Keywords: direct torque control, induction motor drives, fuzzy logic, fuzzy control, speed control, controller design, sliding mode control, flux control
High–performance direct torque and flux control of an induction motor drive using sliding–mode and fuzzy logic speed controllers
In this research study, direct torque and flux control of an Induction Motor Drive (IMD) using Sliding–Mode Speed Controllers (SMSC) and Fuzzy–Logic Speed Controller (FLSC) are presented to achieve high performance of stator current, electromagnetic torque and motor speed in both transient as well as in steady–state conditions. The PI Speed Controller (PISC) gives good steady–state performance, but poor dynamic response. Therefore, the SMSC is considered to achieve continuous control of motor speed and also electromagnetic torque. Furthermore, FLSC is considered to get high performance, dynamic tracking and speed accuracy at various load torque conditions. The performances of each speed controller techniques are tested under various load toque and speed condition for its robustness. A detailed comparison of different control approaches are carried out in a MATALB/Simulink environment at different operating conditions, such as forward and reversal motoring with no–load, load, sudden change in speed and sudden zero speed.