Uninterrupted Power Supply - Synchronous Motor/Generator Type

This paper discusses the development of a type of engine-driven generating unit which supplies uninterrupted power to a critical load, when the commercial or prime power supply fails. This particular type of unit uses the principle that a synchronous electric machine will act as a motor when prime power is available and the same machine will act as a generator when driven by an inertia system or a combustion engine. This development has made available to the Engineer and the Physicist an economical and reliable uninterrupted power supply to support their complex electronic and nuclear equipment.