AUTOMATIC PITCH VARIATOR FOR TURBO FAN BLADES OF AIRCRAFT ENGINES WITH CONTACTLESS CONTROL BETWEEN STATOR AND ROTATING HUB

摘要

Automatic and continuous variation of the blade pitch without mechanical contact for applications in aeronautical turbofans. The actuation of the adjustable blade-holder supports with seat in the rotating hub of the fan takes place through electric pulses applied on special coils integral with the stator. The generated magnetic force imparts the rotating torque to multiple endless screws conjugated to a common ring gear which rotates an annular disk to adjust the step angle of the blades.