Sensorless DTC strategy devoted to the control of FSTPI fed induction motor drives

Abstract EN

The paper is aimed at the performance analysis of a sensorless direct torque control (DTC) strategy dedicated to four-switch three-phase inverter (FSTPI) fed induction motor (IM) drives.

This strategy has been considered in an attempt to improve induction motor drive reliability, compactness and cost-effectiveness, which represent crucial requirements in electric and hybrid propulsion systems.

These requirements could be achieved thanks to the substitution of the conventional six-switch three-phase inverter (SSTPI) by the reduced structure four-switch three-phase inverter (FSTPI).

A model reference adaptive system (MRAS)- based speed estimator has been found suitable for the proposed sensorless DTC strategy in so far as it involves the same induction motor model, that is the Clarke model.

It has been found through simulation work that the introduced sensorless DTC strategy exhibits high performance during transient and steady state operations.