Stator assembly and external rotor motor

Abstract

The application discloses a kind of stator assembly and outer rotor motor, stator assembly includes base, sleeve, stator core and insulation support.Sleeve one end is connected to base;Stator core is sleeved in sleeve outside;Insulation support is connected to the end of stator core facing base;Wherein, insulation support, sleeve and stator core jointly define accommodating cavity.In the stator core installation and define accommodating cavity at the same time, debris can be pushed into accommodating cavity along with the movement of stator core.Therefore, the stator assembly of the present application can effectively reduce the influence of debris on the motor due to extrusion scratch during stator core assembly, which is beneficial to improve motor efficiency, reduce motor vibration and noise.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a stator assembly and an outer rotor motor. Background Art

[0002] 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.

[0003] 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

[0004] The main purpose of the present invention is to propose a stator assembly and an outer rotor motor, which can effectively reduce the impact of debris generated by extrusion and scratching during the assembly of the stator core on the motor, which is beneficial to improving the motor efficiency and reducing motor vibration and noise.

[0005] To achieve the above objectives, a first embodiment of the present invention provides a stator assembly for an outer rotor motor, the stator assembly comprising:

[0006] base;

[0007] a sleeve, one end of which is connected to the base;

[0008] a stator core, sleeved outside the sleeve; and

[0009] an insulating bracket connected to the end of the stator core facing the base;

[0010] The insulating bracket, the sleeve and the stator core jointly define an accommodating cavity.

[0011] In some embodiments, the accommodating cavity is an annular chamber surrounding the sleeve.

[0012] In some embodiments, the wall of the stator core used to define the accommodating cavity is in a ring shape surrounding the sleeve.

[0013] 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.

[0014] In some embodiments, the first annular flange is located at an end of the inner circumferential wall away from the stator core; or, the first annular flange is located at a middle portion of the inner circumferential wall in a direction parallel to the axis of the sleeve.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[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 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.

[0021] In some embodiments, the annular end surface is provided with a guide groove, and the guide groove is communicated with the accommodating cavity.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] An embodiment of the second aspect of the present invention further provides an outer rotor motor, comprising:

[0026] The stator assembly of any of the above; and

[0027] The rotor assembly is sleeved on the outside of the stator assembly.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the technical solution of the present invention, when the insulating bracket, sleeve and stator core are installed, the positions of the above components can jointly define a storage cavity. During the process of press-fitting the stator core to the sleeve, the outer ring of the sleeve will be squeezed and scratched by the stator core, and some debris will be scattered. The debris may enter the motor gap, affecting the motor operation state, and causing the motor failure rate to increase and the motor vibration noise to increase. During the process of the stator core being installed along the axial direction of the sleeve close to the base, debris will accumulate to a certain extent on the wall of the stator core close to the sleeve. Thanks to the improvement of the solution of the present invention, when the insulating bracket, sleeve and stator core are all in the installed position, the above three can jointly define the storage cavity. The wall of the stator core with accumulated debris can serve as the bottom surface of the storage cavity. Therefore, when the stator core is installed and the storage cavity is defined, the debris can be pushed into the storage cavity as the stator core moves, so that the storage cavity 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 of the present invention can effectively reduce the impact of debris generated by extrusion and scratching during the assembly of the stator core on the motor, which is beneficial to improving the efficiency of the motor and reducing motor vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 A side cross-sectional schematic diagram of a stator assembly provided in a first embodiment of the present invention;

[0032] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0033] Figure 3 A perspective schematic diagram of a base and a sleeve provided in a second embodiment of the present invention;

[0034] Figure 4 This is a second side schematic diagram of the assembly of the base, sleeve, and insulating bracket provided in the third embodiment of the present invention;

[0035] Figure 5 A partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the fourth embodiment of the present invention;

[0036] Figure 6 A partially enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the fifth embodiment of the present invention;

[0037] Figure 7 A partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in the sixth embodiment of the present invention;

[0038] Figure 8 A partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the seventh embodiment of the present invention;

[0039] Figure 9 A partial enlarged schematic diagram of the accommodation cavity of the stator assembly provided in the eighth embodiment of the present invention;

[0040] Figure 10 A partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the ninth embodiment of the present invention;

[0041] Figure 11 A partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the tenth embodiment of the present invention;

[0042] Figure 12 A partially enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the eleventh embodiment of the present invention;

[0043] Figure 13 A partial enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the twelfth embodiment of the present invention;

[0044] Figure 14 This is a partially enlarged schematic diagram of the accommodating cavity of the stator assembly provided in the thirteenth embodiment of the present invention; wherein the dotted line represents the boundary between the first section and the second section;

[0045] Figure 15Fig. 14 is a partial enlarged view of the accommodating cavity of the stator assembly according to the fourteenth embodiment of the present application, wherein the dashed line indicates the boundary between the first section and the second section;

[0046] Figure 16 Fig. 15 is a partial enlarged view of the accommodating cavity of the stator assembly according to the fifteenth embodiment of the present application, wherein the dashed line indicates the boundary between the first section and the second section;

[0047] Figure 17 Fig. 16 is a partial enlarged view of the accommodating cavity of the stator assembly according to the sixteenth embodiment of the present application, wherein the dashed line indicates the boundary between the first section and the second section;

[0048] Figure 18 Fig. 17 is a side view of the outer rotor motor according to the second embodiment of the present application.

[0049] LIST OF ELEMENTS IN DRAWINGS

[0050] 100 - stator assembly;

[0051] 110 - base;

[0052] 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;

[0053] 130 - stator core;

[0054] 140 - insulating support; 141 - inner peripheral wall; 142 - first annular flange;

[0055] 150 - accommodating cavity;

[0056] 200 - outer rotor motor; 210 - rotor assembly.

[0057] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0059] It should be noted that if the embodiments of the present invention 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.

[0060] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, 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 it. 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 the present invention.

[0061] 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.

[0062] In view of this, see Figures 1-17 The embodiment of the first aspect of the present invention 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.

[0063] See also Figure 1-Figure 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 the bearing.

[0064] See also Figure 1-Figure 2 One end of the sleeve 120 is connected to the base 110. In different embodiments, the connection between the sleeve 120 and the base 110 can be a fixed connection, a detachable connection, or the sleeve 120 can be integrally formed with the base 110. In some embodiments, the sleeve 120 can have a through hole extending along its axial direction.

[0065] See also Figure 1-Figure 2 , the stator core 130 is sleeved outside the sleeve 120. It is understandable 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 is sleeved in the sleeve 120, and each outer core unit is 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, and the details can be referred to the prior art, which will not be repeated here.

[0066] 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.

[0067] See also Figure 1-Figure 2 The insulating bracket 140 is connected to the end of the stator core 130 facing the base 110. The insulating bracket 140 primarily serves to isolate the core from the coil windings. After the insulating bracket 140 is connected to the stator, the coils can be wound around the insulating bracket 140. After the coils are wound, they can be tied together to form the finished stator assembly 100.

[0068] 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.

[0069] See also Figure 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 may jointly define the bottom surface of the accommodating cavity 150 with the insulating bracket 140. 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 according to various embodiments of the present invention and will not be described in detail here. With regard to different component forms, in some embodiments, the accommodating cavity 150 can be a continuously extending accommodating cavity 150 along the circumference of the axis of the sleeve 120, or it can be a plurality of discontinuously extending accommodating cavities 150.

[0070] According to the combination of the above embodiments, see Figure 1 、 Figure 2 or Figure 3In some embodiments, when the insulating bracket 140, the sleeve 120 and the stator core 130 are installed, the positions of the above components can jointly define the accommodating cavity 150. During the process of press-fitting the stator core 130 to the sleeve 120, the scraping between the two will generate debris, and the scattered debris may enter the gap of the motor, affecting the running state of the motor, and causing the motor failure rate to increase and the motor vibration noise to increase. During the process of the stator core 130 approaching the base 110 along the axial direction of the sleeve 120 and being installed (in Figure 1 In the figure, the direction of pushing from the bottom to the top is shown), debris will accumulate to a certain extent on the wall of the stator core 130 close to the sleeve 120. Thanks to the improvement of the solution of the present invention, 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 of the stator core 130 with accumulated debris can be used 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 invention 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 efficiency of the motor and reducing the vibration and noise of the motor.

[0071] Specifically, for the extension form of the accommodating cavity 150. Figure 1-Figure 3 In some embodiments, in order to enable the stator core 130 sleeved in the sleeve 120 to collect more debris, the accommodating cavity 150 may be an annular chamber surrounding the sleeve 120. It will be understood that in this embodiment, the accommodating cavity 150 extends in an annular shape along the circumference of the axis of the sleeve 120, so that the accommodating cavity 150 may extend in a circular shape. In some embodiments, the accommodating cavity 150 may extend around the sleeve 120 along the circumference of the axis of the sleeve 120 and may not form a complete annular ring. When viewed along the axial direction of the sleeve 120, the accommodating cavity 150 may be arc-shaped. In some embodiments, the wall surface of the stator core 130 used to define the accommodating cavity 150 may be annular and surround the sleeve 120. It can be understood that while the accommodating cavity 150 is an annular chamber, the wall of the stator core 130 used to define the accommodating cavity 150 can serve as the opening wall of the accommodating cavity 150 (the wall 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 of the stator core 130 that defines the opening of the accommodating cavity 150 can be annular and surround the sleeve 120.

[0072] See also Figure 4In some embodiments, the stator core 130 can be arranged to define a plurality of accommodating cavities 150 in the sleeve 120. In some embodiments, the stator core 130 can be arranged to define a plurality of accommodating cavities 150 in the sleeve 120 along the circumferential direction of the sleeve 120. In some embodiments, the stator core 130 can be arranged to define a plurality of accommodating cavities 150 in the sleeve 120 along the circumferential direction of the sleeve 120, and the plurality of accommodating cavities 150 can be arranged to be continuous along the circumferential direction of the sleeve 120. In some embodiments, the stator core 130 can be arranged to define a plurality of accommodating cavities 150 in the sleeve 120 along the circumferential direction of the sleeve 120, and the plurality of accommodating cavities 150 can be arranged to be discontinuous along the circumferential direction of the sleeve 120.

[0073] Referring to Figure 5 In some embodiments, the insulating support 140 can have an inner circumferential wall 141 arranged to surround the sleeve 120. It can be understood that the inner circumferential wall 141 can be a side wall of the insulating support 140 for defining the accommodating cavities 150. The insulating support 140 comprises a first annular flange 142 arranged to surround the sleeve 120 and disposed on the inner circumferential wall 141. The first annular flange 142 can abut against the outer circumferential wall 121 of the sleeve 120, which can be a side wall of the sleeve 120 for defining the accommodating cavities 150, and the outer circumferential wall 121 and the inner circumferential wall 141 can be arranged to be opposite to each other along the radial direction of the sleeve 120. The first annular flange 142 can be used to define the accommodating cavities 150. It can be understood that, in some embodiments, the first annular flange 142 can be used as a positioning and mounting member of the insulating support 140 on one hand, and on the other hand, the side of the first annular flange 142 facing the stator core 130 can also be used to define the accommodating cavities 150, referring to Figure 5 In some embodiments, the first annular flange 142 can constitute a top surface of the accommodating cavities 150, which can be arranged to be opposite to the wall of the stator core 130 for defining the accommodating cavities 150 along the axial direction of the sleeve 120. In different embodiments, the top surface can be defined by the first annular flange 142 alone, or by the first annular flange 142 and the sleeve 120 together.

[0074] For the arrangement of the first annular flange 142. Referring to Figure 5In 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 a 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 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. See Figure 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 close to the stator core 130). It will be understood 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.

[0075] 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. Figure 7-Figure 8 In order to make the installation of the insulating bracket 140 more reliable, the second annular flange 122 can abut the first annular flange 142. Therefore, the second annular flange 122 can abut the wall surface of one side of the first annular flange 142 or form a snap connection with the first annular flange 142.

[0076] As can be seen from the above embodiment, the first annular flange 142 can abut against the second annular flange 122 to play a role of limiting or fixing the connection. Figure 7 In some embodiments, the first annular flange 142 can abut against the second annular flange 122 and the outer peripheral wall 121 at the same time. Figure 8 In other embodiments, the first annular flange 142 may only abut against the second annular flange 122, but not against the outer peripheral wall 121. It is understandable 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, and the first annular flange 142 does not abut against the outer peripheral wall 121.

[0077] For the configuration of the second annular flange 122, see Figure 7In 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 may further 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.

[0078] See also Figure 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 close to the stator core 130. It is understood 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 provided 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.

[0079] In another embodiment, the second annular flange 122 can be directly connected to the wall of the insulating bracket 140. Figure 10 To securely mount the insulating bracket 140 , 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 abut against the insulating bracket 140 .

[0080] See also Figure 10 Furthermore, 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 the accommodating cavity 150. It can be understood that the second annular flange 122 in this embodiment is similar to the first annular flange 142. The second annular flange 122 can also serve as a positioning and mounting member of the insulating bracket 140, and the side facing the stator core 130 can also be used to define the accommodating cavity 150. In this embodiment, the top surface of the accommodating cavity 150 can 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.

[0081] The sleeve 120 has an outer peripheral wall 121, and the sleeve 120 includes a second annular flange 122 disposed on and around the outer peripheral wall 121. Figure 8 In some embodiments, the second annular flange 122 may have an annular surface 1221 facing away from the base 110. That is, 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 to the base 110. That is, the annular surface 1221 may have a conical slope structure. The end of the insulating bracket 140 facing away from the stator core 130 may abut the annular surface 1221. Figure 8 In some embodiments, the diameter of the annular surface 1221 may gradually increase along the direction from the stator core 130 to the base 110, and the end of the insulating bracket 140 away from the stator core 130 may abut the annular surface 1221. Figure 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 bracket 140 near the stator core 130 may abut the annular surface 1221. It is understood that the annular surface 1221 can further press the insulating bracket 140 through the conical surface structure, thereby making the fit between the insulating bracket 140 and the annular surface 1221 (sleeve 120) tighter and improving the sealing performance of the accommodating cavity 150.

[0082] For the embodiment in which the insulating support 140 includes a first annular flange 142 provided on the inner peripheral wall 141 and arranged around the sleeve 120, the annular surface 1221 can abut against the first annular flange 142. Figure 8 Furthermore, the first annular flange 142 may further include a flange surface corresponding to the annular surface 1221. Therefore, 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 an abutting structure in which the flange surface and the annular surface 1221 cooperate with each other.

[0083] For embodiments where the insulating support 140 does not include a flange structure, see Figure 12 The annular surface 1221 can directly abut against the inner circumferential wall 141 or the end wall of the insulating bracket 140. Furthermore, the inner circumferential wall 141 or the end wall can also be provided with a side surface corresponding to the annular surface 1221. It is understood that the configuration of the abutting side surface is similar to the above-mentioned flange surface, except that the abutting side surface is provided on the inner circumferential wall 141. Therefore, the configuration of the abutting side surface can refer to the above-mentioned flange surface and will not be repeated here.

[0084] Regarding different configurations of the first annular flange 142. The first annular flange 142 has an outer ring and an inner ring relative to the axis of the sleeve 120. It can be understood that the inner ring of the first annular flange 142 is the end of the first annular flange 142 radially close to the axis of the sleeve 120 along 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 ring of the first annular flange 142 can be staggered relative to the inner ring in a direction parallel to the axis of the sleeve 120. For details, see Figure 5-9 In some embodiments, along a direction parallel to the axis of the sleeve 120, the outer ring of the first annular flange 142 may be located on a side of the inner ring away from the stator core 130. It is understood that in this embodiment, the outer ring and the inner ring of the first annular flange 142 may be inclined, and the outer ring is farther away from the stator core 130 than the inner ring. Figure 13 In other embodiments, along a direction parallel to the axis of the sleeve 120, the outer ring of the first annular flange 142 may be located on the side of the inner ring facing the stator core 130. It will be understood that in this embodiment, the outer ring and the inner ring of the first annular flange 142 may be inclined, and the outer ring is closer to the stator core 130 than the inner ring.

[0085] See also 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 relative 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.

[0086] 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. In order to facilitate the positioning of the stator core 130 relative to the sleeve 120, the sleeve 120 may be positioned by using a variable diameter structure. Figure 15In some embodiments, the diameters of the first section 123 and the second section 124 are different. It is understood that the first section 123 and the second section 124 form a diameter-varying structure (also understood as a stepped surface structure) of the sleeve 120 . The stator core 130 can 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.

[0087] 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.

[0088] During the process of the stator core 130 being installed 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, thereby generating debris. Therefore, the debris is likely to accumulate 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 is likely to accumulate on the end surface where the diameter varies. Therefore, in order to allow more debris to enter the accommodating cavity 150, in some embodiments, the sleeve 120 or the stator core 130 may be provided with a guide groove 12411. The guide groove 12411 may be connected to the accommodating cavity 150, so that the guide groove 12411 can guide the debris into the accommodating cavity 150. See Figure 16 or Figure 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 provided at one end of the first section 123 near the second section 124. In some embodiments, the guide groove 12411 may be a guide groove and have a sloped surface. In the direction from the stator core 130 to the base 110, the distance between the slope of the guide groove 12411 and the axis of the sleeve 120 may gradually increase. Figure 16 In some embodiments, the guide groove 12411 may be an annular groove surrounding the second section 124. Figure 17In some embodiments, the guide groove 12411 may also be a discontinuous groove extending in multiple sections along the circumference of the sleeve 120 axis. 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 directing debris at the variable diameter location into the accommodating cavity 150. In other embodiments, the guide groove 12411 may also be provided on the stator core 130, near the end of the stator core 130 that contacts the sleeve 120.

[0089] See also Figures 1-18 The embodiment of the second aspect of the present invention further provides an outer rotor motor 200, see Figure 18 The outer rotor motor 200 includes the stator assembly 100 of 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 improvement of 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), and can effectively reduce the impact of the debris on the outer rotor motor 200, which is beneficial to improving the efficiency of the outer rotor motor 200 and reducing vibration and noise.

[0090] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A stator assembly for an outer rotor motor, characterized in that: The stator assembly comprises: base; a sleeve, one end of which is connected to the base; a stator core, sleeved outside the sleeve; and an insulating bracket connected to the end of the stator core facing the base; Wherein, the insulating bracket, the sleeve and the stator core jointly define an accommodating cavity; 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.

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, 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 claim 1, 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.

5. The stator assembly according to claim 1, 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.

6. The stator assembly according to claim 5, 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.

7. The stator assembly according to claim 6, 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. 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.

8. The stator assembly according to claim 1, 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 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.

9. The stator assembly according to claim 1, 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 abuts against the insulating bracket, and the second annular flange is used to define the accommodating cavity.

10. The stator assembly according to claim 9, wherein: The insulating bracket has an inner circumferential wall arranged around the sleeve, and the second annular flange abuts against the inner circumferential wall.

11. A stator assembly for an outer rotor motor, characterized in that: The stator assembly comprises: base; a sleeve, one end of which is connected to the base; a stator core, sleeved outside the sleeve; and an insulating bracket connected to the end of the stator core facing the base; Wherein, the insulating bracket, the sleeve and the stator core jointly define an accommodating cavity; 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 of the sleeve 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.

12. The stator assembly according to claim 1 or 11, characterized in that 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.

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

14. The stator assembly according to claim 1 or 11, characterized in that The sleeve has an outer peripheral wall, and includes a second annular flange provided on and surrounding 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. The end of the insulating bracket facing away from the stator core abuts against the annular surface.

15. An outer rotor motor, characterized in that: include: The stator assembly according to any one of claims 1 to 14; as well as The rotor assembly is sleeved on the outside of the stator assembly.

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