electric machine

Abstract

Embodiments can provide an electric motor including a shaft, a rotor engaged with the shaft, a stator disposed between the shaft and the rotor, a bearing disposed between the shaft and the stator, and a base plate, wherein the rotor includes a yoke engaged with the shaft, the base plate includes a body, a first partition wall protruding from the body, and a second partition wall extending from the first partition wall, the first partition wall is disposed between the bearing and the stator, a portion of the second partition wall is disposed to overlap the first partition wall, and the first partition wall is in contact with a side surface of an outer ring of the bearing, and the second partition wall is in contact with one surface of the outer ring of the bearing.

Description

TECHNICAL FIELD

[0001] Embodiments relate to an electric motor. BACKGROUND

[0002] The electric motor can include a rotor, a stator, and a shaft. The shaft is coupled to the rotor. The rotor can be disposed outside the stator. The rotor rotates by electromagnetic interaction between the rotor and the stator, and the shaft rotates as the rotor rotates.

[0003] The shaft can connect a sensor device (e.g., light detection and ranging (LiDAR)).

[0004] To detect a position of the rotor, the electric motor can include a sensor configured to sense a magnetic flux change of a driving magnet disposed in the rotor. Also, to improve resolution, a separate sensing magnet of a multi-pole magnetization can be disposed, and a sensor configured to sense a magnetic flux change therefrom can be disposed.

[0005] The sensors can be mounted on a substrate. The substrate can be mounted to a base plate. Meanwhile, a bearing configured to support the shaft can be disposed, and the bearing can be accommodated in a bearing housing. The bearing housing can be coupled to the base plate.

[0006] When the bearing housing is coupled with the base plate, a press-fit or caulking is used. Generally, the bearing housing is made of aluminum or brass, and the base plate is made of a steel plate.

[0007] The bearing housing needs to ensure rigidity to support the shaft through the bearing. Therefore, the bearing housing must be designed to have a thickness greater than or equal to a certain thickness. However, as the thickness of the bearing housing increases, there is a problem in that the design of other components is limited. In addition, since the materials of the bearing housing and the base plate are different from each other, the press-fit portion or the caulking portion is constantly stressed due to temperature and external force, causing a problem of structural weakness.

[0008] Meanwhile, the sensor device can be a device that senses a pulse returned when an emitted light pulse is reflected due to hitting an object. In this case, to emit the light pulse, the sensor device can include a mirror. The mirror is connected to the rotor by a holder. When the rotor rotates, the holder rotates, and the mirror fixed to the holder also rotates.

[0009] The mirror needs to have a sufficient height in an axial direction, thereby sufficiently securing a field of view of the sensor device.

[0010] However, a longer length of the mirror in the axial direction causes a decline in mountability of the electric motor, and an increase in weight and size of the electric motor causes a deterioration in energy efficiency of a device in which the electric motor is mounted.

[0011] On the other hand, constant speed driving of the motor can be an important factor in securing the sensor device apparatus. The constant speed driving of the motor can be determined by detecting the position of the rotating rotor. In order to detect the position of the rotor, the motor can include a Hall sensor configured to sense a change in magnetic flux of a driving magnet provided on the rotor. However, when very high constant speed conditions of the motor are required in order to use the sensor apparatus, there is a problem that it is limited to meet the constant speed conditions of the motor with a change in magnetic flux sensed by the ordinary driving magnet.

[0012] Accordingly, a separate multi-pole magnetized sensing magnet needs to be additionally provided to improve resolution.

[0013] Even if the sensing magnet is additionally provided, there is a problem that the additional sensing magnet needs to be provided with a separate sensor to detect an indication signal that identifies one rotation of the motor.

[0014] Meanwhile, since the stator is provided below the mirror in the axial direction, there is a problem that the height of the mirror cannot be sufficiently secured due to the height of the stator.

[0015] Meanwhile, the mirror is fixed to the holder by an adhesive. The bonding force of the mirror fixed with the adhesive is weak, and can be separated from the holder due to external force or vibration. In particular, when the performance of the adhesive is degraded due to temperature and humidity conditions, there is a risk that the mirror can be separated from the holder. In addition, when the holder and the mirror are fixed by a separate guide, the guide can cover the coating layer provided on the front surface of the mirror in the process of joining the guide to the mirror, resulting in a decrease in sensing performance. SUMMARY

[0016] TECHNICAL PROBLEM

[0017] Hereinafter, the present embodiment aims to solve the above problems and provide a motor having high structural rigidity and high design freedom.

[0018] The present embodiment also provides a motor that can reduce the size and weight of the entire motor while sufficiently securing the axial length of the mirror.

[0019] The present embodiment also provides a motor that can accurately identify the position of the rotor without an additional sensing magnet in a simple configuration.

[0020] The present embodiment also provides a motor that secures sensing performance while firmly fixing the mirror to the holder.

[0021] The problems to be solved by the present application are not limited to the above-mentioned problems, and other problems not mentioned herein will be clearly understood by those skilled in the art through the following description.

[0022] Technical solutions

[0023] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft, a stator disposed between the shaft and the rotor, a bearing disposed between the shaft and the stator, and a base plate, wherein the rotor includes a yoke engaged with the shaft, the base plate includes a body, a first partition wall protruding from the body, and a second partition wall extending from the first partition wall, the first partition wall is disposed between the bearing and the stator, a portion of the second partition wall is disposed to overlap the first partition wall, and the first partition wall is in contact with a side surface of an outer ring of the bearing, and the second partition wall is in contact with one surface of the outer ring of the bearing.

[0024] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft, a stator disposed between the shaft and the rotor, a bearing disposed between the shaft and the stator, and a base plate, wherein the rotor includes a yoke engaged with the shaft, the yoke includes a first hole through which the shaft passes, the base plate includes a second hole through which the shaft passes, an inner diameter of the second hole is larger than an inner diameter of the first hole, the shaft is in contact with an inner surface of the first hole, and an outer surface of the bearing is in contact with an inner surface of the second hole.

[0025] Preferably, the yoke can include an extension in contact with the shaft, and the second partition wall can be disposed to overlap the extension in a radial direction.

[0026] Preferably, at least a portion of the first partition wall can be disposed to overlap the stator in a radial direction.

[0027] Preferably, a curved surface can be provided at a boundary between the body and the first partition wall.

[0028] Preferably, a distance of the body to an upper end of the first partition wall can be greater than a length of the bearing, and can be less than a longest distance of the body to the yoke in an axial direction.

[0029] Preferably, the rotor can further include a driving magnet and a sensing magnet engaged with the yoke, and at least a portion of the first partition wall in a radial direction can be disposed to overlap the stator, the driving magnet, and the sensing magnet.

[0030] Preferably, a portion of the base plate can be disposed to overlap the bearing in a radial direction.

[0031] Preferably, a portion of the base plate can be disposed to overlap the yoke in a radial direction.

[0032] Preferably, a radial direction distance in the radial direction between the inner surface of the inner ring of the bearing and the outer surface of the outer ring can be the same as a difference between the inner diameter of the second hole and the inner diameter of the first hole.

[0033] Embodiments provide an electric motor including a shaft, a rotor coupled to the shaft, a stator disposed between the shaft and the rotor, a coupling member including a first surface and a second surface and disposed on the rotor, a holder disposed on the coupling member, and a mirror coupled to the holder, wherein 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.

[0034] Preferably, the coupling member can be disposed to overlap the mirror in the radial direction.

[0035] Preferably, the mirror and the yoke can be disposed to overlap in the radial direction.

[0036] Preferably, the mirror can include a first mirror and a second mirror, and the holder can include a first member coupled to the first mirror, a second member coupled to the second mirror, and a third member connecting the first member and the second member, wherein the first surface can be in contact with the third member, and the second surface can be in contact with an upper surface of the yoke.

[0037] Preferably, the yoke can include a first hole through which the shaft passes, disposed on an upper surface of the yoke, the coupling member can be press-fitted into the first hole and coupled to the yoke, and the coupling member can be coupled to the holder by a fastening member.

[0038] Preferably, the yoke can include a second hole disposed on the upper surface of the yoke, and a portion of the fastening member can be disposed to overlap the second hole in the radial direction.

[0039] Preferably, the coupling member can include a third hole through which the fastening member passes, and a screw tab can be disposed on an inner surface of the third hole.

[0040] Preferably, the coupling member can include a body including the first surface, the second surface, and a protrusion protruding from the second surface and disposed within the first hole.

[0041] Preferably, the first member can include a third surface in contact with the first mirror and a first groove recessed on the third surface, the second member can include a fourth surface in contact with the second mirror and a second groove recessed on the fourth surface, and an adhesive can be disposed in the first groove and the second groove.

[0042] Preferably, an axial length of each of the first groove and the second groove can be greater than a length in a width direction.

[0043] Preferably, the third member can include a fourth hole through which the shaft passes and a fifth hole through which the fastening member passes.

[0044] Preferably, the second hole, the third hole, and the fifth hole can be disposed to correspond to each other in the axial direction.

[0045] Preferably, the first member can include a fifth surface facing the first surface and a third groove recessed on the fifth surface, the second member can include a sixth surface facing the second surface and a fourth groove recessed on the sixth surface, a portion of the yoke can be disposed in the third groove, and another portion of the yoke can be disposed in the fourth groove.

[0046] An embodiment can provide an electric motor including a shaft, a rotor coupled to the shaft, a stator disposed in the rotor, and a substrate on which a sensor is disposed, wherein the rotor includes a yoke including a body and a flange extending from the body, the flange including a plurality of first edges and a plurality of second edges, the plurality of first edges and the plurality of second edges being alternately disposed in a circumferential direction of the yoke, the second edges being disposed closer to the body than the first edges in a radial direction of the yoke.

[0047] Preferably, the substrate can include a coil electrically connected to the sensor, and the sensor can be disposed to correspond to the magnet.

[0048] Preferably, the coil can be a patterned coil.

[0049] Preferably, the stator can be disposed between the shaft and the rotor.

[0050] Preferably, the yoke can be coupled to the shaft.

[0051] Preferably, the magnet can be disposed on an inner circumferential surface of the body.

[0052] Preferably, the first edge can be disposed outside the coil.

[0053] Preferably, at least a portion of the coil can be disposed between the first edge and the second edge in the radial direction of the yoke.

[0054] Preferably, the first edge and the second edge can be curved, and the second edge can be disposed on an outer circumferential surface of the body.

[0055] Preferably, the flange can include a third edge connecting the first edge and the second edge, and the third edge can be disposed in the radial direction of the yoke.

[0056] Preferably, a thickness of the body can be the same as a thickness of the flange.

[0057] Preferably, the magnet and the flange can be disposed to overlap in a radial direction of the yoke.

[0058] Preferably, a base on which the substrate is disposed, a bearing housing connected to the base, and a bearing disposed inside the bearing housing can be further included, the stator can be engaged with an outer side of the bearing housing, and the shaft can be rotatably supported by the bearing.

[0059] Preferably, the flange can be disposed to overlap the bearing housing in a radial direction of the yoke.

[0060] Preferably, each of the plurality of first edges can have the same circumferential length, and the plurality of second edges can have the same circumferential length.

[0061] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft and including a yoke, a stator disposed in the rotor, a connection member disposed on the rotor, a holder engaged with the connection member, a mirror engaged with the holder, a bearing housing engaged with the stator, and first and second bearings disposed in the bearing housing, wherein the first bearing is disposed between the bearing housing and the yoke, the second bearing is disposed between the shaft and the bearing housing, and the stator is disposed to overlap the mirror in a radial direction.

[0062] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft, a stator disposed in the rotor, a connection member disposed on the rotor, a holder disposed on the connection member, a mirror engaged with the holder, a bearing housing engaged with the stator, and first and second bearings disposed in the bearing housing, wherein the first bearing is disposed to overlap the mirror in a radial direction, the second bearing is disposed not to overlap the mirror in the radial direction, and an inner diameter of the first bearing can be disposed to be greater than an inner diameter of the second bearing.

[0063] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft, a stator disposed in the rotor, a connection member disposed on the rotor, a holder disposed on the connection member, first and second mirrors engaged to the holder, a bearing housing engaged with the stator, and a first bearing disposed in the bearing housing, wherein the rotor includes a yoke engaged with the shaft and a magnet disposed in the yoke, the yoke includes a magnet accommodation portion in which the magnet is disposed and a column portion in contact with the first bearing. An outer diameter of the magnet accommodation portion can be greater than an outer diameter of the column portion and less than a shortest distance between the first and second mirrors.

[0064] Preferably, the first bearing can be disposed to overlap the mirror in a radial direction, and the second bearing can be disposed not to overlap the mirror in the radial direction.

[0065] Preferably, the magnet can be disposed to overlap the first and second mirrors.

[0066] Preferably, an inner diameter of the stator can be less than an outer diameter of the first bearing, and an inner diameter of the second bearing can be less than an inner diameter of the first bearing.

[0067] Preferably, the bearing housing can include a first region in contact with the stator and a second region in contact with the first bearing, and an outer diameter of the first region can be greater than an outer diameter of the second region.

[0068] Preferably, the bearing housing can include a third region in contact with the second bearing, and an inner diameter of the third region can be greater than an outer diameter of the first region.

[0069] Preferably, the stator can include a stator core, and an inner diameter of the stator can be less than an outer diameter of the first bearing.

[0070] Preferably, the connection member can include a first surface and a second surface, wherein the first surface can be in contact with the holder, and the second surface can be in contact with the yoke.

[0071] An embodiment can provide an electric motor including a shaft, a rotor engaged with the shaft and including a yoke, a stator disposed in the rotor, a connection member disposed on the rotor, a holder disposed on the connection member, and a mirror engaged with the holder, wherein the holder includes a first surface in contact with a rear surface of the mirror and a first protrusion disposed to protrude more than the first surface, and the first protrusion is in contact with one of a side surface and a front surface of the mirror.

[0072] Preferably, the holder can include a body having a first surface and a bracket engaged with the body, wherein the bracket can include a first protrusion, and the first protrusion can be in contact with two side surfaces of the mirror.

[0073] Preferably, the holder can include a second protrusion protruding more than the first surface, and the second protrusion can be in contact with an upper surface or a lower surface of the mirror.

[0074] Preferably, a height of the mirror can be greater than a height of the bracket and less than a height of the holder.

[0075] Preferably, the bracket can include a bracket body in contact with the holder and a clip portion bent from the bracket body to contact the side surfaces of the mirror.

[0076] Preferably, at least a portion of the side surfaces of the mirror can include a first side portion inclined with respect to a front surface of the mirror, and the clip portion can be in contact with the first side portion.

[0077] Preferably, the holder can include a body having a first surface and a bracket engaged with the body, wherein the bracket can include a first protrusion, and the first protrusion can be in contact with two side surfaces of the mirror.

[0078] Preferably, the bracket can include a bracket body in contact with the holder and a clip portion bent from the bracket body to contact the side surfaces of the mirror.

[0079] Preferably, the first protrusion can include a 1-1 protrusion in contact with one side surface of the mirror and a 1-2 protrusion in contact with the other side surface of the mirror, and the holder can include a body including a first surface and the first protrusion, the body can include a first portion and a second portion engaged with the first portion. A portion of the first surface can be disposed on the first portion, and a remaining portion of the first surface can be disposed in the second portion. The 1-1 protrusion can be disposed on the first portion, and the 1-2 protrusion can be disposed on the second portion.

[0080] Preferably, the first portion and the second portion can be symmetrically disposed about a center of a width of the mirror.

[0081] Preferably, the holder can include a first bolt and a second bolt engaged across the first portion and the second portion. A head of the first bolt can be in contact with the first portion, and a head of the second bolt can be in contact with the second portion.

[0082] Preferably, a thickness of the first protrusion can be the same as a thickness of the mirror.

[0083] Preferably, the first protrusion can include a 1-1 protrusion in contact with one of the side surfaces of the mirror and a 1-2 protrusion in contact with the other of the side surfaces of the mirror. The holder can include a body having a first surface and a protrusion, wherein the body can include a third portion, a fourth portion joined to the third portion, and a fifth portion joined to the fourth portion. The first surface can be disposed in the third portion, the first protrusion can be disposed on the fourth portion, and the second protrusion can be disposed on the fifth portion.

[0084] Preferably, the third portion and the fourth portion can be spaced apart from the rear surface of the mirror.

[0085] Preferably, the side surfaces of the mirror can include a third side surface connected to the front surface of the mirror and a fourth side surface connected to the rear surface of the mirror. The third side surface and the fourth side surface can be connected by a stepped surface, and the first protrusion can be in contact with the stepped surface.

[0086] Preferably, a portion of the mirror and a portion of the first protrusion can be disposed to overlap each other with respect to a thickness direction of the mirror.

[0087] Advantageous Effects

[0088] According to an embodiment, a portion of the base plate can support the bearing, thereby providing high structural rigidity and high design freedom.

[0089] According to an embodiment, the bearing housing can be removed to facilitate assembly and tolerance management.

[0090] According to an embodiment, a portion of the base plate can support the bearing, thereby providing high structural rigidity.

[0091] According to an embodiment, the weight and size of the motor can be reduced while sufficiently securing the axial length of the mirror.

[0092] According to an embodiment, when the holder and the rotor are connected, the number of components and assembly procedures can be reduced by using the connection member as a single component.

[0093] According to an embodiment, since a groove in which the adhesive is located on a surface of the holder in contact with the mirror is elongated in the axial direction, the adhesive can be easily applied and easily cured.

[0094] According to an embodiment, the holder and the connection member can be arranged such that a portion of the fastening member overlaps an upper surface of the yoke of the rotor in a radial direction, thereby preventing slippage in a rotational direction between the holder and the connection member.

[0095] According to an embodiment, the protrusion of the connection member can be press-fitted into the yoke, thereby facilitating assembly.

[0096] According to the embodiments, the number of components used to sense the rotor position can be greatly reduced, thereby simplifying the structure.

[0097] According to an embodiment, a yoke configured to fix the magnet can be used to sense the position of the rotor using magnetic induction, thereby reducing the number of parts.

[0098] According to the embodiments, this achieves the beneficial effect of satisfying the high constant speed drive conditions.

[0099] According to the embodiments, the position of the rotor can be detected by using a yoke flange, thereby providing high design freedom and high availability.

[0100] According to the embodiment, since no sensing magnet is used, its advantage is that there is no magnetic field interference with the driving magnet.

[0101] According to the embodiment, while reducing the outer diameter of the stator, the winding space of the stator for the coil can be ensured, thereby increasing the axial length of the reflector and ensuring the torque of the motor.

[0102] According to an embodiment, a relatively large first bearing can rotatably support the yoke, thereby providing high robustness to the shaft structure.

[0103] According to the embodiment, it has the advantage of firmly fixing the reflector to the retainer.

[0104] According to this embodiment, when the reflector is fixed to the retainer, the coating on the front surface of the reflector is not covered, thus ensuring sensing performance. Attached Figure Description

[0105] Figure 1 This is a perspective view showing an electric motor according to one embodiment;

[0106] Figure 2 yes Figure 1 An exploded perspective view of the motor shown;

[0107] Figure 3 It is along Figure 1 The side sectional view of the motor taken by line AA in the figure;

[0108] Figure 4 This is a perspective view showing the yoke;

[0109] Figure 5 This is a view showing the base plate;

[0110] Figure 6 yes Figure 5 The bottom view of the base plate shown;

[0111] Figure 7 It is shownFigure 3 A magnified view of part A in the image;

[0112] Figure 8 This is a side sectional view showing a portion of the motor;

[0113] Figure 9 This is a perspective view showing an electric motor according to one embodiment;

[0114] Figure 10 yes Figure 9 An exploded perspective view of the motor shown;

[0115] Figure 11 It is along Figure 9 A side sectional view of the motor taken by line AA;

[0116] Figure 12 This is a perspective view showing the connecting components;

[0117] Figure 13 yes Figure 12 The bottom view of the connecting component shown;

[0118] Figure 14 yes Figure 12 Side view of the connecting component shown;

[0119] Figure 15 yes Figure 11 An enlarged side view of part A in the image;

[0120] Figure 16 This is a view showing the yoke;

[0121] Figure 17 This is a view showing the retainer;

[0122] Figure 18 It is along Figure 17 The sectional view of the retainer is taken by line AA.

[0123] Figure 19 It is along Figure 17 A sectional view of the retainer taken by line BB;

[0124] Figure 20 This is a perspective view showing an electric motor according to one embodiment;

[0125] Figure 21 yes Figure 20 An exploded perspective view of the motor shown;

[0126] Figure 22 yes Figure 20 The side sectional view of the motor shown;

[0127] Figure 23 It is shown Figure 20View of the yoke of the electric machine shown;

[0128] Figure 24 is Figure 23 Plan view of the yoke shown;

[0129] Figure 25 is a view showing the substrate;

[0130] Figure 26 is a view of the coil and the flange as seen in axial direction;

[0131] Figure 27 is a perspective view showing the electric machine according to an embodiment;

[0132] Figure 28 is Figure 27 Exploded perspective view of the electric machine shown;

[0133] Figure 29 is a side sectional view of the electric machine taken along the line A3-A3 of Figure 27

[0134] Figure 30 is a perspective view showing the connecting member;

[0135] Figure 31 is Figure 30 Bottom view of the connecting member shown;

[0136] Figure 32 is Figure 30 Side view of the connecting member shown;

[0137] Figure 33 is Figure 29 Enlarged side view of the part A3 of

[0138] Figure 33 is a view showing the yoke;

[0139] Figure 34 is a perspective view of the bearing housing;

[0140] Figure 35 is a side sectional view of the bearing housing taken along the line B3-B3 of Figure 36

[0141] Figure 35 is an enlarged side view of the part B3 in Figure 37

[0142] is a view showing the retainer; Figure 29

[0143] is a sectional view of the retainer taken along the line C3-C3 of Figure 37 Figure 38

[0144] ​​​​Figure 39 It is along Figure 38 A cross-sectional view of the retainer taken by line D3-D3;

[0145] Figure 40 This is a perspective view showing an electric motor according to one embodiment;

[0146] Figure 38 yes Figure 41 An exploded perspective view of the motor shown;

[0147] Figure 42 It is along Figure 41 The side sectional view of the motor is taken by line AA.

[0148] Figure 43 This is a perspective view showing the reflector;

[0149] Figure 41 yes Figure 44 The top view of the reflector shown;

[0150] Figure 45 This is a perspective view showing the body of the retainer;

[0151] Figure 44 This is a perspective view showing the bracket of the retainer;

[0152] Figure 46 yes Figure 47 The top view of the support shown;

[0153] Figure 48 It is a top plan view of the retainer and the reflector;

[0154] Figure 47 This is a view showing the assembly process of the retainer and the mirror;

[0155] Figure 49 This is a view showing the body of the retainer according to a modified example;

[0156] Figure 50 This is a side view of the retainer based on another modified example;

[0157] Figure 51 It shows a reflector and a device placed within it. Figure 52 A side view of the holder of the body shown;

[0158] Figure 53 This is a view showing the retainer and mirror according to yet another modified example;

[0159] Figure 51 yes Figure 54 A perspective view of the bracket shown;

[0160] Figure 55 yesFigure 54 The top view of the support shown;

[0161] Figure 56 This is a top plan view showing the bracket that contacts the front surface of the mirror and secures the mirror to the retainer;

[0162] Figure 54 This is a view showing the retainer and mirror according to a further modified example;

[0163] Figure 57 yes Figure 58 An exploded view of the retainer and mirror shown;

[0164] Figure 59 yes Figure 58 The top view of the retainer and the reflector shown;

[0165] Figure 60 This is a view showing the retainer and mirror according to a further modified example;

[0166] Figure 58 yes Figure 61 An exploded view of the retainer and mirror shown;

[0167] Figure 62 yes Figure 61 The top view of the retainer and the reflector is shown. Detailed Implementation

[0168] The direction parallel to the longitudinal direction (vertical direction) of the axis is called the axial direction, while the direction perpendicular to the axial direction around the axis is called the radial direction, and the direction around the axis along a circle with a radial radius is called the circumferential direction.

[0169] Figure 63 This is a perspective view showing an electric motor according to one embodiment. Figure 61 yes Figure 1 The exploded perspective view of the motor shown. Figure 2 It is along Figure 1 The image shows a side sectional view of the motor taken by line AA. In the following text, the inner side is the direction of the motor's radial x-axis towards axis 100, and the outer side is the direction opposite to the inner side. In the accompanying drawings, the x-axis represents the radial direction, and the z-axis represents the axial direction.

[0170] refer to Figure 3 The motor according to the embodiment may include a shaft 100, a rotor 200 and a stator 300.

[0171] Shaft 100 engages with yoke 210 of rotor 200. Shaft 100 can be press-fitted and engaged with yoke 210. Alternatively, shaft 100 can be integral with yoke 210. Shaft 100 rotates together with rotor 200. Shaft 100 is rotatably supported by bearing 600.

[0172] The rotor 200 can include a yoke 210, a driving magnet 220, and a sensing magnet 230.

[0173] The yoke 210 is coupled with the shaft 100. The shaft 100 can be disposed at the center of the yoke 210.

[0174] The driving magnet 220 serves to rotate the yoke 210. The driving magnet 220 can be disposed on the inner surface of the yoke 210. The driving magnet 220 can be disposed to face the stator 300 in the radial direction x of the rotor 200. When an electrical interaction occurs between the driving magnet 220 and the coil of the stator 300, the yoke 210 is rotated. The driving magnet 220 can be a combination of a plurality of unit magnets. Alternatively, the driving magnet 220 can be a single member having a ring shape.

[0175] The sensing magnet 230 serves to accurately identify the position of the rotor 200. The sensing magnet 230 can be disposed on the inner surface of the yoke 210. In addition, the sensing magnet 230 can be disposed to face the substrate 400 in the axial direction z.

[0176] The stator 300 can be disposed between the shaft 100 and the yoke 210. The stator 300 can be fixed to the outer surface of the first partition wall 520 of the base substrate 500. Figure 1 The stator 300 can include a core of the stator 300 having a plurality of teeth, and a coil can be wound around each tooth. The teeth can include an insulator configured to insulate the coil and the core of the stator 300.

[0177] The substrate 400 is disposed on one side of the yoke 210. The substrate 400 can include a sensor 410. The sensor 410 can be a Hall IC or an encoder IC that senses a change in the magnetic flux of the sensing magnet 230. The sensor 410 can be disposed to face the driving magnet 220 or the sensing magnet 230 in the axial direction z.

[0178] The substrate 400 can be mounted on one surface of the base substrate 500.

[0179] The bearing 600 rotatably supports the shaft 100.

[0180] Figures 1 to 3 is a perspective view illustrating the yoke 210.

[0181] Referring to Figure 7 and Figure 4 , the yoke 210 can include a base 211 and a magnet accommodation portion 212. The yoke 210 can be a cylindrical member that is open overall on one side and the other side. The magnet accommodation portion 212 can protrude from the base 211. The base 211 and the magnet accommodation portion 212 can respectively have different inner diameters. The inner diameter of the base 211 can be greater than the inner diameter of the magnet accommodation portion 212.

[0182] The sensing magnet 230 is disposed inside the base 211. The driving magnet 220 is disposed inside the magnet accommodation portion 212.

[0183] The yoke 210 can include a first hole H1. The shaft 100 is disposed to pass through the first hole H1.

[0184] Figure 3 is a view showing the base plate 500, Figure 4 is Figure 5 is a bottom view of the base plate 500.

[0185] Referring to Figure 6 and Figure 5 , the base plate 500 can include a body 510 and a first partition wall 520. The base plate 400 is mounted on one surface of the body 510. The first partition wall 520 protrudes from the body 510. The first partition wall 520 is an annular member that forms a space inside thereof. The body 510 and the first partition wall 520 are integrated with each other. The bearing 600 is accommodated in the inside of the first partition wall 520.

[0186] The first partition wall 520 forms a second hole H2. The second hole H2 is a portion through which the shaft 100 passes.

[0187] Figure 5 is an enlarged view showing a portion A in Figure 6 .

[0188] Referring to Figure 7 , an inner diameter D2 of the second hole H2 is greater than an inner diameter D1 of the first hole H1. An inner ring 620 of the bearing 600 is in contact with the shaft 100, and an outer surface of an outer ring 610 of the bearing 600 is in contact with an inner surface of the second hole H2.

[0189] The base plate 500 can include a second partition wall 530. The second partition wall 530 extends from the first partition wall 520. The second partition wall 530 can be disposed to be bent from the first partition wall 520. In addition, the second partition wall 530 can be disposed to overlap the first partition wall 520 in a radial direction x. In the radial direction x, the first partition wall 520 can be disposed between the bearing 600 and the stator 300. An inner surface of the first partition wall 520 is in contact with a side surface 611 of the outer ring 610 of the bearing 600. An outer surface of the first partition wall 520 is in contact with the stator 300. The stator 300 can be fixed to the first partition wall 520. The second partition wall 530 can be in contact with one surface 612 of the outer ring 610 of the bearing 600. For example, an end portion of the second partition wall 530 can be in contact with the one surface 612 of the outer ring 610 of the bearing 600. Accordingly, the bearing 600 is bound in the radial direction x by the first partition wall 520 and in an axial direction z by the second partition wall 530.

[0190] Figure 3 is a side cross-sectional view showing a portion of the motor.

[0191] Referring to Figures 5 to 7 , the yoke 210 can include an extension 213 in contact with the shaft 100. The second partition wall 530 can be disposed to overlap the extension 213 in the radial direction x. Also, at least a portion of the first partition wall 520 can be disposed to overlap the stator 300 in the radial direction x. Also, at least a portion of the first partition wall 520 can be disposed to overlap the driving magnet 220 and the sensing magnet 230 in the radial direction x.

[0192] The distance L1 from the body 510 to the upper end of the first partition wall 520 is greater than the length L3 of the bearing 600. Also, the distance L1 from the body 510 to the upper end of the first partition wall 520 is less than the axially longest distance L2 of the yoke 210 from the body 510 of the base plate 500.

[0193] On the other hand, the radial distance T1 between the inner surface of the inner ring 620 of the bearing 600 and the outer surface of the outer ring 610 of the bearing 600 can be the same as the difference between the inner diameter D2 of the second hole H2 and the inner diameter D1 of the first hole H1.

[0194] This structure is implemented by allowing a portion of the base plate 500 to protrude toward the yoke 210 to accommodate the bearing 600. Since the total length of the motor is small in the axial direction z, the motor can be easily installed, and high tolerance management and high structural stability in the axial direction z can be achieved. In particular, since the portion accommodating the bearing 600 is a portion of the base plate 500 made of iron, there is an advantage of achieving an axial structure having high structural rigidity.

[0195] The first partition wall 520 can be processed by drawing the base plate 500, which is a flat plate member. Accordingly, the boundary between the first partition wall 520 and the body 510 can be curved.

[0196] Figure 8 is a perspective view showing a motor according to one embodiment, Figure 8 is Figure 9 is an exploded perspective view of the motor shown in Figure 10 is a side cross-sectional view of the motor taken along line A-A of Figure 9 In the following, the inner side is a direction facing the shaft 100 based on the radial direction of the motor, and the outer side is a direction opposite to the inner side.

[0197] Referring to Figure 11 , the motor according to an embodiment can include a shaft 1100, a rotor 1200, and a stator 1300.

[0198] The shaft 1100 is engaged to the yoke 1210 of the rotor 1200. The shaft 1100 can be press-fitted and engaged to the yoke 1210. Alternatively, the shaft 1100 can be integrated with the yoke 1210. The shaft 1100 rotates together with the rotor 1200. The shaft 1100 is rotatably supported by the bearing 1700 disposed inside the bearing housing 1500.

[0199] The rotor 1200 can include the yoke 1210, the driving magnet 1220, and the sensing magnet 1230.

[0200] The yoke 1210 is engaged with the shaft 1100. The shaft 1100 can be disposed at the center of the yoke 1210.

[0201] The driving magnet 1220 serves to rotate the yoke 1210. The driving magnet 1220 can be disposed on the inner surface of the yoke 1210. The driving magnet 1220 can be disposed to face the stator 1300 in the radial direction of the rotor 1200. When an electrical interaction occurs between the driving magnet 1220 and the coil of the stator 1300, the yoke 1210 rotates. The driving magnet 1220 can be a combination of a plurality of unit magnets. Alternatively, the driving magnet 1220 can be a single part having a ring shape.

[0202] The sensing magnet 1230 serves to accurately identify the position of the rotor 1200. The sensing magnet 1230 can be disposed on the inner surface of the yoke 1210. In addition, the sensing magnet 1230 can be disposed to face the substrate 1400 in the axial direction.

[0203] The stator 1300 can be disposed between the shaft 1100 and the yoke 1210. The stator 1300 can be fixed to the outer surface of the bearing housing 1500. The stator 1300 can include a core of the stator 1300 having a plurality of teeth, and a coil can be wound around each tooth. The teeth can include an insulator configured to insulate the coil and the core of the stator 1300.

[0204] The substrate 1400 is disposed on one side of the yoke 1210. The substrate 1400 can include a sensor 1410. The sensor 1410 can be a Hall IC or an encoder IC that senses a change in the magnetic flux of the sensing magnet 1230. The sensor 1410 can be disposed to face the driving magnet 1220 or the sensing magnet 1230 in the axial direction.

[0205] The bearing housing 1500 is a member that accommodates the bearing 1700 inside thereof. The bearing housing 1500 can include an area such as a cylindrical member elongated in the axial direction.

[0206] The bearing housing 1500 is fixed to the plate 1600. Although the plate 1600 and the bearing housing 1500 are separately shown, the plate 1600 and the bearing housing 1500 can be integrated with each other. The base plate 1400 can be seated on one surface of the plate 1600.

[0207] The bearings 1700 can be respectively installed at the inner side of one side end of the bearing housing 1500 and the inner side of the other side end of the bearing housing 1500 in the axial direction. The bearings 1700 rotatably support the shaft 1100. The bearings 1700 can be disposed not to overlap the stator 1300 in the radial direction of the motor. For example, one of the two bearings 1700 can be disposed higher than the stator 1300 and the other of the two bearings 1700 can be disposed lower than the stator 1300 based on the axial direction. Also, one of the two bearings 1700 can be disposed higher than the driving magnet 1220 based on the axial direction.

[0208] The connecting member 1800 is a member that joins the yoke 1210 to the holder 1900. The connecting member 1800 is disposed between the yoke 1210 and the holder 1900 in the axial direction, and the connecting member 1800 joins the yoke 1210 to the holder 1900. When the yoke 1210 rotates, the connecting member 1800 rotates, and the holder 1900 rotates together. The connecting member 1800 can be a cylindrical member. One surface of the connecting member 1800 can be in contact with the yoke 1210 in the axial direction, and the other surface of the connecting member 1800 can be in contact with the holder 1900.

[0209] The holder 1900 fixes the mirrors 11000 and 11100. Also, the holder 1900 is joined to the connecting member 1800 and rotates together with the yoke 1210. The holder 1900 can be a member formed of a frame such that the inside of its cross section is empty. The holder 1900 having such a shape is resistant to bending and has the advantage of greatly reducing weight. The first mirror 11000 and the second mirror 11100 can be disposed to face each other on one surface and the other surface of the holder 1900. The holder 1900 can be disposed to overlap each of the first mirror 11000 and the second mirror 11100 in the radial direction.

[0210] The mirrors 11000 and 11100 are used to reflect laser light that is irradiated to an object to be sensed. The mirrors 11000 and 11100 can include a first mirror 11000 provided on one surface of the holder 1900 and a second mirror 11100 provided on the other surface of the holder 1900. When the yoke 1210 is rotated, the holder 1900 is rotated, and as the holder 1900 is rotated, the mirrors 11000 and 11100 are rotated together. The mirrors 11000 and 11100 can be rectangular plate-like members having a long axial length. The mirrors 11000 and 11100 and the holder 1900 can be joined to each other by an adhesive.

[0211] Figure 9 is a perspective view showing the connecting member 1800, Figures 9 to 11 is Figure 12 is a bottom view of the connecting member 1800 shown in Figure 13 is Figure 12 is a side view of the connecting member 1800 shown in.

[0212] Referring to Figure 14 , the connecting member 1800 includes a first surface 1801 and a second surface 1802. The first surface 1801 can correspond to one surface of the cylindrical connecting member 1800, and the second surface 1802 can correspond to the other surface of the cylindrical connecting member 1800. The first surface 1801 and the second surface 1802 are disposed to face each other. The first surface 1801 and the second surface 1802 can each be disposed on a plane perpendicular to the axial direction.

[0213] The connecting member 1800 can include a third hole 1820 and a sixth hole 1810. The sixth hole 1810 is a hole through which the shaft 1100 passes. An inner diameter of the sixth hole 1810 can be set to be larger than an outer diameter of the shaft 1100. The sixth hole 1810 is disposed at the center of the connecting member 1800. The third hole 1820 is a portion into which the fastening member 11 is fastened. The third hole 1820 is disposed by penetrating the first surface 1801 and the second surface 1802. A thread can be formed on an inner surface of the third hole 1820. A plurality of third holes 1820 can be provided. The plurality of third holes 1820 can be disposed at equal intervals in a circumferential direction of the connecting member 1800.

[0214] The connecting member 1800 can include a protrusion 1830. The protrusion 1830 protrudes from the second surface 1802. The protrusion 1830 can be a ring-shaped member. The protrusion 1830 is a portion that is press-fitted into the first hole 1213a of the yoke 1210. A portion of the protrusion 1830 can be disposed to overlap the third hole 1820. This takes into account the positions of the first hole 1213a and the second hole 1213b of the yoke 1210.

[0215] Figure 12 is Figures 12 to 14 an enlarged side view of part A of

[0216] Referring to Figure 15 , the first surface 1801 of the connection member 1800 is in contact with the lower surface of the third member 1930 of the holder 1900. The second surface 1802 of the connection member 1800 is in contact with the upper surface of the yoke 1210. The connection member 1800 is disposed between the yoke 1210 and the third member 1930 of the holder 1900 based on the axial direction.

[0217] The fastening member 11 passes through the third member 1930 of the holder 1900 and is fastened to the third hole 1820 of the connection member 1800. When the fastening member 11 is rotatably fastened to the third hole 1820, the holder 1900 and the connection member 1800 are engaged with each other.

[0218] The protrusion 1830 of the connection member 1800 can be press-fitted into the first hole 1213a of the yoke 1210. When the protrusion 1830 is press-fitted into the first hole 1213a, the connection member 1800 and the yoke 1210 are engaged with each other. As a result, the holder 1900 and the yoke 1210 are engaged through the connection member 1800. Since the holder 1900 is engaged with the yoke 1210 through the connection member 1800 as a single component, assembly is facilitated.

[0219] The fastening member 11 is disposed to pass through the connection member 1800 and the third member 1930 of the holder 1900. In addition, the end portion of the fastening member 11 can be disposed to pass through the second hole 1213b of the yoke 1210. In this case, the end portion of the fastening member 11 can be disposed such that a portion of the fastening member 11 overlaps the second hole 1213b in the radial direction. Accordingly, in the rotational direction, the connection member 1800 and the rotor 1200 are bound to each other by the end portion of the fastening member 11, thereby preventing slippage between the connection member 1800 and the rotor 1200.

[0220] Figure 11 is a view showing the yoke 1210.

[0221] Referring to Figure 15 , the yoke 1210 can include a base 1211, a magnet accommodation portion 1212, and a column portion 1213. The yoke 1210 can be a cylindrical member that is open overall on one side thereof and on the other side thereof. The magnet accommodation portion 1212 can protrude from the base 1211. The column portion 1213 can protrude from the magnet accommodation portion 1212. The base 1211, the magnet accommodation portion 1212, and the column portion 1213 can have different inner diameters. The inner diameter of the base 1211 can be greater than the inner diameter of the magnet accommodation portion 1212. The inner diameter of the magnet accommodation portion 1212 can be greater than the inner diameter of the column portion 1213.

[0222] The sensing magnet 1230 is disposed in the inside of the base 1211. The driving magnet 1220 is disposed in the inside of the magnet accommodation portion 1212. A portion of the bearing housing 1500 can be disposed in the inside of the column portion 1213. One end surface of the column portion 1213 is in contact with one end surface of the connection member 1800 in the axial direction. A first hole 1213a through which the shaft 1100 passes can be disposed on one surface of the column portion 1213. The protrusion 1830 of the connection member 1800 is press-fitted into the first hole 1213a.

[0223] The column portion 1213 can be disposed to overlap the holder 1900 in the radial direction. The column portion 1213 can be disposed to overlap the first mirror 11000 and the second mirror 11100 in the radial direction. Such a shape of the yoke 1210 is considered in view of the characteristics of the shaft 1100, the first mirror 11000, and the second mirror 11100 which are elongated in the axial direction.

[0224] The yoke 1210 can include a second hole 1213b. An end portion of the fastening member 11 is disposed in the second hole 1213b. Since the end portion of the fastening member 11 is disposed to pass through the second hole 1213b, the yoke 1210 and the connection member 1800 are bound to each other in the rotational direction. A plurality of second holes 1213b can be disposed. The number of the second holes 1213b can correspond to the number of the fastening members 11. The second hole 1213b can be recessed in the radial direction at the edge of the first hole 1213a.

[0225] Figure 16 FIG. 19 is a view showing the holder 1900.

[0226] Reference Figure 16 The holder 1900 can include a first member 1910, a second member 1920, a third member 1930, and a side wall 1950. The first member 1910 is engaged with the first mirror 11000. The second member 1920 is engaged with the second mirror 11100. The third member 1930 connects the first member 1910 with the second member 1920. The side wall 1950 can be disposed between the first member 1910 and the second member 1920. The first member 1910 can include a third surface 1901 which is in contact with the first mirror 11000. The second member 1920 can include a fourth surface 1902 which is in contact with the second mirror 11100. The third surface 1901 and the fourth surface 1902 can be disposed to face each other. In addition, the third surface 1901 and the fourth surface 1902 can be elongated in the axial direction.

[0227] Due to the hollow space inside the holder 1900, the first surface 1801 can be divided into a horizontal area 1900A which contacts a partial area of the first mirror 11000 and a vertical area 1900B. The second surface 1802 can also be divided into a horizontal area 1900A which contacts a partial area of the second mirror 11100 and a vertical area 1900B.

[0228] The holder 1900 can include a first groove 1940A and a second groove 1940B which are coated with an adhesive. The first groove 1940A is recessed formed in the third surface 1901. An axial length k1 of the first groove 1940A can be greater than a width direction length w1. The first groove 1940A can be disposed in the vertical area 1900B of the first surface 1801. The second groove 1940B is recessed formed in the fourth surface 1902. An axial length k1 of the second groove 1940B can be greater than a width direction length w1. The second groove 1940B can be disposed in the vertical area 1900B of the second surface 1802.

[0229] The first mirror 11000 and the second mirror 11100 have a rectangular structure with a relatively long axial length in consideration of a scanning range. Accordingly, when the first groove 1940A and the second groove 1940B which are coated with an adhesive are elongated in the axial direction, there are advantages of increasing the bonding force between the first mirror 11000 and the second mirror 11100 and the holder 1900, and also of easily applying the adhesive to the holder 1900 and easily curing the adhesive.

[0230] The holder 1900 can be manufactured by die casting using aluminum which can relatively reduce weight.

[0231] Figure 17 is a cross-sectional view of the holder 1900 taken along Figure 17 line A-A.

[0232] Referring to Figure 18 , the third member 1930 of the holder 1900 is disposed in a direction perpendicular to the axial direction and connects the first member 1910 and the second member 1920. The third member 1930 can include a fourth hole 1960 and a fifth hole 1970. The fourth hole 1960 is a portion through which the shaft 1100 passes, and an inner diameter of the fourth hole 1960 is set to be greater than an outer diameter of the shaft 1100. The shaft 1100 can pass through the fourth hole 1960, and an end portion of the shaft 1100 can protrude above an upper surface of the third member 1930.

[0233] The fifth hole 1970 is a portion through which the fastening member 11 passes, and an inner diameter of the fifth hole 1970 is set to be greater than an outer diameter of the shaft 1100. In a state in which the fastening member 11 passes through the fifth hole 1970 and is fastened to the connection member 1800, the head of the fastening member 11 can be in contact with the upper surface of the third member 1930. The second hole 1213b, the third hole 1820, and the fifth hole 1970 can be disposed to correspond to each other in the axial direction. The end portion of the fastening member 11 passing through the fifth hole 1970 and the third hole 1820 is disposed in the second hole 1213b.

[0234] Figure 17 is a cross-sectional view of the holder 1900 taken along a line B-B of Figure 18

[0235] Referring to Figure 19 The first member 1910 can include a fifth surface 1903 disposed to face the third surface 1901. A third recess 1903a can be disposed on the fifth surface 1903. The third recess 1903a can be recessedly formed on the fifth surface 1903 toward the third surface 1901, and can be formed as a curved surface. The second member 1920 can include a sixth surface 1904 disposed to face the fourth surface 1902. A fourth recess 1904a can be disposed on the sixth surface 1904. The fourth recess 1904a can be recessedly formed on the sixth surface 1904 toward the fourth surface 1902, and can be formed as a curved surface.

[0236] A portion of the yoke 1210 can be disposed in the third recess 1903a. Also, another portion of the yoke 1210 can be disposed in the fourth recess 1904a. Due to the third recess 1903a and the fourth recess 1904a, there is an advantage that the size of the yoke 1210 can be secured while reducing the size of the holder 1900.

[0237] Figure 17 is a perspective view illustrating a motor according to an embodiment, Figure 19 is an exploded perspective view of the motor shown in Figure 20 Figure 21 is a side cross-sectional view of the motor shown in Figure 20 In the following, the inner side is a direction facing the shaft 100 based on a radial direction of the motor, and the outer side is a direction opposite to the inner side.

[0238] Referring to Figure 22 The motor according to an embodiment can include a shaft 2100, a rotor 2200, a stator 2300, a substrate 2400, a base 2500, a bearing housing 2600, and a bearing 2700.

[0239] ​​The shaft 2100 rotates together with the rotor 2200. A head of the shaft 2100 can be connected to a sensor device that acquires distance information.

[0240] The rotor 2200 can include a yoke 2210 and a magnet 2220.

[0241] The yoke 2210 is disposed in the outer side of the stator 2300. Also, the yoke 2210 is engaged with the shaft 2100. The shaft 2100 is disposed at the center of the yoke 2210. As the yoke 2210 rotates, the shaft 2100 also rotates.

[0242] The magnet 2220 can be disposed in the yoke 2210. The magnet 2220 serves to drive the yoke 2210. The yoke 2210 rotates by electromagnetic interaction between the magnet 2220 and a coil wound around the stator 2300. The magnet 2220 can be one annular member. Alternatively, the magnet 2220 can be a combination of a plurality of divided magnets.

[0243] The stator 2300 is disposed outside the shaft 2100. The stator 2300 includes a stator core 2310. The stator core 2310 includes a plurality of teeth. A coil is wound on the teeth. The stator 2300 can include an insulator 2320. The insulator 2320 is engaged with the stator core 2310.

[0244] A substrate 2400 is disposed on one side of the yoke 2210. The substrate 2400 can include a sensor 2410( Figure 20 ) and a coil 2420( Figures 20 to 22 ). The sensor 2410 can be an inductive encoder. An air gap is formed between the substrate 2400 and the yoke 2310 in the axial direction. The coil 2420 can be a pattern coil.

[0245] A base 2500 is disposed on one side of the substrate 2400. For example, the substrate 2400 can be disposed on the upper surface of the base 2500. An adhesive film for engaging the base 2500 to the substrate 2400 can be disposed between the base 2500 and the substrate 2400.

[0246] A bearing housing 2600 includes a bearing 2700 inside. The bearing 2700 rotatably supports the shaft 2100. Two bearings 2700 can be disposed in the upper and lower portions of the bearing housing 2600, respectively. The bearing housing 2600 can be engaged with the base 2500. Alternatively, the bearing housing 2600 and the base 2500 can be integrated with each other.

[0247] The bearing housing 2600 can include a first accommodation portion 2610 and a second accommodation portion 2620 therein. The bearing 2700 is disposed in the first accommodation portion 2610. The bearing 2700 is also disposed in the second accommodation portion 2620. A partition wall 2630 can be disposed between the first accommodation portion 2610 and the second accommodation portion 2620. The partition wall 2630 protrudes from the inside of the bearing housing 2600 to separate the first accommodation portion 2610 and the second accommodation portion 2620, and support the outer ring of the bearing 2700 in the axial direction.

[0248] Meanwhile, the bearing housing 2600 is fixed to the base 2500, and the bearing housing 2600 is engaged with the center of the stator core 2310 of the stator 2300.

[0249] Figure 25 is a view showing Figure 25 the yoke 2210 of the motor shown.

[0250] Referring to Figure 23 and 23 , the yoke 2210 includes a cylindrical body 2211 and a flange 2212. One side of the body 2211 is blocked by an upper surface, and the other side of the body 2211 is open. The flange 2212 has a shape extending horizontally outward from one end of the body 2211. The shaft 2100 is engaged with the upper surface of the body 2211, and the shaft 2100 and the yoke 2210 integrally rotate. A hole is provided at the center of the upper surface of the body 2211. The end portion of the shaft 2100 can be press-fitted and engaged into the hole.

[0251] The magnet 2220 is engaged with the inner circumferential surface of the body 2211. Meanwhile, the thickness t of the body 2211 can be the same as the thickness t of the flange 2212.

[0252] The flange 2212 includes a first edge 2212a, a second edge 2212b, and a third edge 2212c. The first edge 2212a and the second edge 2212b are alternately disposed in the circumferential direction of the yoke 2210. In the radial direction of the yoke 2210, the second edge 2212b is disposed closer to the body 2211 than the first edge 2212a. The third edge 2212c connects the first edge 2212a and the second edge 2212b. Since the first edge 2212a and the second edge 2212b are alternately disposed in the circumferential direction of the yoke 2210, the flange 2212 can have a shape having a plurality of blades protruding from the body 2211.

[0253] The flange 2212 interacts with the coil 2420 provided on the substrate 2400 to generate an induced electromotive force. Since the shape of the flange 2212 varies along the circumferential direction of the yoke 2210, the deviation of the induced electromotive force occurs intermittently, and the sensor 2410 senses this phenomenon and utilizes it to identify one rotation of the rotor 2200.

[0254] Meanwhile, the flange 2212 can be provided to overlap the magnet 2220 in the radial direction of the yoke 2210. Also, the flange 2212 can be provided to overlap the bearing housing 2600 in the radial direction of the yoke 2210.

[0255] Figure 20 is a plan view of the yoke 2210. Figure 22

[0256] Referring to Figure 24 The first edge 2212a and the second edge 2212b can be curved surfaces with the center C of the yoke 2210 as a center of curvature. Also, the second edge 2212b can be provided on the outer circumferential surface of the body 2211. The third edge 2212c can be a flat surface provided in the radial direction of the yoke 2210.

[0257] As described above, although the shape of the flange 2212 of the yoke 2210 is illustrated, the present application is not limited thereto, and the second edge 2212b can be provided to protrude more than the outer circumferential surface of the body 2211. Also, since the first edge 2212a and the second edge 2212b are alternately repeated, the shape of the flange 2212 is a shape in which square teeth are repeated, but the present application is not limited thereto, and the flange 2212 can be implemented as a flange in which various shapes of protruding structures are repeated. For example, the first edge 2212a and the second edge 2212b can not be curved surfaces but flat surfaces, and at the same time, the third edge 2212c can be provided to be more inclined than the radial direction of the yoke 2210.

[0258] Meanwhile, the plurality of first edges 2212a can have the same circumferential length L12. The plurality of second edges 2212b can also have the same circumferential length L22. Also, the plurality of first edges 2212a can be provided on one circular track based on the center C of the yoke 2210. The plurality of second edges 2212b can also be provided on one circular track based on the center C of the yoke 2210.

[0259] The number of the first edge 2212a and the second edge 2212b can be variously controlled to correspond to the resolution of the sensor 2410.

[0260] Figure 23 is a view showing the substrate 2400.

[0261] Referring to Figures 22 to 24 and​25 Sensor 2410 and coil 2420 are disposed in substrate 2400. Sensor 2410 is electrically connected to coil 2420 to measure the change in induced electromotive force according to the rotation of substrate 2400. Coil 2420 may be a combination of a first coil 2421 and a second coil 2422 with different shapes and sizes. For example, the first coil 2421 may be radial, while the second coil 2422 may be ring-shaped. The first coil 2421 and the second coil 2422 are independently separated from each other and may be disposed on different layers of substrate 2400.

[0262] The substrate 2400 may be circular, and the coil 2420 may be configured to be centrally symmetric about the substrate 2400. For example, the coil 2420 may be configured to be rotationally symmetric about the center of the substrate 2400.

[0263] Figure 25 This is a view of coil 2420 and flange 2212 in the axial direction.

[0264] refer to Figure 22 and 26 The coil 2420 is configured to face the flange 2212. A portion of the coil 2420 may be positioned between a first edge 2212a and a second edge 2212b of the flange 2212, based on the radial direction of the yoke 2210. In this case, the first edge 2212a may be positioned on the outside of the coil 2420.

[0265] When the rotor 2300 rotates due to the electrical interaction between the coil wound around the stator core 2310 and the magnet 2320, a magnetic induction is generated between the coil 2420 and the flange 2212 of the yoke 2210 due to the shape of the flange 2212 of the rotor 2300, and the sensor 2410 senses the change in magnetic induction. In this way, when sensing the position of the rotor 2200, the configuration of the motor can be greatly simplified by utilizing the flange 2212 and the coil 2420, which are part of the yoke 2210.

[0266] In particular, since no sensing magnet is used, there is an advantage in that there is no magnetic field interference with the driving magnet. Furthermore, the electromotive force generated by the coil 2420 of the substrate 2400 can significantly reduce external magnetic field interference.

[0267] Figure 26 This is a perspective view showing an electric motor according to one embodiment. Figure 22 yes Figure 27 The exploded perspective view of the motor shown. Figure 28 It is along Figure 27 The image shows a side sectional view of the motor taken along line A3-A3. In the following text, the inner side refers to the direction of the motor's radial direction toward axis 3100, and the outer side refers to the direction opposite to the inner side.

[0268] Reference Figure 29 The motor according to the embodiment can include a shaft 3100, a rotor 3200, and a stator 3300.

[0269] The shaft 3100 is engaged with a yoke 3210 of the rotor 3200. The shaft 3100 can be press-fitted and engaged to the yoke 3210. Alternatively, the shaft 3100 can be integrated with the yoke 3210. The shaft 3100 rotates together with the rotor 3200. The shaft 3100 is rotatably supported by a bearing 3700 disposed inside a bearing housing 3500.

[0270] The rotor 3200 can include the yoke 3210, a driving magnet 3220, and a sensing magnet 3230.

[0271] The yoke 3210 is engaged to the shaft 3100. The shaft 3100 can be disposed at the center of the yoke 3210.

[0272] The driving magnet 3220 serves to rotate the yoke 3210. The driving magnet 3220 can be disposed on an inner surface of the yoke 3210. The driving magnet 3220 can be disposed to face the stator 3300 in a radial direction of the rotor 3200. When an electrical interaction occurs between the driving magnet 3220 and a coil of the stator 3300, the yoke 3210 rotates. The driving magnet 3220 can be a combination of a plurality of unit magnets. Alternatively, the driving magnet 3220 can be a single part having a ring shape.

[0273] The sensing magnet 3230 serves to accurately identify a position of the rotor 3200. The sensing magnet 3230 can be disposed on the inner surface of the yoke 3210. In addition, the sensing magnet 3230 can be disposed to face a substrate 3400 in an axial direction.

[0274] The stator 3300 can be disposed between the shaft 3100 and the yoke 3210. The stator 3300 can be fixed to an outer surface of the bearing housing 3500. The stator 3300 includes a core of the stator having a plurality of teeth, and a coil can be wound around each tooth. The teeth can include an insulator configured to insulate the coil and the core of the stator.

[0275] The substrate 3400 is disposed at one side of the yoke 3210. The substrate 3400 can include a sensor 3410. The sensor 3410 can be a Hall IC or an encoder IC that senses a change in a magnetic flux of the sensing magnet 3230. The sensor 3410 can be disposed to face the driving magnet 3220 or the sensing magnet 3230 in the axial direction.

[0276] The bearing housing 3500 is a member that fixes the first bearing 3700A and the second bearing 3700B and forms a shaft system. The bearing housing 3500 can include an area such as a cylindrical member that is elongated in the axial direction.

[0277] The bearing housing 3500 is fixed to the plate 3600. Although the plate 3600 and the bearing housing 3500 are separately shown, the plate 3600 and the bearing housing 3500 can be integrated with each other. The base plate 3400 can be mounted on one surface of the plate 3600.

[0278] The first bearing 3700A can be disposed at the outer side of the bearing housing 3500. The first bearing 3700A rotatably supports the yoke 3210.

[0279] The second bearing 3700B can be disposed at the inner side of the bearing housing 3500. The second bearing 3700B rotatably supports the shaft 3100.

[0280] Each of the first bearing 3700A and the second bearing 3700B can be disposed not to overlap the stator 3300 in the radial direction of the motor. For example, the first bearing 3700A can be disposed higher than the stator 3300 and the second bearing 3700B can be disposed lower than the stator 3300 based on the axial direction. Also, the first bearing 3700A can be disposed higher than the driving magnet 3220 based on the axial direction.

[0281] The connection member 3800 is a member that joins the yoke 3210 with the holder 3900. The connection member 3800 is disposed between the yoke 3210 and the holder 3900 in the axial direction and joins the yoke 3210 with the holder 3900. When the yoke 3210 rotates, the connection member 3800 rotates and the holder 3900 rotates together. The connection member 3800 can be a cylindrical member. One surface of the connection member 3800 can be in contact with the yoke 3210 and the other surface of the connection member 3800 can be in contact with the holder 3900 in the axial direction.

[0282] The holder 3900 fixes the mirrors 31000 and 31100. Also, the holder 3900 is joined to the connection member 3800 and rotates together with the yoke 3210. The holder 3900 can be a member made of a frame such that the inside of its cross section is empty. The holder 3900 having such a shape is resistant to bending and has the advantage of greatly reducing weight. The first mirror 31000 and the second mirror 31100 can be disposed to face each other on one surface and the other surface of the holder 3900. The holder 3900 can be disposed to overlap each of the first mirror 31000 and the second mirror 31100 in the radial direction.

[0283] The mirrors 31000 and 31100 are used to reflect laser light that is irradiated to an object to be sensed. The mirrors 31000 and 31100 can include a first mirror 31000 provided on one surface of the holder 3900 and a second mirror 31100 provided on the other surface of the holder 3900. When the yoke 3210 is rotated, the holder 3900 is rotated, and as the holder 3900 is rotated, the mirrors 31000 and 31100 are rotated together. The mirrors 31000 and 31100 can be rectangular plate-like members having a long axial length. The mirrors 31000 and 31100 and the holder 3900 can be joined to each other by an adhesive.

[0284] Figure 27 is a perspective view illustrating a connection member 3800, Figures 27 to 29 is Figure 30 is a bottom view of the connection member 3800 illustrated in Figure 31 is Figure 30 is a side view of the connection member 3800 illustrated in

[0285] Referring to Figure 32 , the connection member 3800 includes a first surface 3801 and a second surface 3802. The first surface 3801 can correspond to one surface of the cylindrical connection member 3800, and the second surface 3802 can correspond to the other surface of the cylindrical connection member 3800. The first surface 3801 and the second surface 3802 are disposed to face each other. Each of the first surface 3801 and the second surface 3802 can be disposed on a plane perpendicular to the axial direction.

[0286] The connection member 3800 can include a third hole 3820 and a sixth hole 3810. The sixth hole 3810 is a hole through which the shaft 3100 passes. An inner diameter of the sixth hole 3810 is set to be larger than an outer diameter of the shaft 3100. The sixth hole 3810 is disposed at the center of the connection member 3800. The third hole 3820 is a portion in which the fastening member 13 is fastened. The third hole 3820 is disposed by penetrating the first surface 3801 and the second surface 3802. A thread piece can be formed on an inner surface of the third hole 3820. A plurality of third holes 3820 can be provided. The plurality of third holes 3820 can be disposed at equal intervals along a circumferential direction of the connection member 3800.

[0287] The connection member 3800 can include a protrusion 3830. The protrusion 3830 protrudes from the second surface 3802. The protrusion 3830 can be a ring-shaped member. The protrusion 3830 is a portion that is press-fitted into the first hole 3213a of the yoke 3210. A portion of the protrusion 3830 can be disposed to overlap the third hole 3820. This takes into account the positions of the first hole 3213a and the second hole 3213b of the yoke 3210.

[0288] Figure 30 is Figures 30 to 32 an enlarged side view of part A3 of

[0289] Referring to Figure 33 , the first surface 3801 of the connection member 3800 is in contact with the lower surface of the third member 3930 of the holder 3900. The second surface 3802 of the connection member 3800 is in contact with the upper surface of the yoke 3210. The connection member 3800 is disposed between the yoke 3210 and the third member 3930 of the holder 3900 based on the axial direction.

[0290] The fastening member 13 passes through the third member 3930 of the holder 3900 and is fastened to the third hole 3820 of the connection member 3800. When the fastening member 13 is rotatably fastened to the third hole 3820, the holder 3900 and the connection member 3800 are engaged with each other.

[0291] The protrusion 3830 of the connection member 3800 can be press-fitted into the first hole 3213a of the yoke 3210. When the protrusion 3830 is press-fitted into the first hole 3213a, the connection member 3800 and the yoke 3210 are engaged with each other. As a result, the holder 3900 and the yoke 3210 are engaged by the connection member 3800. Since the holder 3900 is engaged to the yoke 3210 by the connection member 3800 as a single component, this facilitates assembly.

[0292] The fastening member 13 is disposed to pass through the connection member 3800 and the third member 3930 of the holder 3900. In addition, the end of the fastening member 13 can be disposed to pass through the second hole 3213b of the yoke 3210. In this case, the end of the fastening member 13 can be disposed such that a portion of the fastening member 13 overlaps the second hole 3213b in the radial direction. Thus, in the rotational direction, the connection member 3800 and the rotor 3200 are bound to each other by the end of the fastening member 13, thereby preventing the slippage between the connection member 3800 and the rotor 3200.

[0293] Figure 29 is a view showing the yoke 3210.

[0294] Referring to Figure 33 , the yoke 3210 can include a base 3211, a magnet accommodation portion 3212, and a column portion 3213. The yoke 3210 can be a cylindrical member that is open overall on one side and the other side. The magnet accommodation portion 3212 can protrude from the base 3211. The column portion 3213 can protrude from the magnet accommodation portion 3212. The base 3211, the magnet accommodation portion 3212, and the column portion 3213 can have different inner diameters. The inner diameter of the base 3211 can be greater than the inner diameter of the magnet accommodation portion 3212. The inner diameter of the magnet accommodation portion 3212 can be greater than the inner diameter of the column portion 3213.

[0295] The sensing magnet 3230 is disposed inside the base 3211. The driving magnet 3220 is disposed inside the magnet housing portion 3212. A portion of the bearing housing 3500 can be disposed inside the column portion 3213. One end surface of the column portion 3213 is in contact with one end surface of the connection member 3800 in the axial direction. A first hole 3213a through which the shaft 3100 passes can be disposed on one surface of the column portion 3213. The protrusion 3830 of the connection member 3800 is press-fitted into the first hole 3213a.

[0296] The column portion 3213 can be disposed to overlap the retainer 3900 in the radial direction. The column portion 3213 can be disposed to overlap the first mirror 31000 and the second mirror 31100 in the radial direction. The shape of the yoke 3210 can take into account the characteristics of the shaft 3100, the first mirror 31000, and the second mirror 31100 that are elongated in the axial direction.

[0297] The yoke 3210 can include a second hole 3213b. The end portion of the fastening member 13 is located in the second hole 3213b. Since the end portion of the fastening member 13 is disposed to pass through the second hole 3213b, the yoke 3210 and the connection member 3800 are bound to each other in the rotational direction. A plurality of second holes 3213b can be provided. The number of the second holes 3213b can correspond to the number of the fastening members 13. The second hole 3213b can be recessedly formed at the edge of the first hole 3213a in the radial direction.

[0298] Figure 34 is a perspective view showing the bearing housing 3500, Figure 34 is a side cross-sectional view of the bearing housing 3500 taken along the line B3-B3 of Figure 35 .

[0299] Referring to Figure 36 and Figure 35 , the bearing housing 3500 can include a first region 3510 in contact with the stator 3300, a second region 3520 in contact with the first bearing 3700A, and a third region 3530 in contact with the second bearing 3700B.

[0300] The first region 3510 is disposed on one side of the second region 3520 in the axial direction, and the third region 3530 is disposed on the other side of the first region 3510. The bearing housing 3500 is provided with a hole 3501 at the center thereof. The shaft 3100 is disposed inside the hole 3501. In addition, the bearing housing 3500 can include an accommodation space S that accommodates the second bearing 3700B. The hole 3501 and the accommodation space S communicate with each other.

[0301] The outer diameter D13 of the first region 3510 can be greater than the outer diameter D23 of the second region 3520. Also, the inner diameter D33 of the third region 3530 can be greater than the outer diameter D13 of the first region 3510.

[0302] The structure of the bearing housing 3500 serves to increase the axial length of the mirrors 31000 and 31100 by arranging the stator 3300 to overlap the mirrors 31000 and 31100 in the radial direction.

[0303] Reference Figure 35 is an enlarged side view of part B3 of Figure 36

[0304] The motor according to one embodiment has the advantage of improving sensing performance by increasing the axial length of the mirrors 31000 and 31100. To secure the axial length of the mirrors 31000 and 31100, it is necessary to reduce the outer diameter of the stator 3300 so that the stator 3300 is disposed inside the mirrors 31000 and 31100. However, when the outer diameter of the stator 3300 is reduced, the winding space of the coil for securing torque is reduced. Therefore, the inner diameter of the stator 3300 is reduced to sufficiently secure the winding space of the coil.

[0305] When the inner diameter of the stator 3300 is reduced, the outer diameter of the bearing housing 3500 is also reduced, and thus, the bearing installation space, which is disposed between the inner surface of the bearing housing 3500 and the shaft 3100, is narrowed, resulting in becoming difficult to install the bearing. Reference Figure 37 Unlike the second bearing 3700B, which is disposed between the shaft 3100 and the bearing housing 3500, the first bearing 3700A is disposed between the bearing housing 3500 and the yoke in order to solve this problem. When the first bearing 3700A is disposed outside the bearing housing 3500, a bearing having a relatively large size can be installed. Therefore, the robustness of the shaft structure can be greatly improved. Also, since the second bearing 3700B supports the shaft 3100 and the first bearing 3700A directly supports the yoke 3210, the robustness of the shaft structure can be further improved.

[0306] In particular, the above-described structure will be described in more detail hereinafter.

[0307] The first bearing 3700A is disposed to overlap the mirrors 31000 and 31100 in the radial direction. On the other hand, the second bearing 3700B is disposed not to overlap the mirrors 31000 and 31100 in the radial direction. The inner diameter D93 of the first bearing 3700A is greater than the inner diameter D83 of the second bearing 3700B. This is because the inner ring of the first bearing 3700A is fixed to the bearing housing 3500, and the inner ring of the second bearing 3700B is fixed to the shaft.

[0308] ​The magnet housing portion 3212 is disposed to overlap the mirrors 31000 and 31100 in the radial direction. The outer diameter D43 of the magnet housing portion 3212 is larger than the outer diameter D53 of the column portion 3213. Further, the outer diameter D43 of the magnet housing portion 3212 is smaller than the shortest distance L between the first mirror 31000 and the second mirror 31100. The inner diameter D73 of the stator 3300 is smaller than the outer diameter D63 of the first bearing 3700A. This is to position the stator 3300 between the first mirror 31000 and the second mirror 31100.

[0309] Meanwhile, the drive magnet 3220 of the rotor 3200 is disposed to overlap the first mirror 31000 and the second mirror 31100 in the radial direction.

[0310] Figure 29 is a view showing the holder 3900.

[0311] Reference Figure 37 The holder 3900 can include a first member 3910, a second member 3920, a third member 3930, and a side wall 3950. The first member 3910 is joined to the first mirror 31000. The second member 3920 is joined to the second mirror 31100. The third member 3930 connects the first member 3910 with the second member 3920. The side wall 3950 can be disposed between the first member 3910 and the second member 3920. The first member 3910 can include a third surface 3901 in contact with the first mirror 31000. The second member 3920 can include a fourth surface 3902 in contact with the second mirror 31100. The third surface 3901 and the fourth surface 3902 can be disposed to face each other. Further, the third surface 3901 and the fourth surface 3902 can be elongated in the axial direction.

[0312] Due to the hollow space inside the holder 3900, the first surface 3801 can be divided into a horizontal region 3900A in contact with a partial region of the first mirror 31000 and a vertical region 3900B. The second surface 3802 can also be divided into a horizontal region 3900A in contact with a partial region of the second mirror 31100 and a vertical region 3900B.

[0313] The holder 3900 can include the first groove 3940A and the second groove 3940B to which the adhesive is applied. The first groove 3940A is recessed on the third surface 3901. The axial length k13 of the first groove 3940A can be greater than the width direction length w13. The first groove 3940A can be disposed in the vertical region 3900B of the first surface 3801. The second groove 3940B is recessed on the fourth surface 3902. The axial length k13 of the second groove 3940B can be greater than the width direction length w13. The second groove 3940B can be disposed in the vertical region 3900B of the second surface 3802.

[0314] The first mirror 31000 and the second mirror 31100 are rectangular structures having relatively long axial lengths in consideration of the scan range. Accordingly, when the first groove 3940A and the second groove 3940B to which the adhesive is applied are elongated in the axial direction, there are advantages of increasing the engagement force between the first mirror 31000 and the second mirror 31100 and the holder 3900, and also of easily applying the adhesive to the holder 3900 and easily curing the adhesive.

[0315] The holder 3900 can be manufactured by die casting using aluminum which can relatively reduce weight.

[0316] Figure 38 is a cross-sectional view of the holder 3900 taken along a line C3-C3 of Figure 38 is a cross-sectional view of the holder 3900 taken along a line C3-C3 of

[0317] Referring to Figure 39 The third member 3930 of the holder 3900 is disposed in a direction perpendicular to the axial direction and connects the first member 3910 and the second member 3920. The third member 3930 can include a fourth hole 3960 and a fifth hole 3970. The fourth hole 3960 is a portion through which the shaft 3100 passes, and an inner diameter of the fourth hole 3960 is set to be greater than an outer diameter of the shaft 3100. The shaft 3100 can pass through the fourth hole 3960, and an end portion of the shaft 3100 can protrude above an upper surface of the third member 3930.

[0318] The fifth hole 3970 is a portion through which the fastening member 13 passes, and an inner diameter of the fifth hole 3970 is set to be greater than the outer diameter of the shaft 3100. In a state in which the fastening member 13 passes through the fifth hole 3970 and is fastened to the connection member 3800, a head portion of the fastening member 13 can be in contact with the upper surface of the third member 3930. The second hole 3213b, the third hole 3820, and the fifth hole 3970 can be disposed to correspond in the axial direction. An end portion of the fastening member 13 passing through the fifth hole 3970 and the third hole 3820 is disposed in the second hole 3213b.

[0319] Figure 38It is along Figure 39 A sectional view of retainer 3900 taken from line D3-D3.

[0320] refer to Figure 40 The first member 3910 may include a fifth surface 3903 configured to face the third surface 3901. A third groove 3903a may be provided on the fifth surface 3903. The third groove 3903a may be recessed in the fifth surface 3903 toward the third surface 3901 and may be formed as a curved surface. The second member 3920 may include a sixth surface 3904 configured to face the fourth surface 3902. A fourth groove 3904a may be provided on the sixth surface 3904. The fourth groove 3904a may be recessed in the sixth surface 3904 toward the fourth surface 3902 and may be formed as a curved surface.

[0321] A portion of the yoke 3210 can be disposed in the third groove 3903a. Furthermore, another portion of the yoke 3210 can be disposed in the fourth groove 3904a. Due to the third groove 3903a and the fourth groove 3904a, it is advantageous to ensure the dimensions of the yoke 3210 while reducing the dimensions of the retainer 3900.

[0322] Figure 38 This is a perspective view showing an electric motor according to one embodiment. Figure 40 yes Figure 41 The exploded perspective view of the motor shown. Figure 42 It is along Figure 41 The image shows a side sectional view of the motor taken along line A4-A4. In the following text, the inner side is the direction facing axis 4100 based on the radial direction of the motor, and the outer side is the opposite direction to the inner side.

[0323] refer to Figure 43 The motor according to the embodiment may include a shaft 4100, a rotor 4200 and a stator 4300.

[0324] Shaft 4100 engages with yoke 4210 of rotor 4200. Shaft 4100 can be press-fitted and engaged with yoke 4210. Alternatively, shaft 4100 can be integral with yoke 4210. Shaft 4100 rotates together with rotor 4200. Shaft 4100 is rotatably supported by bearing 4700 disposed inside bearing housing 4500.

[0325] The rotor 4200 may include a yoke 4210, a drive magnet 4220, and a sensing magnet 4230.

[0326] The yoke 4210 engages with the shaft 4100. The shaft 4100 may be located at the center of the yoke 4210.

[0327] The driving magnet 4220 serves to rotate the yoke 4210. The driving magnet 4220 can be disposed on the inner surface of the yoke 4210. The driving magnet 4220 can be disposed to face the stator 4300 in the radial direction of the rotor 4200. The yoke 4210 is rotated when an electrical interaction occurs between the driving magnet 4220 and the coil of the stator 4300. The driving magnet 4220 can be a combination of a plurality of unit magnets. Alternatively, the driving magnet 4220 can be a single part having a ring shape.

[0328] The sensing magnet 4230 serves to accurately identify the position of the rotor 4200. The sensing magnet 4230 can be disposed on the inner surface of the yoke 4210. Also, the sensing magnet 4230 can be disposed to face the substrate 4400 in the axial direction.

[0329] The stator 4300 can be disposed between the shaft 4100 and the yoke 4210. The stator 4300 can be fixed to the outer surface of the bearing housing 4500. The stator 4300 includes a core of the stator 4300 having a plurality of teeth, and a coil can be wound around each tooth. The teeth can include an insulator configured to insulate the coil and the core of the stator 4300.

[0330] The substrate 4400 is disposed on one side of the yoke 4210. The substrate 4400 can include a first sensor 4410. The first sensor 4410 can be a Hall IC or an encoder IC that senses a change in the magnetic flux of the sensing magnet 4230. The first sensor 4410 can be disposed to face the sensing magnet 4230 in the axial direction. The substrate 4400 can include a second sensor 4420. The second sensor 4420 can be a Hall IC that senses a change in the magnetic flux of the driving magnet 4220. The second sensor 4420 can be disposed to face the driving magnet 4220 in the axial direction.

[0331] The bearing housing 4500 is a member that fixes the first bearing 4700A and the second bearing 4700B to form a shaft system. The bearing housing 4500 can include an area such as a cylindrical member elongated in the axial direction.

[0332] The bearing housing 4500 is fixed to the plate 4600. Although the plate 4600 and the bearing housing 4500 are separately shown, the plate 4600 and the bearing housing 4500 can be integrated with each other. The substrate 4400 can be mounted on one surface of the plate 4600.

[0333] The first bearing 4700A can support the upper end of the shaft 4100, and the second bearing 4700B can support the lower end of the shaft 4100.

[0334] The connecting member 4800 is a member that joins the yoke 4210 with the holder 4900. The connecting member 4800 is disposed between the yoke 4210 and the holder 4900 in the axial direction, and joins the yoke 4210 with the holder 4900. When the yoke 4210 rotates, the connecting member 4800 rotates, and the holder 4900 rotates together. The connecting member 4800 can be a cylindrical member. In the axial direction, one surface of the connecting member 4800 can be in contact with the yoke 4210, and the other surface of the connecting member 4800 can be in contact with the holder 4900.

[0335] The holder 4900 fixes the mirror 41000. In addition, the holder 4900 is joined to the connecting member 4800, and rotates together with the yoke 4210. The holder 4900 can be a member made of a frame so that the inside of its cross section is hollow. The holder 4900 having such a shape is resistant to bending, and has an advantage of greatly reducing weight. The first mirror 41000A and the second mirror 41100B can be disposed to face each other on one surface and the other surface of the holder 4900. The holder 4900 can be disposed to overlap each of the first mirror 41000A and the second mirror 41100B in the radial direction.

[0336] The mirror 41000 is used to reflect laser light that is irradiated to an object to be sensed. The mirror 41000 can include a first mirror 41000A disposed on one surface of the holder 4900, and a second mirror 41100B disposed on the other surface of the holder 4900. When the yoke 4210 rotates, the holder 4900 rotates, and the mirror 41000 rotates together as the holder 4900 rotates.

[0337] Figure 41 is a perspective view showing a mirror, Figures 41 to 43 is Figure 44 a plan view of the mirror shown in FIG. 10.

[0338] Referring to Figure 45 and Figure 44The mirror 41000 can be a rectangular plate-shaped member having a long axial length. The mirror 41000 can include a rear surface 41100, a side surface 41200, a front surface 41300, an upper surface 41400, and a lower surface 41500. The rear surface 41100 is a surface in contact with the holder 4900. The front surface 41300 is a surface that reflects laser light. The side surface 41200 can be provided on one side and the other side of the mirror 41000, respectively. The side surface 41200 can include a first side surface 41210 and a second side surface 41220. The first side surface 41210 can be a surface provided adjacent to the front surface 41300, and the second side surface 41220 can be a surface provided adjacent to the rear surface 41100. The first side surface 41210 can be provided to be inclined with respect to a surface extending from the front surface 41300. Accordingly, the area of the front surface 41300 can be smaller than the area of the rear surface 41100.

[0339] Figure 44 is a perspective view illustrating a body of the holder 4900.

[0340] Referring to Figure 45 The holder 4900 can include a body 4910. The body 4910 includes first surfaces 4901 in contact with the rear surface 41100 of the mirror 41000. The two first surfaces 4901 can be provided to face each other, and the two first surfaces 4901 can be connected to two side portions 4910A provided to be spaced apart from each other. A fastening hole 4904 can be provided in each of the side portions 4910A. The fastening hole 4904 is used to engage the holder 4900 with the bracket 4920.

[0341] Figure 46 is a perspective view illustrating the bracket 4920 of the holder 4900, Figure 46 is Figure 47 a top plan view of the bracket 4920 illustrated in FIG. 11.

[0342] Referring to Figure 48 and Figure 47 The bracket 4920 is a member that fixes the mirror 41000 and the body 4910 of the holder 4900. In the case where only an adhesive is used, since the engagement force between the holder 4900 and the mirror 41000 is weak, the bracket 4920 is used to additionally fix the holder 4900 and the mirror 41000. The bracket 4920 can include a bracket body 4921 and a clip portion 4922. The bracket body 4921 is fixed to the side portion 4910A of the holder 4900. The bracket body 4921 can have a cross-sectional shape of The fastening hole 4921a is formed in the holder body 4921. The holder body 4921 is engaged with the body 4910 of the holder 4900 by the first bolt 24 or the second bolt 34 passing through the fastening hole 4921a.

[0343] The clip portion 4922 can be provided to be curved outward from the end of the holder body 4921. The clip portion 4922 is an elastically deformable member, which is a portion directly fixing the mirror 41000 by pressing the side surface 41200 of the mirror 41000.

[0344] The clip portion 4922 can be divided into a first region 4922a and a second region 4922b. The first region 4922a is a portion curved vertically from the holder body 4921. The second region 4922b is a portion curved toward the holder body 4921 in the first region 4922a.

[0345] The holder 4900 includes a first protrusion 4902 in contact with the mirror 41000 and fixing the mirror 41000 to the holder 4900. The first protrusion 4902 is formed to protrude more than the first surface 4901. Hereinafter, a surface representing an extended surface of the first surface 4901 is a reference surface L40, and a second region 4922b protruding more than the reference surface L40 in the holder 4920 corresponds to the first protrusion 4902.

[0346] Figure 47 is a plan view of the holder 4900 and the mirror 41000.

[0347] Referring to Figure 48 As the first protrusion 4902, the second region 4922b of the holder 4920 is in contact with the side surface 41200 of the mirror 41000 and fixes the mirror 41000 to the holder 4900. Specifically, the second region 4922b presses the mirror 41000 by being in contact with the inclined first side surface 41210 of the mirror 41000. Since the second region 4922b is inclined to correspond to the first side surface 41210, it is possible to increase the fixing force by pressing the mirror 41000 in a direction toward the holder 4900. At this time, a solder pad in contact with the first side surface 41210 is attached to the second region 4922b, thereby preventing scratching or damage to the first side surface 41210 and preventing vibration, noise, or separation due to a gap between the second region 4922b and the first side surface 41210.

[0348] Figure 49 is a view showing an assembly process of the holder 4900 and the mirror 41000.

[0349] Referring to Figure 49 and 50 As described above,Figure 50 As shown in (a) and (b), the reflector 41000 is primarily fixed to the body 4910 of the retainer 4900 using adhesive. Next, as... Figure 49 As shown in (c) and (d), when the bracket 4920 is installed in the body 4910 of the retainer 4900, the clip portion 4922 of the bracket 4920 presses against the side surface 41200 of the reflector 41000 to additionally secure the reflector 41000 to the body 4910. Next, as... Figure 50 As shown in (e) and (f), when the bracket 4920 is fastened to the body 4910 of the retainer 4900 by the first bolt 24 and the second bolt 34, the reflector 41000 is finally fixed to the retainer 4900.

[0350] Figure 50 This is a view showing the body 4910 of the retainer 4900 according to a modified example. Figure 50 This is a side view of the retainer 4900 based on another modified example. Figure 51 It shows the reflector 41000 and the components disposed therein. Figure 52 Side view of the retainer 4900 of the body 4910 shown.

[0351] refer to Figure 53 In the retainer 4900 according to the modified example, a second protrusion 4905 may be provided on the body 4910 of the retainer 4900. The second protrusion 4905 protrudes beyond the first surface 4901 and contacts the upper surface 41400 or the lower surface 41500 of the reflector 41000. With the first protrusion 4902 supporting the side surface 41200 of the reflector 41000, the second protrusion 4905 supports the upper surface 41400 and the lower surface 41500 of the reflector 41000, thereby more firmly fixing the reflector 41000 to the retainer 4900 and preventing the reflector 41000 from separating from the upper or lower side of the retainer 4900.

[0352] Due to the second protrusion 4905, the height H14 of the reflector 41000 can be greater than the height H24 of the bracket 4920 and less than the height H34 of the retainer 4900.

[0353] Figures 51 to 53 This is a view showing the retainer 4900 and the reflector 41000 according to yet another modified example. Figure 54 yes Figure 55 The perspective view of bracket 4920 shown. Figure 54 yes Figure 56 The top view of bracket 4920 is shown.

[0354] refer to Figure 54, the holder 4900 and the mirror 41000 according to the further modification example are characterized in that the holder 4900 is in contact with the front surface 41300 of the mirror 41000 to fix the mirror 41000. The clip portion 4922 of the holder 4920 of the holder 4900 can include a third region 4922c and a fourth region 4922d. The third region 4922c can be vertically bent at the holder body 4921. The fourth region 4922d can be vertically bent toward the holder body 4921 in the third region 4922c. The fourth region 4922d is in contact with the front surface 41300 of the mirror 41000. The length of the fourth region 4922d can be formed to be relatively much shorter than the length of the third region 4922c. This is to minimize the front surface 41300 of the mirror 41000.

[0355] Figures 54 to 56 is a plan view showing the holder 4900 and the mirror 41000 according to the further modification example,

[0356] Reference Figure 57 The fourth region 4922d of the clip portion 4922 of the holder 4920 can be in contact with the edge of the front surface 41300 of the mirror 41000 and fix the mirror 41000 to the body 4910 of the holder 4900. Since the holder 4920 is in contact with the front surface 41300 of the mirror 41000 and fixes the front surface 41300 of the mirror 41000, the mirror 41000 can be more firmly fixed to the holder 4900 than when the holder 4920 fixes the side surface 41200 of the mirror 41000. Since the fourth region 4922d fixes only a small portion of the front surface 41300 of the mirror 41000 and the height of the holder 4920 is relatively much smaller than the height of the mirror 41000, the mirror 41000 can be fixed to the holder 4900 without significantly affecting the sensing performance.

[0357] Figure 57 is a view showing the holder 4900 and the mirror 41000 according to the further modification example, Figure 58 is Figure 59 is an exploded view of the holder 4900 and the mirror 41000 shown in FIG. 49, and Figure 58 is a plan view of the holder 4900 and the mirror 41000.

[0358] Reference Figure 60(41500), the holder 4900 according to the further modified example is implemented as a first protrusion 4902 in which a portion of the body 4910 supports the side surface 41200 of the mirror 41000. Specifically, the body 4910 can include a first portion 4911 and a second portion 4912. The first portion 4911 and the second portion 4912 are engaged with each other by the first bolt 24 and the second bolt 34. The first portion 4911 and the second portion 4912 can have the same shape and size. The cross section of each of the first portion 4911 and the second portion 4912 can be formed in a square shape.

[0359] The first portion 4911 and the second portion 4912 can be symmetrically disposed based on the width center C of the mirror 41000.

[0360] The first portion 4911 can include a portion of the first surface 4901 that is in contact with the rear surface 41100 of the mirror 41000. The second portion 4912 can include a remaining portion of the first surface 4901 that is in contact with the rear surface 41100 of the mirror 41000.

[0361] The first protrusion 4902 can include a first-1 protrusion 4902A that is in contact with one side surface 41200 of the mirror 41000 and a first-2 protrusion 4902B that is in contact with the other side surface 41200 of the mirror 41000. The first-1 protrusion 4902A is disposed to protrude from one end of the first portion 4911 than the first surface 4901. The first-2 protrusion 4902B is disposed to protrude from an end of the second portion 4912 than the first surface 4901.

[0362] The thickness t14 of the first protrusion 4902 can be equal to the thickness t24 of the mirror 41000.

[0363] The first bolt 24 can be fastened at one side of the first portion 4911 by passing through the first portion 4911 and the second portion 4912. Accordingly, the head of the first bolt 24 is in contact with the first portion 4911. The second bolt 34 can be fastened at one side of the second portion 4912 by passing through the first portion 4911 and the second portion 4912. Accordingly, the head of the second bolt 34 is in contact with the second portion 4912.

[0364] Figures 58 to 60 FIG. 4 is a view showing a holder 4900 and a mirror 41000 according to a further modified example, Figure 61 is a perspective view of the holder 4900 and the mirror 41000 shown in FIG. 4, Figure 62 is an exploded view of the holder 4900 and the mirror 41000 shown in FIG. 4, Figure 61 is a top plan view of the holder 4900 and the mirror 41000.

[0365] REFERENCE Figures 61 to 62 In the holder 4900 according to still another modification example, a part of the body 4910 is implemented as the first protrusion 4902 that supports the side surface 41200 of the mirror 41000; however, the body 4910 is composed of three parts, and the side surface 41200 of the mirror 41000 is provided in a stepped manner.

[0366] Specifically, the body 4910 can include a third part 4913, a fourth part 4914, and a fifth part 4915. The third part 4913 can have a hexahedral block shape including the first surface 4901. The fourth part 4914 and the fifth part 4915 are joined with the third part 4913 by the first bolt 24 and the second bolt 34, respectively. The cross section of each of the fourth part 4914 and the fifth part 4915 can have a cross-sectional shape formed in a The first protrusion 4902 can be provided on the fourth part 4914 and the fifth part 4915, respectively.

[0367] The side surface 41200 of the mirror 41000 can include a third side surface 41200 provided adjacent to the front surface 41300 of the mirror 41000 and a fourth side surface 41200 provided adjacent to the rear surface 41100 of the mirror 41000. The third side surface 41200 and the fourth side surface 41200 are connected to each other by a stepped surface 1250. The first protrusion 4902 can be provided in contact with the stepped surface 1250. That is, a part of the mirror 41000 and a part of the first protrusion 4902 are provided to overlap each other based on the thickness direction of the mirror 41000. The structure of the side surface 41200 of the mirror 41000 and the first protrusion 4902 has the advantage of increasing the engagement force between the mirror 41000 and the holder 4900. In particular, it is possible to prevent the mirror 41000 from being separated in the radial direction of the motor due to centrifugal force.

[0368] The present application can be applied to various devices, such as a vehicle or a home appliance.

Claims

1. An electric motor comprising: a shaft; a rotor engaged with the shaft; a stator disposed between the shaft and the rotor; a bearing disposed between the shaft and the stator; and a base plate, wherein the rotor includes a yoke engaged with the shaft, the base plate includes a body, a first partition wall protruding from the body, and a second partition wall extending from the first partition wall, the first partition wall is disposed between the bearing and the stator, the first partition wall is in contact with a side surface of an outer ring of the bearing, and the second partition wall is in contact with one surface of the outer ring of the bearing, wherein the second partition wall is bent from the first partition wall and formed to overlap the first partition wall in a radial direction, wherein the yoke includes an extension in contact with the shaft, and the second partition wall is formed to overlap the extension in the radial direction, wherein a distance from the body to an upper end of the first partition wall is less than an axial longest distance of the yoke from the body of the base plate. 2.The electric motor of claim 1, wherein the yoke includes a first hole through which the shaft passes, the base plate includes a second hole through which the shaft passes, an inner diameter of the second hole is larger than an inner diameter of the first hole, the shaft is in contact with an inner surface of the first hole, and an outer surface of the bearing is in contact with an inner surface of the second hole. 3.The electric motor of claim 1, further comprising: a connecting member including a first surface and a second surface and disposed on the rotor; a holder disposed on the connecting member; and a mirror engaged with the holder, wherein the rotor includes a yoke engaged with the shaft, and the first surface is in contact with the holder, and the second surface is in contact with the yoke, wherein the connecting member is disposed to overlap the mirror in a radial direction. 4.The electric motor of claim 1, further comprising: a base plate on which a sensor is disposed, wherein the rotor includes a yoke and a magnet engaged with the yoke, the yoke includes a body and a flange extending from the body, the flange includes a plurality of first edges and a plurality of second edges, the plurality of first edges and the plurality of second edges are alternately disposed in a circumferential direction of the yoke, and the second edges are disposed closer to the body than the first edges in a radial direction of the yoke, wherein the base plate includes a coil electrically connected to the sensor, and the sensor is disposed to correspond to the magnet, wherein at least a portion of the coil is disposed between the first edges and the second edges in the radial direction of the yoke. 5.The electric motor of claim 1, further comprising: a connecting member disposed on the rotor; a holder engaged with the connecting member; a mirror engaged with the holder; a bearing housing engaged with the stator; and a first bearing and a second bearing disposed in the bearing housing. ​ ​ wherein the first bearing is disposed between the bearing housing and the yoke, the second bearing is disposed between the shaft and the bearing housing, and the stator is disposed to overlap the mirror in a radial direction, wherein the bearing housing includes a first region in contact with the stator and a second region in contact with the first bearing, and an outer diameter of the first region is larger than an outer diameter of the second region.

6. The electric motor of claim 1, further comprising: a connecting member disposed on the rotor; a holder disposed on the connecting member; a mirror engaged with the holder; a bearing housing engaged with the stator; and a first bearing and a second bearing disposed on the bearing housing, wherein the first bearing is disposed to overlap the mirror in a radial direction, the second bearing is disposed not to overlap the mirror in the radial direction, and an inner diameter of the first bearing is larger than an inner diameter of the second bearing, wherein the bearing housing includes a first region in contact with the stator and a second region in contact with the first bearing, and an outer diameter of the first region is larger than an outer diameter of the second region.

7. The electric motor of claim 1, further comprising: a connecting member disposed on the rotor; a holder disposed on the connecting member; a first mirror and a second mirror engaged with the holder; a bearing housing engaged with the stator; and a first bearing disposed on the bearing housing, wherein the rotor includes a yoke engaged with the shaft and a magnet disposed in the yoke, the yoke includes a magnet receiving portion in which the magnet is disposed and a column portion in contact with the first bearing, and an outer diameter of the magnet receiving portion is larger than an outer diameter of the column portion and is smaller than a shortest distance between the first mirror and the second mirror, wherein the bearing housing includes a first region in contact with the stator and a second region in contact with the first bearing, and an outer diameter of the first region is larger than an outer diameter of the second region.

8. The electric motor of claim 1, further comprising: a connecting member disposed on the rotor; a holder disposed on the connecting member; and a mirror engaged with the holder, wherein the holder includes a first surface in contact with a rear surface of the mirror and a first protrusion disposed to protrude more than the first surface, and the first protrusion is in contact with one of a side surface and a front surface of the mirror, wherein the holder includes a body having the first surface and a bracket engaged with the body, wherein the bracket includes a bracket body in contact with the holder and a clip portion bent from the bracket body to be in contact with the front surface of the mirror, wherein the clip portion is divided into a first region and a second region, ​ ​ The first region is a portion bent perpendicularly from the support body, and the second region is a portion bent from the first region toward the support body. The first region is a portion bent perpendicularly from the support body, and the second region is a portion bent from the first region toward the support body. The first region is a portion bent perpendicularly from the support body, and the second region is a portion bent from the first region toward the support

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