A coaxial structure of dual-motor for unmanned aerial vehicle blade

Abstract

The utility model relates to motor coaxial technical field especially, it relates to a kind of unmanned aerial vehicle paddle double-motor coaxial structure, by third screw thread installation to the inside of second screw hole and third screw hole, it can be fixed between lower stator and steel axle, by second screw through the abutment inside of tooth hole and blind hole, it can be fixed between upper stator and steel axle, it can prevent the movement of upper stator and lower stator in radial and axial direction;By fourth screw through the abutment of through hole and fourth screw hole thread connection and lock axle washer fixed, it can be abutted and fixed to upper rotor, and upper stator tail end can be abutted and fixed with the bearing inside lower rotor;So it can realize the independent installation between lower rotor and upper rotor, so that lower rotor and upper rotor are independent of each other, so that rotation is different from the past rely on single steel axle drive two groups of paddle, the airflow generated in the flight process of upper and lower paddle can avoid mutual interference between lower rotor and upper rotor, so as to relieve motor vibration.

Description

Technical Field

[0001] This utility model relates to the field of coaxial motor technology, and in particular to a coaxial structure for dual motors on a drone propeller. Background Technology

[0002] Coaxial dual-motor power units are commonly found in medium to large multi-rotor UAVs and lightweight EVTOLs. Based on the coaxial dual-motor power unit, they employ a distributed lift layout. This type of dual-motor power unit has a simple structure; during operation, the two motors rotate in opposite directions. Lift and yaw are controlled by separately controlling the speed of each motor on each power unit. Variable pitch technology is commonly found in the rotor control mechanisms of traditional helicopters. It indirectly controls the rotor pitch by changing the swashplate angle, thereby altering the helicopter's yaw.

[0003] Currently, the dual-motor coaxial structure has the problem of mutual interference and increased motor vibration when the upper and lower rotors are coaxial and flying with propellers, due to the single main shaft driving the two rotors to rotate. There are also problems with the difficulty of wiring during motor installation, which leads to an increase in the size of the structure and the weight of the motor.

[0004] This patent addresses the issue of two rotors being independent of each other by fixing the motor spindle, thus resolving the interference caused by the upper and lower propellers during flight and mitigating vibration. The structural optimization eliminates the need for wiring between the two motors, ensuring structural compactness and reducing overall motor weight. Therefore, we propose a coaxial dual-motor structure for UAV propellers to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a coaxial structure for dual motors on a drone propeller.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a coaxial structure of dual motors for a drone propeller, comprising a lower rotor, an inner cavity, an upper rotor, a bearing, a first screw hole, a propeller clamp, a through hole, a first screw, a groove, a first through hole, a propeller blade, a boss, a second through hole, a bolt, a lower stator, a second screw hole, a first inner hole, an upper stator, a second inner hole, a threaded hole, a first wire hole, a second screw, a steel shaft, a third screw hole, a third screw, a fourth screw hole, a blind hole, a second wire hole, a locking washer, a through hole, and a fourth screw. The lower rotor and the upper rotor... Each rotor has an inner cavity in its center, and bearings are movably mounted at the top and bottom of the inner cavity. Multiple first screw holes are provided on the surfaces of both the lower and upper rotors, and propeller clamps are movably mounted on the surfaces of both rotors. Multiple through holes are provided on the surfaces of the propeller clamps, and the first screws pass through these through holes and are threaded into the first screw holes. Grooves are provided on both sides of each propeller clamp, and first through holes are provided at the top and bottom of each groove. Propellers are movably mounted on both sides of each propeller clamp, and a boss is fixedly mounted at the tail end of each propeller blade, with the boss movably mounted inside the groove. The boss surface has a second through hole. The bolt passes through the first and second through holes in sequence and the nut is tightened to lock and fix the blade. A lower stator is adapted to be installed inside the lower rotor. The surface of the lower stator has multiple second screw holes. The lower stator has a first inner hole in the middle. An upper stator is adapted to be installed inside the upper rotor. The upper stator has a second inner hole in the middle. The surface of the upper stator has multiple threaded holes. The surface of the upper stator has a first wire guide hole. The steel shaft passes through the middle of the lower rotor and the upper rotor in sequence. In the combined installation, one end of the steel shaft is provided with multiple third screw holes, and the third screws are threaded into the second screw holes and the third screw holes. The other end of the steel shaft is provided with multiple fourth screw holes. The middle part of the surface of the steel shaft is provided with multiple blind holes. The second screw passes through the thread hole and abuts against the inside of the blind hole. The middle part of the surface of the steel shaft is provided with a second wire hole. A locking shaft washer is movably installed inside the middle cavity of the upper rotor. The surface of the locking shaft washer is provided with multiple through holes. The fourth screw passes through the through holes and is threaded into the fourth screw holes.

[0007] Furthermore, the first wire hole and the second wire hole are connected and correspond to each other.

[0008] Furthermore, the steel shaft is adapted to be connected to both the first inner hole in the middle of the lower stator and the second inner hole in the middle of the upper stator.

[0009] Furthermore, the steel shaft and the bearing inner hole are both fitted together.

[0010] Furthermore, the lower rotor and the upper rotor are arranged in a symmetrical structure on the steel shaft.

[0011] Compared with the prior art, this utility model has the following advantages: (1) The lower stator and the steel shaft can be fixed by the third screw threaded into the second screw hole and the third screw hole, which can prevent the lower stator from moving radially and axially; the upper stator and the steel shaft can be fixed by the second screw passing through the threaded hole and abutting inside the blind hole, which can prevent the upper stator from moving radially and axially; the locking shaft washer can be fixed by the fourth screw passing through the through hole and threaded into the fourth screw hole, which can abut and fix the upper rotor, and the tail end of the upper stator can abut and fix the bearing inside the lower rotor; thus, the lower rotor and the upper rotor can be installed independently, so that the lower rotor and the upper rotor are independent of each other, and the rotation is different from the previous reliance on a single steel shaft to drive two sets of blades, which can avoid the airflow generated by the upper and lower blades during flight from causing mutual interference between the lower rotor and the upper rotor, thereby alleviating motor vibration and solving the problem of mutual interference and increased motor vibration when the upper and lower rotors are coaxial and fly with blades.

[0012] (2) By passing through the first wire hole and the second wire hole, the three-phase wires of the upper stator can be used through the first wire hole and the second wire hole, and the three-phase wires of the lower stator can be directly out from the root. This reduces the inner diameter of the steel shaft, thereby reducing the overall motor structure and the weight of the motor. This solves the problem of difficulty in wire threading during motor installation, which leads to increased structure and motor weight. Attached Figure Description

[0013] Figure 1 This is a front view of the entire utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a cross-sectional view of the overall structure of this utility model; Figure 4 This is a schematic diagram of the overall disassembled structure of this utility model; Figure 5 This is a schematic diagram of the overall upper stator structure of this utility model; Figure 6 This is a schematic diagram of the overall steel shaft structure of this utility model; Figure 7 It is the whole of this utility model Figure 5 Schematic diagram of cross-section structure; Figure 8 It is the whole of this utility model Figure 6 Schematic diagram of cross-section structure.

[0014] In the diagram: 1. Lower rotor; 101. Inner cavity; 2. Upper rotor; 201. Bearing; 3. First screw hole; 4. Paddle clamp; 5. Through hole; 6. First screw; 7. Groove; 8. First through hole; 9. Paddle blade; 10. Boss; 11. Second through hole; 12. Bolt; 13. Lower stator; 14. Second screw hole; 15. First inner hole; 16. Upper stator; 17. Second inner hole; 18. Threaded hole; 19. First wire hole; 20. Second screw; 21. Steel shaft; 22. Third screw hole; 23. Third screw; 24. Fourth screw hole; 25. Blind hole; 26. Second wire hole; 27. Locking washer; 28. Through hole; 29. ​​Fourth screw. Detailed Implementation

[0015] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0016] like Figure 1-8The diagram shows a coaxial structure of a dual-motor rotor for a UAV, including a lower rotor 1, an inner cavity 101, an upper rotor 2, a bearing 201, a first screw hole 3, a rotor clamp 4, a through hole 5, a first screw 6, a groove 7, a first through hole 8, a rotor blade 9, a boss 10, a second through hole 11, a bolt 12, a lower stator 13, a second screw hole 14, a first inner hole 15, an upper stator 16, a second inner hole 17, a threaded hole 18, a first wire guide hole 19, a second screw 20, a steel shaft 21, a third screw hole 22, a third screw 23, a fourth screw hole 24, a blind hole 25, a second wire guide hole 26, a shaft locking washer 27, and a through hole 28. 8. The fourth screw 29, the lower rotor 1 and the upper rotor 2 are both provided with an inner cavity 101 in the middle, and bearings 201 are movably installed in the upper and lower parts of the inner cavity 101. The surfaces of the lower rotor 1 and the upper rotor 2 are provided with multiple first screw holes 3. The surfaces of the lower rotor 1 and the upper rotor 2 are both movably installed with a paddle clamp 4. The surface of the paddle clamp 4 is provided with multiple through holes 5. The first screw 6 passes through the through holes 5 and is threaded into the first screw hole 3. The sides of the paddle clamp 4 are provided with grooves 7. The grooves 7 are provided with first through holes 8 at the top and bottom. The sides of the paddle clamp 4 are movably installed with blades 9. The tail ends of the blades 9 are fixedly installed with bosses 10, and the bosses 10 are movably installed. Inside the groove 7, the surface of the boss 10 is provided with a second through hole 11. The bolt 12 passes through the first through hole 8 and the second through hole 11 in sequence, and the nut is tightened to lock and fix the blade 9. The lower rotor 1 is fitted with a lower stator 13. The surface of the lower stator 13 is provided with multiple second screw holes 14. The lower stator 13 has a first inner hole 15 in the middle. The upper rotor 2 is fitted with an upper stator 16. The upper stator 16 has a second inner hole 17 in the middle. The surface of the upper stator 16 is provided with multiple threaded holes 18. The surface of the upper stator 16 is provided with a first wire passage hole 19. The steel shaft 21 passes through the middle of the lower rotor 1 and the upper rotor 2 in sequence. For assembly, one end of the steel shaft 21 is provided with multiple third screw holes 22, and the third screw 23 is threaded into the second screw hole 14 and the third screw hole 22. The other end of the steel shaft 21 is provided with multiple fourth screw holes 24. The middle part of the surface of the steel shaft 21 is provided with multiple blind holes 25. The second screw 20 passes through the thread hole 18 and abuts against the inside of the blind hole 25. The middle part of the surface of the steel shaft 21 is provided with a second wire hole 26. The inner cavity 101 in the middle of the upper rotor 2 is movably installed with a locking shaft washer 27. The surface of the locking shaft washer 27 is provided with multiple through holes 28. The fourth screw 29 passes through the through hole 28 and is threaded into the fourth screw hole 24.

[0017] In this embodiment, the first wire-passing hole 19 and the second wire-passing hole 26 are aligned and pass through each other, allowing the three-phase wires of the upper stator 16 to pass through and be used. Furthermore, the three-phase wires of the lower stator 13 can exit directly from the root. This reduces the inner diameter of the steel shaft 21, achieving the goal of reducing the overall motor structure and weight. This solves the problem of difficulty in wire threading during motor installation, which leads to increased structural size and motor weight. In this embodiment, the steel shaft 21 is adapted to be connected to both the first inner hole 15 in the middle of the lower stator 13 and the second inner hole 17 in the middle of the upper stator 16, thereby ensuring the concentricity of the lower stator 13 and the upper stator 16.

[0018] In this embodiment, the steel shaft 21 and the inner hole of the bearing 201 are adapted to be connected, thereby ensuring the concentricity of the lower rotor 1 and the upper rotor 2.

[0019] In this embodiment, the lower rotor 1 and the upper rotor 2 are arranged in a downwardly symmetrical structure on the steel shaft 21. The third screw 23, threaded into the second screw hole 14 and the third screw hole 22, secures the lower stator 13 to the steel shaft 21, preventing radial and axial movement of the lower stator 13. The second screw 20, passing through the threaded hole 18 and abutting against the blind hole 25, secures the upper stator 16 to the steel shaft 21, preventing radial and axial movement of the upper stator 16. The fourth screw 29, threaded through the through hole 28 and into the fourth screw hole 24, secures the locking washer 27, allowing the upper rotor 2... The upper stator 16 is fixed in place by abutting, and the tail end of the upper stator 16 is fixed in abutting with the bearing 201 inside the lower rotor 13. This allows the lower rotor 1 and the upper rotor 2 to be installed independently, making their rotation different from the previous method of driving two sets of blades 9 with a single steel shaft 21. This avoids the airflow generated by the upper and lower blades 9 during flight from interfering with each other between the lower rotor 1 and the upper rotor 2, thereby reducing motor vibration and solving the problem of mutual interference and increased motor vibration when the upper and lower rotors are coaxial and fly with propellers.

[0020] The working principle of the coaxial dual-motor structure for drone propellers mentioned in this utility model is as follows: In use, the lower stator 13 is fixed to the steel shaft 21 by threading the third screw 23 into the second screw hole 14 and the third screw hole 22, preventing radial and axial movement of the lower stator 13. The upper stator 16 is fixed to the steel shaft 21 by abutting the second screw 20 through the threaded hole 18 and the blind hole 25, preventing radial and axial movement of the upper stator 16. The locking washer 27 is fixed by threading the fourth screw 29 through the through hole 28 and the fourth screw hole 24, which abuts and fixes the upper rotor 2, and the tail end of the upper stator 16 abuts and fixes the bearing 201 inside the lower rotor 13. Thus, the lower rotor 1 and the upper rotor 2 can be installed independently, making them independent of each other. This avoids the airflow generated by the upper and lower blades 9 during flight from interfering with each other, thereby reducing motor vibration and solving the problem of mutual interference and increased motor vibration when the upper and lower rotors are coaxial with the propeller during flight. Meanwhile, by passing through the first wire hole 19 and the second wire hole 26, the three-phase wires of the upper stator 16 can be passed through the first wire hole 19 and the second wire hole 26 for use, and the three-phase wires of the lower stator 13 can be directly exited from the root. This reduces the inner diameter of the steel shaft 21, thereby reducing the overall motor structure and weight, and solving the problem of difficulty in wire threading during motor installation, which leads to increased structure and motor weight. Meanwhile, the steel shaft 21 is adapted to be connected to the first inner hole 15 in the middle of the lower stator 13 and the second inner hole 17 in the middle of the upper stator 16, thereby ensuring the concentricity of the lower stator 13 and the upper stator 16. Meanwhile, the steel shaft 21 and the inner hole of the bearing 201 are adapted to each other, thus ensuring the concentricity of the lower rotor 1 and the upper rotor 2.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A coaxial structure for dual motors of a UAV propeller, comprising a lower rotor (1), an inner cavity (101), an upper rotor (2), a bearing (201), a first screw hole (3), a propeller clamp (4), a through hole (5), a first screw (6), a groove (7), a first through hole (8), a propeller blade (9), a boss (10), a second through hole (11), a bolt (12), a lower stator (13), a second screw hole (14), a first inner hole (15), an upper stator (16), a second inner hole (17), a threaded hole (18), a first wire hole (19), a second screw (20), a steel shaft (21), a third screw hole (22), a third screw (23), a fourth screw hole (24), a blind hole (25), a second wire hole (26), a locking washer (27), a through hole (28), and a fourth screw (29), characterized in that: Both the lower rotor (1) and the upper rotor (2) have an inner cavity (101) in the middle. Bearings (201) are movably installed in the upper and lower parts of the inner cavity (101). Both the lower rotor (1) and the upper rotor (2) have multiple first screw holes (3) on their surfaces. Both the lower rotor (1) and the upper rotor (2) have a movably installed paddle clamp (4) on their surfaces. Both the paddle clamp (4) have multiple through holes (5) on their surfaces. The first screw (6) passes through the through hole (5) and is threaded into the first screw hole (3). Both sides of the paddle clamp (4) have grooves (7). Both the upper and lower parts of the grooves (7) are provided with... The first through hole (8) has blades (9) movably mounted on both sides of the blade clamp (4). Each blade (9) has a fixed boss (10) at its tail end, and the boss (10) is movably mounted inside the groove (7). The surface of the boss (10) has a second through hole (11). The bolt (12) passes through the first through hole (8) and the second through hole (11) in sequence, and the nut is tightened to lock and fix the blade (9). The lower rotor (1) has a lower stator (13) fitted inside. The surface of the lower stator (13) has multiple second screw holes (14). Inside the lower stator (13)... The upper rotor (2) has a first inner hole (15), and an upper stator (16) is fitted inside the upper rotor (2). The upper stator (16) has a second inner hole (17) in the middle. The upper stator (16) has multiple threaded holes (18) on its surface and a first wire hole (19) on its surface. The steel shaft (21) passes through the middle of the lower rotor (1) and the upper rotor (2) in sequence for assembly. One end of the steel shaft (21) has multiple third screw holes (22), and the third screws (23) are threaded into the second screw holes (14) and the third screw holes (22). Inside, the other end of the steel shaft (21) is provided with a plurality of fourth screw holes (24), and the middle part of the surface of the steel shaft (21) is provided with a plurality of blind holes (25). The second screw (20) passes through the thread hole (18) and abuts against the inside of the blind hole (25). The middle part of the surface of the steel shaft (21) is provided with a second wire hole (26). The inner cavity (101) in the middle part of the upper rotor (2) is movably installed with a locking shaft washer (27). The surface of the locking shaft washer (27) is provided with a plurality of through holes (28). The fourth screw (29) passes through the through hole (28) and is threadedly connected to the fourth screw hole (24).

2. The coaxial structure of dual motors for UAV propellers according to claim 1, characterized in that: The first wire hole (19) and the second wire hole (26) are connected and correspond to each other.

3. The coaxial structure of dual motors for UAV propellers according to claim 1, characterized in that: The steel shaft (21) is adapted to be connected to the first inner hole (15) in the middle of the lower stator (13) and the second inner hole (17) in the middle of the upper stator (16).

4. The coaxial structure of dual motors for UAV propellers according to claim 1, characterized in that: The steel shaft (21) and the inner hole of the bearing (201) are both adapted to be connected.

5. The coaxial structure of dual motors for UAV propellers according to claim 1, characterized in that: The lower rotor (1) and the upper rotor (2) are arranged in a symmetrical structure on the steel shaft (21).

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