Two-reaction theory of synchronous machines generalized method of analysis-part I

TLDR

The study begins by assuming no saturation or hysteresis and a sinusoidal armature phase distribution, deriving general formulas for current, voltage, power, and torque under steady and transient loading. The paper aims to derive detailed formulas for short‑circuit, starting, and small‑deviation conditions, and to create accurate equivalent circuits for parallel synchronous and asynchronous machines, with a plan to extend the analysis in a follow‑up. The methodology generalizes the analysis to machines with salient poles, any number of rotor circuits, field pole collars, or amortisseur windings, enabling the derivation of the aforementioned formulas and equivalent circuits.

Abstract

Starting with the basic assumption of no saturation or hysteresis, and with distribution of armature phase m. m. f. effectively sinusoidal as far as regards phenomena dependent upon rotor position, general formulas are developed for current, voltage, power, and torque under steady and transient load conditions. Special detailed formulas are also developed which permit the determination of current and torque on three-phase short circuit, during starting, and when only small deviations from an average operating angle are involved. In addition, new and more accurate equivalent circuits are developed for synchronous and asynchronous machines operating in parallel, and the domain of validity of such circuits is established. Throughout, the treatment has been generalized to include salient poles and an arbitrary number of rotor circuits. The analysis is thus adapted to machines equipped with field pole collars, or with amortisseur windings of any arbitrary construction. It is proposed to continue the analysis in a subsequent paper.