Power Modulator and Simple Electric Drive

Block Diagram of a simple electric drive:
· System employed for motion control are called Drives.
· Drives employed electric motors are known as “Electric Drives”
· Load is usually a machinery designed to accomplish a given task eg: fans, pumps, robots, trains and drills.

Power Modulator:
· Modulates the flow of power from the source to the motor in such a manner that the motor will modulate the speed – torque characteristics required by the load.
· During transient operation , such as starting , breaking and speed reversal , it restricts source and motor currents within permissible values.
· Converts electrical energy of the source in the form of suitable to the motor.
· Select the mode of operation of the motor (i.e) Motoring or Braking.