Power transfer system for a gas turbine engine

A power transfer system, the power transfer system comprising:

• a first pressure spool of a gas turbine engine structured to rotate and compress a working fluid to a first pressure;
• a second pressure spool of a gas turbine engine structured to rotate and compress the working fluid to a second pressure different than the first pressure;
• and
• a coupled electric machine having a first coupled rotor and a second coupled rotor, the coupled electric machine configured to transfer a mechanical power between the first pressure spool and the second pressure spool via electromagnetic interaction between the first coupled rotor and the second coupled rotor.

A method of operating a power transfer system, the method comprising:

• rotating a first pressure spool of a gas turbine engine;
• as a result of rotating the first pressure spool, rotating a first coupled rotor of a coupled electric machine, the coupled electric machine having a second coupled rotor in electromagnetic interaction with the first coupled rotor, the second coupled rotor mechanically coupled to rotate with a second pressure spool of the gas turbine engine;
• and
• transferring a mechanical power from the first pressure spool of the gas turbine engine to the second pressure spool via the electromagnetic interaction between first coupled rotor and the second coupled rotor.