gearless ring motor for sag mill principles

  • SAG MILLINGGearless drive system from ABBCanadian

    WESTERN AUSTRALIAFive 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-owner of St. Ives gold mine WESTERN MINING CORP

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  • Gearless DrivesSiemens

    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

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  • Gearless mill drivesMiningWeekly

    The sixty rotor poles each weigh about 1 8 t which gives a total motor mass in excess of 400 t. The rotor poles are mounted on a flange near the feed end of the mill.

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  • Gearless mill drivesABB

    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.

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  • MONSAG A new monitoring system for measuring the load

    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 accelerated breakage of

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  • 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 (11.6 meters) and will be equipped with a 18 megawatts drive system. The 26 foot mill (8

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  • SAG Mill Grinding Circuit Design911metallurgist

    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

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  • ABB MotorGearless Mill Drive GMD SystemYouTube

    ABB Motor Gearless Mill Drive GMD System. ABB Motor Gearless Mill Drive GMD System.

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  • advantages of gearless drives on ball mills

    Ring gear drives huge grinding mill Machine Design. Following the SAG mill will be two 9 000-hp ball mills each one 20-ft in diam. and A ring gear drive offers several benefits such as simplicity low cost and ease of and a ring motor (gearless drive) either of which wraps around the mill.

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  • Ring-geared mill drivesGrinding ABB

    Mill application features. Frozen charge protectionDetects frozen charge in the mill minimizing equipment wear and liner replacements. Coupling supervisionDetects if a failure or slippage occurs in the couplings and stops the system in case preventing major damages. Stand-still detectionPrevents the motors from re-starting if the mill is still rocking or moving after a stop

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  • SAG MILLINGGearless drive system from ABBCanadian

    WESTERN AUSTRALIAFive 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-owner of St. Ives gold mine WESTERN MINING CORP

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  • INNOVATION NEWS Mills and GMDsABB

    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

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  • Gearless mill drivesMiningWeekly

    The sixty rotor poles each weigh about 1 8 t which gives a total motor mass in excess of 400 t. The rotor poles are mounted on a flange near the feed end of the mill.

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  • 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

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  • THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING

    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

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  • SIMINE Gearless mill drivesSiemens

    The gearless drive avoids any contact between the rotating mill and the static parts of the motor. This allows for contin- uous workflow without maintenance on the gears or the pinions. What used to be downtime is now productive time. Vibration-free low-weight short-circuit- proof design with high stiffness

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  • Advantages of SER drives for SAG mills GoHz

    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 pinion gears reach their present limit in size.

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  • GMD technology for Minera EscondidaMineral Processing

    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. The contract was awarded in June 2010 and equipment deliveries are

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  • Autogenous and Semi-Autogenous Mills FL

    Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28 000 kW.

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  • Commissioning Variable Speed SAG Mill Gearless Drive

    Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a 11.000 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

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  • 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

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  • Commissioning Variable Speed SAG Mill Gearless Drive

    Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a 11.000 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

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  • gearless ring motor for sag mill principlesGrinding

    gearless ring motor for sag mill principles Gearless mill drives Go gearlessABB GroupThe gearless mill drive Grinding Mill China » Learn More. SAG mill grinding processGearless mill drives systems In reducing the speed of the slip ring motor is reduced and maintenance is higher due to the ring gear.

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