Determination of parameters in interior permanent-magnet synchronous motors with iron losses without torque measurement

This paper proposes systematic procedures to estimate the circuit parameters of an inverter-fed vector-controlled interior permanent-magnet synchronous motor when torque measurement is not available. The methodology presented here does not neglect iron losses. New procedures have been developed and justified since international standard recommendations (International Electrotechnical Committee Standards) cannot be applied. Experimental results from a test rig will be presented in this paper to validate the most important contributions. Thanks to the procedures proposed, secondary effects on the motor parameters, e.g., saturation or frequency dependency, have been evaluated.