A Differential Approach to Resistive Parameters Identification in Salient Rotor PM Synchronous Motors

This paper proposes a method for resistive parameters identification specific for vector controlled salient rotor permanent magnet synchronous motors, based on standard measurements of power, voltage, and current at machine terminals. The method is based on the particular two-values shape of the loss power-vs.-current characteristic, when the motor is operated at constant output torque, constant speed and variable direct current component. Such a shape allows to process the standard current/power/voltage measurements with a differential criteria, in order to minimize and theoretically cancel out the influence of non easily quantifiable phenomena affecting the parameters identification. The paper covers the illustration of the basic elements of the method, some issues on the implementation problems, and the experimental results achieved on a motor-drive system for cityscooter application.