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.