论文部分内容阅读
本文论述了电接触噪声产生的机理及其减少的措施。从两个金属接触时表面产生的凝着现象出发,推导出电流主回路受凝着面大小所支配,在相对运动过程中,由于接触电阻的变化而产生电压变化—即电压噪声。噪声电压的大小是由接触材料的金属物理性质(即Wab/p的大小)决定的。从而提出选择电接触材料的依据。电压噪声是在机械的、物理的、化学的因素作用下,使接触电阻发生变化而引起的。而接触电阻的大小又与两接触面之间压力、材料、接触面形状、相对运动速度、表层厚度及污染情况等有直接关系。
This article discusses the mechanism of electrical contact noise and its reduction measures. From the phenomena of coagulation on the surface of two metal contacts, it is deduced that the current main loop is dominated by the size of the condensing surface. During the relative movement, the voltage changes due to the change of the contact resistance - that is, the voltage noise. The size of the noise voltage is determined by the metallic physical properties of the contact material (ie, the size of Wab / p). Therefore, the basis for choosing the electrical contact material is put forward. Voltage noise is caused by mechanical, physical, and chemical factors that change the contact resistance. The size of the contact resistance is directly related to the pressure between the two contact surfaces, the material, the shape of the contact surface, the relative speed of movement, the thickness of the surface layer and the pollution situation.