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Measuring the dynamic forces to identify the friction of a graphite–copper contact for variable temperature and current |
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| Affiliation: | 1. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;2. Department of Mechanical Systems Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. College of Engineering Science and Technology, Shanghai Ocean University, 999 Hucheng Ring Road, Pudong, Shanghai 201306, China;4. New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan |
| 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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