The three-phase induction machine that operates under the specific conditions of dynamic braking can be translated as an induction machine under variable state, transient and unbalanced. This duty can be analysed by using first order differential equations that contains nothing but the total fluxes of the phase windings and the rotation angle of the rotor. Consequently, the currents are excluded and there is a reduced number of variables. One of the most important conclusion of the study refers to the dynamic braking time, which is significantly influenced both by the initial moment when the d.c. source is connected to the stator winding and by the source polarity

Keywords: Induction machine, Mathematical model in total fluxes, Transient dynamic braking duty