A methodology for electromagnetic parameter estimation of an induction motor equivalent circuit based on the load curve test

The paper presents the methodology for electromagnetic parameter estimation of the considered equivalent circuits of induction machines, enabling the more effective usage of information obtained as a result of realisation of the measuring procedure “Load curve test” described in the standard PN-EN 60034-28: 2013. An evaluation of adequacy of electromagnetic parameters estimated in accordance with the aforementioned standard and the presented methodology has been performed on the basis of the comparison of impedance frequency characteristics of the tested induction motor derived from measurement with the corresponding characteristics calculated by means of motor mathematical models resulted from the studied equivalent circuits with estimated parameters. Additional verification of correctness of estimated electromagnetic parameters has been realized by confronting the steady-state power factor-speed, stator current-speed and torque-speed characteristics of the tested induction motor determined experimentally and through the machine operation simulations carried out with the use of the considered equivalent circuits.