An outer rotor motor

Abstract

The present invention belongs to the technical field of motors, and specifically is an outer rotor motor, comprising a stator bracket, a stator base is mounted on the stator bracket, a stator core is mounted on the stator base, an outer rotor casing is mounted on the stator base, and a magnetic steel is mounted on the outer rotor casing; a ventilation hole is opened on the outer rotor casing, an air guide vane is mounted at the ventilation hole, and the air guide vane is fixed to the outer rotor casing through an adjustment plate; the adjustment plate is made of a bimetallic strip or a memory metal, and the adjustment plate drives the air guide vane to rotate toward the stator core; the present invention can be provided with ventilation holes and air guide vanes that can adjust the opening by themselves, so as to accelerate the air flow in the motor and perform forced ventilation and heat dissipation. At the same time, the ventilation holes and air guide vanes will not increase the structural complexity and weight too much while ensuring the ventilation and heat dissipation effect, so as to ensure that the size of the outer rotor motor is good and facilitate the normal use of the outer rotor motor.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, in particular to an outer rotor motor. Background Art

[0002] The motor is one of the essential components of various electromechanical products. Among them, the outer rotor motor has the advantages of compact structure and high material utilization. It is widely used in exhaust equipment, air-conditioning units, air purification systems and cooling equipment.

[0003] The outer shell of an ordinary outer rotor motor takes into account the limitations of its own rotation and working environment. Unlike the inner rotor motor, the outer shell has a grid structure to increase the heat dissipation area and a built-in fan to assist in heat dissipation. Therefore, under normal circumstances, the heat emitted by the motor can be dissipated to the outside. However, when the motor works at a high load for a long time, the temperature often cannot be lowered in time. In severe cases, it may even affect the safety of staff and equipment. Such a structure has many parts, and the increase in parts makes the overall structure bulky, which is not conducive to external use.

[0004] The existing outer rotor motor heat dissipation structure is usually provided with a synchronously rotating impeller. During the operation of the motor, the impeller rotates together with the rotor to generate a heat dissipation airflow. At the same time, the impeller and the rotor are arranged side by side. In the axial direction, the impeller blades are close to the rotor casing but do not overlap. The rotation of the rotor drives the impeller to rotate, generating a heat dissipation airflow. However, the heat dissipation effect of this heat dissipation method still needs to be improved, and it will increase the size of the outer rotor motor, affecting its installation and use. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, ventilation holes and air guides that can adjust their openings by themselves are provided to speed up the air flow in the motor and perform forced ventilation and heat dissipation on the inside of the motor. At the same time, the ventilation holes and air guides will not increase the structural complexity and weight too much while ensuring the ventilation and heat dissipation effects, thereby ensuring that the size of the outer rotor motor is good and facilitating the normal use of the outer rotor motor. The present invention proposes an outer rotor motor.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: an outer rotor motor described in the present invention comprises a stator bracket, a stator base is installed on the stator bracket, a stator core and a control board are installed on the stator base, the coil on the stator core is electrically connected to the control board, a rotating shaft is installed through the stator base, an outer rotor casing is installed on the rotating shaft, a fixing seat is installed on the inner wall of the outer rotor casing, a magnetic steel is installed on the fixing seat, and the outer rotor casing is sleeved outside the stator core;

[0007] A ventilation hole is opened on the end surface of the outer rotor housing, and an air guide vane is installed at the ventilation hole. The air guide vane is located on the inner wall of the outer rotor housing, and the air guide vane is fixed to the outer rotor housing only through an adjustment plate;

[0008] The adjustment plate is made of bimetallic strips or memory metal, and the adjustment plate drives the air guide vanes to rotate toward the stator core. There is a gap between the lower end surface of the outer rotor housing and the upper surface of the stator bracket.

[0009] Preferably, fins are provided on the adjustment plate, and the fins are located on the side of the adjustment plate facing the stator core. The fins on the adjustment plate are divided into two groups, and the fins are respectively provided at both ends of the adjustment plate.

[0010] Preferably, the fins at both ends of the adjustment plate correspond one to one, the opposite end surfaces of the fins are contact ends, and when the adjustment plate drives the air guide plate to rotate, the contact ends of the two groups of fins abut against each other.

[0011] Preferably, a retaining ring is installed on the stator bracket, the outer diameter of the retaining ring is smaller than the inner diameter of the outer rotor housing, a filter is installed on the retaining ring, and fluff is arranged on the outer surface of the filter, and the inner surface of the outer rotor housing is in contact with the fluff.

[0012] Preferably, the filter screen is slidably mounted on a retaining ring, a magnetic block is mounted on the filter screen, and there is a magnetic repulsion force between the magnetic block and the magnetic steel.

[0013] Preferably, the surface of the air guide plate is covered with an elastic layer.

[0014] Preferably, grid grooves are provided on the outer side surface of the stator base.

[0015] Preferably, a partition mesh is installed at the opening of the grid slot beyond the stator core.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The outer rotor motor described in the present invention is provided with ventilation holes, air guides, adjustment plates and fins, so that the adjustment plates can automatically adjust the openings of the ventilation holes and air guides according to the temperature inside the motor, forcing the air in the motor to be discharged, accelerating the flow of air in the motor, and ventilating and cooling the motor. In addition, the ventilation holes and air guides will not increase excessive parts, the complexity of the motor structure and the weight of the motor while ensuring the ventilation and heat dissipation effects, and can ensure that the size of the outer rotor motor is good, facilitating the normal use of the motor.

[0018] 2. The outer rotor motor described in the present invention intercepts and filters the air entering the motor by setting a retaining ring, a filter screen, fluff and a magnetic block, thereby reducing the amount of dust and impurities entering the motor and avoiding excessive accumulation of dust and impurities in the motor, which would affect the normal use of the motor. At the same time, when the outer rotor motor is running, the magnetic block will be subjected to the magnetic repulsion of the magnetic steel, causing the filter screen to vibrate up and down, thereby promoting the detachment of dust attached to the filter screen, avoiding clogging of the filter screen, affecting the air flow in the motor, and improving the ventilation and heat dissipation effect of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 This is a front view of the outer rotor motor of the present invention when the ventilation hole is not opened;

[0021] Figure 2 This is a front view of the outer rotor motor of the present invention when the ventilation hole is opened;

[0022] Figure 3 is a cross-sectional view of the outer rotor motor of the present invention;

[0023] Figure 4 It is a front view of the stator base and the stator core in the outer rotor motor of the present invention;

[0024] Figure 5 It is a structural schematic diagram of a stator bracket and a stator base in an outer rotor motor of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the outer rotor housing when the ventilation hole in the outer rotor motor of the present invention is not opened;

[0026] Figure 7 is a schematic structural diagram of the outer rotor housing when the ventilation hole in the outer rotor motor of the present invention is opened;

[0027] Figure 8 This is a front view of the adjustment plate in the outer rotor motor of the present invention when it is not deformed;

[0028] Fig. 9 This is a front view of the outer rotor motor of the present invention when the adjustment plate has been deformed;

[0029] Fig.10 yes Figure 3 A partial enlarged view of the middle part;

[0030] In the figure: stator bracket 1, retaining ring 11, outer rotor housing 2, rotating shaft 21, ventilation hole 22, air guide plate 23, adjustment plate 24, fin 241, contact end 242, stator base 3, grid slot 31, partition net 32, stator core 4, control board 41, fixing base 5, magnetic steel 51, filter screen 6, magnetic block 61. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figures 1 to 10 As shown, an outer rotor motor of the present invention comprises a stator bracket 1, a stator base 3 is mounted on the stator bracket 1, a stator core 4 and a control board 41 are mounted on the stator base 3, the coil on the stator core 4 is electrically connected to the control board 41, a rotating shaft 21 is installed through the stator base 3, an outer rotor housing 2 is installed on the rotating shaft 21, a fixing seat 5 is installed on the inner wall of the outer rotor housing 2, a magnetic steel 51 is installed on the fixing seat 5, and the outer rotor housing 2 is sleeved outside the stator core 4;

[0033] A ventilation hole 22 is provided on the end surface of the outer rotor housing 2, and an air guide plate 23 is installed at the ventilation hole 22. The air guide plate 23 is located on the inner wall of the outer rotor housing 2, and the air guide plate 23 is only installed and fixed on the outer rotor housing 2 through an adjustment plate 24;

[0034] The adjustment plate 24 is made of bimetallic strips or memory metal, and the adjustment plate 24 drives the air guide plate 23 to rotate toward the stator core 4. There is a gap between the lower end surface of the outer rotor housing 2 and the upper surface of the stator bracket 1.

[0035] When the outer rotor motor is running, heat is generated inside the motor. When the motor runs for a long time and the heat inside the motor has no time to dissipate, the temperature inside the motor will gradually increase, thereby gradually increasing the temperature of the adjustment plate 24 inside the motor. At the same time, since the adjustment plate 24 is made of bimetallic strips or memory metal, when the temperature of the adjustment plate 24 exceeds the set threshold, that is, when the motor is at a suitable operating temperature, the adjustment plate 24 will begin to deform, so that the adjustment plate 24 drives the air guide plate 23 to rotate, and the closed ventilation hole 22 is opened;

[0036] At the same time, after the air guide piece 23 rotates and the ventilation hole 22 is opened, as the outer rotor housing 2 in the outer rotor motor rotates, the air inside the motor will be pushed by the air guide piece 23 and discharged to the outside of the outer rotor motor, thereby allowing the outside air to enter the motor from the gap between the lower end of the outer rotor housing 2 and the upper surface of the stator bracket 1. After that, the air in the motor will flow from bottom to top, and then the air in the motor will be discharged from the ventilation hole 22 by the air guide piece 23, thereby forming an air circulation inside the motor, quickly dissipating the heat generated in the motor, ensuring that the temperature of the motor is always at a suitable working temperature, avoiding excessive internal temperature of the motor, causing damage to the motor, burning, and causing safety accidents;

[0037] At the same time, since the deformation degree of the adjustment plate 24 increases with the increase of temperature, the adjustment plate 24 drives the rotation of the air guide piece 23, and can be adaptively adjusted according to the changes in the operating power of the motor and the temperature inside the motor, so as to increase the opening area of ​​the ventilation hole 22 when the motor is in high power and long-term operation, accelerate the air flow inside the motor, and improve the heat dissipation effect of the heat accumulated inside the motor. At the same time, when the motor stops running and the heat generated during the operation of the motor is dissipated, the adjustment plate 24 will gradually return to the initial position, thereby driving the air guide piece 23 to close the ventilation hole 22, reduce the external dust and impurities from entering the motor, and avoid the accumulation of dust and impurities in the motor, which affects the normal operation of the motor;

[0038] At the same time, since the heat in the motor is dissipated or the ventilation holes 22 on the motor are sealed by the combination of the air guide piece 23 and the ventilation hole 22, the number of additional parts in the motor can be effectively reduced. Moreover, the ventilation holes 22 and the air guide piece 23 are provided on the outer rotor motor, which will not significantly increase the structural complexity of the motor or increase the weight too much, and can facilitate the assembly and production of the motor and the normal use of the motor.

[0039] At the same time, since the air guide blades 23 are also in the gap between the outer rotor housing 2 and the stator core 4 when rotating, the space inside the motor can be fully utilized to ensure the simplicity of the external structure of the motor, thereby making the structure of the motor simple and compact, which helps to reduce the overall volume and weight of the outer rotor motor, thereby increasing the scope of use of the motor.

[0040] As an embodiment of the present invention, the adjustment plate 24 is provided with fins 241, and the fins 241 are located on the side of the adjustment plate 24 facing the stator core 4. The fins 241 on the adjustment plate 24 are divided into two groups, and the fins 241 are respectively arranged at both ends of the adjustment plate 24;

[0041] Since there is a gap between the side of the outer rotor housing 2 facing the stator core 4 and the stator core 4, after heat is generated in the stator core 4, the heat will not be transferred to the adjustment plate 24 in the outer rotor housing 2, so that there will be a difference between the temperature on the adjustment plate 24 and the temperature on the stator core 4, that is, the driving of the air guide plate 23 by the adjustment plate 24 has a lag relative to the temperature change of the stator core. At the same time, since the area of ​​the adjustment plate 24 is relatively small, it will also make it difficult for the heat generated during the operation of the motor to be transferred to the adjustment plate 24 or the speed of heat transfer is relatively slow. Therefore, fins 241 are installed on the surface of the adjustment plate 24 to increase the area of ​​heat transfer on the adjustment plate 24, thereby accelerating the speed of heat generated during the operation of the motor to be transferred to the adjustment plate 24, that is, improving the timeliness of the rotation of the air guide plate 23 driven by the adjustment plate 24 relative to the temperature change on the stator core 4, so that the ventilation hole 22 can be opened in time to accelerate the air flow in the motor, dissipate the heat in the motor, and avoid excessive temperature in the motor, resulting in motor damage;

[0042] At the same time, since the adjustment plate 24 will bend when the temperature rises, the fins 241 on the adjustment plate 24 are arranged in two groups to prevent the fins 241 from being interconnected as a whole, which would affect or interfere with the bending deformation of the adjustment plate 24.

[0043] As an embodiment of the present invention, the fins 241 at both ends of the adjustment plate 24 correspond to each other one by one, and the opposite end surfaces of the fins 241 are contact ends 242. When the adjustment plate 24 drives the air guide plate 23 to rotate, the contact ends 242 of the two groups of fins 241 abut against each other.

[0044] After the temperature of the adjustment plate 24 rises and the plate is bent and deformed, the adjustment plate 24 will drive the air guide vane 23 to rotate, so that the air guide vane 23 will discharge the air in the motor from the ventilation hole 22 to the outside during the rotation of the outer rotor housing 2. In this process, the air guide vane 23 will be subjected to the reaction force of the discharged air, and the air guide vane 23 is installed on the inner wall of the outer rotor housing 2 through the adjustment plate 24, so that the force on the adjustment plate 24 will be relatively large, which may easily cause the adjustment plate 24 to continue to deform under the action of external force, so that the air guide vane 23 cannot push the air and discharge the air, thereby affecting the heat dissipation in the motor. Therefore, the opposite end faces of the two sets of fins 241 are set so that the adjustment plate When 24 is bent and deformed, the contact ends 242 on the fins 241 can contact and abut each other, so that the fins 241 can reinforce the deformed and bent adjustment plate 24, improve the strength of the already bent adjustment plate 24, and prevent the adjustment plate 24 from continuing to deform under the force exerted on the air guide plate 23, thereby affecting the flow of air in the motor and causing safety hazards. At the same time, the mutual abutment between the two groups of fins 241 can also limit the bending deformation of the adjustment plate 24, and prevent the adjustment plate 24 from continuing to bend and deform as the temperature in the motor increases, causing the air guide plate 23 to excessively rotate and open under the action of the adjustment plate 24, causing interference between the air guide plate 23 and the stator base 3 and the stator core 4, resulting in damage to the motor.

[0045] As an embodiment of the present invention, a retaining ring 11 is installed on the stator bracket 1, the outer diameter of the retaining ring 11 is smaller than the inner diameter of the outer rotor housing 2, a filter screen 6 is installed on the retaining ring 11, and fluff is arranged on the outer surface of the filter screen 6, and the inner surface of the outer rotor housing 2 is in contact with the fluff;

[0046] After the adjusting plate 24 drives the air guide plate 23 to rotate and opens the ventilation hole 22, the air in the motor will be driven and discharged from the ventilation hole 22 from bottom to top. In this process, the outside air will enter the motor from the gap between the lower end of the outer rotor casing 2 and the upper surface of the stator bracket 1, and the dust and impurities carried in the outside air will also enter the inside of the motor. Therefore, a filter 6 is installed on the retaining ring 11 on the stator bracket 1, and the gap between the retaining ring 11 and the outer rotor casing 2 is blocked by the filter 6, so that the air entering the motor is filtered, and the amount of dust and impurities carried by the outside air into the motor is avoided or reduced, and the dust and impurities in the motor are avoided from accumulating too much, resulting in damage to the motor. At the same time, due to the high-speed rotation of the outer rotor casing 2, by arranging fluff on the outer side of the filter 6, the fluff on the filter 6 is in contact with the inner wall of the outer rotor casing 2, thereby reducing the friction between the outer rotor casing 2 and the filter 6, avoiding direct friction and contact between the two, affecting the normal operation of the motor and extending the service life of the filter 6.

[0047] As an embodiment of the present invention, the filter screen 6 is slidably mounted on the retaining ring 11, and a magnetic block 61 is mounted on the filter screen 6. There is a magnetic repulsion between the magnetic block 61 and the magnetic steel 51;

[0048] Since the magnet 51 is installed on the outer rotor housing 2, and the distance between the magnet 51 and the magnetic block 61 is relatively close, the magnetic force emitted by the magnet 51 will produce a magnetic effect on the magnetic block 61. Therefore, during the rotation of the outer rotor housing 2, the magnetic block 61 on the filter 6 will be periodically subjected to the magnetic repulsion of the magnet 51, causing the filter 6 to slide downward on the retaining ring 11. At the same time, since the air in the motor is discharged outward from the ventilation hole 22 and the outside air is drawn into the motor, the filter 6 will move upward under the action of the drawn air. Therefore, combined with the action of the drawn air on the filter 6 and the magnetic repulsion of the magnet 51, the filter 6 will vibrate up and down, thereby promoting the falling off of dust and impurities attached to the surface of the filter 6, avoiding clogging of the filter 6 and affecting the outside air from entering the motor, resulting in excessive internal temperature of the motor, resulting in overheating and damage to the motor.

[0049] As an embodiment of the present invention, the surface of the air guide piece 23 is covered with an elastic layer;

[0050] After the motor stops running, the air guide piece 23 will return to its original position and close the vent 22. During this process, the gap between the air guide piece 23 and the vent 22 is filled by the elastic layer on the surface of the air guide piece 23 to prevent the air guide piece 23 from being unable to fully fit onto the vent 22, resulting in a gap between the air guide piece 23 and the vent 22. Dust and impurities in the outside air can penetrate into the motor through the gap, causing dust and impurities in the motor to gradually accumulate, affecting the normal use and service life of the motor.

[0051] As an embodiment of the present invention, a grid slot 31 is provided on the outer surface of the stator base 3;

[0052] After the air guide piece 23 rotates and the ventilation hole 22 is opened, the air flow in the motor is accelerated. At the same time, by opening the grid slot 31 on the stator base 3, the air flowing in the motor will also pass through the grid slot 31, thereby accelerating the removal and dissipation of the heat accumulated on the inner wall of the stator core 4, increasing the area of ​​the stator core 4 for heat dissipation, and improving the heat dissipation effect. At the same time, it can also avoid or reduce the heat accumulation of the stator core 4 on the stator base 3 and the rotating shaft 21 in the stator base 3, thereby reducing the temperature in the motor, improving the effect of forced and forced heat dissipation of the heat in the motor, and preventing the motor from overheating, causing damage to the motor or accelerating aging.

[0053] As an embodiment of the present invention, a partition net 32 ​​is installed at the opening of the grid slot 31 beyond the stator core 4;

[0054] Since the grid slot 31 is surrounded by the stator core 4 and the opening of the grid slot 31 is relatively small and not easy to be disassembled and cleaned, a partition net 32 ​​is installed on the grid slot 31 beyond the opening surrounded by the stator core 4 to intercept and filter the air passing through the grid slot 31 in the motor, thereby avoiding the accumulation of dust and impurities in the grid slot 31, which in turn makes it difficult to clean the dust and impurities in the grid slot 31 and affects the effect of the grid slot 31 on dissipating the accumulated heat in the stator base 3 and the stator core 4.

[0055] The specific workflow is as follows:

[0056] When the outer rotor motor runs for a long time and the heat in the motor has no time to dissipate, the temperature inside the motor gradually increases, so that the temperature of the adjustment plate 24 in the motor also gradually increases, causing the adjustment plate 24 made of bimetallic strips or memory metal to begin to deform, so that the adjustment plate 24 drives the air guide plate 23 to rotate, and the closed ventilation hole 22 is opened;

[0057] At the same time, after the air guide piece 23 rotates and the ventilation hole 22 is opened, as the outer rotor housing 2 rotates, the air inside the motor is pushed by the air guide piece 23 and discharged to the outside of the outer rotor motor, and the outside air enters the motor from the gap between the lower end of the outer rotor housing 2 and the upper surface of the stator bracket 1, forming an air circulation inside the motor;

[0058] At the same time, the adjustment plate 24 drives the air guide piece 23 to rotate, and can be adaptively adjusted according to the operating power of the motor and the changes in the temperature inside the motor, so as to increase the opening area of ​​the ventilation hole 22 when the motor is in high power and long-term operation. At the same time, when the motor stops running and the heat generated by the running of the motor is completely dissipated, the adjustment plate 24 will gradually return to the initial position, thereby driving the air guide piece 23 to close the ventilation hole 22;

[0059] At the same time, due to the combination of the air guide piece 23 and the ventilation hole 22, the structural complexity of the motor will not be greatly increased, and the weight will not be increased too much;

[0060] At the same time, since the air guide blade 23 is also in the gap between the outer rotor housing 2 and the stator core 4 when rotating, the space inside the motor can be fully utilized to ensure the simplicity of the motor's external structure and the simple and compact structure of the motor;

[0061] Fins 241 are installed on the surface of the adjustment plate 24 to increase the heat transfer area on the adjustment plate 24, thereby accelerating the speed at which the heat generated during operation of the motor is transferred to the adjustment plate 24, so that the ventilation holes 22 can be opened in time to accelerate the air flow in the motor and dissipate the heat;

[0062] At the same time, since the adjustment plate 24 will bend when the temperature rises, the fins 241 on the adjustment plate 24 are arranged in two groups to prevent the fins 241 from being connected to each other as a whole, which would affect or interfere with the bending deformation of the adjustment plate 24;

[0063] The end surfaces of the two groups of fins 241 are arranged opposite to each other, so that when the adjustment plate 24 is bent and deformed, the contact ends 242 on the fins 241 can contact and abut each other, so that the fins 241 can strengthen the deformed and bent adjustment plate 24, and prevent the adjustment plate 24 from continuing to deform due to the force exerted on the air guide plate 23, thereby affecting the flow of air in the motor. At the same time, the bending deformation of the adjustment plate 24 is limited, and the adjustment plate 24 is prevented from continuing to bend and deform as the temperature in the motor increases.

[0064] A filter screen 6 is installed on the retaining ring 11, and the gap between the retaining ring 11 and the outer rotor housing 2 is blocked by the filter screen 6 to filter the air entering the motor. At the same time, by arranging fluff on the outer surface of the filter screen 6, the fluff on the filter screen 6 is in contact with the inner wall of the outer rotor housing 2, thereby reducing the friction between the outer rotor housing 2 and the filter screen 6, and avoiding direct friction and contact between the two.

[0065] During the rotation of the outer rotor housing 2, the magnetic block 61 on the filter 6 will be periodically subjected to the magnetic repulsion of the magnetic steel 51, causing the filter 6 to slide downward on the retaining ring 11. At the same time, since the air in the motor is discharged from the ventilation hole 22 and the outside air is drawn into the motor, the filter 6 will move upward under the action of the drawn air. Therefore, the filter 6 will vibrate up and down in combination with the action of the drawn air and the magnetic repulsion of the magnetic steel 51, thereby promoting the shedding of dust and impurities attached to the surface of the filter 6.

[0066] After the motor stops running, the air guide piece 23 will return to its original position and close the vent 22. During this process, the gap between the air guide piece 23 and the vent 22 is filled by the elastic layer on the surface of the air guide piece 23 to prevent the air guide piece 23 from being fully attached to the vent 22, so that there is a gap between the air guide piece 23 and the vent 22, so that dust and impurities in the outside air can penetrate into the motor through the gap.

[0067] At the same time, by opening the grid slots 31 on the stator base 3, the air flowing in the motor will also pass through the grid slots 31, which will accelerate the removal and dissipation of the heat accumulated on the inner wall of the stator core 4, increase the area of ​​the stator core 4 for heat dissipation, and improve the heat dissipation effect;

[0068] A partition net 32 ​​is installed on the grid slot 31 beyond the opening surrounded by the stator core 4 to intercept and filter the air passing through the grid slot 31 in the motor to avoid accumulation of dust and impurities in the grid slot 31 .

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An outer rotor motor, comprising a stator support (1), a stator base (3) being mounted on the stator support (1), a stator core (4) and a control board (41) being mounted on the stator base (3), a coil on the stator core (4) being electrically connected to the control board (41), a rotating shaft (21) being mounted through the stator base (3), an outer rotor housing (2) being mounted on the rotating shaft (21), a fixing seat (5) being mounted on the inner wall of the outer rotor housing (2), a magnetic steel (51) being mounted on the fixing seat (5), and the outer rotor housing (2) being sleeved outside the stator core (4); Features: A ventilation hole (22) is provided on the end surface of the outer rotor casing (2), an air guide plate (23) is installed at the ventilation hole (22), the air guide plate (23) is located on the inner wall of the outer rotor casing (2), and the air guide plate (23) is fixed to the outer rotor casing (2) only by an adjustment plate (24); The adjustment plate (24) is made of a bimetallic sheet or a memory metal, and the adjustment plate (24) drives the air guide plate (23) to rotate toward the stator core (4), and a gap exists between the lower end surface of the outer rotor housing (2) and the upper surface of the stator bracket (1); The adjusting plate (24) is provided with fins (241), the fins (241) are located on the side of the adjusting plate (24) facing the stator core (4), the fins (241) on the adjusting plate (24) are divided into two groups, and the fins (241) are respectively arranged at two ends of the adjusting plate (24); The fins (241) at both ends of the adjustment plate (24) correspond one to one, and the opposite end surfaces of the fins (241) are contact ends (242). When the adjustment plate (24) drives the air guide plate (23) to rotate, the contact ends (242) of the two groups of fins (241) abut against each other.

2. The outer rotor motor according to claim 1, characterized in that: A retaining ring (11) is mounted on the stator support (1), the outer diameter of the retaining ring (11) being smaller than the inner diameter of the outer rotor housing (2), a filter screen (6) is mounted on the retaining ring (11), and fluff is arranged on the outer surface of the filter screen (6), and the inner surface of the outer rotor housing (2) is in contact with the fluff.

3. The outer rotor motor according to claim 2, characterized in that: The filter screen (6) is slidably mounted on the retaining ring (11); a magnetic block (61) is mounted on the filter screen (6); and a magnetic repulsive force exists between the magnetic block (61) and the magnetic steel (51).

4. The outer rotor motor according to claim 2, characterized in that: The surface of the air guide piece (23) is covered with an elastic layer.

5. The outer rotor motor according to claim 1, characterized in that: The outer side surface of the stator base (3) is provided with grid grooves (31).

6. The outer rotor motor according to claim 5, characterized in that: A partition net (32) is installed at the opening of the grid slot (31) beyond the stator core (4).

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