Stator assembly and external-rotor electric motor

Abstract

Disclosed in the present application are a stator assembly and an external-rotor electric motor. The stator assembly (100) comprises a base (110), a sleeve (120), a stator core (130) and an insulating support (140). One end of the sleeve (120) is connected to the base (110); the stator core (130) is sleeved on the outside of the sleeve (120); and the insulating support (140) is connected to the end of the stator core (130) facing the base (110), wherein the insulating support (140), the sleeve (120) and the stator core (130) together define an accommodating cavity (150).

Description

Stator assembly and outer rotor motor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202310978403.2, filed on August 3, 2023, entitled “Stator Assembly and External Rotor Motor,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of motors, and in particular to a stator assembly and an outer rotor motor. Background Art

[0004] Motors are typically categorized as outer rotor motors and inner rotor motors based on the relative position of the rotor and stator. Outer rotor motors, with their space-saving and compact design, have attracted widespread attention. Currently, outer rotor motors are typically assembled by interference fitting the stator core and bearing seat, typically using cold pressing. Since the bearing seat is typically made of aluminum alloy and the stator core is made of silicon steel sheets, during the cold pressing process of the stator core, the outer ring of the bearing seat sleeve will be squeezed and scraped by the stator core, generating debris. After the stator is installed, this debris remains in the motor. During operation, the debris will adhere to the stator core or the surface of the magnetic tile, potentially causing scratches between the stator and rotor, affecting motor efficiency and generating motor noise.

[0005] Therefore, how to effectively reduce the impact of debris generated by extrusion and scratching during the assembly of the stator core on the motor is a technical problem that needs to be urgently solved in this field. Summary of the Invention

[0006] The main purpose of this application is to provide a stator assembly and an outer rotor motor.

[0007] To achieve the above objectives, a first embodiment of the present application provides a stator assembly for an outer rotor motor, the stator assembly comprising:

[0008] base;

[0009] a sleeve, one end of which is connected to the base;

[0010] a stator core, sleeved outside the sleeve; and

[0011] an insulating bracket connected to the end of the stator core facing the base;

[0012] The insulating bracket, the sleeve and the stator core jointly define an accommodating cavity.

[0013] In some embodiments, the accommodating cavity is an annular chamber surrounding the sleeve.

[0014] In some embodiments, the wall of the stator core used to define the accommodating cavity is in a ring shape surrounding the sleeve.

[0015] In some embodiments, the insulating bracket has an inner circumferential wall arranged around the sleeve, and the insulating bracket includes a first annular flange provided on the inner circumferential wall and arranged around the sleeve, the first annular flange abuts the outer circumferential wall of the sleeve, and the first annular flange is used to define the accommodating cavity.

[0016] In some embodiments, the first annular flange is located at the end of the inner peripheral wall away from the stator core; or,

[0017] The first annular flange is located at a middle portion of the inner peripheral wall along a direction parallel to the axis of the sleeve.

[0018] In some embodiments, the sleeve includes a second annular flange provided on and arranged around the outer peripheral wall, and the second annular flange abuts against the first annular flange.

[0019] In some embodiments, along the axial direction of the sleeve, the first annular flange abuts against a side of the second annular flange facing away from the stator core.

[0020] In some embodiments, along the axial direction of the sleeve, the sleeve includes a first section connected to the stator core and a second section connected to the insulating bracket, the first section and the second section have the same diameter, and the first annular flange abuts the side of the second annular flange facing the stator core to locate the relative position of the stator core with respect to the sleeve.

[0021] In some embodiments, along a direction parallel to the axis of the sleeve, the outer ring of the first annular flange is located on a side of the inner ring facing away from the stator core; or, along a direction parallel to the axis of the sleeve, the outer ring of the first annular flange is located on a side of the inner ring facing the stator core.

[0022] In some embodiments, the insulating bracket has an inner circumferential wall arranged around the sleeve, the insulating bracket includes a first annular flange provided on the inner circumferential wall and arranged around the sleeve, the sleeve includes a second annular flange provided on the outer circumferential wall and arranged around the outer circumferential wall, the first annular flange abuts the second annular flange, and the first annular flange is used to define the accommodating cavity.

[0023] In some embodiments, along the axial direction of the sleeve, the sleeve includes a first section connected to the stator core and a second section connected to the insulating bracket, the diameter of the first section is smaller than the diameter of the second section, the second section has an annular end surface arranged around the first section, and the end surface of the stator core facing the base abuts the annular end surface.

[0024] In some embodiments, the annular end surface is provided with a guide groove, and the guide groove is communicated with the accommodating cavity.

[0025] In some embodiments, the sleeve has an outer peripheral wall, and the sleeve includes a second annular flange provided on and arranged around the outer peripheral wall, the second annular flange abuts against the insulating bracket, and the second annular flange is used to define the accommodating cavity.

[0026] In some embodiments, the insulating bracket has an inner circumferential wall arranged around the sleeve, and the second annular flange abuts against the inner circumferential wall.

[0027] In some embodiments, the sleeve has an outer peripheral wall, and the sleeve includes a second annular flange provided on and arranged around the outer peripheral wall. The second annular flange has an annular surface facing away from the base. The diameter of the annular surface gradually increases along the direction from the stator core to the base, and the end of the insulating bracket facing away from the stator core abuts the annular surface.

[0028] An embodiment of the second aspect of the present application further provides an outer rotor motor, comprising:

[0029] The stator assembly of any of the above; and

[0030] The rotor assembly is sleeved on the outside of the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] FIG1 is a side cross-sectional schematic diagram of a stator assembly provided in one embodiment of the present application;

[0033] FIG2 is a partial enlarged schematic diagram of point A in FIG1 ;

[0034] FIG3 is a perspective schematic diagram of a base and a sleeve provided in another embodiment of the present application;

[0035] FIG4 is a second side schematic diagram of the assembly of the base, sleeve, and insulating bracket provided in another embodiment of the present application;

[0036] FIG5 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0037] FIG6 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0038] FIG7 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0039] FIG8 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0040] FIG9 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0041] FIG10 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0042] FIG11 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0043] FIG12 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0044] FIG13 is a partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in another embodiment of the present application;

[0045] FIG14 is a partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in another embodiment of the present application; wherein the dotted line indicates the boundary between the first section and the second section;

[0046] FIG15 is a partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in another embodiment of the present application; wherein the dotted line indicates the boundary between the first section and the second section;

[0047] FIG16 is a partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in another embodiment of the present application; wherein the dotted line indicates the boundary between the first section and the second section;

[0048] FIG17 is a partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in another embodiment of the present application; wherein the dotted line represents the boundary between the first section and the second section; and

[0049] Figure 18 is a side schematic diagram of the outer rotor motor provided in the embodiment of the second aspect of the present application.

[0050] Description of Figure Numbers:

[0051] 100-stator assembly;

[0052] 110-base;

[0053] 120 - sleeve; 121 - outer peripheral wall; 122 - second annular flange; 1221 - annular surface; 123 - first section; 124 - second section; 1241 - annular end surface; 12411 - guide groove;

[0054] 130- stator core;

[0055] 140 - insulating bracket; 141 - inner peripheral wall; 142 - first annular flange;

[0056] 150-accommodation cavity;

[0057] 200-outer rotor motor; 210-rotor assembly.

[0058] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0059] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0060] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0062] Motors are generally categorized as outer rotor motors and inner rotor motors based on the relative position of the rotor and stator. Outer rotor motors, with their space-saving and compact design, have attracted widespread attention. Conventional outer rotor motors are equipped with two bearings: one mounted in a bearing chamber on the bottom of the end cap, and the other in a bearing housing at the other end of the stator core. The rotor assembly fits over the stator assembly, with one end of the rotating shaft positioned within the stator's center hole and rotatingly engaged with it via a bearing. Currently, the stator core of an outer rotor motor is typically assembled by creating an interference fit between the stator core and the bearing housing, typically achieved through cold pressing. Since the bearing housing is typically made of aluminum alloy and the stator core is made of silicon steel sheets, during the cold pressing process, the outer ring of the bearing housing sleeve can be squeezed and scraped by the stator core, generating debris. After the stator is installed, this debris remains in the motor. During operation, the debris can adhere to the stator core or the surface of the magnetic tiles, potentially causing scratches between the stator and rotor, affecting motor efficiency and generating noise. In the related art, the debris cleaning method used for the above-mentioned debris often has low cleaning efficiency and high time and labor costs; or the method of increasing the wear resistance of the sleeve material is used, which still produces some debris and still fails to effectively reduce the impact of the debris on the motor.

[0063] 1 to 17 , an embodiment of a first aspect of the present application provides a stator assembly 100 for an outer rotor motor 200 . The stator assembly 100 includes a base 110 , a sleeve 120 , a stator core 130 , and an insulating bracket 140 .

[0064] 1-2 , the base 110 can be used to fix the stator assembly 100. Specifically, the base 110 can be a bearing seat and used to connect a bearing.

[0065] 1-2 , one end of the sleeve 120 is connected to the base 110. In various embodiments, the sleeve 120 and the base 110 may be connected in a fixed or detachable manner, or the sleeve 120 may be integrally formed with the base 110. In some embodiments, the sleeve 120 may have a through hole extending axially thereof.

[0066] 1-2 , the stator core 130 is sleeved on the outside of the sleeve 120. It is understood that, in some embodiments, the sleeve 120 extends in an annular shape, and the sleeve 120 has an axis corresponding to the annular circumferential wall of the sleeve 120. In some embodiments, the structure of the stator core 130 may include an inner core and a plurality of independent outer core units uniformly arranged around the circumference of the inner core, the inner core being sleeved on the sleeve 120, and each outer core unit being connected to the inner core, thereby forming an integrated stator core 130 structure through the connection structure. In addition, the stator core 130 may also have other forms of structure, for details, please refer to the prior art, which will not be described here.

[0067] In some embodiments, the stator assembly 100 may further include a coil winding. The coil winding may be formed by winding one or more wires, typically copper or aluminum wire. The winding may be circular, square, rectangular, or other shapes. The coil winding may be wound around the outside of the core unit of the stator core 130. When powered on, the coils generate a rotating magnetic field, driving the rotor outside the stator to begin rotating.

[0068] Referring to Figures 1-2 , an insulating bracket 140 is connected to the end of the stator core 130 facing the base 110. The primary function of insulating bracket 140 is to isolate the core from the coil windings. After insulating bracket 140 is connected to the stator, the coils can be wound around insulating bracket 140. After winding, the coils can be tied together to form the finished stator assembly 100.

[0069] In some embodiments, two insulating brackets 140 can be respectively arranged at the two ends of the stator core 130 along the axial direction. In order to achieve a better insulation effect, in some embodiments, insulating paper can be arranged between each core unit of the stator core 130. Specifically, the insulating paper can be arranged in the winding slot, and the insulating brackets 140 are arranged at both ends of the stator core 130 in a one-to-one correspondence. The insulating paper can insulate and isolate the side walls of the core units adjacent to each other along the circumferential direction from the coil winding, and the insulating brackets 140 can insulate and isolate the core units at the ends from the coil winding. Thus, the insulating brackets 140 and the insulating paper can jointly form the insulation effect between the stator core 130 and the coil. In other embodiments, the two insulating brackets 140 located at the two ends of the stator core 130 along the axial direction can be further extended along the radial direction of the axis of the sleeve 120 and spliced ​​with each other, so that the stator core 130 can be wrapped, so that the insulating brackets 140 can simultaneously insulate and isolate the ends of the stator core 130 and the slots on both sides of the stator core 130 along the circumferential direction.

[0070] 2 , the insulating bracket 140, the sleeve 120, and the stator core 130 jointly define an accommodating cavity 150. Specifically, in one configuration of the accommodating cavity 150, the sleeve 120 may define a wall surface of the accommodating cavity 150 on the smaller diameter side relative to the axis of the sleeve 120, the wall surface of the insulating bracket 140 facing the sleeve 120 may define a wall surface of the accommodating cavity 150 on the larger diameter side relative to the axis of the sleeve 120, the flange of the insulating bracket 140 may define the top surface of the accommodating cavity 150, and the stator core 130 may define the bottom surface of the accommodating cavity 150. In other configurations of the accommodating cavity 150, the flange of the insulating bracket 140 may jointly define the top surface of the accommodating cavity 150 with the flange of the sleeve 120, or the stator core 130 and the insulating bracket 140 may jointly define the bottom surface of the accommodating cavity 150. In some embodiments, the top surface is the wall surface of the accommodating cavity 150 away from the stator core 130, and the bottom surface is the wall surface of the accommodating cavity 150 on the side close to the stator core 130. Other configurations of the accommodating cavity 150 can be derived based on the various embodiments of this application and will not be described in detail here. With regard to different component forms, in some embodiments, along the circumference of the axis of the sleeve 120, the accommodating cavity 150 can be a continuously extending accommodating cavity 150 or a plurality of discontinuously extending accommodating cavities 150.

[0071] According to a combination of the above embodiments, referring to Figures 1, 2, or 3, in some embodiments, when the insulating bracket 140, sleeve 120, and stator core 130 are installed, the positions of these components can jointly define an accommodating cavity 150. During the process of press-fitting the stator core 130 to the sleeve 120, the two may scrape and generate debris. The scattered debris may enter the gap of the motor, affecting the motor's operation, increasing the motor's failure rate, and increasing the motor's vibration and noise. During the process of the stator core 130 being installed along the axial direction of the sleeve 120 close to the base 110 (pushed from the bottom to the top in FIG1 ), debris will accumulate to a certain extent on the wall surface of the stator core 130 close to the sleeve 120. Thanks to the improvement of the solution of the present application, when the insulating bracket 140, the sleeve 120 and the stator core 130 are all in the installed position, the above three can jointly define the accommodating cavity 150. The wall surface of the stator core 130 on which the debris is accumulated can serve as the bottom surface of the accommodating cavity 150. Therefore, when the stator core 130 is installed and defines the accommodating cavity 150, the debris can be pushed into the accommodating cavity 150 as the stator core 130 moves, so that the accommodating cavity 150 forms a good collection effect for the debris, so that the debris will not move in the gap of the motor as the motor runs. Therefore, the stator assembly 100 of the present application can effectively reduce the impact of debris generated by squeezing and scratching during the assembly of the stator core 130 on the motor, which is beneficial to improving the motor efficiency and reducing motor vibration and noise.

[0072] Specifically, regarding the extension form of the accommodating chamber 150. Referring to Figures 1 to 3, in some embodiments, in order to enable the stator core 130 sleeved on the sleeve 120 to collect more debris, the accommodating chamber 150 may be an annular chamber surrounding the sleeve 120. It can be understood that in this embodiment, the accommodating chamber 150 extends in an annular shape along the circumference of the axis of the sleeve 120, so that the accommodating chamber 150 can extend in a circular shape. In some embodiments, the accommodating chamber 150 can extend around the sleeve 120 along the circumference of the axis of the sleeve 120, and may not form a complete circular ring. When observed along the axial direction of the sleeve 120, the accommodating chamber 150 may be arc-shaped. In some embodiments, the wall surface of the stator core 130 used to define the accommodating chamber 150 may be annular surrounding the sleeve 120. It can be understood that while the accommodating cavity 150 is an annular chamber, the wall surface of the stator core 130 used to define the accommodating cavity 150 can serve as the opening wall surface of the accommodating cavity 150 (the wall surface that pushes debris into the accommodating cavity 150). In order to allow more debris to be pushed into the accommodating cavity 150 as the stator core 130 is installed, the wall surface of the stator core 130 defining the opening of the accommodating cavity 150 can be annular and surround the sleeve 120.

[0073] Referring to FIG. 4 , in other embodiments, the accommodating cavity 150 may be a plurality of discontinuously extending accommodating cavities 150 along the circumferential direction of the axis of the sleeve 120. In this embodiment, the opposing walls of the sleeve 120 or the insulating support 140 may have spaced-apart concave cavities, thereby defining a plurality of discontinuously extending accommodating cavities 150. In some embodiments, the circumferential extension of the wall of the stator core 130 defining the accommodating cavity 150 may be aligned with the extension of the opening of the accommodating cavity 150. In other embodiments, the circumferential extension of the wall of the stator core 130 defining the accommodating cavity 150 may be greater than the extension of the opening of the accommodating cavity 150.

[0074] Referring to FIG. 5 , in some embodiments, the insulating bracket 140 may include an inner circumferential wall 141 disposed around the sleeve 120. It will be appreciated that the inner circumferential wall 141 may be a side wall of the insulating bracket 140 that defines the accommodating cavity 150. The insulating bracket 140 includes a first annular flange 142 disposed on the inner circumferential wall 141 and disposed around the sleeve 120. The first annular flange 142 may abut the outer circumferential wall 121 of the sleeve 120. The outer circumferential wall 121 may be a side wall of the sleeve 120 that defines the accommodating cavity 150. The outer circumferential wall 121 and the inner circumferential wall 141 may be disposed radially opposite each other along the axis of the sleeve 120. The first annular flange 142 may be used to define the accommodating cavity 150. It will be appreciated that, in some embodiments, the first annular flange 142 can serve as a positioning and mounting member for the insulating bracket 140; and its side facing the stator core 130 can also be used to define the accommodating cavity 150. Referring to FIG5 , in some embodiments, the first annular flange 142 can constitute the top surface of the accommodating cavity 150. Along the axial direction of the sleeve 120, the top surface (the wall surface of the accommodating cavity 150 facing the stator core 130) can be arranged opposite the wall surface of the stator core 130 that defines the accommodating cavity 150. In various embodiments, the top surface can be entirely defined by the first annular flange 142 or jointly defined by the first annular flange 142 and the sleeve 120.

[0075] Regarding the arrangement of the first annular flange 142. Referring to Figure 5, in some embodiments, the first annular flange 142 can be located at the end of the inner circumferential wall 141 away from the stator core 130. It can be understood that along the axial direction of the sleeve 120, the end of the insulating bracket 140 close to the stator core 130 can be used to abut or fix the stator core 130, while the end away from the stator core 130 can be provided with the first annular flange 142 and used to define the accommodating cavity 150. The position setting of the above-mentioned first annular flange 142 can make the volume of the accommodating cavity 150 larger, so as to accommodate more debris. In other embodiments, the first annular flange 142 can also be located at the end of the inner circumferential wall 141 close to the stator core 130. 6 , in other embodiments, the first annular flange 142 may also be located between the two ends of the inner circumferential wall 141 along the axial direction of the sleeve 120 (between the end of the inner circumferential wall 141 facing away from the stator core 130 and the end of the inner circumferential wall 141 closer to the stator core 130). It will be appreciated that in this embodiment, the first annular flange 142 may be located in the middle of the inner circumferential wall along a direction parallel to the axis of the sleeve 120.

[0076] In some embodiments, the sleeve 120 may have an outer peripheral wall 121, and the sleeve 120 may include a second annular flange 122 disposed on and surrounding the outer peripheral wall 121. In some embodiments, the second annular flange 122 may cooperate with the first annular flange 142. Specifically, referring to Figures 7-8, to ensure more reliable installation of the insulating bracket 140, the second annular flange 122 may abut the first annular flange 142. Therefore, the second annular flange 122 may abut a wall surface on one side of the first annular flange 142 or form a snap-fit ​​connection with the first annular flange 142.

[0077] As can be seen from the above embodiments, the first annular flange 142 can abut against the second annular flange 122 to serve as a position limiter or fixed connection. Therefore, referring to FIG7 , in some embodiments, the first annular flange 142 can abut against both the second annular flange 122 and the outer peripheral wall 121. Referring to FIG8 , in other embodiments, the first annular flange 142 can abut only against the second annular flange 122, without abutting against the outer peripheral wall 121. It is understood that in this embodiment, the first annular flange 142 and the second annular flange 122 are also provided, and the first annular flange 142 abuts against the second annular flange 122, while the first annular flange 142 does not abut against the outer peripheral wall 121.

[0078] Regarding the arrangement of the second annular flange 122, see FIG7 . In some embodiments, along the axial direction of the sleeve 120, the first annular flange 142 can abut against the side of the second annular flange 122 facing away from the stator core 130. The first annular flange 142 and the second annular flange 122 can abut against each other simply by virtue of their mutual mounting positions; or the two annular flanges can be connected to a fixed structure. In this embodiment, the second annular flange 122 can limit the displacement of the first annular flange 142 along the axial direction of the sleeve 120 toward the stator core 130. In some embodiments, the insulating bracket 140 can also have other positioning members for limiting the displacement of the insulating bracket 140 along the axial direction of the sleeve 120 away from the stator core 130.

[0079] 9 , in other embodiments, along the axial direction of the sleeve 120, the first annular flange 142 may abut against the side of the second annular flange 122 that is closer to the stator core 130. It will be appreciated that the configuration of the first annular flange 142 in this embodiment is similar to that of the previous embodiment, except that the first annular flange 142 is disposed on the other side of the sleeve 120 that is opposite to the second annular flange 122. This configuration can limit the displacement of the first annular flange 142 away from the stator core 130 along the axial direction of the sleeve 120.

[0080] In another embodiment, the second annular flange 122 can be directly connected to the wall of the insulating bracket 140. Specifically, referring to FIG10 , to securely mount the insulating bracket 140, the sleeve 120 can have an outer peripheral wall 121. The sleeve 120 can include a second annular flange 122 disposed on and surrounding the outer peripheral wall 121. In some embodiments, the second annular flange 122 can abut the insulating bracket 140.

[0081] Referring to FIG. 10 , further, in some embodiments, the insulating bracket 140 may have an inner circumferential wall 141 arranged around the sleeve 120. In this embodiment, the second annular flange 122 may abut the inner circumferential wall 141. The second annular flange 122 may be used to define an accommodating cavity 150. It is understood that the second annular flange 122 in this embodiment is similar to the first annular flange 142. The second annular flange 122 may also serve as a positioning and mounting member for the insulating bracket 140, and the side facing the stator core 130 may also be used to define the accommodating cavity 150. In this embodiment, the top surface of the accommodating cavity 150 may be defined by the second annular flange 122. In this embodiment, the second annular flange 122 directly abuts the inner circumferential wall 141 of the insulating bracket 140, and there is no need to separately provide the above-mentioned first annular flange 142 and abut each other.

[0082] The sleeve 120 has an outer circumferential wall 121 and includes a second annular flange 122 disposed on and surrounding the outer circumferential wall 121. Referring to FIG8 , in some embodiments, the second annular flange 122 may have an annular surface 1221 facing away from the base 110. In other words, the annular surface 1221 is located on the side of the second annular flange 122 facing the stator core 130. The diameter of the annular surface 1221 may gradually increase along the direction from the stator core 130 toward the base 110. In other words, the annular surface 1221 may have a tapered slope. The end of the insulating bracket 140 facing away from the stator core 130 may abut the annular surface 1221. Referring to FIG8 , in some embodiments, the diameter of the annular surface 1221 may gradually increase along the direction from the stator core 130 toward the base 110. The end of the insulating bracket 140 facing away from the stator core 130 may abut the annular surface 1221. Referring to FIG. 11 , in other embodiments, the diameter of the annular surface 1221 may gradually decrease along the direction from the stator core 130 toward the base 110, and the end of the insulating support 140 near the stator core 130 may abut the annular surface 1221. It is understood that the conical structure of the annular surface 1221 can further compress the insulating support 140, thereby achieving a tighter fit between the insulating support 140 and the annular surface 1221 (the sleeve 120) and improving the sealing performance of the accommodating cavity 150.

[0083] In embodiments where the insulating bracket 140 includes a first annular flange 142 disposed on the inner circumferential wall 141 and surrounding the sleeve 120, the annular surface 1221 may abut against the first annular flange 142. Referring to FIG8 , the first annular flange 142 may further include a flange surface corresponding to the annular surface 1221. Thus, the flange surface may be located at the end of the first annular flange 142 facing away from the stator core 130. The flange surface may abut against the annular surface 1221, thereby forming a mutually mating abutment structure between the flange surface and the annular surface 1221.

[0084] For embodiments in which the insulating support 140 does not include a flange structure, referring to FIG12 , the annular surface 1221 may directly abut the inner circumferential wall 141 or the end wall of the insulating support 140. Furthermore, the inner circumferential wall 141 or the end wall may also be provided with a side surface that abuts against the annular surface 1221. It will be appreciated that the configuration of the abutting side surface is similar to that of the flange surface described above, except that the abutting side surface is provided on the inner circumferential wall 141. Therefore, the configuration of the abutting side surface can be similar to that of the flange surface described above, and will not be further described here.

[0085] Regarding the different configurations of the first annular flange 142, the first annular flange 142 includes an outer ring and an inner ring relative to the axis of the sleeve 120. It is understood that the inner ring of the first annular flange 142 is the end of the first annular flange 142 radially proximal to the axis of the sleeve 120, and the same applies to the outer ring of the first annular flange 142. In some embodiments, the outer rings of the first annular flange 142 may be staggered relative to the inner ring in a direction parallel to the axis of the sleeve 120. Specifically, referring to Figures 5-9, in some embodiments, the outer ring of the first annular flange 142 may be located on the side of the inner ring facing away from the stator core 130 in a direction parallel to the axis of the sleeve 120. It is understood that in this embodiment, the outer and inner rings of the first annular flange 142 may be inclined, with the outer ring positioned farther away from the stator core 130 than the inner ring. 13 , in other embodiments, the outer ring of the first annular flange 142 may be located on the side of the inner ring facing the stator core 130, along a direction parallel to the axis of the sleeve 120. It will be appreciated that in this embodiment, the outer ring and the inner ring of the first annular flange 142 may be inclined, with the outer ring being closer to the stator core 130 than the inner ring.

[0086] Referring to Figure 14, along the axial direction of the sleeve 120, the sleeve 120 may include a first section 123 connected to the stator core 130 and a second section 124 connected to the insulating bracket 140. The first section 123 and the second section 124 have the same diameter. The first annular flange 142 abuts against the side of the second annular flange 122 facing the stator core 130 to position the relative position of the stator core 130 with respect to the sleeve 120. It can be understood that, in this embodiment, the first annular flange 142 is located at the end of the inner circumferential wall 141 away from the stator core 130, so that the first annular flange 142 can abut against the second annular flange 122 to locate the position of the insulating bracket 140; and the end of the inner circumferential wall 141 of the insulating bracket 140 close to the stator core 130 can abut against the stator core 130 or be provided with a connecting piece for connecting the stator core 130, so the first annular flange 142 and the second annular flange 122 can also jointly locate the relative position of the stator core 130 with respect to the sleeve 120.

[0087] In some embodiments, along the axial direction of the sleeve 120, the sleeve 120 may include a first section 123 connected to the stator core 130 and a second section 124 connected to the insulating bracket 140. To facilitate positioning of the stator core 130 relative to the sleeve 120, a variable diameter structure of the sleeve 120 may be employed to position the stator core 130. Referring to FIG. 15 , in some embodiments, the first section 123 and the second section 124 have different diameters. It is understood that the first section 123 and the second section 124 form a variable diameter structure (also understood as a stepped surface structure) of the sleeve 120. The stator core 130 may abut against the end surface of the first section 123 or the end surface of the second section 124, thereby positioning the stator core 130 with these end surfaces.

[0088] It should be noted that, in different embodiments, the first section 123 may be connected to the second section 124; or the first section 123 and the second section 124 may be disconnected, with another shaft section connected between them. The connection between the first section 123 and the second section 124 may be fixed, detachable, or integrally formed.

[0089] During the installation process of the stator core 130 near the base 110 along the axial direction of the sleeve 120, the wall surface of the stator core 130 near the sleeve 120 and the sleeve 120 form mutual compression and scraping, generating debris. Therefore, the debris easily accumulates on the wall surface of the stator core 130 near the sleeve 120, and may have difficulty in smoothly entering the accommodating cavity 150. In particular, when the sleeve 120 has an axial section with a varying diameter, the debris easily accumulates on the end surface where the diameter changes. Therefore, in order to allow more debris to enter the accommodating cavity 150, in some embodiments, the sleeve 120 or the stator core 130 can be provided with a guide groove 12411. The guide groove 12411 can be connected to the accommodating cavity 150, so that the guide groove 12411 can guide the debris into the accommodating cavity 150. Referring to FIG. 16 or FIG. 17 , for embodiments in which the sleeve 120 includes a first section 123 and a second section 124, and the diameter of the first section 123 is smaller than that of the second section 124, the annular end surface 1241 may be provided with a guide groove 12411, or the first section 123 may be provided with a guide groove 12411, and the guide groove 12411 may be located at one end of the first section 123 proximal to the second section 124. In some embodiments, the guide groove 12411 may be a guide groove with a sloped surface, and the slope of the guide groove 12411 may gradually increase in distance from the axis of the sleeve 120 along the direction from the stator core 130 to the base 110. Referring to FIG. 16 , in some embodiments, the guide groove 12411 may be an annular groove circumferentially surrounding the second section 124. Referring to FIG. 17 , in some embodiments, the guide groove 12411 may be a plurality of discontinuous grooves extending circumferentially along the axis of the sleeve 120. It is understood that because the boundary between the first section 123 and the second section 124 forms a variable diameter structure, the guide groove 12411 provided on the annular end surface 1241 or the first section 123 can facilitate the guidance of debris at the variable diameter location into the accommodating cavity 150. In other embodiments, the guide groove 12411 can also be provided in the stator core 130, near the end of the stator core 130 that contacts the sleeve 120.

[0090] 1 to 18 , an embodiment of the second aspect of the present application further provides an outer rotor motor 200, specifically referring to FIG18 . The outer rotor motor 200 includes the stator assembly 100 in any of the above embodiments, and a rotor assembly 210. The rotor assembly 210 is sleeved on the outside of the stator assembly 100. Thanks to the improvements in the above stator assembly 100, the outer rotor motor 200 of this embodiment has the same technical effects as the above stator assembly 100. At the same time, when debris is generated in the stator assembly 100, the outer rotor motor 200 can promptly process and collect it, thereby reducing the debris that flows from the stator assembly 100 to other components (such as the rotor assembly 210), effectively reducing the impact of the debris on the outer rotor motor 200, and helping to improve the efficiency of the outer rotor motor 200 and reduce vibration and noise.

[0091] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A stator assembly for an outer rotor motor, the stator assembly comprising: Base; A sleeve, one end of which is connected to the base; A stator core is sleeved outside the sleeve; as well as An insulating bracket connected to the end of the stator core facing the base; The insulating bracket, the sleeve and the stator core jointly define a containing cavity.

2. The stator assembly according to claim 1, wherein: The accommodating cavity is an annular chamber surrounding the sleeve.

3. The stator assembly according to claim 1 or 2, wherein: The wall surface of the stator core used to define the accommodating cavity is in a ring shape surrounding the sleeve.

4. The stator assembly according to any one of claims 1 to 3, wherein: The insulating support has an inner circumferential wall arranged around the sleeve, and the insulating support includes a first annular flange provided on the inner circumferential wall and arranged around the sleeve, the first annular flange abuts against the outer circumferential wall of the sleeve, and the first annular flange is used to define the accommodating cavity.

5. The stator assembly of claim 4, wherein: The first annular flange is located at the end of the inner peripheral wall away from the stator core; or, The first annular flange is located at a middle portion of the inner peripheral wall along a direction parallel to the axis of the sleeve.

6. The stator assembly according to claim 4 or 5, wherein: The sleeve includes a second annular flange provided on the outer peripheral wall and arranged around the outer peripheral wall, wherein the second annular flange abuts against the first annular flange.

7. The stator assembly of claim 6, wherein: Along the axial direction of the sleeve, the first annular flange abuts against a side of the second annular flange facing away from the stator core.

8. The stator assembly of claim 7, wherein: Along the axial direction of the sleeve, the sleeve includes a first section connected to the stator core and a second section connected to the insulating bracket, the first section and the second section have the same diameter, and the first annular flange abuts against the side of the second annular flange facing the stator core to locate the relative position of the stator core with respect to the sleeve.

9. The stator assembly according to any one of claims 4 to 8, wherein: Along a direction parallel to the axis of the sleeve, the outer ring of the first annular flange is located on a side of the inner ring away from the stator core; or Along a direction parallel to the axis of the sleeve, the outer ring of the first annular flange is located on a side of the inner ring facing the stator core.

10. The stator assembly according to any one of claims 1 to 9, wherein: The insulating bracket has an inner circumferential wall arranged around the sleeve, the insulating bracket includes a first annular flange arranged on the inner circumferential wall and around the sleeve, the sleeve includes a second annular flange arranged on the outer circumferential wall and around the outer circumferential wall, the first annular flange abuts against the second annular flange, and the first annular flange is used to define the accommodating cavity.

11. The stator assembly according to any one of claims 1 to 10, wherein: Along the axial direction of the sleeve, the sleeve includes a first section connected to the stator core and a second section connected to the insulating bracket, the diameter of the first section is smaller than the diameter of the second section, the second section has an annular end surface arranged around the first section, and the end surface of the stator core facing the base abuts against the annular end surface.

12. The stator assembly of claim 11, wherein: The annular end surface is provided with a guide groove, and the guide groove is communicated with the accommodating cavity.

13. The stator assembly according to any one of claims 1 to 12, wherein: The sleeve has an outer peripheral wall, and the sleeve includes a second annular flange which is arranged on the outer peripheral wall and surrounds the outer peripheral wall, the second annular flange abuts against the insulating bracket, and the second annular flange is used to define the accommodating cavity.

14. The stator assembly of claim 13, wherein: The insulating support has an inner circumferential wall arranged around the sleeve, and the second annular flange abuts against the inner circumferential wall.

15. The stator assembly according to any one of claims 1 to 14, wherein: The sleeve has an outer peripheral wall, and the sleeve includes a second annular flange provided on the outer peripheral wall and arranged around the outer peripheral wall, the second annular flange has an annular surface facing away from the base, and the diameter of the annular surface gradually increases along the direction from the stator core to the base, and the end of the insulating bracket facing away from the stator core abuts against the annular surface.

16. An outer rotor motor, comprising: The stator assembly according to any one of claims 1 to 15; as well as A rotor assembly is sleeved on the outside of the stator assembly.

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