KR20210131050A - Motor - Google Patents

Abstract

According to an embodiment of the present invention, provided is a motor comprising: a stator; a rotor disposed on the stator; and a sensing unit disposed between the stator and the rotor. The rotor includes a first housing and a plurality of protrusions protruding from the first housing. The sensing unit includes a first substrate and a first sensing member disposed on an upper surface of the first substrate. The plurality of protrusions and the first sensing member are overlapped in a vertical direction.

Description

motor {Motor}

The embodiment relates to a motor.

The motor may include a rotor, a stator, and a shaft. The shaft is coupled to the rotor. The rotor may be disposed outside the stator. Due to the electromagnetic interaction between the rotor and the stator, the rotor rotates, and when the rotor rotates, the shaft rotates.

The shaft may be connected to a sensor device (eg, LiDAR: Light Detection and Ranging).

In order to detect the position of the rotor, the motor may include a code wheel connected to the rotor, and may further include a light source for irradiating light to the code wheel and an optical sensor for detecting the light. But. Such a motor has a large limitation in resolution, a complex configuration, and a large installation space limitation, a complicated manufacturing process, and a vulnerability to external force.

Accordingly, a motor of a method of detecting the position of a rotor using a multipolar magnetized sensing magnet and a rotary encoder sensor has been proposed. However, these motors have a problem in that the sensing magnet is vulnerable to external magnetism and assembly is poor.

Accordingly, the embodiment is intended to solve the above problems, and it is a problem to provide a motor having a simple configuration, good assembly, and high resolution in detecting the rotor position.

The problem to be solved by the present invention is 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.

The embodiment includes a stator, a rotor disposed on the stator, and a sensing unit disposed between the stator and the rotor, wherein the rotor comprises a first housing and a plurality of protrusions protruding from the first housing, The sensing unit may include a first substrate and a first sensing member disposed on an upper surface of the first substrate, and the plurality of protrusions and the first sensing member may vertically overlap each other.

Preferably, the first sensing member may include a coil, the plurality of protrusions may be arranged to form a circle, and the coil may be arranged to have a shape corresponding to the circle.

Preferably, the first substrate may include a first area having a circular band shape in which the first sensing member is disposed and a second area in which a second sensing member protruding inward from the first area is disposed. can

Preferably, the stator includes a second housing and a stator core, a protrusion of the rotor protrudes from a lower surface of the first housing, and the first substrate is disposed between the stator core and a bottom surface of the second housing. can be placed.

Preferably, the second housing includes an outer wall and an inner wall, and the stator core may be coupled to the inner wall.

Preferably, the inner wall may include a step formed outside, and the stator core may be disposed at the step.

Preferably, the first substrate may be disposed between the inner wall and the outer wall.

Preferably, the rotor may include a magnet disposed on the inner surface of the first housing to correspond to the stator core.

Preferably, the rotor may include a yoke disposed between the magnet and the inner surface of the first housing.

Preferably, it may include a shaft coupled to the first housing and the second housing, and the first housing and the second housing may include first and second holes coupled to the shaft.

Preferably, it may include a first bearing disposed between the shaft and the first housing and a second bearing disposed between the shaft and the second housing.

In an embodiment, a second substrate, a stator disposed on the second substrate, a rotor disposed on the stator, a first substrate disposed between the stator and the rotor, and disposed on the first substrate a coil and a connecting member electrically connecting the first substrate and the second substrate, wherein the rotor includes a plurality of protrusions, the coil is disposed to correspond to the plurality of protrusions, and the substrate includes the coil It is possible to provide a motor including an opening formed therein.

Preferably, the rotor may include a yoke disposed between the inner surfaces of the first housing, and the plurality of protrusions may be formed to extend radially from a lower end of the yoke.

Preferably, the coil may have a circular shape.

The embodiment includes a stator including a second housing, a rotor disposed on the stator and including a first housing, and a sensing unit disposed between the first housing and the second housing, wherein the rotor includes the second housing. 1 includes a plurality of protrusions protruding from the housing, the sensing unit includes a first substrate and a first sensing member disposed on the first substrate, and the first sensing member and the plurality of protrusions are disposed to correspond to each other motor can be provided.

Preferably, it includes a cover disposed under the first housing and a driving unit disposed on the cover, wherein the driving unit includes a second substrate and a driving element disposed on the second substrate, the first substrate and The second substrate may be electrically connected to each other.

According to the embodiment, by utilizing a part of the rotor as a component for detecting the position of the rotor, there is an advantage of simplifying the configuration and easy assembly.

According to the embodiment, since the protrusion for detecting the position of the rotor is disposed on the rotor, an error with respect to the position between the sensing unit and the protrusion is greatly reduced, so that the position of the rotor can be more accurately detected.

According to the embodiment, by arranging the first substrate and the second substrate in different spaces to secure the size of the first substrate on which the coil is disposed as large as possible, there is an advantage of increasing the resolution in detecting the rotor position.

1 is a perspective view showing a motor according to an embodiment;
2 is an exploded perspective view of the motor shown in FIG. 1;
3 is a side cross-sectional view of the motor shown in FIG. 1;
4 is a front view of the first housing;
5 is a plan view of the first housing;
6 is a perspective view illustrating a first substrate and a second substrate;
7 is a plan view showing the first substrate;
8 is a plan view showing a driving unit;
9 is a view showing the first substrate and the second substrate viewed in the axial direction;
10 shows a first substrate and a second substrate manufactured from the same substrate material;
11 is a view showing the position of the outer wall of the second housing and the projection of the rotor;
12 is a view showing a rotor including a projection according to a modification;
13 is a side cross-sectional view of the motor including the rotor shown in FIG. 12 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected among the embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as “at least one (or more than one) of A and (and) B, C”, it is combined with A, B, and C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on “above (above) or under (below)” of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as “upper (upper) or lower (lower)”, the meaning of not only an upward direction but also a downward direction based on one component may be included.

1 is a perspective view showing a motor according to an embodiment, FIG. 2 is an exploded perspective view of the motor shown in FIG. 1 , and FIG. 3 is a side cross-sectional view of the motor shown in FIG. 1 . Hereinafter, the inner side is the direction toward the shaft 100 based on the radial direction of the motor, and the outer side is the opposite direction of the inner side.

1 to 3 , the motor according to the embodiment includes a shaft 100 , a rotor 200 , a stator 300 , a sensing unit 400 , a second substrate 500 , and a connection member ( 600 , a driving unit 700 , a bearing 800 , and a cover 900 .

The shaft 100 is coupled to the second housing 310 . The shaft 100 may be press-fitted into the center of the second housing 310 .

The rotor 200 rotates about the shaft 100 as an axis. The rotor 200 may include a first housing 210 , a protrusion 220 , and a yoke 240 . A first bearing 810 is fixed to the center of the first housing 210 . The protrusion 220 may be disposed on the lower surface 211 of the first housing 210 . The yoke 240 is a metal member and may be disposed on the inner surface of the side wall of the first housing 210 . The yoke 240 is disposed between the inner surface of the first housing 210 and the magnet 230 . The magnet 230 may be fixed to the inside of the yoke 240 . The magnet 230 may be a single ring magnet 230 or a combination of a plurality of unit magnets 230 . Meanwhile, a first hole 212 through which the shaft 100 passes may be disposed in the center of the first housing 210 .

The stator 300 may include a second housing 310 , a stator core 320 , and an insulator 330 .

The second bearing 800 may be disposed in the center of the second housing 310 . The second bearing 800 supports the shaft 100 . In addition, the second housing 310 may include an inner wall 312 and an outer wall 313 . In the radial direction, the inner wall 312 is disposed closer to the center of the second housing 310 than the outer wall 313 . The inner wall 312 and the outer wall 313 are portions protruding from the bottom surface 311 of the second housing 310 in the axial direction of the shaft 100 . Both the inner wall 312 and the outer wall 313 may be an annular member including an inner circumferential surface and an outer circumferential surface. The inner wall 312 may be disposed to be radially spaced apart from the second bearing 800 .

The stator core 320 is coupled to the inner wall 312 of the second housing 310 . For example, the stator core 320 may be coupled to the second housing 310 so that the inner circumferential surface of the stator core 320 contacts the outer circumferential surface of the inner wall 312 . In addition, the inner wall 312 of the second housing 310 may include a step 312a, and the stator core 320 may be disposed at the step 312a. Meanwhile, a second hole 314 through which the shaft 100 passes may be disposed in the center of the second housing 310 .

The sensing unit 400 detects the position of the rotor 200 . The sensing unit 400 may include a first substrate 410 and a first sensing member 420 .

The first substrate 410 may be positioned above the second housing 310 . And, it is disposed on the bottom surface 311 of the second housing 310 . The first substrate 410 may be disposed between the inner wall 312 and the outer wall 313 of the second housing 310 .

The first substrate 410 may be disposed below the protrusion 220 of the second housing 310 . In the axial direction of the shaft 100 , the protrusions 220 of the first substrate 410 and the second housing 310 are disposed to face each other. The first substrate 410 is an annular member and may include an opening 401 .

The first sensing member 420 may be disposed on the first substrate 410 . The first sensing member 420 may be a coil. The first sensing member 420 interacts with the protrusion 220 of the second housing 310 to generate an induced electromotive force. The first sensing member 420 may have a shape in which a predetermined pattern is repeated. The overall shape of the first sensing member 420 may be circular.

The driving unit 500 may be located below the second housing 310 . The driving unit 500 may include a second substrate 500 and a driving element 520 disposed on the second substrate 500 .

The connecting member 600 electrically connects the first substrate 410 and the second substrate 500 . The connection member 600 may be a connector or a connection pin disposed through the second housing 310 .

The bearing 800 may include a first bearing 810 and a second bearing 820 . The first bearing 810 is fixed to the first housing 210 to support the shaft 100 . The second bearing 820 is fixed to the second housing 310 to support the shaft 100 .

The cover 900 is coupled to the second housing 310 to cover the space of the second housing 310 in which the second substrate 500 is disposed.

4 is a front view of the first housing 210 , and FIG. 5 is a plan view of the first housing 210 .

4 and 5 , the first housing 210 may include a plurality of protrusions 220 . The protrusion 220 may protrude from the lower surface 211 of the first housing 210 . When the first housing 210 rotates, the protrusion 220 interacts with the first sensing member 420 disposed on the first substrate 410 to generate an induced electromotive force. The plurality of protrusions 220 may be arranged at regular intervals along the circumferential direction with respect to the center of the first housing 210 . Some of the side surfaces of the protrusion 220 may be curved. In addition, the other part of the side surface of the protrusion 220 may be disposed such that the extended surface passes through the center C1 of the first housing 210 .

Since the protrusion 220 is formed to protrude as a part of the first housing 210 , there is no need for a separate configuration for detecting the position of the rotor 200 , so that the configuration is simple.

A first hole 212 through which the shaft 100 passes may be disposed in the center of the first housing 210 .

6 is a perspective view illustrating the first substrate 410 and the second substrate 500 , and FIG. 7 is a plan view illustrating the first substrate 410 .

6 and 7 , the first substrate 410 is an annular member including an inner circumferential surface. The first substrate 410 is for detecting the position of the rotor 200 . The first substrate 410 may be divided into a first region 411 and a second region 412 . The first region 411 is a region in which the first sensing member 420 is disposed, and may have a circular band shape. The second region 412 is a region in which the second sensing member 416 is disposed, and protrudes inward from the inner circumferential surface of the first region 411 .

The second sensing member 416 is also for detecting the position of the rotor 200 , and may be a Hall IC that detects a change in magnetic force sensed by the magnet 230 . In addition, the second region 412 may include an inductive encoder 413 connected to the first sensing member 420 to sense the induced electromotive force. In addition, a first pinhole 414 to which the connecting member 600 is connected may be disposed in the second region 412 . In addition, a plurality of coupling portions 415 for coupling with the second housing 310 may be disposed on the second substrate 500 . The coupling part 415 may be disposed to protrude from the inner circumferential surface of the first region 411 .

In the first sensing member 420 , a coil having a predetermined pattern is disposed along the first region 411 , and is disposed to face the protrusion 220 . Accordingly, the protrusion 220 is disposed along a rotational path with respect to the axial center.

8 is a plan view illustrating the driving unit 500 .

Referring to FIG. 8 , the driving unit 500 includes a second substrate 510 and a driving device 520 . The second substrate 510 is a circular member. The driving element 520 is disposed on the second substrate 510 to control driving of the motor. A second pinhole 512 to which the connecting member 600 is connected may be disposed on the second substrate 510 . A groove 511 may be disposed in the second substrate 510 . The groove 511 is formed to be inwardly concave at the edge of the second substrate 510 . The shape of the groove 511 corresponds to the shape of the second region 412 of the first substrate 410 .

9 is a view showing the first substrate 410 and the second substrate 510 viewed in the axial direction.

3 and 9 , when viewed in the axial direction, the first substrate 410 is disposed outside the second substrate 510 . The first substrate 410 has a larger size in the radial direction than the second substrate 510 . Accordingly, the radius of the first sensing member 420 disposed on the first substrate 410 increases, and as the radius of the first sensing member 420 increases or decreases, the resolution for detecting the position of the rotor 200 increases, so that the rotor ( 200) can be detected more precisely.

The installation space of the first substrate 410 and the second substrate 510 is divided in the axial direction. The first substrate 410 is disposed above the second housing 310 , and the second substrate 510 is disposed below the second housing 310 . In addition, the second substrate 510 is disposed in a sealed space in which the second housing 310 and the cover 900 are coupled to each other to prevent water and dust. Since the driving device 520 of the motor is disposed on the second substrate 510 , it is advantageous for stability to be disposed in a separate space from the first substrate 410 . That is, the first substrate 410, which requires a large radius in order to increase the resolution, is disposed on the upper side of the second housing 310 to secure an installation space, and the second substrate 510 requires waterproof and dustproof regardless of the resolution. is placed on the lower side of the second housing 310 to ensure stability,

A portion of the second region 412 of the first substrate 410 may be disposed to overlap the second substrate 510 in the axial direction. This is to electrically connect the first substrate 410 and the second substrate 510 , and to align the connection positions of the connection members 600 with respect to the first substrate 410 and the second substrate 510 . . For example, a portion of the second region 412 of the first substrate 410 is formed such that the first pinhole 414 of the first substrate 410 and the second pinhole 512 of the second substrate 510 are aligned. It may be disposed to overlap the second substrate 510 in the axial direction.

10 is a diagram illustrating a first substrate 410 and a second substrate 510 manufactured from the same substrate material.

Referring to FIG. 10 , the first substrate 410 and the second substrate 510 are manufactured from the same substrate material. Therefore, when the first substrate 410 and the second substrate 510 are disposed to have the coaxial C2, the second substrate 510 is disposed inside the first substrate 410, and the first substrate 410 is The second region 412 of the second substrate 510 corresponds to the groove 511 of the second substrate 510 . In addition, a gap G is formed between the first substrate 410 and the second substrate 510 . The first substrate 410 and the second substrate 510 have an advantage of maximally utilizing a rectangular substrate material.

11 is a view showing the positions of the outer wall 313 of the second housing 310 and the protrusions 220 of the rotor 200 .

7 and 11 , the protrusion 220 is disposed to form an overlap region O1 in the vertical direction (axial direction) with the first sensing member 420 of the first substrate 410 . Meanwhile, in the radial direction, the outer wall 313 of the second housing 310 may be disposed to form an overlapping area with the protrusion 220 of the rotor 200 . The outer wall 313 of the second housing 310 has an effect of preventing foreign substances from entering the inside of the rotor 200 .

12 is a view illustrating a rotor 200 including a projection 220 according to a modified example. 13 is a side cross-sectional view of the motor including the rotor 200 shown in FIG. 12 .

Referring to FIG. 12 , the protrusion 220 may be disposed on the yoke 240 . For example, the protrusion 220 may be disposed to extend radially outwardly from the lower end of the yoke 240 . The plurality of protrusions 220 may be radially disposed with respect to the center of the yoke 240 . The plurality of protrusions 220 may be disposed at regular intervals along the circumferential direction of the yoke 240 . That is, a portion of the yoke 240 is used as the protrusion 220 , and the protrusion 220 is disposed on the lower surface of the first housing 210 to face the first substrate 410 in the axial direction. The protrusion 220 interacts with the first sensing member 420 to generate an induced electromotive force.

As described above, the motor according to a preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention. ?

100: shaft
200: rotor
210: first housing
220: turn
230: magnet
240: York
300: stator
310: second housing
320: stator core
400: sensing unit
410: first substrate
411: first area
412: second area
420: first sensing member
421: coil
500: drive unit
510: second substrate
520: driving element
600: connection member
700: driving unit
800: bearing
900: cover

Claims (16)

stator;
a rotor disposed on the stator; and
A sensing unit disposed between the stator and the rotor,
The rotor includes a first housing and a plurality of protrusions protruding from the first housing,
The sensing unit includes a first substrate and a first sensing member disposed on an upper surface of the first substrate,
The plurality of protrusions and the first sensing member are vertically overlapped with each other. According to claim 1,
The first sensing member includes a coil,
The plurality of projections are arranged to form a circle,
The coil is arranged to have a shape corresponding to the circular motor. According to claim 1,
The first substrate includes a first region having a circular band shape in which the first sensing member is disposed and a second region in which a second sensing member protruding inward from the first region is disposed. According to claim 1,
The stator includes a second housing and a stator core,
The protrusion of the rotor protrudes from the lower surface of the first housing,
The first substrate is disposed between the stator core and a bottom surface of the second housing. 5. The method of claim 4,
The second housing includes an outer wall and an inner wall,
The stator core is coupled to the inner wall of the motor. 6. The method of claim 5,
The inner wall includes a step formed outward,
The stator core is disposed in the step motor. 7. The method of claim 6,
The first substrate is disposed between the inner wall and the outer wall. 5. The method of claim 4,
The rotor includes a magnet disposed on an inner surface of the first housing to correspond to the stator core. 9. The method of claim 8,
The rotor includes a yoke disposed between the magnet and the inner surface of the first housing. 5. The method of claim 4,
a shaft coupled to the first housing and the second housing;
The first housing and the second housing include first and second holes coupled to the shaft. 11. The method of claim 10,
A motor comprising: a first bearing disposed between the shaft and the first housing; and a second bearing disposed between the shaft and the second housing. a second substrate;
a stator disposed on the second substrate;
a rotor disposed on the stator;
a first substrate disposed between the stator and the rotor;
a coil disposed on the first substrate; and
a connection member electrically connecting the first substrate and the second substrate;
The rotor includes a plurality of projections,
The coil is disposed to correspond to the plurality of projections,
wherein the substrate includes an opening formed inside the coil. 13. The method of claim 12,
The rotor includes a yoke disposed between the inner surfaces of the first housing,
The plurality of protrusions are formed to extend radially from the lower end of the yoke. 13. The method of claim 12,
The coil is a motor forming a circular shape. a stator including a second housing;
a rotor disposed on the stator and including a first housing; and
a sensing unit disposed between the first housing and the second housing;
The rotor includes a plurality of protrusions protruding from the first housing,
The sensing unit includes a first substrate and a first sensing member disposed on the first substrate,
The first sensing member and the plurality of protrusions are disposed to correspond to each other. 16. The method of claim 15,
A cover disposed under the first housing and a driving unit disposed on the cover,
The driving unit includes a second substrate and a driving element disposed on the second substrate,
The first substrate and the second substrate are electrically connected to each other.

Images