Stator resistance tuning in a stator flux field oriented drive using an instantaneous hybrid flux estimator

A self-tuning control scheme for stator flux field oriented induction machine drives in electric vehicles operating over a wide speed range is discussed. The problem of calculating the stator flux accurately over the entire speed range is addressed. The rotor flux can be found from the machine speed and the rotor time constant. The stator flux, at low speed, is then calculated directly from the rotor flux. By alternating between these two methods of determining the stator flux, a self-tuning operation is achieved, wherein the stator and rotor resistances are periodically updated. Since both methods of determining the stator flux are forced to track one another, a smooth transition between flux estimators is obtained. The torque and flux are then controlled in a dead beat fashion. Good torque control over a wide speed range can therefore be obtained. With the proposed scheme, the advantages a direct torque control are obtained over the entire speed range with the addition of a speed sensor.