Electrically and frictionally derived mound temperatures in carbon graphite brushes

Electrical Contacts, 1988., Proceedings of the Thirty Fourth Meeting of the IEEE Holm Conference on Electrical Contacts Pub Date : 1988-12-01 DOI:10.1109/33.31428

M. D. Bryant, Y. G. Yune

引用次数: 23

Abstract

Numerical and analytical simulations of mound temperatures are presented as the mound evolves from cold to hot. The temperature field about a thermal mound in an electrical brush is estimated using a heat conduction equation with frictional and electrical internal heat sources. Computed temperatures seem to agree with measured temperatures, but thermal nonlinearities can result in temperatures that are higher and hot zones that are larger than the mathematical sum of the frictional and joule thermal fields. It is found that combined heating coupled with nonlinear effects can significantly shorten the formation time of very hot temperature zones. Computed thermal fields mature within about 4 ms, the approximate lifetime of a stationary mound on the brush face. This suggests validity for the assumption that the mound is stationary on the brush during thermal evolution.<>

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碳石墨电刷中由电和摩擦引起的丘温

给出了土丘由冷到热演变过程中土丘温度的数值模拟和解析模拟。利用摩擦内热源和电内热源的热传导方程，估计了电刷内热丘的温度场。计算温度似乎与测量温度一致，但热非线性可能导致温度更高，热区大于摩擦和焦耳热场的数学总和。研究发现，结合非线性效应的复合加热可以显著缩短高温区的形成时间。计算的热场在大约4毫秒内成熟，这是一个固定的丘在刷面上的近似寿命。这表明在热演化过程中土丘在灌木上静止的假设是正确的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electrical Contacts, 1988., Proceedings of the Thirty Fourth Meeting of the IEEE Holm Conference on Electrical Contacts

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