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.
Application of DC Servo Motor
- Radars
- Tracking and guiding system
- Process controller
- Computer and machine tools
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