KR20220051615A - Motor - Google Patents

Abstract

The present invention provides a motor which comprises: a shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; a bus bar disposed on the stator; a bus bar holder supporting the bus bar; a bearing supporting the shaft; and a bearing housing supporting the bearing. The bearing, the bearing housing, and the bus bar holder are disposed to overlap in a radial direction of an axis of the shaft.

Description

motor {Motor}

The embodiment relates to a motor.

In general, in a motor, the rotor is rotated by electromagnetic interaction between the rotor and the stator. At this time, the shaft connected to the rotor also rotates to generate rotational driving force.

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

The stator may include a stator core and a coil wound around the stator core. The coil may be connected to the busbar. The busbar is supported by the busbar holder. As the bus bar, three bus bars of U-phase, V-phase, and W-phase may be provided. When these three bus bars are aligned with respect to the radial direction of the shaft axis, there is a problem in that the radial width of the bus bar holder increases, thereby causing a design limitation of the motor.

Accordingly, the embodiment is intended to solve the above problems, and it is a task to provide a motor advantageous for design by reducing the radial width of the bus bar holder.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

An embodiment includes a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, and a bus bar disposed on the stator and a bus bar holder supporting the bus bar, The motor may include a bearing supporting the bearing and a bearing housing supporting the bearing, wherein the bearing, the bearing housing, and the bus bar holder are disposed to overlap in a radial direction of an axis of the shaft.

The embodiment includes a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, and a bus bar disposed on the stator, wherein the bus bar is a third third based on an axis of the shaft. It is possible to provide a motor including a first body having a first radius, a 3-2 body having a second radius different from the first radius, and a bending unit connecting the first body and the second body.

The embodiment includes a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, and a bus bar disposed on the stator, wherein the bus bar is in a circumferential direction with respect to the axis of the shaft. and a first bus bar, a second bus bar, and a third bus bar extending, wherein the first bus bar has a first radius with respect to the axis of the shaft, and the second bus bar has a second radius different from the first radius. The motor may have a second radius, and the third bus bar may have a third radius that is a distance between the first radius and the second radius.

According to the embodiment, by reducing the radial width of the busbar holder, there is an advantage of securing advantageous design conditions of the motor.

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

According to the embodiment, there is an advantage in that the torque of the motor can be secured while reducing the axial length of the motor.

1 is a side cross-sectional view of a motor according to an embodiment.
Figure 2 is an enlarged view of Figure 1, a cross-sectional view showing the positions of the bearing, the bearing housing and the bus bar holder;
3 is a view showing the bus bar and the bus bar holder shown in FIG. 1;
4 is a plan view of a bus bar;
5 is a view showing a third bus bar;
6 is a view showing a first bus bar and a third bus bar;
7 is a view showing a second bus bar and a third bus bar;
8 is a cross-sectional view of a bus bar and a bus bar holder taken along line AA of FIG. 3 .

The direction parallel to the longitudinal direction (up and 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 along a circle having a radial radius around the shaft is the circumference called the direction.

1 is a side cross-sectional view of a motor according to an embodiment.

1 , the motor according to the embodiment includes a shaft 100 , a rotor 200 , a stator 300 , a bus bar 400 , a bus bar holder 500 , a bearing 600 , and a bearing housing. 700 and a housing 800 may be included. Hereinafter, the term "inside" indicates a direction from the housing 800 toward the shaft 100 that is the center of the motor, and "outside" indicates a direction opposite to the inside, which is a direction from the shaft 100 toward the housing 800 .

The shaft 100 may be coupled to the rotor 200 . When 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 therewith. The shaft 100 may be formed of a hollow member.

The rotor 200 rotates through electrical interaction with the stator 300 . The rotor 200 may be disposed to correspond to the stator 300 and may be disposed inside. The rotor 200 may include a magnet.

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 insulator 320 is seated on the stator core 310 . The coil 330 is mounted on the insulator 320 . The coil 330 causes an electrical interaction with the magnet of the rotor 200 .

The bus bar 400 may be disposed on the stator 300 . The bus bar 400 is electrically connected to the coil 330 . And the bus bar 400 may be connected to an external power source.

The bus bar holder 500 supports the bus bar 400 . The bus bar holder 500 may be an annular member including the bus bar 400 therein.

The bearing 600 rotatably supports the shaft 100 .

The bearing housing 700 includes a bearing 600 . The bearing housing 700 covers an open side of the housing 800 .

The housing 800 may be disposed outside the stator 300 . The housing 800 may be a cylindrical member with one side open.

FIG. 2 is an enlarged view of X of FIG. 1 , and is a cross-sectional view showing positions of the bearing 600 , the bearing housing 700 , and the bus bar holder 500 .

Referring to FIG. 2 , the bearing 600 , the bearing housing 800 , and the bus bar holder 500 are disposed to overlap in the radial direction of the axis of the shaft 100 . Thus, it can be arranged axially to the bearing housing 700 , in considerable proximity to the stator 300 . While the bearing 600 is also located inside the bus bar 400 together with the bearing housing 700 in the radial direction, the axial length of the motor can be reduced without reducing the sizes of the stator 300 and the rotor 200 .

The configurations of the bearing 600 , the bearing housing 700 , and the bus bar holder 500 for implementing these features are as follows.

The bearing housing 700 may include an inner portion 710 , an outer portion 720 , and a folded portion 730 . The inner portion 710 is disposed to overlap the bearing 600 in the axial direction. The outer portion 720 is disposed on the outer side of the bearing 600 in a radial direction so that the outer end is in contact with the housing 800 . The folded part 730 connects the inner part 710 and the outer part 720 . The folded portion 730 may be formed by bending the bearing housing 700 to partially fold it.

The folded portion 730 supports the bearing 600 while the inner surface is in contact with the outer ring of the bearing 600 .

The folded portion 730 is disposed to overlap the bearing 600 and the bus bar holder 500 in the radial direction of the axis of the shaft 100 . In addition, the folded portion 730 may be disposed to overlap a portion of the bus bar 400 in the radial direction of the axis of the shaft 100 . Specifically, the folded portion 730 may be disposed between the bearing 600 and the bus bar holder 500 in the radial direction of the axis of the shaft 100 . This is due to the configuration in which the bearing 600 and the folded portion 730 are disposed inside the bus bar holder 500 .

As the bearing 600 is located inside the bus bar holder 500 , the bearing housing 700 is also disposed close to the rotor 200 and the stator 300 in the axial direction, so that the rotor 200 or the stator It is possible to reduce the axial length of the motor without reducing the axial length of 300 . As a result, the shortest distance L1 between the upper end of the folded portion 730 and the insulator 320 is smaller than the shortest distance L2 between the upper end of the bus bar holder 500 and the insulator 320 .

In order to arrange the bearing 600 and the folded part 730 inside the bus bar holder 500 , the radial width of the bus bar holder 500 needs to be reduced. And the shape and arrangement of the bus bar 400 corresponding thereto should be implemented.

3 is a view showing the bus bar 400 and the bus bar holder 500 shown in FIG. 1 , FIG. 4 is a plan view of the bus bar 400, and FIG. 5 is a third bus bar 400C. it is one drawing

3 to 5 , the bus bar 400 is a U-phase, V-phase, and W-phase three bus bars 400 , and a first bus bar extending in the circumferential direction with respect to the axis of the shaft 100 ( 400A), a second bus bar 400B, and a third bus bar 400C may be included.

The first bus bar 400A has a first radius R10 with respect to the axis of the shaft 100 .

The second bus bar 400B has a second radius R20 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.

The third bus bar 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 .

The third bus bar 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 a 3-1 th radius 31 . The second body 410B has a third radius R30 based on the axis of the shaft 100 and a 3-2 radius 32 different from the 3-1 radius 31 . For example, the 3-1 th radius 31 may be greater than the 3-2 th radius 32 .

FIG. 6 is a view showing a first bus bar 400A and a third bus bar 400C, and FIG. 7 is a view showing a second bus bar 400B and a third bus bar 400C.

5 to 7 , the bus bar 400 may include a body 410 and a plurality of terminals 420 extending from the body 410 . The body 410 may have a round shape formed along the circumferential direction. Some terminals 420A may extend radially from the body 410 to be connected to the coil 330 of the stator 300 . In addition, the other terminal 420B may extend in the axial direction from the body 410 to be connected to an external power source. All terminals 420A of the bus bar 400 connected to the coil 330 may be disposed at the same position in the radial direction.

4 and 6 , the first body 410A of the third bus bar 400C may be disposed on the same circular track as the body 410 of the first bus bar 400A. That is, the third radius R30 is the first radius R1 of the first bus bar 410A in the first area S1 of the third bus bar 410C, that is, in the area where the first body 410A is located. may be the same as On the other hand, the second body 410B of the third bus bar 400C may be disposed inside the body 410 of the first bus bar 400A.

Accordingly, in the area of the first bus bar 400A overlapping the third bus bar 400C in the radial direction, the terminals 420 of the third bus bar 400C are connected to the body 410 of the first bus bar 400A. ) may be extended to pass over. Accordingly, when viewed in the axial direction, there is a region where the terminal 420 of the third bus bar 400C and the body 410 of the first bus bar 400A overlap.

4 and 7 , the second body 410B of the third bus bar 400C may be disposed on the same circular orbit as the body 410 of the second bus bar 400B. That is, the third radius R30 is the second radius R2 of the second bus bar 410B in the second area S2 of the third bus bar 410C, that is, in the area where the second body 410B is located. may be the same as

On the other hand, the first body 410A of the third bus bar 400C may be disposed outside the body 410 of the second bus bar 400B. Accordingly, in the area of the first bus bar 400A overlapping the second bus bar 400B in the radial direction, the terminals 420 of the second bus bar 400B are connected to the first body of the third bus bar 400C. It may be arranged to extend beyond 410A. Accordingly, when viewed from the axial direction, there is a region where the first body 410A of the third bus bar 400C and the terminal 420 of the third bus bar 400C overlap.

8 is a cross-sectional view of the bus bar 400 and the bus bar holder 500 taken along line A-A of FIG. 3 .

The first bus bar 400A, the second bus bar 400B, and the third bus bar 400C are for reducing the radial width W1 of the bus bar holder 500, for example, , although there are three bus bars 400 , the number of bus bars 400 overlapping in the radial direction is reduced to two.

Referring to FIG. 8 , based on the radial direction, the bus bar 400 and the bus bar 400 should also be spaced apart from each other by a certain distance. Therefore, as the number of bus bars 400 overlapping in the radial direction increases, the radial width W1 of the bus bar holder 500 increases. If the number of the bus bars 400 overlapping in the radial direction is reduced, the radial width W1 of the bus bar holder 500 can be reduced without reducing the radial widths W2 and W3 of the bus bars 400 . .

Although all three bus bars 400 are provided, the number of bus bars 400 overlapping in the radial direction can be reduced to two due to the structural characteristics and arrangement of the third bus bar 400C. Therefore, the bus bar holder 500 can significantly reduce the radial width W1, thereby securing the inner space of the bus bar holder 500, and the bearing 600 and the inner side of the bus bar holder 500. A part of the bearing housing 700 may be disposed.

The cross-sections of the second bus bar 400B and the third bus bar 400C shown in FIG. 8 are each a body 410 part f, and the axial lengths H2 and H3 of the body 410 are the radial widths ( It is formed longer than W2 and W3). The side, the bus bar 400 may be arranged so that the body 410 is erected. And the axial length H1 of the bus bar holder 500 is disposed to be greater than the radial width W1.

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

100: shaft
200: rotor
300: stator
400: bus bar
400A: first bus bar
400B: second bus bar
400C: third bus bar
410: body
420: terminal
410A: first body
410B: second body
410C: bending part
500: busbar holder
600: bearing
700: bearing housing
800: housing

Claims (10)

shaft;
a rotor coupled to the shaft; and
It includes a stator disposed to correspond to the rotor,
a bus bar disposed on the stator and a bus bar holder supporting the bus bar;
a bearing supporting the shaft and a bearing housing supporting the bearing,
The bearing, the bearing housing, and the bus bar holder are disposed to overlap in a radial direction of an axis of the shaft. shaft;
a rotor coupled to the shaft; and
It includes a stator disposed to correspond to the rotor,
a bus bar disposed on the stator;
The bus bar includes a first body having a 3-1 radius with respect to the axis of the shaft, a 3-2 body having a second radius different from the first radius, and connecting the first body and the second body. A motor including a bending part. shaft;
a rotor coupled to the shaft; and
It includes a stator disposed to correspond to the rotor,
a bus bar disposed on the stator;
The bus bar includes a first bus bar, a second bus bar and a third bus bar extending in a circumferential direction with respect to the axis of the shaft,
With respect to the axis of the shaft, the first bus bar has a first radius and the second bus bar has a second radius different from the first radius;
The third bus bar has a third radius, which is a distance between the first radius and the second radius. According to claim 1,
a portion of the bearing housing is disposed between the bearing and the busbar holder in a radial direction of an axis of the shaft. According to claim 1,
A portion of the bearing housing is disposed to overlap the bus bar in a radial direction of an axis of the shaft. According to claim 1,
The stator includes a stator core, an insulator coupled to the stator core, and a coil disposed on the insulator,
The shortest distance between the bearing housing and the insulator is smaller than the shortest distance between the upper end of the bus bar holder and the insulator. 3. The method of claim 2,
The bus bar includes a first bus bar, a second bus bar and a third bus bar extending in a circumferential direction with respect to the axis of the shaft,
The first bus bar includes the first body, the second body, and the bending part,
The second bus bar is disposed inside the first body, and the third bus bar is disposed outside the second body. 4. The method of claim 3,
The third radius of the motor is the same as the first radius in the first area of the third bus bar and the same as the second radius in the second area of the third bus bar. 4. The method according to any one of claims 1 to 3,
The bus bar includes a body and a terminal extending from the body,
A motor in which the bodies of the plurality of bus bars overlap each other in a radial direction of an axis of the shaft. 4. The method according to any one of claims 1 to 3,
The bus bar holder has a radial width smaller than an axial length with respect to an axis of the shaft.

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