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| Siemens cooperates with Komatsu for mining haul trucks  The Siemens Group Industrial Solutions and Services and Komatsu Ltd., Tokyo, Japan, announce the formation of an alliance to jointly develop electric drive systems for mining haul trucks. Komatsu is the worldwide market leader for diesel-electric haul trucks in open pit mines. Compared to mechanical drive, the advanced technology in Siemens drive system provides higher productivity, reduced maintenance and lower operating costs.AC electricity is generated on the truck by an alternator connected to the main diesel engine. This AC voltage is rectified into DC voltage and briefly stored. The Siemens IGBT (insulated gate bipolar transistor) inverters transform this voltage back into fine-tuned AC power that drives the electric wheel motors at the back of the truck. With the optimized voltage and frequency control of the AC power, speed is controlled with the accelerator pedal just like in a normal car. In addition to low operating costs, the benefits of the Siemens drive system include the capability to provide very high torque at stand still for acceleration of the truck in the severe application, high top speed, and high electrical braking capabilities. Using the electric wheel motors to slow the truck reduces mechanical brake wear and also lowers operating costs. write your comments about the article :: © 2006 Construction News :: home page |