Double-Armature Polyphase Synchronous Generator with Capacitive Excitation

An experimental study of a capacitively excited synchronous machine having armature windings on both rotor and stator is discussed. Voltage regulation, efficiency, and power output data show the machine to be a compact, high-energy density, low-impedance source of electric energy. Effects of unbalanced resistive load and magnetic saturation are illustrated. Voltage regulation of 10 percent and electromagnetic efficiency of 84 percent have been realized, with the machine operating in the manner of a self-excited dc shunt generator without a voltage regulator.