Degradation Phenomenon of Electrical Contacts using a Micro-Sliding Mechanism: Minimal Sliding Amplitudes estimated under some conditions by the Mechanism (18)

摘要

Authors have developed the mechanism which gives damping vibration to electrical contacts by the reciprocal hammering-oscillation and by another mechanism which gives periodical micro-sliding to electrical contacts directly driven by a magmetostrictive actuator or a piezo-electrical one. ft was shown that each mechanism was able to make a test simulate an actual degradation phenomenon on electrical contacts by the influence of micro-oscillation. Using the above mechanisms and their models they have studied the influences of a micro-oscillation on contact resistance. In this paper, it was shown that there was a degradation phenomenon of electrical contacts by experimental results using the micro-sliding mechanism (MSM). Using the results the authors discussed the degradation phenomena in shorter term, about a day, on four types of conditions that the input waveform as external force was sinusoidal or rectangular and frictional force between male-pins and female-pins in a connector was usual or smaller. Consequently it was shown that there were (1) the minimal sliding amplitudes causing contact resistance fluctuations of electrical contacts and (2) the amplitudes correlating input waveforms and contact fiictional forces. The authors recognized that the phenomena occurred more frequently in actual static contacts under the influence of some oscillation or vibration. Because there were some scratches on the surfaces in spite of almost zero of contact resistance, it was recognized that the degradation phenomena of electrical contacts could occurred more frequently in actual static contacts.