直流伺服系统的干扰抑制方法

Interference rejection method for D.C. servosystem

采用微机控制的直流伺服系统工作时会产生干扰问题，如碳刷与铜头间摩擦产生的火花引出的电磁干扰、ＰＷＭ信号驱动的电感负载而产生的传导干扰，来自交流电源的干扰、来自信号通道的干扰等等。通过大量实验分析，确定了产生干扰的来源，并提出了提高系统抗干扰能力的措施，对电源系统、接地、信号线的连接、微机抗干扰、感性负载的瞬态干扰等进行了处理，使系统稳定性得到了很大提高，各项指标均达到了设计要求。该方法对于提高电站自动化控制水平具有实用意义。

A computerized direct current servosystem may bring about some interferences when it operates, for example, electromagnetic interference caused by sparking due to friction between carbon brush and copper contact face, conductive interference caused by inductive load driven by PWM signal, and other interferences from alternating current power supply, signal channels etc. By means of extensive expriment and analysis, the sources of interference are determined and some anti interference measures are put forward. Power supply system, earthing, connection of signal lines, computers anti interference, and momentary interference of inductive load etc., are treated, so that the stability of the system has been greatly improved. All technical indices of the system meet the design requirements. This method has practical significance for improving automatized control level of power stations.