ELECTROMAGNETIC EDDY CURRENT BRAKE (SNCF TRIALS)

In order to avoid the dependence of braking effect on the adhesion of the wheels to the rails, experiments have been carried out by the SNCF (French National Railways) on two designs of electromagnetic brakes acting by inducing eddy currents in the rail. The tests were made on an experimental high-speed vehicle drawn by a locomotive at speeds up to 250 km/hr. Fitted to the frame of a long- wheelbase truck, each "shoe" is approximately 2 m long and contains up to 9 poles. The mean air gap is 7 mm, and the pole faces are 78 mm wide, which is 6 mm wider than the railhead of the U80 60 kg/m rail often used for high speeds as continuously welded rail, and 13 mm wider than the more common U36 50 kg/m rail. A retarding force of 1400 daN has been obtained with the new brake at an acceptable electric power demand. Tests indicated that switch points and rail joints did not present a hazard, and that heating of the rails was slight. Remaining problems to be investigated and directions of further research are indicated.

  • Corporate Authors:

    Federation des Industries Ferroviaires

    12 rue Bixio
    75007 Paris,   France 
  • Authors:
    • Pouillet, P
  • Publication Date: 1974

Media Info

  • Pagination: p. 98-105
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125793
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Oct 18 1976 12:00AM