Measurements and simulation of induction machines flux linkage characteristics adopting rotor field orientation

The focus of this work is on the finite-element prediction and experimental measurement of stator and rotor flux linkages for induction machines. The purpose is to characterize the stator and rotor flux linkages adopting a rotor field oriented reference frame. The proper basic set of equations is inspired from the direct field oriented control approach, in order to indirectly derive the rotor flux linkage from the measurement of the stator flux. The proposed method requires a small set of preliminarily known parameters, such as the stator resistance and the overall leakage inductance. Moreover, the only measured quantities are voltages and currents, from which the fluxes are derived. The adopted strategy offers also the possibility to estimate electromagnetic torque and rotor resistance, using the rotor field oriented model equations. A complete finite-element validation is reported for comparison.