autogenous grinding (SAG) mills, or ball mills. The most important components of a GMD are the following ones The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names wrap-around motor and ring motor (see Figure 1). Its purpose is to
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 ...
plied gearless drives for two 36-foot ring motors, de-veloping a 12,000 kW gearless drive for the Kennecott, Utah, SAG mill and a 11,200 kW gearless drive for the El Teniente, Chile, SAG mill. In a continued call for larger, even more powerful drives, Siemens kept pace. In 1996, Freeport ordered the first gearless drive for a 38-foot SAG mill ...
Feb 02, 2005 SAG MILLING Gearless drive system from ABB. WESTERN AUSTRALIA - Five years in storage have failed to affect the performance of the ABB gearless drive on a SAG mill at the St. Ives gold mine belonging to GOLD FIELDS of South Africa. The mill was originally ordered in May 1997, but shortly before the manufacturing was completed, the then ...
Unlike more traditional ring-geared mill drives where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors GMDs work by mounting rotor poles directly to the mill body and surrounding it with the stator ring, meaning the mill itself is incorporated into the motor.
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 ...
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.
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
View Notes - gearless drives interface for drives in cement plants.pdf from CEMENT MAN 109 at IIT Kanpur. SME Annual Meeting Feb. 25-Feb. 28, 2007, Denver, CO Preprint 07-024 TECHNICAL AND COMMERCIAL
Mar 01, 2000 Ring gear drives huge grinding mill. March 1, 2000. By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and ...
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.
Sag Mill Synchronous Motors. large synchronous motor. The poles of ... stage mill (no ball mill after the SAG mill) and has a diameter and length of 32, driven by a 16.5 MW GMD from ABB. TECO-Westinghouse Motor Company synchronous motors and generators provide superior value in terms of ... ball and sag mills, chippers, mixers, pulp refiners ...
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.
For example, ring-geared mill drive (RMD) systems are good solutions when the power required to drive the mill is under 18 MW, i.e., a maximum of 9 MW per pinion (Fig. 4). Yet as tube mills grow in size in order to meet the demand for larger throughputs, the
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 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.
Sep 10, 2014 The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel 8.
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.
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
Today, 40 ft. diameter SAG mills and 30 ft. diameter ball mills, both with motor powers of more than 22 MW, are commonplace as mine operators look for even larger equipment to achieve greater economy of scale. Mills with these larger drive capacities are driven exclusively by a wrap around ring motor (gearless mill drive).
May 28, 2012 ABB will supply one 28 megawatt GMD for a 40-foot semiautogenous (SAG) mill and two 22 megawatt GMDs for two 28-foot ball mills. May 28, 2012 - ABB won an order worth $44 million to deliver three gearless mill drive systems (GMDs) for a new copper mine to be operated by Kazakhmys PLC (Kazakhmys) in southeastern Kazakhstan.
Nov 01, 2004 1.. IntroductionLower ore grades, variable grindability, mineral handling and economics state a challenge for current mining operations. Looking for economies of scale, new mining projects consider big mill grinding circuits, with large power gearless motor drives (GMD) fed by cycloconverters in the range around 20 MW (Sams et al., 2001).Gearless Drives for
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
Nov 07, 2007 The ABB order includes a complete 19-MW, gearless mill drive system for a 11.5-metre SAG mill. The contract includes engineering and delivery, which is scheduled for the end of 2008. The system will include a ring motor, transformer, housings and a new ABB cyclo-converter controller, AC 800PE.
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Aug 02, 2013 The gearless motor also called wrap-around motor or ring motor is a very large synchronous machine which uses power electronics and a magnetic field to control the speed of the motor rotation. With no mechanical interaction between the stationary and rotating parts, there is a significant reduction in the amount of energy used, fewer ...
how to align ball mill pinion to drive motor the main fixed speed drives for SAG and ball mills are slip ring motors how to align ball mill pinion to ... ball mill drive ... ball mill, ring gear, dual pinion, drive ... calculation of mill power draw and selection of appropriate drive... cost picture for these gearless drives making ...
Horizontal mills for the cement industry - Siemens. Horizontal mills, almost exclusively ball mills, are widely used in ... Cement ball mill drive system options ... rotor AC induction motor with a slip ring that provides.
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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 ...
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.
Nov 01, 2004 Fig. 1 depicts a gearless mil drive, where the mechanical power is transferred electromagnetically between the stator and poles of the rotor (Errath et al., 2003).Due to the mass flow, materials, and power involved in the process, SAG mills face the problem of high-energy impacts caused by steel balls cataracting against the shell of the mill, with loss of energy and
May 26, 2011 The contract for the system, consisting of ring motor, transformers and E-house including the new powerful ABB cycloconverter controller AC
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.