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The variation of the rotor time constant exerts a dominant effect in the performance degradation of the orientation of the rotor flux method of induction machine and the online estimation of the time constant (r T) is necessary in order to use it in the flux orientation and keeping the performance of the vector control. We presented our work vector control of induction machine by estimating and online adaptation of the rotor time constant of our machine only by measurement of voltage, current and speed, in line on the machine, to provide information to the orientation block on the variation of the parameter studied r T .