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As nicely as brake them. This is no imply feat, because the vehicles weigh about 200t each about the same as 130 mid variety cars. As soon as the trucks are fully loaded, the drives require to transfer up to 600t through sand, mud, and deep holes, as well as over steep hills. Electrical energy, not Diesel. A 3,000hp diesel motor generates the current. So why doesn't it just propel the truck as well? "The reason is easy. It's just not worth putting the motor and gears of a car on to the slopes of a mine. A gearbox potent enough to deal beats by dre studio pas cher with the workload needed of these trucks would be enormous, and would also require a lot of maintenance," states Kllner, explaining the disadvantages of purely mechanical propulsion. Not only do the trucks dispense with gearboxes. Many thanks to their electrical drive systems, they also do without clutches and brake disks in normal procedure. Electrical resistors are utilized casque beats pas cher to brake the vehicles, and pace can be steplessly modified via 3 phase current frequency. "This kind of trucks are essentially driven like a car with an automatic gearbox," states Kllner, who is an engineer and has really driven 1 of the behemoths. For more than thirty years now, Siemens has been using three stage present drives for mining vehicles. "The rotating electrical field can be transformed straight into mechanical rotation," states Kllner. Some producers, on the other hand, still prefer DC generate methods. In such motors, nevertheless, the present has to be continuously interrupted and re engaged to generate a rotational movement. This limits the revolutions per moment that a motor of this type can attain. And it nike talon requires much more components that require to be maintained frequently. "Our alteating current motors can provide up to 7 percent more overall performance from the exact same amount of power, and downtimes for maintenance and restore work are rare," says Kllner. "Generally, just one technology check a year is all that is needed." Large Trucks, Zero Emissions. AC drives also form the foundation for a improvement from Siemens that can significantly speed up the transport of mining nike à talon products: trolley trucks. This kind of vehicles function like streetcars sporting antler like pantographs that can be elevated and lowered at the press of a button. This means that the driver can hyperlink the truck to overhead conductors (catenaries), which are usually set up on steep slopes. "This is where standard vehicles, regardless of their 3,000 plus hp, can only advance at a snail's pace," says Kllner. The catenaries can offer the generate methods with almost 6,000 hp. This means that the truck's pace can almost double, and the mine operators can decrease the number of costly mechanical giants they need to have on website. The atmosphere casque beats studio pas cher benefits from trolley technology too. There are no local emissions, because the diesel motor switches itself off automatically when contact is produced with the overhead line. What's more, the braking energy that

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