Back to results
US 10,647,439 B1Granted
Variable frequency power system for hybrid electric aircraft propulsion
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorRaymond F. Beach
Life of this patent
Estimating the term…
Abstract
A hybrid propulsion system for an aircraft is provided that includes a turbine engine, a first electric machine assembly connected to the turbine engine, a second electric machine assembly driven by the first electric machine assembly, and multiple third electric machine assemblies driven by the first electric machine assembly, wherein the multiple third electric machines provide a thrust output to propel the aircraft.
Claims5
A method of preparing a propulsion system of an aircraft for take-off comprising:
- starting a turbine engine having no electrical load connected thereto;
- running a generator in a sub-synchronous mode;
- increasing a speed of the turbine engine;
- exciting a rotor of a plurality of propulsion motors;
- running the propulsion motors in a sub-synchronous mode;
- increasing a frequency of the propulsion motors from sub-synchronous to synchronous;
- increasing a throttle speed;
- increasing a speed of the propulsion motors;
- and
- increasing an output thrust of the propulsion system;
- wherein the propulsion operates on a plurality of multi-phase electrical distribution systems, wherein each of the plurality of multi-phase electrical distribution systems are electrically isolated from each other, but operate as a single multi-phase electrical distribution system.
8 more elements
Dependencies are inferred from the claim text.