Direct Torque Control scheme for dual-three-phase induction motor

In this paper, Direct Torque Control (DTC) algorithms for dual three-phase induction motor fed by six phases Voltage Source Inverter (VSI) is described. The induction machine has two sets of three-phase stator windings spatially shifted by arbitrary angle. The machine dynamic model is based on the vector space decomposition theory. Optimal switching strategies to control the machine for different winding shift angles are proposed, the selection is based on the value of the stator flux and the torque without need for any mechanical sensor. Then, the amplitude and the rotating velocity of the flux vector can be controlled freely. Both approaches are simulated for dual three-phase induction motor (DTPIM). The results obtained show that both fast torque and optimal switching logic can be obtained.