At Ruhr-University Bochum a new automatic underground mixed-cargo transportation system 'Cargo Cap' is under development. The electric drive consists of two wheel-sets with individual wheels, driven by four induction motors, each pair fed in parallel by one inverter, for redundancy reasons. A robust speed-sensorless control using a Real-Time x86-based controller has been suggested. But when negotiating curves with small diameters considerable speed differences of the parallel fed motors occur, much bigger than known from conventional parallel operation of two wheel-sets in a bogie, making the speed estimation system doubtful. An improved structure needing only one current sensor in addition to the two commonly built into the inverter unit is under investigation, to maintain the stability of the speed estimation. The adaptations and amendments in the control and simulation software obtained are described. Now the real behaviour of the system can be easily modeled and simulated.
Development and adaptation of a traction inverter control software to operate with minimum number of sensors
Entwicklung und Anpassung einer Steuer-Software für Traktions-Inverter mit einem Minimum an Sensorik
2006
8 Seiten, 10 Bilder, 2 Tabellen, 9 Quellen
Conference paper
Storage medium
English