Lightweight unmanned aerial vehicle motor
By employing a hollow structure design and an aluminum rotor shaft in the drone motor, the problems of excessive weight and insufficient heat dissipation were solved, achieving both lightweight design and efficient heat dissipation.
Patent Information
- Application Number
- CN202520488424.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-19
AI Technical Summary
Existing drone motors are too heavy and have insufficient heat dissipation performance, making it difficult to meet the requirements for lightweight design.
The design employs a hollow structure, including a stator core and a rotor disc, with multiple hollow holes. Combined with an aluminum rotor shaft and support rods, it enhances structural strength and improves heat dissipation performance.
It achieves ultra-lightweight motor, reducing weight by 30%-50%, improving heat dissipation capacity by 70%, reducing temperature rise by 15℃, and exhibiting excellent mechanical strength and electromagnetic performance.
Smart Images
Figure CN223942505U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a lightweight UAV motor. Background Technology
[0002] A multi-rotor drone is a special type of unmanned helicopter with three or more rotor shafts. Each shaft is powered by an electric motor that drives the rotors, generating thrust. Unlike conventional helicopters, the collective pitch of the rotors is fixed. By changing the relative speeds between the different rotors, the thrust per shaft can be altered, thus controlling the aircraft's trajectory.
[0003] Currently, drones use a wide variety of motors. These traditional motors mostly employ solid metal structures, resulting in issues such as heavy material usage. Existing lightweight motors are generally achieved by reducing material usage, but this can easily lead to insufficient structural strength or reduced heat dissipation performance, making it difficult to meet the requirements of lightweight applications. Utility Model Content
[0004] The purpose of this invention is to provide a lightweight drone motor to solve the problem of excessive weight of drone motors in the prior art. The lightweight drone motor of this invention has a simple structure and effectively reduces its own weight, achieving an ultra-lightweight motor structure. The hollow structure also enables the motor to have better heat dissipation capabilities.
[0005] This utility model provides a lightweight drone motor, including a stator core, a rotor shaft, and a rotor disk. The rotor shaft is rotatably mounted in the middle of the stator core via bearings. The stator core has multiple first hollow holes. The bottom end of the rotor shaft is connected to the rotor disk, and the rotor disk is mounted on the bottom of the stator core. The rotor disk includes a support ring, a middle connecting part, and multiple connecting rods. The middle connecting part is connected to the bottom end of the rotor shaft. The support ring is spaced outside the middle connecting part. The multiple connecting rods are evenly distributed around the middle connecting part, with one end of each connecting rod connected to the middle connecting part and the other end connected to the support ring. A second hollow hole is formed between two adjacent connecting rods.
[0006] In a preferred embodiment of this utility model, the connecting rods are radially distributed around the intermediate connecting portion along the support ring.
[0007] In a preferred embodiment of this utility model, the number of connecting rods is even.
[0008] In a preferred embodiment of this utility model, there are 6 connecting rods.
[0009] As a preferred embodiment of this utility model, a mounting part is provided on the lower side of the rotor shaft, and a plurality of limiting blocks protruding around the rotor shaft are provided on the mounting part. A plurality of limiting grooves adapted to the limiting blocks are provided on the intermediate connecting part. When the rotor shaft is connected to the intermediate connecting part, the limiting blocks are disposed in the limiting grooves.
[0010] As a preferred embodiment of this utility model, the stator core includes an inner shaft cylinder, an outer retaining ring, and multiple support rods. The rotor shaft is rotatably mounted in the inner shaft cylinder via bearings. The outer retaining ring is spaced at the outer periphery of the inner shaft cylinder. The multiple support rods are evenly distributed radially along the outer retaining ring on the outer periphery of the inner shaft cylinder, and the support rods are connected between the inner shaft cylinder and the outer retaining ring. The first hollow hole is formed between two adjacent support rods.
[0011] As a preferred embodiment of this utility model, the support rod has four parts.
[0012] As a preferred embodiment of this utility model, it further includes a stator core, a magnet assembly, and a rotor yoke. The outer side of the stator core is coated with an insulating layer, and the stator core is sleeved on the outer side of the stator core. The magnet assembly is arranged between the stator core and the rotor yoke.
[0013] As a preferred embodiment of this utility model, the rotor shaft is an aluminum rotor shaft.
[0014] Compared with the prior art, the present invention has the following positive effects:
[0015] This utility model provides a lightweight drone motor, comprising a stator core, a rotor shaft, and a rotor disk. The rotor shaft is rotatably mounted in the center of the stator core via bearings. The stator core has multiple first hollow holes. The bottom end of the rotor shaft is connected to the rotor disk, which is mounted on the bottom of the stator core. The rotor disk includes a support ring, a central connecting part, and multiple connecting rods. The central connecting part is connected to the bottom end of the rotor shaft. The support ring is spaced outside the central connecting part. The multiple connecting rods are evenly distributed around the central connecting part, with one end connected to the central connecting part and the other end connected to the support ring. A second hollow hole is formed between adjacent connecting rods. This lightweight drone motor, by having multiple first hollow holes in the stator core and multiple second hollow holes in the rotor disk, achieves a hollow structure design for both the stator core and rotor disk, simplifying the motor structure and effectively reducing its weight, thus achieving an ultra-lightweight motor structure. Furthermore, the hollow structure also provides the motor with better heat dissipation capabilities. The motor of this invention is suitable for applications such as drones, portable devices, and robots where weight is a concern. It solves the problem of excessive weight in current drone motors. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the lightweight drone motor of this utility model.
[0018] Figure 2 This is an exploded view of the lightweight drone motor of this utility model.
[0019] Figure 3 This is a bottom view of the lightweight drone motor of this utility model;
[0020] Figure 4 for Figure 3 Cross-sectional view of AA.
[0021] In the diagram: 1. Rotor shaft; 11. Limiting block; 2. Bearing; 3. Stator core; 31. Inner shaft cylinder; 32. Support rod; 33. Outer retaining ring; 34. First hollow hole; 4. Stator core; 5. Magnet assembly; 6. Rotor yoke; 7. Rotor disc; 71. Intermediate connecting part; 711. Limiting groove; 72. Connecting rod; 73. Support ring; 74. Second hollow hole; 8. Magnet retaining ring. Detailed Implementation
[0022] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0025] Example 1:
[0026] This embodiment provides a lightweight drone motor, such as Figures 1-4 As shown, the device includes a stator core 3, a rotor shaft 1, and a rotor disk 7. The rotor shaft 1 is rotatably mounted in the middle of the stator core 3 via bearings 2. The rotor shaft 1 is mounted at the center of the stator core via two bearings 2, one above the other. The stator core 3 has multiple first hollow holes 34. The bottom end of the rotor shaft 1 is connected to the rotor disk 7, which is mounted at the bottom of the stator core 3.
[0027] The rotor disk 7 includes a support ring 73, an intermediate connecting part 71, and multiple connecting rods 72. The intermediate connecting part 71 is connected to the bottom end of the rotor shaft 1. The support ring 73 is spaced apart on the outside of the intermediate connecting part 71. The multiple connecting rods 72 are evenly distributed around the intermediate connecting part 71, with one end of each connecting rod connected to the intermediate connecting part 71 and the other end connected to the support ring 73. A second perforated hole 74 is formed between two adjacent connecting rods 72. The rotor disk 7 has a reliable structure and good support performance. The bottom end of the rotor disk 7 can be connected to the propeller blades, so that the rotor shaft 1 rotates to drive the rotor disk 7 and the propeller blades to rotate.
[0028] The lightweight drone motor in this embodiment features multiple first hollow holes 34 on the stator core 3 and multiple second hollow holes 74 on the rotor disk 7. Both the stator core 3 and rotor disk 7 are designed with a hollow structure, simplifying the motor structure and effectively reducing its weight, achieving an ultra-lightweight motor structure. Furthermore, the hollow structure also provides the motor with better heat dissipation. The motor of this embodiment is suitable for weight-sensitive applications such as drones, portable devices, and robots, solving the problem of excessive weight in current drone motors.
[0029] In one preferred embodiment, the rotor shaft 1 is an aluminum rotor shaft 1.
[0030] The rotor shaft 1 was changed from the traditional steel shaft material to 7075 aluminum, which reduced the weight of the rotor shaft 1 by two-thirds, thereby further reducing the weight of the motor.
[0031] In a preferred embodiment, the connecting rods 72 are radially distributed around the intermediate connecting portion 71 along the support ring 73. The multiple connecting rods 72 around the intermediate connecting portion 71 are subjected to centrifugal force during rotation, resulting in a more uniform force distribution on the rotor disk 7.
[0032] In a preferred embodiment, there is an even number of connecting rods 72. The even number of connecting rods 72 are evenly distributed around the intermediate connecting part 71, so that the rotor disk 7 is subjected to balanced forces during rotation, and has better load-bearing strength and structural stability.
[0033] In one preferred embodiment, there are six connecting rods 72. Preferably, the width of the connecting rods 72 gradually decreases from one end of the middle connecting portion 71 towards the end closer to the support ring 73 to balance the force.
[0034] In this embodiment, the rotor disk 7 uses 6 connecting rods 72 to form 6 second hollow holes, replacing the traditional entire disk surface. Through a large number of experiments, the hollow effect is verified, balancing weight and torque output, thus forming a rotor disk 7 with multiple advantages such as light weight, fast heat dissipation, and high structural strength.
[0035] In a preferred embodiment, a mounting portion is provided on the lower side of the rotor shaft 1, and a plurality of limiting blocks 11 protruding around the rotor shaft 1 are provided on the mounting portion. A plurality of limiting grooves 711 adapted to the limiting blocks 11 are provided on the intermediate connecting portion 71. When the rotor shaft 1 is connected to the intermediate connecting portion 71, the limiting blocks 11 are disposed in the limiting grooves 711. Specifically, there are four limiting blocks 11 and four limiting grooves 711, and the four limiting blocks 11 and four limiting grooves 711 are evenly distributed around the axis of the rotor shaft 1.
[0036] In this embodiment, by setting the limiting block 11 in the limiting groove 711, the rotation of the rotor shaft 1 can drive the rotor disk 7 to rotate synchronously, resulting in good driving stability.
[0037] In one preferred embodiment, the stator core 3 includes an inner shaft cylinder 31, an outer retaining ring 33, and multiple support rods 32. The rotor shaft 1 is rotatably mounted in the inner shaft cylinder 31 via bearings 2. The outer retaining ring 33 is spaced apart on the outer periphery of the inner shaft cylinder 31. The multiple support rods 32 are evenly distributed radially along the outer periphery of the outer retaining ring 33 on the outer periphery of the inner shaft cylinder 31, and the support rods 32 connect the inner shaft cylinder 31 and the outer retaining ring 33. A first hollow hole is formed between two adjacent support rods 32. The width at both ends of the support rod 32 is greater than the width in the middle.
[0038] In one preferred embodiment, there are four support rods 32. The four support rods 32 provide more stable support for the stator core 3 while increasing the space for the hollowed-out parts and reducing their own weight.
[0039] In a preferred embodiment, the lightweight UAV motor of this embodiment further includes a stator core 4, a magnet assembly 5, and a rotor yoke 6. The outer side of the stator core 4 is coated with an insulating layer using epoxy resin, achieving weight reduction and improved high-temperature resistance. The stator core 4 is fitted onto the outer side of the stator core 3, and the magnet assembly 5 is arranged between the stator core 4 and the rotor yoke 6. The top periphery of the rotor disk 7 abuts against the magnet assembly 5 and the rotor yoke 6. A magnet retaining ring 8 is provided on the top of the magnet assembly 5, and the magnet retaining ring 8 is located on the inner side of the magnet assembly 5 to limit the movement of the magnet assembly 5.
[0040] Specifically, when the motor of this embodiment is applied to a drone, multiple connection holes are provided on the middle connecting part 71 of the rotor disk 7, and the rotor disk 7 is connected to the propeller blades through these multiple connection holes. The rotor disk 7 is made of aerospace aluminum material, which further reduces its own weight.
[0041] The lightweight drone motor in this embodiment achieves a weight reduction of 30%-50% while ensuring the electromagnetic performance and mechanical strength of the motor. Specifically, it is 35% lighter than a traditional motor at the same power; the open structure improves airflow efficiency by 70% and reduces temperature rise by 15°C; simulation verification shows that the stress distribution in key parts is uniform and the fatigue life exceeds 20,000 hours.
[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications and improvements made by those skilled in the art without departing from the inventive concept of the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A lightweight unmanned aerial vehicle (UAV) motor, characterized in that, The device includes a stator core (3), a rotor shaft (1), and a rotor disk (7). The rotor shaft (1) is rotatably mounted in the middle of the stator core (3) via a bearing (2). The stator core (3) has multiple first hollow holes. The bottom end of the rotor shaft (1) is connected to the rotor disk (7). The rotor disk (7) is mounted on the bottom of the stator core (3). The rotor disk (7) includes a support ring (73), an intermediate connecting part (71), and multiple connecting rods (72). The intermediate connecting part (71) is connected to the bottom end of the rotor shaft (1). The support ring (73) is spaced outside the intermediate connecting part (71). Multiple connecting rods (72) are evenly distributed around the intermediate connecting part (71), with one end of each connecting rod (72) connected to the intermediate connecting part (71) and the other end connected to the support ring (73). A second hollow hole is formed between two adjacent connecting rods (72).
2. The lightweight UAV motor according to claim 1, characterized in that, The connecting rods (72) are radially distributed around the intermediate connecting part (71) along the support ring (73).
3. A lightweight unmanned aerial vehicle motor according to claim 2, characterized in that, The number of connecting rods (72) is even.
4. A lightweight unmanned aerial vehicle motor according to claim 3, characterized in that, There are 6 connecting rods (72).
5. A lightweight unmanned aerial vehicle motor according to claim 1, characterized in that, A mounting part is provided on the lower side of the rotor shaft (1), and a plurality of limiting blocks (11) protruding around the rotor shaft (1) are provided on the mounting part. A plurality of limiting grooves (711) adapted to the limiting blocks (11) are provided on the intermediate connecting part (71). When the rotor shaft (1) is connected to the intermediate connecting part (71), the limiting blocks (11) are disposed in the limiting grooves (711).
6. A lightweight unmanned aerial vehicle motor according to claim 1, characterized in that, The stator core (3) includes an inner cylinder (31), an outer retaining ring (33), and a plurality of support rods (32). The rotor shaft (1) is rotatably mounted in the inner cylinder (31) via a bearing (2). The outer retaining ring (33) is spaced at the outer periphery of the inner cylinder (31). The plurality of support rods (32) are evenly distributed radially along the outer retaining ring (33) on the outer periphery of the inner cylinder (31). The support rods (32) are connected between the inner cylinder (31) and the outer retaining ring (33). The first hollow hole is formed between two adjacent support rods (32).
7. A lightweight unmanned aerial vehicle motor according to claim 6, characterized in that, The support rod (32) has 4.
8. A lightweight unmanned aerial vehicle motor according to claim 1, characterized in that, It also includes a stator core (4), a magnet assembly (5) and a rotor yoke (6). The stator core (4) is coated with an insulating layer on the outside. The stator core (4) is fitted on the outside of the stator core (3). The magnet assembly (5) is arranged between the stator core (4) and the rotor yoke (6).
9. A lightweight unmanned aerial vehicle motor according to claim 1, characterized in that, The rotor shaft (1) is an aluminum rotor shaft (1).