The paper shows the calculation mode of mathematical model parameters starting from catalogue data and presents the simplified mathematical model where are introduced the catalogue data as well as calculated parameters. This model is valuable for slow process. These parameters of the mathematical model can be determinated as well by experimental tests being structured in way to permit the determination of all the parameters. The stator resistance winding, the field winding one, the synchronous reactances longitudinal and quadrature unsaturated have been determinated by classic methods; for the determination of the other parameters one has employed the static methods (fixed rotor) – for the direct-axis d, the system is a quadripole permitting by a supplying of a terminal couple two kinds of tests by short-circuiting or by no load operation of the two other terminals.