Investigating the dependency of an induction machine's main inductance on the supply frequency

According to several papers, an induction machine's main flux path's saturation state is not only conditioned by the magnetizing current. In the paper at hand the dependency of the magnetization curve on the supply frequency is investigated. Measurements show that the flux linkage decreases with rising supply frequency. This should be considered when incorporating control algorithms based on the main inductance. The magnetization curves calculated from the data retrieved are presented and compared to FEM calculations for validation of the effect under investigation.