Abstract
In a positioning servo-system, the ideal response can be obtained through Posicast control or Bang-bang velocity feed-back control. But the perfection of that responce depend entirely upon stability of the magnitude of the input signal.
Then, in this work, a new control algorithm (we call hysteresis control) is proposed to eliminate the influence of the input signal.
In this algorithm, a velocity feedback through a hysteresis element is introduced in a servo system modeled by a “second order system” to accomplish the Posicast control principle without influence of the input signal.
Several simulations were carried out to evaluate the effectiveness of the hysteresis control in real positioning servo-systems, and the following points were noted:
-For servo-systems with higher order-lag system which can be approximated by a “second order-lag system with deadtime”, it is also possible to accomplish the Posicast control principle without influence of the input signal (finite time settling response without oscillations is obtained).
-Even in systems with saturation features, it is possible to accomplish the Posicast control principle without influence of the input signal.
Finally, some experiments were done in a servo-system control for DC servo-motor to confirm that the proposed method generates a simple control structure with good response features.
