Variable coupling of turbofan engine spools via open differential or planetary gear set with torque coupling for power extraction and engine operability

摘要

A system for transferring mechanical torque variably between a plurality of rotating machines in a turbofan engine (10). Two devices are used, where the first device relies upon magnetic properties of a planetary magnetic gearbox (50) to couple the magnetic machines. The second device is used to variably control the torque transfer between the magnetic machines. The system couples rotating shafts (52, 54) rotating at differing speeds within a turbofan engine (10) for controllably transferring power. To transfer power in the system, a fixed gear ratio is obtained by coupling the relatively high- and low-speed engine shafts (52, 54) to an epicyclic magnetic gearbox (50).