Necessary conditions for the controllability on linear systems with positive control are presented. The real case is analyzed and the Jordan form representation is employed. The minimum number of necessary controls to obtain controllability is remarked.
The influence of the normalized load and the rotor time constant mismatch on the dynam-ical behavior of induction motors under indirect field oriented control (IFOC) is analyzed. We focus the analysis on the Takens-Bogdanov bifurcation using a recent generalization of the Takens-Bogdanov bifurcation Theorem. We have found a criterion that allows us to… (More)