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Effect of Abrasive Machining on the Electrical Properties Cu 86 Mn 12 Ni 2 Alloy Shunts

机译：磨削加工对电特性Cu 86 Mn 12 Ni 2合金分流器的影响

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This paper studies the effect of abrasive trimming on the electrical properties of Cu 86 Mn 12 Ni 2 Manganin alloy shunt resistors. A precision abrasive trimming system for fine tuning the resistance tolerance of high current Manganin shunt resistors is proposed. The system is shown to be capable of reducing the resistance tolerance of 100 μΩ shunts from their standard value of ±5% to <±1% by removing controlled amounts of Manganin material using a square cut trim geometry. The temperature coefficient of resistance (TCR), high current, and high temperature performance of the trimmed shunts was compared to that of untrimmed parts to determine if trimming had any detrimental effect on these key electrical performance parameters of the device. It was shown that the TCR value was reduced following trimming with typical results of +106 ppm/°C and +93 ppm/°C for untrimmed and trimmed parts respectively. When subjected to a high current of 200 A the trimmed parts showed a slight increase in temperature rise to 203 °C, as compared to 194 °C for the untrimmed parts, but both had significant temporary increases in resistance of up to 1.3 μΩ. The results for resistance change following high temperature storage at 200 °C for 168 h were also significant for both untrimmed and trimmed parts with shifts of 1.85% and 2.29% respectively and these results were related to surface oxidation of the Manganin alloy which was accelerated for the freshly exposed surfaces of the trimmed part.
机译：本文研究了修整对Cu 86 Mn 12 Ni 2锰合金分流电阻器电性能的影响。提出了一种用于微调高电流锰锰并联电阻器电阻容限的精密磨料修整系统。通过使用方形切边几何形状去除受控量的锰锰合金材料，该系统能够将100μΩ分流器的电阻容限从其标准值的±5％降低到<±1％。将修整后的分流器的电阻温度系数（TCR），高电流和高温性能与未修整过的分流电阻的温度系数进行比较，以确定修整是否会对器件的这些关键电气性能参数产生不利影响。结果表明，修整后TCR值降低，未修整和修整零件的典型结果分别为+106 ppm /°C和+93 ppm /°C。与未修剪的零件的194°C相比，修剪过的零件在承受200 A的大电流时，温度升高到203°C略有增加，但两者的电阻暂时都明显增加，最高可达1.3μΩ。对于未修剪的零件和修整的零件，在200°C的高温下储存168小时后的电阻变化结果也很重要，其偏移分别为1.85％和2.29％，这些结果与锰合金的表面氧化有关，加速了修整零件的新近暴露表面。

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