Multi-rotor UAV is a kind of UAV composed of multiple rotors. Its main components include frame, motor, electric regulation, flight control, remote control, battery, etc. Each section has a specific function, which is described separately below.

ⅰ. Frame

The frame is the main structural part of the multi-rotor UAV, which is usually made of carbon fiber, aluminum alloy and other materials, and has the characteristics of lightweight, high strength and durability. The main function of the frame is to support various components, and it is also an important part of the UAV's appearance design.

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ⅱ. Power Combo System

The Power combo system is the power source of the multi-rotor UAV. It is responsible for driving the rotor to rotate and generate lift to enable the UAV to fly. Including motor, ESC(electronic speed controller) and propeller.

The motor is usually brushless motor, which has the advantages of high efficiency, low noise and long life. The speed and power of motor have important influence on the flight performance of UAV. ESC is an important part of Power Combo System, it is mainly used to control the speed and direction of the motor, so as to control the flight of UAV. The main function of ESC is to convert the signal sent by the flight controller into the control signal of the motor, so that the UAV can achieve a stable and smooth flight.

Propeller is a direct source of lift and thrust for UAV. The propeller has two basic sizes, diameter and pitch. According to the different materials can be divided into composite material propeller, carbon fiber propeller and nylon propeller. According to folding mode, it can be divided into foldable propeller and straight propeller.

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ⅲ. Flight Control

Flight control is the "brain" of multi-rotor UAV. It is the core component of UAV, which is used to control the flight attitude, position, speed and other parameters of UAV. Flight control usually includes sensors such as accelerometer, gyroscope, compass and barometer, through which the status information of the UAV is obtained, and then the control instructions are calculated through the built-in algorithm to control the flight of the UAV.

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ⅳ. Remote Control

Remote control is the operating equipment of multi-rotor UAV. It communicates with aircraft through radio signal to control the flight of UAV. The remote control usually includes a joystick, button, display screen and other parts, through which the UAV can take off, land, hover, forward, backward, turn left and right and other flight actions.

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ⅴ. Battery

The battery is the power source of the multi-rotor UAV, which provides the electric energy required by the UAV. Batteries are usually lithium batteries, which are characterized by high energy density and light weight. The capacity and voltage of the battery have an important effect on the endurance and flight performance of the UAV.

To sum up, the main components of multi-rotor UAV include frame, motor, electric regulation, flight control, remote control, battery, etc. Each part has a specific function, and they work together to enable the UAV to achieve stable, smooth and efficient flight.