Analysis of a Brushless Self-Excited Three-Phase Synchronous Generator with a Self-Regulating Feature

Abstract

The authors previously proposed a new brushless self-excited three-phase synchronous generator which utilizes the 2nd-space harmonic component of armature reaction field to produce a field current. Its operating principles and basic characteristics were clarified by experiment. This generator has the following advantages: (1) it can be made with a brushless structure without an ac exciter; (2) an output voltage of almost constant value can be obtained without an automatic voltage regulator (AVR); and (3) the generator itself has high quick-response characteristics.
This paper introduces a method of predicting the steady-state performance of the aforementioned generator. In the analysis, a magnetic circuit is drawn from the configuration of magnetic path of the generator, and an equivalent circuit is derived by using a duality between electric and magnetic circuits. Using this equivalent circuit, the generator's steady-state performance is theoretically predicted, and confirmed through experiment.