Position servo control of the slider in double toggle mechanical press using Bezier curve model and fuzzy control

Abstract

Servo press is more flexible for forming process than conventional press. The position control of the slider is the key technique in the servo presses. In order to achieve an excellent position control performance of the slider, a position servo control strategy of the slider in a servo press - double toggle mechanical press is proposed in this paper. The control strategy combines the Bezier curve model and the fuzzy control methods. Firstly, the controlled mechanical object is described. Then, a Bezier curve model is established to accurately describe the control curves. Based on this Bezier curve model, the position servo control given curves of the crank for different processes are obtained. Afterwards, transverse flux machine (TFM) is selected as the servo motor for the control system because of its high force densities. Since TFM has complex nonlinear features, a Fuzzy-Proportional-Integral (fuzzy-PI) control method is presented to control the crank position for tracking the given curves. At last, the tracking curves for different processes are obtained. The results show that the control strategy can effectively achieve the flexible manufacturing of the press.