KR20210094825A - Motor - Google Patents

Abstract

The present invention is to provide a motor capable of reducing the overall size and weight of the motor while sufficiently securing the axial length of a mirror. According to an embodiment, the motor includes: a shaft; a rotor coupled to the shaft; a stator disposed between the shaft and the rotor; a connection member including a first surface and a second surface, and disposed on the rotor; a holder disposed on the connection member; and a mirror coupled to the holder. The rotor includes a yoke coupled to the shaft, the first surface is in contact with the holder, and the second surface is in contact with the yoke.

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).

The sensor device may be a device that detects the returned pulse when the emitted light pulse strikes an object and is reflected back. In this case, in order to emit the light pulse, the sensor device may include a mirror. The mirror is connected to the rotor through the holder. When the rotor rotates, the holder rotates, and the mirror fixed to the holder rotates.

The mirror must have a sufficient height in the axial direction. This is to sufficiently secure the field of view of the sensor device.

However, when the axial length of the mirror is increased, the mountability of the motor is deteriorated, and the energy efficiency of the equipment on which the motor is mounted is deteriorated due to an increase in the weight and size of the motor.

Accordingly, the embodiment is intended to solve the above problems, and while sufficiently securing the axial length of the mirror, it is a task to provide a motor capable of reducing the overall size and weight of the motor.

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 shaft, a rotor coupled to the shaft, a stator disposed between the shaft and the rotor, and a connecting member disposed on the rotor including a first surface and a second surface, and the connecting member a holder disposed thereon and a mirror coupled to the holder, wherein the rotor includes a yoke coupled to the shaft, the first surface being in contact with the holder, and the second surface being in contact with the yoke A motor can be provided.

Preferably, the connecting member may be disposed to overlap the mirror in a radial direction.

Preferably, the mirror and the yoke may be arranged to overlap in a radial direction.

Preferably, the mirror includes a first mirror and a second mirror, and the holder includes a first member coupled with the first mirror, a second member coupled with the second mirror, the first member and the A third member connecting the second member may be included, wherein the first surface may be in contact with the third member, and the second surface may be in contact with an upper surface of the yoke.

Preferably, the yoke is disposed on the upper surface of the yoke and includes a first hole through which the shaft passes, the connection member is press-fitted into the first hole to be coupled to the yoke, and the holder and the holder through a fastening member. can be combined

Preferably, the yoke may include a second hole disposed on an upper surface of the yoke, and a portion of the fastening member in a radial direction may be disposed to overlap the second hole.

Preferably, the connecting member may include a third hole through which the fastening member passes, and a screw tab may be disposed on an inner surface of the third hole.

Preferably, the connection member may include a body including the first surface and the second surface, and a protrusion protruding from the second surface and disposed inside the first hole.

Preferably, the first member includes a third surface in contact with the first mirror, and a first groove concavely disposed on the third surface, and the second member includes a third surface in contact with the second mirror. It includes four surfaces and a second groove concavely disposed on the fourth surface, and an adhesive may be positioned in the first groove and the second groove.

Preferably, each of the first groove and the second groove may have an axial length greater than a width direction.

Preferably, the third member may include a fourth hole through which the shaft passes, and a fifth hole through which the fastening member passes.

Preferably, the second hole, the third hole, and the fifth hole may be disposed to correspond to each other in an axial direction.

Preferably, the first member includes a fifth surface disposed opposite the first surface, and a third groove disposed concavely from the fifth surface, and the second member is disposed opposite the second surface a sixth surface that is formed and a fourth groove concavely disposed on the sixth surface, a portion of the yoke may be disposed in the third groove, and another portion of the yoke may be disposed in the fourth groove. .

According to the embodiment, there is an advantage of reducing the weight and size of the motor while sufficiently securing the axial length of the mirror.

According to the embodiment, in connecting the holder and the rotor, there is an advantage of reducing the number of parts and the assembling process by using a single connecting member.

According to the embodiment, grooves in which the adhesive is located are arranged long in the axial direction on the surface of the holder in contact with the mirror, so that it is easy to apply the adhesive and to easily cure the adhesive.

According to the embodiment, since a portion of the fastening member of the holder and the connecting member is disposed to radially overlap the upper surface of the yoke of the rotor, there is an advantage in preventing slippage between the holder and the rotor in the rotational direction.

According to the embodiment, since the protrusion of the connecting member is press-fitted into the yoke, there is an advantage of easy assembly.

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 taken along line AA of FIG. 1;
4 is a perspective view showing a connecting member;
5 is a bottom view of the connecting member shown in FIG. 4;
Figure 6 is a side view of the connecting member shown in Figure 4;
7 is an enlarged side view of FIG. 3A;
8 is a view showing a yoke;
9 is a view showing a holder;
Fig. 10 is a cross-sectional view of the holder taken along line AA of Fig. 9;
11 is a cross-sectional view of the holder taken along line BB of FIG. 9 .

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 taken along line A-A of 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 may include a shaft 100 , a rotor 200 , and a stator 300 .

The shaft 100 is coupled to the yoke 210 of the rotor 200 . The shaft 100 may be press-fitted and coupled to the yoke 210 . Alternatively, the shaft 100 may be integral with the yoke 210 . This shaft 100 rotates together with the rotor 200 . The shaft 100 is rotatably supported by a bearing 700 disposed inside the bearing housing 500 .

The rotor 200 may include a yoke 210 , a driving magnet 220 , and a sensing magnet 230 .

The yoke 210 is coupled to the shaft 100 . The shaft 100 may be located at the center of the yoke 210 .

The driving magnet 220 is for rotation of the yoke 210 . The driving magnet 220 may be disposed on the inner surface of the yoke 210 . The driving magnet 220 may be disposed to face the stator 300 in the radial direction of the rotor 200 . When electrical interaction occurs between the driving magnet 220 and the coil of the stator 300 , the yoke 210 rotates. The driving magnet 220 may be a combination of a plurality of unit magnets. Alternatively, the driving magnet 220 may be a single unit having a ring shape.

The sensing magnet 230 is for precisely recognizing the position of the rotor 200 . The sensing magnet 230 may be disposed on the inner surface of the yoke 210 . In addition, the sensing magnet 230 may be disposed to face the substrate 400 in the axial direction.

The stator 300 may be disposed between the shaft 100 and the yoke 210 . The stator 300 may be fixed to the outer surface of the bearing housing 500 . The stator 300 includes a stator 300 core including a plurality of teeth, and a coil may be wound around each tooth. The teeth may include an insulator that insulates the coil and the stator 300 core.

The substrate 400 is disposed on one side of the yoke 210 . The substrate 400 may include a sensor 410 . The sensor 410 may be a Hall IC or an encoder IC that detects a change in magnetic flux of the sensing magnet 230 . The sensor 410 may be disposed to face the driving magnet 220 or the sensing magnet 230 in the axial direction.

The bearing housing 500 is a member for accommodating the bearing 700 therein. Bearing housing 500 may include a cylindrical member-like region elongated along the axial direction.

A bearing housing 500 is fixed to the plate 600 . Although the plate 600 and the bearing housing 500 are illustrated as separate parts, the plate 600 and the bearing housing 500 may be integrally formed. The substrate 400 may be seated on one surface of the plate 600 .

The bearing 700 may be mounted on the inner side of one end of the bearing housing 500 and the inner side of the other end of the bearing housing 500 in the axial direction, respectively. The bearing 700 rotatably supports the shaft 100 . In the radial direction of the motor, the bearing 700 may be disposed so as not to overlap the stator 300 . For example, one of the two bearings 700 may be disposed higher than the stator 300 in the axial direction, and the other may be disposed lower than the stator 300 . And, any one of the two bearings 700 may be disposed higher than the driving magnet 220 in the axial direction.

The connecting member 800 is a member for coupling the yoke 210 and the holder 900 . The connecting member 800 is disposed between the yoke 210 and the holder 900 in the axial direction to couple the yoke 210 and the holder 900 . When the yoke 210 rotates, the connecting member 800 rotates and the holder 900 also rotates. The connecting member 800 may be a cylindrical member. In the axial direction, one surface of the connecting member 800 may be in contact with the yoke 210 , and the other surface of the connecting member 800 may be in contact with the holder 900 .

The holder 900 fixes the mirrors 1000 and 1100 . And the holder 900 is coupled to the connecting member 800, and rotates together with the yoke (210). The holder 900 may be a member made of a frame so that the cross-section is empty inside. The holder 900 having this shape is strong in bending and has the advantage of greatly reducing the weight. The first mirror 1000 and the second mirror 1100 may be disposed to face each other on one surface and the other surface of the holder 900 . The holder 900 may be “l” to overlap the first mirror 1000 and the second mirror 1100 in a radial direction, respectively.

The mirrors 1000 and 1100 serve to reflect the laser irradiated to the sensing object. The mirrors 1000 and 1100 may include a first mirror 1000 disposed on one surface of the holder 900 and a second mirror 1100 disposed on the other surface of the holder 900 . When the yoke 210 rotates, the holder 900 rotates, and as the holder 900 rotates, the mirrors 1000 and 1100 also rotate. The mirrors 1000 and 1100 may be plate-shaped members having a long length in the axial direction. The mirrors 1000 and 1100 and the holder 900 may be coupled through an adhesive.

4 is a perspective view showing the connecting member 800, FIG. 5 is a bottom view of the connecting member 800 shown in FIG. 4, and FIG. 6 is a side view of the connecting member 800 shown in FIG.

4 to 6 , the connecting member 800 includes a first surface 801 and a second surface 802 . The first surface 801 may correspond to one surface of the cylindrical connecting member 800 , and the second surface 802 may correspond to the other surface of the cylindrical connecting member 800 . The first surface 801 and the second surface 802 are disposed to face each other. The first surface 801 and the second surface 802 may be disposed on a plane perpendicular to the axial direction, respectively.

The connecting member 800 may include a third hole 820 and a sixth hole 810 . The sixth hole 810 is a hole through which the shaft 100 passes. The inner diameter of the sixth hole 810 is larger than the outer diameter of the shaft 100 . The sixth hole 810 is disposed at the center of the connecting member 800 . The third hole 820 is where the fastening member 10 is fastened. The third hole 820 is disposed through the first surface 801 and the second surface 802 . A screw tab may be formed on an inner surface of the third hole 820 . A plurality of third holes 820 may be disposed. The plurality of third holes 820 may be disposed at equal intervals along the circumferential direction of the connecting member 800 .

The connecting member 800 may include a protrusion 830 . The protrusion 830 protrudes from the second face 802 . The protrusion 830 may be an annular member. The protrusion 830 is a portion press-fitted into the first hole 213a of the yoke 210 . A portion of the protrusion 830 may be disposed to overlap the third hole 820 . This is in consideration of the positions of the first hole 213a and the second hole 213b of the yoke 210 .

7 is an enlarged side view of FIG. 3A .

Referring to FIG. 7 , the first surface 801 of the connecting member 800 is in contact with the lower surface of the third member 930 of the holder 900 . The second surface 802 of the connecting member 800 is in contact with the upper surface of the yoke 210 . The connecting member 800 is disposed between the third member 930 of the holder 900 and the yoke 210 in the axial direction.

The fastening member 10 passes through the third member 930 of the holder 900 and is fastened to the third hole 820 of the connecting member 800 . As the fastening member 10 is rotationally fastened to the third hole 820 , the holder 900 and the connecting member 800 are coupled.

The protrusion 830 of the connecting member 800 may be press-fitted into the first hole 213a of the yoke 210 . As the protrusion 830 is press-fitted into the first hole 213a, the connecting member 800 and the yoke 210 are coupled. As a result, the holder 900 and the yoke 210 are coupled via the connecting member 800 . Since the holder 900 is coupled to the yoke 210 through the single connection member 800 , there is an advantage of easy assembly.

The fastening member 10 is disposed to pass through the third member 930 and the connecting member 800 of the holder 900 . And the end of the fastening member 10 may be disposed through the second hole (213b) of the yoke (210). In this case, the end of the fastening member 10 may be disposed so that a portion of the fastening member 10 overlaps the second hole 213b in the radial direction. Therefore, in the rotational direction, by the end of the fastening member 10, the connecting member 800 and the rotor 200 are constrained to each other to prevent slippage between the connecting member 800 and the rotor 200. can

8 is a diagram illustrating the yoke 210 .

Referring to FIG. 8 , the yoke 210 may include a base 211 , a magnet accommodating part 212 , and a pillar part 213 . The yoke 210 may be a cylindrical member having one side and the other open as a whole. The magnet accommodating part 212 may protrude from the base 211 . The pillar part 213 may protrude from the magnet accommodating part 212 . The base 211, the magnet accommodating part 212, and the pillar part 213 may have different inner diameters, respectively. The inner diameter of the base 211 may be greater than the inner diameter of the magnet accommodating part 212 . The inner diameter of the magnet accommodating part 212 may be larger than the inner diameter of the pillar part 213 .

A sensing magnet 230 is disposed inside the base 211 . A driving magnet 220 is disposed inside the magnet accommodating part 212 . A portion of the bearing housing 500 may be disposed inside the pillar part 213 . One end surface of the column part 213 in the axial direction is in contact with one end surface of the connecting member 800 . A first hole 213a passing through the shaft 100 may be disposed on one surface of the pillar part 213 . The protrusion 830 of the connecting member 800 is press-fitted into the first hole 213a.

The pillar part 213 may be disposed to overlap the holder 900 in the radial direction. The pillar part 213 may be disposed to radially overlap the first mirror 1000 and the second mirror 1100 . Such a shape of the yoke 210 is in consideration of the characteristics of the shaft 100 , the first mirror 1000 , and the second mirror 1100 which are arranged to be long in the axial direction.

The yoke 210 may include a second hole 213b. The end of the fastening member 10 is positioned in the second hole 213b. Since the end of the fastening member 10 is disposed through the second hole 213b, the yoke 210 and the connecting member 800 are constrained to each other in the rotational direction. A plurality of second holes 213b may be disposed. The number of the second holes 213b may correspond to the number of the fastening members 10 . The second hole 213b may be radially concave from the edge of the first hole 213a.

9 is a view showing the holder 900 .

Referring to FIG. 9 , the holder 900 may include a first member 910 , a second member 920 , a third member 930 , and a sidewall 950 . The first member 910 is coupled to the first mirror 1000 . The second member 920 is coupled to the second mirror 1100 . The third member 930 connects the first member 910 and the second member 920 . The sidewall 950 may be disposed between the first member 910 and the second member 920 . The first member 910 may include a third surface 901 in contact with the first mirror 1000 . The second member 920 may include a fourth surface 902 in contact with the second mirror 1100 . The third surface 901 and the fourth surface 902 may be disposed to face each other. In addition, the third surface 901 and the fourth surface 902 may be disposed to be elongated in the axial direction.

Due to the empty space inside the holder 900 , the first surface 801 may be divided into a horizontal area 900A and a vertical area 900B contacting a partial area of the first mirror 1000 . The second surface 802 may also be divided into a horizontal area 900A and a vertical area 900B contacting a partial area of the second mirror 1100 .

The holder 900 may include a first groove 940A and a second groove 940B to which an adhesive is applied. The first groove 940A is concave in the third surface 901 . The first groove 940A may have an axial length k1 greater than a width direction length w1. The first groove 940A may be disposed in the vertical region 900B of the first surface 801 . The second groove 940B is concave in the fourth surface 902 . The second groove 940B may have an axial length k1 greater than a width direction length w1. The second groove 940B may be disposed in the vertical region 900B of the second surface 802 .

The first mirror 1000 and the second mirror 1100 have a relatively long axial length in consideration of the scan range. Therefore, when the first groove 940A and the second groove 940B to which the adhesive is applied are arranged to be long in the axial direction, the advantage of increasing the bonding force between the first mirror 1000 and the second mirror 1100 and the holder 900 . There is an advantage in that it is easy to apply the adhesive to the holder 900 and the curing operation of the adhesive is easy.

The holder 900 may be manufactured by die-casting using aluminum, which can relatively reduce weight.

FIG. 10 is a cross-sectional view of the holder 900 taken along line A-A of FIG. 9 .

Referring to FIG. 10 , the third member 930 of the holder 900 is disposed in a direction perpendicular to the axial direction to connect the first member 910 and the second member 920 . The third member 930 may include a fourth hole 960 and a fifth hole 970 . The fourth hole 960 is a place through which the shaft 100 passes, and the inner diameter of the fourth hole 960 is set to be larger than the outer diameter of the shaft 100 . The shaft 100 may pass through the fourth hole 960 so that an end of the shaft 100 may protrude above the upper surface of the third member 930 .

The fifth hole 970 is a place through which the fastening member 10 passes, and the inner diameter of the fifth hole 970 is set to be larger than the outer diameter of the shaft 100 . In a state in which the fastening member 10 passes through the fifth hole 970 and is fastened to the connecting member 800 , the head of the fastening member 10 may contact the upper surface of the third member 930 . The second hole 213b, the third hole 820, and the fifth hole 970 may be disposed to correspond to each other in the axial direction. The end of the fastening member 10 passing through the fifth hole 970 and the third hole 820 is located in the second hole 213b.

11 is a cross-sectional view of the holder 900 taken along line B-B of FIG. 9 .

Referring to FIG. 11 , the first member 910 may include a fifth surface 903 disposed to face the third surface 901 . A third groove 903a may be disposed on the fifth surface 903 . The third groove 903a may be concavely formed on the fifth surface 903 toward the third surface 901 and may have a curved surface. The second member 920 may include a sixth surface 904 disposed opposite the fourth surface 902 . A fourth groove 904a may be disposed on the sixth surface 904 . The fourth groove 904a may be concavely formed on the sixth surface 904 toward the second surface 802 and may have a curved surface.

A portion of the yoke 210 may be disposed in the third groove 903a. In addition, another portion of the yoke 210 may be disposed in the fourth groove 904a. Due to the third groove 903a and the fourth groove 904a, there is an advantage in that the size of the holder 900 can be reduced while securing the size of the yoke 210 .

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: York
211: base
212: magnet receiving unit
213: pillar
220: driving magnet
230: sensing magnet
300: stator
400: substrate
500: bearing housing
600: plate
700: bearing
800: connecting member
801: first side
802: second side
900: holder
910: first member
920: second member
930: third member
1000: first mirror
1100: second mirror

Claims (13)

shaft;
a rotor coupled to the shaft;
a stator disposed between the shaft and the rotor;
a connection member including a first surface and a second surface, the connection member being disposed on the rotor;
a holder disposed on the connecting member; and
and a mirror coupled to the holder;
The rotor includes a yoke coupled to the shaft,
The first surface is in contact with the holder and the second surface is in contact with the yoke. The motor of claim 1 , wherein the connecting member is disposed to overlap the mirror in a radial direction. According to claim 1,
The mirror and the yoke are disposed to overlap in a radial direction. According to claim 1,
The mirror includes a first mirror and a second mirror,
The holder includes a first member coupled to the first mirror, a second member coupled to the second mirror, and a third member coupling the first member and the second member,
The first surface is in contact with the third member, and the second surface is in contact with an upper surface of the yoke. According to claim 1,
The yoke is disposed on the upper surface of the yoke and includes a first hole through which the shaft passes,
The connecting member is press-fitted into the first hole, coupled to the yoke, and coupled to the holder through a fastening member. 6. The method of claim 5,
The yoke includes a second hole disposed on the upper surface of the yoke,
A part of the fastening member in the radial direction is disposed to overlap the second hole. 6. The method of claim 5,
The connecting member includes a third hole through which the fastening member passes,
A motor having a screw tab disposed on an inner surface of the third hole. 6. The method of claim 5,
The connecting member includes a body including the first surface and the second surface, and a protrusion protruding from the second surface and disposed inside the first hole. 5. The method of claim 4,
The first member includes a third surface in contact with the first mirror, and a first groove concavely disposed on the third surface,
The second member includes a fourth surface in contact with the second mirror, and a second groove concavely disposed on the fourth surface,
An adhesive is positioned in the first groove and the second groove. 10. The method of claim 9,
Each of the first groove and the second groove has an axial length greater than a width direction length of the motor. 7. The method of claim 6,
The third member includes a fourth hole through which the shaft passes, and a fifth hole through which the fastening member passes. 12. The method of claim 11,
The second hole, the third hole, and the fifth hole are disposed to correspond to each other in an axial direction. 6. The method of claim 5,
The first member includes a fifth surface disposed opposite to the first surface, and a third groove concavely disposed on the fifth surface,
The second member includes a sixth surface disposed opposite to the second surface, and a fourth groove concavely disposed on the sixth surface,
A portion of the yoke is disposed in the third groove,
Another part of the yoke is disposed in the fourth groove.

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