数控机床位置控制中非线性PID控制器的设计

Design of Nonlinear PID Controller for Position Control of NC Machine Tool

位置控制算法对数控机床的快速性、准确性和稳定性起着重要作用。传统PID控制器在数控机床位置控制中应用广泛,但存在诸多问题。在分析传统PID控制器原理及其缺陷的基础上,设计了一种非线性PID位置控制器,以位置偏差e为变参数,通过分析PID各环节的变化趋势特点设计各环节的非线性函数,从而建立一个非线性PID控制器模块。针对典型二阶、三阶数控进给系统的控制仿真表明:该非线性PID控制器在数控机床位置控制中比传统PID控制器有更好的动静态控制性能。

The position control algorithm plays an important role on the rapidity, accuracy and stability ot CNC machine tool.The traditional PID controller is widely used in position control of CNC machine tool, but still with many problems. On the basis of analyzing the theory and shortage of the traditional PID controller, a nonlinear PID controller is designed by using the warp e as parameter correction. Simulations of the two-order and the three-order CNC servo feeding systems prove that this nonlinear PID controller has better control performance than the traditional one.