A New Fuzzy Logic Torque Control Scheme Based on Vector Control and Direct Torque Control for Induction Machine

It is well understood that Vector control (VC) scheme is very co mplicated and has slower torque response. Direct torque control (DTC) scheme is easier and has faster torque response, but it´ll bring the bigger torque ripples than those under VC. In this paper, a new fuzzy logic VC-DTC torque control scheme based on the common of vector control and direct torque control has been presented. The system uses a current VC scheme together with a DTC type switching table. Theoretical background of these schemes is outlined, and then a simulation test bench has been established for performance evaluation under a variety of control conditions. The comparison of motor performance under the proposed control system with respect to those obtained under DTC and VC confirms a faster dynamics than that of VC and less system variable pulsations than those under DTC and VC, which show the potential of applying fuzzy VCDTC torque control to induction machines.