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
Mining industry | Market-specific Solutions | Siemens
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
SAG is an acronym for semi-autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor
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)
Giant ABB drive systems boost mining productivity Orders for ABB gearless mill drives – giant motor and drive systems that enable mines to grind vast amounts of minerals and ore - are at record levels as the mining industry seeks to boost production to meet the global boom in demand
ABB to deliver three large gearless mill drives for ,
ABB to deliver three large gearless mill drives for Mauritanian gold mine project , ring motors and E-house One 26 megawatt GMD system will be installed for a 40-foot diameter SAG mill, while two 205 megawatt GMD systems will be installed to drive two 27-foot diameter ball mills .
gearless ring motor for sag mill principles – Grinding ,
gearless ring motor for sag mill principles Gearless mill drives Go gearless - ABB GroupThe gearless mill drive , Grinding Mill China , » Learn More SAG mill grinding process - Gearless mill drives systems , In reducing the speed of the slip ring motor, , is reduced and maintenance is higher due to the ring gear
Siemens Supplies Gearless Drive Systems with 'Frozen ,
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 (116 meters) and will be equipped with a 18 megawatts drive system The 26 foot mill (8 ,
Increasing Availability through Advanced Gearless Drive ,
The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in Fig 1 Figure 1 – Top view of SAG-Mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor What’s the benefit?
Preprint 13-050 UPDATES ON GEARED VS GEARLESS DRIVE SOLUTIONS FOR GRINDING MILLS R Kalra, CITIC-HIC Pty Ltd, Sydney, NSW, , Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive , interface between the mill vendor and the gearless motor supplier
Increasing availability through advanced Gearless Drive ,
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
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 .
Gearless mill drive system in iron ore processing ,
ABB’s scope of supply includes two GMD systems for 38 foot 23 mw SAG mills (Fig) comprising transformers, ring motors and complete containerized electrical houses (e-houses) The variable speed drive solution allows for optimization of the grinding processes for ores with varying properties and different mill loads
Sep 10, 2014· Gearless motors up to 22 MW are in service in many of these ore processing plants Gearless motor drives are also known as "ring motors" or "wrap around motors" The motor consists of a large number of magnets placed circumferentially on the shell of the grinding mill This is similar to the rotor of a conventional motor
Current Issues on High-Power Cycloconverter - fed Gearless ,
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-
A Mechatronic Solution Design and Experience with Large ,
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
Gearless Mill Drive Sales Rev Up to Meet Demand By Russell A Carter, Managing Editor , • A contract valued at more than $13 million from General Moly Inc for a 13-MW gearless mill drive system for a 36-ft SAG mill The order is for General Moly Inc’s Mount Hope molybdenum development project in Nevada, USA
Sag mill drive dijual postcatcher gearless ring motor for sag mill principles sag mill dual pinion geared drive gear drive sag mill vs gearless drive sag mill gold ore crusher 20 ton ball mill untuk dijual dijual mesin grinding fluid energy ball mill is a
Gearless mill drives Go gearless The gearless mill drive eliminates all mechanical components of a conven , The stator of the SAG mill gearless drive at Cadia Hill Gold Mine exhibited , have recently supplied their largest grinding mill braking system to , ring motor (Gearless Mill Drive) and it is due to this development .
Jun 05, 2013· We provide optimized mill drive solutions for all types of ring-geared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and .
Commissioning Variable Speed SAG Mill Gearless Drive
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 ,
ABB to deliver three large gearless mill drives for ,
ABB’s scope of supply consists of three complete GMD systems including transformers, ring motors and E-house One 26 MW GMD system will be installed for a 40′ diameter SAG mill, while two 205 MW GMD systems will be installed to drive two 27′ diameter ball mills In addition, Kinross ordered the new ABB GAP-Watch TM for each system GAP .
Sep 28, 2014· Introduction We have written on risk associated with large ring motors in gearless mill drives previously [1, 2, 3] In , 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 
Dec 19, 2014· Advantages of SER drives for SAG mills , 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 gears reach their present limit in size Around 2MW and below .
list of 40 foot sag mills worldwide AS a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing plant
The behavior of the cycloconverter fed gearless drive ,
motors (2 x 68 MW) for the two ball mills and a 12 MW gearless drive for the SAG mill with its filter circuits A 14 MVA load and its compensation of 2 x 2 Mvar can represent the low-voltage loads In this plant, short-circuit currents appeared in the gearless drive when the electrical power company disconnected the external supply