Development in design of brushless self-excited and self-regulated synchronous generator

A developed model of brushless capacitor-excited synchronous generator of wound rotor type is presented. Approximate analysis is illustrated by using generalized machine theory. Theoretical results are investigated by using FEM simulation and animation. Comparison of design and time response characteristics between the developed, previous and DC exciter generator models are studied. In presented model, initial excitation is activated by residual magnetism and induced capacitor current in stator auxiliary winding. At load, it is self compensated with flat-compound characteristics, by making use of backward field of armature reaction and half- and also full-wave induced components in rotor windings. At steady state, the main magnetic field of rotor is much higher than the auxiliary field. At transient state, the alternating current in rotor auxiliary windings provides the machine with damping features. The construction is compact, maintenance free and easily applicable as 1 or 3 phases for multi-poles, wind generators; as well as two poles diesel-engine generators. More, a fair matching between theoretical and experimental prototype results is obtained.