An Inductance Determination of a Synchronous Machine with Combined Armature Winding by Field Simulation Methods

A 3D scheme-field model of electromagnetic AC and DC energy conversion has been developed for the dynamic short-circuit modes of the combined armature windings of the synchronous machine. It allows taking into account the influence of design features, the effects of self-and mutual induction of the windings, the nonlinearity of the electrophysical and magnetic properties of active and structural materials on electromagnetic processes and the combined armature winding parameters of the synchronous machine. An approach is proposed for determining the DC leakage and mutual inductances of a combined armature winding of the synchronous machine armature. It is based on the decomposition of electromagnetic processes with help combinations of switching phases of the armature windings relative to the external field source by union of the phase windings electrical circuits and the geometric 3D area of the active armature of the synchronous machine. It was proved, that the magnetic coupling between the AC and DC inductive parameters of the armature windings does not exist. The reliability and accuracy of the results of numerical modeling are confirmed by the results of physical tests on a prototype.