Mining Gets a Really Big Wheel

BelAZ-75710, the world's largest, mining, two-axle, all-wheel-drive, dump truck with weight-carrying capacity of 450 metric tons, has demonstrated a performance worth of an entry in the Guinness Book of World Records. The new vehicle rolled out of the BelAZ plant in late 2013, and is being field tested as the biggest machine of its class with a record-breaking capacity.

To suit the needs of the gigantic haul truck, Siemens developed a unique ac traction drive system, MMT500. The system is comprised of four 1,200-kW electric motors, two traction generators, three blowers, a brake resistor unit and a control cabinet with two ELFA inverters.

The new dumper has eight wheels, each designed for about 100 tons of load. Therefore, Siemens traction division experts chose to develop a reliable and powerful all-wheel drive train with four electrical machines. The use of the all-wheel gear has opened up new possibilities of distributing tractive effort to both axles. Further, in case of failure of one of the driving gears, an emergency mode can be activated, which would enable the dumper to get to the service station without being towed. The traction motors for the electric gear were manufactured at Siemens facilities in Nuremberg. The project was completed from ordering to commissioning in less than two years.

BELAZ-75710 is the first vehicle in the class of super-high-load trucks having a weight-carrying capacity of 450 tons. It is over 20 meters long, nearly 10 meters wide and eight meters high. The turning diameter is about 20 meters. The vehicle maximum speed is 64 km/h. BelAZ-75710 is in high demand in the mines of Kuzbass region of the Russian Federation, and in certain coal strip mines of Chile and in North America. The first dump truck is due to set off for one of the open mines of Kuzbass coal field.

Currently, Siemens also supplies BelAZ OJSC with ac traction electric drives for 240-ton and 360-ton dump trucks.

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