Patent ID: 7745950

Claim:
A generator-starter system for a multi-shaft engine, comprising: a generator-starter coupled to a high-pressure shaft of a high-pressure turbine of the engine for generating electric power and for starting the engine, the generator-starter comprising: a free generator-starter turbine arranged in a hot-gas duct of the engine downstream of the high-pressure turbine, the free generator-starter turbine including a plurality of generator-starter magnets positioned around a periphery thereof to form a generator-starter rotor; a generator-starter stator positioned adjacent the generator-starter magnets; an overrunning clutch axially connecting the free generator-starter turbine to the high-pressure shaft; at least one of variable guide vanes positioned upstream of the generator-starter turbine and variable turbine blades positioned on the free generator-starter turbine, the at least one of variable guide vanes and variable turbine blades constructed and arranged to control a rotational speed of the free generator-starter turbine to control electrical output from the generator-starter.