The Impact of Load on Waveform Distortion in the Signal Transmission of the Ring-Brush Sliding Electrical Contacts
Addressing the key device for the transmission of electrical energy and signals between the sliding and fixed mechanisms of the conductive slip ring and carbon brush(referred to as the ring brush),this study investi-gates the distortion pattern of waveforms in the signal transmission process of ring brush sliding electrical contact under different loads.Through the independently designed experimental device for transmitting sinusoidal signals of ring-brush sliding electrical contact,the results show that signal waveform distortion increases with the num-ber of ring-brush slides and decreases with the increase of contact pressure.Increasing the contact pressure can suppress the distortion of electrical signal waveforms.Furthermore,analysis of the ring brush contact surface using SEM and XPS reveals that signal waveform distortion is mainly caused by the friction film at the ring brush inter-face.The additional film resistance from the friction film leads to an increase in the contact resistance of the ring brush.At the same time,the friction temperature during the sliding electrical contact process gradually rises,and the content of oxidized copper in the friction film increases,leading to a larger film resistance.Therefore,the fric-tion film is the primary cause of changes in contact resistance and friction coefficient.
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