Real-time estimation of the electrical parameters of an induction machine using sinusoidal PWM voltage waveforms

This paper proposes an online estimation technique to determine a set of four basic parameters [r_s, τ_s, l_s , σl_s] of a three-phase induction machine. The linear regression models are derived from the dynamic machine model. With the proposed approach, all the parameters, except the stator resistance r_s, are estimated using only a PWM voltage sinusoidal waveform. This study enables one to: (i) re-tune, online, the controller of the induction machine which has been detuned due to changes in the machine parameter; and (ii) to construct a parameter mapping of the induction machine in terms of its operating points. Several experimental results of the proposed approach in the modeling of a three-phase induction machine are presented