Jun 06, 2016 Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having been designed. Several circuits have single-line design capacities exceeding 100,000 TPD. A large SAG installation (with pebble crusher product combining with SAG discharge and feeding screens) is depicted here below, with the ...
Nov 07, 2021 The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)
The paper specifically describes SAG mills, but the equations and principles apply equally to any conventional tumbling mill, such as AG, ball or rod mills. MOTOR ELECTRO-MECHANICAL CHARACTERISTICS The cost of a motor of a Gearless Mill Drive depends mainly on two parameters Diameter of the motor, Rated Torque of the motor, The ...
answered. Depending on the mill size and type, the mill can be driven by several configurations of drive systems. The main options are single low speed motors connected to a pinion driving a ring gear, two low speed motors connected to two pinions and driving a ring gear, or a gearless motor mounted directly onto the mill. In addition, a gearbox
Aug 28, 2010 Siemens expands mining portfolio to include gearless drive system for 42-foot SAG mills. Siemens is now able to provide to mining companies a gearless drive system for SAG mills with a tube diameter of 42 feet. This enables throughput to be almost doubled in comparison with the 38-foot mills commonly used today.
Sep 15, 2006 For the two ore-grinding mills, Siemens is supplying gearless ring motor drive systems supplied with power via cycloconverters. The SAG mill has a diameter of 38 feet (11.6 meters) and will be equipped with a 18 megawatts drive system. The 26 foot mill (8 meters) will have a drive output of 16 megawatts.
The CCV ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill
Sag Mill Synchronous Motors. Geared VS Gearless Drive Solutions for Grinding Mills , Ore Crushers / sag mill synchronous motors 38 x 24 , motor and large gear which driven by low speed. ... livers variable frequency to the Ring Motor of the gearless drive, , corporating low speed motors, driving mills via a , girth gear This solution comes up ...
Figure 6 Full vacuum pressure impregnation for windings. Figure 4 Ring-geared mill drive solutions. Figure 5 Gearless mill drive solution. Throughout the comminution process, different mills are driven. Get Price sag mill gearless drive gautengcc.co.za. Utah, SAG mill and a 11,200 kW gearless drive for the El Teniente, Chile, SAG mill.
Gearless mill drives Go gearless The gearless mill drive eliminates all mechanical components of a conven- tional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and ... Getriebelose Mhlenantriebe (GMD) von ABB - YouTube 4 Nov 2011 ...
1 CONGA THE WORLDS FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL T. Orser1, V. Svalbonas 2 and *M. Van de Vijfeijken 3 1Newmont Mining Corporation 10101 East Dry Creek Road Englewood, CO 80112, USA 2Metso Corp. 2715 Pleasant Valley Rd.
40 ft (12.2 m) diameter 20 MW Cadia gearless SAG mill, .... Gear/pinion drives of this size are unknown as the physical size of the ... in the production program (e.g., failure of rolls at ..... Ring motors are very flexible, and mill operations can be. Get Price
Mill application features. Frozen charge protection Detects frozen charge in the mill, minimizing equipment wear and liner replacements. Coupling supervision Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages. Stand-still detection Prevents the motors from re-starting if the mill is still rocking or moving after a
Jul 30, 2013 Zurich, Switzerland, July 30, 2013. ABB, the leading power and automation technology group, announced today the acquisition of Alstoms ring motor business to enhance its gearless mill drive ...
May 26, 2011 The contract for the system, consisting of ring motor, transformers and E-house including the new powerful ABB cycloconverter controller AC
ABB buys ring motor business to boost its gearless mill. Jul 30, , ABB is buying Alstoms ring motor business to enhance its gearless mill drive , The GMD system also needs less maintenance and typically offers , Raw material from the crushing stage is typically fed to SAG, AG (autogenous) and ball mills for further processing to , Rotation for life plan guarantees that.
Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in
method of driving SAG mills, Ball mills and other rotating elements. Several thousand grinding mills have been manufactured and have been in operation for the last century. The gearless drive came into the minerals industry in 1980 and as per their reference lists, Siemens have approximately 60 installations and ABB have approximately 85.
Jul 08, 2014 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.
Mar 26, 2007 In March 2006, Siemens IS received an order from Equinox for the engineering, design, manufacture and supply of two mill drive systems. With the Simine Mill GD (gearless drive) gearless ring-motor drive systems, the speed of the SAG and ball Mills can be varied with the help of the transvector control principle.
Oct 22, 2015 When mill power is between 18 and 20 MW, which is the current manufacturing limit of ring geared mills 2, either a gearless mill drive (GMD) or a ring geared mill with dual pinion motors can be chosen. Selecting between gearless or ring geared design is mostly dependent on size of the mill and power and speed requirements 3.
Gearless Mill Drives_3BHT 490 275 R. Gearless mill drives Go gearless efficiency and the ability to mine in remote areas are making low ore grades economically feasible to grind these days with higher installed power ratings relative to the mill diameter the mill itself becomes the rotor of the gearless.
mill startup and allows features like fro-zen charge protection, controlled roll back and positioning for mill mainte-nance needs. Figure 6 Full vacuum pressure impregnation for windings. Figure 4 Ring-geared mill drive solutions. Figure 5 Gearless mill drive solution. Throughout the comminution process, different mills are driven
The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.
Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABBs 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 ...
GEARLESS DRIVES FOR GRINDING MILLS 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.
Section II presents the working principles and opera-tional characteristics of a drive for SAG mills, Section III ... data of a typical Gearless synchronous
May 14, 2021 Gearless mill drives (GMDs) constitute a compelling alternative to traditional ring-geared mill drives (RMDs) in such environments. Both drive types can be used to power large semi-autogenous (SAG), ball and autogenous mills, but GMDs are proven to offer superior availability, uptime and efficiency. Change Management and Operational Readiness.
We have written on risk associated with large ring motors in gearless mill drives previously 1 2 3 . In 1 we observed that ABB and Polysius were far too confident in 2001 when they claimed that 42 and 44 ft diameter mills and ring motors posed only manageable risks and that a 44 ft mill and GMD design was ready and waiting for a purchaser 4 .
Ring-motor-driven SAG mills in copper mines have shown frequent malfunctions in the past 3, 6, 7. The problem is owed to the characteristics of
Dec 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
Grinding and processing. WEG offers the most reliable and efficient solutions for milling plants for ferrous and non-ferrous products with their experience of mill drive systems. In the heart of a processing plant, the ball and SAG mills must be driven by solutions that adapt to the characteristics of the minerals in line with the whole process.
1983 Conceptual study and pilot plant test work for the first 36 ft dia. SAG Mill with a GMD (Gearless mill drive, or ring motor) at 15,000 hp and commissioned in 1991. 1986 Development and successful implementation of a Bond Work Index-based methodology for estimating power requirements for SAG milling and secondary Ball milling.
Jun 26, 2009 Gearless mill drives 26th June 2009 GMDs are used on the larger ball and semi-autogenous grinding (SAG) mills, where power transfer through the con- ventional gearbox, pinion and girth gear ...
Hammer mill principle pdf. hammer mill components, operating principles, types, us hammer mill is the most widely used grinding mill and among the oldest hammer mills consist of a series of hammers usually four or more hinged on a central shaft and enclosed within a rigid metal.
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