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电磁继电器贮存期接触电阻增长的动力学模型

, PP. 205-211

Keywords: 接触电阻,电磁继电器,表面绝缘膜,扩散,动力学模型

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Abstract:

电磁继电器贮存过程中,触点间的接触电阻超标是主要的失效模式,而触点间的阴离子扩散是导致触点表面绝缘膜增长、接触电阻增加的主要原因。本文分析了纯金属触点表面腐蚀膜的成膜机理,并根据扩散理论给出了接触电阻增长与触点间压力、接触压降以及环境温度的函数关系,建立了常闭触点间单个导电斑点的接触电阻增长动力学模型。该模型与其他学者的实测数据趋势一致,最后通过该模型的计算值与试验结果进行对比,进一步验证了提出的动力学模型的正确性,为进行触点贮存寿命的预测提供了新的思路和参考。

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