The study investigates whether the braking energy expended on the projected down-grade tunnel section of the Stuttgart Stadtbahn can be economically rewon by means of a stationary flywheel storage system. A design concept was drawn up for a low-loss large flywheel store of up to 25 Mg rotating mass and the service life of forged steel flywheels investigated. The final design resulted in a system with a 5 Mg flywheel and field rheostat controlled dc motor as an electromechanical converter. Study of the energy flux ratios in the light railroad power network revealed that 680 MWh of electrical energy could be saved annually. Plant costs (without conversion) for a tested plant would amount to DM 962,000. With savings in power costs of 80,000 to DM 100,000 per year and depending on interest rates and on rates of increase in electrical current price the plant would be amortized in 12 to 22 years compared to an expected service life of more than 30 years. (ERA citation 04:030643)

  • Supplemental Notes:
    • U.S. Sales Only.
  • Corporate Authors:

    Maschinenfabrik Augsburg-Nuernberg AG

    Abt Neue Technologie
    Munich,   Germany 
  • Authors:
    • Zwerenz, W
    • Schauberger, H
  • Publication Date: 1978-11

Media Info

  • Pagination: 153 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00304078
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Files: TRIS
  • Created Date: Dec 19 1981 12:00AM