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US 8,522,526 B2Granted
Two-shaft engine for aircraft with high electric power demand
AssigneeRolls-Royce Deutschland Ltd & Co KG
InventorMetin Talan
Life of this patent
Estimating the term…
Abstract
With an engine for aircraft with high electric power demand, the power of the low-pressure shaft (7) operating in a lower speed range is transmitted to the high-pressure shaft (6) by an electromagnetic clutch (10). In the clutch element (14) on the side of the low-pressure shaft a frequency-controllable rotary field is generated, which drives a magnet (13) connected to the high-pressure shaft.
Claims14
A two-shaft engine for aircraft with high electric power demand, comprising:
- a high-pressure shaft connected to at least one generator and driven by a high-pressure turbine,
- a low-pressure shaft driven by a low-pressure turbine,
- an electronic engine control system,
- an electromagnetic clutch connecting the low-pressure shaft to the high-pressure shaft for non-contact transmission of power from the low-pressure shaft to the high pressure shaft in a variable speed relationship, the electromagnetic clutch also connected to the engine control system, and
- wherein the engine control system controls the electromagnetic clutch to create a freely settable frequency-controllable rotary field in the electromagnetic clutch to compensate for significant speed ratio differences from idle to flight power conditions between the low-pressure shaft and the high-pressure shaft that allows the low-pressure shaft to transmit power to the high-pressure shaft even though the low-pressure shaft operates at a lower RPM than the high-pressure shaft.
2 more elements
A method for controlling a two-shaft engine for aircraft with high electric power demand, comprising:
- providing a high-pressure shaft connected to at least one generator and driven by a high-pressure turbine,
- providing a low-pressure shaft driven by a low-pressure turbine,
- providing an electronic engine control system,
- providing an electromagnetic clutch connecting the low-pressure shaft to the high-pressure shaft for non-contact transmission of power from the low-pressure shaft to the high pressure shaft in a variable speed relationship,
- connecting the electromagnetic clutch to the engine control system, and
- controlling the electromagnetic clutch with the engine control system to create a freely settable frequency-controllable rotary field in the electromagnetic clutch to compensate for significant speed ratio differences from idle to flight power conditions between the low-pressure shaft and the high-pressure shaft that allows the low-pressure shaft to transmit power to the high-pressure shaft even though the low-pressure shaft operates at a lower RPM than the high-pressure shaft.
3 more elements
Dependencies are inferred from the claim text.