ELECTROHYDRAULIC SERVODRIVE Russian patent published in 1997 - IPC

FIELD: automatic control systems. SUBSTANCE: electrohydraulic servodrive includes sine-cosine transmitting selsyn kinematically connected with setting shaft and pickup for detecting velocity of said shaft, sine-cosine receiving selsyn, summing amplifier and hydraulic amplifier, first and second power cylinders with regulating member of hydraulic pump whose output is joined with respective pickup of cradle position. Input and output of said pickup are connected respectively with output of first tachogenerator and with second input of summing amplifier and with hydraulic motor by means of pump whose pumping and suction cavities are joined with pressure pickups. Output shaft of said hydraulic motor is joined with actuating axle and second tachogenerator whose output is connected with third input of said summing amplifier. Fourth and fifth inputs of said summing amplifier are connected with outputs of pressure pickups, its sixth input is connected with output of pickup for detecting velocity of setting axle. Shaft of pump is kinematically connected by means of coupling with shaft of gas turbine engine. Outputs of adjustable throttle are connected with inputs of first and second power cylinders. EFFECT: enhanced reliability of servodrive. 1 dwg