Patent ID: 11905887
Assignee: ROLLS-ROYCE PLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 17:
18. The method of claim 17, wherein:
the plurality of spools of each of the first and second gas turbine engines comprises a first spool and a second spool;
for each of the first and second gas turbine engines, the first electric machine is mechanically coupled with the corresponding first spool and the second electric machine is mechanically coupled with the corresponding second spool;
operating the one or more electric machines of the first gas turbine engine as one or more generators to extract mechanical power and generate electrical power from the one or more spools of the first gas turbine engine comprises:
operating both the first and second electric machines of the first gas turbine engine as generators to extract mechanical power and generate electrical power from both the first spool and the second spool of the first gas turbine engine; and

operating the one or more electric machines of the second gas turbine engine as one or more motors to limit a reduction in speed of the one or more spools of the second gas turbine engine comprises:
operating one or both of the first electric machine and the second electric machine of the second gas turbine engine as motors to drive rotation of the first spool and/or the second spool of the second gas turbine engine.