StaGeDis established new conceptual designs for a dual-use starter/generator disconnect system. New generation aircraft require higher levels of electrical power, increasing weight and volume of the electrical machines. In order to compensate this increase of weight and volume the generator was able to operate as an electric starter, eliminating the need of pneumatic starter.

Due to safety reasons, the starter/generator required a disconnection system to protect the machines and engine gearbox. This disconnection system was able to separate mechanically the gearbox from the starter/generator with the electrical machine operating whether as starter or generator. This system was commanded by an electrical pulse.

Different technologies and architectures were studied, evaluated and compared in order to define a proper disconnection system. Criteria of compactness, weight reduction and conformity with harsh aeronautic engine environment were also an important part of the study.

The selected solution required a detailed design and the definition and methodology of the verification tests.