electric machine

Abstract

Embodiments can provide an electric motor including a shaft, a rotor including a rotor core and a coil disposed on the rotor core, a stator disposed outside the rotor, a substrate electrically connected with the coil, and a first housing in which the substrate is disposed, the first housing being engaged with the shaft and the rotor, wherein the substrate includes a sensor and a coil connected with the sensor, the first housing includes a hole, the stator includes a yoke and a magnet disposed in the yoke, the yoke includes a plurality of protrusions, and the protrusions and the hole are disposed to overlap the coil in an axial direction.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric motor. BACKGROUND

[0002] The electric motor can include a rotor, a stator, and a shaft. The shaft is engaged with the rotor. The rotor can be disposed outside the stator. The rotor rotates due to electromagnetic interaction with the stator, and when the rotor rotates, the shaft rotates.

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

[0004] To detect the position of the rotor, the rotor can further include an encoder wheel connected with the rotor, a light source for emitting light to the encoder wheel, and an optical sensor for detecting the light.

[0005] However, since such an electric motor has a complex structure, the electric motor has a problem in that the manufacturing process is complicated and the electric motor is easily affected by external force.

[0006] Therefore, an electric motor that detects the position of a rotor using a sensing magnet magnetized in a multi-pole and a rotary encoder sensor has been proposed. However, such an electric motor has a problem in that the sensing magnet is easily affected by external magnetic force and the mountability is low. SUMMARY

[0007] TECHNICAL PROBLEM

[0008] The present application aims to provide an electric motor that is high in strength in structure, simple in structure, and high in design freedom.

[0009] The object to be solved by the present application is not limited to the above-described object, and other objects not described above will be clearly understood by those skilled in the art through the following description.

[0010] TECHNICAL SOLUTION

[0011] One aspect of the present application provides an electric motor including a shaft, a rotor including a rotor core and a first coil disposed on the rotor core, a stator including a yoke and a magnet disposed on the yoke, a substrate electrically connected with the first coil, and a first housing engaged with the rotor, wherein the rotor is disposed in the stator, the substrate includes a sensor and a second coil connected with the sensor, the first housing includes a hole, the yoke includes a plurality of protrusions, and the protrusions and the hole are disposed to overlap the second coil in an axial direction.

[0012] The electric motor can further include a second housing rotatably supporting each of the shaft and the rotor core, wherein the rotor core can be disposed above the second housing.

[0013] The second housing can include a second body and a bearing housing protruding from the second body, the motor can further include a plurality of bearings disposed in the bearing housing, and a portion of the plurality of bearings can be disposed to radially overlap the first housing.

[0014] The yoke can include a first body having a ring shape, and the protrusion can protrude inward from the first body.

[0015] The yoke can include a first body having a ring shape and a flange extending from the first body, and the second housing can be in contact with the flange.

[0016] The first housing can include a first member engaged with the shaft and the base plate, a second member disposed to be radially spaced apart from the first member outside the yoke, and a plurality of third members connecting the first member and the second member, and the hole can be disposed radially between the first member and the second member.

[0017] The yoke can include a first body having a ring shape and a flange extending from the first body, a first inner diameter of the second member can be greater than an outer diameter of the first body and less than an outer diameter of the flange.

[0018] The yoke can include a first body having a ring shape and a flange extending from the first body, the first member can be disposed to radially overlap the first body, and the second member can be disposed to axially overlap the flange.

[0019] An outer diameter of the base plate can be greater than an outer diameter of the first member and less than a second inner diameter of the second member.

[0020] One surface of the protrusion can include an inner circumferential surface centered on an axial center.

[0021] The protrusion can be disposed to axially overlap the rotor core.

[0022] The second coil can be a pattern coil.

[0023] Another aspect of the present application provides a motor including a stator, a rotor disposed above the stator, and a sensing portion disposed between the stator and the rotor, wherein the rotor includes a first housing and a plurality of protrusions protruding from the first housing, the sensing portion includes a first base plate and a first sensing member disposed on an upper surface of the first base plate, and the plurality of protrusions and the first sensing member overlap in a vertical direction.

[0024] The first sensing member can include a coil, the plurality of protrusions can be disposed to form a ring shape, and the coil can be disposed to have a shape corresponding to the ring shape.

[0025] The first substrate can include a first region in which the first sensing member is disposed and having a ring-shaped band, and a second region protruding inward from the first region and in which the second sensing member is disposed.

[0026] The stator can include a second housing and a stator core, the protrusions of the rotor can protrude from a lower surface of the first housing, and the first substrate can be disposed between the stator core and a bottom surface of the second housing.

[0027] The second housing can include an outer wall and an inner wall, and the stator core can be engaged with the inner wall.

[0028] The inner wall can include a step formed outward, and the stator core can be disposed on the step.

[0029] The first substrate can be disposed between the inner wall and the outer wall.

[0030] The rotor can include a magnet disposed on an inner surface of the first housing and corresponding to the stator core.

[0031] The rotor can include a yoke disposed between the magnet and the inner surface of the first housing.

[0032] The motor can include a shaft engaged with the first housing and the second housing, and the first housing and the second housing can include a first hole and a second hole engaged with the shaft.

[0033] The motor can include a first bearing disposed between the shaft and the first housing, and a second bearing disposed between the shaft and the second housing.

[0034] Still another aspect of the present application provides a motor including a second substrate, a stator disposed on the second substrate, a rotor disposed above the stator, a first substrate disposed between the stator and the rotor, a coil disposed on the first substrate, and a connection member electrically connecting the first substrate and the second substrate, wherein the rotor includes a plurality of protrusions, the coil is disposed corresponding to the plurality of protrusions, and the substrate includes an opening disposed inside the coil.

[0035] The rotor can include a yoke disposed between the magnet and the inner surface of the first housing, and the plurality of protrusions can be formed to extend in a radial direction from a lower end of the yoke.

[0036] The coil can form a circle.

[0037] Still another aspect of the present application provides an electric motor, including a stator including a second housing, a rotor disposed above the stator and including a first housing, and a sensing portion disposed between the first housing and the second housing, wherein the rotor includes a plurality of protrusions protruding from the first housing, the sensing portion includes a first substrate and a first sensing member disposed on the first substrate, and the first sensing member and the plurality of protrusions are disposed to correspond to each other.

[0038] The electric motor can include a cover disposed below the first housing and a driving portion disposed on the cover, the driving portion can include a second substrate and a driving element disposed on the second substrate, and the first substrate and the second substrate can be electrically connected to each other.

[0039] Advantageous Effects

[0040] According to the embodiment, there is an advantage of significantly reducing the number of components for detecting the position of the rotor and simplifying the structure.

[0041] According to the embodiment, since the yoke of the fixed magnet is used to detect the position of the rotor using magnetic induction, there is an advantage of reducing the number of components.

[0042] According to the embodiment, there is an advantage of preventing foreign substances or water from entering the stator.

[0043] According to the embodiment, since a portion of the rotor is used as a component for detecting the position of the rotor, there is an advantage of simplifying the structure and facilitating assembly.

[0044] According to the embodiment, since the protrusion for detecting the position of the rotor is disposed on the rotor, there is an advantage of more accurately detecting the position of the rotor since an error in the position between the sensing portion and the protrusion is significantly reduced.

[0045] According to the embodiment, since the first substrate and the second substrate are disposed in different spaces, there is an advantage of improving resolution when detecting the position of the rotor since the maximum size of the first substrate on which the coil is disposed is secured. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a perspective view illustrating an electric motor according to an embodiment.

[0047] Figure 2 is an exploded perspective view illustrating Figure 1 the electric motor illustrated in FIG. 1.

[0048] Figure 3 is a side sectional view illustrating the electric motor cut along line A-A of Figure 1 FIG. 1.

[0049] Figure 4 is a side sectional view illustrating the electric motor cut along line A-A of Figure 2View of the yoke of the stator shown in Fig.

[0050] Figure 5 View showing the substrate.

[0051] Figure 6 View showing the first housing.

[0052] Figure 7 View showing Figure 1 Plan view of the electric machine shown in Fig.

[0053] Figure 8 Perspective view showing the electric machine according to the embodiment.

[0054] Figure 9 View showing Figure 8 Exploded perspective view of the electric machine shown in Fig.

[0055] Figure 10 View showing Figure 8 Side cross-sectional view of the electric machine shown in Fig.

[0056] Figure 11 Front view showing the first housing.

[0057] Figure 12 Plan view showing the first housing.

[0058] Figure 13 Perspective view showing the first and second substrates.

[0059] Figure 14 Plan view showing the first substrate.

[0060] Figure 15 Plan view showing the drive portion.

[0061] Figure 16 View showing the first and second substrates in the axial direction.

[0062] Figure 17 View showing the first and second substrates made of the same substrate material.

[0063] Figure 18 View showing the position of the outer wall of the second housing and the position of the protrusion of the rotor.

[0064] Figure 19 View showing the rotor including the protrusion according to the variant embodiment.

[0065] Figure 20 View showing the rotor including Figure 19 Side cross-sectional view of the electric machine shown in Fig. DETAILED DESCRIPTION

[0066] A direction parallel to a length direction (a vertical direction) of the shaft is an axial direction, a direction around the shaft perpendicular to the axial direction is a radial direction, and a direction around the shaft along a circle having a radius in the radial direction is a circumferential direction.

[0067] Figure 1 is a perspective view showing a motor according to an embodiment, Figure 2 is a perspective view showing Figure 1 is an exploded perspective view of the motor shown in Figure 3 is a side cross-sectional view of the motor taken along a line A-A of Figure 1 Hereinafter, the term "inward" refers to a direction toward the shaft 100 in the radial direction of the motor, and the term "outward" refers to a direction opposite to the "inward".

[0068] Referring to Figures 1 to 3 , a motor according to an embodiment can include a shaft 100, a rotor 200, a stator 300, a substrate 400, a first housing 500, and a second housing 600.

[0069] The shaft 100 is engaged with the first housing 500. The shaft 100 can be press-fitted to a central portion of the first housing 500. As the shaft 100 rotates, the first housing 500 rotates in linkage with the rotation of the shaft 100. The shaft 100 is rotatably supported by a bearing 700.

[0070] The rotor 200 can include a rotor core 210 and a coil 220. The rotor core 210 can include a plurality of teeth, and the coil 220 is wound around each tooth. The rotor core 210 is engaged with the first housing 500. The rotor core 210 can be fixed to the first housing 500 using a separate engagement member. The rotor core 210 is disposed spaced apart from the second housing 600. Accordingly, as the first housing 500 rotates, the rotor 200 also rotates together with the first housing 500. Meanwhile, an insulator 230 can be disposed between the rotor core 210 and the coil 220.

[0071] The stator 300 is disposed outside the rotor 200. The stator 300 can include a yoke 310 and a magnet 320. The magnet 320 is fixed to the yoke 310.

[0072] The substrate 400 is electrically connected with the coil 220. The substrate 400 can be engaged with one side of the first housing 500. The substrate 400 is fixed to the first housing 500 using a separate engagement member. Accordingly, as the first housing 500 rotates, the substrate 400 also rotates together with the first housing 500. A sensor 410 and a coil 420 can be disposed on the substrate 400. An air gap is formed in the axial direction between the substrate 400 and the yoke 310.

[0073] The first housing 500 is coupled with the shaft 100. The substrate 400 is disposed at one side of the first housing 500. The yoke 310 of the stator 300 is disposed at the other side of the first housing 500. In addition, the first housing 500 is coupled with the rotor core 210.

[0074] The second housing 600 is disposed at one side of the stator 300. Accordingly, the stator 300 and the rotor 200 are disposed in the axial direction between the second housing 600 and the first housing 500. The second housing 600 can include a second body 610 and a bearing housing 620. The yoke 310 of the stator 300 is fixed to the second body 610. The bearing housing 620 protrudes from the second body 610. The bearing housing 620 can be a hollow member having a hollow interior. The bearing 700 is disposed in the bearing housing 620. The shaft 100 is disposed to pass through the bearing housing 620.

[0075] Figure 4 is a view illustrating Figure 2 the yoke 310 of the stator 300 shown in FIG.

[0076] Referring to Figure 3 and Figure 4 , the yoke 310 of the stator 300 is formed of a metal material, and is a member for fixing the magnets 320 and generating an induced electromotive force through interaction with the coils 220 disposed on the substrate 400. In the motor according to the embodiment, in order to detect the position of the rotor 200, the position of the rotor 200 is detected by magnetic induction using a portion of the yoke 310 fixing the magnets 320 without using a separate sensing magnet. The portion of the yoke 310 has a shape that induces an induced electromotive force to be interrupted according to rotation of the rotor 200.

[0077] For example, the yoke 310 can include a first body 311, a plurality of protrusions 312, and a flange 313. The first body 311 is a ring-shaped member. The flange 313 can be disposed to extend outward from one side of the first body 311. The plurality of protrusions 312 can be disposed to extend outward from the other side of the first body 311.

[0078] The magnets 320 can be fixed to the inner circumferential surface of the first body 311. The magnets 320 can be one ring-shaped magnet 320 or can be formed by combining a plurality of unit magnets 320.

[0079] The flange 313 is fixed and in contact with one surface of the second body 610 of the second housing 600.

[0080] The plurality of protrusions 312 can be disposed at predetermined intervals in a circumferential direction of the yoke 310. The protrusions 312 can be flat plate members. Inner side edges 312a of the protrusions 312 can have curved surfaces. The protrusions 312 can be disposed to overlap the magnets 320 and a portion of the rotor core 210 in an axial direction. Also, the protrusions 312 can be disposed to overlap a portion of the substrate 400 in the axial direction and to face a portion of the coil 420 disposed on the substrate 400.

[0081] The number of the protrusions 312 can be variously adjusted to correspond to a resolution of the sensor 410. The protrusions 312 interact with the coil 420 of the substrate 400 to generate an induced electromotive force. Due to gaps between the protrusions 312, a deviation in the induced electromotive force is discontinuously generated, and the sensor 410 detects the deviation to identify one rotation of the rotor 200.

[0082] Figure 5 FIG. 4 is a view illustrating the substrate 400.

[0083] Referring to Figure 3 and Figure 5 , the sensor 410 and the coil 420 are disposed on the substrate 400. The sensor 410 is electrically connected with the coil 420 and measures a change in an induced electromotive force according to rotation of the substrate 400. At least a portion of the coil 420 can be a pattern coil. The coil 420 can be a coil in which a first coil 421 and a second coil 422 having different shapes and sizes are combined. For example, the first coil 421 has a radial shape, and the second coil 422 can have a ring shape.

[0084] The substrate 400 can have a circular flat plate shape, and the coil 420 can be disposed symmetrically with respect to a center of the substrate 400. For example, the coil 420 can be disposed rotationally symmetrically with respect to the center of the substrate 400. Meanwhile, a plurality of holes 430 can be disposed in the substrate 400. Separate coupling members pass through the holes 430 to couple the substrate 400 and the first housing 500.

[0085] Figure 6 FIG. 5 is a view illustrating the first housing 500.

[0086] Referring to Figure 3 and Figure 6 , the first housing 500 rotates together with the substrate 400 when the shaft 100 rotates. Due to the first housing 500, a spaced distance between the substrate 400 and the yoke 310 is secured in the axial direction. Also, the first housing 500 covers an outer side of the yoke 310 to block foreign substances from entering the stator 300.

[0087] The first housing 500 can include a first member 510, a second member 520, and a third member 530.

[0088] The first member 510 can be a disc member. The substrate 400 is engaged with the first member 510. A hole 511 through which the engaging member passes can be provided in the first member 510 to be engaged with the substrate 400. A hole 512 into which the shaft is press-fitted can be provided in a central portion of the first member 510.

[0089] The second member 520 can be a ring-shaped member. The second member 520 is disposed spaced apart from the first member 510. Also, the second member 520 is disposed outside the yoke 310. The second member 520 can be disposed to overlap the first body 311 of the yoke 310 in the radial direction. Also, the second member 520 can be disposed to overlap the flange 313 of the yoke 310 in the axial direction.

[0090] The first inner diameter D2 of the second member 520 is greater than the outer diameter D1 of the first body 311 of the yoke 310 and is less than the outer diameter D3 of the flange 313. In the inner circumferential surface of the second member 520, the first inner diameter D2 of the second member 520 is the inner diameter of the inner circumferential surface of the second member 520 disposed to overlap the yoke 310 in the radial direction.

[0091] Since the second member 520 covers the outside of the yoke 310 in the radial and axial directions, it is possible to prevent foreign matter or water from entering the stator 300.

[0092] The third member 530 is a member connecting the first member 510 and the second member 520. A plurality of third members 530 can be provided. The partition space between the first member 510 and the second member 520 and the edge of the third member 530 form a hole 540. The protrusion 312 of the yoke 310 and a portion of the coil 420 of the substrate 400 are disposed to face through the hole 540. A plurality of holes 540 can be provided. The plurality of holes 540 can be disposed in the circumferential direction of the first housing 500. The number of holes 540 can correspond to the number of protrusions 312 of the yoke 310.

[0093] Figure 7 is a plan view showing Figure 1 the motor shown in FIG.

[0094] Referring to Figure 3 and Figure 7 , the size of each hole 540 can be greater than the size of each protrusion 312 of the yoke 310. For example, when the motor is viewed in the axial direction in a state in which the protrusion 312 and the hole 540 are aligned, the inner edge 312a of the protrusion 312 can be disposed more outward than the inner edge 541 of the hole 540, a gap can be formed in the radial direction between the protrusion 312 and the first member 510, and a gap can also be formed between the protrusion 312 and the third member 530. The inner edge 312a of the protrusion 312 can be an inner circumferential surface surrounding the shaft center.

[0095] When the motor is viewed in the axial direction, the base plate 400 is disposed so that the outer edge portion overlaps the protrusions 312. The outer diameter D4 of the base plate 400 is set to be greater than the outer diameter D5 of the first member 510 and less than the second inner diameter D6 of the second member 520. In the inner circumferential surface 542 of the second member 520, the second inner diameter D6 of the second member 520 is the inner diameter of the inner circumferential surface 542 of the second member 520 that is disposed not to overlap the yoke 310 in the radial direction.

[0096] Meanwhile, the width W1 of the protrusions 312 in the circumferential direction can be set to be greater than the interval distance W2 in the circumferential direction between the protrusions 312.

[0097] The shaft 100 rotates due to the electro-magnetic interaction between the coil 220 and the magnet 320. When the shaft 100 rotates, the first housing 500 and the base plate 400 rotate together. Accordingly, when the coil 420 disposed on the base plate 400 rotates, an induced magnetic force is generated between the coil 420 and the protrusions 312 of the yoke 310, and the sensor 410 detects a change in the induced magnetic force. As described above, since the protrusions 312 that are a part of the yoke 310 and the coil 420 disposed on the base plate 400 are used to detect the position of the rotor 200, the structure of the motor can be greatly simplified.

[0098] Figure 8 FIG. 1 is a perspective view illustrating a motor according to an embodiment, Figure 9 FIG. 2 is an exploded perspective view illustrating Figure 8 the motor illustrated in FIG. 1, and Figure 10 FIG. 3 is a side cross-sectional view illustrating Figure 8 the motor illustrated in FIG. 1. Hereinafter, the term "inward" refers to a direction toward the shaft 1100 in the radial direction of the motor, and the term "outward" refers to a direction opposite to the "inward".

[0099] Referring to Figures 8 to 10 FIG. 1, a motor according to an embodiment can include a shaft 1100, a rotor 1200, a stator 1300, a sensing portion 1400, a second base plate 1510, a connecting member 1600, a driving portion 1500, a bearing 1800, and a cover 1900.

[0100] The shaft 1100 is engaged with the second housing 1310. The shaft 1100 can be press-fitted to a central portion of the second housing 1310.

[0101] The rotor 1200 rotates around the shaft 1100. The rotor 1200 can include a first housing 1210, a protrusion 1220, and a yoke 1240. A first bearing 1810 is fixed to a central portion of the first housing 1210. The protrusion 1220 can be disposed on a lower surface 1211 of the first housing 1210. The yoke 1240 is a metal member and can be disposed on an inner surface of a side wall of the first housing 1210. The yoke 1240 is disposed between the inner surface of the first housing 1210 and a magnet 1230. The magnet 1230 can be fixed to an inner side of the yoke 1240. The magnet 1230 can be one annular magnet 1230 or can be formed by combining a plurality of unit magnets 1230. Meanwhile, a first hole 1212 through which the shaft 1100 passes can be formed in the central portion of the first housing 1210.

[0102] The stator 1300 can include a second housing 1310, a stator core 1320, and an insulator 1330.

[0103] A second bearing 1800 can be disposed in a central portion of the second housing 1310. The second bearing 1800 supports the shaft 1100. In addition, the second housing 1310 can include an inner wall 1312 and an outer wall 1313. The inner wall 1312 is disposed closer to the central portion of the second housing 1310 than the outer wall 1313 in a radial direction. The inner wall 1312 and the outer wall 1313 are portions protruding in an axial direction of the shaft 1100 from a bottom surface 1311 of the second housing 1310. Both the inner wall 1312 and the outer wall 1313 can be annular members including inner and outer circumferential surfaces, respectively. The inner wall 1312 can be disposed to be spaced apart from the second bearing 1800 in a radial direction.

[0104] The stator core 1320 is engaged with the inner wall 1312 of the second housing 1310. For example, the stator core 1320 can be engaged with the second housing 1310 such that an inner circumferential surface of the stator core 1320 is in contact with an outer circumferential surface of the inner wall 1312. In addition, the inner wall 1312 of the second housing 1310 can include a step 1312a, and the stator core 1320 can be disposed on the step 1312a. Meanwhile, a second hole 1314 through which the shaft 1100 passes can be disposed in the central portion of the second housing 1310.

[0105] The sensing part 1400 detects a position of the rotor 1200. The sensing part 1400 can include a first substrate 1410 and a first sensing member 1420.

[0106] The first substrate 1410 can be disposed above the second housing 1310. In addition, the first substrate 1410 is disposed above the bottom surface 1311 of the second housing 1310. The first substrate 1410 can be disposed between the inner wall 1312 and the outer wall 1313 of the second housing 1310.

[0107] The first substrate 1410 can be disposed under the protrusion 1220 of the second housing 1310. The first substrate 1410 and the protrusion 1220 of the second housing 1310 are disposed to face each other in the axial direction of the shaft 1100. The first substrate 1410 is a ring-shaped member and can include an opening 1401.

[0108] The first sensing member 1420 can be disposed on the first substrate 1410. The first sensing member 1420 can be a coil. The first sensing member 1420 can interact with the protrusion 1220 of the second housing 1310 to generate an induced electromotive force. The first sensing member 1420 can have a shape in which a predetermined pattern is repeated. The overall shape of the first sensing member 1420 can be a circular shape.

[0109] The driving part 1500 can be located under the second housing 1310. The driving part 1500 can include a second substrate 1510 and a driving element 1520 disposed on the second substrate 1510.

[0110] The connecting member 1600 electrically connects the first substrate 1410 and the second substrate 1510. The connecting member 1600 can be a connector or a connecting pin disposed to pass through the second housing 1310.

[0111] The bearing 1800 can include a first bearing 1810 and a second bearing 1820. The first bearing 1810 is fixed to the first housing 1210 and supports the shaft 1100. The second bearing 1820 is fixed to the second housing 1310 and supports the shaft 1100.

[0112] The cover 1900 is engaged with the second housing 1310 to cover a space of the second housing 1310 in which the second substrate 1510 is disposed.

[0113] Figure 11 FIG. 1 is a perspective view illustrating a first housing 1210, Figure 12 FIG. 2 is a plan view illustrating the first housing 1210.

[0114] Referring to Figure 11 and Figure 12 The first housing 1210 can include a plurality of protrusions 1220. The protrusions 1220 can protrude from a lower surface 1211 of the first housing 1210. The protrusions 1220 interact with the first sensing member 1420 disposed on the first substrate 1410 to generate an induced electromotive force when the first housing 1210 rotates. The plurality of protrusions 1220 can be disposed at a predetermined interval in a circumferential direction based on a center of the first housing 1210. A portion of a side surface of each protrusion 1220 can have a curved surface. In addition, other portions of the side surface of the protrusion 1220 can be disposed such that an extension surface can be disposed to pass through the center C1 of the first housing 1210.

[0115] Since the protrusion 1220 is formed to protrude with a portion of the first housing 1210, a separate component for detecting the position of the rotor 1200 is not required, thus having an advantage of a simple structure.

[0116] The first hole 1212 through which the shaft 1100 passes can be provided at a central portion of the first housing 1210.

[0117] Figure 13 is a perspective view showing the first substrate 1410 and the second substrate 1510, and Figure 14 is a plan view showing the first substrate 1410.

[0118] Referring to Figure 13 and Figure 14 , the first substrate 1410 is a ring-shaped member including an inner circumferential surface. The first substrate 1410 is a substrate for detecting the position of the rotor 1200. The first substrate 1410 can be divided into a first region 1411 and a second region 1412. The first region 1411 is a region in which the first sensing member 1420 is provided and the first region 1411 can have a ring-shaped band shape. The second region 1412 is a region in which the second sensing member 1416 is provided and the second region 1412 protrudes inward from the inner circumferential surface of the first region 1411.

[0119] The second sensing member 1416 is also a member for detecting the position of the rotor 1200, can be a Hall integrated circuit (IC) for detecting a change in magnetic force detected by the magnet 1230. Further, the second region 1412 can include an inductive encoder 1413 connected to the first sensing member 1420 and detecting an induced electromotive force. Further, a first pin hole 1414 connected to the connection member 1600 can be provided in the second region 1412. Further, a plurality of engagement portions 1415 for engagement with the second housing 1310 can be provided on the second substrate 1510. The engagement portions 1415 can be provided to protrude from the inner circumferential surface of the first region 1411.

[0120] The first sensing member 1420 is a member having a coil with a predetermined pattern provided along the first region 1411 and provided to face the protrusion 1220. Accordingly, the first sensing member 1420 is provided along a path in which the protrusion 1220 rotates around the shaft center.

[0121] Figure 15 is a plan view showing the driving portion 1500.

[0122] Referring to Figure 15The driving part 1500 includes a second substrate 1510 and a driving element 1520. The second substrate 1510 is a circular member. The driving element 1520 is disposed on the second substrate 1510 and controls the motor to be driven. A second pin hole 1512 connected with the connecting member 1600 can be disposed in the second substrate 1510. A groove 1511 can be disposed in the second substrate 1510. The groove 1511 is formed to be concave inward from the edge of the second substrate 1510. The shape of the groove 1511 corresponds to the shape of the second area 1412 of the first substrate 1410.

[0123] Figure 16 FIG. 14 is a view showing the first substrate 1410 and the second substrate 1510 in an axial direction.

[0124] Referring to Figure 10 and Figure 16 The first substrate 1410 is disposed outside the second substrate 1510 when viewed in an axial direction. The first substrate 1410 has a larger size in a radial direction than the second substrate 1510. Accordingly, the radius of the first sensing member 1420 disposed on the first substrate 1410 is increased. Further, since the radius of the first sensing member 1420 is increased, the resolution for detecting the position of the rotor 1200 is increased, and thus the position of the rotor 1200 can be more accurately detected.

[0125] The installation spaces of the first substrate 1410 and the second substrate 1510 are divided in an axial direction. The first substrate 1410 is disposed above the second housing 1310, and the second substrate 1510 is disposed below the second housing 1310. Further, the second substrate 1510 is disposed in a sealed space which is a waterproof and dustproof space and is formed by joining the second housing 1310 and the cover 1900. Since the driving element 1520 of the motor is disposed on the second substrate 1510, the second substrate 1510 is distinguished from the first substrate 1410 and disposed in a separate space, which is advantageous in stability. That is, the first substrate 1410 requiring a large radius to improve the resolution is disposed above the second housing 1310 to secure an installation space, and the second substrate 1510 requiring waterproofing and dustproofing regardless of the resolution is disposed below the second housing 1310 to secure stability.

[0126] A portion of the second region 1412 of the first substrate 1410 can be disposed to overlap the second substrate 1510 in the axial direction. This is to electrically connect the first substrate 1410 and the second substrate 1510, and to arrange a connection position of the connection member 1600 to the first substrate 1410 and the second substrate 1510. For example, a portion 103 of the second region 1412 of the first substrate 1410 can be disposed to overlap the second substrate 1510 in the axial direction so that the first pin hole 1414 of the first substrate 1410 is aligned with the second pin hole 1512 of the second substrate 1510.

[0127] Figure 17 FIG. 13 is a view illustrating the first substrate 1410 and the second substrate 1510 manufactured from the same substrate material.

[0128] Referring to Figure 17 , the first substrate 1410 and the second substrate 1510 are manufactured from the same substrate material. Accordingly, when the first substrate 1410 and the second substrate 1510 are disposed on the same axis C2, the second substrate 1510 is disposed inside the first substrate 1410, and the second region 1412 of the first substrate 1410 corresponds to the groove 1511 of the second substrate 1510. Further, a gap G is formed between the first substrate 1410 and the second substrate 1510. The first substrate 1410 and the second substrate 1510 have the advantage of maximizing the use of a quadrangular substrate material.

[0129] Figure 18 FIG. 14 is a view illustrating a position of the outer wall 1313 of the second housing 1310 and the protrusion 1220 of the rotor 1200.

[0130] Referring to Figure 14 and Figure 18 , the protrusion 1220 is disposed to overlap the first sensing member 1420 of the first substrate 1410 in the vertical direction (axial direction) to form an overlapping region O1. Meanwhile, the outer wall 1313 of the second housing 1310 can be disposed to overlap the protrusion 1220 of the rotor 1200 in the radial direction to form an overlapping region. The outer wall 1313 of the second housing 1310 has the effect of preventing foreign matter or water from entering into the rotor 1200.

[0131] Figure 19 FIG. 15 is a view illustrating a rotor 1200 including a protrusion according to a modified embodiment, Figure 20 FIG. 16 is a side cross-sectional view illustrating a motor including Figure 19 the rotor 1200 shown in FIG. 15.

[0132] Referring to Figure 19The protrusions 1220 can be provided on the yoke 1240. For example, the protrusions 1220 can be provided to extend radially outward from a lower end portion of the yoke 1240. A plurality of protrusions 1220 can be provided radially based on the center of the yoke 1240. The plurality of protrusions 1220 can be provided at predetermined intervals in a circumferential direction of the yoke 1240. That is, a portion of the yoke 1240 is used as the protrusion 1220, and the protrusion 1220 is provided on a lower surface of the first housing 1210 and faces the first substrate 1410 in the axial direction. The protrusion 1220 interacts with the first sensing member 1420

[0133] to generate an induced electromotive force.

[0134] The above-described embodiments can be applied to various devices such as a vehicle or a home appliance.

Claims

1. An electric motor, comprising: axis; A rotor, the rotor comprising a rotor core and a first coil disposed on the rotor core; A stator, the stator comprising a yoke and a magnet disposed on the yoke; A substrate, which is electrically connected to the first coil; as well as A first housing, which engages with the rotor. The rotor is disposed in the stator. The substrate includes a sensor and a second coil connected to the sensor. The first housing includes a hole. The yoke includes multiple protrusions, and The protrusion and the hole are configured to overlap with the second coil in the axial direction.

2. The motor of claim 1, further comprising a second housing rotatably supporting each of the shaft and the rotor core. in, The rotor core is positioned above the second housing.

3. The motor according to claim 2, wherein, The second housing includes a second body and a bearing housing protruding from the second body. The motor further includes a plurality of bearings disposed in the bearing housing, and A portion of the bearings are configured to overlap the first housing in the radial direction.

4. The motor according to claim 1, wherein, The yoke includes a first body having a ring shape, and The protrusion extends inward from the first body.

5. The motor according to claim 2, wherein, The yoke includes a first body having an annular shape and a flange extending from the first body, and The second housing contacts the flange.

6. An electric motor, comprising: Second substrate; Stator, the stator being disposed on the second substrate; A rotor, which is disposed above the stator; A first substrate is disposed between the stator and the rotor; A coil, wherein the coil is disposed on the first substrate; as well as A connecting member electrically connects the first substrate and the second substrate. The rotor includes a first housing and a plurality of protrusions extending from the first housing. The plurality of protrusions and the coil overlap in the vertical direction. The substrate includes an opening disposed inside the coil. The stator includes a second housing and a stator core, and the protrusion of the rotor protrudes from the lower surface of the first housing. The first substrate is disposed between the stator core and the bottom surface of the second housing. The second substrate is disposed in a sealed space formed by the combination of the second housing and the cover.

7. The motor according to claim 6, wherein, The plurality of protrusions are configured to form a ring, and The coil is configured to have a shape corresponding to the ring.

8. The motor according to claim 6, wherein, The first substrate includes: A first region, a first sensing member disposed in the first region, and the first region having the shape of an annular band; and A second region protrudes inward from the first region, and a second sensing element is disposed in the second region.

9. The motor according to claim 6, wherein, The second housing includes an outer wall and an inner wall, and the stator core is engaged with the inner wall.

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