Modeling the induction machine's main inductance as a function of the supply frequency and the magnetizing and the torque building component of the stator current

According to earlier work and papers by other authors, the main flux path of an induction machine is not only saturated due to the magnetizing current, or in other words ldquothe magnetizing inductance can be modeled as a function of torquerdquo. In addition, at a given magnetizing current, the flux linkage decreases with rising supply frequency. These effects should be considered when using control algorithms based on the main inductance, as for example rotor flux oriented control. In the paper at hand a method is proposed to extend the induction machine's standard fundamental wave model taking regard of the changes of the main inductance in dependence of the magnetizing and the torque building component of the stator current. In addition a method to estimate the required parameters is proposed. Validation is carried out via additional measurements and FEM calculations.