Vectorial torque control (VTC): a novel approach to torque and flux control of induction motor drives

A general approach to torque and flux control of induction motor fed by a VSI is described in the paper. It is independent on which kind of flux is controlled: rotor or stator flux. On this ground, an algorithm can be set up which allows the generation of the inverter switching patterns as a function of the reference values both of the electromagnetic torque and of the controlled flux. Experimental comparisons with traditional direct torque control and field oriented control techniques confirm the possibility to achieve very high dynamic performances with the proposed strategy