A self-excited induction generator with regulated voltage

THE synchronous generator with direct-driven exciter has several disadvantages when applied in airborne equipment. However, no competing system has succeeded in achieving a smaller weight in pounds per kva at a given speed. The practical difficulties are overcome at present by careful engineering, so that a reliable generating system is obtained. These difficulties relate to brush performance at high altitude, commutation at high speed, overhung moment due to the action of exciter, bracing of the rotor windings against centrifugal force, and high cost of manufacture.