A Sudden Increase of Contact Voltage Drop at Gas Introduction into Low Pressure Atmosphere

概要

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The surface film of slip-ring is important for sliding contact phenomena. The surface film is changed by atmospheric temperature, humidity and air pressure. A main purpose of our study is to examine the effect of oxygen gas on the sliding contact phenomena. In the present experiment, weexamined the contact voltage drop for continuous sliding when the atmosphere is changed from the low pressure to atmosphere pressure by introducing oxygen(O_220%+N_280%)or nitrogen gas. As a result, the contact voltage drop increase rapidly with increasing gas pressure, and its fluctuation also becomes large. These phenomena are observed in both cases of oxygen(O_220%+N_280%)and nitrogen for introducing gasses. The results clearly show that the sudden increase of contact voltage drop is affected by the other factors except for oxide film. Actually, the oxide film is not formed in the nitrogen atmosphere. Furthermore, the coefficient of friction of carbon and copper ring is changed for ambient atmosphere. It is inferred from these data that the contact voltage drop may be affected by coefficient of friction. When the gas pressure decreases again, the contact voltage drop does not suffer from the effect of ambient gas. Therefore, the contact voltage drop only due to the film resistance seems to be predominant.
社団法人電子情報通信学会の論文
2001-09-20