Induction motor parameters identification from bench tests using a Newton-Raphson method

A numerical procedure using a Newton-Raphson method for the calculation of induction motor model parameters is presented. The method, which requires a no-load and a blocked rotor test, is intended for steady state torque and efficiency evaluation of three-phase single-cage rotor induction machines within the rated range of operation. The performance of the method is analyzed in terms of speed of convergence as well as of sensitivity to measurement deviations in the essential quantities, yielding important conclusions. A comparison is also made with a corresponding procedure from IEEE-Std 112. Results obtained with motor data are presented confirming the capabilities of the presented approach.