Effect of combined velocity and pressure on life time of carbon brushes

Author

El-Refaie, A.M.F. ; Aziz, M. M Abdel ; Khorshid, S.A.Y. ; Elzahab, E. E M Abu

Author_Institution

Fac. of Eng., Cairo Univ., Egypt

Volume

15

Issue

2

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

176

Lastpage

180

Abstract

The value of contact resistance between copper sliprings and carbon brushes, in wound-rotor induction motors, has a profound effect on the performance of these machines. The increase of this resistance due to bad contact may be detrimental. In this paper, an important factor affecting the resistance is introduced. This is the PV factor (product of contact pressure and peripheral speed). It represents the frictional power density at the interface; and it is also an indication of the volumetric or linear wear rate. A relation between the operational life time of brushes and the PV factor is experimentally deduced

Keywords

brushes; contact resistance; friction; induction motors; machine testing; rotors; wear; carbon brushes life time; contact pressure; contact resistance; copper sliprings; frictional power density; linear wear rate; peripheral speed; pressure effect; velocity effect; volumetric wear rate; wound-rotor induction motors; Brushes; Contact resistance; Copper; Electric resistance; Friction; Induction motors; Rough surfaces; Surface roughness; Switching circuits; Traction motors;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.866996

Filename

866996