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Browsing by Subject "Twin Drive technology"

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    Item type:Article, Access status: Open Access ,
    Cutting investment costs by using a new solution of speed controlled belt conveyer with available medium voltage 6kV-slipring-motors
    (2007) Loose, Bernd; Paetzold, Thomas; Kroschk, Steffen
    Traditional belt conveyors with power over 400 kW in open pit coal mines are usually equipped with 6 kV slipring motors with resistors or liquid starters. The following benefits of speed-controlled belt conveyors: - saving of energy costs thanks to adjustable belt speed control, depending on the belt loading level, - reduction of mechanical wear of cable drums, gears and conveyor belts, - saving of investment costs thanks to decreasing of installed power in connection with extended loading power, - decreasing the amount of stoppages and reduction of repair costs, do not exist in case of traditional belt conveyors. The 6 kV drives, installed by BEA Technische Dienste Lausitz GmbH and Rockwell Automation in Vattenfall Europe Mining AG with existing 6 kV slipring motors, have enabled to cut investment costs significantly. After additional sensors and measure instruments were mounted and tested with 20-year-old DSRCJ 5621-6 slipring motors (produced by VEM Sachsenwerk), these motors have been feeding by PF7000 6 kV Rockwell Automation frequency converter and working (permanent operation) on the 2,5 m belt conveyor station in open pit coal mine Welzow Sud.