Conventional power pick-up is generally based on systems with metal shoes running on rails at ground level, or an overhead pantograph with a carbon block running on a wire. These systems have reached their development limit at approximately 40 m/s. The authors discuss the problems associated with current collection, and the design, construction and testing of rotating brush devices for use with high-speed transit systems. Brass was found to be the most successful brush material, with mild steel also performing well. Test results indicated that a brass brush carrying 500 A at 120 m/s (430 km/h) would last 6500 km; and that if the current density was limited to about 250 A per brush then the mild steel brush could perform equally as well. It is concluded that (1) the feasibility of using rotating wire brushes for current collection at speeds up to 120 m/s has been proven. Whilst wear rates are not excessively low, they are economically acceptable for a system at this early stage of development; (2) improved wear rates should be achieved by concentrating on materials known to be resistant to fracture by repeated bending, and by the use of finer wire gauges; (3) in future development work, the force of interaction between the brush and rail should be studied in order to develop a suitable brush support system. This should preferably be based on a linear rail system. /TRRL/

  • Corporate Authors:

    Kalerghi Publications

    51 Welbeck Street
    London W1,   England 
  • Authors:
    • Appleton, A D
    • Bartram, T C
    • MacMichael, DBA
    • Fletcher, G
  • Publication Date: 1976-5

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 58-63
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00141501
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 3 1996 12:00AM