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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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Main competitors are the ring gear, as used at Escondida, and a ring motor (gearless drive), either of which wraps around the mill. ... 7,500-hp gear-driven ball mills. Another type of drive, less ...
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Presently the gearless drive is more costly than the complete mechanical portion (mill rotating element and accessories supplied by the mill manufacturers) and hence the customer/consultant needs to have two parties to deal with from the start of any project. There is an interface between the mill vendor and the gearless motor supplier.
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The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out wear on liners with ...
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The gearless mill drive (GMD) has been continuously developed since its introduction in 1969. The ... Ball Mill SAG Mill Figure 2 Core pressing system with spring plate/washer and re-tightening statistics in a typical installation Access to the …
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Significant energy and cost economies can be achieved with a gearless mill drive working with a ball mill in these upper power ranges. This prospect should …
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GMD technology for Minera Escondida. ABB gearless mill drive, installed 2002 at the Minera Escondida in Chile. ABB announced that it will supply a new 15.7 MW gearless mill drive (GMD) system for a 26 ft ball mill, including transformers, ring motor and a complete electrical room entirely equipped, to Minera Escondida/Chile.
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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.
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The gearless drive design was not applied to mills in the mining industry until the 1980s. ... the optimum flow sheet will contain a SAG mill and somewhere near the same power in …
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Concepts of Gearless Ball-Mill Drives Abstract: ... As the horsepower drive ratings required have increased to several thousand horsepower, and as advances in technologies in terms of the use and application of adjustable frequency power conversion equipment have occurred, the basis for driving the ball mill directly by the driving motor with ...
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Mill, Ball, 27' x 46', FL , 20,500 KW, Wet Grind, Unused FL Ball Mill, 27' x 46', includes 20.50 MW gearless wrap-around motor drive. Design... Add to cart.
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Concepts of Gearless Ball-Mill Drives Abstract:In the past the conventional method of driving large ball mills included some form of speed reducing gear between the higher speed driving motor and the lower speed ball mill.
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That is why the gearless drive of a grinding mill is one of the most crucial pieces of equipment in the concentrator and why it is subject to particularly high demands. Siemens has provided about 80 SIMINE Gearless mill drives to the mining …
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Current waveform at the rectifier input side of an 18 000-hp LCI SAG mill drive. (a) Rectifier input line current (800-A peak). ... R. A. Errath, " 15 000-HP gearless ball mill drive in cement ...
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Gearless Mill Drive (GMD) systems are characterized by having the motor wrapped around the mill like a ring. For this reason, they are often referred to as ring motors. The rotor poles are attached directly to the mill (head) flange, and hence the rotor becomes an integral part of the mill, as shown in figure 4.
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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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For the ball mill of A-type synchronous motor, the transmission efficiency can be improved by 15% ~ 20%, and the comprehensive power saving rate is about 17-25%, after canceling large gear and pinion. For the B-type ball mill with an asynchronous motor + reducer, the comprehensive power saving rate is up to 40%.
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ball mill manual pdf. Ball Mill Maintenance Manual Pdf - two-do.nl. Ball Mill Maintenance Manual Pdf. Page 1 this f document is bookmarked operating instructions and parts manual variable speed turret mill model jtm-4vs shown with optional accessories x-axis table powerfeed and dro walter meier manufacturing inc27 new sanford road lavergne, tennessee 37086 part …
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Whether you're talking about SAG or ball mill, space is a sensitive subject, especially in the concentrator. That's why we always design our SIMINE MILL Gearless Drives to combine maximum performance with limited space requirements. Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this notice-
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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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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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Gearless Warp Around SAG Mill. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives in the cement industry, driving tube mills with diameters of 2.5 to 4 meters with drive powers ranging from 3000 to about 5000kW.
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The SAG mill drive package is rated at 21 MW; the ball mill drives at 16.4 MW. • An order in May 2008 valued at more than €20 million from Aurox Resources Ltd. to supply gearless drives for a 34-ft-diameter, 14-MW SAG mill and a 26-ft-diameter, 17-MW ball mill for an iron ore project in Western Australia.
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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, service-friendly and fit for purpose …
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Gearless mill drives - Grinding (ABB in Mining) - ABB Group. ABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills. ...
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The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings.
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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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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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With the large‐scale development of the ball mill, the direct‐drive gearless ball mill has emerged, eliminating the limitation of the transmission torque of large gear. However, it is difficultto process, transport, install and maintain the gearless ball mill because of its vast volume, and the coils cannot be decoupled freely.
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SIMINE Gearless mill drives A standard of reliability and efficiency for grinding From Norway to Zambia, from Mongolia to Chile – for over 30 years, mining operators all over the world have been counting on SIMINE Gearless mill drives. Their most important features include a small footprint and less weight than conventional drives.
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use of big mill grinding circu its, where large power gearless motor drives w ith cycloconve rters in the range around 20 MW are being applied for semiautogenous (SAG) mills and re-
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February 28, 2011 - ABB, was awarded an over $47 million contract from Codelco for the delivery of three gearless mill drive (GMD) systems, gas-insulated switchgears (GIS), E-house and power transformers for the Ministro Hales (MH) project at 6 Kms north from Calama, Chile. The MH project brings the number of GMD orders for ABB to 100 units.
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Erection and Commissioning of the 3 largest gearless drive mills in the world, 1 40' SAG Mill and 2 28' Ball Mills, 1 60 X 113 NT Gyratory Crusher, 2 Raptor 1100 Cone Crushers, Conveyors and Filters. Erection nearing completion with pre comm already begun, hot commissioning in December with expected turn over in January 2014.
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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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The merchandise at issue is stator sections, poles and coils, and winding materials, all parts of a gearless mill drive which is apparatus specially designed to power industrial grinding machinery called ball mills. Ball mills are typically large horizontally-rotating cylinders used in the mining industry to grind pre-crushed ores into fine powder.
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Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives an overview of the basic technical data of the installed drives. TABLE I. MILLS AND THEIR DRIVES IN THE LAGUNA SECA PLANT Equipment Drive Comments SAG Mill (Semi-autogenous Grinding) Quantity : 1 unit
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