Brushless motor with starting protection function

Abstract

The invention discloses a brushless motor with a starting protection function, and relates to the technical field of brushless motors. The motor comprises a motor shell, one end of the motor shell is rotatably connected with a motor main shaft, one end of the motor main shaft penetrates through the interior of the motor shell and is fixedly connected with a rotor, the inner side of the motor shell is uniformly and fixedly connected with a plurality of stators, one end of each stator is wound with a winding, and the inner side of each stator is fixedly connected with a Hall sensor. Accurate position information of the rotor is continuously fed back to the controller through the Hall sensor, the controller dynamically adjusts driving signals sent to the stator and the winding according to the information, meanwhile, the current and voltage detection element is arranged, and the working state of the motor is monitored in real time through the voltage detection circuit and the current detection circuit. And when it is monitored that the voltage is abnormal or the current exceeds a safety threshold value, a power supply is rapidly cut off by using an MOSFET switching tube so as to prevent the motor from being damaged due to overload or voltage fluctuation.

Description

Technical Field

[0001] The present application relates to the technical field of brushless motors, and in particular to a brushless motor with a startup protection function. Background Art

[0002] With the continuous advancement of science and technology and the rapid development of industrial automation, motors, as the core components of electrical transmission systems, play an increasingly critical role in modern industry and daily life. There are many types of motors, but brushless motors (BLDC) have gradually replaced traditional motors in many fields due to their unique advantages and have become an important force in promoting technological innovation. The design of brushless motors abandons the carbon brush and commutator structure in traditional motors and adopts electronic commutation technology instead. This innovation significantly improves the performance of the motor. First, brushless motors are more efficient because the friction loss between the carbon brush and the commutator is eliminated, reducing energy loss. Secondly, since there is no dust and noise generated by carbon brush wear, brushless motors are quieter during operation, which is especially important for application scenarios that require a low-noise environment, such as household appliances and medical equipment. In addition, the maintenance cost of brushless motors is also greatly reduced because the electronic commutation system reduces mechanical wear, extends the service life of the motor, and reduces the need for regular maintenance and replacement of parts.

[0003] With the application of new materials, new processes and new control technologies, the performance of brushless motors is constantly improving. For example, the use of high-performance permanent magnet materials can further improve the efficiency and power density of the motor, while advanced control algorithms can optimize the starting and operating performance of the motor and improve the energy efficiency of the system. Although brushless motors have many advantages, their performance during the startup process is not satisfactory. During the startup phase, brushless motors are susceptible to voltage fluctuations and current surges, which may cause startup failures or even motor damage.

[0004] To address these issues, existing technologies typically rely on complex electronic controllers to implement startup protection. These controllers protect the motor from damage by monitoring the motor's startup status and cutting off power when an abnormality is detected. However, these solutions are often costly and in some cases do not react fast enough to provide timely protection. Summary of the invention

[0005] The purpose of this application is to solve the problem that the existing technology usually relies on complex electronic controllers to implement startup protection, which is low in efficiency and high in cost. This application provides a brushless motor with startup protection function.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A brushless motor with a startup protection function comprises a motor housing, one end of the motor housing is rotatably connected to a motor main shaft, one end of the motor main shaft passes through the interior of the motor housing and is fixedly connected to a rotor, a plurality of stators are evenly and fixedly connected to the inner side of the motor housing, a winding is wound around one end of the stator, a Hall sensor is fixedly connected to the inner side of the stator, an outer expansion bin is opened at one end of the motor housing, a circuit board is fixedly connected to the interior of the outer expansion bin, one end of the circuit board is fixedly connected to a controller, and one end of the circuit board is fixedly connected to a MOSFET switch tube, one end of the winding is fixedly connected to a current and voltage detection element, and a heat dissipation component is installed at one end of the motor housing.

[0007] By adopting the above technical solution, by setting the Hall sensor and the controller, MOSFET switch tube, and current and voltage detection element for coordinated use, it is convenient to continuously feed back the precise position information of the rotor to the controller through the Hall sensor when starting the brushless motor, and enable the controller to dynamically adjust the drive signal sent to the stator and the winding according to this information. At the same time, the current and voltage detection element is set to monitor the working state of the motor in real time through the voltage detection circuit and the current detection circuit, and when the voltage is abnormal or the current exceeds the safety threshold, the MOSFET switch tube is used to quickly cut off the power supply to prevent the motor from being damaged due to overload or voltage fluctuation. In this way, through such fine control and real-time monitoring, the brushless motor can not only achieve fast and reliable startup, but also maintain optimal performance during operation, effectively reducing the cost and complexity of the brushless motor startup protection, improving the reaction speed and reliability of the protection, and ensuring the stable startup and operation of the motor under various harsh conditions.

[0008] Furthermore, the heat dissipation assembly includes a secondary shaft fixedly connected to one end of the motor main shaft, one end of the secondary shaft extends to the outside of the motor housing and is fixedly connected to a fan blade, a plurality of heat dissipation fins are evenly and fixedly connected to the surface of the motor housing, one end of the motor housing is fixedly connected to a protective cover adapted to the winding, and the fan blades are installed inside the protective cover.

[0009] By adopting the above technical solution, by arranging the coordinated use of the fan blades, the heat dissipation fins and the protective cover, when the main shaft of the driving motor drives the secondary shaft to rotate, the secondary shaft drives the fan blades to draw air to accelerate through the protective cover and blow toward the surface of the motor housing, and realize contact heat exchange with the heat dissipation fins and the surface of the motor housing, so as to reduce the surface temperature of the motor housing, thereby effectively improving the heat dissipation efficiency and operation stability of the brushless motor.

[0010] Furthermore, the protective cover is configured as a bucket-shaped induced draft cover.

[0011] By adopting the above technical solution, by setting the protective cover as a bucket-shaped air induced draft cover, the air drawn by the fan blades can expand along the guiding direction of the inner wall of the protective cover when passing through the inside of the protective cover, thereby increasing the diffusion range of the air drawn by the fan blades, allowing the air to be smoothly guided between multiple cooling fins, thereby improving the practicality of the device.

[0012] Furthermore, one end of the protective cover is fixedly connected with a filter screen.

[0013] By adopting the above technical solution, a filter net is set up to facilitate filtering of the air passing through the inside of the protective cover, thereby intercepting foreign matter such as dust in the air, reducing the problem of dust sticking to the surface of the motor casing, which leads to reduced heat dissipation efficiency of the motor casing, and improving the practicability of the device.

[0014] Furthermore, a vibration slide rod is slidably connected to the middle section of the filter screen, one end of the vibration slide rod passes through the filter screen and is fixedly connected to a transmission disk, one end of the transmission disk is symmetrically fixedly connected to a knocking block, and one end of the secondary shaft is equipped with a transmission component for driving the knocking block to hit the filter screen along the length direction of the vibration slide rod.

[0015] By adopting the above technical scheme, by setting the driving component for use with the vibration slide bar, the transmission disk, and the knocking block, when the main shaft of the driving motor drives the secondary shaft to rotate, the secondary shaft pushes the transmission disk to drive the knocking block to reciprocate along the length direction of the vibration slide bar, and forms a reciprocating collision with one end of the filter screen, so that the dust adhered to the surface of the filter screen is vibrated and falls off, thereby reducing the adhesion of dust on the surface of the filter screen, reducing the filtering effect of the filter screen, and improving the practicability of the device.

[0016] Furthermore, the transmission assembly includes an abutment symmetrically arranged at one end of the secondary shaft, one end of the transmission disc is symmetrically fixedly connected with a protrusion adapted to the abutment, one end of the vibration slide rod is sleeved with a return spring, and the return spring is installed between the transmission disc and the filter.

[0017] By adopting the above technical scheme, by setting the cooperation of the resistance piece, the protrusion and the return spring, when the driving countershaft drives the resistance piece to rotate, the resistance piece and the protrusion form a reciprocating resistance, and push the transmission plate along the length direction of the vibration slide bar to squeeze the return spring to produce a contraction deformation, and then use the rebound characteristics of the return spring to push the transmission plate to reset along the length direction of the vibration slide bar, so that it is easy to drive the transmission plate to drive the knocking block to reciprocate along the length direction of the vibration slide bar, thereby effectively improving the practicability of the device.

[0018] Furthermore, the abutment member is configured as an abutment ball and is spherically hinged to the secondary shaft, and the abutment member is in rolling abutment with the transmission disc.

[0019] By adopting the above technical solution and setting the abutment member as abutment ball, rolling abutment is formed between the secondary shaft and the transmission plate and the lug through the abutment member, thereby effectively reducing the wear of the secondary shaft, the transmission plate and the lug, and improving the rotation smoothness of the secondary shaft.

[0020] Furthermore, a wind shield ring is fixedly connected to one end of the motor housing, and the wind shield ring is fixedly connected to one end of the heat dissipation fin away from the fan blades.

[0021] By adopting the above technical solution, by setting up the wind shield ring and the cooling fins, it is convenient to block and guide the air flowing along the length direction of the cooling fins, reduce the impact of the air driven by the fan blades on the output end of the motor shaft, and improve the practicality of the device.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. By setting up the coordination of the Hall sensor with the controller, MOSFET switch tube, and current and voltage detection elements, when starting the brushless motor, the Hall sensor can continuously feed back the precise position information of the rotor to the controller, and the controller can dynamically adjust the drive signals sent to the stator and windings according to this information. At the same time, the current and voltage detection elements are set to monitor the working status of the motor in real time through the voltage detection circuit and the current detection circuit, and when the voltage is abnormal or the current exceeds the safety threshold, the MOSFET switch tube is used to quickly cut off the power supply to prevent the motor from being damaged due to overload or voltage fluctuation. In this way, through such fine control and real-time monitoring, the brushless motor can not only achieve fast and reliable starting, but also maintain optimal performance during operation, effectively reducing the cost and complexity of the brushless motor starting protection, improving the reaction speed and reliability of the protection, and ensuring the stable starting and operation of the motor under various harsh conditions.

[0023] 2. By arranging the fan blades to be used in conjunction with the heat dissipation fins and the protective cover, when the main shaft of the driving motor drives the secondary shaft to rotate, the secondary shaft drives the fan blades to draw air to accelerate through the protective cover and blow to the surface of the motor housing, and realize contact heat exchange with the heat dissipation fins and the surface of the motor housing to reduce the surface temperature of the motor housing, thereby effectively improving the heat dissipation efficiency and operation stability of the brushless motor.

[0024] 3. By setting up the driving component for coordinated use with the vibration slide bar, the transmission disk, and the knocking block, when the main shaft of the driving motor drives the secondary shaft to rotate, the secondary shaft pushes the transmission disk to drive the knocking block to reciprocate along the length direction of the vibration slide bar, and forms a reciprocating collision with one end of the filter screen, so that the dust adhered to the surface of the filter screen falls off after being vibrated, thereby reducing the adhesion of dust on the surface of the filter screen, reducing the filtering effect of the filter screen, and improving the practicability of the device.

[0025] 4. By setting the cooperation of the resistance piece, the protrusion and the reset spring, when the driving countershaft drives the resistance piece to rotate, the resistance piece and the protrusion form a reciprocating resistance, and push the transmission plate along the length direction of the vibration slide bar to squeeze the reset spring to produce a contraction deformation, and then use the rebound characteristics of the reset spring to push the transmission plate to reset along the length direction of the vibration slide bar, so that the transmission plate is driven to drive the knocking block to move back and forth along the length direction of the vibration slide bar, thereby effectively improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0027] Figure 2 It is a schematic diagram of the internal structure of the motor housing in this application.

[0028] Figure 3 It is a side sectional view of the motor housing in this application.

[0029] Figure 4 It is an exploded view of the internal structure of the protective cover in this application.

[0030] Figure 5 It is a schematic diagram of the connection relationship between the vibration slide rod and the return spring in this application.

[0031] Description of reference numerals: 1. Motor housing; 2. Motor main shaft; 3. Rotor; 4. Stator; 5. Winding; 6. Hall sensor; 7. External expansion cabin; 8. Circuit board; 9. Controller; 10. MOSFET switch tube; 12. Current and voltage detection element; 13. Secondary shaft; 14. Fan blades; 15. Cooling fins; 16. Protective cover; 17. Filter; 18. Vibration slide bar; 19. Transmission plate; 20. Knocking block; 21. Resistance piece; 22. Bump; 23. Reset spring; 24. Wind shield ring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 —5 further describes this application in detail.

[0033] The embodiment of the present application discloses a brushless motor with a startup protection function.

[0034] Reference Figure 1 - Figure 3A brushless motor with a starting protection function comprises a motor housing 1, one end of the motor housing 1 is rotatably connected to a motor main shaft 2, one end of the motor main shaft 2 passes through the interior of the motor housing 1 and is fixedly connected to a rotor 3, a plurality of stators 4 are evenly and fixedly connected to the inner side of the motor housing 1, a winding 5 is wound around one end of the stator 4, a Hall sensor 6 is fixedly connected to the inner side of the stator 4, an outer expansion bin 7 is opened at one end of the motor housing 1, a circuit board 8 is fixedly connected to the interior of the outer expansion bin 7, a controller 9 is fixedly connected to one end of the circuit board 8, a MOSFET switch tube 10 is fixedly connected to one end of the circuit board 8, a current and voltage detection element 12 is fixedly connected to one end of the winding 5, and a heat dissipation component is installed at one end of the motor housing 1.

[0035] When in use, first, when starting the motor, the controller 9 is set to communicate with the Hall sensor 6 installed inside the motor to accurately obtain the real-time position information of the rotor 3, so as to determine the initial phase of the motor, and then according to the position information provided by the Hall sensor 6, the controller 9 calculates and sends the corresponding drive signal to the stator 4 and the winding 5, and guides the rotor 3 to drive the motor main shaft 2 to start rotating, thereby starting the motor; During this process, the current and voltage detection element 12 monitors the working state of the motor in real time through the voltage detection circuit and the current detection circuit. Once the voltage is abnormal or the current exceeds the safety threshold, the MOSFET switch tube 10 will take immediate action to quickly cut off the power supply to prevent the motor from being damaged due to overload or voltage fluctuation. If the motor startup process does not encounter any abnormality, the MOSFET switch tube 10 will restore normal power supply after confirming safety, so that the motor smoothly transitions to the normal operation mode. During the entire cycle of the motor operation, the Hall sensor 6 continuously feeds back the precise position information of the rotor 3 to the controller 9. Then the controller 9 uses this information to dynamically adjust the drive signal sent to the stator 4 and the winding 5 to ensure that the motor can maintain stable and efficient operation throughout the operation process; At the same time, by setting up a heat dissipation component to dissipate heat and cool the surface of the brushless motor during operation, the operating stability of the brushless motor is further improved. Through this precise control and real-time monitoring, the brushless motor can not only achieve fast and reliable startup, but also maintain optimal performance during operation, effectively reducing the cost and complexity of brushless motor startup protection, improving the response speed and reliability of protection, and ensuring stable startup and operation of the motor under various harsh conditions.

[0036] Reference Figure 2 - Figure 4The heat dissipation assembly includes a secondary shaft 13 fixedly connected to one end of the motor main shaft 2, one end of the secondary shaft 13 extends to the outside of the motor housing 1 and is fixedly connected to a fan blade 14, a plurality of heat dissipation fins 15 are evenly fixedly connected to the surface of the motor housing 1, a protective cover 16 adapted to the winding 5 is fixedly connected to one end of the motor housing 1, and the fan blade 14 is installed inside the protective cover 16; Wherein, the protective cover 16 is set as a bucket-shaped draft cover; Furthermore, one end of the protective cover 16 is fixedly connected with a filter screen 17 .

[0037] When in use, when the brushless motor is started to drive the motor main shaft 2 to rotate, the motor main shaft 2 drives the secondary shaft 13 to rotate, so that the fan blades 14 are used to draw the external air to accelerate through the protective cover 16, and guide it along the bucket-shaped inner wall structure of the protective cover 16 to the surface of the motor housing 1, and then the air that accelerates through the surface of the motor housing 1 is used to exchange heat and cool the motor housing 1, so as to reduce the surface temperature of the motor housing 1, thereby improving the operation stability of the brushless motor; At the same time, a plurality of heat dissipation fins 15 are evenly fixedly connected to the surface of the motor housing 1, so that when the air passes through the surface of the motor housing 1 at an accelerated speed, it passes between the plurality of heat dissipation fins 15 along the surface of the motor housing 1, and the contact area between the motor housing 1 and the air is increased through the heat dissipation fins 15, thereby improving the heat dissipation and cooling efficiency of the surface of the motor housing 1; At the same time, when the fan blades 14 are driven to draw air through the protective cover 16 and guide it to the surface of the motor housing 1, the air passing through the inside of the protective cover 16 is filtered and intercepted by the filter 17, so that foreign matter such as dust in the air is intercepted on the surface of the filter 17, and the air passes through the filter 17 and guides it to the surface of the motor housing 1, thereby effectively reducing the dust in the air from adhering to the surface of the motor housing 1 and reducing the heat dissipation efficiency of the surface of the motor housing 1.

[0038] Reference Figure 3 - Figure 5 The middle section of the filter 17 is slidably connected with a vibration slide bar 18, one end of the vibration slide bar 18 passes through the filter 17 and is fixedly connected with a transmission disc 19, one end of the transmission disc 19 is symmetrically fixedly connected with a knocking block 20, and one end of the secondary shaft 13 is installed with a transmission component for driving the knocking block 20 to hit the filter 17 along the length direction of the vibration slide bar 18; The transmission assembly includes a resistance member 21 symmetrically arranged at one end of the secondary shaft 13, a protrusion 22 adapted to the resistance member 21 is symmetrically fixedly connected to one end of the transmission disc 19, and a return spring 23 is sleeved at one end of the vibration slide bar 18, and the return spring 23 is installed between the transmission disc 19 and the filter screen 17; Furthermore, the abutment member 21 is configured as an abutment ball and is spherically hinged with the secondary shaft 13 , and the abutment member 21 is in rolling abutment with the transmission plate 19 .

[0039] When in use, when the brushless motor is started to drive the motor main shaft 2 to drive the secondary shaft 13 to rotate, the secondary shaft 13 drives the two abutment members 21 to rotate, so that the abutment members 21 roll and abut along the surface of the transmission disc 19, and when the abutment members 21 abut against the protrusions 22, the abutment members 21 push the protrusions 22 to drive the transmission disc 19 to move along the length direction of the vibration slide bar 18, and squeeze the reset spring 23 to produce a contraction deformation, and at the same time, the transmission disc 19 drives the protrusions 22 to collide with the filter screen 17 along the length direction of the vibration slide bar 18, so that the filter screen 17 vibrates, so that the dust adhering to the surface of the filter screen 17 falls off; Then, when the transmission disc 19 rotates to fall off and collide with the protrusion 22, the reset spring 23 is relieved of the force and rebounds along the length direction of the vibration slide bar 18 to push out the transmission disc 19, and the transmission disc 19 drives the knocking block 20 to fall off and collide with the filter screen 17. In this reciprocating manner, the transmission disc 19 drives the knocking block 20 to continuously collide with the filter screen 17 along the length direction of the vibration slide bar 18, thereby reducing the dust adhesion on the surface of the filter screen 17, reducing the filtering effect of the filter screen 17, and improving the practicability of the device.

[0040] Reference Figure 1 and Figure 2 , Figure 4 One end of the motor housing 1 is fixedly connected to a wind shield ring 24 , and the wind shield ring 24 is fixedly connected to one end of the heat dissipation fin 15 away from the fan blade 14 .

[0041] When in use, when the fan blades 14 are driven to draw air to accelerate through multiple cooling fins 15, the air collides with the wind shield ring 24 along the length direction of the cooling fins 15 and then expands toward the periphery of the motor housing 1, thereby reducing the impact of the air drawn by the fan blades 14 on the output end of the motor main shaft 2 and improving the practicability of the device.

[0042] The implementation principle of a brushless motor with a startup protection function in this embodiment is as follows: first, a current and voltage detection element 12 is set to monitor the working state of the motor in real time through a voltage detection circuit and a current detection circuit. Once a voltage abnormality or a current exceeding a safety threshold is detected, the MOSFET switch tube 10 is used to quickly cut off the power supply to prevent the motor from being damaged due to overload or voltage fluctuations. If the motor startup process does not encounter any abnormality, the MOSFET switch tube 10 will restore normal power supply after confirming safety, so that the motor smoothly transitions to the normal operation mode. During the entire cycle of the motor operation, the Hall sensor 6 continuously feeds back the precise position information of the rotor 3 to the controller 9. Then the controller 9 uses this information to dynamically adjust the drive signals sent to the stator 4 and the winding 5 to ensure that the motor can maintain a stable and efficient operation throughout the entire operation process; When the motor is started to drive the motor main shaft 2 to rotate, the motor main shaft 2 drives the secondary shaft 13 to rotate, so that the fan blades 14 are used to draw the external air to accelerate through the filter 17 and the protective cover 16, and the air drawn by the fan blades 14 is expanded along the guiding direction of the inner wall of the protective cover 16 when passing through the inside of the protective cover 16, thereby increasing the diffusion range of the air drawn by the fan blades 14, so that the air can be smoothly guided between the multiple heat sink fins 15; Then, the air passing through the plurality of heat dissipation fins 15 on the surface of the motor housing 1 is accelerated to exchange heat with the motor housing 1 to reduce the surface temperature of the motor housing 1, and the air is made to collide with the wind shield ring 24 along the length direction of the heat dissipation fins 15 and then expand to the periphery of the motor housing 1, thereby reducing the influence of the air pumped by the fan blades 14 on the output end of the motor main shaft 2, and at the same time, the filter 17 is used to filter and intercept dust in the air, thereby reducing the dust from blowing to the surface of the motor housing 1 and reducing the heat dissipation efficiency of the motor housing 1; At the same time, the secondary shaft 13 drives the two abutting members 21 to rotate, so that the abutting members 21 roll and abut along the surface of the transmission disc 19, and when the abutting members 21 abut against the protrusions 22, the abutting members 21 push the protrusions 22 to drive the transmission disc 19 to move along the length direction of the vibration slide bar 18, and squeeze the return spring 23 to produce a contraction deformation, and at the same time, the transmission disc 19 drives the protrusions 22 to collide with the filter screen 17 along the length direction of the vibration slide bar 18, so that the filter screen 17 vibrates, so that the dust adhered to the surface of the filter screen 17 falls off; Then, when the transmission disc 19 rotates to fall off and collide with the protrusion 22, the reset spring 23 is relieved of the force and rebounds along the length direction of the vibration slide bar 18 to push out the transmission disc 19, and the transmission disc 19 drives the knocking block 20 to fall off and collide with the filter screen 17. In this reciprocating manner, the transmission disc 19 drives the knocking block 20 along the length direction of the vibration slide bar 18 to continuously collide with the filter screen 17, thereby reducing the dust adhesion on the surface of the filter screen 17.

Claims

1. A brushless motor with a startup protection function, comprising a motor housing (1), characterized in that: One end of the motor housing (1) is rotatably connected to a motor main shaft (2), one end of the motor main shaft (2) passes through the interior of the motor housing (1) and is fixedly connected to a rotor (3), a plurality of stators (4) are evenly and fixedly connected to the inside of the motor housing (1), a winding (5) is wound around one end of the stator (4), a Hall sensor (6) is fixedly connected to the inside of the stator (4), an external expansion chamber (7) is opened at one end of the motor housing (1), a circuit board (8) is fixedly connected to the inside of the external expansion chamber (7), one end of the circuit board (8) is fixedly connected to a controller (9), and one end of the circuit board (8) is fixedly connected to a MOSFET switch tube (10), one end of the winding (5) is fixedly connected to a current and voltage detection element (12), and a heat dissipation component is installed at one end of the motor housing (1).

2. The brushless motor with startup protection function according to claim 1, characterized in that: The heat dissipation assembly comprises a secondary shaft (13) fixedly connected to one end of a motor main shaft (2); one end of the secondary shaft (13) extends to the outside of the motor housing (1) and is fixedly connected to a fan blade (14); a plurality of heat dissipation fins (15) are evenly fixedly connected to the surface of the motor housing (1); one end of the motor housing (1) is fixedly connected to a protective cover (16) adapted to the winding (5); and the fan blade (14) is mounted inside the protective cover (16).

3. The brushless motor with startup protection function according to claim 1, characterized in that: The protective cover (16) is configured as a bucket-shaped draft cover.

4. The brushless motor with startup protection function according to claim 1, characterized in that: One end of the protective cover (16) is fixedly connected to a filter screen (17).

5. The brushless motor with startup protection function according to claim 1, characterized in that: A vibration slide bar (18) is slidably connected to the middle section of the filter screen (17); one end of the vibration slide bar (18) passes through the filter screen (17) and is fixedly connected to a transmission disc (19); one end of the transmission disc (19) is symmetrically fixedly connected to a knocking block (20); and one end of the secondary shaft (13) is provided with a transmission component for driving the knocking block (20) to strike the filter screen (17) along the length direction of the vibration slide bar (18).

6. The brushless motor with startup protection function according to claim 1, characterized in that: The transmission assembly comprises a resistance member (21) symmetrically arranged at one end of the secondary shaft (13); one end of the transmission disc (19) is symmetrically fixedly connected with a protrusion (22) adapted to the resistance member (21); one end of the vibration slide rod (18) is sleeved with a return spring (23); the return spring (23) is installed between the transmission disc (19) and the filter screen (17).

7. The brushless motor with startup protection function according to claim 1, characterized in that: The abutment member (21) is configured as an abutment ball and is spherically hinged to the secondary shaft (13); the abutment member (21) is in rolling abutment with the transmission disc (19).

8. The brushless motor with startup protection function according to claim 1, characterized in that: One end of the motor housing (1) is fixedly connected to a wind shield ring (24), and the wind shield ring (24) is fixedly connected to one end of the heat dissipation fin (15) away from the fan blades (14).

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