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...
Current issues on high-power cycloconverter - Fed gearless motor drives for grinding mills , Ring motor with 2 , In the mining industry multipulse cycloconverters are used to feed high power ....
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 ....
he gearless motor also called wrap-around motor or ring motor is a very large synchronous motor The poles of the motor are directly installed on a pole flange on the mill shell this means the mill body becomes the rotor The stator of the gearless motor is then wrapped around the mill With this innovative concept the gearless mill drive ....
Semi-Autogenous SAG grinding is the size reduction of material in a tumbling mill utilizing the feed material plus supplemental grinding media The most common supplementary medium is steel balls Gearless drives ringmotors have been used on tumbling mills for several decad The design features motor rotor elements bolted to a mill shell ....
The scope of supply for the Phoenix gearless mill drive with a rating of 18 000 HP 1305 Megawatts includes the pre-fabricated sub-stations equipped with the cyclo-converters, the transformers as well as the ring motors The so-called Roebel Bar-windings, a technology developed by ABB, deserve special mention in connection with the supply...
gearless drive mills and crushers gearless ball mill imag inspection checklist for crusher a ball mill, and a SAG mill, for example mills with a direct drive or gearless drive, Read Now Mining NonFerrous CITICHeavy Industries Co Ltd CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector price...
As a trusted mining partner, SIMINE solutions help customers to meet their challenges and thereby enable to set new benchmarks within the mining industry To boost efficiency and reduce costs, we rely on our solutions for mine hoists, bulk material handling, gearless and conventional mills as well as mining-specific automation and power solutions...
tive optimization of the mill systems The engineering complexities increased because the gearless drive could no longer be de-signed according to the stress principles alone but also incorporated stiffness prin-ciples as well Stiffness criteria should be defined and exchanged between the motor supplier, the mill manufacturer and civil...
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 With this innovation, Siemens is responding to the rising demand for larger and more powerful drives in mining...
ABB announced that it will supply a new 157 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 The contract was awarded in June 2010 and ,...
use of big mill grinding circuits, where large power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous SAG mills and re-...
Mar 14, 2006 0183 32 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 116 meters and will be equipped with a 18 megawatts drive system...
When it Comes to Mining, Bigger is Best Gearless mill drives may be the key to maintaining throughput Venkat Nadipuram One of the key challenges in the mining industry today is maintaining throughput in the face of ore grade quality that has declined by 40 percent in the last decade...
ABB recently won an order worth 44 million US to deliver three gearless mill drive systems GMDs for a new copper mine to be operated by Kazakhmys PLC Kazakhmys in southeastern Kazakhstan , SAG mill and two 22 megawatt GMDs for two 28-foot ball mills Each GMD system includes phase and excitation transformers, a ring motor with its ....
Ring-motor drives were first used in cement industry mills and later in mining industry applications The largest ringmotor- driven mill in the world is a 36-ft diam, 16,000-hp SAG mill that ....
use of big mill grinding circuits, where large power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous SAG mills and re-cently, ball mills are also being considered This work addresses some current issues involving design and application of high-power drives employed in SAG grind-...
Ball Mills as secondary grinding stage The Electric Drive SIEMENS consists a 11000 HP synchronous motor of variable speed General Description of the Drive The SAG Mill Drive is mainly formed by a 11,000 HP Ring Type Synchronous Motor of double winding, fed ,...
Operation of High Power Cycloconverter-Fed Gearless Drives under Abnormal Conditions , data of a typical Gearless synchronous motor used in SAG mills The machine operates with reduced speed ....
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...
ABB commissions first gearless mill drives project in Canada International Mining , SAG mill at the Canadian Malartic gold mine Engineering, delivery and commissioning of the complete 19 MW ....
Sep 28, 2014 0183 32 Introduction 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...
Figure 3 fitting of rotor poles on a large SAG Mill Figure 2 three-phase synchronous ring motor wrap around motor Figure 1 the new gearless mill drive for cement comes in two segments Figure 4 operating principle of a cyclo converter the motor voltage is generated directly from the supply voltage...
PONTT et al OPERATION OF HIGH-POWER CCV-FED GEARLESS DRIVES UNDER ABNORMAL CONDITIONS 815 Fig 2 Power circuit of synchronous motor with two stator windings that are fed by a 12-pulse CCV TABLE I PARAMETERS OF ATYPICAL SYNCHRONOUSMOTOR FOR ASAG MILL APPLICATION Fig 3 Waveform of voltages and currents in the stator at steady state...
Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the ,...
Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor...
Gearless AG/SAG mills With the proven use of gearless drive technology, the limitation of AG/SAG mill size due to gearing constraints has been eliminated is the world s leading supplier of gearless AG/SAG mills gt gt Chat Online ABB ring geared mill drives - YouTube...
For grinding of the ore, an SAG Semi Autogenous Grinding mill and a ball mill will be used 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 116 meters and will be equipped with a 18 megawatts drive system...
SAG mill, ball mill, and crusher A ball mill is a slightly inclined, horizon- , Gearless mill drive The limitation of an RMD system was overcome by ABB when it introduced the first gear- , quired during the ring motor lifetime GMD condition monitoring ABB...
slip ring induction motor for sag mills » gearless sag mill slip ring motor » what is the difference between a sag mill and ball mill » ball mill and Contact Supplier what are ring motors for sag mills Kinetics Industries, Inc of slip rings and brushes on motor start resulting in an open field circuit, motor protection trip 45...
Experienced technicians guidance is available on the phone, and on the internet. One or more engineers will be dispatched to the quarry site to help install the customers’ plants. Necessary training about machine daily maintenance to local workers is provided also.
