MOTORS AND DRIVES solutions designed to meet the rigorous requirements of the mining, mineral extraction and processing industries at MINExpo 2016.“ Eaton’ s advancements help safeguard against unexpected work interruptions to provide critical performance within harsh environments,” said Dave Durocher, Global Segment Manager, Eaton.“ Eaton helps fuel continuous improvement, provides continuity in operations, and keeps people and equipment safe. Our robust portfolio drives energy-efficiency, maximises uptime, and increases productivity at every stage of mining, from exploration to processing, whether underground or on the surface... Eaton’ s globally certified components offer the added value of a single platform, enabling cost-effective operation over the total lifecycle of the product.”
During MINExpo, the Eaton offering on show included its industry-leading power distribution technology designed to enhance safety, including Eaton’ s FlashGard ® arc-resistant Motor Control Centres( MCCs), " the first solution to combine arc-preventative and arc-resistant technology within a single motor control centre. The solution is designed to emphasise prevention, insulation and isolation to support safety during routine maintenance operations.” Also included were Eaton’ s SC9000™ medium-voltage adjustable frequency drives originally designed for harsh mining environments, which now include the industry’ s first type tested arc-resistant drive technology.
Underground drive solutions
Expanding its portfolio of electrification, automation and digitalisation solutions for the mining industry, Siemens has introduced a new drive system for underground mining vehicles,“ providing a dedicated power range and performance for higher levels of productivity, safety and return on investment.”
The high-efficiency electric drive system includes Siemens robust and proven propulsion and auxiliary inverters, established control hardand software as well as optional energy storage solutions. At the heart of Siemens’ drive train is the high-efficiency PEM Motor typically connected to the wheels with a planetary type gearbox. This PEM motor, which is suitable for difficult mining conditions, achieves a higher efficiency of up to 97 % in operating-speed range compared to the efficiency of standard induction motors of similar size. With these components working together, the haul truck’ s braking energy can be intelligently harnessed and stored for electric propulsion.
“ To mine raw material, which is situated much deeper below the surface, the current trend is shifting from surface mining to underground mining, thus requiring market-specific solutions that not only ensure a high yield of return on
investment, but also ensure added safety for the health of miners,” says Daniel Robertson, Business Manager, Mobile Mining, Siemens.“ Our new powertrain offers a greater power to ground ratio, thus providing higher haul truck productivity to transport more tonnes raw material per energy unit,” says Robertson.
“ By shifting from a pure diesel-mechanic to a diesel-electric configuration, mine owners and operators can significantly reduce mine ventilation costs, often the biggest expense for underground mines. This also increases access to adjacent orebodies that may not have been feasible before. The conversion from pure diesel trucks to diesel electric trucks should be considered as a necessary precursor to apply fully electric vehicles
in underground mining in the not so far future.”
The new drive system is currently in development on a 60 t articulated underground haul truck application, yet more than 1,000 mining-duty powertrain systems are deployed globally in the open pit mining market which includes all-electric excavators and various haul truck applications.
“ As many UG vehicles have similar power and propulsion requirements, Siemens plans to expand its development activities for other loading and transport applications in underground mining.”
The new Caterpillar HTD4100 High Torque Drive System for longwall armoured face conveyors " enables a higher level of automation for enhanced speed and torque control and real-
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NOVEMBER 2016 | International Mining 55