Servo systems find extensive applications in position controllers. A typical example is in automatic positioning of radar. The position of radar changes during tracking. In order to determine the new position, the current position from the desired position is determined. The error is amplified and a control signal is sent to the controller. Thus, radar changes to its new position. This is also true in case of servo stabilizer.

The DC Servo motor demonstrator is a Microprocessor based trainer. An optical position feedback sensor gives the status of the current position, to the controller. As the desired position is fed into the instrument, the difference between the current position and the desired position in terms of angular displacement is computed, and a control is issued.

Using this trainer, the student learns how to program to position the shaft of the motor for the following:

• Program to run the motor in clockwise and anti-clockwise direction,
  
• Program to stop the motor after 1 rotation or multiples of 1 rotation,
  
• Program to change the direction of rotation after one rotation/s,
  
• Program to count the number of rotations executed,
  
• Program to position in steps of 5 degree or multiples of 5 degrees.
  
• The trainer consists of a DC Motor operating at 12V DC. The feedback is provided by two optical sensors. The interface electronics has amplifiers, detectors, drivers and power supply

Specifications:

• 12V DC operated motor.
  
• Optical sensor to detect the current position of the shaft of the motor.
  
• Built-in signal conditioners, power drivers, and power supply.

Note: This experimental module can be interfaced to all Microprocessor trainers, Micro control trainers or IBM PC Add – on card Model: IBR-1.