A drone generally consists of five main systems: the flight control system, propulsion system, airframe structure, sensing and navigation system, and mission payload system. These systems work together through mechanical connections, electrical interfaces, and data communication to control flight, adjust attitude, determine position, and perform specific tasks.
The actual configuration varies according to the type of UAV. Multirotor drones generate lift primarily through motors and propellers, while fixed-wing UAVs rely on their wings to generate aerodynamic lift and use a propulsion system for forward movement. Component selection therefore depends on the aircraft configuration, flight performance requirements, and intended application.
Flight Control System
The flight control system is the central control unit of a drone. It processes flight data, calculates control commands, and coordinates the operation of different actuators to maintain the required flight attitude and movement.
Its main components include:
Flight controller board: Runs the flight control software, processes sensor data, and generates control commands. Some flight controller boards integrate an Inertial Measurement Unit (IMU) and barometer, and may also connect to a separate satellite navigation module through dedicated interfaces.
Attitude sensing unit: Typically consists of gyroscopes and accelerometers that measure angular velocity and linear acceleration. These measurements provide the data required for attitude estimation and flight stabilization. The sensors are often integrated into the flight controller board.
Communication unit: Includes remote control signal receivers and ground station communication equipment. These components receive flight commands, transmit flight status information, and support data exchange between the UAV and ground control system.
Power management is usually handled by a dedicated power management module or associated power circuits. The Electronic Speed Controller (ESC), on the other hand, belongs to the propulsion system and controls motor operation.
Propulsion System
The propulsion system provides the thrust required for flight. Its configuration depends on the UAV type and the energy source used.
The main components include:
Power output units: Common components include brushless motors, propellers, and ducted fans. Multirotor drones typically use multiple motors to drive propellers and generate lift and thrust. Fixed-wing UAVs use propellers or other propulsion devices according to their design.
Energy supply unit: Common configurations include lithium batteries, hybrid power systems, and fuel-powered systems. These provide the energy required to operate the motors or engines.
Electronic Speed Controllers (ESCs): Regulate the rotational speed of brushless motors by adjusting motor output according to control signals from the flight controller.
Transmission components: Some large fixed-wing UAVs use mechanical components such as reduction gears and transmission shafts to transfer engine output to the propulsion device and match rotational speeds according to the design requirements.
Airframe Structure
The airframe provides the main supporting structure of the UAV. It carries the flight control equipment, propulsion components, energy system, and mission payload while withstanding aerodynamic forces, vibration, and other mechanical loads during flight.
The main structural components include:
Frame and load-bearing structure: Multirotor drones generally use a central frame with multiple arms, while fixed-wing UAVs consist of a fuselage, wings, and tail assembly. Common materials include carbon fiber, aluminum alloy, and high-strength engineering plastics. Material selection depends on weight, stiffness, and load-bearing requirements.
Landing gear: Supports the UAV when it is stationary and absorbs loads during takeoff and landing. Depending on the operating environment, the landing gear may use wheels, skids, or floats.
Aerodynamic skin and outer housing: Covers and protects internal components while helping achieve the required aerodynamic shape. Some multirotor drones use an open-frame structure and do not require a complete aerodynamic skin.
Sensing and Navigation System
The sensing and navigation system collects information about the surrounding environment and determines the UAV's position, velocity, and attitude. This information supports autonomous flight, route control, and obstacle avoidance.
The main components include:
Obstacle detection sensors: Common devices include vision cameras, LiDAR, and ultrasonic sensors. They detect the distance, position, and relative movement of nearby obstacles, helping the UAV plan a safe flight path.
Positioning and navigation modules: These may use satellite navigation receivers such as GPS and BeiDou, or combine them with visual Simultaneous Localization and Mapping (SLAM) technology to build environmental maps and estimate the UAV's position from image data.
Attitude sensors: Gyroscopes and accelerometers measure angular velocity and linear acceleration, providing data for attitude estimation and flight control. These sensors may be integrated into the flight controller or installed as separate modules, depending on the system architecture.
Mission Payload System
The mission payload system consists of specialized equipment configured according to the UAV's intended application. It enables the aircraft to perform tasks such as aerial photography, surveying, inspection, agricultural operations, and material delivery.
The main components include:
Mission equipment: Depending on operational requirements, the UAV may carry aerial cameras, surveying radar, pesticide spraying equipment, payload release mechanisms, and other specialized devices. For example, surveying UAVs typically require suitable imaging or measurement equipment, while agricultural spraying drones may be equipped with chemical tanks, spraying systems, and associated control components.
Quick-release mounting interfaces: These connect the UAV airframe to the mission payload and may use standard or dedicated connection structures. A properly designed mounting interface allows different payloads to be replaced more easily while maintaining reliable mechanical strength, electrical connections, and data communication.
Custom Machining of Precision Parts for Drones
Drone structures contain frame connectors, motor mounting bases, transmission shafts, sensor brackets, payload mounting plates, and other precision mechanical components. Their machining processes and accuracy requirements depend on the UAV's structural dimensions, load requirements, and mounting interfaces.
Hansheng Automation provides custom precision machining based on customer drawings and accepts both single-piece and small-batch orders. In addition to drone structural components, our machining services also cover precision parts for yachts and RC racing cars, as well as components for tobacco packaging machinery and filling equipment. Parts are manufactured according to the structural and assembly requirements of each project.
