Power-Based Method for Computation of Induction Motor Per-Phase Equivalent Circuit Parameter Values Using Nameplate and Technical Catalogue Data

Abstract

This paper proposes and validates a power-based numerical search method for computation of the per-phase equivalent circuit parameter values of commercial IEC-compliant three-phase squirrel-cage induction motors using nameplate and technical catalogue data. For five different motors, the simulated input active power, total losses, input reactive power, stator current, efficiency, and power factor, at 100%, 75% and 50% load, using the equivalent circuit with the computed parameter values, are compared to the reference values obtained directly from the motor nameplate and technical catalogue data. This method leads to a relatively low percentage absolute difference between the simulated and reference values for a motor operating range between no-load and full load, regardless of the motor rated power. It is a fast, sufficiently accurate, and simple-to-apply method to obtain the equivalent circuit parameter values for steady-state simulation of line-operated three-phase induction motors, having relatively low sensitivity to numerical rounding, tolerances, and uncertainties associated with the values stated on the nameplate and in the technical catalogues of IEC-compliant motors.