus bars 1160 may be electrically connected to coils of the stator 1150. The buss bar 1160 may be electrically connected to power terminals (not shown) of the U-, V-, and W-phases. A busbar bracket 1170 may be disposed above the stator 1150. The buss bar support 1170 may be an annular molded member.

The gear portion 1180 may be coupled to the shaft 1120. The gear portion 1180 may include an inner gear and an outer gear. In this case, the internal gear may be coupled to the shaft 1120 and rotate. The internal gear may have a predetermined eccentric structure. Due to such eccentricity, a space through which the fluid fuel flows is created between the inner gear and the outer gear. Thus, during the rotational movement, the volume increasing portion sucks in surrounding fluid due to the decrease in pressure, and the volume decreasing portion discharges fluid due to the increase in pressure. Any known gear structure may be applied to the structure of the gear portion, and further detailed description will be omitted.

Fig. 13 is a perspective view illustrating a bus bar and a bus bar bracket.

Referring to fig. 13, the buss bar 1160 and the buss bar support 1170 may be integrally formed. The buss bar support 1170 can include a first portion 1171, a second portion 1172, and a third portion 1173.

The first portion 1171 may be an annular member. The buss bar 1160 may be disposed on the first portion 1171. The first portion 1171 may be spaced apart from the stator 1150 in an axial direction. The first portion 1171 can be coupled to the housing 1110. Thus, the buss bar support 1170 can cover the upper portion of the housing 1110.

The second portion 1172 may be disposed centrally of the first portion 1171. The second portion 1172 may form a bearing receptacle portion 1172P in which the bearing 1130 is disposed. The outer circumferential surface of bearing 1130 may be in contact with second portion 1172.

The third portion 1173 may extend from the first portion 1171 toward the stator 1150. The end portions of the third portion 1173 may be disposed closer to the stator 1150 than the cross-sections of the first portion 1171 and the second portion 1172. In addition, the third portion 1173 can include a protrusion 1732. The protrusion 1732 may be provided on an end portion of the third portion 1173. The protrusion 1732 may protrude in a radial direction. In this case, the protrusion 1732 may be fixedly hooked to the insulator 1153.

The buss bars 1160 may be provided as a plurality of buss bars 1160. In addition, each of the plurality of buss bars 1160 may include a first end portion 1161. The first end portion 1161 may be exposed from the first portion 1171. In addition, the first end portion 1161 may be connected to a first terminal T to be described below.

Fig. 14 is a bottom view illustrating a bus bar and a bus bar bracket.

Referring to fig. 14, a lower surface 1171A of the first portion 1171 faces the stator 1150. In this case, the third portion 1173 may be disposed on the lower surface 1171A of the first portion 1171. The third portion 1173 may be provided as a plurality of third portions 1173. The number of third portions 1173 may be 6. In this case, the plurality of third portions 1173 may be arranged to be spaced apart from each other in the circumferential direction with respect to the axial center. The first portion 1171 can include a plurality of holes 1171H formed inwardly from the third portion 1173. In addition, the third portion 1173 may include a 3A portion 1173A and a 3B portion 1173B. The 3A portion 1173A and the 3B portion 1173B may be spaced a predetermined distance from each other in the circumferential direction.

The first end portion 1161 protrudes from a lower surface 1171A of the first portion 1171. The first end portion 1161 may be provided as a plurality of first end portions 1161. In addition, at least one first end portion 1161 may be disposed between the 3A portion 1173A and the 3B portion 1173B. The plurality of first end portions 1161 may be arranged to be spaced apart from each other in a circumferential direction with respect to the axial center.

Fig. 15 is a side view illustrating a stator, a bus bar, and a bus bar bracket.

Referring to fig. 15, a busbar bracket 1170 may be provided to be coupled to the stator 1150. In this case, the first portion 1171 may be disposed above the stator 1150. The first portion 1171 may be spaced apart from an upper end of the stator 1150. Additionally, a third portion 1173 may extend downwardly from the first portion 1171. In addition, the protrusion 1732 of the third portion 1173 may be secured to the insulator 1153. In this case, the insulator 1153 may include a stepped portion to which the protrusion 1732 is fastened.

Fig. 16 is a perspective view illustrating the upper insulator.

Referring to fig. 16, the insulator 1153 may include an upper insulator 1153A disposed on the stator core 1151. Referring to fig. 16, the upper insulator 1153A may include an inner guide 1153G1, a body 1153B, and an outer guide 1153G2.

The coil may be wound on the body 1153B. The body 1153B may be disposed on the stator core 1151 to insulate the stator core 1151 from the coil 1152. The inner guide 1153G1 supports the coil 1152 wound on the body 1153B to prevent the coil 1152 from being detached inward. In addition, the outer guide 1153G2 supports the coil 1152 wound on the body 1153B to prevent the coil 1152 from being detached outward.

A plurality of grooves G are formed in the outer peripheral surface of the outer guide 1153G2. In this case, the groove G may be disposed above the stator core 1151. A protrusion 1732 is disposed in each groove G. In addition, the outer guide 1153G2 includes a stepped portion R provided at an upper side of the groove G. The stepped portion R contacts the protrusion 1732. In this case, the protrusion 1732 may be fixedly hooked on the stepped portion R. The grooves G and the stepped portions R are provided as a plurality of grooves G and a plurality of stepped portions R, respectively. The number of grooves G and the number of steps R may be the same as the number of third portions 1173. The plurality of grooves G and the plurality of stepped portions R may be arranged to be spaced apart from each other in a circumferential direction with respect to the axial center. The width of the groove G may be greater than the width of the protrusion 1732.

The outer guide 1153G2 may include a slot S disposed to face upward. In addition, the outer guide 1153G2 may include a boss B surrounding the slot S. A first terminal 1190, which will be described below, may be disposed in the slot S. In this case, boss B may guide insertion of first terminal 1190 into slot S. The slot S and the boss B may be provided as a plurality of slots S and a plurality of bosses B, respectively. In addition, the plurality of slots S and the plurality of bosses B may be spaced apart from each other in a circumferential direction with respect to the axial center. At least one slot S and at least one boss B may be disposed between the plurality of grooves G.

Fig. 18 is a view illustrating a portion in which the coil, the first terminal, and the bus bar are connected.

Referring to fig. 18, the motor 1110 may further include a first terminal 1190 disposed between the stator 1150 and the bus bar 1160. First terminal 1190 may be electrically connected to coil 1151. In addition, the first terminal 1190 may include a first well 1191. The coil 1151 may be press fit into the first well 1191. In this case, the first terminal 1190 may fixedly press the coil 1151 extending upward from the stator 1150. In this case, the first terminal 1190 may be a magnetically mated terminal. The first terminal 1190 may be disposed in the slot S. In this case, a gap may be formed between the boss B and the first terminal 1190.

First end portion 1161 may be electrically connected to coil 1152 through first terminal 1190. First end portion 1161 may be in contact with first terminal 1190. In this case, the first end portion 1161 may be disposed in a gap formed between the boss B and the first terminal 1190.

Fig. 18 is a sectional view illustrating a bus bar bracket.

Referring to fig. 18, the second portion 1172 is disposed inside the first portion 1171. The lower end of the second portion 1172 may be disposed at a lower level than the lower surface of the first portion 1171. In addition, a third portion 1173 is disposed outside of the second portion 1172. In this case, the lower end of the third portion 1173 may be disposed at a lower level than the lower end of the second portion 1172.

Bearing receptacle 1172P may be formed in second portion 1172. The bearing 1130 is disposed in the bearing receptacle 1172P. In addition, a through hole 172H may be formed in the second portion 1172, the through hole 172H communicating to the bearing housing portion 1172P. In this case, the second portion 1172 may support the bearing 1130 in the radial direction and the axial direction.

Fig. 19 is a bottom view illustrating the bus bar bracket.

Referring to fig. 19, a plurality of third portions 1173 may be disposed on the same circumferential line with respect to the axial center C. In this case, the distance from the axial center C to the 3A portion 1173A is the same as the distance from the axial center C to the 3B portion 1173B. The third portion 1173 may be disposed a first distance D1 from an outer edge of the first portion 1171. Additionally, the third portion 1173 may be disposed a second distance D2 from the second portion 1172. In this case, the second distance D2 may be greater than the first distance D1.

Fig. 20 and 21 are views illustrating a third portion.

Referring to fig. 20, the third portion 1173 can include a leg portion 11731 and a projection 11732.

The leg portion 11731 can extend from the first portion 1171. Leg portion 11731 connects first portion 1171 and projection 11732. The leg portion 11731 can have a length L1 that is greater than an axial distance between the first portion 1171 and the insulator 1153. In this case, the leg portion 11731 can have a first width W11 in the radial direction. In addition, in the leg portion 11731, the first width W11 can be reduced toward the projection 11732. The leg portion may have a maximum width W in a radial direction _max And a minimum width W _min . Maximum W with leg portions 11731 _max May be the portion connected to the first portion 1171. In addition, in the case of the optical fiber,minimum width W of leg portion 11731 _min May be the portion connected to the protrusion 11732. In this case, the minimum width W _min And maximum width W _max The ratio of (c) may be in the range of 0.4 to 0.6.

Referring to fig. 21, the leg portion 11731 can include a first surface 1731A and a second surface 1731B. First surface 1731A and second surface 1731B extend from a lower surface of first portion 1171. In this case, the first surface 1731A is provided to face inward. In addition, the second surface 1731B is provided to face outward. The first surface 1731A or the second surface 1731B of the leg portion may be disposed to be inclined with respect to the lower surface of the first portion 1171. In this case, first surface 1731A may be disposed at a first angle +.a1 relative to the lower surface of first portion 1171. In addition, second surface 1731B may form a second angle +.a2 with respect to the lower surface of first portion 1171. In addition, the first angle +.a1 and the second angle +.a2 can be different. The first angle +.a1 can be in the range of 87 to 92 degrees. Meanwhile, the second angle +.a2 may be in the range of 93 to 100 degrees.

Fig. 22 is a view illustrating a portion of the outer guide in contact with the third portion.

Referring to fig. 22, a protrusion 11732 can extend from an end portion of the leg portion 11731. The protrusion 11732 can include a third surface 1732C in contact with the stepped portion R.

Third surface 1732C may be coupled to first surface 1731A. In this case, the first surface 1731A may be spaced apart from the outer guide 1153G2. In addition, only a portion of the protrusion 11732 may be disposed in the groove G. Thus, a portion of the third surface 1732C may not contact the stepped portion R. The third surface 1732C may include a first area A1 contacting the stepped portion R and a second area A2 as a remaining area of the third surface 1732C. The area of the second region A2 may be larger than that of the first region A1. In addition, the axial length L2 of the protrusion 11732 can be smaller than the axial length of the groove G. Thus, the end portion of the protrusion 11732 can be spaced apart from the upper surface of the stator core 1151.

Such a motor has the following structure: wherein the bus bar bracket and the insulator are fixedly fastened to each other, and a fixing force between the stator and the bus bar can be increased, thereby preventing poor connection between the stator and the bus bar due to axial vibration. In particular, the phenomenon that the conventional bus bar is completely separated from the stator can be prevented by generating stress of the wave washer supporting the bearing in the axial direction.

In the above-described embodiment, an example of the inner rotor type motor has been described, but the present invention is not limited thereto. The present invention can also be applied to an outer rotor type motor. In addition, the present invention may be used in various devices such as vehicles or home appliances.

Claims

1. A motor, comprising:

a shaft;

a rotor coupled to the shaft; and

a stator arranged to correspond to the rotor,

wherein the stator includes a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator,

the coil is electrically connected to a bus bar,

the bus bar is supported by a bus bar bracket,

the insulator comprises a first spherical surface,

the busbar bracket includes a second spherical surface in contact with the first spherical surface, and

the first spherical surface and the second spherical surface are disposed in an overlapping region of the insulator and the busbar bracket in a radial direction.

2. The motor of claim 1, wherein:

either one of the first spherical surface and the second spherical surface is a convex spherical surface; and is also provided with

The other of the two is a concave spherical surface.

3. The motor of claim 1, wherein:

the first spherical surface is arranged on a guide of the insulator; and is also provided with

The second spherical surface is disposed on an inner surface of the extension of the busbar bracket.

4. A motor, comprising:

a shaft;

a rotor coupled to the shaft; and

a stator arranged to correspond to the rotor,

the coil is electrically connected to a bus bar,

the bus bar is supported by a bus bar bracket,

the insulator includes a guide including a first surface,

the bus bar bracket includes an extension portion including a second surface in contact with the first surface,

the guide includes a first recess disposed in the first surface,

the extension includes a protrusion disposed on the second surface, and

the protrusion and the first groove form a contact area having a curved shape.

5. The motor of claim 4, wherein the guide includes a second groove connecting an edge of the guide with the first groove.

6. A motor, comprising:

a shaft;

a rotor coupled to the shaft;

a stator arranged to correspond to the rotor; and

a bearing, said bearing supporting said shaft,

the coil is electrically connected to a bus bar,

the bus bar is supported by a bus bar bracket,

the busbar bracket includes a first portion in which the busbar is disposed, a second portion supporting the bearing, and at least one third portion extending from the first portion toward the stator,

the third portion includes a protrusion protruding in a radial direction, and

the insulator includes a stepped portion in contact with the protrusion.

7. The motor according to claim 6, comprising a housing accommodating the stator,

wherein the first portion is coupled to the housing.

8. The motor of claim 6, wherein:

the second portion is disposed further inward than the stator; and is also provided with

The third portion is disposed further outwardly than the stator.

9. The motor of claim 6, wherein:

the third portion is disposed a first distance from an outer edge of the first portion;

the third portion is disposed a second distance from the second portion; and is also provided with

The second distance is greater than the first distance.

10. The motor of claim 6, wherein the first portion includes at least one aperture formed inwardly from the third portion.