AgPd电刷与镀金滑环系统接触电压波动分量分析

K. Sawa, Yutaka Takemasa, Yoshitada Watanabe, T. Ueno, Masaru Yamanoi
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引用次数: 3

摘要

研究了主要用于贴片机的镀金滑环与AgPd电刷配合体系的劣化过程。过去的试验表明,润滑剂对获得较长的使用寿命是非常重要的。润滑油不仅可以减少环的磨损,而且可以防止环被氧化。在工作中,接触电压降通常在试验开始时低而稳定,并随着工作时间的增加而增加。本文对其波动特性进行了详细的观察,并观察到以下特征。接触电压波动随运行时间的延长而增大,但各环的波动模式不同。接触电压波形的最小值在20mV左右几乎保持恒定。在某些环上,最大值可高达180mV。然而,高峰值环的表面形貌与低峰值环的表面形貌基本相同。此外,峰值很大程度上依赖于转速。在低速时,峰值接近最小值。由此推断,接触电压的增加受刷环之间润滑剂厚度的控制,而不受环表面本身的影响。这表明隧道效应阻力是重要的。讨论了峰值与寿命的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fluctuation components of contact voltage at AgPd brush and Au-plated slip-ring system with lubricant
The authors have investigated the deterioration process of the system of Au-plated slip-rings mating with AgPd brushes, which is used mainly in chip-mounters. Past tests have shown that the lubricant is very important for obtaining long lifetime. The lubricant can not only decrease ring wear but also protect the ring from oxidation. In operation the contact voltage drop is generally low and stable at the beginnings of tests and increases with the operation time. In this paper the fluctuation characteristics are observed in detail and the following characteristics are observed. The contact voltage fluctuation increases with the operation time while the fluctuation pattern is different at each ring. The minimum value of the contact voltage waveform stays almost constant around 20mV. The maximum value can become as high as 180mV on some rings. However, the surface morphology of rings with high peak values is almost the same as those with low peak value. Further, the peak value is greatly dependent on rotational speed. The peak value approaches the minimum value at low speeds. From these results it is deduced that the contact voltage increase is controlled by the lubricant thickness between brush and ring and not from ring surface itself. This indicates that tunnel effect resistance is important. The relationship between peak value and lifetime is discussed.
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