Wireless power supply variable pitch propeller system and unmanned aerial vehicle

Abstract

The utility model discloses a wireless power supply variable pitch propeller system and an unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicle electromechanical equipment, the wireless power supply variable pitch propeller system comprises a wireless power supply variable pitch propeller, a gear reduction box and an engine which are connected in series, the wireless power supply variable pitch propeller is composed of a rotor, a stator and a variable pitch propeller module, and the variable pitch propeller module is fixedly connected with the rotor. And the stator is fixedly connected with the gear reducer. According to the utility model, non-contact energy supply is realized through a magnet exciting coil mutual inductance principle, and carbon brush abrasion and electric arc risks of slip ring power supply are thoroughly eliminated; compared with a hydraulic variable-pitch complex pipeline system, mechanical parts are reduced through wireless power supply, millisecond-level dynamic response is achieved in combination with closed-loop control of an unmanned aerial vehicle flight control computer, and meanwhile the hidden danger of hydraulic oil leakage is avoided; compared with the limitation of a mechanical variable-pitch rigid connecting rod mechanism, the modular design supports the synchronous control of a plurality of receiving units, realizes breakthrough in the three dimensions of reliability and maintenance cost, and is particularly suitable for the high-efficiency requirement in a high-speed rotating scene.

Description

Technical Field

[0001] This utility model relates to the field of electromechanical equipment technology for unmanned aerial vehicles (UAVs), specifically a wirelessly powered variable-pitch propeller system and an unmanned aerial vehicle. Background Technology

[0002] A variable-pitch propeller is a propeller that can automatically or manually change its blade angle according to flight speed and altitude. Its main function is to improve propeller efficiency by changing the blade angle under different flight conditions, thereby improving engine power utilization and aircraft flight performance. Based on the source of the variable-pitch power, the variable-pitch mechanism is divided into three types: hydraulic, electric, and mechanical. Different power sources are suitable for different types of propellers and aircraft. When selecting a propeller, factors such as aircraft size, purpose, power system type, and requirements for pitch accuracy and response speed must be considered.

[0003] Currently, propeller electric pitch control systems are mainly divided into two types: wireless power supply and slip ring power supply. Compared with slip ring power supply, wireless power supply has significant advantages in terms of convenience, maintenance cost, safety, efficiency, and reliability. Wireless power supply eliminates the need for physical contact, reduces wear and maintenance costs, and improves the overall reliability and safety of the system, making it the future development direction of propeller electric pitch control technology. Summary of the Invention

[0004] The purpose of this invention is to provide a wirelessly powered variable-pitch propeller system and an unmanned aerial vehicle to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wirelessly powered variable pitch propeller system, comprising a wirelessly powered variable pitch propeller, a gear reducer and an engine connected in series, wherein the wirelessly powered variable pitch propeller is composed of a rotor, a stator and a variable pitch propeller module, the variable pitch propeller module and the rotor are fixedly connected, and the stator and the gear reducer are fixedly connected.

[0006] The rotor includes rotor windings, rotor winding mounting base and voltage regulator rectifier PCB. Four sets of rotor windings are installed at one end of the rotor winding mounting base, and the voltage regulator rectifier PCB is installed on one side of the rotor winding mounting base.

[0007] The stator includes a stator winding and a stator winding mounting base. The stator winding is mounted on one end of the stator winding mounting base. The rotor winding is located on one side of the stator winding. The rotor winding and the stator winding are located between the rotor winding mounting base and the stator winding mounting base.

[0008] The variable-pitch propeller module includes a propeller cover, a variable-pitch motor PCB, a variable-pitch motor, a keyway coupling, a hub cover, a variable-pitch slider guide post, a variable-pitch lead screw, a variable-pitch nut, a variable-pitch slider, a blade assembly, a hub, a propeller cover bottom cover, and a spline coupling. The variable-pitch motor PCB is mounted on one side of the voltage regulator and rectifier PCB. The rotor winding mounting bracket is mounted on the hub. The blade assembly is mounted on the inner wall of the hub. A hub cover is mounted on one end of the hub, and the variable-pitch motor is mounted on the other end of the hub cover. The voltage regulator and rectifier PCB and the variable-pitch motor PCB are sleeved on the variable-pitch motor. Externally, a propeller cover is installed on the outside of the propeller hub. A keyway coupling is installed at the output end of the variable pitch motor and inside the propeller hub. A variable pitch screw is installed at one end of the keyway coupling. A variable pitch nut is threaded onto the surface of the variable pitch screw. The variable pitch nut is sleeved on the variable pitch slider. Guide posts are installed at one end of the propeller hub cover on both sides of the variable pitch screw. Both guide seats pass through the variable pitch slider through through holes. One end of the winding mounting seat between two adjacent rotor windings is installed on the bottom cover of the propeller cover. A spline coupling is installed at the other end of the propeller hub.

[0009] Optionally, the blade assembly includes a pitch roller, a pitch control arm, a combined bearing, a blade retaining ring, a blade, a fastening screw, and a locating pin. Four combined bearings are installed in a circumferential array inside the blade hub. A pitch control arm is installed on one side of the combined bearing. A fastening screw is installed in the middle of one end of the pitch control arm. One end of the fastening screw passes through the combined bearing and is connected to the blade. Locating pins are installed at one end of the pitch control arm on both sides of the fastening screw. A pitch roller is threaded onto the other end of the pitch control arm.

[0010] Optionally, the rotor winding consists of a rotor coil and a rotor core, with the rotor coil mounted on a rotor winding mounting base via the rotor core.

[0011] Optionally, the number of rotor windings is four pairs, and the four pairs of rotor windings are mounted in a circumferential array on the rotor winding mounting base.

[0012] Optionally, the stator winding consists of a stator coil and a stator core, with the stator coil mounted on a stator winding mounting base via the stator core.

[0013] Optionally, the number of stator windings is eight pairs, and the eight pairs of stator windings are evenly distributed in a circular array on the stator winding mounting base.

[0014] An unmanned aerial vehicle includes a body and a wirelessly powered variable-pitch propeller system as described in any of the preceding claims, mounted on the body.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention relates to a wirelessly powered variable-pitch propeller system and unmanned aerial vehicle (UAV). It achieves contactless power supply through the mutual inductance principle of excitation coils, completely eliminating the risks of carbon brush wear and arcing associated with slip-ring power supply. Compared to the complex piping system of hydraulic variable-pitch systems, wireless power supply reduces mechanical components and achieves millisecond-level dynamic response through closed-loop control of the UAV flight control computer, while also avoiding the risk of hydraulic oil leakage. Compared to the limitations of rigid linkage mechanisms in mechanical variable-pitch systems, its modular design supports synchronous control of multiple receiving units, achieving breakthroughs in reliability and maintenance costs, and is particularly suitable for high-efficiency requirements in high-speed rotation scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the wireless power supply variable pitch propeller of this utility model;

[0019] Figure 3 This is a schematic diagram of the rotor and stator installation of this utility model;

[0020] Figure 4 This is an exploded view of the variable pitch propeller module of this utility model;

[0021] Figure 5 This is an exploded structural diagram of the blade assembly of this utility model;

[0022] Figure 6 This is a schematic diagram of the internal structure of the propeller hub of this utility model;

[0023] Figure 7 This is a cross-sectional view of the propeller hub of this utility model;

[0024] Figure 8 This is a schematic diagram of the installation structure of the rotor coil and rotor core with the stator coil and stator core of this utility model.

[0025] In the diagram: A. Wireless-powered variable-pitch propeller; B. Gear reducer; C. Engine in series; 1. Rotor; 2. Stator; 3. Variable-pitch propeller module; 1-1. Rotor winding; 1-2. Rotor winding mounting base; 1-3. Voltage regulator and rectifier PCB; 2-1. Stator winding; 2-2. Stator winding mounting base; 3-1. Propeller cover; 3-2. Variable-pitch motor PCB; 3-3. Variable-pitch motor; 3-4. Keyway coupling; 3-5. Propeller hub cover; 3-6. Variable-pitch slider guide post; 3-7. Variable-pitch lead screw; 3-8. Variable-pitch... Nut; 3-9, Pitch slider; 3-10, Blade assembly; 3-11, Hub; 3-12, Blade cover; 3-13, Spline coupling; 1-1-1, Rotor coil; 1-1-2, Rotor core; 2-1-1, Stator core; 2-1-2, Stator core; 3-10-1, Pitch roller; 3-10-2, Pitch control arm; 3-10-3, Combined bearing; 3-10-4, Blade retaining ring; 3-10-5, Blade; 3-10-6, Fastening screw; 3-10-7, Locating pin. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Example 1

[0028] like Figures 1 to 8 As shown, the wirelessly powered variable pitch propeller system of this embodiment includes a wirelessly powered variable pitch propeller A, a gear reducer B, and an engine connected in series C. The wirelessly powered variable pitch propeller A is composed of a rotor 1, a stator 2, and a variable pitch propeller module 3. The variable pitch propeller module 3 is fixedly connected to the rotor 1, and the stator 2 is fixedly connected to the gear reducer B.

[0029] The rotor 1 includes a rotor winding 1-1, a rotor winding mounting base 1-2, and a voltage regulator and rectifier PCB 1-3. Four sets of rotor windings 1-1 are installed at one end of the rotor winding mounting base 1-2, and a voltage regulator and rectifier PCB 1-3 is installed on one side of the rotor winding mounting base 1-2.

[0030] The stator 2 includes a stator winding 2-1 and a stator winding mounting base 2-2. The stator winding 2-1 is mounted on one end of the stator winding mounting base 2-2. The rotor winding 1-1 is located on one side of the stator winding 2-1. The rotor winding 1-1 and the stator winding 2-1 are located between the rotor winding mounting base 1-2 and the stator winding mounting base 2-2.

[0031] The variable pitch propeller module 3 includes a propeller cover 3-1, a variable pitch motor PCB 3-2, a variable pitch motor 3-3, a keyway coupling 3-4, a hub cover 3-5, a variable pitch slider guide post 3-6, a variable pitch screw 3-7, a variable pitch nut 3-8, a variable pitch slider 3-9, a blade assembly 3-10, a hub 3-11, a propeller cover bottom cover 3-12, and a spline coupling 3-13. The variable pitch motor PCB 3-2 is mounted on one side of the voltage regulator and rectifier PCB 1-3. The rotor winding mounting seat 1-2 is mounted on the hub 3-11. The blade assembly 3-10 is mounted on the inner wall of the hub 3-11. A hub cover 3-5 is mounted on one end of the hub 3-11, and the variable pitch motor 3-3 is mounted on the other end of the hub cover 3-5. 3. The voltage regulator rectifier PCB1-3 and the variable pitch motor PCB3-2 are sleeved and installed outside the variable pitch motor 3-3. A propeller cover 3-1 is installed outside the propeller hub 3-11. A keyway coupling 3-4 is installed at the output end of the variable pitch motor 3-3 and inside the propeller hub 3-11. A variable pitch screw 3-7 is installed at one end of the keyway coupling 3-4. A variable pitch nut 3-8 is threaded onto the surface of the variable pitch screw 3-7. The variable pitch nut 3-8 is sleeved and installed on the variable pitch slider 3-9. Guide posts 3-6 are installed at one end of the propeller hub covers 3-5 on both sides of the variable pitch screw 3-7. Both guide posts 3-6 pass through the variable pitch slider 3-9 through through holes. The windings between two adjacent rotor windings 1-1 One end of each mounting bracket 1-2 is mounted on the propeller cover 3-12, and the other end of the propeller hub 3-11 is mounted with a splined coupling 3-13. The pitch-changing principle of the variable pitch propeller module is as follows: the variable pitch motor PCB 3-2 controls the rotation of the variable pitch motor 3-3, which in turn drives the variable pitch screw 3-7 to rotate through the keyway coupling 3-4. This causes the variable pitch slider 3-9 to move up and down along the variable pitch slider guide post 3-6. A magnet is installed on the variable pitch slider 3-9, allowing the Hall sensor on the voltage regulator rectifier PCB 1-3 (which connects to the variable pitch motor PCB 3-2 via a connector to transmit Hall signals) to detect through the holes on the propeller hub cover 3-5. The position of the variable pitch slider 3-9 is determined by the magnetic field strength of the magnet. The variable pitch roller 3-10-1 is located in the inner groove on the side of the variable pitch slider 3-9. When the variable pitch slider 3-9 moves up and down, it drives the variable pitch roller 3-10-1 to move along the inner groove of the variable pitch slider 3-9 and make a circular motion around the axis of the blade fixing ring 3-10-4. This causes the variable pitch roller 3-10-1 to drive the blade 3-10-5 to rotate around the axis of the blade fixing ring 3-10-4 to achieve the purpose of variable pitch. The wireless power supply device of the variable pitch propeller adopts the principle of mutual inductance of excitation coil to convert the magnetic energy generated at the stator end into electrical energy at the rotor end, which is used to power the variable pitch motor in the propeller cover.

[0032] Optionally, the blade assembly 3-10 includes a pitch roller 3-10-1, a pitch control arm 3-10-2, a combined bearing 3-10-3, a blade retaining ring 3-10-4, a blade 3-10-5, a fastening screw 3-10-6, and a locating pin 3-10-7. Four combined bearings 3-10-3 are arranged in a circular array inside the hub 3-11. A pitch control arm 3-10-2 is mounted on one side of each combined bearing 3-10-3. A fastening screw 3-10-6 is mounted in the middle of one end of the pitch control arm 3-10-2. One end of the fastening screw 3-10-6 passes through the combined bearing 3-10-3 and connects to the blade 3-10-5. The two ends of the fastening screw 3-10-6... One end of the variable pitch swing arm 3-10-2 on the side is equipped with a positioning pin 3-10-7, and the other end of the variable pitch swing arm 3-10-2 is equipped with a variable pitch roller 3-10-1 by thread. The variable pitch roller 3-10-1 is fixed to the variable pitch swing arm 3-10-2 by thread. The variable pitch swing arm 3-10-2 is fixed to the blade 3-10-5 by fastening screws 3-10-6 and positioning pins 3-10-7. Fastening screws 3-10-6 bear centrifugal force, and positioning pins 3-10-7 bear torque. The blade assembly 3-10 is fitted to the blade hub 3-11 by a combined bearing 3-10-3 and is limited by the blade retaining ring 3-10-4, thereby bearing the transmitted centrifugal force.

[0033] Optionally, the rotor winding 1-1 consists of a rotor coil 1-1-1 and a rotor core 1-1-2, with the rotor coil 1-1-1 mounted on the rotor winding mounting base 1-2 via the rotor core 1-1-2.

[0034] Optionally, the number of rotor windings 1-1 is four pairs. The four pairs of rotor windings 1-1 are installed in a circular array on the rotor winding mounting base 1-2. Since the hub 3-11 occupies a certain space, only 4 pairs of rotor windings 1-1 can be installed.

[0035] Optionally, the stator winding 2-1 consists of a stator coil 2-1-1 and a stator core 2-1-2, with the stator coil 2-1-1 mounted on the stator winding mounting base 2-2 via the stator core 2-1-2.

[0036] Optionally, the number of stator windings 2-1 is eight pairs. The eight pairs of stator windings 2-1 are evenly distributed in a circular array on the stator winding mounting base 2-2. The stator windings 2-1 are wired to the lithium battery in the cabin, and their current magnitude and direction are controlled by the flight control system.

[0037] The usage method of this embodiment is as follows:

[0038] Operating Condition 1 (Engine Not Started): When the UAV is in standby mode on the ground or the engine is not started, the flight control system activates the high-energy-density lithium battery pack in the cabin. The lithium battery supplies adjustable AC power to the stator winding 2-1 through the intelligent power distribution module. This AC power establishes an alternating magnetic field in the stator core 2-1-2. The rotor winding 1-1 generates an induced current through mutual inductance with the alternating magnetic field. This induced current is processed by the voltage regulator and rectifier PCB 1-3 and then supplied to the variable pitch motor 3-3 in the variable pitch propeller module 3, thereby performing the preset blade angle action and preparing the aerodynamics for engine start-up.

[0039] Operating Condition 2 (Engine Operation Status): After the UAV engine completes the ignition procedure and reaches idle speed, the flight control system activates the high-energy-density lithium battery pack in the cabin. The lithium battery supplies adjustable DC power to the stator winding 2-1 through the intelligent power distribution module. This DC power establishes a constant magnetic field in the stator core 2-1-1. Under the operation of the engine, the rotor winding 1-1 continuously cuts the magnetic field lines to generate induced current. This induced current is processed by the voltage regulator and rectifier PCB 1-3 and then supplied to the variable pitch motor 3-3 in the variable pitch propeller module 3, thereby performing the blade angle change action and enabling the propeller to achieve flexible pitch change effect under different flight attitudes.

[0040] II. Variable Pitch Pitch Operating Conditions

[0041] Operating Condition 3 (Ground Not Started): The engine is stopped, and the wireless power supply is in the operating condition 1 state. This keeps the variable pitch propeller blades at the minimum pitch (low angle of attack) position, reducing propeller inertial drag and facilitating subsequent startup.

[0042] Condition 4 (Takeoff Phase): When the engine reaches maximum power, the wireless power supply is in Condition 2 mode. Pitch adjustment increases the blade angle of attack, resulting in greater thrust per unit speed, optimizing engine load matching, and preventing over-revving due to excessive speed.

[0043] Operating Condition 5 (Flight Attitude Changes): During maneuvers such as climbs and turns, the wireless power supply operates in Operating Condition 2 mode, with dynamic pitch adjustment. During climbs, the pitch increases to compensate for lift loss while reducing engine speed to maintain torque balance; during dives, the pitch decreases to prevent the propeller from entering the stall zone; during rolls, asymmetric pitch changes (e.g., increasing the pitch on the left and decreasing it on the right) are used to assist the ailerons in enhancing roll torque. During level flight, depending on the flight speed, the propeller engine control system (ECU) also coordinates fuel supply and dynamic pitch adjustments to ensure maximum engine propulsion efficiency and optimal aerodynamic efficiency at each stage of flight.

[0044] Condition 6 (Landing Phase): During the approach phase (wireless power supply - Condition 2), the pitch decreases, reducing thrust; before touchdown (wireless power supply - Condition 2), it enters reverse pitch mode, generating reverse thrust, which, in conjunction with the braking system, shortens the takeoff distance; after coming to a complete stop (wireless power supply - Condition 1), it returns to minimum pitch, preparing for the next engine start.

[0045] Example 2

[0046] An unmanned aerial vehicle includes a body and a wirelessly powered variable-pitch propeller system as described in any of Embodiment 1, mounted on the body.

[0047] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. The conformal design details for the inflatable wing proposed in the solution are just specific examples of fixing via ropes. It should be noted that those skilled in the art can adjust or improve the specific details without departing from the technical design concept of this utility model. For example, the percentage of the pull points along the spanwise direction and the number of pull points at different positions can be changed. This case applies the conformal design of an inflatable wing to a drone. This method can also be used in airships, high aspect ratio flexible aircraft, and other aircraft. These should also be included within the scope of protection of this utility model, as they all fall under the effects achievable by this utility model. To reduce the additional drag caused by the surface attachments of the conformal design of the inflatable wing, the components are treated with a rectifier to reduce drag. This solution should also be considered a technical extension of this utility model and should be protected.

[0048] The present invention has been further described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A wirelessly powered variable-pitch propeller system, characterized in that: It includes a wirelessly powered variable pitch propeller (A), a gear reducer (B) and an engine in series (C). The wirelessly powered variable pitch propeller (A) is composed of a rotor (1), a stator (2) and a variable pitch propeller module (3). The variable pitch propeller module (3) is fixedly connected to the rotor (1), and the stator (2) is fixedly connected to the gear reducer (B). The rotor (1) includes a rotor winding (1-1), a rotor winding mounting base (1-2), and a voltage regulator and rectifier PCB (1-3). Four sets of rotor windings (1-1) are installed at one end of the rotor winding mounting base (1-2), and a voltage regulator and rectifier PCB (1-3) is installed on one side of the rotor winding mounting base (1-2). The stator (2) includes a stator winding (2-1) and a stator winding mounting base (2-2). The stator winding (2-1) is mounted on one end of the stator winding mounting base (2-2). The rotor winding (1-1) is located on one side of the stator winding (2-1). The rotor winding (1-1) and the stator winding (2-1) are located between the rotor winding mounting base (1-2) and the stator winding mounting base (2-2). The variable pitch propeller module (3) includes a propeller cover (3-1), a variable pitch motor PCB (3-2), a variable pitch motor (3-3), a keyway coupling (3-4), a hub cover (3-5), a variable pitch slider guide post (3-6), a variable pitch lead screw (3-7), a variable pitch nut (3-8), a variable pitch slider (3-9), a blade assembly (3-10), a hub (3-11), a propeller cover bottom cover (3-12), and a spline coupling (3-13). The voltage stabilization and rectification... A variable pitch motor PCB (3-2) is mounted on one side of PCB (1-3). The rotor winding mounting bracket (1-2) is mounted on the rotor hub (3-11). The inner wall of the rotor hub (3-11) is equipped with a blade assembly (3-10). A rotor hub cover (3-5) is mounted on one end of the rotor hub (3-11). A variable pitch motor (3-3) is mounted on one end of the rotor hub cover (3-5). The voltage regulator rectifier PCB (1-3) and the variable pitch motor PCB (3-2) are fitted together. A propeller cover (3-1) is installed outside the variable pitch motor (3-3), and a keyway coupling (3-4) is installed inside the propeller hub (3-11) at the output end of the variable pitch motor (3-3). A variable pitch screw (3-7) is installed at one end of the keyway coupling (3-4), and a variable pitch nut (3-8) is threaded onto the surface of the variable pitch screw (3-7). The variable pitch nut (3-8) is sleeved on the outside of the variable pitch motor. On the slider (3-9), one end of the hub cover (3-5) on both sides of the variable pitch screw (3-7) is equipped with a variable pitch slider guide post (3-6). Both variable pitch slider guide posts (3-6) pass through the variable pitch slider (3-9) through through holes. One end of the winding mounting seat (1-2) between two adjacent rotor windings (1-1) is installed on the bottom cover (3-12). The other end of the hub (3-11) is equipped with a spline coupling (3-13).

2. The wirelessly powered variable-pitch propeller system according to claim 1, characterized in that: The blade assembly (3-10) includes a pitch roller (3-10-1), a pitch control arm (3-10-2), a combined bearing (3-10-3), a blade retaining ring (3-10-4), a blade (3-10-5), fastening screws (3-10-6), and a locating pin (3-10-7). Four combined bearings (3-10-3) are arranged in a circular array inside the blade hub (3-11). A pitch control arm (3-10-5) is mounted on one side of each combined bearing (3-10-3). -2), a fastening screw (3-10-6) is installed in the middle of one end of the variable pitch swing arm (3-10-2). One end of the fastening screw (3-10-6) passes through the combined bearing (3-10-3) and is connected to the blade (3-10-5). A positioning pin (3-10-7) is installed at one end of the variable pitch swing arm (3-10-2) on both sides of the fastening screw (3-10-6). A variable pitch roller (3-10-1) is installed at the other end of the variable pitch swing arm (3-10-2) through a thread.

3. The wirelessly powered variable-pitch propeller system according to claim 1, characterized in that: The rotor winding (1-1) consists of a rotor coil (1-1-1) and a rotor core (1-1-2). The rotor coil (1-1-1) is mounted on the rotor winding mounting base (1-2) through the rotor core (1-1-2).

4. The wirelessly powered variable-pitch propeller system according to claim 3, characterized in that: The rotor windings (1-1) are in four pairs, and the four pairs of rotor windings (1-1) are mounted in a circular array on the rotor winding mounting base (1-2).

5. The wirelessly powered variable-pitch propeller system according to claim 1, characterized in that: The stator winding (2-1) consists of a stator coil (2-1-1) and a stator core (2-1-2). The stator coil (2-1-1) is mounted on the stator winding mounting base (2-2) via the stator core (2-1-2).

6. The wirelessly powered variable-pitch propeller system according to claim 5, characterized in that: The number of stator windings (2-1) is eight pairs, and the eight pairs of stator windings (2-1) are evenly distributed in a circular array on the stator winding mounting base (2-2).

7. An unmanned aerial vehicle, comprising: Includes a body and a wirelessly powered variable-pitch propeller system as described in any one of claims 1-6, mounted on the body.

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