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Determination of the inductances of a salient pole synchronous machine based on the voltage equation of a single damper loop

An improved model for calculating the current distribution in salient-pole synchronous machines with internal faults or missing coils in the stator winding is established using the multi-loop method. For this purpose, a good knowledge of the time-depending inductances is necessary. In this paper, a calculation method is presented to determine the inductances of the damper winding, the mutual inductances between the field winding and the damper winding as well as the mutual inductances between the stator coils and the damper winding of a salient pole synchronous machine. The method presented here considers the analytical calculation of the magnetic flux density based on the magnetomotive force and the time-depending air-gap permanence.