Laboratory for Dynamics of Machines and Structures 
Measuring the dynamic forces to identify the friction of a graphite-copper contact for variable temperature and current
 J. Slavič and M. Boltežar
Wear, Vol 260, Issues 9-10, May 2006, 1136-1144

download pdf   http://dx.doi.org/10.1016/j.wear.2005.07.016
Abstract
In this paper we present experimental and analytical techniques for identifying the coefficient of friction (COF) of a graphite electric brush sliding against a commutator for different contact temperatures and electric current densities. A direct measurement of the instantaneous dynamic forces is used to identify the coefficient of friction. The experimental example shows that the presented procedures can be used to determine the optimum operating ranges for the temperature and the electric current density.
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See also related papers:
[Modelling and Analyzing the Dynamics of an electric-motor brush],
[Simulating Rough Contacts and Run-in]
Authors

Professor

Janko Slavič, PhD

   Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  janko.slavic@fs.uni-lj.si
  +386 1 4771 226
jankoslavic     jankoslavic    
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Professor

Miha Boltežar, PhD

   Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  miha.boltezar@fs.uni-lj.si
  +386 1 4771 608
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