IMPLEMENTATION AND SIMULATION OF DIRECT TORQUE CONTROL SCHEME WITH THE USE OF FPGA CIRCUIT

This paper presents a simple approach to design and implementation of Direct Torque Control (DTC) of three phase squirrel cage induction motor using Matlab/Simulink and FPGA software. The direct torque control of induction machine is a simple control. To maintain this simple control structure while at the same time improving the performance of the DTC drives two simple new techniques i.e. constant switching frequency and stator flux estimation are proposed. To maintain a constant switching a simple torque control is introduced to replace the three level hysteresis comparators. The magnitude and phase error associated with stator flux estimation based on voltage model is compensated by using simple compensator which is based on steady state operation