伺服系统飞车原因分析与解决措施

Causes Analysis and Solutions of Runaway Speed of Servo System

飞车是光电装备伺服系统的常见故障之一,在转动角度受限的轴系中,飞车会导致机械限位被撞击甚至撞坏,光机结构及连接线受损。目前伺服控制系统大多采用传统的软件限位的方法来抑制飞车,但其作用有限,在控制软件死机的情况下将失去限位作用。为有效解决飞车问题,对导致伺服系统飞车的因素及作用机理进行了分析。提出了几种新的防飞车方法,特别是设计不依赖于软件的底层硬件防飞车电路,工作有效可靠,是一种抑制伺服飞车的有效方法,并在光电装备的实际工作中得到了验证。

A runaway speed of servo system is an ordinary fault.It will strike and damage the mechanical limit in an axis system with limited rotation.The optical machine structure and the cable would be destroyed.Currently,a traditional software spacing is used to restrain runaway speed in servo control system,but it is limited.Software spacing will be invalid when control software crash.In order to solve the runaway problem,the causes and the principles of runaway speed of servo system are analysed in this paper.Several new methods to avoid runaway speed are presented.Especially,the bottom hardware circuit design to avoid runaway speed is effective and reliable.It is an effective method to avoid runaway speed of servo system and has been validated in the application of optical-electronic equipments.