含前馈补偿和微分反馈的数控位置伺服系统

CNC Position Servo System with Feedforward Compensation and Differential Feedback

数控位置伺服系统的前馈控制具有动态响应快、跟踪精度高、实用性高等特点,在位置跟踪数控伺服系统中应用广泛,但对数控伺服系统的位置阶跃响应作用不明显,且超调量大。为此,提出在位置前馈控制的基础上,引入位置环微分负反馈的新型控制策略。在伺服系统位置环增加微分负反馈后,对前馈控制函数进行修正,使微分负反馈控制既能保证系统实现无超调快速响应,又不影响位置前馈跟踪性能。仿真和实验结果验证了该方法的可行性和有效性,表明该新型控制方法适用范围广,响应速度快,超调量小,具有很高的工程实用价值。

A feedforward control of CNC position servo system has many advantages as fast dy-namic response,high tracking accuracy,practicality and so on,and it is widely used in CNC position servo system.However,it has large overshoot and it contributes little in the step position servo sys-tem.Therefore,a new control method was proposed that the differential negative feedback control was introduced on the basis of the servo system feedforward control herein.With adding the differen-tial negative feedback,the feedforward control function was deduced again.So that the differential negative feedback could guarantee the little overshoot and rapid response,and had no bad effection in position tracking performance.The simulation and experimental results verify the feasibility and ef-fectiveness of the analysis and the design.The new control method is applicable to a wide range with its merits of fast response and great practical value.