A servo is a small device with an output shaft. The axis can be positioned to a specific angular position by sending a servo-encoded signal.

The micro servo is mainly composed of a housing, a circuit board, a drive motor, a reducer and a position detection element.

Brushless DC motor and DC motor are two concepts. Although the name of the brushless DC motor is DC, it is actually not a DC motor.

In terms of motor: the material, structure and processing technology of the servo motor are much higher than those of the AC motor driven by the inverter (generally AC motor or various frequency conversion motors such as constant torque and constant power)

The brushed motor has the advantages of simple structure and low price, and can provide higher torque.

The flight principle and structure of a helicopter is different from that of an airplane.