The invention relates to a method of identifying a resistance value (R _r) of the rotor of an electric motor (M) induction, which comprises the following steps:
a) Determining a reference voltage $\left(u_s^{\mathit{ref}}\right)$ in function of a value (R _r) chosen for the rotor resistance of the electric motor,
b) application of a control voltage (u _S) to the electric motor, said control voltage being determined from said reference voltage $\left(u_s^{\mathit{ref}}\right),$
c) Acquisition of the current values (i _1, i _2, i ₃₎ measured in the three phases of the electric motor so as to derive a stator current (i _S) of the electric motor,
d) stator current comparison (i _S) obtained with a predetermined value $\left(i_s^{\mathit{ref}}\right),$
e) Correction of the said value (R _r) used for the resistor (R _r) of the rotor and applying steps a) to d) until a stator current (i _S) equal to said predetermined value.