DC Servo Motor : Characteristics

Construction of DC Servo Motor

• The construction of DC Servo motor is similar to that of separately excited DC Motor or Permanent Magnet DC Motor. 
• The speed control of DC Servo motor is done by armature voltage control.  
• The design of servo motor is done with high armature resistance therefore its torque – speed characteristic becomes linear and negative slope. 

Torque – Speed Characteristics of DC Servo Motor

• The negative slopes provide viscous damping for the servo drive system.
• The armature mmf and field mmf are show in the figure and they are 90 degree with each other. 
• It provides fast torque response. 
• A step change in the armature voltage produces quick change in the speed of the motor.

Download Power Point : DC Servo Motor 

Application of DC Servo Motor

• Radars
• Tracking and guiding system
• Process controller
• Computer and machine tools

You may also like to read these articles How to mitigate third harmonics? What do you mean by voltage harmonics and current harmonics? Types of reactors Function of shunt reactor