Electronic resolver mounted on in-wheel motor having hollow structure

Abstract

The present invention provides an electronic resolver embedded in an in-wheel motor including a first rotor housing and a motor housing part. The resolver comprises: a hollow circular resolver housing; a rotor which is formed along the inner circumferential surface of the resolver housing and receives an electrical signal, thereby generating an eddy current; and a stator which transmits the electrical signal to the rotor. The stator is integrally mounted in a first stator housing of the motor housing part, the first stator housing being inserted into and coupled to the resolver housing.

Description

Electronic resolver mounted on a hollow-structure in-wheel motor

[0001] The present invention relates to an electronic resolver mounted on an in-wheel motor having a hollow structure, and more specifically, to an electronic resolver mounted on an in-wheel motor comprising a first rotor housing and a motor housing portion, comprising a hollow circular resolver housing, a rotor that receives an electrical signal and generates an eddy current, and a stator that transmits an electrical signal to the rotor.

[0002] In-wheel motors are a critical component of electric-powered vehicles and are primarily applied to electric vehicles, electric motorcycles, and other eco-friendly modes of transportation. By directly transmitting driving force to the wheels, in-wheel motors are characterized by their ability to shorten the power transmission path and maximize efficiency. Conventional internal combustion engine-based vehicles and traditional electric vehicles were designed to transmit driving force through power transmission systems, but this resulted in complex structures and a high likelihood of power loss.

[0003] With the advancement of in-wheel motor systems, the importance of position sensing sensors for precisely measuring wheel rotation positions and controlling driving force is being increasingly emphasized. One such sensor, the electronic resolver, is a device capable of detecting accurate rotation positions even in high-speed rotation environments, playing an essential role in enhancing the efficiency and stability of in-wheel motor systems.

[0004] Conventional electronic resolvers were typically installed separately outside the motor or designed to be isolated from it. This structure resulted in a long signal transmission path between the motor and the resolver, increasing the potential for electromagnetic interference (EMI) and leading to structural complexity and higher assembly costs. In particular, conventional methods exhibited disadvantages such as poor installation and operational efficiency in confined spaces, like those found in in-wheel motors.

[0005] To address the issues of complex structure and assembly process costs, prior art 1 regarding a slotless resolver was presented. However, prior art 1 has limitations in that it is not integrated with an in-wheel motor or placed inside the motor, resulting in low space utilization.

[0006] Accordingly, there is a need for an electronic resolver that can improve usability in limited spaces, simplify the assembly process through a body-shaped structure, and reduce maintenance costs.

[0007] [Prior Art Literature]

[0008] [Patent Literature]

[0009] (Patent Document 1) Prior Art 1: Korean Published Patent Application No. 10-2013-0092059 "Slotless Resolver" (Published August 20, 2013)

[0010] To solve the aforementioned technical problem, the present invention aims to provide an electronic resolver embedded in an in-wheel motor comprising a first rotor housing and a motor housing portion, and comprising a resolver housing, a rotor, and a stator.

[0011] The technical problems that the present invention aims to solve are not limited to the technical problems described above, and other technical problems of the present invention may be derived from the following description.

[0012] To solve the aforementioned technical problem, one embodiment of the present invention provides an electronic resolver embedded in an in-wheel motor comprising a first rotor housing and a motor housing portion. The resolver comprises a hollow circular resolver housing, a rotor formed along the inner circumference of the resolver housing that receives an electrical signal and generates an eddy current, and a stator that transmits an electrical signal to the rotor, wherein the stator is integrally mounted in the first stator housing of the motor housing portion which is inserted into and coupled to the inside of the resolver housing.

[0013] According to the means for solving the problem of the present invention described above, by integrally combining an electronic resolver with an in-wheel motor, the efficiency of the system configuration can be maximized in a limited space.

[0014] In addition, according to the means for solving the problem of the present invention described above, the signal transmission path between the motor and the resolver is shortened, thereby minimizing signal distortion caused by electromagnetic interference.

[0015] In addition, according to the means for solving the problem of the present invention described above, the assembly process can be simplified and the time and cost required for maintenance can be reduced.

[0016] In addition, according to the means for solving the problem of the present invention described above, structural strength and durability are enhanced through an integrated design between the resolver and the motor.

[0017] In addition, according to the means for solving the problem of the present invention described above, the detection accuracy of rotational position and speed can be increased through an integrated design with the in-wheel motor, thereby optimizing the drive control performance of the in-wheel motor.

[0018] In addition, according to the means for solving the problem of the present invention described above, the energy efficiency of the entire system can be improved by reducing losses in the power transmission process through an integrated design with an in-wheel motor.

[0019] The effects of the present invention are not limited to the effects described above, but include all effects understood from the following description.

[0020] Figure 1 is a drawing illustrating an in-wheel motor and an electronic resolver mounted on the in-wheel motor.

[0021] FIG. 2 is a diagram illustrating the configuration of an electronic resolver according to one embodiment of the present invention.

[0022] Figure 3 is a front view and a perspective view of the rotor shown in Figure 2.

[0023] Figure 4 is an enlarged view of the rotor illustrated in Figure 3 to show the outer and inner uneven surfaces of the rotor.

[0024] Figure 5 is a drawing illustrating the application of the in-wheel motor shown in Figure 1 to a means of transportation.

[0025] Fig. 6 is an exploded perspective view of the in-wheel motor shown in Fig. 1.

[0026] FIGS. 7 to 16 are drawings of each component illustrated to explain in detail each component of the in-wheel motor shown in FIGS. 1 to 6.

[0027] Figure 17 is an enlarged view showing the state in which a bearing is mounted on an in-wheel motor.

[0028] Fig. 18 is a cross-sectional view of the in-wheel motor shown in Fig. 1.

[0029] FIG. 19 is a cross-sectional view along line B-B' of the in-wheel motor shown in FIG. 18.

[0030] FIG. 20 is a cross-sectional view along the C-C' line of the in-wheel motor shown in FIG. 18.

[0031] The present invention will be described in detail below with reference to the attached drawings. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments invented in this specification, and the technical concept invented in this specification is not limited by the attached drawings. All terms used herein, including technical and scientific terms, should be interpreted in the sense generally understood by those skilled in the art to which the present invention pertains. Terms defined in advance should be interpreted as having additional meanings consistent with relevant technical literature and the currently invented content, and unless otherwise defined, should not be interpreted in a highly ideal or restrictive sense.

[0032] In order to clearly explain the invention in the drawings, parts unrelated to the explanation have been omitted, and the size, form, and shape of each component shown in the drawings may be varied. Throughout the specification, identical or similar parts are denoted by identical or similar reference numerals.

[0033] In the following description, suffixes such as "part," "module," and "function" regarding components are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles. Furthermore, in describing the embodiments invented in this specification, detailed descriptions of related prior art have been omitted where it is determined that such detailed descriptions could obscure the essence of the embodiments invented in this specification.

[0034] Throughout the specification, when it is stated that a part is "connected (connected, contacted, or coupled)" to another part, this includes not only cases where they are "directly connected (connected, contacted, or coupled)," but also cases where they are "indirectly connected (connected, contacted, or coupled)" with other members interposed therebetween. Furthermore, when it is stated that a part "includes (provides, or provides)" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for additional "included (provided, or provided)" of other components.

[0035] Terms indicating ordinal numbers, such as "first," "second," etc., used herein are used solely for the purpose of distinguishing one component from another and do not limit the order or relationship of the components. For example, the first component of the present invention may be named the second component, and similarly, the second component may be named the first component. Singular forms used herein should be interpreted to include plural forms unless explicitly to the contrary.

[0036] FIG. 1 is a drawing illustrating an in-wheel motor and an electronic resolver mounted on the in-wheel motor.

[0037] Referring to FIG. 1, the electronic resolver (200) can be mounted on an in-wheel motor (A). The detailed coupling relationship between the electronic resolver (200) and the in-wheel motor (A) will be explained below with reference to FIG. 18 to FIG. 20.

[0038] The in-wheel motor (A) may include a first rotor housing (10), a second rotor housing (20), a first rotor cover (30), a second rotor cover (30'), a first stator housing (110), a coupling piece (130), a fixing piece (140), and an electronic resolver (200). A detailed description of each component of the in-wheel motor (A) will be provided below with reference to FIGS. 7 to 16.

[0039] FIG. 2 is a diagram illustrating the configuration of an electronic resolver according to one embodiment of the present invention.

[0040] Referring to FIG. 2, an electronic resolver (200) includes a resolver housing (240), a rotor (210), and a stator (220). The resolver housing (240) may be a hollow circular shape. The rotor (210) may be named a resolver blade, a resolver target, and a resolver target surface. The stator (220) may be named a resolver PCB and a resolver pattern. The resolver housing (240) may be the rotor (210) or configured to include the rotor.

[0041] The rotor (210) receives an electrical signal from the stator (220) and generates an eddy current. The stator (220) may be formed from a PCB board and transmits the electrical signal to the rotor (210). More specifically, an electrical signal (Excitation) is generated from the PCB of the stator (220), and the stator transmits the electrical signal to the rotor (210). The rotor (210) receives the electrical signal and generates an eddy current on the surface of the rotor (210), and the stator (220) measures the eddy current to detect a sine signal and a cosine signal. Subsequently, the stator (220) detects the phase angle (θ) of the electrical signal from the sine signal and the cosine signal. The stator (220) can measure the speed and position of the in-wheel motor (A) according to the distance the electrical signal is transmitted to the rotor (210), and this process will be explained below with reference to FIG. 4.

[0042] The stator (220) may be spaced apart from the rotor (210) and face each other. The stator (220) may be formed from a PCB board. The stator (220) may be integrally mounted in the first stator housing (110) of the motor housing part (100) which is inserted into and coupled to the inside of the resolver housing (240).

[0043] Figure 3 is a front view and a perspective view of the rotor shown in Figure 2.

[0044] Referring to FIG. 3, the rotor (210) may include an outer uneven surface (211), an inner uneven surface (212), a first rotor housing coupling tab (not shown), a rim coupling hole (not shown), and a rotor cover coupling hole (not shown). A fixing jaw (230) for fixing a bearing (300) may be disposed on the inner circumference of the rotor (210). The rotor (210) may be made of an aluminum alloy of A6061-T6 material. The outer uneven surface (211) may be named a resolver protrusion surface, and the inner uneven surface (212) may be named a resolver reference surface. The length of the outer uneven surface (211) and the inner uneven surface (212) may be formed to be 8 mm.

[0045] Figure 4 is an enlarged view of the rotor illustrated in Figure 3 to show the outer and inner uneven surfaces of the rotor.

[0046] Referring to FIGS. 3 and 4, the rotor (210) may include an outer uneven surface (211) formed to protrude radially on the inner circumference of the rotor (210) and an inner uneven surface (212) formed on the inner circumference of the rotor (210) between the outer uneven surface (211). The outer uneven surface (211) may be spaced 1.5 mm apart from one side of the stator (220). The inner uneven surface (212) is formed between the outer uneven surfaces (211) and integrated with the rotor (210), and may be spaced 9.5 mm apart from one side of the stator (220). Accordingly, when an electrical signal is transmitted from the stator (220) to the rotor (210) during the rotation of the in-wheel motor (A), the distance between the stator (220) and the outer uneven surface (211) and the distance between the stator (220) and the inner uneven surface (212) are different, so the stator (220) can measure the rotational speed and position of the in-wheel motor (A) according to the distance at which the electrical signal is transmitted.

[0047] Figure 5 is a drawing illustrating the application of the in-wheel motor shown in Figure 1 to a means of transportation.

[0048] Referring to FIG. 5, the in-wheel motor (A) may include a motor housing part (100) that is formed with a hollow interior and fixed to the front and rear frame (2) of the means of transport (1).

[0049] Fig. 6 is an exploded perspective view of the in-wheel motor shown in Fig. 1.

[0050] Referring to FIGS. 5 and 6, the in-wheel motor (A) may further include a dust cover (50), a motor rotor (60), a motor stator (70), and a bearing (300). The motor housing portion (100) may include a first stator housing (110), a second stator housing (120), a coupling piece (130), a fixing piece (140), and a fixing groove (150).

[0051] Referring to FIGS. 5 and 6, a fixing piece (140) included in the in-wheel motor (A) is formed protruding from the inner surface of the first stator housing (110) and the second stator housing (120) and is intended to fix the first stator housing (110) and the second stator housing (120) to the frame (2) of the means of transport (1). A bolt hole (not shown) is formed in the fixing piece (140) so that a bolt and a nut can be fixed. The outer surface of the fixing piece (140) may be formed in alignment with the outer surface of the first stator housing (110) and the second stator housing (120). Accordingly, the frame (2) of the means of transport (1) can be fixed to the fixing piece (140) from the outside of the in-wheel motor (A).

[0052] That is, since the frame (2) of the means of transport (1) is fixed to the outer surface of the motor housing (100) rather than penetrating the inside of the motor housing (100), the structure of the motor can be simplified while maintaining the hollow portion of the motor housing (100), and the weight can be reduced.

[0053] FIGS. 7 to 16 are drawings of each component illustrated to explain in detail the components of the in-wheel motor shown in FIGS. 1 to 6.

[0054] Below, with reference to FIGS. 7 to FIGS. 16, a detailed description of each component included in the in-wheel motor (A) will be provided.

[0055] FIG. 7 is a front view, a right side view, and a perspective view of the first rotor housing.

[0056] Referring to FIG. 7, the first rotor housing (10) may include a nut groove (11), a bearing attachment surface (12), a core coupling surface (13), and a key groove (14).

[0057] A nut groove (11) is formed to connect the second rotor housing (20), a brake (not shown), and a rim (not shown) to the first rotor housing (10), and may be positioned on both sides of the outer circumference of the first rotor housing (10). A bearing attachment surface (12) is formed to attach a bearing (300) and may be positioned on the inner rear circumference of the first rotor housing (10). A core coupling surface (13) is a surface on which the motor rotor (60) is placed and may be formed on the inner circumference of the first rotor housing (10). A key groove (14) is formed to restrain the core rotation of the motor rotor (60), and four key grooves (14) are positioned on the inner circumference of the first rotor housing (10). The first rotor housing (10) may be made of an aluminum alloy of A6061-T6 material.

[0058] FIG. 8 is a front view, a right side view, and a perspective view of the second rotor housing.

[0059] Referring to FIG. 8, the second rotor housing (20) may include a coupling hole (not shown), a rotor cover counterbore (not shown), and a bearing attachment surface (21).

[0060] A coupling hole (not shown) may be formed to connect the first rotor housing (10) and the brake (not shown). A bearing attachment surface (21) is formed to attach a bearing (300) and may be positioned on the inner rear perimeter of the second rotor housing (20). The second rotor housing (20) may be made of an aluminum alloy of A6061-T6 material.

[0061] FIG. 9 is a front view and a perspective view of the first rotor cover. FIG. 10 is a front view and a perspective view of the second rotor cover.

[0062] Referring to FIGS. 9 and FIGS. 10, the first rotor cover (30) may include a seal plate attachment surface (32). The second rotor cover (30') may include a bearing attachment surface (31) and a seal plate attachment surface (32).

[0063] A bearing attachment surface (31) is formed to attach a bearing (300) and may be positioned on the inner rear circumference of the second rotor cover (30'). A seal plate attachment surface (32) is formed to attach a seal plate and may be formed on the inner circumference of the first rotor cover and the second rotor cover (30'). The first rotor cover (30) may be coupled to the resolver housing (240). The second rotor cover (30') may be coupled to the second rotor housing (20). The first rotor cover (30) and the second rotor cover (30') may be made of an aluminum alloy of A6061-T6 material.

[0064] Figure 11 is a drawing illustrating an oil seal.

[0065] The oil seal (40) can be manufactured in a circular ring shape and can be designed as an externally rotating structure that can be mounted on the first stator housing (110) and the second stator housing (120), which are externally rotating structures rather than a structure in which the shaft hub rotates. The outer surface of the oil seal (40) can be manufactured with Teflon lips, and the inner surface can be manufactured in a shape in which rubber is coated on a metal material.

[0066] FIG. 12 is a front view and a perspective view of a dust cover.

[0067] A dust cover (50) is coupled to both sides of the first stator housing (110) and the second stator housing (120) to protect the bearings. The dust cover (50) may include coupling bolt holes (51) for coupling with the first stator housing (110) and the second stator housing (120). The dust cover (50) may be made of an aluminum alloy of A6061-T6 material.

[0068] FIG. 13 is a front view and a perspective view of a motor rotor.

[0069] Referring to FIG. 13, the motor rotor (60) may include a keyway (63) and a magnet attachment surface (62).

[0070] The motor rotor (60) is coupled to the first rotor housing (10). A keyway (63) is formed to restrain the rotation of the rotor core, and four keyways (63) may be arranged on the outer circumference of the motor rotor (60). A magnet attachment surface is a groove formed on the inner circumference of the motor rotor (60) to attach a magnet, and 54 grooves may be formed on the inner circumference of the motor rotor (60). The motor rotor (60) may be made of an electrical steel sheet with added silicon.

[0071] FIG. 14 is a front view and a perspective view of a motor stator.

[0072] Referring to FIG. 14, the motor stator (70) may include a tooth (73) and a keyway (72). The tooth (73) is formed to wind a coil on the outside of the motor stator (70) and may be formed on the outer surface of the motor stator (70). The keyway (72) is formed to restrain the rotation of the core of the motor stator (70) and may be formed on the inner surface of the motor stator (70).

[0073] FIG. 15 is a front view, a right side view, and a perspective view of the first stator housing.

[0074] Referring to FIG. 15, the first stator housing (110) may include a mounting groove (111), a coupling part (112), a dust cover tab (113), a key groove (114), a core coupling surface (115), and a cable gland tab (116).

[0075] The mounting groove (111) is a groove formed to connect the bearing (300) and may be formed on the outer surface of the first stator housing (110). The coupling portion (112) is a zone where the oil seal (40) is connected. The dust cover tab (113) may be a groove formed to secure the dust cover (50). The key groove (114) is formed to secure the core rotation of the motor stator (70), and four grooves may be formed on the outer surface of the first stator housing (110). The core coupling surface (115) is a surface formed to connect the motor stator (70) and may be formed on the outer surface of the first stator housing (110). The cable gland tab (116) is a hole formed to mount a cable gland that secures and seals the wiring cable. The wiring cables of the stator (220) secured in the fixing groove (150) can pass through the cable gland tab (116). The cable gland may also be referred to as a cable gland. The first stator housing (110) may be made of an aluminum alloy of A6061-T6.

[0076] A coupling piece (130) and a fixing piece (140) may be formed protrudingly on the inner surface of the first stator housing (110). A fixing groove (150) for fixing the stator (220) may be formed on the outer surface of the first stator housing (110). The fixing groove (150) may be formed in a portion of the outer surface of the first stator housing (110).

[0077] A connecting piece (130) may be formed to protrude in the same manner on the inner surface of the second stator housing (120) so as to face the first stator housing (110). A bolt hole may be formed in the connecting piece (130) so that a bolt and a nut can be fixed. When the first stator housing (110) and the second stator housing (120) are in close contact with each other, the connecting piece (130) of the first stator housing (110) and the connecting piece (130) of the second stator housing (120) are positioned in the same line, and then a bolt and a nut are fastened to fix the first stator housing (110) and the second stator housing (120) as a single unit.

[0078] The fixing piece (140) is for fixing the first stator housing (110) and the second stator housing (120) to the frame (2) of the moving means (1), and since it has the same configuration as the fixing piece (140) described with reference to FIGS. 5 and 6, the description thereof is omitted.

[0079] The fixing groove (150) is a groove formed to fix the stator (220). The fixing groove (150) is formed on the outer surface of the first stator housing (110), but may be formed in a partial section. The fixing groove (150) and the coupling part (112) are formed on the outer surface of the first stator housing (110), and an oil seal (40) is coupled to the coupling part (112). The fixing groove (150) is formed as a recess from the coupling part (112) into the inside of the first stator housing (110) so that the stator (220) is fixed, and the stator (220) does not interfere with the oil seal (40). The stator (220) can be fixed to the first stator housing (110) by fastening a bolt while the stator (220) is seated in the fixing groove (150).

[0080] FIG. 16 is a front view, a right side view, and a perspective view of the second stator housing.

[0081] Referring to FIG. 16, the second stator housing (120) may include a mounting groove (121), a seal attachment surface (122), a dust cover tab (123), a pressure regulator mounting groove (124), and a cable gland tab (125).

[0082] The mounting groove (121) is a groove formed to attach a bearing (300) and may be formed on the outer surface of the first stator housing (110). The seal attachment surface (122) is a zone where an oil seal (40) is attached. The dust cover tab (123) may be a groove formed to secure a dust cover (50). The pressure regulator mounting groove (124) may be a groove formed to mount a pressure regulator. The pressure regulator (not shown) has a porous filter made of fluoropolymer installed inside, which can block dust and moisture from outside the second stator housing (120) and discharge air from inside. The cable gland tab (125) is a hole formed to mount a cable gland that secures and seals a wiring cable. The cable gland tap (125) allows the coil (71) winding of the motor stator (70) core and the high-voltage cable to pass through, and the coil (71) winding and the high-voltage cable can be fixed to the cable gland tap (not shown) mounted on the cable gland tap (125).

[0083] A connecting piece (130) and a fixing piece (140) may be formed protrudingly on the outer surface of the second stator housing (120). Since this has the same configuration as the connecting piece (130) and fixing piece (140) described with reference to FIG. 15, a description thereof is omitted.

[0084] Figure 17 is an enlarged view showing the state in which a bearing is mounted on an in-wheel motor.

[0085] Referring to FIGS. 6 and FIGS. 17, the bearing (300) can be coupled to the mounting grooves (111, 121) of the first stator housing (110) and the second stator housing (120) and the fixing jaw (230) of the rotor (210). Through this, the first rotor housing (10) and the rotor (210) can be connected to the outer surface of the first stator housing (110) via the bearing (300), and the first rotor housing (10), the second rotor housing (20), the first rotor cover (30), the second rotor cover (30'), and the rotor (210) can rotate on the outside of the motor housing part (100) by means of the bearing (300). At this time, the motor housing part (100) is in a fixed state, and the first rotor housing (10), the second rotor housing (20), the first rotor cover (30), the second rotor cover (30'), and the rotor (210) are in a rotating state.

[0086] Fig. 18 is a cross-sectional view of the in-wheel motor shown in Fig. 1.

[0087] Referring to FIG. 18, the rotor (210) is attached to the other side of the first rotor housing (10) and fixed via a bolt (b), and the first rotor cover (30) is attached to the outer side of the rotor (210) and fixed via a bolt (b). More specifically, after the rotor (210) and the first rotor housing (10) are joined via a bolt, the first rotor cover (30) is attached to the assembly in which the rotor (210) and the first rotor housing (10) are joined.

[0088] The second rotor housing (20) is attached to one side of the first rotor housing (10) and fixed via a bolt (b), and the second rotor housing (20) can be fixed to the second rotor cover (30') via a bolt (b). More specifically, after the second rotor housing (20) and the second rotor cover (30') are joined via a bolt, the second rotor housing (20) and the second rotor cover (30') are joined to the first rotor housing (10) in an assembly state. A packing (not shown) using an O-ring can be installed between the second rotor housing (20) and the second rotor cover (30'), and a packing using an O-ring can be installed when joining all housings, such as the first rotor housing (10) and the second rotor housing (20).

[0089] An oil seal (40) may be coupled to a coupling portion (112) formed in the first stator housing (110), and a dust cover (50) that blocks the entry of foreign matter may be fixed to the first stator housing (110) outside the oil seal (40). At this time, the dust cover (50) is fixed to the first stator housing (110) and does not rotate.

[0090] The second stator housing (120) can be attached to one side of the first stator housing (110). The second rotor housing (20) and the second rotor cover (30') can be attached to the outer surface of the second stator housing (120).

[0091] Referring to FIGS. 17 and 18, the bearing (300) can be mounted in mounting grooves (111) (121) formed on the outer surface of the first stator housing (110) and the second stator housing (120). The first stator housing (110) and the second stator housing (120) are located on the inner side of the bearing (300), and the first rotor housing (10), the second rotor housing (20), the first rotor cover (30), the second rotor cover (30'), and the rotor (210) are located on the outer side. Since the rotor (210) rotates on the outer surface of the first stator housing (110) by means of the bearing (300), the internal space of the motor housing part (100) can be maintained as a hollow part (100'). This simplifies the internal structure, thereby reducing the load on the motor and lowering manufacturing costs, while simultaneously improving assembly.

[0092] FIG. 19 is a cross-sectional view along line B-B' of the in-wheel motor shown in FIG. 18.

[0093] Referring to FIGS. 18 and 19, a motor stator (70) is fixed to one side of the outer surface of the first stator housing (110), and a coil (71) can be wound around the motor stator (70). The coil (71) can generate a magnetic field when electrical energy is supplied from a battery (not shown) outside the motor. When electrical energy is supplied from a battery outside the motor and the in-wheel motor (A) rotates, the motor stator (70) and the coil (71) do not rotate.

[0094] A motor rotor (60) is coupled to the inner surface of the first rotor housing (10) in the shape of a circular ring, and a plurality of magnets (61) can be coupled radially to the inner surface of the motor rotor (60). At this time, the magnets (61) may be arranged with alternating N and S poles. When the coil (71) generates a magnetic field and current flows, the magnetic field of the magnets (61) and the magnetic field generated by the coil (71) interact to generate rotational torque.

[0095] FIG. 20 is a cross-sectional view along the C-C' line of the in-wheel motor shown in FIG. 18.

[0096] Referring to FIGS. 18 and 20, an electronic resolver (200) may be configured to be located on the outer circumference of the first stator housing (110) to measure the depth difference between the outer uneven surface (211) and the inner uneven surface (212) through the stator (220).

[0097] The rotor (210) is formed in a circular ring shape and is in close contact with the other side of the first rotor housing (10), and the rotor (210) and the first rotor housing (10) can be fixed by bolt connection. The outer surface of the rotor (210) is in close contact with the first rotor cover (30), and the rotor (210) and the first rotor cover (30) can be fixed by bolt connection. The rotor (210) is integrated with the first rotor housing (10) and the first rotor cover (30) and can rotate by means of a bearing (300).

[0098] The stator (220) can be fixed to the outer surface of the first stator housing (110). At this time, the stator (220) is not formed over the entire outer surface of the first stator housing (110), but can be fixed to the outer surface of the first stator housing (110) within a 45-degree angle range in the circumferential direction relative to the center of the first stator housing (110). Through this, the stator (220) is fixed integrally with the first stator housing (110) and is formed only in a part of the first stator housing (110), so manufacturing costs can be reduced and space utilization can be increased. In addition, since the stator (220) is structured to be fixed to the outer surface of the first stator housing (110), the hollow portion (100') of the motor housing portion (100) can be maintained.

[0099] The stator (220) can be formed from a PCB substrate, and a pattern can be printed on one side to function as a sensor. The side on which the pattern is printed can be the side facing the rotor (210). The stator (220) can be spaced 4-10 mm apart from the rotor (210) and face each other.

[0100] A person skilled in the art to which the present invention pertains will understand that, based on the foregoing description, other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0101] [Explanation of the symbol]

[0102] A: In-wheel motor

[0103] 10: 1st rotor housing 20: 2nd rotor housing

[0104] 30: 1st rotor cover 30': 2nd rotor cover

[0105] 40: Oil seal 50: Dust cover

[0106] 60: Motor rotor 70: Motor stator

[0107] 100: Motor housing part

[0108] 110: First stator housing 120: Second stator housing

[0109] 130: Connecting piece 140: Fixing piece

[0110] 150: Fixed groove 200: Electronic resolver

[0111] 210: Rotor 220: Stator

[0112] 230: Fixed jaw 240: Resolver housing

[0113] 300: Bearing

Claims

1. An electronic resolver embedded in an in-wheel motor comprising a first rotor housing and a motor housing portion, wherein Hollow circular resolver housing; A rotor formed along the inner circumferential surface of the above-mentioned resolver housing and receiving an electrical signal to generate eddy currents; and It includes a stator that transmits the electrical signal to the rotor, The above stator is integrally mounted to the first stator housing of the motor housing part, which is inserted into and coupled to the inside of the resolver housing. Electronic resolver.

2. In Paragraph 1, The above stator is, The above-mentioned rotor is spaced apart from and configured to face each other, Electronic resolver.

3. In Paragraph 1, The above stator is, Measuring the speed and position of the in-wheel motor according to the distance the electrical signal is transmitted to the rotor, Electronic resolver.

4. In Paragraph 1, The above stator is, Mounted on the outer surface of the first stator housing within a circumferential angle range of 45° with respect to the center of the motor housing portion, Electronic resolver.

5. In Paragraph 1, The above rotor is, An inner uneven surface formed to extend along the inner circumferential surface of the rotor; and A plurality of outer uneven surfaces are formed at regular intervals along the inner circumferential surface of the rotor, and include an outer uneven surface formed to be in contact with one side of the inner uneven surface. Electronic resolver.

6. In Paragraph 1, The above rotor is, The rotor is fixed in close contact with one surface of the first rotor housing, and the rotor cover is fixed in close contact with the outer surface of the rotor. Electronic resolver.

7. In Paragraph 6, The above rotor is, Rotating on the outside of the motor housing part together with the first rotor housing and the rotor cover by means of a bearing mounted on the outer circumference of the first stator housing, Electronic resolver.

8. In Paragraph 7, The further comprising a fixing jaw disposed on the inner circumference of the rotor and securing the rotor to the bearing, Electronic resolver.

9. In Paragraph 7, It further includes a first stator housing, The first stator housing above is, The having a mounting groove formed along the outer surface of the first stator and in which the bearing is mounted, Electronic resolver.

10. In Paragraph 9, The first stator housing above is, The structure further includes a fixing groove formed in one region of the outer surface of the first stator housing and for fixing the stator to the first stator housing. Electronic resolver.

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