gearless ring motor for sag mill principles

  • 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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  • 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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  • 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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  • Gearless Mill DriveYouTube

    Jan 25 2017 · .

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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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  • starting current gearless mill drive

    Gearless mill drives Grinding ABB. 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.

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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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  • 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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  • 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

    Read More
  • Mining WeeklyGearless mill drives

    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- ventional gearbox pinion and girth gear

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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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  • Gearless Mill Drives Beneficiation Österreich

    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)

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  • Insurability of Large Gearless Mill Drives (GMDs)

    Sep 28 2014 · 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 .

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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 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 DriveYouTube

    Jan 25 2017 · .

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  • 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.

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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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  • 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

    Read More
  • 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

    Read More
  • 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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  • 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

    Read More
  • 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.

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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

    Read More
  • ABB MotorGearless Mill Drive GMD SystemYouTube

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

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  • 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.

    Read More
  • 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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  • gearless mill drives ArchivesInternational Mining

    Unlike more traditional ring-geared mill driveswhere a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motorsGMDs 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.

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  • (PDF) Technical Evaluation and Practical Experience of

    Gearless motor for a high-power mill. fi ring angle in the recti In SAG mills in the air gap between rotor and stator is affected whereas for HPGR mills is the operational gap in both

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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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  • Gearless Mill DriveYouTube

    Jan 25 2017 · .

    Read More
  • 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

    Read More
  • 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

    Read More
  • 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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  • 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

    Read More
  • 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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