Motor self-cleaning structure for unmanned aerial vehicle

Abstract

The invention provides a motor self-cleaning structure for an unmanned aerial vehicle, and belongs to the technical field of aircrafts. The centrifugal contact piece capable of synchronously rotating is arranged on the rotor shell, the centrifugal contact piece is provided with the sliding trigger part and the deflecting contact part, and meanwhile, the fan blade with the matching part is rotationally mounted on the bearing bracket, so that the contact part can be driven to deflect through centrifugal movement of the trigger part under the condition that the rotor shell rotates at a high speed; one end of the contact part can be in contact with the matching part to ensure that the centrifugal contact piece can drive the fan blades to rotate, so that airflow is formed in the motor to perform self-cleaning on the interior of the motor, the risk that the motor is easily damaged due to disassembly and assembly is effectively avoided, and operation by professionals is not needed; and moreover, the problem that the service performance and the service life of the motor are influenced by accelerated wear caused by impurities and the like is avoided, the heat dissipation efficiency of the motor under high-load operation can be improved, and the service performance of the motor is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft, and in particular to a motor self-cleaning structure for an unmanned aerial vehicle. Background Art

[0002] With the development of the low-altitude economy, drones are being used in more and more scenarios and their audiences are gradually increasing. As the core component of drones, motors are the power structure that ensures the normal operation of drones. Therefore, the motor performance of drones is directly related to the use effect of drones.

[0003] At present, the existing drones on the market usually use an outer rotor three-phase brushless motor as a driving structure, which has the advantages of high load and long endurance, and meets the use requirements of stable flight and completing complex actions. The outer rotor three-phase brushless motor in the prior art is usually an outer rotor three-phase brushless motor and a manufacturing method thereof disclosed in patent application CN115622304A, which has a rotor housing rotatably connected to a rotor shaft and a positioning iron core provided with a middle hole, the middle hole is sleeved on the rotor shaft, the peripheral wall of the stator core is sleeved with a magnetic ring, the outer peripheral wall of the magnetic ring is in contact with the inner wall of the rotor housing, and a plurality of coils are wound on the winding core column of the stator core, an air gap is provided between the stator core and the magnetic ring and the rotor housing, a bearing bracket is connected to the rotor housing and a bearing through which the rotor shaft is passed is provided at its center, and a PCB circuit board is provided on the side of the bearing bracket away from the stator core, and after the coil is powered by the PCB circuit board, the rotor housing can be rotated to output power. Although the above-mentioned motor can already achieve power output and meet the flight requirements of the drone, its structure fundamentally only includes control structures such as a rotor stabilizer, a stator, and a PCB circuit board, which can only ensure that the motor can operate normally. However, due to its outer rotor structure, it has a structural defect of poor sealing. As a result, after long-term use, foreign dust and other impurities will enter the motor and adhere to structural parts such as the stator and rotor, accelerating wear and causing motor abnormalities. Therefore, it is necessary to manually disassemble the motor regularly for internal cleaning. Not only does repeated disassembly and assembly of the motor easily damage the structure, but it also requires professional personnel to perform the operation, which is difficult to operate. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a self-cleaning structure of a motor for an unmanned aerial vehicle, so that a centrifugal contact piece is arranged on the inner wall of the rotor housing. At the same time, a fan blade is also sleeved inside the rotor housing and located on the rotor shaft, and a mating part is provided on the side of the fan blade close to the centrifugal contact piece. When the centrifugal contact piece rotates at a high speed, it contacts the mating part to drive the fan blade to rotate, thereby forming an airflow inside the motor. Not only can the inside of the motor be cleaned to meet the use requirements of self-cleaning without the need for regular cleaning, thereby preventing structural damage, but also the heat dissipation can be accelerated under high-load operation to maintain the use performance of the motor.

[0005] The specific technical solutions are as follows: A self-cleaning structure of a motor for a drone, comprising a rotor housing, a rotor shaft, a coil stator, a magnetic ring, a PCB board and a bearing bracket, wherein the rotor housing has an inner cavity, one end of the rotor shaft is mounted on the rotor housing, the magnetic ring is sleeved outside the rotor shaft at intervals and abuts against the inner wall of the rotor housing, the bearing bracket is rotatably sleeved outside the rotor shaft and a plurality of bearings are arranged between the bearing bracket and the rotor shaft, the coil stator is fixedly sleeved outside the bearing bracket and is coaxially arranged with the magnetic ring, and an air gap is arranged between the coil stator and the magnetic ring, the PCB board is fixedly mounted on the bearing bracket and is electrically connected to the coil stator, and has such features, and further comprises a centrifugal contact and a fan blade; The fan blade is rotatably mounted on a side of the bearing bracket away from the PCB board, and a matching portion is provided on the side of the fan blade away from the bearing bracket; The centrifugal contact piece includes a trigger part and a contact part. The trigger part is arranged in the inner cavity and reciprocates along the radial direction of the rotor shell. The middle part of the contact part is hinged on the rotor shell. One end of the contact part is connected to the trigger part, and the other end of the contact part selectively contacts the matching part. In addition, the distance between the trigger part and the axis of the rotor shell is proportional to the rotation speed of the rotor shell.

[0006] The above-mentioned self-cleaning structure of a motor for an unmanned aerial vehicle, wherein a slide is coaxially arranged on the rotor housing and on a side close to the matching part, a plurality of slideways are opened on the slide along its radial direction, a trigger part is slidably arranged in each slideway, a hinged portion of the contact part is hinged to a side of the slide close to the outer edge of the slide, and one end of the contact part extends into the slideway and is located on a side of the trigger part away from the axis of the rotor housing.

[0007] In the above-mentioned self-cleaning structure of the motor for drone, a plurality of hinge blocks are arranged on the side of the slide close to the fan blades, and one slide corresponds to one hinge block. At the same time, the part where the contact part is hinged to the rotor housing is hinged to the hinge block.

[0008] In the above-mentioned self-cleaning structure of the motor for drone, a limit spring is also arranged in each slide and on the side of the trigger part away from the axis of the rotor housing, and the two ends of the limit spring respectively abut against the inner wall of the rotor housing or the slide and the trigger part.

[0009] The above-mentioned self-cleaning structure of a motor for an unmanned aerial vehicle is characterized in that a side of the trigger portion close to the fan blade is provided with an avoidance cavity, and one end of the contact portion connected to the trigger portion extends into the avoidance cavity. At the same time, an axial hole connected to the avoidance cavity is provided on the side wall of the trigger portion, and a pin shaft extending into the avoidance cavity is installed in the axial hole. A strip slide groove is provided on the end of the contact portion connected to the trigger portion, and one end of the pin shaft penetrates into the strip slide groove.

[0010] The above-mentioned self-cleaning structure of the motor for drone, wherein the mating part is an annular cylinder, the annular cylinder is sleeved outside the rotor shaft, and a plurality of protruding baffles are arranged on the outer wall of the annular cylinder, and the plurality of baffles are distributed in an annular array with the axis of the annular cylinder as the axis center.

[0011] In the above-mentioned self-cleaning structure of a motor for a drone, a contact head is provided at one end of the contact portion that selectively contacts the mating portion, and the contact head is selectively inserted between two adjacent baffle bars, and both the contact head and the baffle bars are made of rubber.

[0012] The above-mentioned self-cleaning structure of a motor for an unmanned aerial vehicle also includes a heat dissipation slide, which is slidably arranged on the end of the rotor housing where the centrifugal contact piece is arranged, and a plurality of first inlet and outlet air holes are opened on the rotor housing and located on the end where the centrifugal contact piece is arranged, and a plurality of second inlet and outlet air holes cooperating with the first inlet and outlet air holes are opened on the heat dissipation slide, the heat dissipation slide is connected to the trigger part, and when the trigger part is not moved, the first inlet and outlet air holes are misaligned with the second inlet and outlet air holes.

[0013] In the above-mentioned self-cleaning structure of a motor for an unmanned aerial vehicle, a sliding groove is provided on the slide frame along the arrangement direction of the slideway, the connecting portion of the heat dissipation slide is slidably arranged in the sliding groove, and the heat dissipation slide is connected to the side of the trigger portion away from the contact portion.

[0014] In the above-mentioned self-cleaning structure of a motor for a drone, a spring piece is provided between the contact portion and the contact head, and the spring piece is arranged along the tangential direction of the mating portion.

[0015] The above-mentioned self-cleaning structure of a motor for an unmanned aerial vehicle, wherein the rotor housing is arranged in a barrel shape, the PCB board is arranged at one end of the barrel mouth of the rotor housing, and a cover is arranged at the barrel mouth of the rotor housing, the cover covers the PCB board and is fixedly connected to the bearing bracket.

[0016] The positive effects of the above technical solution are: The above-mentioned self-cleaning structure of the motor for the drone is achieved by arranging a synchronously rotatable centrifugal contact piece on the rotor housing, and rotatably installing a fan blade with a mating part on the internal bearing bracket, so that when the rotor housing rotates at high speed, the centrifugal movement of the trigger part can push the contact part to deflect, so that one end of the contact part contacts the mating part, so that the rotor housing drives the fan blade to rotate, and an airflow is formed inside the motor through the rotation of the fan blade to self-clean the inside of the motor. This can be achieved without disassembling the motor, reducing the risk of damage to the motor during disassembly and assembly and avoiding the problem of requiring professional personnel to operate. At the same time, it also avoids the problem of accelerated wear affecting the performance and life of the motor, and can accelerate heat dissipation under high-load operation, further ensuring the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Structural diagram of an embodiment of a motor self - cleaning structure for an unmanned aerial vehicle according to the present invention; Figure 2 Cross - sectional view of an embodiment of a motor self - cleaning structure for an unmanned aerial vehicle according to the present invention; Figure 3 Structural diagram of a carriage in a preferred embodiment of the present invention; Figure 4 Structural diagram of a trigger part in a preferred embodiment of the present invention; Figure 5 Structural diagram of a contact part in a preferred embodiment of the present invention; Figure 6 is Figure 2 the enlarged view of part A in

[0018] In the drawings: 1, rotor housing; 11, first air inlet and outlet hole; 2, rotor shaft; 3, coil stator; 4, magnetic ring; 5, bearing bracket; 6, centrifugal contact member; 61, trigger part; 62, contact part; 63, carriage; 64, limiting spring; 65, heat - dissipating fin; 66, pin shaft; 611, avoidance cavity; 612, shaft hole; 621, strip - shaped sliding groove; 622, contact head; 623, elastic sheet; 631, slideway; 632, hinge block; 633, sliding groove; 651, second air inlet and outlet hole; 652, connecting part; 7, fan blade; 71, matching part; 711, retaining strip; 8, cover. Detailed implementation manners

[0019] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following embodiments are combined with the attached Figure 1 to the attached Figure 6 to specifically elaborate on the technical solutions provided by the present invention, but the following content is not a limitation of the present invention.

[0020] Figure 1 Structural diagram of an embodiment of a motor self - cleaning structure for an unmanned aerial vehicle according to the present invention; Figure 2 Cross - sectional view of an embodiment of a motor self - cleaning structure for an unmanned aerial vehicle according to the present invention. As Figure 1 and Figure 2As shown in the figure, the self-cleaning structure of the motor for the drone provided in this embodiment includes: a rotor housing 1, a rotor shaft 2, a coil stator 3, a magnetic ring 4, a PCB board, a bearing bracket 5, a centrifugal contact member 6, and a fan blade 7. At this time, like the external rotor three-phase brushless motor used in existing drones, the rotor housing 1 has an inner cavity, and the rotor shaft 2, the coil stator 3, the magnetic ring 4, the PCB board, and the bearing bracket 5 are all arranged in the inner cavity. Moreover, one end of the rotor shaft 2 is installed on the rotor housing 1, and the magnetic ring 4 is sleeved outside the rotor shaft 2 at intervals and abuts against the inner wall of the rotor housing 1, realizing the fixed installation of the magnetic ring 4 on the inner wall of the rotor housing 1 and providing conditions for the subsequent rotation of the rotor housing 1. In addition, the bearing bracket 5 is rotatably sleeved outside the rotor shaft 2 and several bearings are arranged between the bearing bracket 5 and the rotor shaft 2, so that the rotor shaft 2 can rotate relative to the bearing bracket 5 when the bearing bracket 5 does not move, thus meeting the rotation of the rotor housing 1 connected thereto. In addition, the coil stator 3 is fixedly sleeved outside the bearing bracket 5 and is coaxially arranged with the magnetic ring 4. At the same time, an air gap is provided between the coil stator 3 and the magnetic ring 4. Moreover, the PCB board is fixedly installed on the bearing bracket 5 and is electrically connected to the coil stator 3. The control circuit on the PCB board supplies power to the coil in the coil stator 3 to generate a corresponding magnetic field, so that the magnetic ring 4 makes corresponding movements in the generated magnetic field, thereby enabling the rotor housing 1 to rotate and meeting the power output requirements, so as to provide flight driving force for the drone.

[0021] Specifically, an installation part is provided on the side of the bearing bracket 5 facing away from the PCB board. At this time, the fan blade 7 is rotatably installed on the installation part on the side of the bearing bracket 5 facing away from the PCB board, so that the fan blade 7 can rotate on the installation part, realizing the stable installation of the fan blade 7 and ensuring the smooth rotation of the fan blade 7. Moreover, a matching part 71 is provided on the side of the fan blade 7 facing away from the bearing bracket 5, providing conditions for driving the fan blade 7 to rotate after being connected to the matching part 71 through the centrifugal contact member 6.

[0022] Specifically, the centrifugal contact member 6 that rotates following the rotation of the rotor housing 1 further includes a triggering portion 61 and a contact portion 62. At this time, the triggering portion 61 is arranged in the inner cavity and reciprocates radially along the rotor housing 1. That is, when the rotor housing 1 rotates, the triggering portion 61 moves radially along the rotor housing 1 under the action of centrifugal force, providing conditions for subsequent pushing the contact portion 62 to move or facilitating the reset of the contact portion 62. In addition, the middle of the contact portion 62 is hinged to the rotor housing 1, and one end of the contact portion 62 is connected to the triggering portion 61, so that the triggering portion 61 can drive the contact portion 62 to act when moving. Moreover, the other end of the contact portion 62 selectively contacts the mating portion 71. That is, when the triggering portion 61 drives the contact portion 62 to act by moving, the contact portion 62 can contact or separate from the mating portion 71 of the fan blade 7. Since the centrifugal contact member 6 rotates following the rotor housing 1, the fan blade 7 is driven to rotate, thereby forming an air flow in the inner cavity of the rotor housing 1, and cleaning dust and other impurities attached to the internal structure of the motor, meeting the self-cleaning requirement. And, the distance between the triggering portion 61 and the axis of the rotor housing 1 is proportional to the rotational speed of the rotor housing 1. Since the higher the rotational speed of the rotor housing 1, the greater the centrifugal force received by the triggering portion 61, when the rotor housing 1 rotates at a low speed, the displacement of the triggering portion 61 is small, so that the contact portion 62 cannot contact the mating portion 71 on the fan blade 7, and the fan blade 7 will not rotate, that is, the motor will not perform self-cleaning operation during low-speed operation. At this time, considering that the air flow impact force formed by the fan blade 7 rotating at a low speed is limited and the cleaning effect is not good, and on the contrary, it will increase the power consumption of the motor. And the increased power consumption is relatively large compared with the low power consumption of the motor operation itself at this time, and the reverse effect is significant. When the rotor housing 1 rotates at a high speed, the displacement of the triggering portion 61 increases, so that the contact portion 62 stably contacts the mating portion 71, thereby driving the fan blade 7 to rotate, that is, the motor will perform self-cleaning operation only during high-speed operation. At this time, a strong air flow can be formed for cleaning, and the cleaning effect is better. And the increased power consumption of the motor is relatively small compared with the high power consumption of the current motor operation itself, and the positive effect is more obvious, realizing dynamically meeting the self-cleaning requirement of the motor.

[0023] Figure 3 The structural diagram of the carriage of a preferred embodiment of the present invention. As Figure 2 and Figure 3As shown, a slide 63 is coaxially arranged on the rotor housing 1 and on one side close to the matching portion 71. At this time, the slide 63 is an annular structure as a whole, and the rotor shaft 2 passes through the center of the slide 63, which also provides conditions for the subsequent airflow to smoothly pass through the slide 63. In addition, a plurality of slideways 631 are opened on the slide 63 along its radial direction, and a triggering portion 61 is slidably arranged in each slideway 631. The slideways 631 of the slide 63 provide guidance for the triggering portion 61, ensuring that the movement direction of the triggering portion 61 can be kept stable when performing centrifugal motion, thereby smoothly pushing the corresponding contact portion 62 to move. In addition, the hinged portion of the contact portion 62 is hinged to one side of the slide 631 close to the outer edge of the slide 63, so that the contact portion 62 can form a lever structure, and one end of the contact portion 62 is extended into the slide 631 and is located on the side of the trigger portion 61 away from the axis of the rotor housing 1, thereby realizing the connection between one end of the contact portion 62 and the trigger portion 61, and when the trigger portion 61 moves, it can drive the contact portion 62 to deflect, so that the other end of the contact portion 62 contacts or moves away from the mating portion 71.

[0024] More specifically, a plurality of hinge blocks 632 are provided on the side of the slide 63 close to the fan blade 7, and each slide 631 corresponds to a hinge block 632. At the same time, the contact portion 62 corresponding to the slide 631 is hinged to the rotor housing 1 at a position hinged to the hinge block 632. That is, the hinge block 632 on the slide 63 serves as a supporting structure for the contact portion 62 to be hinged to the rotor housing 1, which meets the requirement of the contact portion 62 rotating with the rotor housing 1 and also provides conditions for the deflection of the contact portion 62 itself.

[0025] More specifically, a limit spring 64 is further provided in each slideway 631 and on the side of the trigger portion 61 away from the axis of the rotor housing 1, and the two ends of the limit spring 64 are respectively pressed against the rotor housing 1 and the trigger portion 61, or the two ends of the limit spring 64 are respectively pressed against the inner wall of the slideway 631 and the trigger portion 61, so that after the trigger portion 61 slides toward the side away from the axis of the rotor housing 1 under the action of centrifugal force, after the rotation speed of the rotor housing 1 is reduced, the trigger portion 61 can be reset under the action of the limit spring 64, thereby driving the contact portion 62 to separate from the matching portion 71, so as to achieve the purpose of not driving the fan blade 7. In addition, the movement of the trigger portion 61 can be limited when the rotation speed of the rotor housing 1 is low, offsetting the smaller centrifugal force applied to the trigger portion 61, so that the contact portion 62 will not contact the matching portion 71 when the motor runs at a low speed, thereby ensuring that the self-cleaning function is not started at a low speed. Preferably, sleeve blocks are provided on the inner wall of the rotor housing 1 or the slide 631 and on the trigger part 61, and the two ends of the limit spring 64 are respectively sleeved on the corresponding sleeve blocks, and the sleeve block and the limit spring 64 are interference fit, thereby realizing a fixed connection between the two ends of the limit spring 64, which can not only improve the installation reliability of the limit spring 64, but also enable the trigger part 61 to be pulled by the limit spring 64, thereby avoiding the problem of the trigger part 61 moving arbitrarily in the slide 631 when the motor is not running, limiting the moving stroke of the trigger part 61, thereby avoiding the problem of the trigger part 61 moving arbitrarily and causing the contact part 62 to deflect arbitrarily and collide with the fan blade 7 due to arbitrary movement of the trigger part 61, and the structural design is more reasonable.

[0026] Figure 4 FIG. 1 is a structural diagram of a trigger unit of a preferred embodiment of the present invention. Figure 2 and Figure 4 As shown, a side of the trigger portion 61 close to the fan blade 7 is provided with an avoidance cavity 611. At this time, the end of the contact portion 62 connected to the trigger portion 61 is extended into the avoidance cavity 611. The avoidance cavity 611 provides sufficient movement space for the end of the contact portion 62 connected to the trigger portion 61, so that the deflection of the contact portion 62 is not affected by the structure of the trigger portion 61 itself, so that the contact portion 62 can deflect smoothly. At the same time, an axial hole 612 connected to the avoidance cavity 611 is provided on the side wall of the trigger portion 61, and a pin 66 extending into the avoidance cavity 611 is installed in the axial hole 612. The pin 66 is connected to the end of the contact portion 62, so that the trigger portion 61 can drive the contact portion 62 to move through the pin 66. At this time, a strip groove 621 is further opened on the end where the contact portion 62 and the trigger portion 61 are connected, and one end of the pin shaft 66 is inserted into the strip groove 621, that is, the movement of the pin shaft 66 in the strip groove 621 adapts to the change in the distance between the contact portion 62 and the pin shaft 66 when the contact portion 62 is deflected, ensuring that the contact portion 62 can be deflected smoothly without getting stuck, and the structural design is more reasonable.

[0027] More specifically, the mating portion 71 on one side of the fan blade 7 is an annular cylinder. At this time, the annular cylinder is sleeved outside the rotor shaft 2, and there is a gap between the annular cylinder and the rotor shaft 2 to ensure that the rotation of the fan blade 7 will not interfere with the rotation of the rotor shaft 2. Moreover, a number of protruding retaining bars 711 are provided on the outer wall of the annular cylinder, and the plurality of retaining bars 711 are distributed in a circular array with the axis of the annular cylinder as the center. Through the retaining bars 711, a number of limiting structures are formed on the outer wall of the annular cylinder. When one end of the contact portion 62 contacts the mating portion 71, the end of the contact portion 62 can be snapped between two adjacent retaining bars 711. The mutual limitation is achieved through the cooperation of the retaining bars 711 and the end of the contact portion 62, so that the contact portion 62 can smoothly drive the fan blade 7 to rotate and realize the self-cleaning operation.

[0028] Figure 5 The structural diagram of the contact portion of a preferred embodiment of the present invention. As Figure 2 and Figure 5 shown, a contact head 622 is further provided at the end of the end of the contact portion 62 that selectively contacts the mating portion 71, and the contact head 622 is selectively snapped between two adjacent retaining bars 711, that is, the contact between the contact portion 62 and the mating portion 71 is realized by the clamping of the contact head 622 between two adjacent retaining bars 711. Moreover, both the contact head 622 and the retaining bars 711 are made of rubber material, so that when the two contact, it is a soft contact, which will not cause too much impact and avoid structural damage.

[0029] Figure 6 is Figure 2 the enlarged view of part A in Figure 2 and Figure 6As shown, the rotor housing 1 is also provided with a heat dissipation slide 65, which is slidably provided at one end of the rotor housing 1 provided with the centrifugal contact member 6, so that the heat dissipation slide 65 can be driven by the triggering part 61 at the same time, thereby realizing the linkage between the heat dissipation slide 65 and the fan blade 7. In addition, a plurality of first inlet and outlet holes 11 are provided on the rotor housing 1 and at one end provided with the centrifugal contact member 6, and at the same time, a plurality of second inlet and outlet holes 651 cooperating with the first inlet and outlet holes 11 are provided on the heat dissipation slide 65. When the first inlet and outlet holes 11 and the second inlet and outlet holes 651 are aligned, the inner cavity is connected with the outside, and when the first inlet and outlet holes 11 and the second inlet and outlet holes 651 are misaligned, the inner cavity is isolated from the outside. In addition, the heat dissipation slide 65 is connected to the trigger part 61, and when the trigger part 61 does not move, the first air inlet and outlet hole 11 and the second air inlet and outlet hole 651 are offset, that is, when the fan blade 7 does not rotate, the first air inlet and outlet hole 11 and the second air inlet and outlet hole 651 are offset, and the inner cavity and the outside are isolated to achieve outer protection. When the trigger part 61 moves and drives the fan blade 7 to rotate through the centrifugal contact piece 6, the trigger part 61 can simultaneously drive the heat dissipation slide 65 to move, so that the first air inlet and outlet hole 11 and the second air inlet and outlet hole 651 are aligned, and the inner cavity and the outside are connected, so as to quickly inhale the outside air to form an airflow, meet the self-cleaning requirements, and also increase the heat dissipation efficiency, and better meet the use requirements of efficient heat dissipation when the motor runs at high speed.

[0030] More specifically, a sliding groove 633 is provided on the slide 63 along the arrangement direction of the slideway 631. At this time, a plurality of connecting parts 652 are provided on one side of the heat dissipation slide 65 close to the trigger part 61, and the connecting parts 652 of the heat dissipation slide 65 are slidably arranged in the sliding groove 633, that is, the sliding installation of the heat dissipation slide 65 on the slide 63 is realized through the connecting parts 652, ensuring that the heat dissipation slide 65 can slide stably. In addition, the heat dissipation slide 65 is also connected to the side of the trigger part 61 away from the contact part 62, meeting the use requirement of the trigger part 61 driving the heat dissipation slide 65 to move, and at the same time realizing the linkage between the heat dissipation slide 65 and the fan blade 7. In addition, the interference of the heat dissipation slide 65 on the movement of the contact part 62 is avoided, and the structural design is more reasonable.

[0031] More specifically, a spring piece 623 is further provided between the contact portion 62 and the contact head 622, and the spring piece 623 is arranged along the tangent direction of the matching portion 71, so that the spring piece 623 can bend within the deflection plane of the contact portion 62, but is not easily deformed in the tangent direction of the matching portion 71. The excessive deflection stroke of the contact portion 62 is offset by elastic deformation, ensuring that even if the motor speed is high and the trigger portion 61 is pushed to the maximum stroke, after the contact portion 62 reaches the maximum deflection angle, the contact portion 62 will not hard squeeze the matching portion 71, thereby preventing damage to the fan blade 7 structure and providing better structural protection.

[0032] More specifically, the rotor housing 1 of the motor is arranged in a barrel shape. At this time, the PCB board is disposed at one end of the barrel opening of the rotor housing 1, realizing a concealed installation of the PCB board in the inner cavity of the rotor housing 1. Moreover, a cover 8 is also provided at the barrel opening of the rotor housing 1. The cover 8 covers the PCB board and is fixedly connected to the bearing bracket 5. By covering one end of the barrel opening of the rotor housing 1 with the cover 8, the external protection ability of the motor is improved. Preferably, along the axial direction of the rotor housing 1, the rim of the barrel opening of the rotor housing 1 extends outside the cover 8, so that the length of the barrel opening of the rotor housing 1 is longer than that of the cover 8, forming a drip edge and other structures, eliminating the problem that rainwater and the like flow into the interior of the motor from the gap between the rotor housing 1 and the cover 8, and having better protection performance. In addition, ventilation holes can be opened on the cover 8, and the ventilation holes communicate the internal and external spaces of the motor, so as to facilitate the rapid discharge of dust and other impurities during the cleaning process.

[0033] The self-cleaning structure of the motor for an unmanned aerial vehicle provided in this embodiment includes a rotor housing 1, a rotor shaft 2, a coil stator 3, a magnetic ring 4, a PCB board, a bearing bracket 5, a centrifugal contact member 6, and a fan blade 7; by providing a synchronously rotatable centrifugal contact member 6 on the rotor housing 1, the centrifugal contact member 6 has a sliding trigger portion 61 and a deflected contact portion 62. At the same time, a fan blade 7 with a mating portion 71 is rotatably mounted on the bearing bracket 5, so that when the rotor housing 1 rotates at a high speed, the deflected contact portion 62 can be driven by the centrifugal motion of the trigger portion 61, and one end of the contact portion 62 can contact the mating portion 71, ensuring that the centrifugal contact member 6 can drive the fan blade 7 to rotate, thereby forming an air flow inside the motor to perform self-cleaning on the interior of the motor, effectively avoiding the risk of damage easily caused by disassembly and assembly of the motor, without the need for professional operation, and also avoiding the problem that the use performance and service life of the motor are affected by accelerated wear due to impurities and the like, and improving the heat dissipation efficiency of the motor under high-load operation.

[0034] The above are only preferred embodiments of the present invention, and thus do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be able to realize that all equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric motor self-cleaning structure for a drone, comprising a rotor housing, a rotor shaft, a coil stator, a magnetic ring, a PCB board and a bearing bracket. The rotor housing has an inner cavity. One end of the rotor shaft is mounted on the rotor housing. The magnetic ring is sleeved outside the rotor shaft at intervals and abuts against the inner wall of the rotor housing. The bearing bracket is rotatably sleeved outside the rotor shaft, and a plurality of bearings are arranged between the bearing bracket and the rotor shaft. The coil stator is fixedly sleeved outside the bearing bracket and is coaxially arranged with the magnetic ring. Moreover, an air gap is arranged between the coil stator and the magnetic ring. The PCB board is fixedly mounted on the bearing bracket and is electrically connected to the coil stator, and it is characterized in that, Also includes centrifugal contacts and fan blades; Wherein, the fan blade is rotatably mounted on a side of the bearing bracket away from the PCB board, and a matching portion is provided on the side of the fan blade away from the bearing bracket; The centrifugal contact piece includes a trigger portion and a contact portion, wherein the trigger portion is arranged in the inner cavity and reciprocates along the radial direction of the rotor housing, the middle portion of the contact portion is hinged on the rotor housing, one end of the contact portion is connected to the trigger portion, and the other end of the contact portion selectively contacts the matching portion, and the distance between the trigger portion and the axis of the rotor housing is proportional to the rotation speed of the rotor housing.

2. The motor self-cleaning structure for a drone according to claim 1, characterized in that, A slide is coaxially arranged on the rotor housing and on a side close to the matching portion, and a plurality of slideways are opened on the slideway along its radial direction. The trigger portion is slidably arranged in each of the slideways, and a hinged portion of the contact portion is hinged to a side of the slideway close to an outer edge of the slideway, and one end of the contact portion extends into the slideway and is located on a side of the trigger portion that is away from the axis of the rotor housing.

3. The motor self-cleaning structure for a drone according to claim 2, wherein, A plurality of hinge blocks are arranged on one side of the slide frame close to the fan blades, and one slideway corresponds to one hinge block. Meanwhile, the part where the contact portion is hinged to the rotor housing is hinged to the hinge block.

4. The motor self-cleaning structure for a drone according to claim 2, characterized in that, A limit spring is also arranged in each slideway and on the side of the triggering part away from the axis of the rotor housing. Two ends of the limit spring respectively abut against the inner wall of the rotor housing or the slideway and the triggering part.

5. The motor self-cleaning structure for a drone according to claim 1, wherein, A avoidance cavity is provided on a side of the trigger portion close to the fan blade, and one end of the contact portion connected to the trigger portion extends into the avoidance cavity. At the same time, an axial hole connected to the avoidance cavity is provided on the side wall of the trigger portion, and a pin shaft extending into the avoidance cavity is installed in the axial hole. A strip slide groove is provided on one end of the contact portion connected to the trigger portion, and one end of the pin shaft penetrates into the strip slide groove.

6. The motor self-cleaning structure for a drone according to claim 1, characterized in that, The matching part is an annular cylinder, which is sleeved outside the rotor shaft, and a plurality of protruding baffles are arranged on the outer wall of the annular cylinder. The baffles are distributed in an annular array with the axis of the annular cylinder as the axis center.

7. The motor self-cleaning structure for a drone according to claim 6, characterized in that, One end of the contact portion that selectively contacts the matching portion is provided with a contact head, and the contact head is selectively inserted between two adjacent blocking bars, and both the contact head and the blocking bars are made of rubber.

8. The motor self-cleaning structure for a drone according to claim 2, characterized in that, It also includes a heat dissipation slide, which is slidably arranged on the end of the rotor housing where the centrifugal contact piece is arranged, and a plurality of first air inlet and outlet holes are opened on the rotor housing and located on the end where the centrifugal contact piece is arranged, and a plurality of second air inlet and outlet holes cooperating with the first air inlet and outlet holes are opened on the heat dissipation slide, the heat dissipation slide is connected to the trigger part, and when the trigger part is not moved, the first air inlet and outlet holes are misaligned with the second air inlet and outlet holes.

9. The motor self-cleaning structure for a drone according to claim 8, wherein, A sliding groove is formed in the carriage along the arrangement direction of the slideway, and the connecting portion of the heat dissipation fin is slidably disposed in the sliding groove. Moreover, the heat dissipation fin is connected to the side of the triggering portion away from the contact portion.

10. The motor self-cleaning structure for a drone according to claim 7, characterized in that, A shrapnel is arranged between the contact portion and the contact head, and the shrapnel is arranged tangentially along the mating portion.

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