Brushless DC torque motor

Abstract

The invention relates to the technical field of motors, in particular to a brushless direct-current torque motor. The brushless direct-current torque motor comprises a motor frame, a rotor is fixedly arranged in the middle of the inner wall of the motor frame, a fixing plate is fixedly arranged on the upper side of the inner wall of the motor frame, an output shaft is rotationally arranged on the side face of the fixing plate, and a driven gear, a connecting ring and a limiting block are driven by the output shaft through a driving gear to rotate. A limiting ring and a round rod are limited through a moving groove, so that a limiting block drives the round rod and the limiting ring to rotate through a limiting groove when rotating, meanwhile, the limiting rod limits a guide groove, the round rod drives a protection plate and an air suction blade to rotate, external airflow is sucked into a motor frame, and a filter disc filters pollutants such as dust in air; and secondly, hot air in the motor frame is discharged through the ventilation grooves, so that the possibility that pollutants in the air are deposited in the motor frame is reduced, and the service life of the motor is ensured.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a brushless DC torque motor. Background Technology

[0002] Brushless DC torque motors, due to their high efficiency, high torque density, long lifespan, and low maintenance requirements, are gradually replacing traditional brushed motors and becoming the core drive component of modern electromechanical systems. Traditional brushed motors rely on mechanical commutation, which suffers from problems such as brush wear and spark interference. Brushless motors, on the other hand, employ electronic commutation technology, significantly improving reliability and control precision. In recent years, with advancements in permanent magnet materials, power electronics, and control algorithms, brushless DC torque motors have undergone continuous optimization in dynamic response, energy efficiency, and electromagnetic compatibility, further expanding their applications in high-end fields such as precision servo systems, aerospace, and intelligent equipment.

[0003] In current brushless motor heat dissipation designs, traditional heat dissipation methods generally employ an airflow guidance scheme combining vented housings and rotating fan blades. While this heat dissipation mechanism can generate forced convection through the fan blades driven by the output shaft during motor operation, introducing external cool air into the motor for heat exchange, its open structure inevitably leads to the intrusion of environmental pollutants. In industrial applications, solid pollutants such as dust particles and metal shavings in the air can easily enter the motor cavity with the heat dissipation airflow. These impurities will gradually form a deposit layer in the coil windings, permanent magnet gaps, and bearing areas, which not only affects the uniformity of the air gap between the stator and rotor but may also cause partial discharge or short circuit risks in the motor, thereby reducing the service life of the motor.

[0004] In view of this, we propose a brushless DC torque motor. Summary of the Invention

[0005] The purpose of this invention is to provide a brushless DC torque motor to address the airflow guidance scheme proposed in the background art, which uses an open outer shell combined with rotating fan blades. Although this heat dissipation mechanism can generate forced convection through the fan blades driven by the output shaft during motor operation, introducing external cold air into the motor for heat exchange, its open structure inevitably brings the problem of environmental pollutant intrusion. In industrial applications, solid pollutants such as dust particles and metal shavings in the air can easily enter the motor cavity with the heat dissipation airflow. These impurities will gradually form a deposit layer in the coil windings, permanent magnet gaps, and bearings, which not only affects the uniformity of the air gap between the stator and rotor, but may also cause partial discharge or short circuit risks in the motor, thereby reducing the service life of the motor. To achieve the above objectives, the present invention provides the following technical solution: a brushless DC torque motor, comprising a motor frame, a rotor fixedly disposed in the middle of the inner wall of the motor frame, a fixing plate fixedly disposed on the upper side of the inner wall of the motor frame, an output shaft rotatably disposed on the side of the fixing plate, a drive gear fixedly sleeved on the side of the output shaft, four movable slots opened on the top of the fixing plate, movable components for heat dissipation of the motor being slidably disposed inside the movable slots, a protective cover fixedly disposed on the top of the motor frame, a protective frame slidably disposed on the bottom of the motor frame, two elongated slots opened on the bottom of the protective frame, and fixing components slidably disposed on the sides of the inner walls of the two elongated slots.

[0006] Preferably, the moving component includes four limiting rings, which are slidably disposed inside four moving slots. A round rod is fixedly disposed inside each limiting ring, and a limiting groove is formed on the side of the round rod. A connecting ring is movably sleeved on the side of the round rod, and a limiting block is fixedly disposed inside the connecting ring. The side of the limiting block slides into the inside of the limiting groove. A driven gear is fixedly sleeved on the outside of the limiting ring, and the driven gear meshes with the driving gear. A guide groove is formed on the side of the limiting ring. The precise fit between the limiting ring and the moving slots ensures the accuracy of the motion trajectory. The sliding fit between the limiting block and the limiting groove transmits rotational torque and allows axial displacement. The meshing of the driven gear and the driving gear provides smooth power transmission.

[0007] Preferably, four limiting rods are fixedly installed on the top of the fixed plate, and the four limiting rods correspond one-to-one with the four guide grooves. The sides of the limiting rods slide in conjunction with the interior of the guide grooves. The top of the protective cover has four ventilation grooves, and a protective plate is slidably installed inside the ventilation grooves. The bottom of the protective plate is fixedly connected to the side of the round rod. The cooperation between the limiting rods and the guide grooves realizes precise guidance of the movement trajectory, ensuring that the components maintain synchronous coordination during the compound movement. The rigid connection between the protective plate and the round rod makes the ventilation control more precise and reliable.

[0008] Preferably, the cross-sectional shape of the guide groove is N-shaped, the shape of the limiting rod is L-shaped, and the end of the limiting rod that contacts the guide groove is semi-circular. The special geometric design of the N-shaped guide groove and the L-shaped limiting rod creates a unique motion trajectory. The semi-circular contact end effectively reduces frictional resistance, ensuring the smoothness of the motion process and realizing a complex composite motion path.

[0009] Preferably, the fixing component includes two stop bars, which are slidably disposed inside two elongated slots. Four elongated rods are fixedly disposed at the bottom of the protective cover. The bottom of the elongated rods penetrates the lower side of the motor frame and slides in cooperation with the interior of the protective frame. Stop blocks are fixedly connected to both the front and rear sides of the stop bars. Slots are opened on the sides of the stop blocks. The stop blocks and the elongated rods are concentric. C-shaped grooves are opened on both the front and rear sides of the inner wall of the protective frame. C-shaped strips are slidably disposed inside the C-shaped grooves. The sliding cooperation between the stop bars and the elongated slots achieves rapid positioning. The concentric design of the stop blocks and the elongated rods ensures assembly accuracy. The cooperation between the C-shaped grooves and the C-shaped strips provides an elastic locking function. The overall structure ensures both assembly firmness and facilitates quick disassembly and maintenance.

[0010] Preferably, there are two C-shaped bars. Each of the two horizontal bars of the two C-shaped bars has a tension spring fixedly installed on opposite sides. One end of the tension spring is fixedly connected to the side of the inner wall of the horizontal groove of the C-shaped groove. A connecting block is fixedly installed on the side of the two vertical bars of the C-shaped bars. An insert block is fixedly installed on the side of the connecting block. The side of the insert block slides into the inside of the slot. The length of the insert block is equal to the length of the inner wall of the horizontal groove of the C-shaped groove. The C-shaped bar mechanism driven by the tension spring realizes automatic reset. The connecting block and the insert block ensure the uniform distribution of locking force. The precise cooperation between the insert block and the slot provides reliable mechanical interlocking.

[0011] Preferably, the bottom of the protective frame has several ventilation mesh holes, a filter is fixedly installed in the middle of the inner wall of the protective frame, and an air intake blade is fixedly installed on the lower side of the output shaft. The combination design of the ventilation mesh holes and the filter achieves the dual effect of efficient ventilation and dust prevention. The air intake blade enables active airflow circulation, protects the internal components, optimizes thermal management performance, and significantly improves the operational stability of the equipment.

[0012] Preferably, the side of the fixing plate has four through slots, and the four through slots are evenly spaced in a ring. The ring-shaped through slot design achieves uniform stress distribution, which reduces the structural weight while ensuring mechanical strength. This optimized design also improves the airflow channel and helps to improve heat dissipation efficiency.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the output shaft drives the driven gear, connecting ring, and limiting block to rotate via the driving gear. The limiting ring and the round rod are limited by the moving groove, so that when the limiting block rotates, it drives the round rod and the limiting ring to rotate through the limiting groove. At the same time, the limiting rod limits the guide groove, so that the round rod drives the protective plate. Meanwhile, the suction blades rotate to draw external airflow into the motor frame, and the filter filter filters dust and other pollutants in the air. Then, the hot airflow inside the motor frame is discharged through the ventilation groove, thereby reducing the possibility of pollutants in the air accumulating inside the motor frame and ensuring the service life of the motor.

[0014] In this invention, the protective frame is aligned with the motor frame, and the stop block is moved into the long slot by the stop bar. Then, the protective frame is fixed with hexagonal bolts and abuts against the C-shaped strip, so that the C-shaped strip drives the connecting block and the insert block to close in the middle until the insert block moves into the slot. The stop bar and the stop block are then limited and fixed. At this time, the protective frame is fixed on the lower side of the motor frame, which can ensure that the force of fixing the protective frame to the bottom of the motor frame is the same and reduce the possibility of the protective frame tilting when fixed to the bottom of the inner wall of the motor.

[0015] In this invention, after removing the hexagonal bolts on the front and rear sides of the motor frame, the two C-shaped strips are driven by the tension of the spring to reset the connecting block and the insert block on their side, so that the insert block is moved out of the slot, releasing the fixation of the stop block and the stop bar. By moving the two stop bars and the stop block out of the long slot, the protective frame and the motor frame can be released from fixation, and the ventilation mesh inside the protective frame can be cleaned quickly and the filter can be replaced. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the motor frame of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the fixing plate of the present invention; Figure 4 This is a partial three-dimensional cross-sectional view of the fixing plate of the present invention; Figure 5 This is a partial three-dimensional structural diagram of the moving component of the present invention; Figure 6 This is a partial three-dimensional structural diagram of the connecting ring of the present invention; Figure 7 This is a three-dimensional structural development view of the protective cover of the present invention; Figure 8 This is a partial three-dimensional structural unfolded view of the present invention; Figure 9 This is a partial three-dimensional cross-sectional view of the protective frame of the present invention; Figure 10This is a partial three-dimensional structural diagram of the C-shaped strip of the present invention.

[0017] In the diagram: 1. Motor frame; 2. Rotor; 3. Fixing plate; 301. Limiting rod; 302. Through slot; 4. Output shaft; 401. Intake blade; 5. Drive gear; 6. Moving slot; 7. Moving assembly; 701. Limiting ring; 702. Round rod; 703. Limiting slot; 704. Connecting ring; 705. Limiting block; 706. Driven gear; 707. Guide slot; 8. Protective cover; 801. Ventilation slot; 802. Protective plate; 803. Long rod; 9. Protective frame; 901. C-shaped slot; 902. C-shaped strip; 903. Tension spring; 904. Insert block; 905. Connecting block; 906. Ventilation mesh; 907. Filter sheet; 10. Long slot; 11. Fixing assembly; 1101. Stop bar; 1102. Slot; 1103. Stop block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 10 The present invention provides a technical solution: a brushless DC torque motor, including a motor frame 1, a rotor 2 fixedly disposed in the middle of the inner wall of the motor frame 1, a fixing plate 3 fixedly disposed on the upper side of the inner wall of the motor frame 1, an output shaft 4 rotatably disposed on the side of the fixing plate 3, a drive gear 5 fixedly sleeved on the side of the output shaft 4, four movable slots 6 opened on the top of the fixing plate 3, movable components 7 for heat dissipation of the motor slidably disposed inside the movable slots 6, a protective cover 8 fixedly disposed on the top of the motor frame 1, a protective frame 9 slidably disposed on the bottom of the motor frame 1, two long slots 10 opened on the bottom of the protective frame 9, and fixing components 11 slidably disposed on the side of the inner wall of each of the two long slots 10.

[0020] Example 1: Please see Figures 5 to 6 This embodiment provides a technical solution: The moving component 7 includes four limiting rings 701, which are slidably disposed inside the four moving slots 6. A round rod 702 is fixedly disposed inside the limiting ring 701. A limiting groove 703 is opened on the side of the round rod 702. A connecting ring 704 is movably sleeved on the side of the round rod 702. A limiting block 705 is fixedly disposed inside the connecting ring 704. The side of the limiting block 705 slides in cooperation with the inside of the limiting groove 703. A driven gear 706 is fixedly sleeved on the outside of the limiting ring 701. The driven gear 706 meshes with the driving gear 5. A guide groove 707 is opened on the side of the limiting ring 701. In this embodiment, a stable axial movement channel is constructed by the engagement of the limiting ring 701 with the round rod 702 through its inner wall. This structure can effectively constrain the movement trajectory of the round rod 702, enabling it to achieve precise vertical linear displacement within the limited range of the moving groove 6. At the same time, the unique meshing design of the limiting block 705 and the limiting groove 703 forms a key power transmission hub. When the driven gear 706 rotates under the drive of the driving gear 5, the limiting block 705 transmits the rotational torque to the round rod without loss through the limiting groove 703. 702 enables the round rod 702 to complete reciprocating motion in the vertical direction under the guidance of the limiting ring 701, and to rotate around the axis through the transmission of the limiting block 705. The opening of the guide groove 707 further optimizes the stability of the motion process and ensures that the components remain coordinated and synchronized during compound motion. The entire transmission system achieves a perfect unity of power transmission and motion control through the synergistic effect of the limiting ring 701, the limiting block 705 and the driven gear 706. It is particularly suitable for precision mechanical systems that need to complete linear propulsion and rotational movements simultaneously.

[0021] Example 2: Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figures 6 to 7 This embodiment provides a technical solution: Four limiting rods 301 are fixedly installed on the top of the fixed plate 3. The four limiting rods 301 correspond one-to-one with the four guide grooves 707. The side of the limiting rod 301 slides in cooperation with the inside of the guide groove 707. The top of the protective cover 8 is provided with four ventilation grooves 801. A protective plate 802 is slidably installed inside the ventilation grooves 801. The bottom of the protective plate 802 is fixedly connected to the side of the round rod 702. The cross-sectional shape of the guide groove 707 is N-shaped, the shape of the limiting rod 301 is L-shaped, and the end of the limiting rod 301 that contacts the guide groove 707 is semi-circular; In this embodiment, when the driving gear 5 starts to rotate under power, its tooth surface precisely meshes with the tooth groove of the driven gear 706, thereby transmitting the rotational motion to the driven gear 706. As the driven gear 706 rotates, the limiting ring 701 fixed on it also rotates. At this time, the limiting rod 301 and the guide groove 707 opened on the side of the limiting ring 701 form a sliding fit. This special design causes the limiting rod 301 to generate relative displacement in the guide groove 707, thereby forcing the limiting ring 701 to generate axial displacement while rotating. Since the round rod 702 is fixedly connected to the limiting ring 701, this composite motion is completely transmitted to the round rod 702, causing it to rotate around itself. The shaft rotates and moves up and down along the axial direction. The protective plate 802 at the top of the round rod 702 is rigidly connected to the round rod 702 through a connector, so it will synchronously follow the movement trajectory of the round rod 702. When the round rod 702 moves upward and rotates, the protective plate 802 rises and rotates accordingly, so that the protective plate 802 and the venting groove 801 on the housing form a specific angle alignment relationship, thereby completely exposing the venting groove 801 that was originally covered by the protective plate 802, realizing the ventilation function of the system. During the entire movement, the cooperation between the limiting rod 301 and the guide groove 707 ensures the accuracy of the movement trajectory, while the meshing of the driven gear 706 and the driving gear 5 provides stable power transmission.

[0022] Example 3: Please see Figures 1 to 10 This embodiment provides a technical solution: The fixing component 11 includes two baffles 1101, which are slidably disposed inside the two long slots 10 respectively. Four long rods 803 are fixedly disposed at the bottom of the protective cover 8. The bottom of the long rods 803 penetrates the lower side of the motor frame 1 and slides in cooperation with the interior of the protective frame 9. Baffles 1103 are fixedly connected to both the front and rear sides of the baffles 1101. Slots 1102 are opened on the side of the baffles 1103. The baffles 1103 and the long rods 803 are at the same center. C-shaped grooves 901 are opened on both the front and rear sides of the inner wall of the protective frame 9. C-shaped strips 902 are slidably disposed inside the C-shaped grooves 901. It should be noted that hexagonal bolts are threaded on both the front and rear sides of the protective frame 9, and the ends of the hexagonal bolts abut against the side of the horizontal strip of the C-shaped strip 902. There are two C-shaped bars 902. Each of the two horizontal bars of the two C-shaped bars 902 has a tension spring 903 fixedly installed on the opposite side. One end of the tension spring 903 is fixedly connected to the side of the inner wall of the horizontal groove of the C-shaped groove 901. A connecting block 905 is fixedly installed on the side of the two vertical bars of the C-shaped bars 902. An insert block 904 is fixedly installed on the side of the connecting block 905. The side of the insert block 904 slides with the inside of the slot 1102. The length of the insert block 904 is equal to the length of the inner wall of the horizontal groove of the C-shaped groove 901. The bottom of the protective frame 9 has several ventilation mesh holes 906, a filter 907 is fixedly installed in the middle of the inner wall of the protective frame 9, and an air intake blade 401 is fixedly installed on the side of the lower output shaft 4. The side of the fixing plate 3 has four through slots 302, and the four through slots 302 are evenly spaced in a ring shape. In this embodiment, when it is necessary to disassemble the motor frame 1, protective frame 9, and protective cover 8, firstly, a special tool is used to completely loosen and remove the fixing hex bolts. At this time, the two C-shaped bars 902, which were originally pressed by the bolts, will move outward along the preset track under the elastic restoring force of the tension spring 903, achieving automatic reset. The movement of the C-shaped bars 902 is precisely transmitted to the insertion block 904 through the connecting block 905, forcing the insertion block 904 to smoothly exit from the locked position of the slot 1102. As the insertion block 904 moves, the original... The mechanical interlocking structure formed by the insert block 904, the stop bar 1101, and the stop block 1103 is released, and the constraint force between the stop bar 1101 and the stop block 1103 disappears. This allows the fixed connection between the motor frame 1, the protective frame 9, and the protective cover 8 to be released quickly, and the components can be easily separated. The entire disassembly process utilizes the elastic potential energy of the tension spring 903 as a power source. Through the mechanical transmission of the C-shaped bar 902, the connecting block 905, and the insert block 904, the tool-free quick disassembly function is realized, which greatly improves the maintenance efficiency of the equipment.

[0023] The method of use and advantages of this invention: The working process of this brushless DC torque motor during operation and use is as follows: like Figures 1 to 10 As shown, the output shaft 4 drives the drive gear 5 to rotate, which in turn drives four driven gears 706 to rotate. The driven gears 706 then drive the internal connecting ring 704 and the limiting block 705 to rotate. Simultaneously, the moving groove 6 limits the limiting ring 701 and the round rod 702. When the limiting block 705 rotates, it drives the round rod 702 and the limiting ring 701 to rotate through the limiting groove 703. At the same time, the limiting rod 301 limits the guide groove 707, causing the round rod 702 to reciprocate up and down as it rotates, driving the guide groove 707 on its side. The round rod 702 also drives the protective plate 80... 2. The protective plate 802 moves up and down and rotates continuously on the top of the protective cover 8, so that the ventilation groove 801 can be opened when the motor is running. At the same time, the output shaft 4 drives the suction blade 401 to rotate. When the ventilation groove 801 is open, the suction blade 401 draws the external airflow into the motor frame 1 through the ventilation mesh 906, and the filter 907 filters the dust and other pollutants in the air. Then, the hot airflow inside the motor frame 1 is discharged through the ventilation groove 801, thereby reducing the possibility of pollutants in the air accumulating inside the motor frame 1 and ensuring the service life of the motor. First, align the protective frame 9 with the lower side of the motor frame 1 and move the long rod 803 into the interior of the protective frame 9. Align the position of the protective frame 9 with the motor frame 1. At the same time, move the stop block 1103 into the interior of the long slot 10 via the stop bar 1101. Next, move the hexagonal socket head cap screw into the interior of the protective frame 9 and abut the side of the C-shaped bar 902 through the end of the hexagonal socket head cap screw. This causes the C-shaped bar 902 to move the connecting block 905 and the insert block 904 on its side to close in the middle until the insert block 904 moves into the interior of the slot 1102. This limits and fixes the stop bar 1101 and the stop block 1103. At this time, the protective frame 9 is fixed on the lower side of the motor frame 1, which ensures that the force of fixing the protective frame 9 to the bottom of the motor frame 1 is the same and reduces the possibility of the protective frame 9 tilting when fixed to the bottom of the inner wall of the motor. After removing the hexagonal bolts on the front and rear sides of the motor frame 1, the two C-shaped bars 902 are driven by the tension of the tension spring 903 to reset the connecting block 905 and the insert block 904 on their sides, so that the insert block 904 moves out of the slot 1102, thereby releasing the fixation between the stop block 1103 and the stop bar 1101. Then, the two stop bars 1101 and the stop block 1103 are moved out of the long slot 10, so that the protective frame 9 can be released from the motor frame 1. The ventilation mesh 906 inside the protective frame 9 can be cleaned quickly and the filter 907 can be replaced.

[0024] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless DC torque motor, comprising a motor frame (1), wherein a rotor (2) is fixedly disposed in the middle of the inner wall of the motor frame (1), and a fixing plate (3) is fixedly disposed on the upper side of the inner wall of the motor frame (1), characterized in that: The fixed plate (3) has an output shaft (4) rotatably mounted on its side. The output shaft (4) has a drive gear (5) fixedly sleeved on its side. The fixed plate (3) has four moving slots (6) on its top. The moving slots (6) have moving components (7) for heat dissipation of the motor slidably mounted inside them. The motor frame (1) has a protective cover (8) fixedly mounted on its top. The motor frame (1) has a protective frame (9) slidably mounted on its bottom. The protective frame (9) has two long slots (10) on its bottom. The inner walls of the two long slots (10) are slidably mounted with fixed components (11).

2. The brushless DC torque motor according to claim 1, characterized in that: The moving component (7) includes four limiting rings (701), which are slidably disposed inside the four moving slots (6). A round rod (702) is fixedly disposed inside the limiting ring (701). A limiting groove (703) is opened on the side of the round rod (702). A connecting ring (704) is movably sleeved on the side of the round rod (702). A limiting block (705) is fixedly disposed inside the connecting ring (704). The side of the limiting block (705) slides in cooperation with the inside of the limiting groove (703). A driven gear (706) is fixedly sleeved on the outside of the limiting ring (701). The driven gear (706) meshes with the driving gear (5). A guide groove (707) is opened on the side of the limiting ring (701).

3. A brushless DC torque motor according to claim 2, characterized in that: The top of the fixed plate (3) is fixedly provided with four limiting rods (301), and the four limiting rods (301) correspond one-to-one with the four guide grooves (707). The side of the limiting rod (301) slides in cooperation with the inside of the guide groove (707). The top of the protective cover (8) is provided with four ventilation grooves (801). The inside of the ventilation grooves (801) is slidably provided with a protective plate (802). The bottom of the protective plate (802) is fixedly connected to the side of the round rod (702).

4. A brushless DC torque motor according to claim 3, characterized in that: The cross-sectional shape of the guide groove (707) is N-shaped, the shape of the limiting rod (301) is L-shaped, and the end of the limiting rod (301) that contacts the guide groove (707) is semi-circular.

5. A brushless DC torque motor according to claim 1, characterized in that: The fixing component (11) includes two baffles (1101), which are slidably disposed inside the two long slots (10). The bottom of the protective cover (8) is fixedly provided with four long rods (803). The bottom of the long rods (803) passes through the lower side of the motor frame (1) and slides in cooperation with the inside of the protective frame (9). The front and rear sides of the baffles (1101) are fixedly connected with blocks (1103). The side of the blocks (1103) is provided with slots (1102). The blocks (1103) and the long rods (803) are at the same center. The front and rear sides of the inner wall of the protective frame (9) are provided with C-shaped grooves (901). C-shaped strips (902) are slidably disposed inside the C-shaped grooves (901).

6. A brushless DC torque motor according to claim 5, characterized in that: There are two C-shaped bars (902). Each of the two horizontal bars of the two C-shaped bars (902) is fixedly provided with a tension spring (903) on the opposite side. One end of the tension spring (903) is fixedly connected to the side of the inner wall of the horizontal groove of the C-shaped groove (901). A connecting block (905) is fixedly provided on the side of the two vertical bars of the C-shaped bars (902). An insert (904) is fixedly provided on the side of the connecting block (905). The side of the insert (904) slides in cooperation with the inside of the slot (1102). The length of the insert (904) is equal to the length of the inner wall of the horizontal groove of the C-shaped groove (901).

7. A brushless DC torque motor according to claim 1, characterized in that: The bottom of the protective frame (9) has several breathable mesh holes (906), a filter (907) is fixedly installed in the middle of the inner wall of the protective frame (9), and an air intake blade (401) is fixedly installed on the lower side of the side of the output shaft (4).

8. A brushless DC torque motor according to claim 1, characterized in that: The side of the fixing plate (3) is provided with four through slots (302), and the four through slots (302) are evenly spaced in a ring shape.

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