The word "servo" comes from the Greek word for "slave". "Servo motor" can be understood as a motor that absolutely obeys the command of the control signal: before the control signal is sent, the rotor is stationary; when the control signal is sent, the rotor rotates immediately; when the control signal disappears, the rotor can stop immediately.

Servo motors are micro motors used as actuators in automatic control devices, and their function is to convert electrical signals into angular displacement or angular velocity of a rotating shaft. Servo motors, also known as executive motors, are used as executive elements in automatic control systems to convert received electrical signals into angular displacement or angular velocity output on the motor shaft.

Servo positioning is mainly realized by pulse; the rotor in the servo motor is a permanent magnet; the accuracy of the encoder depends on the accuracy of the servo motor.

The working principle of the servo motor:

Servo system (servomechanism) is an automatic control system that can output controlled quantities, such as the position, direction and state of the object, with any change in the input target (or given value). Servo mainly relies on pulses for positioning. Basically, it can be understood that the servo motor receives a pulse and will rotate an angle corresponding to a pulse to achieve displacement.

Since the servo motor itself has the function of sending out pulses, it will send out a corresponding number of pulses every time it rotates an angle, thus forming an echo or a closed loop with the pulses received by the motor. In this way, the system will know how many pulses are sent to the motor and how many pulses are withdrawn at the same time, so as to accurately control the rotation of the motor and achieve accurate positioning, which can reach 0.001mm.