Pitch control system for a variable pitch helix

摘要

The invention relates to a system for controlling the pitch for the propeller a variable pitch. / p & & p & this system comprises, for the mechanical thrust of a short pitch, an assistance device comprising a means is intended to control electrique245 adjust the pitch of the blades in a direction of the flag in the conditions of failure the thrust cited above given by an operation of the helix is of the angles of not being located in the interval [0196 beta, but is of the adjustments of power lying in the range of normal, not by the control of the motor diet regulator. These conditions are set in action and 195 connecting the two commutateurs190 moyen245 has a voltage source in order to increase the pitch of the blades in a direction of the flag, preventing thus operates in an excessive speed of the helix. / p & & p & the invention is used for preventing operation of the propeller speed of an aircraft engine.