Load Controller for Constant Speed Drive for Parallel Aircraft Electrical Systems

This paper discusses the design of a realload controller for an airborne four generator parallel system. In addition to providing an electric trim for the hydraulic constant speed drive governor, the controller transfer function is shaped to introduce the required compensation for parallel system stability. A lag-lead-lag transient function, having rather large time constants, is generated solely by using the control winding interactions of full wave magnetic amplifiers. This results in improved performance over wider temperature ranges than is practical with designs using resistor-capacitor networks.