Introduction of Servo Motor

In the industrial application for automation technology,Servo motor is the one of common used for high technology equipment that provided more efficiency and precision tune for movement.It’s have a rotary actuator that can make it have a precise control for angular position.

Servo motors have small diameter rotors for low inertia to provide a rapid response. They are fractional to small integral Hp in size and they typically have resolver or encoders to provide very precise speed and position sensing.

They are also almost always Totally Enclosed Non- Ventilated (TENV) enclosures.Below I had listed 3 types of servo motors that commonly used for industrial application.

servo motor

Types of Servo Motor

1) AC Servo Motor

Two phase, reversible, induction motors with high resistance rotor winding. This provides a nearly linear speed-torque for accurate control.Similar stator winding configuration to a split phase AC, single phase, motor. The two stator winding are at right angles to each other.

2) DC Servo Motor

Because of the low armature inductive reactance these motors provide very fast and accurate response to start/stop command signals.Normally used in Computerized Numerically Controlled machines and similar equipment.

3) Brushless DC Servo Motor

Named Brushless DC Servo Motor because they are similar to a DC motor turned inside-out, they are not DC at all. They are supplied with 3 phase power to the startor creating a rotating magnetic field just as is done for an AC induction motor.

Effectively a synchronous AC motor, except, in place of a wound electro-magnet rotor, these use rare-earth permanent magnet rotors.The permanent magnet rotor locks in step with the rotating magnetic field.A drive system controls the AC frequency supplied to stator to control, direction, speed, and position.


  1. I want to know about difference between stepper motor and servo motor.

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