TEN YEARS OF THREE-PHASE AC DRIVE TECHNOLOGY IN PUBLIC TRANSPORTATION SYSTEMS

Three-phase drives with modern power and control electronics have now been in service in public transportation systems for ten years, a mark in time which makes it appropriate to analyse the progress achieved in both technology and application. Focal points, such as traction motors, drive assemblies, static converters, electronic regulating and monitoring equipment, and the question of compatibility are discussed in connection with the possibilities offered by the new technology. The effects on coach building and power supply infractures are examined under the aspect of future goals.