接近开关PRD18-7DN70℃动作距离变化率过大现象处理  

Deal with the high change rate of operation distance of proximity switch PRD18-7DN at 70℃

作　　者：钱宁 

机构地区：[1]奥托尼克斯电子(嘉兴)有限公司,浙江嘉兴314001

出　　处：《传感器世界》2013年第8期35-39,共5页Sensor World

摘　　要：电感式接近开关产品PRD18-7DN在70℃高温时的动作距离与20℃时的动作距离相比,动作距离偏小且动作距离变化率超过±10%,不符合产品规格的要求。在70℃高温此接近开关工作时,会产生动作距离不够,检测不到标靶物的情况,影响客户的使用。通过一系列的试验,测量出产品里的补偿回路电阻、LC振荡回路的电磁感应强度、温度变化和产品动作距离之间的相互关系。计算相关数据后,采用变更产品上的补偿回路电阻元器件来改善动作距离变化率超差的问题。A new inductive proximity switch PRD18-7DN is introduced in this paper, the operation distances of which at 70℃ arc smaller than those at 20 ℃ ,and the rates of change exceed 10 ℃. This perforrmance does not meet the production requirements. When PRDIS-7DN is working at 70 ℃, the operation distance detect the targets and customers cann experiments, in which the compensation is not enough that the switch cannot ot use it normally. Through a series of loop resistors in switches are measured, the relation among electromagnetic induction of LC oscillation circuit, temperature change and operation distances of products is given, a method is given by which the compensation resistors are changed to resolve the problem of high change rate of operation distance at 70 ℃

关 键 词：电感式接近开关 动作距离 变化率 负温度系数 热敏电阻 

分 类 号：TM564.7[电气工程—电器]