Analysis of the Principles of Quadcopters
Release time:
2026-06-03
The core principle of a quadcopter (four-rotor drone) can be simply summarized as: controlling lift and torque through the speed differences of the four rotors to achieve flight attitude adjustment.
The core principle of a quadcopter (four-rotor drone) can be simply summarized as: controlling lift and torque through the speed differences of the four rotors to achieve flight attitude adjustment.
1. Basic Structure
Four rotors: paired in two groups, clockwise (CW) and counterclockwise (CCW) rotation, to cancel rotational torque.
Motors and flight controller: adjusting motor speed changes rotor speed, and the flight controller (including gyroscopes, accelerometers, etc.) senses the attitude and controls the motors.
2. Flight Control Logic
Vertical takeoff and landing:
All four rotors rotate at the same speed; the drone ascends when total lift > gravity, descends when less, and hovers when equal.
Forward/backward and left/right movement:
For example, for "forward motion": decrease the speed of the front rotors and increase the speed of the rear rotors, causing the body to tilt forward, and the horizontal component of lift pushes it forward.
Rotation (yaw):
Increase the speed of one group of rotors (e.g., clockwise group); its counter torque becomes greater than the other group, causing the body to rotate in the opposite direction (e.g., counterclockwise).
Attitude stabilization:
The flight controller uses sensors to detect attitude deviations (such as tilt or rotation) in real time and automatically adjusts rotor speeds to correct them.
3. Key Points
Force balance: lift opposes gravity, and torque is canceled by rotors spinning in opposite directions.
Core logic: by changing the speed of any rotor, the balance of force or torque is disrupted, achieving movement or turning.
Summary: a quadcopter relies on "speed differences" to play with mechanical balance, and the flight controller acts as the "brain" to adjust in real time, thus achieving flexible flight.
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