The emerging role of dead-beat, direct torque and flux control in the future of induction machine drives

Induction machine drives have the potential to be a highly efficient candidate for variable load power conversion applications dominated by low per unit torque, medium speed duty cycles. To achieve efficiency, the key control variable is flux linkage, which is central to direct torque and flux controlled (DTFC) drives. Deadbeat DTFC drives, by switching at fixed rates, can seamlessly handle voltage/current limits, as well as with zero speed self-sensing methods. This paper explores the methods to achieve true deadbeat, DTFC control, deal with voltage and current limits, and be suitable for loss minimizing control and zero speed self-sensing control.