Calculation of the damper winding inductances of a synchronous machine

An improved model for calculating the current distribution in synchronous machines with cylindrical rotor and 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 damper winding and the field winding as well as the mutual inductances between the damper winding and the stator coils of a synchronous machine with cylindrical rotor. The method presented here considers the analytical calculation of the magnetic flux density based on the magnetomotive force and the time-depending air-gap permeance.