This paper proposes the use of linear estimation techniques to determine th
e electrical parameters of a three phase induction machine. The linear regr
ession models are derived from the dynamical machine model. The method perm
its estimation of a set of four basic parameters namely the stator resistan
ce, the rotor time constant, the stator inductance and the transient induct
ance. The parameters are estimated using only sinusoidal PWM voltage wavefo
rm with a single machine operating point. In the case of the stator resista
nce estimation a de voltage is added to sinusoidal voltage. Moreover, to es
timate the transient inductance, the stator inductance and the rotor time c
onstant no special signals are required. The data vector employed in the es
timation procedure is obtained from the phase measurement data. Several sim
ulation and experimental results concerning the use of the proposed approac
h to the modeling of a three phase induction machine are presented.