本研究實現以DSP為基礎的控制器，同時控制兩軸進給驅動伺服機構。我們將兩軸伺服機構考慮成具多變數的單一系統，方式是以交叉耦合關聯兩軸動力方程式。目的在證明此種方式可有效降低路徑誤差。在低速或速度變化小的情況下，PID控制法則提供足夠的精確度。實驗證明直線路徑時，PID與交叉耦合造成的路徑誤差幾乎相同。但實驗顯示高速或速度變化大時，例如圓弧路徑，PID控制的路徑誤差擴大，而交叉耦合控制則有效降低路徑誤差。這種改進路徑誤差的方法，在高速或精密加工等製造程序上相當有應用潛力。 In this research, we implement control algorithms on DSP-based controller to simultaneously control both axes of a feed drive servomechanism. The two-axis servomechanism is modeled as a single system with multiple variables. The dynamic equation of each axis is related by a cross-coupled relationship. The objective of this research is to improve contour errors of the two-axis servomechanism with a cross-coupled controller. In the situation of low speed or small variation of velocity, a PID controller provides satisfactory accuracy. Experimental results show that there is no significant difference in contour errors between the PID controller and the cross-coupled controller in the cases of line contours. On the other hand, in the situation of high speed or large variation of velocity , experimental results present large contour error in circular contour by using a PID controller. A significant reduction of contour error is achieved by inserting a cross-coupled controller between two axes. The controller is constructed on a DSP controlled two-axis servomechanism and compared to uncoupled controllers. The improvement of contour accuracy has the potential of application in manufacturing processes such as high speed and precision machining.
關聯:
中國機械工程學會第十三屆全國學術研討會論文集(控制)=Proceedings of the Thirteen National Conference of the Chinese Society of Mechanical Engineers，頁41282
