Magnetic Model Identification of Wound Rotor Synchronous Machine Using a Novel Flux Estimator

In this article, an online method is proposed to find the magnetic model of a wound rotor synchronous machine (WRSM). To identify the magnetic model, the stator flux is first estimated by considering two auxiliary variables and using a partially known model of the WRSM. Using this model, the stator flux is estimated at the $dq$ reference frame. Then, to identify the magnetic model or in other words to find the relationship between the machine flux linkage and the machine currents, the stator flux is mapped in terms of stator and rotor excitation currents. To validate the proposed method, simulations and experimental tests are carried out on a WRSM.