CN115347735A - External rotor motor and air conditioner - Google Patents

Abstract

The invention discloses an outer rotor motor and an air conditioner. The outer rotor motor comprises an outer rotor component, a stator component and an annular wind wheel, the outer rotor component is rotatably sleeved on the stator component, an air outlet is formed between one end of the outer rotor component, facing the stator component, and the stator component, the wind wheel is located at the air outlet and fixedly sleeved on the outer rotor component, an air inlet is formed in one end of the outer rotor component, facing away from the stator component, an air passing channel is formed in a space defined by the outer rotor component and the stator component, and the air inlet and the air outlet are communicated through the air passing channel. The outer rotor assembly rotates together with the wind wheel when rotating, high-temperature air in the air passing channel is blown out from the air outlet under the action of the wind wheel, external normal-temperature air is fed into the air passing channel from the air inlet and exchanges heat in the air passing channel, the outer rotor motor is cooled through heat dissipation in an internal and external air circulation mode, and the outer rotor motor is better in heat dissipation performance and longer in service life.

Description

External rotor motor and air conditioner

Technical Field

The invention relates to the field of electrical equipment, in particular to an outer rotor motor and an air conditioner.

Background

The outer rotor motor has the advantages of space saving, compact design, low noise, high operation efficiency, attractive appearance and the like, and is widely applied to various fields including the field of fans, the field of induction cookers, the field of electric vehicles and the like. However, the existing external rotor motor has poor heat dissipation performance, and the external rotor motor has high temperature in a running state, which directly affects the performance and the service life of the external rotor motor, which is also a main reason that the performance of the current external rotor motor is poor and the service life of the current external rotor motor is not long.

Disclosure of Invention

The invention mainly aims to provide an outer rotor motor which is better in heat dissipation performance.

The invention also provides an air conditioner.

In order to achieve the above object, the external rotor motor according to an embodiment of the present invention includes an external rotor assembly, a stator assembly, and an annular wind wheel, wherein the external rotor assembly is rotatably sleeved on the stator assembly, an air outlet is formed between one end of the external rotor assembly facing the stator assembly and the stator assembly, the wind wheel is located at the air outlet, the wind wheel is fixedly sleeved on the external rotor assembly, an air inlet is disposed at one end of the external rotor assembly facing away from the stator assembly, an air passage is disposed in a space enclosed by the external rotor assembly and the stator assembly, and the air inlet and the air outlet are communicated through the air passage.

In an exemplary embodiment, the outer rotor assembly includes a first top wall and a first peripheral wall connected to the first top wall, the stator assembly includes a first bottom wall and a second peripheral wall connected to the first bottom wall, an open end of the first peripheral wall extends into the second peripheral wall, the open end of the first peripheral wall is spaced from the first bottom wall, an annular air outlet is formed between the first peripheral wall and the second peripheral wall, the wind wheel is located in the air outlet, and the air inlet is located in the first top wall.

In an exemplary embodiment, the stator assembly further includes a circuit board, the circuit board is located between the first peripheral wall and the first bottom wall, the circuit board is parallel to the first bottom wall, the open end of the first peripheral wall is spaced from the circuit board, and the air passage is located in an area surrounded by the first top wall, the circuit board and the first peripheral wall.

In an exemplary embodiment, the circuit board comprises a board body and an electronic component, the electronic component is arranged on one side of the board body, which faces the first bottom wall, and the electronic component is sealed through a glue filling layer.

In an exemplary embodiment, the potting adhesive layer fills the area between the plate body, the first bottom wall and the second peripheral wall, and an edge of the potting adhesive layer facing the first top wall is at most flush with a side of the plate body facing the first top wall.

In an exemplary embodiment, the stator assembly further comprises: the circuit board is positioned between the stator winding and the first bottom wall, and is sleeved on the base; and a bracket including the first bottom wall and the second peripheral wall, the base being mounted within the bracket.

In an exemplary embodiment, the base is provided with a second bearing cavity with an opening facing the first bottom wall, a second bearing is installed in the second bearing cavity, the first top wall is provided with a fixing hole, a rotating shaft is fixed in the fixing hole, one end of the rotating shaft extends into the second bearing cavity, the second bearing is sleeved on the rotating shaft, and the first bottom wall closes the opening end of the second bearing cavity.

In an exemplary embodiment, the base is further provided with a first bearing cavity with an opening facing the first top wall, a first bearing is installed in the first bearing cavity, and the first bearing is sleeved on the rotating shaft.

In an exemplary embodiment, the radial distance between the rotor and the second circumferential wall is not more than 1mm.

In an exemplary embodiment, the wind wheel is a metal or plastic piece.

In an exemplary embodiment, the wind wheel is fixedly bonded or clamped or fixedly sleeved on the outer rotor assembly through screw locking.

The air conditioner provided by the embodiment of the invention comprises the outer rotor motor in any one of the embodiments.

According to the technical scheme, the outer rotor component rotates with the wind wheel, high-temperature air in the air passing channel is blown out from the air outlet under the action of the wind wheel, outside normal-temperature air is fed into the air passing channel from the air inlet and exchanges heat in the air passing channel, the outer rotor motor is cooled through heat dissipation in an internal and external air circulation mode, the heat dissipation performance of the outer rotor motor is better, and the service life of the outer rotor motor is longer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an outer rotor motor according to a first embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure view of the external rotor motor shown in fig. 1;

FIG. 3 is an enlarged view of part A of FIG. 2, with arrows indicating the direction of air flow;

fig. 4 is an exploded view of the outer rotor motor shown in fig. 1;

FIG. 5 is a schematic cross-sectional view of the structure of FIG. 1 showing the mating structure of the housing and the shaft;

FIG. 6 is a perspective view of the bracket of FIG. 1;

fig. 7 to 11 are structural diagrams illustrating an assembly sequence of the external rotor motor shown in fig. 1.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 11 is:

the wind-driven generator comprises a 100 outer rotor component, a 110 shell, a 111 first top wall, a 112 first peripheral wall, a 120 rotating shaft, a 200 stator component, a 210 support, a 211 first bottom wall, a 212 second peripheral wall, a 213 positioning groove, a 220 circuit board, a 230 glue-pouring layer, a 240 base, a 241 stator winding, a 242 second bearing cavity, a 243 first bearing cavity, a 250 second bearing, a 260 first bearing, a 300 wind wheel, a 410 wind outlet, a 420 wind inlet and a 430 wind passing channel.

The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example one

Fig. 1 is a schematic perspective view of an outer rotor motor according to a first embodiment of the present invention. Fig. 2 is a schematic sectional view of the external rotor motor shown in fig. 1. Fig. 3 is an enlarged view of a portion a of fig. 2, and arrows indicate the air flow direction. Fig. 4 is an exploded view of the external rotor motor shown in fig. 1. Fig. 5 is a schematic cross-sectional view of the mating structure of the housing and the rotating shaft in fig. 1. Fig. 6 is a perspective view of the stent shown in fig. 1. Fig. 7 to 11 show an assembly sequence of the outer rotor motor.

The related technology provides an external rotor motor, the external rotor is located on the front side of a controller shell, the external rotor is assembled with the controller shell, one side of the external rotor, facing the controller shell, is provided with first cooling fins, a motor cooling cavity is formed between adjacent first cooling fins, one side of the controller shell, facing the external rotor, is provided with second cooling fins, a controller cooling cavity is formed between adjacent second cooling fins, the motor cooling cavity is located on the front side of the controller cooling cavity, when the external rotor rotates, external normal temperature air enters the motor cooling cavity along the radial direction inwards, then reaches the controller cooling cavity along the axial direction, and then is blown out along the radial direction outwards. The external air of whole process is realized cooling to the outer rotor through taking away the heat that the outer rotor transmitted to the chamber wall in motor heat dissipation chamber, and the radiating effect of outer rotor is not fine.

As shown in fig. 1 to 11, an outer rotor motor according to an embodiment of the present invention includes: an outer rotor assembly 100; the stator assembly 200 is positioned behind the outer rotor assembly 100, the outer rotor assembly 100 is rotatably sleeved on the stator assembly 200, and one end of the outer rotor assembly 100 facing the stator assembly 200 (namely, the rear end of the outer rotor assembly 100) is arranged to form an air outlet 410 together with the stator assembly 200 for heat dissipation; the wind wheel 300 is arranged at the air outlet 410, and the wind wheel 300 is fixedly sleeved on the outer rotor assembly 100; furthermore, an air inlet 420 for allowing air at normal temperature to enter is disposed at one end of the outer rotor assembly 100 (i.e., the front end of the outer rotor assembly 100) facing away from the stator assembly 200, an air passage 430 for performing heat exchange is disposed in an internal space enclosed by the outer rotor assembly 100 and the stator assembly 200, the air passage 430 is configured to communicate the air inlet 420 and the air outlet 410, i.e., the front end of the air passage 430 is communicated with the air inlet 420, and the rear end of the air passage 430 is communicated with the air outlet 410.

According to the outer rotor motor, the outer rotor assembly 100 rotates together with the wind wheel 300, under the action of the wind wheel 300, high-temperature air in the air passing channel 430 is blown out from the air outlet 410, external normal-temperature air is supplemented into the air passing channel 430 from the air inlet 420 and exchanges heat in the air passing channel 430, the outer rotor motor is cooled through heat dissipation in an internal and external air circulation mode, the heat dissipation performance of the outer rotor motor is better, and the service life of the outer rotor motor is longer.

Optionally, the wind wheel 300 is made of a plastic material (for example, the wind wheel 300 is a plastic piece), and the cost of the manufactured wind wheel 300 made of the plastic material is lower; or the wind wheel 300 is made of metal (for example, the wind wheel 300 is a metal piece), and although the cost of the made metal wind wheel is increased, the strength is better, and the service life is longer; the above objectives can be achieved without departing from the design concept of the present invention, and therefore, the details are not repeated herein and all of the objectives should fall within the protection scope of the present application.

Moreover, the wind wheel 300 can be fixedly sleeved on the outer side surface of the outer rotor assembly 100 in an adhering (i.e., bonding) manner, the wind wheel can also be fixedly sleeved on the outer side surface of the outer rotor assembly 100 in a clamping manner, and the wind wheel can also be fixedly sleeved on the outer side surface of the outer rotor assembly 100 in a screw locking manner, so that the purpose of the application can be achieved.

In order to better ensure the heat dissipation performance of the outer rotor motor, as shown in fig. 2 to 5, the air passage 430 is configured as a cylindrical or annular structure, the air inlet 420 includes a plurality of air inlets 420, and the plurality of air inlets 420 are uniformly distributed in the circumferential direction, the air outlet 410 may be configured as an annular opening, the air outlet 410 may also be configured as a plurality of circular holes uniformly distributed in the circumferential direction, and the plurality of circular holes may be two, three, four or five, etc.; the objectives of the present application can be achieved without departing from the design concept of the present invention, and therefore, the present application shall not be repeated herein and shall fall within the protection scope of the present application.

In an exemplary embodiment, as shown in fig. 2 and 5, the outer rotor assembly 100 includes a first top wall 111 at the front side and a first peripheral wall 112 at the rear side, a periphery of the first top wall 111 is connected to a front edge of the first peripheral wall 112, the stator assembly 200 may be configured to include a second peripheral wall 212 at the front side and a first bottom wall 211 at the rear side, a periphery of the first bottom wall 211 is connected to a rear edge of the second peripheral wall 212, an open end (i.e., a rear end) of the first peripheral wall 112 is configured to extend backward into an interior of the second peripheral wall 212 from an open end (i.e., a front end) of the second peripheral wall 212, the first bottom wall 211 is axially spaced from the open end of the first peripheral wall 112, and the second peripheral wall 212 is radially spaced from the first peripheral wall 112, so that an annular air outlet 410 is formed between the second peripheral wall 212 and the first peripheral wall 112, and the air outlet 410 is blown forward. The wind wheel 300 sinks into the air outlet 410 and is fixedly sleeved on the outer side face of the opening end (rear end) of the first circumferential wall 112, and under the action of the wind wheel 300, high-temperature air in the air passing channel 430 can be blown to the outside from the air outlet 410 more smoothly, so that heat dissipation and cooling are performed on the inside of the outer rotor motor. The intake vent 420 may be disposed on the first top wall 111, so as to better ensure that the air entering from the intake vent 420 is normal temperature air. Of course, the air inlet 420 may also be disposed at one end of the first peripheral wall 112 adjacent to the first top wall 111 (i.e., the front end of the first peripheral wall 112); the intake vent 420 may also be disposed on both the first top wall 111 and an end of the first peripheral wall 112 adjacent to the first top wall 111 (i.e., a front end of the first peripheral wall 112); the above objectives can be achieved without departing from the design concept of the present invention, and therefore, the details are not repeated herein and all of the objectives should fall within the protection scope of the present application.

In an exemplary embodiment, as shown in fig. 2 and 3, the stator assembly 200 further includes a circuit board 220, the circuit board 220 is disposed inside the second peripheral wall 212 and between the first peripheral wall 112 and the first bottom wall 211, and the board surface is perpendicular to the front-back direction and transverse to the front-back direction, and the circuit board 220 is spaced from the open end of the first peripheral wall 112 to communicate with the air outlet 410 and the air passage 430. The air passing channel 430 is located between the first top wall 111, the circuit board 220 and the first peripheral wall 112, and when the outer rotor assembly 100 rotates, the circuit board 220 is also cooled by heat dissipation, so that the performance of the circuit board 220 can be better ensured; in addition, the circuit board 220 is hidden inside the outer rotor motor, and is not easy to be affected with damp and bump, so that the use reliability of the outer rotor motor is better.

The circuit board 220 may be an integral structure; alternatively, the circuit board 220 may be a split structure including a plurality of sub-circuit boards, and the plurality may be two, three, or four, etc.; the objectives of the present application can be achieved without departing from the design concept of the present invention, and therefore, the present application shall not be repeated herein and shall fall within the protection scope of the present application.

Illustratively, as shown in fig. 2 to 4 and 7 to 11, the circuit board 220 is configured to include a board body and an electronic component disposed on the board body, the electronic component is disposed on one side of the board body facing the first bottom wall 211 (i.e., the rear side of the board body), and is protected by a potting layer 230 formed by injecting potting resin, so as to prevent the electronic component from being damaged by collision or damp during transportation and use.

For example, as shown in fig. 2, 9 and 10, the injected potting resin fills the area enclosed among the board body, the first bottom wall 211 and the second peripheral wall 212 to form an annular potting layer 230, and the outer diameter of the potting layer 230 is set to be larger than the diameter of the board body, so that the board body is embedded in the side of the potting layer 230 facing the first top wall 111 (the front side of the potting layer 230), and the periphery of the potting layer 230 does not protrude forward from the side of the board body facing the first top wall 111 relative to the exposed area of the board body in the circumferential direction, which can better improve the heat dissipation performance of the circuit board 220.

For example, as shown in fig. 1, 4, and 7 to 11, the stator assembly 200 is further provided to include: the circuit board 220 is annular, the circuit board 220 is sleeved and fixed on the base 240 from front to back, a shaft shoulder structure with a forward step surface is arranged on the base 240, and the circuit board 220 is positioned at the shaft shoulder structure and abuts against the step surface from back. The potting layer 230 is located at the rear side of the base 240, and one end of the base 240 facing the first bottom wall 211 is arranged to abut against the first bottom wall 211; and the bracket 210, the bracket 210 comprises the first bottom wall 211 and the second peripheral wall 212 in the foregoing, the base 240 is arranged to be located in the bracket 210, and the base 240 is arranged to be a separate structure from the bracket 210, and the base 240 and the bracket 210 can be fixedly connected by locking with screws. The screw comprises a plurality of screws which are arranged at intervals in the circumferential direction, so that the base 240 and the bracket 210 can be fixed together more firmly, and the base 240 and the bracket 210 are less prone to loosening and abnormal sound; the purpose of the present application can be achieved by two, three or four, etc., the purpose of which does not depart from the design idea of the present invention, and the details are not described herein, and all of which are within the scope of the present application. The base 240 is set to be an aluminum seat, the stator winding 241 is set to include an iron core and windings, the iron core is uniformly distributed at intervals in the circumferential direction, and the windings are set to be wound on the iron core. The outer rotor assembly 100 further includes a housing 110, the housing 110 includes the first top wall 111 and the first peripheral wall 112, the first peripheral wall 112 is provided with magnetic rings for providing a magnetic field, the magnetic rings are located at the radial outer side of the iron core and are uniformly arranged at intervals along the circumferential direction, and the magnetic field generated by the magnetic rings and the magnetic field generated by the stator winding 241 interact to generate a magnetic torque, so that the outer rotor assembly 100 rotates. When the outer rotor assembly 100 rotates, normal temperature air enters the air passage 430 from the air inlet 420 and blows to the stator winding 241 and the circuit board 220, so as to exchange heat with the stator winding 241 and the circuit board 220, take away heat of the stator winding 241 and the circuit board 220, and blow to the outside from the air outlet 410.

In an exemplary embodiment, as shown in fig. 2 and 7 to 11, a second bearing cavity 242 is provided on the base 240, an opening of the second bearing cavity 242 faces the first bottom wall 211 (i.e., the opening faces rearward), a second bearing 250 is provided in the second bearing cavity 242, the first top wall 111 is provided with a rotating shaft 120 fixedly penetrating therethrough, a rear end of the rotating shaft 120 is provided to penetrate through the base 240 and extend into the second bearing 250, the first bottom wall 211 abuts against a rear end surface of the second bearing cavity 242 to close the rear end opening of the second bearing cavity 242, and the lubricating grease coated on the second bearing 250 is less prone to being affected by moisture and failing. The first bottom wall 211 is provided with a positioning groove 213 which is concave in front and convex in back, the back end of the second bearing 250 extends into the positioning groove 213 and is spaced from the bottom wall of the positioning groove 213, and the rotating shaft 120 is spaced from the bottom wall of the positioning groove 213. The rotating shaft 120 may be installed on the first top wall 111 in an interference manner; alternatively, the rotating shaft 120 is mounted on the first top wall 111 through a spline structure; the objectives of the present application can be achieved without departing from the design concept of the present invention, and therefore, the present application shall not be repeated herein and shall fall within the protection scope of the present application.

Illustratively, as shown in fig. 2 and 7 to 11, the base 240 is further provided with a first bearing cavity 243, the opening of the first bearing cavity 243 faces the first top wall 111, the first bearing cavity 243 is provided to mount the first bearing 260, and the rotating shaft 120 further extends into the first bearing 260, and the rotating shaft 120 is supported at two positions by the first bearing 260 and the second bearing 250, so that the rotating smoothness of the outer rotor assembly 100 is better.

Illustratively, the first bearing cavity 243 and the second bearing cavity 242 are two cylindrical grooves with openings facing back and forth, the first bearing 260 is installed in the cylindrical groove on the front side from front to back, the second bearing 250 is installed in the cylindrical groove on the rear side from back to front, a through shaft hole for the rotating shaft 120 to pass through is arranged between the bottom walls of the two cylindrical grooves, and the rotating shaft 120 passes through the first bearing 260, the shaft hole and the second bearing 250 from front to back in sequence and is rotatably installed on the stator assembly 200.

In an exemplary embodiment, as shown in fig. 11, the interval (i.e., radial distance) between the wind wheel 300 and the second circumferential wall 212 is set to be not more than 1mm, and the air outlet amount of the air outlet 410 is larger in the operating state of the outer rotor assembly 100.

It is possible that the distance between radial wind wheel 300 and second circumferential wall 212 is set to 0.5mm; or, it may be that the distance between radial wind wheel 300 and second circumferential wall 212 is set to 1mm; the above objectives can be achieved without departing from the design concept of the present invention, and therefore, the details are not repeated herein and all of the objectives should fall within the protection scope of the present application.

The assembling process of the outer rotor motor provided by the embodiment of the invention is as follows:

firstly: assembling the base 240, to which the stator winding 241 is mounted, and the circuit board 220 together, and mounting the first bearing 260 and the second bearing 250 in the first bearing cavity 243 and the second bearing cavity 242, respectively;

secondly, the method comprises the following steps: installing the housing with the rotating shaft 120 on the base 240 from the front side of the base 240, wherein the rotating shaft 120 sequentially passes through the first bearing 260, the shaft hole and the second bearing 250 from front to back;

and furthermore: the bracket 210 is locked and fixed on the base 240 by a screw from the rear side of the base 240;

and furthermore: injecting glue-pouring resin between the circuit board 220 and the bracket 210 to form a glue-pouring layer 230;

and finally: the wind turbine 300 is fixedly secured to the rotor assembly 100 and the wind turbine 300 is positioned in the air outlet 410.

Example two

An air conditioner (not shown in the figure in this embodiment) provided by the embodiment of the invention includes the outer rotor motor described in any one of the first embodiment.

The air conditioner has all the advantages of the outer rotor motor provided by any one of the embodiments, and the description is omitted.

The air conditioner may include a wall-mounted machine and an outdoor machine, and the external rotor motor is applied to the outdoor machine; or the air conditioner comprises a wall cabinet machine and an outdoor machine, and the outer rotor motor is applied to the cabinet machine or the outdoor machine; or the air conditioner comprises a wall cabinet machine and an outdoor machine, and the outer rotor motor is simultaneously applied to the cabinet machine and the outdoor machine; the above objectives can be achieved without departing from the design concept of the present invention, and therefore, the details are not repeated herein and all of the objectives should fall within the protection scope of the present application.

In summary, in the outer rotor motor provided in the embodiment of the present invention, the outer rotor assembly rotates with the wind wheel, under the action of the wind wheel, high-temperature air in the air passing channel is blown out from the air outlet, external normal-temperature air is fed into the air passing channel from the air inlet and exchanges heat in the air passing channel, and the outer rotor motor is cooled by heat dissipation through internal and external air circulation, so that the outer rotor motor has better heat dissipation performance and longer service life.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims (11)

1. The outer rotor motor is characterized by comprising an outer rotor assembly, a stator assembly and an annular wind wheel, wherein the outer rotor assembly is rotatably sleeved on the stator assembly, an air outlet is formed between one end of the outer rotor assembly, facing the stator assembly, and the stator assembly, the wind wheel is positioned at the air outlet, the wind wheel is fixedly sleeved on the outer rotor assembly, one end of the outer rotor assembly, facing away from the stator assembly, is provided with an air inlet, an air passing channel is arranged in a space defined by the outer rotor assembly and the stator assembly, and the air inlet and the air outlet are communicated through the air passing channel.

2. The external rotor electric machine according to claim 1, wherein the external rotor assembly includes a first top wall and a first peripheral wall connected to the first top wall, the stator assembly includes a first bottom wall and a second peripheral wall connected to the first bottom wall, an open end of the first peripheral wall extends into the second peripheral wall, the open end of the first peripheral wall is spaced from the first bottom wall, an annular air outlet is formed between the first peripheral wall and the second peripheral wall, the wind wheel is located in the air outlet, and the air inlet is located in the first top wall.

3. The external rotor electric machine of claim 2, wherein the stator assembly further includes a circuit board, the circuit board is located between the first peripheral wall and the first bottom wall, the circuit board is parallel to the first bottom wall, the open end of the first peripheral wall is spaced apart from the circuit board, and the air passage is located in an area enclosed by the first top wall, the circuit board and the first peripheral wall.

4. The external rotor electric machine of claim 3, wherein the circuit board comprises a board body and an electronic component, the electronic component is arranged on one side of the board body facing the first bottom wall, and the electronic component is sealed by glue filling.

5. The external rotor electric machine of claim 4, wherein the potting layer fills the region between the plate body, the first bottom wall and the second peripheral wall, and an edge of the potting layer facing the first top wall is at most flush with a side of the plate body facing the first top wall.

6. The external rotor electric machine of claim 3, wherein the stator assembly further comprises:

the circuit board is positioned between the stator winding and the first bottom wall, and is sleeved on the base; and

a bracket including the first bottom wall and the second peripheral wall, the base being mounted within the bracket.

7. The external rotor electric machine of claim 6, wherein the base is provided with a second bearing cavity with an opening facing the first bottom wall, a second bearing is installed in the second bearing cavity, the first top wall is provided with a fixing hole, a rotating shaft is fixed in the fixing hole, one end of the rotating shaft extends into the second bearing cavity, the second bearing is sleeved on the rotating shaft, and the first bottom wall closes the opening end of the second bearing cavity.

8. The external rotor electric machine according to claim 7, wherein the base is further provided with a first bearing cavity with an opening facing the first top wall, a first bearing is installed in the first bearing cavity, and the first bearing is sleeved on the rotating shaft.

9. The external rotor electric machine according to any one of claims 2 to 8, wherein the radial distance between the wind wheel and the second circumferential wall is not more than 1mm.

10. The external rotor electric machine according to any of claims 1-8,

the wind wheel is a metal piece or a plastic piece; and/or

The wind wheel is fixedly bonded or clamped or fixedly sleeved on the outer rotor component through a screw locking.

11. An air conditioner, characterized by comprising the outer rotor motor according to any one of claims 1 to 10.

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