Search Results

Modular building blocks are used to configure VSCF converters of ratings varying from 40 to 110 kVA using an unvarying geometry for uniform circuit impedances. Rating changes are made via choice of transistor rating and by adjustment of the capacitive and inductive filter elements. The modular commonality greatly reduces development lead time and technical risk for new systems as well as reducing spares inventories and maintenance training. This paper describes the various modules and shows how rating changes are implemented. Alternate cooling means such as air or oil are discussed along with a description of physical adjustments necessary for cooling compatibility. Weight, size, and efficiency data are presented for all ratings and cooling methods.

This paper addresses the packaging considerations and techniques used in the design of a fully integrated VSCF package which is mounted on an engine accessory gearbox. Special design considerations such as vibration, altitude, and temperature in the gearbox area are discussed. A comparison and description of various methods of cooling, such as cold plate, immersion, and spray within a self contained cooling/lubrication system is also presented. The paper describes the integration of microprocessor modules, high power semiconductor arrays, and a high-speed generator, to form a compact, low weight VSCF system.