gearless ring motor for sag mill principles

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Gearless mill drives

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 drives Archives

Gearless mill drives GMDs are the grinding solution of choice in challenging environments By eliminating bolt-on mechanical components such as ring-gears pinions couplings and gearboxes GMDs offer ore producers unrivalled availability efficiency and durability while reducing operating expenditure according to GMD provider ABB...

When it Comes to Mining Bigger is Best

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...

Mill grinding

SAG mill 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...

INN O VATI O N

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...

sag mill ring gear failure

40 ft 122 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 eg failure of rolls at Ring motors are very flexible and mill operations can be Get Price...

ball mill batu gold ore diy

Gold Ore Ball Mill Dijual Di India sag mill drive dijual - post cher gearless ring motor for sag mill principl 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 type of grinding mill purposed similarly to the...

Pablo Astudillo

HighService feb de 2008 - jun de 20124 años 5 mes Santiago Ring Motors specialist Member of company s service center to support GD s customers -by technical assitance contracted services- in solving GD s operation problems in field for diagnostic system fault Assistance in Codelco Chuquicamata Minera Candelaria Codelco Andina Codelco...

Our History as Comminution Consultants

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...

ABB commissions first gearless mill drives project in

May 26 2011 0183 32 The contract for the system consisting of ring motor transformers and E-house including the new powerful ABB cycloconverter controller AC 800PEC was awarded in June 2007...

Siemens Supplies Gearless Drive Systems with Frozen

Sep 15 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 The 26 foot mill 8...

Siemens expands mining portfolio to include gearless drive

Aug 28 2010 0183 32 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...

Jurgen Groth

New factory people ABB Ring Motors Recomendado por Jurgen Groth GEARLESS SAG AND BALL MILLS GEARLESS SAG AND BALL MILLS Common Operational Errors 1 Tripping on High Temperatures Heat Exchanger Should be Inspected on this one 2 Recomendado por Jurgen Groth Let us reminisce a little and look back to the year 1873 This...

Ring gear drives huge grinding mill Machine Design

Mar 01 2000 0183 32 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...

ABB to supply gearless mill drives in Kazakhstan

May 28 2012 0183 32 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...

Gearless Mill Drives Beneficiation Siemens Global

Sep 20 2021 0183 32 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...

When it Comes to Mining Bigger is Best PTE

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...

MONSAG A new monitoring system for measuring the load

Nov 01 2004 0183 32 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 semiautogenous grinding SAG...

ABB to supply three large GMDs for Mauritanian gold mine

Mar 08 2011 0183 32 ABB s scope of supply consists of three complete GMD systems including transformers 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 In addition Kinross ordered the new ABB GAP-Watch for each...

GMD technology for Minera Escondida

Jul 08 2014 0183 32 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 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...

PDF Operation of High

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 the cycloconverter that feeds the synchronous...

Commissioning Variable Speed SAG Mill Gearless Drive

Gearless Mill Drives Beneficiation Siemens Global...

An electrical impact study between variable speed dual

Oct 22 2015 0183 32 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...

A CA

A new division providing industry-leading services for gearless mill drives Newly integrated into s robust service portfolio A CA is a team of electromechanical and electrical experts that provide 24/7 remote and on-site services for gearless drive systems...

Gearless mill drive system in iron ore 173 processing

Jul 08 2014 0183 32 Gearless mill drive system in iron ore 173 processing ABB was recently contracted to supply gearless mill drive GMD systems for two 38 foot semiautogenous grinding SAG mills at the Serra Azul iron ore mine in Brazil The Serra Azul mine unit owned by MMX Mineração e 173 Metálicos an EBX Group company is located in the iron quadrangle of...

GEARLESS DRIVE

Nov 07 2007 0183 32 The ABB order includes a complete 19-MW gearless mill drive system for a 115-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...

gearless mill drive

01127204_2jpg 10723 kB Two 186MW GMD systems for 27-foot ball mills at Esperanza copper mine Chile 01126974_2jpg 8605 kB 224MW GMD system for a 40-foot semi-autogenous SAG mill at Esperanza copper mine Chile 01127262_2jpg 9462 kB GMD at Esperanza copper mine Antofagasta Chile 01126997_2...

Underwear Mills In China

Underwear Mills In China 2018-6-12 China Zhejiang Datang Socks Group CoLtd was established in year 2000 Headquarters is located in the west industrial one...

belt specifications conveyor

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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...

CMP Paper 161009 Final

The gearless mill drive is covering the upper power range of the mills The torque is transmitted to the mill directly through the magnetic field in the air gap of the motor eliminating the gear reducer the ring-gear and the mechanical related issues faced by maintenance with ring-geared mills...

Sag Mill Synchronous Motors

ball mill 40 poles motor drawing Description Conga The world39s first 42foot diameter 28 MW gearless SAG mill SAG mill 40 ft 42 ft gearless mill drive GMD SAG Get Price Ball Mill Motors And Protection Rock Crusher And Mine sme grinding mill motors the SAG mill motor has 72 poles and the ball mill motors have 56 pol GE Motors has...

Gearless Warp Around SAG Mill

Nov 11 2018 0183 32 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...

Preprint 13

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...

gearless drives interface for drives in cement plantspdf

View Notes - gearless drives interface for drives in cement plantspdf from CEMENT MAN 109 at IIT Kanpur SME Annual Meeting Feb 25-Feb 28 2007 Denver...

Mining Weekly

Jun 26 2009 0183 32 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-...

Best Ball Mill Installation Design

Autogenous mills semi-autogenous mills and ball mills for wet Plant supply Our organisation is designed to handle system Ball mill with COMBIFLEX be driven via ring gear pinion drives or the SAG/ball mill circuit incorporating supply or turn-key to best tailor the is...

SAG Mill Grinding Circuit Design

Jun 06 2016 0183 32 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...

sag mill wrap around motor

Mills and GMDs International Mining Oct 2010 823 kB - ABB gearless motor is then wrapped around the mill With this innovative concept the gearless mill drive GMD stage mill no ball mill after the SAG mill and...