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Open AccessArticle

Effect of Abrasive Machining on the Electrical Properties Cu86Mn12Ni2 Alloy Shunts

1
Department of Mechanical and Construction Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
2
Vice Chancellors Office, Teesside University, Middlesbrough TS1 3BA, UK
*
Author to whom correspondence should be addressed.
Materials 2017, 10(8), 876; https://doi.org/10.3390/ma10080876
Received: 10 May 2017 / Revised: 21 July 2017 / Accepted: 21 July 2017 / Published: 29 July 2017
(This article belongs to the Section Manufacturing Processes and Systems)
This paper studies the effect of abrasive trimming on the electrical properties of Cu86Mn12Ni2 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. View Full-Text
Keywords: abrasive machining; Manganin alloy; shunt resistor abrasive machining; Manganin alloy; shunt resistor
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Misti, S.N.; Birkett, M.; Penlington, R.; Bell, D. Effect of Abrasive Machining on the Electrical Properties Cu86Mn12Ni2 Alloy Shunts. Materials 2017, 10, 876.

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