ELECTROHYDRAULIC SERVO VALVE FOR A HYDRAULIC ACTUATOR SERVO CONTROL, IN PARTICULAR FOR AN AIRCRAFT SERVO MECHANISMS CONTROL

摘要

The servovalve has in combination: (a) a rotary torque motor (1) having a limited angular movement; (b) a hydraulic distributor (2) capable of supplying fluid to the actuator and comprising a rotary shaft (10) coaxially connected to the torque motor (1); (c) a detector (3) of the angular position of the shaft (10) coaxial with said shaft, so that the motor (1), the distributor (2) and the detector (3) have their rotating parts (7, 10, 3a) coaxial and connected to rotate together; and (d) an adder (4) associated with an electronic amplifier (5) connected to the torque motor (1) and capable of receiving a given control voltage (E), the output of the detector (3) being connected to the input of the adder (4). This arrangement permits giving the same rotating movement to all the moving parts of the servovalve and consequently has the advantage of eliminating the play and friction which have an adverse effect on the precision and reliability of prior mechanisms.