An improved model of saturated induction machines

Conventional models of induction machines represent instantaneous saturation of the magnetizing flux either by using saturation factors or by adjusting the tangential and slope reactances. These models are often inaccurate in predicting states of the machine during transient conditions such as online starting. To remedy these inconsistencies, an improved equivalent circuit model is proposed that accounts not only for the saturation effects in the stator and rotor teeth but also, independently, for saturation in both the rotor and stator cores. The model is compared with test results as well as with more conventional models. The model demonstrates an improvement over other known models showing that detailed representations of saturation effects could be important in induction machine analysis, particularly when the machine is subjected to large signal disturbances