Compensation method of stator iron loss of vector controlled induction motor using robust flux observer

A vector control system of an induction motor is proposed to suppress influence of iron loss. It is pointed out that the rotor flux estimator contributes more to torque control linearity than the current controller. Therefore, it is proposed that a rotor flux observer which can suppress the influence of some parameter deviations, (especially that of rotor resistance), can be applied to decrease the sensitivity to iron loss resistance. Finally, some experimental results of improved torque control linearity are shown to verify effectiveness of the proposed system.