What is the KV value of the brushless motor for the drone? How does it work?

Many people enjoy playing with drones, either for showing off their flying skills or for taking photos and videos, etc. Some others are more interested in the internal structure of drones, such as the brushless motor power structure, including its working principle and the meaning of the KV value. So, what is the KV value of the brushless motor in a drone? How does it work? Now, NOYU will simply give you a brief explanation to help you understand! Hope it can be helpful to you! 
 

The KV value of the brushless motor of the drone: 
The performance of the drone largely depends on the KV value and voltage of the brushless motor. For model aircraft brushless motors, the KV value varies; some are as low as a few hundred to around three thousand, while others can reach five or six thousand. 
The KV value indicates that when the motor is operating without load, for every 1 volt increase in voltage, the rotational speed increases by a certain amount. For brushless motors, this value is a constant. The rotational speed of the motor = KV value × voltage. For example, for a motor with a KV value of 1000, if it operates at a voltage of 10V, its rotational speed (in the absence of load) is 10,000 revolutions per minute. 
The same size and specification of brushless motors: The brushless motors with more stator coils have a lower KV value and relatively smaller output current, but have greater torque; the brushless motors with fewer stator coils have a higher KV value and larger output current, but have smaller torque. 
The lower the KV value of the motor is, the greater the power of the motor is, but the speed is lower; while the higher the KV value is, the smaller the power of the motor is, but the speed is faster. 
All drones are equipped with brushless motors. Without the brushless motor, a drone cannot fly. It is one of the core components. Of course, the brushless motor is closely related to the propeller, battery, and ESC. I hope these little facts can be helpful to everyone!