Foreign matter prevention structure of motor for unmanned aerial vehicle

Abstract

The invention relates to the technical field of brushless motors, in particular to a foreign matter prevention structure of a motor for an unmanned aerial vehicle, which comprises a base, a rotor assembly and a stator assembly, the base is provided with a disc body part and a central cylinder, the disc body part is provided with a vertical cylinder part, the end part of the vertical cylinder part is provided with a first bending part, and the first bending part is fixedly connected with the vertical cylinder part; the rotor assembly comprises a front cover and a second bending part, the front cover is provided with a concave cavity, a cavity opening of the concave cavity faces the disc body part and covers the center cylinder, the bottom of the front cover and the disc body part are spaced by a preset distance, the front cover is provided with a first annular groove, the first bending part extends into the first annular groove, and a first interval channel is formed between the first bending part and the first annular groove; the second bending part is fixedly connected with the front cover, and a second interval channel is arranged between the second bending part and the first bending part; according to the invention, the first interval channel and the second interval channel are arranged, so that the advantage of better foreign matter blocking effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brushless motors, and more particularly to a foreign matter prevention structure of a motor for a UAV. BACKGROUND

[0002] Brushless motors replace traditional mechanical brushes with electronic commutation, significantly reducing mechanical friction loss, improving energy conversion efficiency, and significantly extending the single flight time of a UAV. Therefore, brushless motors are widely used in UAVs.

[0003] It should be noted that when a UAV flies in a dry and dusty environment such as a desert or a construction site, fine sand particles can easily enter the motor through the heat dissipation holes or gaps, causing bearing wear or degradation of winding insulation performance. In addition, during routine flight, suspended dust in the air can also accumulate for a long time, blocking the heat dissipation channel and accelerating the aging of motor components. In addition, some plant debris and seeds may also be stuck in the motor heat dissipation structure, affecting the heat dissipation efficiency. Therefore, it is necessary to prevent foreign matter from entering the motor.

[0004] Patent document (CN205178814U) discloses a foreign matter prevention brushless motor. Through the cooperation of the annular boss and the annular groove, the annular boss of the stator seat blocks the gap between the conventional stator and the rotor. The annular groove and the annular boss enclose the rotor and the stator seat into a sealed cavity, and the annular groove rotates on the annular boss to reduce the probability of foreign matter such as wind sand or water droplets entering the rotor or the stator from the intersection of the rotor and the stator seat. However, as can be seen from Figure 4 of the specification drawings, there is only one passage between the annular boss and the annular groove, and the blocking effect needs to be improved.

[0005] Therefore, there is a need to provide a foreign matter prevention structure of a motor for a UAV, which has better blocking effect, and can also dissipate heat and remove dust. SUMMARY

[0006] The application aims to provide an anti-foreign matter structure of a motor for a UAV, wherein the anti-foreign matter structure of the motor for the UAV comprises a base, a rotor assembly and a stator assembly, the base has a disc body and a central cylinder, the central cylinder is located at the center of the disc body, the disc body has a vertical cylinder portion, the end of the vertical cylinder portion is provided with a first bending portion, the first bending portion is located on the side of the vertical cylinder portion close to the central axis of the vertical cylinder portion, and the first bending portion is fixedly connected with the vertical cylinder portion; the rotor assembly comprises a front cover, a rotating shaft, a rotor core and a second bending portion, the rotating shaft is rotatably installed on the central cylinder, and the rotating shaft penetrates through the front cover, the front cover has a cavity, the cavity is open towards the disc body and covers the central cylinder, the bottom of the front cover is spaced apart from the disc body by a predetermined distance, the rotor core is installed on the side wall of the cavity, the front cover has a first annular groove, the first bending portion extends into the first annular groove, and the first annular groove has a first spacing channel between the first bending portion and the first annular groove, the second bending portion is fixedly connected with the front cover, and the second bending portion has a second spacing channel between the first bending portion and the second bending portion; the stator assembly comprises a stator core and a coil, the stator core is sleeved on the central cylinder, and the coil is wound on the stator core, the rotor core is located outside the stator assembly, and the first spacing channel and the second spacing channel are provided to achieve the advantage of better blocking foreign matter.

[0007] Another purpose of the application is to provide an anti-foreign matter structure of a motor for a UAV, wherein the cavity wall has a first gear portion, a plurality of gear shafts are rotatably installed on the front cover, the gear shafts have unidirectional fan blades, the front cover has a plurality of air outlet channels, the air outlet channels are located on the air outlet side of the unidirectional fan blades, the air outlet channels are communicated with the first spacing channel, when the front cover rotates, the gear shafts rotate circumferentially and drive hot air to flow out of the air outlet channels, blow away the dust accumulated in the second spacing channel, and achieve the advantages of heat dissipation and dust removal.

[0008] Another object of the present application is to provide a foreign matter prevention structure for a motor of a UAV, wherein the recessed cavity is provided with a plurality of first sliding grooves and a plurality of first guide grooves near one end of the disc body, the first guide grooves extend from the groove walls of the first sliding grooves to the direction close to the central axis of the central cylinder for a predetermined distance, the foreign matter prevention structure for the motor of the UAV comprises a plurality of shaft seats and a plurality of thermal expansion members, each of the first sliding grooves is provided with a shaft seat, each of the first guide grooves is provided with a thermal expansion member, the gear shaft is rotatably installed on the shaft seat, and when the thermal expansion member is heated and expanded, the corresponding shaft seat slides in the direction away from the central axis of the central cylinder for a predetermined distance, and the gear part on the gear shaft is engaged with the first gear part, so that the thermal expansion member and the shaft seat are provided, and the gear shaft is allowed to rotate circumferentially only when the temperature in the recessed cavity is high.

[0009] In order to achieve the above-mentioned at least one object, the present application provides a foreign matter prevention structure for a motor of a UAV, wherein the foreign matter prevention structure for the motor of the UAV comprises: a base, the base is provided with a disc body and a central cylinder, the central cylinder is located at the center of the disc body, the disc body is provided with a vertical cylinder, the end of the vertical cylinder is provided with a first bending part, the first bending part is located on one side of the vertical cylinder close to the central axis of the vertical cylinder, and the first bending part is fixedly connected with the vertical cylinder; a rotor assembly, the rotor assembly comprises a front cover, a rotating shaft, a rotor core and a second bending part, the rotating shaft is rotatably installed on the central cylinder, the rotating shaft penetrates through the front cover, the front cover is provided with a recessed cavity, the cavity opening of the recessed cavity faces the disc body and covers the central cylinder, the bottom of the front cover is spaced apart from the disc body by a predetermined distance, the rotor core is installed on the side wall of the recessed cavity, the front cover is provided with a first annular groove, the first bending part extends into the first annular groove, and the first bending part and the first annular groove are provided with a first spacing channel, the second bending part is fixedly connected with the front cover, and the second bending part and the first bending part are provided with a second spacing channel; a stator assembly, the stator assembly comprises a stator core and a coil, the stator core is sleeved on the central cylinder, and the coil is wound on the stator core, and the rotor core is located outside the stator assembly.

[0010] In one or more embodiments of the present application, the cavity wall of the recessed cavity is provided with a first gear part, a plurality of gear shafts are rotatably installed on the front cover, the gear shafts are provided with unidirectional fan blades, the front cover is provided with a plurality of air outlet channels, the air outlet channels are located on the air outlet side of the unidirectional fan blades, and the air outlet channels are communicated with the first spacing channel.

[0011] In one or more embodiments of the present application, the recess is provided with a plurality of first sliding grooves and a plurality of first guide grooves near one end of the disc body, the first guide grooves extend from the groove walls of the first sliding grooves to the direction close to the central axis of the central cylinder by a predetermined distance, the anti-foreign matter structure of the motor for the unmanned aerial vehicle comprises a plurality of shaft seats and a plurality of thermal expansion members, each of the first sliding grooves is slidably provided with one of the shaft seats, each of the first guide grooves is provided with one of the thermal expansion members, the gear shaft is rotatably installed on the shaft seat, and when the thermal expansion member is heated and expanded, the corresponding shaft seat slides by a predetermined distance in the direction away from the central axis of the central cylinder, and the gear part on the gear shaft is engaged with the first gear part.

[0012] In one or more embodiments of the present application, the other end groove wall of the first sliding groove is further provided with a plurality of accommodating grooves, the anti-foreign matter structure of the motor for the unmanned aerial vehicle further comprises elastic members, the elastic members are arranged in the accommodating grooves, and the two ends of the elastic members are respectively abutted against the groove walls of the accommodating grooves and the shaft seats.

[0013] In one or more embodiments of the present application, the anti-foreign matter structure of the motor for the unmanned aerial vehicle further comprises a plurality of heat-conducting members, one end of the heat-conducting member is fixedly connected with the thermal expansion member, and the other end of the heat-conducting member extends out of the front cover by a predetermined distance.

[0014] In one or more embodiments of the present application, the top of the gear shaft is rotatably installed with an L-shaped member, one end of the L-shaped member is provided with a sealing member, and the air outlet channel is a stepped hole, when the shaft seat slides, the sealing member blocks or closes the stepped hole.

[0015] In one or more embodiments of the present application, the anti-foreign matter structure of the motor for the unmanned aerial vehicle further comprises a guide ring, the guide ring is fixedly connected with the cavity wall of the recess, one side of the guide ring close to the cavity wall of the recess is provided with a third annular groove, and the third annular groove is communicated with the air outlet channel.

[0016] In one or more embodiments of the present application, one side of the third annular groove close to the central cylinder is provided with a guide arc surface.

[0017] The anti-foreign matter structure of the motor for the unmanned aerial vehicle comprises a base, a rotor assembly and a stator assembly, the base has a disc body part and a central cylinder, the central cylinder is located at the center of the disc body part, the disc body part has a vertical cylinder part, the end part of the vertical cylinder part is provided with a first bending part, the first bending part is located on the side of the vertical cylinder part close to the central axis of the vertical cylinder part, and the first bending part is fixedly connected with the vertical cylinder part; the rotor assembly comprises a front cover, a rotating shaft, a rotor iron core and a second bending part, the rotating shaft is rotatably installed on the central cylinder, the rotating shaft penetrates through the front cover, the front cover has a concave cavity, the cavity opening of the concave cavity faces the disc body part and covers the central cylinder, the bottom part of the front cover is spaced apart from the disc body part by a predetermined distance, the rotor iron core is installed on the side wall of the concave cavity, the front cover has a first annular groove, the first bending part extends into the first annular groove, and the first annular groove is provided with a first spacing channel between the first bending part and the first annular groove, the second bending part is fixedly connected with the front cover, and the second bending part is provided with a second spacing channel between the first bending part and the second bending part; the stator assembly comprises a stator iron core and a coil, the stator iron core is sleeved on the central cylinder, and the coil is wound on the stator iron core, the rotor iron core is located outside the stator assembly, and the first spacing channel and the second spacing channel are provided, so that the advantage of better blocking foreign matter effect is realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which: Figure 1 Fig. 1 illustrates a cross-sectional view of an anti-foreign matter structure of a motor for an unmanned aerial vehicle according to an embodiment of the present application; Figure 2 Fig. 2 illustrates a partial enlarged view of C of Fig. 1; Figure 1 Figure 3 Fig. 4 illustrates a structural schematic view of the first bending part and the second bending part. DETAILED DESCRIPTION

[0019] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and consistent understanding of the present application. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purpose only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0020] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0021] ​Although numerals such as "first", "second" and the like will be used to describe various components, those numerals are not meant to limit those components. The terms are used only to distinguish one component from another. For example, a first component could be termed a second component, and, likewise, a second component could be termed a first component, without departing from the teachings of the present inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "has", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0023] An anti-foreign matter structure of an electric machine for an unmanned aerial vehicle, refer to Figures 1 to 3 An anti-foreign matter structure of an electric machine for an unmanned aerial vehicle, refer to

[0024] Specifically, as Figure 1As shown, the base 10 has a disc body 101 and a center cylinder 102 located at the center of the disc body 101, the disc body 101 has a vertical cylinder part 1011, the end of the vertical cylinder part 1011 is provided with a first bending part 1012 located on one side of the vertical cylinder part 1011 close to the central axis of the vertical cylinder part 1011, and the first bending part 1012 is fixedly connected with the vertical cylinder part 1011. In addition, the rotor assembly 20 includes a front cover 201, a rotating shaft 202, a rotor core 203 and a second bending part 204, the rotating shaft 202 is rotatably installed on the center cylinder 102, and the rotating shaft 202 penetrates the front cover 201, the front cover 201 has a concave cavity 2011, the cavity opening of the concave cavity 2011 faces the disc body 101 and covers the center cylinder 102, the bottom of the front cover 201 is spaced apart from the disc body 101 by a predetermined distance, the rotor core 203 is installed on the side wall of the concave cavity 2011, the front cover 201 has a first annular groove 2012, the first bending part 1012 extends into the first annular groove 2012, and the first bending part 1012 and the first annular groove 2012 have a first spacing channel 103 therebetween, the second bending part 204 is fixedly connected with the front cover 201, and the second bending part 204 and the first bending part 1012 have a second spacing channel 104 therebetween. In addition, the stator assembly 30 includes a stator core 301 and a coil 302, the stator core 301 is sleeved on the center cylinder 102, the coil 302 is wound on the stator core 301, and the rotor core 203 is located outside the stator assembly 30.

[0025] It should be noted that the first bending part 1012 is formed by two first semicylinder pieces which are symmetrically spliced with each other and formed after fixed connection, as shown in Figure 3As shown, each first half-cylinder piece includes a first straight cylinder segment 10121, a first horizontal turning ear 10122 and a second horizontal turning ear 10123, the side walls of the top and bottom of the first straight cylinder segment 10121 are fixedly connected with the first horizontal turning ear 10122 and the second horizontal turning ear 10123 respectively; the second bending part 204 is formed by symmetrically splicing two second half-cylinder pieces and fixedly connecting them, each second half-cylinder piece includes a second straight cylinder segment 2041 and a third horizontal turning ear 2042. It should be added that, during installation, the two first half-cylinder pieces are sleeved at the first annular groove 2012, the inner hole wall of the first straight cylinder segment 10121 is spaced apart from the bottom wall of the first annular groove 2012 by a predetermined distance, the top surface of the first horizontal turning ear 10122 and the bottom surface of the second horizontal turning ear 10123 are spaced apart from the two side walls of the first annular groove 2012 by a predetermined distance respectively, and the second horizontal turning ear 10123 abuts against the vertical cylinder part 1011, the second horizontal turning ear 10123 is fixedly connected with the vertical cylinder part 1011 by welding or other methods, and the two first half-cylinder pieces are welded with each other; then, the two second half-cylinder pieces are sleeved outside the first bending part 1012, and the third horizontal turning ear 2042 is located between the first horizontal turning ear 10122 and the second horizontal turning ear 10123, then the two second half-cylinder pieces are welded with each other and fixedly connected with the front cover 201. It can be seen that, by arranging the first bending part 1012, the second bending part 204 and the first annular groove 2012, the first spacing channel 103 and the second spacing channel 104 are formed, which reduces the risk of foreign matter entering the recess cavity 2011 in the form of a labyrinth seal, and has the advantage of better blocking foreign matter effect compared with the prior art.

[0026] Further, as shown in the drawings, Figure 2 The recess cavity 2011 has a first gear part 2013 on the cavity wall, the front cover 201 also has a plurality of gear shafts 2014 rotatably installed thereon, the gear shafts 2014 have unidirectional fan blades 2015 thereon, the front cover 201 has a plurality of air outlet channels 2016, the air outlet channels 2016 are located on the air outlet side of the unidirectional fan blades 2015, and the air outlet channels 2016 communicate with the first spacing channel 103.

[0027] It should be noted that when the coil 302 is powered, the front cover 201 rotates circumferentially, at this time, if the gear part on the gear shaft 2014 is engaged with the first gear part 2013, the gear shaft 2014 rotates circumferentially and drives the one-way fan blade 2015 to rotate circumferentially. It should be noted that the hot air in the recessed cavity 2011 is discharged to the air outlet passage 2016 through the one-way fan blade 2015, which not only dissipates heat but also blows dust and foreign matter accumulated on the second interval passage 104 to the outside, reducing the risk of the second interval passage 104 being blocked by dust and foreign matter.

[0028] It should also be noted that if the first gear part 2013 is always engaged with the gear part on the gear shaft 2014, the circumferential rotation of the front cover 201 has a larger load in normal state, which reduces the output power of the rotating shaft 202. Therefore, in the embodiment of the present application, the first gear part 2013 is not always engaged with the gear part on the gear shaft 2014, but only when the temperature in the recessed cavity 2011 is relatively high, the first gear part 2013 is engaged with the gear part on the gear shaft 2014.

[0029] Specifically, as shown in Figure 2 the recessed cavity 2011 near one end of the disc body part 101 has a plurality of first sliding grooves 2017 and a plurality of first guide grooves 2018, the first guide grooves 2018 extend from the groove wall of the first sliding groove 2017 to the direction close to the center axis of the center cylinder 102 for a predetermined distance, the anti-foreign matter structure of the unmanned aerial vehicle motor includes a plurality of shaft seats 70 and a plurality of thermal expansion pieces 50, each first sliding groove 2017 is slidably provided with a shaft seat 70, and each first guide groove 2018 is provided with a thermal expansion piece 50, the gear shaft 2014 is rotatably installed on the shaft seat 70, when the thermal expansion piece 50 is heated and expanded, the corresponding shaft seat 70 slides away from the center axis of the center cylinder 102 by a predetermined distance, and the gear part of the gear shaft 2014 is engaged with the first gear part 2013.

[0030] It should be noted that when the temperature in the recessed cavity 2011 is relatively high, the thermal expansion piece 50 is heated and expanded, and provides a pushing force to the shaft seat 70, so as to make the shaft seat 70 slide away from the center axis of the center cylinder 102, and make the gear part on the gear shaft 2014 engage with the first gear part 2013, at this time, the circumferential rotation of the front cover 201 drives the gear shaft 2014 to rotate circumferentially, and drives the one-way blade 2015 to rotate circumferentially. Under normal circumstances, the volume of the thermal expansion piece 50 is not expanded, and the gear part on the gear shaft 2014 is spaced apart from the first gear part 2013 by a predetermined distance.

[0031] Further, the other end of the first chute 2017 is provided with a plurality of accommodating grooves 2019, and the anti-foreign matter structure of the motor for the unmanned aerial vehicle further comprises an elastic member (not shown in the figure), which is arranged in the accommodating grooves 2019 and the two ends of the elastic member are respectively in abutment with the groove wall of the accommodating grooves 2019 and the shaft seat 70.

[0032] It should be noted that when the temperature in the cavity 2011 is reduced and the thermal expansion member 50 returns to its original state, the shaft seat 70 slides to the center cylinder 102 under the elastic force of the elastic member, and the gear part on the gear shaft 2014 is separated from the first gear part 2013.

[0033] Further, in order to enable the thermal expansion member 50 to respond in time when the air temperature in the cavity 2011 is high, the cavity 2011 is provided with a plurality of heat-conducting members 501, one end of each of the heat-conducting members 501 is fixedly connected with the thermal expansion member 50, and the other end of each of the heat-conducting members 501 extends out of the front cover 201 by a predetermined distance, and the material of the heat-conducting members 501 is preferably copper. Figure 2

[0034] Further, in order to avoid that the air outlet channel 2016 is in communication with the first spacing channel 103 in normal state, the top of the gear shaft 2014 is rotatably provided with an L-shaped member 40 through a bearing, one end of the L-shaped member 40 is provided with a sealing member 401, and the air outlet channel 2016 is a stepped hole, and when the shaft seat 70 slides, the sealing member 401 blocks or closes the stepped hole. Figure 2

[0035] It should be noted that in normal state, the sealing member 401 blocks the air outlet channel 2016, so as to avoid that foreign matters directly enter the cavity 2011 along the first spacing channel 103 and the air outlet channel 2016; when the thermal expansion member 50 pushes the shaft seat 70 to move away from the center cylinder 102, the sealing member 401 opens the air outlet channel 2016, so as to facilitate the unidirectional fan blade 2015 to blow hot air along the air outlet channel 2016 to the first spacing channel 103 and the second spacing channel 104; in addition, since one end of the L-shaped member 40 is rotatably arranged on the center of the gear shaft 2014 through a bearing, when the gear shaft 2014 rotates circumferentially, the L-shaped member 40 does not rotate circumferentially, and when the gear shaft 2014 slides, the L-shaped member 40 slides.

[0036] Further, in order to make the hot air blow more to the air outlet channel 2016 after the unidirectional fan blade 2015 rotates, the cavity 2011 is provided with a plurality of air outlet channels 2016, and the air outlet channels 2016 are arranged in the first spacing channel 103 and the second spacing channel 104. Figure 2 ​​As shown, the anti-foreign matter structure of the motor for the unmanned aerial vehicle further comprises a guide ring 60, the guide ring 60 is fixedly connected with the cavity wall of the concave cavity 2011, and the guide ring 60 is provided with a third annular groove 601 on the side close to the cavity wall of the concave cavity 2011, and the third annular groove 601 is in communication with the air outlet channel 2016.

[0037] Specifically, as shown in Figure 2 The third annular groove 601 is provided with a guide arc surface 6011 on the side close to the center cylinder 102.

[0038] In summary, the anti-foreign matter structure of the motor for the unmanned aerial vehicle based on the embodiments of the present application is illustrated, which has better blocking foreign matter effect, and has the advantages of heat dissipation, dust removal and the like.

[0039] It is worth mentioning that, in the embodiments of the present application, the anti-foreign matter structure of the motor for the unmanned aerial vehicle has simple structure, does not involve complex manufacturing process and expensive materials, and has higher economy. At the same time, for the manufacturers, the anti-foreign matter structure of the motor for the unmanned aerial vehicle provided by the present application is easy to produce and has low cost, which is more conducive to controlling the production cost, and is further conducive to the product promotion and use.

[0040] Those skilled in the art should understand that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The purpose of the present application has been completely and effectively achieved. The function and structural principle of the present application has been shown and explained in the embodiments, and the embodiments of the present application can be any modification or modification without departing from the principle.

Claims

1. A foreign object protection structure for a motor used in unmanned aerial vehicles, characterized in that: The foreign object protection structure for the UAV motor includes The base has a disc body and a central cylinder. The central cylinder is located at the center of the disc body. The disc body has a vertical cylinder. The end of the vertical cylinder is provided with a first bend. The first bend is located on the side of the vertical cylinder close to the central axis of the vertical cylinder. The first bend is fixedly connected to the vertical cylinder. A rotor assembly includes a front cover, a rotating shaft, a rotor core, and a second bent portion. The rotating shaft is rotatably mounted on the central cylinder and passes through the front cover. The front cover has a cavity with its opening facing the disk body and covering the central cylinder. The bottom of the front cover is spaced a predetermined distance from the disk body. The rotor core is mounted on the side wall of the cavity. The front cover has a first annular groove. The first bent portion extends into the first annular groove and has a first gap channel between the first bent portion and the first annular groove. The second bent portion is fixedly connected to the front cover and has a second gap channel between the second bent portion and the first bent portion. A stator assembly, comprising a stator core and coils, wherein the stator core is sleeved on the central cylinder, the coils are wound around the stator core, and the rotor core is located outside the stator assembly.

2. The foreign object protection structure for a drone motor according to claim 1, characterized in that: The cavity wall has a first gear section, and several gear shafts are rotatably mounted on the front cover. Each gear shaft has a one-way fan blade, and the front cover has several air outlet channels. The air outlet channels are located on the air outlet side of the one-way fan blades and are connected to the first spaced channel.

3. The foreign object protection structure for a drone motor according to claim 2, characterized in that: The cavity near the end of the disc has several first sliding grooves and several first guide grooves. The first guide grooves extend a predetermined distance from the groove wall of the first sliding groove towards the central axis of the central cylinder. The anti-foreign object structure of the UAV motor includes several bearing seats and several thermal expansion members. Each of the first sliding grooves has a bearing seat slidably disposed therein, and each of the first guide grooves has a thermal expansion member disposed therein. The gear shaft is rotatably mounted on the bearing seat. When the thermal expansion member expands due to heat, the corresponding bearing seat slides a predetermined distance away from the central axis of the central cylinder, and the gear part on the gear shaft meshes with the first gear part.

4. The foreign object protection structure for a drone motor according to claim 3, characterized in that: The other end of the first chute has several receiving slots. The anti-foreign object structure of the UAV motor also includes an elastic element. The elastic element is disposed in the receiving slot, and the two ends of the elastic element abut against the groove wall of the receiving slot and the bearing seat, respectively.

5. The foreign object protection structure for a drone motor according to claim 3, characterized in that: The anti-foreign object structure of the motor for the drone also includes several heat-conducting components. One end of each heat-conducting component is fixedly connected to the thermal expansion component, and the other end of each heat-conducting component extends a predetermined distance from the front cover.

6. The foreign object protection structure for a drone motor according to claim 3, characterized in that: An L-shaped component is rotatably mounted on the top of the gear shaft. One end of the L-shaped component has a seal. The air outlet channel is a stepped hole. When the shaft seat slides, the seal isolates or closes the stepped hole.

7. The foreign object protection structure for a drone motor according to claim 3, characterized in that: The foreign object protection structure for the drone motor also includes a guide ring, which is fixedly connected to the cavity wall of the cavity. The guide ring has a third annular groove on the side near the cavity wall, and the third annular groove is connected to the air outlet channel.

8. The foreign object protection structure for a drone motor according to claim 8, characterized in that: The third annular groove has a guiding arc surface on the side near the central cylinder.

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