线绕电位器不规则阻值跳变的故障分析  

Failure Analysis of Parameter Random Variation Phenomenon of a Precision Wound Potentiometer

作　　者：陈雁[1] 段超[1] 王旭[1] 张伟[1] 

机构地区：[1]中国空间技术研究院,北京100029

出　　处：《电子产品可靠性与环境试验》2013年第2期5-8,共4页Electronic Product Reliability and Environmental Testing

摘　　要：对精密线绕电位器出现不规则阻值跳变的现象进行了分析,结合绕线电阻器结构的原理和实际检查结果,最终定位电位器下簧片接触点(电刷)向内弯曲角度偏大、导致接触区域向外偏移,且线圈绕组工作面残留漆层和簧片接触点压在可动绝缘的多余物上,最终导致簧片接触点与绕组接触不良引起电位器阻值跳变。提出在生产中需要加强质量控制,并对电位器提出了改进建议。Parameter random variation phenomenon of a precision wound potentiometer is analyzed. Combined with the structural principles of wound potentiometer and the actual checking result, the lower reed with larger inward bending angle leads to the contact area＇s moving outwards, the coil wire surface residue and upper reed press on the movable isolative residue at the same time. The above appearance leads to the parameter of the precision wound potentiometer varied randomly. Advices for the processing control and usage of this component are proposed.

关 键 词：线绕电位器 阻值跳变 改进 

分 类 号：TM547[电气工程—电器]