A brushless motor for drone

Abstract

The present invention relates to the field of motor technology, and specifically to a brushless motor for drones, which solves the problems that the existing brushless motors for drones are in use, such as the complex flight environment of the drone, which makes the interior of the brushless motor susceptible to interference from dust and rainwater, and the high rotor speed, which can easily lead to a reduction in the lubrication effect of the bearings after long-term use, thereby affecting the life of the bearings. A brushless motor for drones includes a protective isolation mechanism, an outer rotor mechanism, and a circulating lubrication mechanism. The inner side of the protective isolation mechanism is equipped with an outer rotor mechanism, the inner side of the bottom end of the outer rotor mechanism is equipped with an inner stator mechanism, and the upper and lower ends of the inner stator mechanism are equipped with circulating lubrication mechanisms. The present invention isolates and protects the brushless motor, effectively preventing the entry of external dust and rainwater from interfering with the electrical components, while facilitating the heat dissipation of the motor, and can continuously add lubricating grease to the bearings inside the motor to maintain the lubrication service life of the bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a brushless motor for a drone. Background Art

[0002] The market for drones is becoming more and more extensive. Drones usually use brushless motors to drive the rotors. Brushless motors are electric motors without brushes, mainly composed of a motor body and a driver. There are no brushes or commutators between its rotor and stator. The direction of the winding current is converted by providing direct current in all directions through the controller. Brushless motors use built-in sensors and electronic commutators for electronic commutation to eliminate brush wear and noise generated by brush contact. The advantages of brushless motors include almost no friction loss during operation, high energy conversion efficiency, low maintenance cost, higher reliability, and very broad application prospects.

[0003] During the use of existing brushless motors for drones, the flight environment of drones is complex, which makes the interior of the brushless motors susceptible to interference from dust and rain, and the rotor speed is high. Long-term use can easily lead to a decrease in the lubrication effect of the bearings, thereby affecting the life of the bearings. Therefore, it does not meet the existing needs. In this regard, we propose a brushless motor for drones. Summary of the invention

[0004] The purpose of the present invention is to provide a brushless motor for a drone, so as to solve the problems of the existing brushless motor for a drone mentioned in the above background technology. During use, the flight environment of the drone is complex, which makes the interior of the brushless motor susceptible to interference from dust and rain, and the rotor speed is high. Long-term use can easily lead to a reduction in the lubrication effect of the bearing, thereby affecting the life of the bearing.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brushless motor for a drone, comprising a protective isolation mechanism, an outer rotor mechanism and a circulating lubrication mechanism, wherein the inner side of the protective isolation mechanism is equipped with an outer rotor mechanism, the inner side of the bottom end of the outer rotor mechanism is equipped with an inner stator mechanism, and the upper and lower ends of the inner stator mechanism are both equipped with circulating lubrication mechanisms, the protective isolation mechanism comprises a second protective cover, the upper end of the second protective cover is fixedly equipped with a first protective cover, the inner stator mechanism comprises a fixed shell, the fixed shell is fixedly connected to the second protective cover, the inner sides of the upper and lower ends of the fixed shell are both fixedly equipped with connecting bearings, the outer side of the upper end of the fixed shell is fixedly equipped with a coil winding, and the side of the fixed shell is fixedly equipped with a plurality of arc-shaped guide seats;

[0006] The circulating lubrication mechanism includes a sealing cover, which is fixedly connected to the fixed shell, a lubrication storage bin is provided between the sealing cover and the fixed shell, a filter hollow ring and a centrifugal push frame are installed on the inner side of the lubrication storage bin, an annular filter element is installed on the inner side of the filter hollow ring, a retention groove is provided on the inner side of the annular filter element, and a plurality of guide holes are provided on the upper and lower end surfaces of the filter hollow ring.

[0007] Preferably, the protective isolation mechanism also includes a heat-conducting module connected to the inner side of the bottom end of the second protective cover, the heat-conducting module includes a first heat-conducting ring, a second heat-conducting ring is installed above the first heat-conducting ring, two transmission tubes are arranged between the first heat-conducting ring and the second heat-conducting ring, and a plurality of annular heat-conducting fins are arranged on the lower end surface of the first heat-conducting ring and the upper end surface of the second heat-conducting ring, and the sizes of the plurality of annular heat-conducting fins increase successively from the inside to the outside.

[0008] Preferably, the outer rotor mechanism includes an output shaft, which is inserted into the inner sides of two connecting bearings, and a plurality of guide grooves are provided on the outer side of the middle part of the output shaft, a movable shell is fixedly installed on the outer side of the upper end of the output shaft, a fan frame is installed above the movable shell, and a plurality of arc-shaped magnet sheets are fixedly installed on the inner wall of the bottom end of the movable shell.

[0009] Preferably, the coil winding comprises a silicon steel sheet group, wherein the silicon steel sheet group is formed by stacking a plurality of silicon steel sheets in sequence from bottom to top, and a plurality of enameled wires are wound around the outer side of the silicon steel sheet group.

[0010] Preferably, the bottom ends of the two transmission tubes pass through the fixed shell and the second protective cover and are fixedly connected to the first heat-conducting ring. The interiors of the first heat-conducting ring and the second heat-conducting ring are through-connected through two transmission tubes. The interiors of the first heat-conducting ring, the second heat-conducting ring and the transmission tubes are filled with heat-conducting liquid.

[0011] Preferably, an annular groove is provided at the bottom end of the movable shell, the upper ends of the plurality of arc-shaped guide seats are plugged into the inner side of the annular groove, the movable shell rotates relative to the axis of the fixed shell, and the fan frame is fixedly connected to the output shaft.

[0012] Preferably, the surfaces of the movable shell and the fixed shell are both provided with a plurality of hollow holes, and the fixed shell is rotatably connected to the output shaft via two connecting bearings.

[0013] Preferably, the two lubrication storage bins are connected through a plurality of guide grooves, and the inner sides of the lubrication storage bins and the guide grooves are filled with lubrication grease.

[0014] Preferably, a sealing ring is provided between the sealing cover and the output shaft, the centrifugal push frame is fixedly connected to the output shaft, the filtering hollow ring is threadedly connected to the sealing cover, and the annular filter element is inserted between the filtering hollow ring and the sealing cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can seal and protect the whole through the first protective cover and the second protective cover, effectively preventing the entry of external dust and rainwater during the operation of the drone from interfering with the electrical components. A plurality of hollow holes are provided on the surface of the movable shell and the fixed shell, so that the motor as a whole can be continuously ventilated through the hollow holes during the rotation of the fan frame. The first heat-conducting collar, the second heat-conducting collar and the two transmission tubes are filled with heat-conducting liquid, and then when the fan frame is ventilated, the heat generated by the internal operation of the motor can be continuously output through a plurality of annular heat-conducting fins, effectively improving the heat dissipation effect;

[0017] 2. The present invention connects two lubrication storage bins through a plurality of guide grooves. The inner side of the lubrication storage bins is filled with lubricating grease, so that when the output shaft drives the centrifugal push frame to rotate, the centrifugal push frame can push the lubricating grease to flow into the guide groove, thereby continuously lubricating and replenishing the two connected bearings, maintaining the lubrication stability of the connected bearings. After being guided through the guide holes, the lubricating grease contacts the annular filter element, thereby realizing automatic filtration of the lubricating grease by the annular filter element and retaining impurities through the retention groove, thereby keeping the lubricating grease clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic cross-sectional structure diagram of the present invention as a whole;

[0020] Figure 3 It is a structural schematic diagram of the movable shell of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the fixed shell of the present invention;

[0022] Figure 5 It is a schematic diagram of the installation structure of the coil winding of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the heat conduction module of the present invention;

[0024] Figure 7 For the present invention Figure 6 Schematic diagram of the cross-sectional structure of area A in the middle;

[0025] Figure 8 It is a structural schematic diagram of the centrifugal push frame of the present invention.

[0026] In the figure: 1. protective isolation mechanism; 101. first protective cover; 102. second protective cover; 103. first heat-conducting sleeve ring; 104. second heat-conducting sleeve ring; 105. annular heat-conducting fin; 106. transmission pipe; 2. outer rotor mechanism; 201. output shaft; 202. fan frame; 203. movable shell; 204. arc-shaped magnet sheet; 205. guide groove; 3. inner stator mechanism; 301. fixed shell; 302. connecting bearing; 303. coil winding; 304. arc-shaped guide seat; 4. circulating lubrication mechanism; 401. sealing cover; 402. centrifugal push frame; 403. lubrication storage bin; 404. hollow filter ring; 405. annular filter element; 406. retention groove; 407. guide hole. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] See also Figure 1 , Figure 2 and Figure 6 , an embodiment provided by the present invention: a brushless motor for a drone, comprising a protective isolation mechanism 1, an outer rotor mechanism 2 and a circulating lubrication mechanism 4, the outer rotor mechanism 2 is installed on the inner side of the protective isolation mechanism 1, the inner side of the bottom end of the outer rotor mechanism 2 is installed on the inner side of the inner stator mechanism 3, the upper and lower ends of the inner stator mechanism 3 are both installed with circulating lubrication mechanisms 4, the protective isolation mechanism 1 comprises a second protective cover 102, the upper end of the second protective cover 102 is fixedly mounted with a first protective cover 101, the first protective cover 101 and the second protective cover 102 can be used to seal and protect the whole, effectively preventing the entry of external dust and rainwater during the operation of the drone from interfering with the electrical components;

[0029] A heat conduction module is installed on the inner side of the bottom end of the second protective cover 102, and the heat conduction module includes a first heat conduction ring 103, a second heat conduction ring 104 is installed above the first heat conduction ring 103, and two transmission tubes 106 are arranged between the first heat conduction ring 103 and the second heat conduction ring 104. The lower end surface of the first heat conduction ring 103 and the upper end surface of the second heat conduction ring 104 are provided with a plurality of annular heat conduction fins 105, and the sizes of the plurality of annular heat conduction fins 105 increase from the inside to the outside. The interior of the first heat conduction ring 103 and the second heat conduction ring 104 are connected through the two transmission tubes 106, and the interiors of the first heat conduction ring 103, the second heat conduction ring 104 and the transmission tube 106 are filled with heat conduction liquid. The heat generated by the internal operation of the motor can be continuously output through the plurality of annular heat conduction fins 105, thereby effectively improving the heat dissipation effect.

[0030] See also Figures 2 to 5The inner stator mechanism 3 includes a fixed shell 301, which is fixedly connected to the second protective cover 102. The bottom ends of the two transmission tubes 106 penetrate the fixed shell 301 and the second protective cover 102 and are fixedly connected to the first heat-conducting sleeve ring 103. The inner sides of the upper and lower ends of the fixed shell 301 are fixedly installed with connecting bearings 302. The outer side of the upper end of the fixed shell 301 is fixedly installed with a coil winding 303. The coil winding 303 includes a silicon steel sheet group. The silicon steel sheet group is composed of a plurality of silicon steel sheets stacked in sequence from bottom to top. A plurality of enameled wires are wound around the outer side of the silicon steel sheet group. A plurality of arc-shaped guide holders 304 are fixedly provided on the side of the fixed shell 301. The plurality of arc-shaped guide holders 304 can guide the fixed shell 301 when it rotates, so as to keep the fixed shell 301 stable in rotation.

[0031] See also Figures 2 to 8 The outer rotor mechanism 2 includes an output shaft 201, which is plugged into the inner sides of two connecting bearings 302. A sealing ring is provided between the sealing cover 401 and the output shaft 201. The centrifugal push frame 402 is fixedly connected to the output shaft 201. A plurality of guide grooves 205 are provided on the outer side of the middle part of the output shaft 201. Two lubricating storage bins 403 are connected through the plurality of guide grooves 205. The inner sides of the lubricating storage bins 403 and the guide grooves 205 are filled with lubricating grease. The guide grooves 205 facilitate the diversion of the lubricating grease, thereby improving the contact effect between the lubricating grease and the two connecting bearings 302.

[0032] A movable shell 203 is fixedly installed on the outer side of the upper end of the output shaft 201, and an annular groove is arranged at the bottom end of the movable shell 203. The upper ends of a plurality of arc-shaped guide seats 304 are all plugged into the inner side of the annular groove. The movable shell 203 rotates relative to the axis of the fixed shell 301. The fixed shell 301 is rotatably connected to the output shaft 201 through two connecting bearings 302. The two connecting bearings 302 can maintain the stability of the output of the output shaft 201.

[0033] A fan frame 202 is installed above the movable shell 203, and a plurality of arc-shaped magnet sheets 204 are fixedly installed on the inner wall of the bottom end of the movable shell 203. The fan frame 202 is fixedly connected to the output shaft 201. The surfaces of the movable shell 203 and the fixed shell 301 are provided with a plurality of hollow holes, so that the entire motor can be continuously ventilated through the hollow holes during the rotation of the fan frame 202.

[0034] See also Figures 6 to 8The circulating lubrication mechanism 4 includes a sealing cover 401, which is fixedly connected to the fixed shell 301. A lubrication storage bin 403 is provided between the sealing cover 401 and the fixed shell 301. A filtering hollow ring 404 and a centrifugal push frame 402 are installed on the inner side of the lubrication storage bin 403. An annular filter element 405 is installed on the inner side of the filtering hollow ring 404. The filtering hollow ring 404 is threadedly connected to the sealing cover 401. The annular filter element 405 is inserted between the filtering hollow ring 404 and the sealing cover 401. A retention groove 406 is provided on the inner side of the annular filter element 405. A plurality of guide holes 407 are provided on the upper and lower end surfaces of the filtering hollow ring 404, so that the lubricating grease contacts the annular filter element 405 after being guided by the guide holes 407, so that the annular filter element 405 automatically filters the lubricating grease and retains impurities through the retention groove 406 to keep the lubricating grease clean.

[0035] In summary, the first protective cover 101 and the second protective cover 102 are fitted and fixed on the outer sides of the outer rotor mechanism 2, the inner stator mechanism 3 and the two circulating lubrication mechanisms 4. Specifically, the upper and lower ends of the second protective cover 102 are respectively fixedly connected to the first protective cover 101 and the fixed shell 301, so that the first protective cover 101 and the second protective cover 102 can seal and protect the whole, effectively preventing the entry of external dust and rainwater during the operation of the drone from interfering with the electrical components;

[0036] The fixed shell 301 is fixedly connected to the UAV, and the upper end of the output shaft 201 is fixedly connected to the rotor of the UAV. The coil winding 303 includes a silicon steel sheet group and an enameled wire, and the enameled wire is wound on the silicon steel sheet group. When the power is turned on, the multiple arc-shaped magnet sheets 204 interact with the coil winding 303, and the multiple arc-shaped magnet sheets 204 drive the fan frame 202 and the output shaft 201 to rotate synchronously through the movable shell 203. The output of the output shaft 201 can be kept stable through two connecting bearings 302. A plurality of hollow holes are provided on the surfaces of the movable shell 203 and the fixed shell 301, so that the motor as a whole can be continuously ventilated through the hollow holes during the rotation of the fan frame 202.

[0037] At the same time, a heat conduction module is installed on the inner side of the bottom end of the second protective cover 102, and the heat conduction module is composed of a first heat conduction ring 103, a second heat conduction ring 104, an annular heat conduction fin 105 and a transmission tube 106. The first heat conduction ring 103, the second heat conduction ring 104 and the two transmission tubes 106 are filled with heat conduction liquid. When the fan frame 202 is ventilated, the heat generated by the internal operation of the motor can be continuously output through the multiple annular heat conduction fins 105, effectively improving the heat dissipation effect;

[0038] Lubrication storage bins 403 are provided between the upper and lower ends of the fixed shell 301 and the two sealing covers 401, and the two lubrication storage bins 403 are connected through a plurality of guide grooves 205. The inner side of the lubrication storage bins 403 is filled with lubricating grease, so that when the output shaft 201 drives the centrifugal push frame 402 to rotate, the centrifugal push frame 402 can push the lubricating grease to flow through the guide grooves 205, and then can continuously lubricate and replenish the two connecting bearings 302 to maintain the lubrication stability of the connecting bearings 302. Guide holes 407 are provided on the upper and lower end surfaces of the filtering hollow ring 404, so that the lubricating grease contacts the annular filter element 405 after being guided through the guide holes 407, thereby realizing automatic filtering of the lubricating grease by the annular filter element 405 and retaining impurities through the retention grooves 406 to keep the lubricating grease clean.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A brushless motor for an unmanned aerial vehicle, comprising a protective isolation mechanism (1), an outer rotor mechanism (2) and a circulating lubrication mechanism (4), characterized in that: An outer rotor mechanism (2) is installed on the inner side of the protective isolation mechanism (1), an inner stator mechanism (3) is installed on the inner side of the bottom end of the outer rotor mechanism (2), and a circulating lubrication mechanism (4) is installed on both the upper and lower ends of the inner stator mechanism (3). The protective isolation mechanism (1) comprises a second protective cover (102), and a first protective cover (101) is fixedly installed on the upper end of the second protective cover (102). The inner stator mechanism (3) comprises a fixed shell (301), and the fixed shell (301) is fixedly connected to the second protective cover (102). Connecting bearings (302) are fixedly installed on the inner sides of both the upper and lower ends of the fixed shell (301), and a coil winding (303) is fixedly installed on the outer side of the upper end of the fixed shell (301). A plurality of arc-shaped guide seats (304) are fixedly provided on the side of the fixed shell (301); The circulating lubrication mechanism (4) comprises a sealing cover (401), the sealing cover (401) being fixedly connected to the fixed shell (301), a lubrication storage bin (403) being provided between the sealing cover (401) and the fixed shell (301), a filtering hollow ring (404) and a centrifugal push frame (402) being installed on the inner side of the lubrication storage bin (403), an annular filter element (405) being installed on the inner side of the filtering hollow ring (404), a retention groove (406) being provided on the inner side of the annular filter element (405), and a plurality of guide holes (407) being provided on both upper and lower end surfaces of the filtering hollow ring (404); The protective isolation mechanism (1) also includes a heat conduction module connected to the inner side of the bottom end of the second protective cover (102), the heat conduction module including a first heat conduction ring (103), a second heat conduction ring (104) is installed above the first heat conduction ring (103), two transmission tubes (106) are arranged between the first heat conduction ring (103) and the second heat conduction ring (104), and a plurality of annular heat conduction fins (105) are arranged on the lower end surface of the first heat conduction ring (103) and the upper end surface of the second heat conduction ring (104), and the sizes of the plurality of annular heat conduction fins (105) increase from the inside to the outside; The outer rotor mechanism (2) comprises an output shaft (201), the output shaft (201) is plugged into the inner sides of two connecting bearings (302), a plurality of guide grooves (205) are provided on the outer side of the middle part of the output shaft (201), a movable shell (203) is fixedly mounted on the outer side of the upper end of the output shaft (201), a fan frame (202) is mounted above the movable shell (203), and a plurality of arc-shaped magnet sheets (204) are fixedly mounted on the inner wall of the bottom end of the movable shell (203); The bottom ends of the two transmission tubes (106) pass through the fixed shell (301) and the second protective cover (102) and are fixedly connected to the first heat-conducting sleeve (103); the interiors of the first heat-conducting sleeve (103) and the second heat-conducting sleeve (104) are connected through the two transmission tubes (106); the interiors of the first heat-conducting sleeve (103), the second heat-conducting sleeve (104) and the transmission tubes (106) are filled with heat-conducting liquid.

2. The brushless motor for drone according to claim 1, characterized in that: The coil winding (303) comprises a silicon steel sheet group, wherein the silicon steel sheet group is formed by stacking a plurality of silicon steel sheets in sequence from bottom to top, and a plurality of enameled wires are wound around the outer side of the silicon steel sheet group.

3. The brushless motor for drone according to claim 2, characterized in that: An annular slide groove is provided at the bottom end of the movable shell (203), and the upper ends of the plurality of arc-shaped guide seats (304) are plugged into the inner side of the annular slide groove. The movable shell (203) rotates relative to the axis of the fixed shell (301), and the fan frame (202) is fixedly connected to the output shaft (201).

4. The brushless motor for drone according to claim 3, characterized in that: The surfaces of the movable shell (203) and the fixed shell (301) are both provided with a plurality of hollow holes, and the fixed shell (301) is rotatably connected to the output shaft (201) via two connecting bearings (302).

5. The brushless motor for drone according to claim 4, characterized in that: The two lubrication storage bins (403) are connected through a plurality of guide grooves (205), and the inner sides of the lubrication storage bins (403) and the guide grooves (205) are filled with lubrication grease.

6. The brushless motor for drone according to claim 5, characterized in that: A sealing ring is provided between the sealing cover (401) and the output shaft (201), the centrifugal push frame (402) is fixedly connected to the output shaft (201), the filtering hollow ring (404) is threadedly connected to the sealing cover (401), and the annular filter element (405) is plugged between the filtering hollow ring (404) and the sealing cover (401).

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