Sensitivity analysis of induction motor performance variables

Abstract

The effect of parametric variations in three phase induction motor such as stator resistance, rotor resistance, leakage and mutual inductances on the induction motor performance variables such as input power, output power, stator current, starting current, magnetizing current, power factor, efficiency, developed torque and starting torque have been analysed. A nonlinear polynomial of the induction motor is derived and solved for determining the slip using computational methods to estimate the realistic value of slip of the induction motor at different load conditions. The designer of high performance drive system requires the knowledge with changes in parameters. Sensitivity analysis of machine performance variables is carried out to predict the performance affected by parameter variations through mathematical and computational methods. The analysis is carried out using the equivalent circuit of induction motor, where core loss resistance is omitted and also using the exact equivalent circuit of the induction motor, where the core loss resistance is considered.