BelAZ-75710, the world’s largest mining two-axle all-wheel-drive rear-dump truck with weight-carrying capacity of 450 t demonstrated the performance worth of an entry in the Guinness Book of Records. The new vehicle rolled out of the BelAZ plant in late 2013 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.
As opposed to its predecessors, the new truck is provided with 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 Nürnberg. The project was completed in a comparatively short term: the development process from ordering to commissioning took less than two years.
Siemens has been developing drive systems for mining trucks for many years. Currently, the company supplies BelAZ OJSC with AC traction electric drives for 240 t and 360 t trucks.
BELAZ-75710 is the first vehicle in the class of super-high-load trucks having a weight-carrying capacity of 450 t. It is over 20 m long, nearly 10 m wide and 8 m high. The turning diameter is about 20 m. Siemens says “the truck has embodied the latest technological solutions ensuring its high efficiency, reliability, manoeuvrability and smooth running as well as the driver’s comfort and safety. 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 mines of Chile and North America. The first truck is due to set off to one of the open mines of Kuzbass coalfield.
