Electronic compensator for an electrohydraulic servovalve

摘要

Electronic compensation apparatus for modifying an input control signal, to produce a drive signal for a torque motor of an electrohydraulic servovalve. The torque motor has a frequency variable response characteristic. The apparatus includes means to determine a first voltage magnitude across the armature of the torque motor when it is not moving; means to determine a second voltage magnitude across the armature of the torque motor when it is moving; and means to determine a difference voltage of the first and second voltages. The difference voltage measures the dynamic motion of the armature and provides a feedback control signal. The apparatus further includes compensation means responsive to the feedback control signal for compensating the electrohydraulic servovalve so as to avoid resonance, and feedback means connected to the compensation means for providing a modified control signal.