Electric motor

Abstract

An electric motor, comprising: a rotor assembly (20), a stator assembly (10), and a bearing; the rotor assembly (20) and at least part of the stator assembly (10) are arranged along the radial direction of the motor in relation to each other, and the stator assembly (10) is configured to drive the rotor assembly (20) to rotate; in the radial direction, the bearing is located between the rotor assembly (20) and the stator assembly (10); and the bearing does not extend out of the two ends of the stator assembly (10) in the axial direction of the motor.

Description

motor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 7, 2023, with application number 202311676975.1 and application name “Motor”, the entire contents of which are incorporated by reference into this application.

[0003] This application claims priority to the Chinese patent application filed with the China Patent Office on December 7, 2023, with application number 202323341926.0 and application name “Motor”, the entire contents of which are incorporated by reference into this application. Technical Field

[0004] The present application relates to the field of electric drive technology, and in particular to a motor. Background Art

[0005] Bearings and bearing seats are crucial components for outputting mechanical energy from motors. Conventional bearings are typically mounted at the ends of the stator assembly, extending beyond the stator windings. This mounting method increases the motor's axial dimensions, hindering its flattening and resulting in larger motors. This, in turn, hinders the miniaturization of the devices incorporating the motors.

[0006] Application Contents

[0007] One purpose of the present application is to propose a motor in which the bearings are arranged between the rotor assembly and the stator assembly and do not extend beyond the two axial ends of the stator assembly, thereby reducing the axial size of the motor and facilitating miniaturization and flattening of the motor.

[0008] According to an embodiment of the present application, the motor includes: a rotor assembly; a stator assembly, at least a portion of the stator assembly and the rotor assembly are arranged along the radial direction of the motor and are configured to drive the rotor assembly to rotate; a bearing, the bearing is located between the rotor assembly and the stator assembly in the radial direction, and the bearing does not extend beyond both ends of the stator assembly in the axial direction of the motor.

[0009] According to the motor of the embodiment of the present application, the bearings are arranged between the rotor assembly and the stator assembly and do not extend out of the two axial ends of the stator assembly, which can reduce the axial size of the motor and is conducive to the miniaturization and flattening of the motor.

[0010] In addition, the motor according to the above embodiment of the present application may also have the following additional technical features:

[0011] In some embodiments, the stator assembly has a mounting hole, the bearing is mounted in the mounting hole, and the bearing does not extend out of the end surface of the stator assembly in the axial direction.

[0012] In some embodiments, the stator assembly includes a stator core and a stator winding connected to the stator core, the stator core and the stator winding both surround the mounting hole, at least a portion of the bearing is located inside the stator core in the radial direction, and the bearing does not extend out of the stator winding.

[0013] In some embodiments, the bearing is divided into a first half and a second half in the axial direction, the first half is arranged on the inner side of the stator core in the radial direction, and the second half is arranged on the inner side of the stator winding in the radial direction.

[0014] In some embodiments, the bearing is located inside the stator core in the radial direction.

[0015] In some embodiments, an inner boss is provided in the mounting hole, and the inner boss protrudes relative to the inner circumferential surface of the mounting hole. The bearings include multiple ones, and the multiple bearings include a first bearing and a second bearing. The first bearing and the second bearing are provided on both sides of the inner boss along the axial direction.

[0016] In some embodiments, the rotor assembly includes a rotor shaft, the rotor shaft passes through the mounting hole, and the bearing is disposed between an outer circumferential surface of the rotor shaft and an inner circumferential surface of the mounting hole.

[0017] In some embodiments, the rotor assembly further includes a rotor core, which surrounds the stator assembly and is disposed radially outside the stator assembly.

[0018] In some embodiments, the stator assembly includes a bearing seat and a stator core, the stator core is wound on the bearing seat, the bearing seat has a mounting hole extending along the axial direction, and the bearing is disposed in the bearing seat.

[0019] In some embodiments, the inner diameter d11 of the stator core is greater than the outer diameter d32 of the bearing.

[0020] In some embodiments, the outer diameter d22 of the bearing seat is less than or equal to the inner diameter d11 of the stator core.

[0021] In some embodiments, the difference between the inner diameter d21 and the outer diameter d22 of the bearing seat satisfies 5mm<d22-d21<10mm.

[0022] In some embodiments, a difference between an inner diameter d21 of the bearing seat and an outer diameter d32 of the bearing is not less than -x and not greater than x, wherein x is not less than 0.002 mm and not greater than 0.02 mm.

[0023] In some embodiments, the bearing seat includes a sleeve, an outer boss is provided on the outer circumferential surface of the sleeve, the stator core is wound and positioned on the outer circumferential surface of the sleeve, and the stator core is adjacent to the outer boss along the axial direction.

[0024] In some embodiments, the outer circumferential surface of the sleeve includes a first part and a second part, the first part and the second part are arranged along the axial direction, and the first part is closer to the outer boss than the second part, the radial dimension of the outer circumferential surface of the first part is larger than the radial dimension of the outer circumferential surface of the second part, and a step is constructed between the first part and the second part, and the stator core is wound around the first part.

[0025] In some embodiments, a height of the stator core in the axial direction is not less than a height of the first portion in the axial direction.

[0026] In some embodiments, the bearings include a plurality of bearings, the plurality of bearings include a first bearing and a second bearing, the first bearing and the second bearing are spaced apart along the axial direction, the height of the first bearing is h1, the height of the second bearing is h2, the spacing between the first bearing and the second bearing is s, the height dimension of the stator core in the stator assembly is T, and the height of the stator winding in the stator assembly is H, wherein s<T or T≤h1+h2+s≤H. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of a motor according to an embodiment of the present application.

[0028] FIG2 is a cross-sectional view of a motor according to an embodiment of the present application.

[0029] FIG3 is a cross-sectional view of a motor according to another embodiment of the present application.

[0030] FIG4 is a schematic diagram of a stator assembly and a bearing assembly of a motor according to an embodiment of the present application in one direction.

[0031] FIG5 is a schematic diagram of the stator assembly and bearing assembly of a motor according to an embodiment of the present application in another direction.

[0032] FIG6 is an exploded schematic diagram of a partial structure of a motor according to an embodiment of the present application.

[0033] FIG7 is a schematic diagram of a stator assembly according to an embodiment of the present application.

[0034] FIG8 is a cross-sectional view of a stator assembly according to an embodiment of the present application.

[0035] FIG9 is a partial enlarged schematic diagram of the circle D area in FIG8 .

[0036] FIG10 is an exploded schematic diagram of a stator assembly according to an embodiment of the present application.

[0037] FIG11 is a schematic diagram of a support frame of a stator assembly according to an embodiment of the present application.

[0038] Figure markings: motor 100, stator assembly 10, mounting hole 101, bearing seat 11, sleeve 111, inner boss 112, outer boss 113, first part 1101, second part 1102, annular groove 1103, first side 1104, second side 1105, stator core 12, inner end 121, outer end 122, stator winding 13, rotor assembly 20, rotor core 21, rotor shaft 22, first bearing 31, second bearing 32. Modes for Carrying Out the Invention

[0039] Bearings and bearing seats are crucial components for outputting mechanical energy from motors. In related technologies, bearing mounting structures typically involve one axial end of the bearing being embedded between the stator core and the stator winding, while the other end extends beyond the stator winding. This mounting method increases the motor's axial dimensions and hinders flattening. Furthermore, bearing seat design is crucial for its mechanical strength, installation space, and core slot area. Existing bearing-embedded structures have a relatively large core inner diameter and a relatively small slot area.

[0040] The present application proposes a motor in which a portion of the bearing in the axial direction is embedded in the stator core, and the end face on the other side does not extend out of the stator winding, thereby effectively reducing the axial size of the motor. The matching relationship between the inner and outer diameters of the bearing seat and the inner diameter of the stator core is reasonably designed in the radial direction, thereby ensuring the mechanical strength of the bearing seat, maximizing the slot area, ensuring the operating reliability and output performance of the motor, and improving the flatness of the motor.

[0041] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0042] As shown in Figures 1 to 3, a motor 100 according to an embodiment of the present application includes a rotor assembly 20, a stator assembly 10, and bearings. At least a portion of the stator assembly 10 and the rotor assembly 20 are arranged along the radial direction (A-A') of the motor 100, and the stator assembly 10 is configured to drive the rotor assembly 20 in rotation. The bearings are radially located between the rotor assembly 20 and the stator assembly 10 to reduce frictional resistance when the stator assembly 10 rotates relative to the rotor assembly 20. The bearings do not extend beyond the ends of the stator assembly 10 in the axial direction (C-C') of the motor 100. In other words, the bearings are disposed between the end surfaces of the stator assembly 10 at its axial ends.

[0043] According to the motor 100 of the embodiment of the present application, the bearings are arranged between the rotor assembly 20 and the stator assembly 10, and do not extend out of the two axial ends of the stator assembly 10. This can reduce the axial size of the motor 100, which is conducive to the miniaturization and flattening of the motor 100.

[0044] The motor 100 in the present application can be an outer rotor motor 100 or an inner rotor motor 100. In one embodiment, the rotor assembly 20 is rotatably disposed radially inside the stator assembly 10, and the stator assembly 10 drives the rotor assembly 20 to rotate. In this case, the bearing can be disposed radially inside the stator assembly 10 and does not extend beyond the axial ends of the stator assembly 10. In another embodiment, the rotor assembly 20 is rotatably disposed radially outside the stator assembly 10, and the stator assembly 10 drives the rotor assembly 20 to rotate. In this case, the bearing can be disposed radially outside the stator assembly 10 and does not extend beyond the axial ends of the stator assembly 10. In yet another embodiment, a portion of the rotor assembly 20 is rotatably disposed radially outside the stator assembly 10, and the other portion is disposed radially inside the stator assembly 10. In this case, the bearing can be disposed radially outside the stator assembly 10 or radially inside the stator assembly 10. The following description of the present application mainly uses the outer rotor motor 100, which does not limit the scope of protection of the present application.

[0045] In conjunction with Figures 1 to 6 , in some embodiments of the present application, the stator assembly 10 has a mounting hole 101, and a bearing is mounted in the mounting hole 101, and the bearing does not extend axially beyond the end surface of the stator assembly 10. At least a portion of the rotor assembly 20 can be disposed within the mounting hole 101, and the rotor assembly 20 and the stator assembly 10 are connected via a bearing, thereby facilitating the rotation of the rotor assembly 20 relative to the stator assembly 10. By providing the mounting hole 101 in the stator assembly 10 and mounting the bearing therein, the circumferential and radial dimensions of the motor 100 can be reduced, effectively improving the flatness and miniaturization of the motor 100.

[0046] 1 to 6 , stator assembly 10 includes a stator core 12 and a stator winding 13 connected to stator core 12. Both stator core 12 and stator winding 13 surround mounting hole 101. At least a portion of the bearing is radially inward of stator core 12, and the bearing does not extend beyond stator winding 13. By positioning at least a portion of the bearing inward of stator core 12, the stability of the fit between the bearing and stator core 12 is maintained, and the relative rotational stability between stator assembly 10 and rotor assembly 20 is improved.

[0047] In addition, the entire bearing may be provided inside the stator core 12 , or a portion of the bearing may be provided inside the stator core 12 .

[0048] As shown in FIG3 , in some examples of the present application, the bearing is divided into a first half and a second half in the axial direction, the first half is radially arranged on the inner side of the stator core 12, and the second half is radially arranged on the inner side of the stator winding 13. In other words, the first half is located on the inner side of the stator core 12, and the second half extends out of the stator core 12 and is located on the inner side of the stator winding 13. In other words, a part of the bearing is located on the inner side of the stator core 12, and the other part is located on the inner side of the stator winding 13. The height dimension of the stator core 12 in the axial direction can be effectively controlled, the production cost of the motor 100 can be reduced, and the stability of the bearing installation can be improved by utilizing the stator core 12 and the stator winding 13.

[0049] Furthermore, in some other examples of the present application, the bearings are radially located inside the stator core 12. In other words, all the bearings are disposed inside the stator core 12. This effectively improves the stability of the fit between the stator core 12 and the bearings, ensures stable installation of the bearings, and facilitates stable assembly and relative rotation of the rotor assembly 20 and the stator assembly 10.

[0050] In addition, the present application may include multiple bearings, and the multiple bearings are used to achieve stable installation of the stator assembly 10 and the rotor assembly 20. The mounting hole 101 is provided with an inner boss 112, which protrudes relative to the inner circumferential surface of the mounting hole 101. The multiple bearings include a first bearing 31 and a second bearing 32, which are arranged on both sides of the inner boss 112 along the axial direction. The inner boss 112 can be used to position the first bearing 31 and the second bearing 32, facilitating stable installation of the first bearing 31 and the second bearing 32 on the stator assembly 10.

[0051] In conjunction with the foregoing, the motor 100 in the present application may be an outer rotor motor 100. In a specific embodiment of the motor 100 in the present application, the rotor assembly 20 includes a rotor shaft 22, which is inserted into the mounting hole 101, and a bearing is disposed between the outer circumference of the rotor shaft 22 and the inner circumference of the mounting hole 101. Thus, the bearing can achieve stable assembly between the rotor shaft 22 and the stator assembly 10, facilitating the stator assembly 10 to drive the rotor assembly 20 to rotate. Placing the bearing inside the stator assembly 10 ensures a relatively appropriate gap between the stator and the rotor, maintaining the driving force of the stator assembly 10 on the rotor assembly 20 while also maintaining the rotational stability of the rotor assembly 20 relative to the stator assembly 10.

[0052] As shown in Figures 2 and 3 , in some embodiments of the present application, the rotor assembly 20 further includes a rotor core 21, which surrounds the stator assembly 10 and is disposed radially outward of the stator assembly 10. In other words, the motor 100 is an outer rotor motor 100. In combination with the foregoing, the rotor assembly 20 may further include a rotor shaft 22 connected to the rotor core 21. The rotor shaft 22 cooperates with bearings to achieve relatively stable rotation between the stator assembly 10 and the rotor assembly 20. By externally positioning the rotor core 21, the air gap between the stator assembly 10 and the rotor assembly 20 can be maintained, thereby optimizing the performance of the motor 100.

[0053] As shown in Figures 3, 6, and 8, the stator assembly 10 includes a bearing seat 11 and a stator core 12. The stator core 12 is wound around the bearing seat 11. The bearing seat 11 has a mounting hole 101 extending axially therein, and the bearing is disposed within the bearing seat 11. The bearing seat 11 facilitates the installation of the stator core 12 and allows the bearing to be mounted on the bearing seat 11, thereby optimizing the stator assembly 10 and the mating structure between the stator assembly 10 and the bearing. The bearing seat 11 has a mounting hole 101, and the structure of the mounting hole 101 and the mating structure between the mounting hole 101 and the bearing can be referred to above.

[0054] As shown in FIG3 , in some embodiments of the present application, the inner diameter d11 of the stator core 12 is larger than the outer diameter d32 of the bearing, thereby ensuring that the bearing can be embedded in the stator core 12 and maintaining the stability and structural strength of the fit between the bearing and the stator core 12 .

[0055] In conjunction with Figures 3 and 8 , in some embodiments of the present application, the outer diameter d22 of the bearing seat 11 is less than or equal to the inner diameter d11 of the stator core 12. The bearing seat 11 and the stator core 12 can be connected using a transition fit or a clearance fit, which facilitates the stable installation of the stator core 12 on the bearing seat 11 and improves the structural stability of the stator assembly 10. Alternatively, the stator core 12 and the bearing seat 11 can be stably connected using interference fit, injection molding, bonding, or other methods.

[0056] In order to maximize the core slot area and take into account the installation space of the bearing seat 11, the outer diameter d22 of the bearing seat 11 can be set to be the same as the inner diameter d11 of the core.

[0057] As shown in FIG8 , in some embodiments of the present application, the difference between the inner diameter d21 and the outer diameter d22 of the bearing seat 11 satisfies 5mm<d22-d21<10mm. This can improve the mechanical strength of the bearing seat 11, provide a larger installation space, and maximize the stator slot area.

[0058] In some embodiments of the present application, the difference between the inner diameter d21 of the bearing seat 11 and the outer diameter d32 of the bearing is not less than -x and not greater than x, where x is not less than 0.002 mm and not greater than 0.02 mm. This facilitates stable fit between the bearing seat 11 and the bearing, improves the stability of the motor 100, extends the service life of the motor 100, and optimizes the performance of the motor 100.

[0059] In some embodiments of the present application, multiple bearings are provided, including a first bearing 31 and a second bearing 32. The first bearing 31 and the second bearing 32 are spaced axially apart. The height of the first bearing 31 is h1, the height of the second bearing 32 is h2, and the spacing between the first bearing 31 and the second bearing 32 is s. The height of the stator core 12 in the stator assembly 10 is T, and the height of the stator winding 13 in the stator assembly 10 is H, where s < T or T ≤ h1 + h2 + s ≤ H. This can reduce the axial dimensions of the motor 100 by axially embedding one end face of the first bearing 31 and the second bearing 32 inside the core, while ensuring the overall structural reliability of the motor 100.

[0060] As shown in Figures 7 and 8, the stator assembly 10 according to the embodiment of the present application includes: a bearing seat 11 and a stator core 12, a plurality of stator cores 12 are connected in a long strip shape, and the stator core 12 is wound on the bearing seat 11 along the circumference (B-B') of the bearing seat 11. When the stator core 12 is wound on the bearing seat 11, the plurality of stator cores 12 are arranged along the circumference of the bearing seat 11. By winding the stator core 12 on the bearing seat 11, the stable assembly of the bearing seat 11 and the stator core 12 can be facilitated, thereby improving the assembly efficiency of the stator assembly 10. By winding the stator core 12 in a long strip shape on the bearing seat 11 to form the stator assembly 10, the structure of the stator assembly 10 can be simplified, and the forming efficiency of the stator assembly 10 can be improved. The present application ensures a high winding slot full rate of the stator assembly 10 while having low cost, and ensures the roundness accuracy of the stator assembly 10 through the bearing seat 11.

[0061] As shown in Figures 7 and 8, in some embodiments, the stator core 12 has an inner end 121 and an outer end 122. The inner ends 121 of multiple stator cores 12 are sequentially connected to form an elongated strip. When the stator core 12 is wound on the bearing seat 11, the inner end 121 of the stator core 12 is closer to the bearing seat 11 than the outer end 122. The stator core 12 can be configured to extend radially along the bearing seat 11. One of the adjacent stator cores 12 can rotate relative to the other around the bearing seat 11, thereby bending the elongated stator core 12 into an arc. By connecting the inner ends 121 of multiple stator cores 12 and winding them around the bearing seat 11, the molding efficiency of the stator core 12 can be improved. When the stator core 12 is wound on the bearing seat 11, the stator core 12 and the bearing seat 11 can be stably mounted, thereby improving the assembly efficiency and stability of the stator assembly 10. In addition, the winding on the stator core 12 can be completed before being wound on the bearing seat 11, which can simplify the formation of the winding and improve the installation efficiency of the winding.

[0062] In addition, in the present application, the outer ends 122 of the multiple stator cores 12 can also be connected to form a long strip, which can also achieve the purpose of connecting the multiple stator cores 12 into a long strip and winding it on the bearing seat 11. This application mainly uses the example of connecting the inner ends 121 of the multiple stator cores 12 into a long strip, which is not intended to limit the scope of protection of this application.

[0063] In some embodiments of the present application, an insulating frame (not shown) is further included, to which multiple stator cores 12 are connected, and the insulating frame is wound around the bearing seat 11. The insulating frame can connect the multiple stator cores 12 together, facilitates connecting the multiple stator cores 12 to the bearing seat 11, and arranges them along the circumference of the bearing seat 11. In addition, the insulating frame can ensure insulation between the stator cores 12 and other components, ensure the structural stability of the stator assembly 10, improve the production efficiency of the motor 100 having the stator assembly 10, and ensure the stability and service life of the motor 100.

[0064] The insulating frame may include multiple connecting portions, which are sequentially connected to form an elongated strip. One adjacent connecting portion is rotatable relative to another about the bearing seat 11. The inner ends 121 of the stator cores 12 are each connected to the multiple connecting portions. The multiple connecting portions allow connection to multiple stator cores 12 and facilitate rotatable connection between adjacent stator cores 12. The rotatable connection of adjacent connecting portions facilitates the winding of the insulating frame around the bearing seat 11, achieving a stable connection between the multiple stator cores 12 and the bearing seat 11.

[0065] As shown in Figures 8 and 11, in some embodiments of the present application, the bearing seat 11 includes a sleeve 111, and an outer boss 113 is provided on the outer peripheral surface of the sleeve 111. The stator core 12 is set and positioned on the outer peripheral surface of the sleeve 111, and the stator core 12 and the outer boss 113 are adjacent to each other in the axial direction of the bearing seat 11. The outer boss 113 can facilitate the stable connection between the stator core 12 and the sleeve 111. In addition, the outer boss 113 can be used to locate the position of the stator core 12, improve the positioning accuracy of the positioning core, and ensure the yield and energy efficiency of the motor 100. Among them, one end of the stator core 12 along the axial direction can be abutted and matched with the outer boss 113.

[0066] As shown in Figures 8 and 11, the outer circumferential surface of the sleeve 111 includes a first portion 1101 and a second portion 1102. The first portion 1101 and the second portion 1102 are arranged axially, and the first portion 1101 is closer to the outer boss 113 than the second portion 1102. The radial dimension of the outer circumferential surface of the first portion 1101 is larger than the radial dimension of the outer circumferential surface of the second portion 1102, and a step is formed between the first portion 1101 and the second portion 1102. The stator core 12 is wound around the first portion 1101 along the circumference of the bearing seat 11. By configuring the outer circumferential surface of the sleeve 111 into a stepped shaft shape, the stator core 12 can be stably mounted on the first portion 1101, thereby improving the stability of the assembly of the sleeve 111 and the stator core 12.

[0067] As shown in Figure 8, the axial dimension of the stator core 12 is not less than the axial dimension of the first portion 1101. This can further improve the matching accuracy between the sleeve 111 and the stator core 12 and avoid over-positioning of the stator core 12.

[0068] As shown in Figures 8 and 9, in some embodiments of the present application, an annular groove 1103 is provided on one side of the outer boss 113 in the axial direction. The annular groove 1103 is provided at the root of the outer boss 113, and the annular groove 1103 has a first side surface 1104 and a second side surface 1105 that are opposite to each other. The first side surface 1104 is provided on the inner side of the second side surface 1105, and the first side surface 1104 is flush with the outer peripheral surface or recessed relative to the outer peripheral surface. In other words, the annular groove 1103 is opposite to the inner peripheral edge of the end of the stator core 12, so that the annular groove 1103 makes way for the inner peripheral edge of the end of the stator core 12. By providing the annular groove 1103, the stator core 12 and the outer boss 113 can be stably matched, and the root structure of the outer boss 113 can be prevented from affecting the matching between the stator core 12 and the outer boss 113.

[0069] As shown in Figures 2, 3, and 8, in some embodiments of the present application, an inner boss 112 is provided on the inner circumferential surface of the sleeve 111, and the inner boss 112 is spaced apart from both ends of the sleeve 111. Bearings can be provided on both axial sides of the inner boss 112, thereby utilizing the bearings to achieve a stable connection between the bearing seat 11 and the outer rotor, facilitating rotatable engagement between the stator assembly 10 and the rotor assembly 20.

[0070] 1 to 3 , in some embodiments of the present application, a motor 100 may include a stator assembly 10 and a rotor assembly 20. The stator assembly 10 may include a bearing seat 11 and a stator core 12. The rotor assembly 20 may include a rotor core 21 and a rotor shaft 22. The rotor shaft 22 is connected to the rotor core 21. At least a portion of the bearing seat 11 is radially disposed inside the rotor core 21, and the rotor shaft 22 is rotatably inserted into the bearing seat 11. Bearings are provided on opposite sides of an inner boss 112, and the rotor shaft 22 is inserted into the bearings. The bearings are disposed inside the bearing seat 11. The inner boss 112 facilitates stable mating of the dual bearings with the bearing seat 11.

[0071] In some embodiments of the present application, a first positioning portion (not shown) and a second positioning portion (not shown) are respectively provided at both ends of the stator core 12. The stator core 12 is wound in a ring shape. The connection between the first and second positioning portions allows the two ends of the stator core 12 to be positioned together, facilitating the winding of the stator core 12 along the circumference of the bearing seat 11 and improving the stability of the assembly structure between the bearing seat 11 and the stator core 12. In addition, in combination with the aforementioned embodiments, the first and second positioning portions can be provided at both ends of the insulating frame.

[0072] In some examples of the present application, the first positioning portion and the second positioning portion are connected. For example, a dovetail groove can be provided on the first positioning portion, and a dovetail block can be provided on the second positioning portion. The dovetail block can be stably matched with the dovetail groove to achieve the connection between the first positioning portion and the second positioning portion, and the stator core 12 can be constructed into a stable annular structure.

[0073] In other embodiments of the present application, the core slot further includes a positioning member connected to the first positioning portion and the second positioning portion. The positioning member can thereby stably connect the first positioning portion and the second positioning portion, thereby achieving connection between the first positioning portion and the second positioning portion and forming the stator core 12 into a stable annular structure. The positioning member can be a pin, a screw, a buckle, or the like.

[0074] For example, the first positioning portion and the second positioning portion may be arranged to overlap along the circumferential portion of the bearing seat 11 , and the first positioning portion and the second positioning portion may be stably connected together by a structure such as a latch.

[0075] The stator assembly 10 of the present application is used in a motor 100, particularly an outer rotor motor 100. The inner diameter side of the stator core 12 of the stator assembly 10 is radially positioned by a bearing seat 11. The bearing seat 11 comprises a sleeve and an outer boss 113, which is connected to the outer side of the sleeve and arranged along the circumference of the sleeve. The bearing seat 11 positions the inner diameter side of the stator core 12, thereby ensuring the dimensional accuracy of the stator.

[0076] In addition, in conjunction with the previous embodiment, the stator assembly 10 includes: multiple stator cores 12, each of which has a block-type structure. The stator assembly 10 also includes an insulating frame (not shown) and a bearing seat 11. The stator cores 12 are connected to form a straight bar structure (not shown) via the insulating frame. After the stator winding is completed, the stator is rounded. This technical method has the technical advantages of high material utilization of the stator core 12 and a high winding slot fill rate.

[0077] Furthermore, when the stator is bent into a circle, in order to ensure the stator forming accuracy, the bearing seat 11 is supported on the inner diameter side of the stator core 12, thereby realizing the radial positioning function of the stator core 12, and then the stator core 12 and the bearing seat 11 are molded into one piece through molding (not shown in the figure) to fix the stator.

[0078] Furthermore, the bearing seat 11 has an outer boss 113 and a sleeve. The sleeve is used to support the inner diameter of the stator core 12 , and the outer boss 113 is used to ensure the axial relative position of the bearing seat 11 and the stator core 12 .

[0079] Furthermore, the inner boss 112 and the outer boss 113 on the bearing seat 11 can be arranged along the circumference of the sleeve, and can be a whole circle or divided into multiple bosses, as long as they have the axial positioning effect.

[0080] Furthermore, the bearing seat 11 may also have the function of supporting the bearings of the motor 100 .

[0081] Furthermore, the bearing seat 11 may be made of metal or plastic, or other materials, such as a mixed structure of metal and plastic.

[0082] As shown in Figures 1 to 11, the motor 100 according to an embodiment of the present application includes: a rotor assembly 20; according to the aforementioned stator assembly 10, the stator assembly 10 cooperates with the rotor assembly 20 and is configured to drive the rotor assembly 20 to rotate. By forming the stator assembly 10 by winding the stator core 12, which is arranged in an elongated strip, onto the bearing seat 11, the structure of the stator assembly 10 can be simplified and the forming efficiency of the stator assembly 10 can be improved. The present application ensures a high winding slot fill rate of the stator assembly 10 while being low in cost, and the roundness accuracy of the stator assembly 10 is ensured by the bearing seat 11.

[0083] In some embodiments, at least a portion of the stator assembly 10 is assembled radially inwardly of the rotor assembly 20. In other words, the motor 100 is an outer rotor motor 100, and the outer rotor motor 100 uses the aforementioned stator assembly 10, which can improve the structural stability of the motor 100 and facilitate assembly.

[0084] The present application proposes a bearing embedded structure, through the cooperation between the bearing, the bearing seat 11, and the stator core 12, in the axial direction, the end faces of one side of the two bearings are embedded in the stator core 12, and the end faces of the other side do not extend out of the end face of the stator winding 13. In the radial direction, considering the mechanical strength, installation space and impact on the area of ​​the stator core 12 of the bearing seat 11, the cooperation relationship between the outer diameter of the bearing seat 11 and the inner diameter of the stator core 12 is reasonably designed. The present application effectively reduces the axial size of the motor 100, maximizes the area of ​​the core slot, and takes into account the mechanical strength of the bearing seat 11, solves the axial size redundancy problem of the motor 100 caused by the existing bearing embedded structure, improves the flatness of the motor 100, and ensures the operating reliability and output performance of the motor 100. The present application aims to solve the problem of increased axial size of the motor 100 caused by the existing bearing embedded structure, so as to improve the flatness of the motor 100, while taking into account the installation space, mechanical strength and maximization of the core slot area of ​​the bearing seat 11.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0087] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0088] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0089] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0090] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A motor (100), wherein: include: Rotor assembly (20); a stator assembly (10), at least a portion of the stator assembly (10) and the rotor assembly (20) being arranged along the radial direction of the motor (100) and configured to drive the rotor assembly (20) to rotate; A bearing, wherein the bearing is located between the rotor assembly (20) and the stator assembly (10) in the radial direction, and the bearing does not extend beyond the two ends of the stator assembly (10) in the axial direction of the motor (100).

2. The electric machine (100) according to claim 1, wherein: The stator assembly (10) has a mounting hole (101), the bearing is mounted in the mounting hole (101), and the bearing does not extend out of the end surface of the stator assembly (10) in the axial direction.

3. The electric machine (100) according to claim 2, wherein: The stator assembly (10) comprises a stator core (12) and a stator winding (13) connected to the stator core (12); the stator core (12) and the stator winding (13) both surround the mounting hole (101); at least a portion of the bearing is located inside the stator core (12) in the radial direction, and the bearing does not extend out of the stator winding (13).

4. The electric machine (100) according to claim 3, wherein: The bearing has a first half and a second half in the axial direction, the first half is arranged on the inner side of the stator core (12) in the radial direction, and the second half is arranged on the inner side of the stator winding (13) in the radial direction; Alternatively, the bearing is located inside the stator core (12) in the radial direction.

5. The electric machine (100) according to claim 2, wherein: An inner boss (112) is provided in the mounting hole (101), and the inner boss (112) protrudes relative to the inner circumferential surface of the mounting hole (101). The bearings include a plurality of bearings, and the plurality of bearings include a first bearing (31) and a second bearing (32). The first bearing (31) and the second bearing (32) are provided on both sides of the inner boss (112) along the axial direction.

6. The electric machine (100) according to claim 2, wherein: The rotor assembly (20) comprises a rotor shaft (22), the rotor shaft (22) is inserted into the mounting hole (101), and the bearing is arranged between the outer circumferential surface of the rotor shaft (22) and the inner circumferential surface of the mounting hole (101).

7. The electric machine (100) according to any one of claims 1 to 6, wherein: The rotor assembly (20) further comprises a rotor core (21), wherein the rotor core (21) surrounds the stator assembly (10), and the rotor core (21) is arranged radially outside the stator assembly (10).

8. The electric machine (100) according to any one of claims 1 to 7, wherein: The stator assembly (10) comprises a bearing seat (11) and a stator core (12); the stator core (12) is wound on the bearing seat (11); a mounting hole (101) extending along the axial direction is provided in the bearing seat (11); and the bearing is arranged in the bearing seat (11).

9. The electric machine (100) according to claim 8, wherein: The inner diameter d11 of the stator core (12) is greater than the outer diameter d32 of the bearing; Or, the outer diameter d22 of the bearing seat (11) is less than or equal to the inner diameter d11 of the stator core (12); Or, the difference between the inner diameter d21 and the outer diameter d22 of the bearing seat (11) satisfies 5mm<d22-d21<10mm; Or, the difference between the inner diameter d21 of the bearing seat (11) and the outer diameter d32 of the bearing is not less than -x and not greater than x, wherein x is not less than 0.002 mm and not greater than 0.02 mm.

10. The electric machine (100) according to claim 8, wherein: The bearing seat (11) comprises a sleeve (111), an outer boss (113) is provided on the outer peripheral surface of the sleeve (111), the stator core (12) is set and positioned on the outer peripheral surface of the sleeve (111), and the stator core (12) and the outer boss (113) are adjacent to each other along the axial direction.

11. The electric machine (100) according to claim 10, wherein: The outer circumferential surface of the sleeve (111) comprises a first portion (1101) and a second portion (1102), the first portion (1101) and the second portion (1102) are arranged along the axial direction, and the first portion (1101) is closer to the outer boss (113) than the second portion (1102), the radial dimension of the outer circumferential surface of the first portion (1101) is greater than the radial dimension of the outer circumferential surface of the second portion (1102), and a step is constructed between the first portion (1101) and the second portion (1102), and the stator core (12) is wound around the first portion (1101), Wherein, the height of the stator core (12) in the axial direction is not less than the height of the first part (1101) in the axial direction.

12. The electric machine (100) according to any one of claims 1 to 11, wherein: The bearings include a plurality of bearings, the plurality of bearings include a first bearing (31) and a second bearing (32), the first bearing (31) and the second bearing (32) are spaced apart along the axial direction, the height of the first bearing (31) is h1, the height of the second bearing (32) is h2, the spacing between the first bearing (31) and the second bearing (32) is s, the height dimension of the stator core (12) in the stator assembly (10) is T, the height of the stator winding (13) in the stator assembly (10) is H, wherein s<T or T≤h1+h2+s≤H.

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