MODELS FOR INDUCTION MACHINES WITH MAGNETIC SATURATION OF THE MAIN FLUX PATH

A new nonlinear pi model for an induction machine operating in magneti c saturation has been developed, It is based on a magnetic circuit mod el of a rotor-stator tooth pair, with nonlinear reluctance elements re presenting the saturation in the rotor and in the stator. The model of a tooth pair is extended to a model of the machine by assuming an inf inite number of infinitesimal teeth. The model is compatible with the Blondel-Park transformation, Experimental measurements on a wound-roto r machine validate the new model. Operating conditions for optimal eff iciency at high torque levels requiring operation in saturation are co mputed.