State-Space Space-Vector Model of the Induction Motor Including Magnetic Saturation and Iron Losses

This paper proposes a space-vector dynamic model of the rotating induction motor (RIM) taking into consideration both the magnetic saturation and the iron losses expressed in a state form. Such a model tries to improve some issues of the previously developed dynamic models. The main original aspects of the proposed model are the following: the magnetic saturation of the iron core has been described on the basis of both current versus flux and flux versus current functions; the model is based on the complete T space-vector electrical scheme of the RIM; two different state formulations have been proposed; it includes the iron losses, separating them in hysteresis and eddy current ones; and it includes the effect of the load on the magnetic saturation. The proposed model has been implemented in numerical simulation in MATLAB/Simulink environment and validated experimentally on a suitably developed test set-up based on a low-power RIM. The proposed model has been exploited also to simulate the behavior of a high-power RIM.