advantages of gearless drives on ball mills
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- advantages of gearless drives on ball mills
Siemens' gearless drive technology of 99.46 to 99.71% - as confirmed by real operational data from the Antapaccay mine in Peru. It was the first plant worldwide to use gearless drives for both applications. KEYWORDS Gearless Mill Drives, Gearless Conveyor Drives, Availability, SAG Mill, Ball Mill, Overland Conveyor, Antapaccay 15
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Cobre Panama is using six ABB Gearless Mill Drives (GMDs) at its recently commissioned copper concentrator in Panama. Two 28-megawatt (MW) GMDs are operating on the 40-ft SAG mills, and four 16.5-MW GMDs are employed on 26-ft …
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The $1.2 billion expansion, which saw throughput rise from 60,000 t/d to 120,000 t/d, involved the addition of two new thyssenkrupp-made ball mills, with ABB providing the gearless mill drives (GMD) technology. This came on top of the 33 mills the miner already had up and running as part of the existing 60,000 t/d plant at the operation.
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For drive capacities of such mills to around 18 MW, mostly conventional (RMD) rim mill drives are used, for higher powers to 28 MW gearless mill drives (GMD) are used. The advantages of such GMD solutions compared with the RMD solution are multiplied with the mill size.
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Eleven 5MW gearless drives with synchronous motors running at low speeds (50-60rpm) drive three conveyors; two with four motors each and one with three. Two 20MW conveyors transport the ore from the open pit operation to the surface, overcoming an elevation change of around 1,300m, while the second conveyor feeds into a slightly smaller, 15MW ...
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TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS . · speed motors connected to two pinions and driving a ring gear or a gearless motor mounted directly onto the mill. In addition a gearbox can be used to reduce the speed of a high speed motor. ... Concepts of Gearless Ball-Mill Drives IEEE Journals ...
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Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust ...
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Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions. Due to the variable speed operation the grinding process can be optimized for
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2 GEARLESS MILL DES The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto the mill, the mill itself becomes the …
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Two 28 MW gearless mill drive systems (GMDS) are operating in the mine's 12-metre SAG mills and four 16.5 MW GMDS are employed in 26 ball mills along with associated control systems. "Gearless mill drives are the 'workhorses' for grinding operations which are at the heart of any mine.
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Specific areas of responsibility include but not be limited to, maintenance of the primary gyratory crusher, connecting conveyor belts, secondary pebble crushers, a 40' gearless motor drive SAG Mill, two Ball mills, all equipment in the concentrator, and downstream to the tailings area, pumps and pipelines.
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what is lrs in ball mill - verhuur-doms.be. Advantages of SER drives for SAG mills Friday, December 19, 2014 For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cyclo-converter) is typically used because gearboxes and pinion ...
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Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but only one in North America (St. Lawrence Cement). Recently both Afton and Lornex in British Columbia installed variable speed dc drives on wet ...
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Gearless mill drive. The limitation of an RMD system was overcome by ABB when it introduced the first gearless mill drive (GMD) in 1969 for the cement industry. ABB introduced the first GMD into the minerals industry in 1985 and since then it has become the de facto standard equipment for mines with larger throughput requirements.
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26ft Ball Mills of 16.4 MW commissioned in 2011. In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently being erected or are in fabrication phase. Los Bronces suffered a Frozen Charge in their expansion plant Confluencia on 10th September 2012 at its Ball Mill No. 2.
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ABB announces that it has successfully completed the commissioning of a 13.4 MW gearless mill drive (GMD) system for the Hipogeno project. ... Chile´s Minera Los Pelambres Ltda. is operating a new SAG mill and a new ball mill equipped with gearless drives systems by Siemens. ... the JAWMAX 200 ® also offers all the advantages of SBM's mobile ...
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For gearless drives, motor torque output at the maximum desired operating mill speed and ball charge volume has to be determined. Primary Mills: Torque Output (by Motor) vs Torque Demand (by Mill) For the purposes of this discussion, "drive speed" refers to the output speed of any mill drive system, whereas that of
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The gearless drive design was not applied to mills in the mining industry until the 1980s. The reasons for application of this technology …
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Gearless Mill Drive Sales Rev Up to Meet Demand … to drive large SAG and ball mills. … a separate inching drive to position the mill for liner … always been a …
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Advantages of SER drives for SAG mills GoHz Dec 19 2014 · So at say 85 speed 15 of the motor rated power is returned from the rotor to the supply At a hyper synchronous speed the SER drive feeds power into the motor rotor allowing it to run faster than synchronous speed So for a fixed torque and higher speed the power obtained from the motor is higher than the motor …
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A technical evaluation comparing the advantages and disadvantages of each drive is presented. Download to read the full article text References. Blauenstein, E., ... Von Musil, R., 1976, "State of Development of Gearless Drives for Ball Mills," Siemens Review, March. Wurgler, H.V., 1970, "The World's First Gearless Mill Drive," IEEE ...
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Gearless Ball Mill Images polrecreatienl gearless ball mill images MTM Crusher Heavy engineering article vr steel range from 12 m diameter 55 kW ball mills to 122m diameter first SAGball mill completed was a 4 m x 14 m dry AG mill » Learn More Get Price New advantages of gearless drives on ball mill. Gearless drive systems for belt conveyor ...
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Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions.
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Grinding mill drives play an important role in the mining industry. ... significant advantages in terms of productivity and efficiency ... R. A. Errath, " 15 000-HP gearless ball mill drive in ...
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Errath, R., 2006, "The Gearless Mill Drive, the Work Horse for SAG and Ball Mills", SME Conference, St. Louis. Protection and Supervision Systems for Gearless Mill Drives M Ahrens
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The gearless design for drive systems – first used in a mill in 1969 and then a belt conveyor ... Gearless drives also offer an energy-efficiency advantage. ... a 29 MW drive for the 40-foot SAG mill and two 22 MW drives for the 28-foot ball mills. Get Price.
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ABB announces that it has successfully completed the commissioning of a 13.4 MW gearless mill drive (GMD) system for the Hipogeno project. ... Chile´s Minera Los Pelambres Ltda. is operating a new SAG mill and a new ball mill equipped with gearless drives systems by Siemens. ... the JAWMAX 200 ® also offers all the advantages of SBM's mobile ...
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ABB was recently contracted to supply gearless mill drives (GMDs) for six ball mills and twin-drive systems for eight high pressure grinding rolls (HPGRs) at the Cerro Verde copper mine in Peru Archive > Equipment
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SIMINE Gearless mill drives are essential pieces of equipment for the concentrator plant, contributing to the outstanding plant availability of around 95%. SIMINE Gearless mill drives furthermore help reduce the total costs and assure a high performance. Watch video Slide 2 of 2 Sentinel copper mine Zambia Supporting ambitious copper output goals
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Gearless mill drives Gearless mill drives (GMD) for semiautogenous (SAG), ball and autogenous (AG) mills eliminate the typical mechanical components of the drive train (shaft, gearbox, pinion and ring gear). In 1969, ABB delivered the first GMD ever, which is still in operation today. The upper limit of the power range today is about 35 MW.
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The Los Bronces SAG mill drive is rated at 22 MW and the ball mill drives at 16.4 MW. • A €20-million order on December 10, 2008 from Compania Aurifera Brisas del Cuyuni C.A., a subsidiary of Gold Reserve Inc., for gearless mill drives for two 36-ft-diameter SAG mills at the Brisas gold-copper project in Venezuela.
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