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Servo motor refers to the engine that controls the operation of mechanical components in the servo system and is an auxiliary motor indirect speed change device. The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator and has the characteristics of a small electromechanical time constant, high linearity, and starting voltage. It can control the received electrical signal Converted into angular displacement or angular velocity output on the motor shaft. Divided into two categories of DC and AC servo motors, its main feature is that there is no rotation when the signal voltage is zero, and the speed decreases at a uniform speed with the increase of torque.