External rotor motor

Abstract

The embodiment of the utility model provides an external rotor motor. The external rotor motor comprises a mounting shaft, an external rotor, a rotating shaft, a band-type brake device and a first sealing element, wherein the external rotor, the rotating shaft and the band-type brake device are sequentially arranged along the mounting shaft; the outer rotor is rotationally connected to one end of the mounting shaft; the band-type brake device and the outer rotor are arranged on the mounting shaft in parallel; the rotating shaft sleeves the mounting shaft, is fixedly connected with the outer rotor and rotates along with the outer rotor; the band-type brake device is sleeved on the mounting shaft; the band-type brake device comprises a follow-up friction plate and a brake assembly. The follow-up friction plate is connected with the rotating shaft and rotates along with the rotating shaft; the braking assembly is connected with the mounting shaft, and the braking assembly is used for enabling the follow-up friction plate to stop rotating during braking; the first sealing piece is arranged on the periphery of the band-type brake device in a sleeving mode. In the embodiment of the invention, the first sealing piece is arranged on the periphery of the band-type brake device in a sleeving manner, so that external dust and water vapor can be prevented from entering the inside of the band-type brake device from the periphery of the band-type brake device, and the sealing performance of the band-type brake device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an outer rotor motor. Background Art

[0002] Compared with ordinary electric motors, external rotor motors are widely used because of their high efficiency, low noise, light weight, and easy installation and maintenance.

[0003] Typically, an outer rotor motor uses a holding brake device as a braking device. The holding brake device can brake the outer rotor when the outer rotor motor is powered off, so that the outer rotor stops rotating.

[0004] In the related art, the main components of the brake device of the outer rotor motor are exposed, with poor sealing performance, and are easily affected by environmental factors such as water vapor and dust, resulting in unsatisfactory braking effect or even failure, and a shortened service life. Utility Model Content

[0005] The purpose of the embodiment of the present application is to provide an outer rotor motor, which can improve the sealing of the brake device, reduce the influence of environmental factors such as water vapor and dust, and ensure the braking effect. The specific technical solution is as follows:

[0006] The embodiment of the present application provides an outer rotor motor, the outer rotor motor comprising:

[0007] An installation shaft, an outer rotor, a rotating shaft and a brake device arranged in sequence along the installation shaft, and a first sealing member;

[0008] The outer rotor is rotatably connected to one end of the mounting shaft; the brake device and the outer rotor are arranged in parallel on the mounting shaft;

[0009] The rotating shaft is sleeved on the mounting shaft and is fixedly connected to the outer rotor and rotates with the outer rotor;

[0010] The holding brake device is sleeved on the mounting shaft; the holding brake device comprises: a follower friction plate and a brake assembly; the follower friction plate is connected to the rotating shaft and rotates with the rotating shaft; the brake assembly is connected to the mounting shaft, and the brake assembly is used to stop the follower friction plate from rotating when braking;

[0011] The first sealing member is sleeved on the outer circumference of the brake device.

[0012] In some embodiments, the brake assembly of the holding brake device includes:

[0013] A fixed plate, a moving plate and an electromagnetic coil are arranged in parallel along the axial direction of the mounting shaft; the follower friction plate is arranged between the fixed plate and the moving plate;

[0014] When the electromagnetic coil is energized, the electromagnetic coil attracts the moving plate;

[0015] When the electromagnetic coil is powered off, the moving plate can move axially along the mounting shaft to squeeze the follower friction plate so that the follower friction plate stops rotating.

[0016] In some embodiments, the outer rotor motor further comprises a second seal;

[0017] The second sealing member is sleeved between the rotating shaft and the fixed plate.

[0018] In some embodiments, the rotating shaft comprises a circular disk, a circular boss is provided on the side of the circular disk facing the electromagnetic coil, and a square boss is provided on the side of the circular boss facing the electromagnetic coil;

[0019] The follower friction plate has a square mounting hole, and the square mounting hole can be matched with the square boss.

[0020] In some embodiments, the circular boss is located opposite to the fixed plate, and the second sealing member is disposed between the outer circumferential surface of the circular boss and the inner circumferential surface of the fixed plate.

[0021] In some embodiments, a plurality of recesses are provided on the outer periphery of the movable plate, and the brake device further includes a connecting column, which is parallel to the axial direction of the mounting shaft, and the connecting column can be fixedly connected to the fixed plate via a first connecting member, and the connecting column is partially located in the recess, and the movable plate can move along the connecting column.

[0022] In some embodiments, the second sealing member is a skeleton oil seal.

[0023] In some embodiments, the first sealing member is a rubber sleeve, which includes a retaining ring and retaining edges arranged on both sides of the retaining ring, the retaining ring is perpendicular to the retaining edges, the retaining ring is against the outer periphery of the fixed plate and the electromagnetic coil, and the two retaining edges are respectively against the outer side surface of the fixed plate and the outer side surface of the electromagnetic coil.

[0024] In some embodiments, an avoidance groove is provided on the inner wall of the retaining ring, and the avoidance groove is opposite to the position of the moving plate.

[0025] In some embodiments, a wire outlet hole is provided at a rib away from the outer rotor, and the wire of the electromagnetic coil is led out through the wire outlet hole.

[0026] In some embodiments, a protrusion is provided on the rib away from the outer rotor, and the wire outlet hole is provided on the protrusion.

[0027] The outer rotor motor provided in the embodiment of the present application can drive the follower friction plate to move through the rotating shaft when the outer rotor rotates. When the brake device receives a braking command, the brake assembly can stop the follower friction plate from moving, thereby stopping the outer rotor from moving, thereby achieving the braking of the outer rotor motor. The first sealing member is sleeved on the outer periphery of the brake device, so that the cavity between the internal components of the brake device is not exposed to the air, and external dust and water vapor can be prevented from entering the interior of the brake device from the outer periphery of the brake device, thereby improving the sealing of the brake device, ensuring the braking effect of the brake device, and increasing the service life of the brake device.

[0028] Of course, any product implementing the present application does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0030] Figure 1 A cross-sectional view of an outer rotor motor provided in an embodiment of the present application;

[0031] Figure 2 An axial side view of an outer rotor motor provided in an embodiment of the present application;

[0032] Figure 3 An axial side view from another perspective of the outer rotor motor provided in an embodiment of the present application;

[0033] Figure 4 An exploded view of an outer rotor motor provided in an embodiment of the present application;

[0034] Figure 5 This is an enlarged view of the connection between the skeleton oil seal and the rotating shaft in the embodiment of the present application;

[0035] Figure 6 A side view of the rotating shaft in the embodiment of the present application;

[0036] Figure 7 This is a front view of the rotating shaft in the embodiment of the present application;

[0037] Figure 8 This is an axial side view of the first sealing member in the embodiment of the present application;

[0038] Fig. 9 It is a cross-sectional view of the first sealing member in the embodiment of the present application. Description of the drawings:

[0040] The mounting shaft 10; the mounting key 11; the outer rotor 20; the outer end cover 21; the inner end cover 22; the rotor housing 23; the bearing 24; the second connecting member 25; the rotating shaft 30; the disc 31; the circular boss 32; the square boss 33; the brake device 40; the follower friction plate 41; the square mounting hole 411; the brake assembly 42; the fixed plate 421; the mounting groove 4211; the moving plate 422; the recess 4221; the electromagnetic coil 423; the wire 4231; the elastic member 424; the connecting column 43; the first connecting member 431; the first sealing member 50; the retaining ring 51; the avoidance groove 511; the retaining edge 52; the outlet hole 521; the protrusion 522; the second sealing member 60; the lip 61; the stator 70; the hexagonal nut 81; the third connecting member 82; DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0042] like Figure 1 As shown, an embodiment of the present application provides an outer rotor motor, which includes: a mounting shaft 10, an outer rotor 20, a rotating shaft 30 and a brake device 40 arranged in sequence along the mounting shaft 10, and a first seal 50; the outer rotor 20 is rotatably connected to one end of the mounting shaft 10; the brake device 40 and the outer rotor 20 are arranged in parallel on the mounting shaft 10; the rotating shaft 30 is sleeved on the mounting shaft 10 and fixedly connected to the outer rotor 20, and rotates with the outer rotor 20; the brake device 40 is sleeved on the mounting shaft 10; the brake device 40 includes: a follower friction plate 41 and a brake assembly 42; the follower friction plate 41 is connected to the rotating shaft 30 and rotates with the rotating shaft 30; the brake assembly 42 is connected to the mounting shaft 10, and the brake assembly 42 is used to stop the follower friction plate 41 from rotating when braking; the first seal 50 is sleeved on the outer periphery of the brake device 40.

[0043] like Figure 1 As shown, in the outer rotor motor provided by the embodiment of the present application, when the outer rotor 20 rotates, the follower friction plate 41 can be driven to move through the rotating shaft 30. When the brake device 40 receives a braking command, the brake assembly 42 can stop the follower friction plate 41 from moving, thereby stopping the outer rotor 20 from moving, thereby achieving the braking of the outer rotor motor. The first seal 50 is sleeved on the outer periphery of the brake device 40, so that the cavity between the internal components of the brake device 40 is not exposed to the air, and external dust and water vapor can be prevented from entering the inside of the brake device 40 from the outer periphery of the brake device 40, thereby improving the sealing of the brake device 40, ensuring the braking effect of the brake device 40, and increasing the service life of the brake device 40.

[0044] In addition, if Figure 1 As shown, the brake device 40 and the outer rotor 20 are arranged in parallel on the mounting shaft 10. Compared with arranging the brake device 40 inside the outer rotor 20, arranging the brake device 40 outside the outer rotor 20 can reduce the volume of the outer rotor 20 and thus reduce the layout space of the outer rotor motor.

[0045] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, the outer rotor 20 includes an outer end cover 21, an inner end cover 22 and a rotor housing 23. The outer end cover 21 and the inner end cover 22 are respectively fixedly connected to the two sides of the rotor housing 23. The diameter of the rotor housing 23 is smaller than that of the outer end cover 21 and the inner end cover 22.

[0046] More specifically, Figure 1 As shown, the outer end cover 21 and the inner end cover 22 are fixedly connected to the rotor housing 23 through the second connecting member 25, and the second connecting member 25 can be a screw; the outer rotor 20 also includes two bearings 24, which are respectively arranged between the outer end cover 21 and the mounting shaft 10 and between the inner end cover 22 and the mounting shaft 10, and the outer rotor 20 is rotatably connected to the mounting shaft 10 through the bearings 24. The bearings 24 can reduce the friction between the outer rotor 20 and the mounting shaft 10, and are easy to install and disassemble and are light in weight.

[0047] It should be noted that if Figure 1 As shown, the outer rotor motor also includes a stator 70, which is arranged inside the outer rotor 20 and sleeved on the mounting shaft 10. When an external power source applies current, the stator 70 generates a magnetic field, which interacts with the magnetic field of the outer rotor 20 to cause the outer rotor 20 to rotate.

[0048] It should be noted that the material of the first sealing member 50 may be rubber, plastic or metal, and the first sealing member 50 may be installed by gluing or other methods.

[0049] In practical applications, the outer rotor motor is fixed to the chassis of the AGV (Automated Guided Vehicle) trolley through the mounting shaft 10, and a tire is installed on the outer rotor 20 to be used as a walking hub motor; if gears and other structural parts are installed on the inner end cover or outer end cover of the outer rotor, it can also be applied to other rotary actuators.

[0050] In some embodiments of the present application, Figure 1 and Figure 4As shown, the brake assembly 42 of the brake device 40 includes: a fixed plate 421, a movable plate 422 and an electromagnetic coil 423 arranged in parallel along the axial direction of the mounting shaft 10; the follower friction plate 41 is arranged between the fixed plate 421 and the movable plate 422; when the electromagnetic coil 423 is energized, the electromagnetic coil 423 attracts the movable plate 422; when the electromagnetic coil 423 is de-energized, the movable plate 422 can move axially along the mounting shaft 10, squeezing the follower friction plate to stop the rotation of the follower friction plate.

[0051] In the present application embodiment, Figure 1 As shown, when the electromagnetic coil 423 is energized, the electromagnetic coil 423 attracts the moving plate 422, and the follower friction plate 41 is not squeezed and can rotate freely with the rotating shaft 30; when the brake device receives a braking command and the electromagnetic coil 423 is powered off, or the electromagnetic coil 423 loses power, the electromagnetic coil 423 and the moving plate 422 lose attraction, causing the elastic member 424 in the electromagnetic coil 423 to release elastic force, pushing the moving plate 422 along the axial direction of the mounting shaft 10 and moving away from the electromagnetic coil 423, the moving plate 422 squeezes the follower friction plate 41, the follower friction plate 41 is pressed against the fixed plate 421, the follower friction plate 41 stops rotating due to the friction between the moving plate 422 and the fixed plate 421, the rotating shaft 30 stops rotating, and then the outer rotor 20 stops rotating, thereby achieving the braking of the outer rotor motor.

[0052] It should be noted that the material of the moving plate 422 is a metal material that can be attracted by the electromagnetic coil 423. When the electromagnetic coil 423 attracts the moving plate 422, the elastic member 424 in the electromagnetic coil 423 is in a compressed state.

[0053] like Figure 1 As shown, the first seal 50 is sleeved on the outer periphery of the fixed plate 421 , the follower friction plate 41 , the movable plate 422 and the electromagnetic coil 423 , and can isolate the cavity between the fixed plate 421 and the electromagnetic coil 423 from the outside, thereby improving the sealing performance of the brake device 40 .

[0054] Specifically, Figure 1 As shown, the electromagnetic coil 423 is installed on the installation shaft 10 through the installation key 11. More specifically, the installation key 11 is a flat key.

[0055] It should be noted that the outer rotor motor also includes a hexagonal nut 81, which is arranged on the side of the electromagnetic coil 423 away from the follower friction plate 41. The number of the hexagonal nuts 81 can be two. The hexagonal nut 81 is against the electromagnetic coil 423, which can limit the position of the electromagnetic coil 423 on the mounting shaft 10. When the outer rotor 20 rotates, the electromagnetic coil 423 is prevented from being offset due to vibration, thereby improving the stability of the outer rotor motor.

[0056] In some embodiments of the present application, Figure 1 , Figure 4 and Figure 5 As shown, the outer rotor motor further includes a second sealing member 60 ; the second sealing member 60 is sleeved between the rotating shaft 30 and the fixed plate 421 .

[0057] In the embodiment of the present application, since the second seal 60 is arranged between the rotating shaft 30 and the fixed plate 421, the second seal 60 can isolate the cavity between the rotating shaft 30 and the fixed plate 421 from the outside world, preventing dust and water vapor from entering the brake device 40 through the gap between the rotating shaft 30 and the fixed plate 421, thereby further improving the sealing effect of the brake device 40.

[0058] The second sealing member 60 may be a sealing ring.

[0059] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 6 and Figure 7 As shown, the rotating shaft 30 includes a disc 31, a circular boss 32 is provided on the side of the disc 31 facing the electromagnetic coil 423, and a square boss 33 is provided on the side of the circular boss 32 facing the electromagnetic coil 423; the follower friction plate 41 has a square mounting hole 411, and the square mounting hole 411 can cooperate with the square boss 33.

[0060] In the embodiment of the present application, the square boss 33 of the rotating shaft 30 can be inserted into the square mounting hole 411 of the follower friction plate 41, so that the rotating shaft 30 can drive the follower friction plate 41 to rotate. Through the above arrangement, a more convenient and faster connection between the rotating shaft 30 and the follower friction plate 41 can be achieved. Compared with connecting the follower friction plate 41 to the rotating shaft 30 through a connecting piece, this arrangement can better achieve the rotating shaft 30 driving the follower friction plate 41 to rotate without damaging the parts.

[0061] Specifically, Figures 5 to 7 As shown, the disk 31 is connected to the inner end cover 22 of the outer rotor 20 via a third connecting member 82 , and the third connecting member 82 may be a screw.

[0062] In some embodiments of the present application, Figure 5 As shown, the circular boss 32 is opposite to the fixed plate 421 , and the second sealing member 60 is disposed between the outer circumferential surface of the circular boss 32 and the inner circumferential surface of the fixed plate 421 .

[0063] In the embodiment of the present application, the second sealing member 60 is disposed between the outer circumferential surface of the circular boss 32 and the inner circumferential surface of the fixed plate 421 , which can prevent external water vapor and dust from entering the brake device 40 from between the circular boss 32 and the fixed plate 421 , thereby improving the sealing performance of the brake device 40 .

[0064] It should be noted that if Figure 6 and Figure 7As shown, the diameter of the cross section of the circular disk 31 is greater than the diameter of the cross section of the circular boss 32 , and the diameter of the circular boss 32 is greater than the length of the diagonal line of the cross section of the square boss 33 .

[0065] In some embodiments of the present application, Figure 4 As shown, a plurality of recesses 4221 are provided on the outer periphery of the movable plate 422, and the brake device 40 also includes a connecting column 43, which is parallel to the axial direction of the mounting shaft 10, and the connecting column 43 is fixedly connected to the fixed plate 421, and a portion of the connecting column 43 is located in the recess 4221, and the movable plate 422 can move along the connecting column 43.

[0066] In the embodiment of the present application, the connecting column 43 can play a guiding role. When the elastic member 424 of the electromagnetic coil 423 pushes the movable plate 422 out, the movable plate 422 can move along the connecting column 43, preventing the movable plate 422 from deflecting during movement, thereby improving the stability during braking. The recess 4221 is arranged on the outer periphery of the movable plate 422, which makes it easier to process the movable plate 422 and improves the manufacturing efficiency of the movable plate 422.

[0067] Specifically, the connecting column 43 is fixedly connected to the fixed plate 421 through the first connecting member 431 .

[0068] In some embodiments of the present application, the second sealing member 60 is a skeleton oil seal.

[0069] In the embodiment of the present application, the skeleton oil seal is arranged between the rotating shaft 30 and the fixed plate 421, which can prevent external dust, impurities, etc. from entering the brake device 40. Compared with other types of seals, the design of the skeleton oil seal makes installation easier. The rigid metal shell helps to maintain the shape of the seal during installation, thereby reducing the risk of damage. In addition, compared with other seals, the skeleton oil seal also has excellent sealing performance, which can ensure the efficient operation of the outer rotor motor.

[0070] Specifically, the skeleton oil seal can adopt standard parts, which are usually used to prevent liquid or gas leakage and prevent dust and dirt from entering the interior of the equipment.

[0071] In the embodiment of the present application, the skeleton oil seal includes a lip 61, and lubricating oil is provided at the lip 61. When the rotating shaft 30 rotates at a high speed, an oil film is formed between the lip 61 and the rotating shaft 30. Under the action of the skeleton oil seal, the rigidity of the oil film just forms a crescent surface at the contact end of the oil film and the air, thereby achieving sealing between the rotating shaft 30 and the fixed plate 421, and preventing dust from entering the brake device 40. Since there is an oil film controlled by the oil seal edge between the skeleton oil seal and the rotating shaft 30, this oil film has fluid lubrication characteristics.

[0072] More specifically, Figure 1 and Figure 5As shown, the fixed plate 421 has a mounting groove 4211, and the skeleton oil seal is arranged in the mounting groove 4211, which reduces the space occupied by the skeleton oil seal in the outer rotor motor and makes the structure of the outer rotor motor more compact.

[0073] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 8 and Fig. 9 As shown, the first sealing member 50 is a rubber sleeve, which includes a retaining ring 51 and retaining edges 52 arranged on both sides of the retaining ring 51. The retaining ring 51 is perpendicular to the retaining edges 52. The retaining ring 51 abuts against the outer periphery of the fixed plate 421 and the electromagnetic coil 423, and the two retaining edges 52 abut against the outer side surfaces of the fixed plate 421 and the outer side surfaces of the electromagnetic coil 423 respectively.

[0074] In the embodiment of the present application, the rubber sleeve is elastically tensioned, which can prevent external dust from entering the brake device 40 from the periphery of the brake device 40, further improving the sealing of the brake device 40. In addition, the rubber sleeve includes a retaining ring 51 and retaining edges 52 arranged on both sides of the retaining ring 51, and the two retaining edges 52 are respectively against the outer side surface of the fixed plate 421 and the outer side surface of the electromagnetic coil 423. The elasticity of the rubber sleeve makes the fixed plate 421 and the electromagnetic coil 423 tend to approach each other, which can make the overall structure of the brake device 40 more compact and improve the stability of the brake device 40.

[0075] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 8 and Fig. 9 As shown, an avoidance groove 511 is provided on the inner wall of the retaining ring 51 , and the avoidance groove 511 is opposite to the position of the moving plate 422 .

[0076] In the embodiment of the present application, an avoidance groove 511 is provided on the inner wall of the retaining ring 51, which can prevent the movable plate 422 from interfering with the rubber sleeve when the movable plate 422 moves along the axial direction of the installation shaft 10, making the structure of the first sealing member 50 more reasonable and improving the stability of the braking process.

[0077] It should be noted that, in the axial direction of the mounting shaft 10 , the width of the avoidance groove 511 is greater than the width of the moving plate 422 .

[0078] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 8 and Fig. 9 As shown, the rib 52 away from the outer rotor 20 is provided with a wire outlet hole 521 , and the wire 4231 of the electromagnetic coil 423 is led out through the wire outlet hole 521 .

[0079] In the embodiment of the present application, the wire 4231 of the electromagnetic coil 423 can be led out through the wire outlet hole 521 in the retaining edge 52 of the rubber sleeve, which can make the routing of the wire 4231 smoother and avoid bending of the wire. The structure is more reasonable and is conducive to the stability of the wire transmission signal.

[0080] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 8 and Fig. 9 As shown, the rib 52 away from the outer rotor 20 is provided with a protrusion 522 , and the wire outlet hole 521 is provided on the protrusion 522 .

[0081] In the present application embodiment, Figure 1 , Figure 8 and Fig. 9 As shown, the size of the protrusion 522 is relatively large, and it is possible to better set the outlet holes 521 of different sizes, so that the wires 4231 of different sizes can be led out from the outlet holes 521, and the structural setting is more reasonable.

[0082] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. An outer rotor motor, characterized in that: include: An installation shaft (10), an outer rotor (20), a rotating shaft (30) and a brake device (40) arranged in sequence along the installation shaft (10), and a first sealing member (50); The outer rotor (20) is rotatably connected to one end of the mounting shaft (10); the brake device (40) and the outer rotor (20) are arranged in parallel on the mounting shaft (10); The rotating shaft (30) is sleeved on the mounting shaft (10), and is fixedly connected to the outer rotor (20), and rotates along with the outer rotor (20); The brake device (40) is sleeved on the mounting shaft (10); the brake device (40) comprises: a follower friction plate (41) and a brake assembly (42); the follower friction plate (41) is connected to the rotating shaft (30) and rotates with the rotating shaft (30); the brake assembly (42) is connected to the mounting shaft (10), and the brake assembly (42) is used to stop the follower friction plate (41) from rotating when braking; The first sealing member (50) is sleeved on the outer periphery of the brake device (40).

2. The outer rotor motor according to claim 1, characterized in that: The brake assembly (42) of the holding brake device (40) comprises: A fixed plate (421), a movable plate (422) and an electromagnetic coil (423) are arranged in parallel along the axial direction of the mounting shaft (10); the follower friction plate (41) is arranged between the fixed plate (421) and the movable plate (422); When the electromagnetic coil (423) is energized, the electromagnetic coil (423) attracts the moving plate (422); When the electromagnetic coil (423) is powered off, the movable plate (422) can move axially along the mounting shaft (10) to press the follower friction plate (41) so that the follower friction plate (41) stops rotating.

3. The outer rotor motor according to claim 2, characterized in that: The outer rotor motor further comprises a second sealing member (60); The second sealing member (60) is sleeved between the rotating shaft (30) and the fixed plate (421).

4. The outer rotor motor according to claim 3, characterized in that: The rotating shaft (30) comprises a circular disk (31), a circular boss (32) is provided on the side of the circular disk (31) facing the electromagnetic coil (423), and a square boss (33) is provided on the side of the circular boss (32) facing the electromagnetic coil (423); The follower friction plate (41) has a square mounting hole (411), and the square mounting hole (411) can cooperate with the square boss (33).

5. The outer rotor motor according to claim 4, characterized in that: The circular boss (32) and the fixed plate (421) are located opposite to each other, and the second sealing member (60) is arranged between the outer peripheral surface of the circular boss (32) and the inner peripheral surface of the fixed plate (421).

6. The outer rotor motor according to claim 3, characterized in that: The outer periphery of the movable plate (422) is provided with a plurality of recesses (4221), and the brake device (40) further comprises a connecting column (43), wherein the connecting column (43) is parallel to the axial direction of the mounting shaft (10), the connecting column (43) is fixedly connected to the fixed plate (421), and a portion of the connecting column (43) is located in the recess (4221), and the movable plate (422) can move along the connecting column (43).

7. The outer rotor motor according to any one of claims 3 to 6, characterized in that: The second sealing member (60) is a skeleton oil seal.

8. The outer rotor motor according to any one of claims 2 to 6, characterized in that: The first sealing member (50) is a rubber sleeve, which comprises a retaining ring (51) and retaining edges (52) arranged on both sides of the retaining ring (51), the retaining ring (51) is perpendicular to the retaining edges (52), the retaining ring (51) abuts against the outer periphery of the fixed plate (421) and the electromagnetic coil (423), and the two retaining edges (52) respectively abut against the outer side surface of the fixed plate (421) and the outer side surface of the electromagnetic coil (423).

9. The outer rotor motor according to claim 8, characterized in that: An escape groove (511) is provided on the inner wall of the retaining ring (51), and the escape groove (511) is located opposite to the moving plate (422).

10. The outer rotor motor according to claim 9, characterized in that: A wire outlet hole (521) is provided on the rib (52) away from the outer rotor (20), and the wire of the electromagnetic coil (423) is led out through the wire outlet hole (521).

11. The outer rotor motor according to claim 10, characterized in that: A protruding portion (522) is provided on the retaining edge (52) away from the outer rotor (20), and the wire outlet hole (521) is provided on the protruding portion (522).

Images