DIRECT DRIVE ELECTRICALLY-GEARED TURBOFAN

The present disclosure provides for a direct drive electrically-geared turbofan via a first magnetic gearbox assembly (210A) connected to a fan (150) of a turbofan engine (100); a second magnetic gearbox assembly (210B) connected to a spool shaft (160) of the turbofan engine (100); and a speed controller (500) configured to adjust a rotational speed of the fan (150) based on a rotational speed of the spool shaft (160) by selectively coupling and decoupling the first magnetic gearbox assembly (210A) with the second magnetic gearbox assembly (210B). In various examples, the first or second magnetic gearbox assembly (210A, 210B) includes a permanent magnet array (340), while a different one of the first or second magnetic gearbox assemblies (21 0A, 210B) includes a rotor winding (330) separated from the permanent magnet array (340) by an air gap (230); and the speed controller (500) is configured to selectively couple and decouple the first and second magnetic gearbox assemblies (210A, 210B) with each other via controlling a switch (320) in a winding circuit (310) with the rotor winding (330).