NDLI: Wear rate reductions in carbon brushes, conducting current, and sliding against wavy copper surfaces

Content Provider	IEEE Xplore Digital Library
Author	Bryant, M.D. Tewari, A. Jau-Wen Lin
Copyright Year	1994
Abstract	Wear tests are presented in which a carbon brush, loaded by a constant force spring, conducts current and slides against smooth and wavy copper rotors. The wavy rotors possessed surface waves of tens to hundreds of microns. With brush current varying from 0 to 40 A, carbon brushes slid over the smooth and wavy rotors and wear rates (/spl mu/g/s) were plotted versus rotor speed. Wear rates on the wavy rotor were generally less than wear rates on the smooth rotor, with and without current. Wear rates on the wavy rotor were considerably less than corresponding wear rates on the smooth rotor at certain rotor speeds. Evidence suggests that wear rates were most reduced at those rotor speeds where surface waves on the wavy rotor passing beneath the brush caused the brush-stiffness-rotor system to resonate. Studies of contact voltage drop suggest that under these resonant conditions, the brush and rotor stayed connected. Also, no evidence of arcing or micro-arcing was found on the copper track. This study shows appreciable reductions (up to 50%) in wear rate possible on brush rotor systems by prescribing tiny surface waves on the rotor and running the rotor at speeds such that the surface waves induce microvibrations and resonance.<>
Sponsorship	Ericsson IEEE Components, Packaging and Manufacturing Technology Society
Starting Page	375
Ending Page	381
Page Count	7
File Size	769852
File Format	PDF
ISSN	10709886
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Brushes Copper Friction Surface waves Vibrations Resonance Abrasives Temperature Thermal stresses Surface resistance
Content Type	Text
Resource Type	Article
Subject	Engineering

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