Abstract
This paper proposes a new control scheme for the electrode servo control system in an electricarc furnace. The cylinder is controlled by a servo valve along with two on-off control valves. The optimal opening and closing time of the on-off valves is determined by the principle of optimality. This can protect the zero velocity and acceleration at the stopping point of the cylinder as well as the minimum response time. By this kind of control, the servo valve gives the fast response and high position accuracy under small disturbance and the on-off valve control provides fast response and small impact following a large disturbace. Experiment and digital simulation are carried out for a step input, the two results are similar.
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