The stator of the motor consists of a cylindrical frame and the magnet is attached to the inside of the frame.

It is more or less similar to the normal DC motor. DC Servo MotorsĪ DC servo motor consists of a small DC motor, feedback potentiometer, gearbox, motor drive electronic circuit and electronic feedback control loop. With the advancement of microprocessor and power transistor, AC servo motors are used more often due to their high accuracy control. These are best suited for smaller applications. Brushed permanent magnet DC servo motors are used for simple applications owing to their cost, efficiency and simplicity. So the error detector followed by a servo amplifier raises the voltage and power level of the error signal and then turns the shaft of the motor to desired position.īasically, servo motors are classified into AC and DC servo motors depending upon the nature of supply used for its operation. The error signal available at the output of error detector is not enough to drive the motor. This feedback signal is compared with input command position (desired position of the motor corresponding to a load), and produces the error signal (if there exist a difference between them). It uses encoder or speed sensor to provide speed feedback and position. Internally, a servo motor combines a motor, feedback circuit, controller and other electronic circuit.

Servo motors work on servo mechanism that uses position feedback to control the speed and final position of the motor. Servo motors have a high speed response due to low inertia and are designed with small diameter and long rotor length. Unlike large industrial motors, a servo motor is not used for continuous energy conversion.

Difference between the DC and AC Servo MotorsĪ servo motor is a linear or rotary actuator that provides fast precision position control for closed-loop position control applications.

Ac servo motor arduino