ABSTRACT
In the present day technology, electric drives have numerous applications ranging from rudimentary motion control to high-precision machine tools and robotics. A block diagram representation of a modern electric drive is shown in Fig. 1.1. The electric machine is assigned to do a certain mechanical work in terms of operating a load. Trains, rolling mills, paper mills, machine tools, cranes, excavators, elevators, pumps, robots, printers, etc., constitute typical loads on electric drives. Operation of a load is specified in terms of transient or steady torque, speed and/or position response requirements. The electric machine in the drive system should match the load requirements, obviously without exceeding the voltage and current limitations imposed by the machine and the associated power electronics.
