ATLANTA, Georgia SIEMENS has added draglines to its common drive design for mobile open pit mining equipment. By providing a single drive platform for draglines, trucks and shovels, the company promises lower operating, training and maintenance costs.
With more than 140 shovels and 450 trucks operating worldwide using Siemens AC motor drives, the company considers itself an industry leader in this technology. Its AC induction motors used in mobile mining equipment provide higher stall torque, faster acceleration and higher speeds in field weakening covering a larger area under the speed/torque curve, which translates into shorter machine cycle times.
Additionally, these latest generation AC drives use the innovative water-cooled insulated gate bipolar transistor (IGBT) drive system to increase productivity. IGBT technology operates routinely at above 98% availability with mean time between failures in the thousands of hours and a mean time to repair of typically less than one hour.
The IGBT inverters, controlled by the latest SIBASTM 32S traction control, transform DC power at a constant voltage into AC power a variable frequency and voltage to drive the excavator and truck motors. Unlike DC motors, AC motors have no brushes or commutators that require maintenance. They also offer a high overload capacity and electronic protection circuits without fuses to greatly increase reliability.
Further information at: http://www.Siemens.com/mining.