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US 7,745,950 B2Granted
Generator-starter system for a multi-shaft engine
AssigneeRolls-Royce Deutschland Ltd & Co KG
InventorRudolf Lueck
Life of this patent
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Abstract
In order to provide a high electric power for an aircraft via a generator driven by the engine, an additional free turbine is included in the hot-gas flow of the engine, which—equipped with generator-starter magnets (9) and surrounded by annularly arranged generator-starter coils (12)—forms a generator-starter turbine (5) and is connected to the high-pressure shaft (1) via an overrunning clutch (15), and hence, is also used for starting the engine.
Claims17
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.
2 more elements
Dependencies are inferred from the claim text.