Parameter estimation of induction machines under sinusoidal PWM excitation

This paper proposes the use of linear estimation techniques to determine the electrical parameters of a three phase induction machine. The linear regression models are derived from the dynamical machine model. The method permits estimation of a set of four basic parameters namely the stator resistance, the rotor time constant, the stator inductance and the transient inductance. The parameters are estimated using only sinusoidal PWM voltage waveform with a single machine operating point. In the case of the stator resistance estimation a DC voltage is added to sinusoidal voltage. Moreover, to estimate the transient inductance, the stator inductance and the rotor time constant no special signals are required. The data vector employed in the estimation procedure is obtained from the phase measurement data. Several simulation and experimental results concerning the use of the proposed approach to the modeling of a three phase induction machine are presented.