Evaluation of vector and direct torque controlled strategies for cage rotor induction motor drives

This paper investigates field orientated methods of control. Direct and indirect vector control are investigated in both voltage and current controlled forms. Direct torque controlled methods are also investigated and it is found that direct torque control is of less complexity and provides improved control characteristics when compared with vector control methods. A new direct torque controlled strategy is considered in detail and it is shown that the use of a more complex switching table with a mapping algorithm provides improvement.