Motor and fan

Abstract

The utility model relates to the technical field of fans, and particularly discloses a motor and a fan. The motor comprises a supporting part, a rotating shaft, a rotating part, a stator and a rotor. Wherein the rotating shaft is rotatably arranged on the supporting part, and the rotating shaft is provided with a first fixing part used for being connected with an impeller; the rotating part is arranged on the rotating shaft and is coaxial with the rotating shaft, the supporting part is sleeved with the rotating part, and the rotating part is provided with a second fixing part used for being connected with the impeller; the stator is arranged on the supporting component; the rotor is arranged on the rotating part and matched with the stator so as to rotate around the axis of the rotating shaft when powered on and drive the rotating part and the rotating shaft to rotate. According to the motor provided by the utility model, the motor can be connected with the impeller through the first fixing part or the second fixing part so as to drive the impeller to rotate. As the first fixing part and the second fixing part provide two different impeller mounting modes, the motor can be matched with impellers of different specifications, and has better compatibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field more specifically, relate to a motor and fan. BACKGROUND

[0002] Fan is relied on the input mechanical energy, improves gas pressure and sends gas's machinery. Fan is widely used in ventilation, dust removal, cooling and the like field. Fan mainly includes casing, impeller, motor and the like, and the motor drives the impeller rotation to drive gas flow.

[0003] In the process of realizing the present application, the inventor found that the prior art at least has the following problems:

[0004] The motor of the conventional fan can usually only adapt to the impeller of the same model, that is, the compatibility is poor. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a motor and fan, the structural design of the motor and fan can effectively solve the problem of poor compatibility of the fan.

[0006] In order to achieve the above object, the utility model provides the following technical scheme:

[0007] A motor, comprising:

[0008] Supporting part;

[0009] Shaft, rotatably arranged in the supporting part, the shaft is provided with a first fixed part for connecting with a to-be-driven part;

[0010] Rotating part, arranged in the shaft and coaxial with the shaft, and the rotating part is sleeved outside the supporting part, and the rotating part is provided with a second fixed part for connecting with a to-be-driven part;

[0011] Stator, arranged in the supporting part;

[0012] Rotor, arranged in the rotating part, and cooperating with the stator to rotate around the axis of the shaft and drive the rotating part and the shaft to rotate when energized.

[0013] Optionally, in the above-mentioned motor, the rotating part comprises:

[0014] Outer cylinder, sleeved on the outer periphery of the supporting part, the outer cylinder and the supporting part form an annular cavity, and the stator and the rotor are arranged in the annular cavity;

[0015] A top plate is arranged at the top end of the outer cylinder body, the center of the top plate is provided with a mounting hole, the rotating shaft is arranged in the mounting hole, and the top end of the rotating shaft protrudes from the top plate, and the first fixing part is arranged at the top end of the rotating shaft.

[0016] Optionally, in the motor, the rotating part further comprises a pad, the pad is used for detachably connecting to the top plate, and the height of the pad is greater than the height of the rotating shaft protruding from the top plate.

[0017] Optionally, in the motor, the second fixing part comprises a threaded hole arranged on the top plate, the pad is provided with a through hole opposite to the threaded hole, and the threaded hole is used for connecting to the driven part through a bolt.

[0018] Optionally, in the motor, the center of the top plate extends to the direction of the supporting part to form a boss, the mounting hole is arranged on the boss, one end of the boss close to the supporting part is in the shape of a circular truncated cone, and the outer diameter of the circular truncated cone increases from one end close to the supporting part to the other end.

[0019] Optionally, in the motor, the second fixing part is arranged at the top end of the rotating part close to the outer side edge.

[0020] Optionally, in the motor, the first fixing part and the second fixing part are respectively used for detachably connecting to the driven part.

[0021] Optionally, in the motor, the supporting part is provided with an inner hole, the rotating shaft is arranged in the inner hole, and a bearing is arranged between the hole wall of the inner hole and the outer peripheral surface of the rotating shaft.

[0022] Optionally, in the motor, the supporting part comprises:

[0023] An inner cylinder body is sleeved in the rotating part, and the inner hole is arranged in the inner cylinder body.

[0024] A bottom plate is arranged at the bottom end of the inner cylinder body, the bottom plate extends to the edge protruding from the rotating part along the radial direction of the rotating part, and the bottom plate has a gap with the rotating part in the axial direction.

[0025] The motor provided by the utility model, comprising a supporting part, a rotating shaft, a rotating part, a stator and a rotor. Wherein, the rotating shaft is rotatably arranged in the supporting part, and the rotating shaft is provided with a first fixing part for connecting with a driven part; the rotating part is arranged on the rotating shaft and coaxial with the rotating shaft, and the rotating part is sleeved outside the supporting part, and the rotating part is provided with a second fixing part for connecting with the driven part; the stator is arranged in the supporting part; the rotor is arranged in the rotating part and cooperates with the stator to rotate around the axis of the rotating shaft and drive the rotating part and the rotating shaft to rotate when electrified.

[0026] The motor provided by the utility model, when electrified, the rotor is acted on by the magnetic field force generated by the stator to start rotating around the axis of the rotating shaft, meanwhile, the rotor drives the rotating component to rotate, and the rotating component drives the rotating shaft connected therewith to rotate around its own axis. The rotating shaft is provided with the first fixing part, and the rotating component is provided with the second fixing part, so that the motor can be connected with the to-be-driven member through the first fixing part or the second fixing part to drive the to-be-driven member to rotate. Since the first fixing part and the second fixing part provide two different to-be-driven member installation modes, the motor can be adapted to to-be-driven members of different specifications, and different to-be-driven member structures can be replaced according to different requirements.

[0027] In summary, compared with the conventional motor which can only be adapted to the same type of to-be-driven member, the motor provided by the application can be applied to the impeller structures of different fans, and has better compatibility.

[0028] In order to achieve the above purpose, the utility model also provides a fan, the fan includes any one of the above motors. Since the motor has the above technical effects, the fan with the motor should also have corresponding technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Figure 1 It is a structure schematic view of the fan of one specific embodiment of the utility model;

[0031] Figure 2 It is a structure schematic view of the fan of another specific embodiment of the utility model;

[0032] Figure 3 It is a structure schematic view of the motor of one specific embodiment of the utility model assembling a conventional impeller.

[0033] REFERENCE SIGNS:

[0034] 1-supporting component; 2-rotating shaft; 3-rotating component; 4-stator; 5-rotor; 6-bearing; 7-bolt; 8-impeller;

[0035] 11-inner hole; 12-inner cylinder; 13-bottom plate; 21-first fixing part; 31-second fixing part; 32-outer cylinder; 33-top plate; 34-pad; 301-annular cavity; 331-mounting hole; 332- boss; 341-through hole. DETAILED DESCRIPTION

[0036] The utility model discloses a motor and fan to be applicable to the installation of different structures of to be driven member, improve the compatibility of motor.

[0037] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work fall within the protection scope of the utility model.

[0038] The motor provided by the application is used for driving the rotation of the to be driven member, and is applicable to but not limited to the fan, that is, the to be driven member includes but is not limited to the impeller. For the convenience of description, in each of the following embodiments, the to be driven member is taken as the impeller as an example.

[0039] In some embodiments, referring to Figures 1-2 The motor provided by the utility model comprises a supporting component 1, a rotating shaft 2, a rotating component 3, a stator 4 and a rotor 5. The supporting component 1 is the main supporting structure of the motor, facilitating the installation of other components. The rotating shaft 2 is rotatably arranged on the supporting component 1, and the rotating shaft 2 is provided with a first fixing part 21 used for being connected with the impeller 8. It should be noted that the rotation of the rotating shaft 2 takes its own axis as the rotation center. The form of the first fixing part 21 is not specifically limited here, and the fixing of the first fixing part 21 and the impeller 8 can be realized by cooperation, that is, the impeller 8 can be installed on the motor through the first fixing part 21 to rotate under the driving of the motor.

[0040] The rotating component 3 is coaxially arranged on the rotating shaft 2 and is sleeved outside the supporting component 1, and the rotating component 3 is provided with a second fixing part 31 used for being connected with the impeller 8. The rotating component 3 is coaxial with the rotating shaft 2, and the rotating component 3 can rotate around the axis of the rotating shaft 2. The form of the second fixing part 31 is not specifically limited here, and the fixing of the second fixing part 31 and the impeller 8 can be realized by cooperation, that is, the impeller 8 can be installed on the motor through the second fixing part 31 to rotate under the driving of the motor.

[0041] The stator 4 is arranged on the supporting component 1, and the rotor 5 is arranged on the rotating component 3 and cooperates with the stator 4 to rotate around the axis of the rotating shaft 2 and drive the rotating component 3 and the rotating shaft 2 to rotate when electrified. The specific structure of the stator 4 and the rotor 5 can refer to the setting of a conventional motor. For example, the stator 4 comprises an iron core, and the rotor 5 comprises a magnet. When electrified, the magnet starts to rotate under the action of the magnetic field force, thereby driving the rotating component 3 to rotate. Since the rotating component 3 is arranged on the rotating shaft 2, the rotating component 3 drives the rotating shaft 2 to rotate. It can be understood that the rotation of the rotor 5, the rotating component 3 and the rotating shaft 2 is coaxial, and each rotates around the axis of the rotating shaft 2.

[0042] When the motor provided by this invention is energized, the rotor 5 begins to rotate around the axis of the shaft 2 under the influence of the magnetic field force generated by the stator 4. Simultaneously, the rotor 5 drives the rotating component 3 to rotate, which in turn drives the shaft 2 connected to it to rotate around its own axis. The shaft 2 is provided with a first fixing part 21, and the rotating component 3 is provided with a second fixing part 31. The motor can be connected to the impeller 8 through either the first fixing part 21 or the second fixing part 31, thereby driving the impeller 8 to rotate. Since the first fixing part 21 and the second fixing part 31 provide two different impeller 8 mounting methods, Figure 1 The installation method is shown, in which the impeller 8 is connected to the second fixing part 31. When the motor is powered on, the rotor 5 is subjected to magnetic force and begins to rotate, thereby driving the rotating part 3 to rotate. The impeller 8 is installed on the rotating part 3, so the rotating part 3 drives the impeller 8 to rotate. Figure 2 The installation method is shown, in which the first fixing part 21 connects to another impeller 8. When the motor is energized, the rotor 5 is subjected to magnetic force and begins to rotate, thereby driving the rotating part 3 to rotate. The rotating part 3 and the rotating shaft 2 are tightly fitted together, so the rotating shaft 2 begins to rotate, thereby driving the impeller 8 mounted on the rotating shaft 2 to rotate. This motor can be adapted to impellers 8 of different specifications.

[0043] In summary, compared to conventional motors that can only be adapted to the same type of impeller 8, the motor provided in this application can be adapted to the impeller 8 structures of different fans, and has better compatibility.

[0044] In some embodiments, the rotating component 3 includes an outer cylinder 32 and a top plate 33. The outer cylinder 32 is sleeved on the outer periphery of the supporting component 1, forming an annular cavity 301 between the outer cylinder 32 and the supporting component 1. The stator 4 and the rotor 5 are disposed within the annular cavity 301. The top plate 33 is located at the top end of the outer cylinder 32, and a mounting hole 331 is provided at the center of the top plate 33. The rotating shaft 2 is disposed in the mounting hole 331, and the top end of the rotating shaft 2 protrudes from the top plate 33. It is understood that the outer cylinder 32 and the top plate 33 can be an integral structure or a separate structure connected by a conventional fixing method. The annular cavity 301 between the outer cylinder 32 and the supporting component 1 provides mounting space for the stator 4 and the rotor 5. It is understood that when the stator 4 and the rotor 5 are respectively mounted on the supporting component 1 and the outer cylinder 32, there is a certain gap between the stator 4 and the rotor 5. The top plate 33 is located at the top of the outer cylinder 32. It is understood that the "top" direction in this application refers to the direction closer to the impeller 8, and the "bottom" direction is correspondingly the direction away from the impeller 8. The top plate 33 facilitates connection with the rotating shaft 2. For example, the rotating shaft 2 is interference-fitted with the mounting hole 331, allowing the rotating shaft 2 to rotate synchronously with the rotating component 3. The top of the rotating shaft 2 protrudes from the top plate 33, and the first fixing part 21 is located at the top of the rotating shaft 2, thereby facilitating connection with the impeller 8.

[0045] In some embodiments, the rotating component 3 further includes a pad 34, which is detachably connected to the top plate 33. The pad 34 serves as a limit, and by setting the pad 34, the top plate 33 can be raised, that is, the support position of the impeller 8 can be raised, so different specifications of impellers 8 can be selected for installation as needed.

[0046] Furthermore, the height of the pad 34 is greater than the height of the shaft 2 protruding from the top plate 33. Common impellers 8 have a raised bottom structure, such as... Figure 3 As shown, the airflow loss is significant during operation, thus adversely affecting the efficiency of the fan. In this embodiment, the rotating component 3 also includes a pad 34, and the pad 34 is detachably connected to the top plate 33. When the impeller 8 is installed using the first fixing part 21, the pad 34 can be removed as needed to avoid misalignment with the impeller 8, facilitating the fixing of the impeller 8 to the first fixing part 21, such as... Figure 2 As shown. When the impeller 8 is installed using the second fixing part 31, the pad 34 can be installed on the top plate 33 as needed. Since the height of the pad 34 is greater than the height of the shaft 2 protruding from the top plate 33, the flat-bottomed impeller 8 can be installed. The bottom of the impeller 8 does not need to be equipped with a protruding structure, which reduces airflow loss during operation, thereby improving efficiency, increasing utilization, and thus improving the performance of the fan.

[0047] It is understood that when the rotating component 3 includes a top plate 33 and a pad 34, the second fixing part 31 can be provided on the top plate 33, on the pad 34, or on both the top plate 33 and the pad 34. For example, the top plate 33 is provided with the second fixing part 31; in one embodiment, such as... Figure 3 As shown, without the pad 34, the impeller 8 is installed directly through the second fixing part 31 on the top plate 33; in another method, as... Figure 1 As shown, a pad 34 is connected to the top plate 33, and the impeller 8 is fastened to the second fixing part 31 on the top plate 33. These two different installation methods allow for the connection of impellers 8 with different structures.

[0048] In some embodiments, the second fixing part 31 includes a screw hole provided in the top plate 33, and the pad 34 is provided with a through hole 341 opposite to the screw hole. The screw hole is used to connect to the impeller 8 by bolts 7. It can be understood that the bottom end of the screw hole provided in the top plate 33 may or may not extend to the outer cylinder 32, depending on the tightening requirements with the bolts 7. The second fixing part 31 adopts the above configuration, which on the one hand allows for easy connection with the impeller 8 and bolts 7, and the connection is reliable. On the other hand, it allows for easy replacement of the installation of the pad 34 and the option of not installing the pad 34, and the through hole 341 on the pad 34 is sufficient to meet the connection between the impeller 8 and the top plate 33 and bolts 7, resulting in a simple structure. In other embodiments, the second fixing part 31 may also adopt other detachable connection structures such as snap-fit.

[0049] In some embodiments, a boss 332 extends from the center of the top plate 33 toward the support member 1, and a mounting hole 331 is provided on the boss 332. The presence of the boss 332 extends the axial depth of the mounting hole 331, thereby increasing the contact area with the rotating shaft 2, making the positioning and connection between the rotating shaft 2 and the top plate 33 more stable and reliable. Furthermore, the end of the boss 332 near the support member 1 is a frustum, and the outer diameter of the frustum increases from the end facing the support member 1 to the other end. That is, the top surface of the frustum faces the support member 1. The frustum design avoids interference with the support member 1, thereby making full use of space and maximizing the depth of the mounting hole 331.

[0050] In some embodiments, the second fixing part 31 is located at the top end of the rotating component 3 near its outer edge. When the second fixing part 31 includes a screw hole, the screw hole is located at the top end of the rotating component 3 and near its outer edge. When the rotating component 3 includes an outer cylinder 32 and a top plate 33, the screw hole is opposite to or extends to the outer cylinder 32. Since the second fixing part 31 is located on the outside relative to the first fixing part 21, for the impeller 8 that cooperates with a conventional inner rotor motor (referred to as the inner rotor impeller for ease of explanation), the inner rotor impeller can be installed on the first fixing part 21 of the motor of this application. The rotor 5 drives the rotating component 3 to rotate, the rotating component 3 drives the rotating shaft 2 to rotate, and thus drives the inner rotor impeller to rotate, i.e., the motor is in the inner rotor operating mode. For the impeller 8 that cooperates with a conventional outer rotor motor (referred to as the outer rotor impeller for ease of explanation), the outer rotor impeller can be installed on the second fixing part 31 of the motor of this application. The rotor 5 drives the rotating component 3 to rotate, and the outer rotor impeller connected to the rotating component 3 rotates, i.e., the motor is in the outer rotor operating mode. The motor provided in this application can output in either an inner rotor mode or an outer rotor mode, thus it can be matched with either an inner rotor impeller or an outer rotor impeller, respectively. In summary, with the above configuration, the first fixing part 21 and the second fixing part 31 form an output structure in which the inner and outer rings rotate simultaneously, enabling the motor to be applicable to both inner rotor and outer rotor impeller structures, increasing the compatibility of different motors.

[0051] In some embodiments, the first fixing part 21 and the second fixing part 31 are respectively used for detachable connection with the impeller 8. Exemplarily, the first fixing part 21 and the second fixing part 31 are respectively used for bolt connection, snap-fit ​​connection, or pin connection with the impeller 8. It is understood that the connection method between the first fixing part 21 and the impeller 8, and the connection method between the second fixing part 31 and the impeller 8, can be the same or different. The detachable connection between the first fixing part 21 and the second fixing part 31 and the impeller 8 allows the motor to not only select and install impellers of different specifications as needed, but also to replace different impeller 8 structures according to different requirements, and facilitates disassembly and assembly. In summary, this motor not only has better compatibility, but also improves product interchangeability, facilitates disassembly and maintenance, and reduces maintenance costs.

[0052] In some embodiments, the support member 1 has an inner hole 11, the rotating shaft 2 is disposed in the inner hole 11, and a bearing 6 is provided between the wall of the inner hole 11 and the outer peripheral surface of the rotating shaft 2. The support member 1 has an inner hole 11 and is rotatably connected to the rotating shaft 2. The bearing 6 is provided between the support member 1 and the rotating shaft 2 to reduce friction during rotation while the rotating shaft 2 rotates relative to the support member 1, thereby improving the stability of the motor and extending its service life. For example, at least two bearings 6 are provided between the support member 1 and the rotating shaft 2, respectively cooperating with the rotating shaft 2 from the top and bottom ends of the inner hole 11, to better limit the position of the rotating shaft 2.

[0053] In some embodiments, the support component 1 includes an inner cylinder 12 and a bottom plate 13. The inner cylinder 12 is fitted inside the rotating component 3, and an inner hole 11 is provided within the inner cylinder 12; the bottom plate 13 is located at the bottom end of the inner cylinder 12. It is understood that the inner cylinder 12 and the bottom plate 13 can be either an integral structure or a separate structure connected by a conventional fixing method. The inner cylinder 12 facilitates cooperation with the bearing 6 and the installation of the stator 4. When the rotating component 3 includes an outer cylinder 32 and a top plate 33, the inner cylinder 12 is fitted inside the outer cylinder 32, forming an annular cavity 301 between them. The top plate 33 is located at the top of the inner cylinder 12 and spaced apart to avoid friction during rotation. The bottom plate 13 provides support, facilitating the installation and placement of the motor.

[0054] In some embodiments, the base plate 13 extends radially along the rotating component 3 to protrude beyond the edge of the rotating component 3, and there is an axial gap between the base plate 13 and the rotating component 3. For example, the base plate 13 is circular, and its outer diameter is larger than that of the rotating component 3. This arrangement allows the base plate 13 to shield the annular cavity 301, providing dust protection and protection. Simultaneously, the larger area of ​​the base plate 13 provides more stable support. Furthermore, the axial gap between the base plate 13 and the rotating component 3 prevents friction between the rotating component 3 and the base plate 13 during rotation, reducing the resistance to rotation and preventing wear.

[0055] Based on the motors provided in the above embodiments, this utility model also provides a fan, which includes an impeller and any one of the motors described in the above embodiments. The impeller is disposed in a first fixed part or a second fixed part. That is, the fan can be replaced. Since the fan uses the motors described in the above embodiments, please refer to the above embodiments for the beneficial effects of the fan. In addition, the motor of this fan adopts an external structure, which greatly reduces the size of the product and thus reduces the installation volume.

[0056] In some embodiments, please refer to Figure 1 and Figure 2 The impeller 8 has a flat end facing the motor, and the flat end is fixedly connected to the first fixing part 21 or the second fixing part 31. Unlike conventional impellers, which require a protrusion at the bottom for connection with the motor, in this embodiment, the end of the impeller 8 connected to the motor does not need a protrusion. This reduces airflow loss during impeller 8 operation, improves efficiency, increases utilization, and thus enhances the performance of the fan.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric motor, characterized in that, include: Support component (1); A rotating shaft (2) is rotatably disposed on the support member (1), and the rotating shaft (2) is provided with a first fixing part (21) for connecting with the drive member. A rotating component (3) is provided on the rotating shaft (2) and coaxial with the rotating shaft (2), and the rotating component (3) is sleeved outside the supporting component (1). The rotating component (3) is provided with a second fixing part (31) for connecting with the drive component. Stator (4) is provided on the support component (1); The rotor (5) is located on the rotating component (3) and cooperates with the stator (4) to rotate around the axis of the rotating shaft (2) when energized, and drive the rotating component (3) and the rotating shaft (2) to rotate.

2. The motor according to claim 1, characterized in that, The rotating component (3) includes: The outer cylinder (32) is sleeved on the outer periphery of the support component (1), and an annular cavity (301) is formed between the outer cylinder (32) and the support component (1). The stator (4) and the rotor (5) are disposed in the annular cavity (301). A top plate (33) is provided at the top of the outer cylinder (32). The top plate (33) has a mounting hole (331) at its center. The rotating shaft (2) is provided in the mounting hole (331), and the top of the rotating shaft (2) protrudes from the top plate (33). The first fixing part (21) is provided at the top of the rotating shaft (2).

3. The motor according to claim 2, characterized in that, The rotating component (3) further includes a pad (34) for detachably connecting to the top plate (33), the height of the pad (34) being greater than the height of the rotating shaft (2) protruding from the top plate (33).

4. The motor according to claim 3, characterized in that, The second fixing part (31) includes a screw hole provided on the top plate (33), and the pad (34) is provided with a through hole (341) opposite to the screw hole. The screw hole is used to connect to the drive member by a bolt (7).

5. The motor according to claim 2, characterized in that, The top plate (33) extends from the center toward the support member (1) to form a boss (332), the mounting hole (331) is provided on the boss (332), the end of the boss (332) near the support member (1) is a frustum, and the outer diameter of the frustum increases from the end toward the support member (1) to the other end.

6. The motor according to claim 1, characterized in that, The second fixing part (31) is located at the top of the rotating part (3) near the outer edge.

7. The motor according to claim 1, characterized in that, The first fixing part (21) and the second fixing part (31) are respectively used to detachably connect with the component to be driven.

8. The motor according to any one of claims 1-7, characterized in that, The support component (1) has an inner hole (11), the rotating shaft (2) is located in the inner hole (11), and a bearing (6) is provided between the hole wall of the inner hole (11) and the outer peripheral surface of the rotating shaft (2).

9. The motor according to claim 8, characterized in that, The support component (1) includes: The inner cylinder (12) is fitted inside the rotating component (3), and the inner hole (11) is provided in the inner cylinder (12). A base plate (13) is provided at the bottom end of the inner cylinder (12). The base plate (13) extends radially along the rotating component (3) to protrude from the edge of the rotating component (3). The base plate (13) and the rotating component (3) have an axial gap.

10. A fan, comprising an impeller (8) and a motor, characterized in that, The motor is the motor as described in any one of claims 1-9, and the impeller (8) is disposed on the first fixing part (21) or the second fixing part (31).

11. The fan according to claim 10, characterized in that, The impeller (8) has a flat end facing the motor, and the flat end is fixedly connected to the first fixing part (21) or the second fixing part (31).

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