Brushless motor for unmanned aerial vehicle

Abstract

The utility model relates to a brushless motor for an unmanned aerial vehicle, the brushless motor comprises a stator frame body, winding groups, a rotor frame body, permanent magnets, an annular plate and a rotating shaft, the winding groups are installed on the stator frame body, the rotating shaft is connected to the stator frame body through a bearing, the rotor frame body is connected to the rotating shaft, and the permanent magnets are installed on the rotor frame body. The annular plate is detachably connected to the rotor frame body, the two permanent magnets are embedded in the inner annular wall of the rotor frame body, a plurality of heat dissipation grooves are formed in the rotor frame body, a stable frame is arranged at the position, corresponding to the edges of the heat dissipation grooves, of the top wall of the rotor frame body, and the stable frame is fixed to the rotor frame body from the periphery of the rotor frame body to the rotating shaft in the reference direction. The height of the stable frame is gradually increased. The brushless motor has the effect of prolonging the service life of the brushless motor.

Description

Technical Field

[0001] This application relates to the field of brushless motor technology, and in particular to a brushless motor for use in drones. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. Because a brushless DC motor operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor that starts under heavy load with frequency conversion speed regulation, nor does it experience oscillation or loss of synchronism during sudden load changes.

[0003] Chinese patent CN218041014U discloses a brushless motor structure, which includes a motor bracket, a bearing assembly, a stator assembly, a circular magnet, and a shaft core. The motor bracket has a mounting portion, the bearing assembly is at least partially disposed within the mounting portion, the stator assembly is sleeved outside the mounting portion, the circular magnet is sleeved within the stator assembly, and the shaft core is connected to the center of the circular magnet, with one end of the shaft core connected within the bearing assembly. This structure is simple and helps reduce product costs.

[0004] Regarding the aforementioned technologies, in the existing technology, the circular magnet and the motor bracket form a closed structure, with only a ventilation slot on the motor bracket. During long-term operation of the motor, heat is generated inside the motor, especially in the field of drones. In actual use, the motor will be under high load for a long time, generating a lot of heat. Relying on only one slot for heat dissipation cannot meet the cooling requirements of the internal components of the motor in a short time, causing the internal components of the motor to age faster and affecting the service life of the motor. Summary of the Invention

[0005] In order to extend the service life of brushless motors, this application provides a brushless motor for drones.

[0006] This application provides a technical solution for a brushless motor used in drones, which adopts the following approach:

[0007] A brushless motor for drones includes a stator frame, a winding assembly, a rotor frame, permanent magnets, a ring plate, and a shaft. Several winding assemblies are mounted on the stator frame. The shaft is connected to the stator frame via bearings. The rotor frame is connected to the shaft. The ring plate is detachably connected to the rotor frame. Two permanent magnets are embedded in the inner ring wall of the rotor frame. Several heat dissipation slots are formed on the rotor frame. A stabilizing frame is provided on the top wall of the rotor frame at positions corresponding to the edges of the heat dissipation slots. The height of the stabilizing frame gradually increases from the periphery of the rotor frame to the shaft, with a reference direction.

[0008] By adopting the above technical solution and setting up several heat dissipation slots, an air convection space is formed at the bottom and top of the brushless motor. This allows external air to continuously dissipate heat from the winding assembly inside the motor during drone flight, enabling the internal components of the brushless motor to operate for extended periods. This reduces the likelihood of component aging, decreases the possibility of motor failure, and extends the lifespan of the brushless motor. Simultaneously, a sturdy frame is installed to strengthen the rotor frame structure, reducing the possibility of deformation under stress during high-speed rotation and further improving the rotor frame's lifespan.

[0009] Optionally, a weight-reducing groove is provided on the top of the rotor frame at a position corresponding to the position between two adjacent stabilizing frames.

[0010] By adopting the above technical solution, the weight reduction groove is used to further reduce the weight of the rotor frame, making it easier for the drone to take off when the propeller rotates.

[0011] Optionally, a locking nut is threaded onto the top of the shaft, and an installation space for mounting the propeller is provided between the top of the rotor frame and the locking nut. The propeller is located between the locking nut and the stabilizing frame.

[0012] By adopting the above technical solution, when installing the propeller, the propeller is fitted onto the rotating shaft, and then the locking nut is rotated to confine the propeller frame between the locking nut and the stable frame. The installation steps are simple and quick, improving the convenience of propeller frame installation.

[0013] Optionally, the highest point of the sturdy frame is provided with several flanges, and the spiral frame abuts against the flanges.

[0014] By adopting the above technical solution and setting several flanges, the friction between the propeller and the rotor frame is increased, reducing the possibility of propeller slippage when the rotor frame rotates.

[0015] Optionally, a connecting assembly is provided between the annular plate and the rotor frame. The connecting assembly includes an extension block and a snap-fit ​​claw. One end of the extension block is connected to the annular plate, and the snap-fit ​​claw is connected to the other end of the extension block. The rotor frame is provided with an annular step and an insertion groove. The insertion groove is provided with a snap-fit ​​groove. The annular plate fits against the annular step, the extension block enters the insertion groove, and the snap-fit ​​claw engages with the snap-fit ​​groove. A clamping member is provided on the rotor frame at a position corresponding to the snap-fit ​​groove to restrict the movement of the snap-fit ​​claw.

[0016] By adopting the above technical solution, when installing the ring plate, the ring plate is fitted to the annular step, and the extension block enters the insertion groove. During this process, the locking claw abuts against the edge of the locking groove, and the locking groove deforms until the locking claw passes through the locking groove. The locking claw then returns to its original position and engages with the locking groove, thereby restricting the degree of freedom of the ring plate and realizing the installation of the ring plate.

[0017] Optionally, the abutting member is a abutting plate, and a receiving groove is opened on the rotor frame at the position corresponding to the snap-fit ​​groove. One end of the abutting member is integrally formed on one end of the receiving groove. When engaged, the other end of the abutting member deforms and presses against the snap-fit ​​claw.

[0018] By adopting the above technical solution, during the high-speed rotation of the rotor frame, the ring plate is subjected to vibration, which poses a risk of the locking claw disengaging from the locking groove. When the locking claw engages with the locking groove, the locking claw pushes the other end of the clamping member to deform until the locking claw engages with the locking groove. At this time, the other end of the clamping member applies pressure to the locking claw through deformation, reducing the possibility of the locking claw moving due to vibration.

[0019] Optionally, the rotor frame is provided with a plurality of connecting arc plates, which are evenly distributed around the axis of the rotor frame.

[0020] By adopting the above technical solution, the connecting arc plate is used to separate the magnetic field generated by each winding group, so that the magnetic field of each winding group is evenly separated and does not affect each other, allowing the permanent magnet to rotate better and reducing the interference encountered when the permanent magnet moves.

[0021] Optionally, a shim ring is connected to the rotor frame, and a shim is fitted on the rotating shaft, with the shim located between the upper bearing and the shim ring.

[0022] By adopting the above technical solution, the shim ring is used to assist in supporting the rotor frame. By setting the shim plate, the friction between the rotor frame and the bearing is reduced, making the rotor frame more stable.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By incorporating several heat dissipation slots, air convection spaces are created at the bottom and top of the brushless motor. This allows external air to continuously dissipate heat from the winding assembly inside the motor during drone flight, enabling the internal components of the brushless motor to operate for extended periods. This reduces the likelihood of component aging and motor failure, thus extending the motor's lifespan. Simultaneously, a sturdy frame is installed to strengthen the rotor frame structure, reducing the possibility of deformation under stress during high-speed rotation and further improving the rotor frame's lifespan.

[0025] 2. When installing the ring plate, the ring plate is aligned with the annular step, and the extension block is inserted into the groove. During this process, the locking claws abut against the edge of the locking groove, and the locking groove deforms until the locking claws pass through the locking groove. The locking claws then return to their original position and engage with the locking groove, thereby restricting the degree of freedom of the ring plate and realizing the installation of the ring plate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the brushless motor in the embodiments of this application.

[0027] Figure 2 This is an exploded view used in the embodiments of this application to illustrate the structure of the brushless motor.

[0028] Figure 3 This is a schematic diagram of the rotor frame structure in an embodiment of this application.

[0029] Figure 4 This is a cross-sectional view used in the embodiments of this application to illustrate the structure of the brushless motor.

[0030] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Stator frame; 2. Winding assembly; 3. Rotor frame; 31. Heat dissipation groove; 32. Stabilizing frame; 33. Weight reduction groove; 34. Elevation ring; 35. Flange; 36. Connecting arc plate; 37. Annular step; 38. Insertion groove; 39. Snap-fit ​​groove; 4. Permanent magnet; 5. Ring plate; 6. Shaft; 61. Pad; 62. Locking nut; 7. Connecting assembly; 71. Extension block; 72. Snap-fit ​​claw; 8. Clamping element. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0033] This application discloses a brushless motor for use in drones. (Refer to...) Figure 1 and Figure 2 The brushless motor used in drones includes a stator frame 1, a winding assembly 2, a rotor frame 3, a permanent magnet 4, a ring plate 5, and a rotating shaft 6. The rotating shaft 6 is rotatably connected to the stator frame 1 via bearings. Several winding assemblies 2 are installed on the stator frame 1; this embodiment uses six winding assemblies as an example.

[0034] Reference Figure 3 and Figure 4The rotor frame 3 is mounted on the rotating shaft 6. Several heat dissipation slots 31 are formed on the top of the rotor frame 3; in this embodiment, five slots are used as an example, and the five slots 31 are evenly distributed around the circumference of the rotating shaft 6. A stabilizing frame 32 is integrally formed at the edge of the rotor frame 3 corresponding to the heat dissipation slots 31. The height of the stabilizing frame 32 gradually increases from the periphery of the rotor frame 3 to the rotating shaft 6. A weight-reducing groove 33 is formed at the top of the rotor frame 3 between two adjacent heat dissipation slots 31. A shim 34 is integrally formed on the rotor frame 3 at the position corresponding to the stator frame 1. A shim 61 is mounted on the rotating shaft 6, located between the upper bearing and the shim 34.

[0035] The stabilizing frame 32 is used to increase the structural strength of the rotor frame 3. The inclined stabilizing frame 32 serves to reduce the weight of the rotor frame 3 and to avoid obstructing the screw frame. The weight-reducing groove 33 is used to reduce the weight of the rotor frame 3. The shim ring 34 is used to assist in supporting the rotor frame 3, improving the stability of the middle part of the rotor frame 3 during rotation.

[0036] Reference Figure 1 and Figure 3 The top of the rotating shaft 6 is threaded with a locking nut 62. The installation space between the locking nut 62 and the stabilizing frame 32 is used to install the propeller. The top of the stabilizing frame 32 is provided with several flanges 35, which are used to increase the friction between the propeller and the stabilizing frame 32.

[0037] Reference Figure 2 and Figure 3 To facilitate better rotation of the rotor frame 3, several connecting arc plates 36 are fixedly connected to the bottom wall of the rotor frame 3. These connecting arc plates 36 are evenly distributed circumferentially around the axis of the rotor frame 3. The connecting arc plates 36 are used to separate the magnetic field generated by each winding group 2.

[0038] Reference Figure 2 , Figure 4 and Figure 5 An annular plate 5 is positioned below the rotor frame 3. The rotor frame 3 has several connecting components 7; in this embodiment, five sets are used as an example. Each connecting component 7 includes an extension block 71 and a locking claw 72. An annular step 37 is formed on the bottom wall of the rotor frame 3. The annular plate 5 fits against the annular step 37. One end of the extension block 71 is fixedly connected to the annular plate 5, and the locking claw 72 is fixedly connected to the other end of the extension block 71. An insertion groove 38 is formed on the rotor frame 3 at the position corresponding to the extension block 71. A locking groove 39 is formed within the insertion groove 38. The extension block 71 enters the insertion groove 38, and the locking claw 72 engages with the locking groove 39.

[0039] Reference Figure 3 and Figure 5The rotor frame 3 has a receiving groove at the position corresponding to the snap-fit ​​groove 39. A clamping member 8 is provided in the receiving groove. The clamping member 8 is a clamping plate. One end of the clamping member 8 is integrally formed at the end of the receiving groove, and the other end of the clamping member 8 is deformed and presses against the snap-fit ​​claw 72. Two permanent magnets 4 are embedded in the ring plate 5 and are arranged opposite each other.

[0040] When installing the ring plate 5, the extension block 71 is placed into the receiving groove, and the locking claw 72 abuts against the edge of the locking groove 39. The locking claw 72 deforms until it passes through the locking groove 39, and then the locking claw 72 returns to its original position and engages with the locking groove 39. During this process, the locking claw 72 abuts against the other end of the clamping member 8, causing the clamping member 8 to deform. The other end of the clamping frame applies pressure to the locking claw 72.

[0041] The implementation principle of a brushless motor for a drone according to an embodiment of this application is as follows: During installation, a pad 61 is placed on the rotating shaft 6, with the pad 61 abutting against the upper bearing. Then, the rotor frame 3 is placed on the rotating shaft 6, so that the shim ring 34 abuts against the pad 61. The ring plate 5 is aligned with the annular step 37, the extension block 71 is inserted into the insertion groove 38, and the locking claw 72 engages with the locking groove 39. The other end of the clamping member 8 presses against the locking claw 72. Then, the spiral frame is placed on the rotating shaft 6, and the locking nut 62 is rotated to tighten the spiral frame, thus realizing the installation of the brushless motor.

[0042] By incorporating several heat dissipation slots 31, an air convection space is created between the bottom and top of the brushless motor. This allows external air to continuously dissipate heat from the winding assembly 2 inside the motor during drone flight, enabling the internal components of the brushless motor to operate for extended periods. This reduces the likelihood of component aging, decreases the possibility of motor failure, and extends the motor's lifespan. Simultaneously, a sturdy frame 32 is provided to strengthen the rotor frame 3's structure, reducing the possibility of deformation under stress during high-speed rotation and further improving its lifespan.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A brushless motor for a drone, comprising a stator frame (1), a winding assembly (2), a rotor frame (3), a permanent magnet (4), a ring plate (5), and a rotating shaft (6), wherein several winding assemblies (2) are mounted on the stator frame (1), the rotating shaft (6) is connected to the stator frame (1) via bearings, and the rotor frame (3) is connected to the rotating shaft (6), characterized in that: The ring plate (5) is detachably connected to the rotor frame (3). Two permanent magnets (4) are embedded in the inner ring wall of the rotor frame (3). The rotor frame (3) has several heat dissipation slots (31). A stabilizing frame (32) is provided on the top wall of the rotor frame (3) at the position corresponding to the edge of the heat dissipation slot (31). The height of the stabilizing frame (32) gradually increases from the periphery of the rotor frame (3) to the rotating shaft (6) as the reference direction.

2. The brushless motor for a drone according to claim 1, characterized in that: The rotor frame (3) has a weight-reducing groove (33) at the top corresponding to the position between the two adjacent stabilizing frames (32).

3. The brushless motor for drones according to claim 1, characterized in that: The top of the rotating shaft (6) is threaded with a locking nut (62), and an installation space for mounting the propeller is provided between the top of the rotor frame (3) and the locking nut (62). The propeller is located between the locking nut (62) and the stabilizing frame (32).

4. The brushless motor for a drone according to claim 3, characterized in that: The highest point of the stable frame (32) is provided with several flanges (35), and the spiral frame abuts against the flanges (35).

5. The brushless motor for a drone according to claim 1, characterized in that: A connecting assembly (7) is provided between the ring plate (5) and the rotor frame (3). The connecting assembly (7) includes an extension block (71) and a snap-fit ​​claw (72). One end of the extension block (71) is connected to the ring plate (5), and the snap-fit ​​claw (72) is connected to the other end of the extension block (71). An annular step (37) is provided on the rotor frame (3). An insertion groove (38) is provided on the rotor frame (3). A snap-fit ​​groove (39) is provided on the insertion groove (38). The ring plate (5) fits against the annular step (37). The extension block (71) enters the insertion groove (38). The snap-fit ​​claw (72) snaps into the snap-fit ​​groove (39). A clamping member (8) is provided on the rotor frame (3) at a position corresponding to the snap-fit ​​groove (39) to restrict the movement of the snap-fit ​​claw (72).

6. The brushless motor for a drone according to claim 5, characterized in that: The clamping member (8) is a clamping plate. The rotor frame (3) has a receiving groove at the position corresponding to the snap-fit ​​groove (39). One end of the clamping member (8) is integrally formed at one end of the receiving groove. When they are engaged, the other end of the clamping member (8) deforms and presses against the snap-fit ​​claw (72).

7. The brushless motor for a drone according to claim 1, characterized in that: The rotor frame (3) is provided with a plurality of connecting arc plates (36), which are evenly distributed around the axis of the rotor frame (3).

8. The brushless motor for a drone according to claim 1, characterized in that: A shim ring (34) is connected to the rotor frame (3), and a pad (61) is fitted on the rotating shaft (6). The pad (61) is located between the upper bearing and the shim ring (34).

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