Influence of the filtration circuit parameters of an induction motor drive on stability

The paper analyzes a nowadays problem, the stability of the systems consisting in voltage and frequency static converter with direct current intermediary circuit - induction motor. In this purpose, there has been established the operational mathematical model obtained from the two-axes theory equations. This model has been used to conceive a Matlab program used for the stability analysis by the method of the roots geometric locus. The program has led to a few conclusions, verified by experience, regarding the influences of the filtration capacity and inductivity on the system stability.