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gearless ring motor for sag mill principles

  • 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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  • (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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  • Literature Review Gearless Motor FailuresA Mill

    Sep 10 2014 · The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel 8 .

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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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  • 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 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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 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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  • 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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  • 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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  • Literature Review Gearless Motor FailuresA Mill

    Sep 10 2014 · The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel 8 .

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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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  • 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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  • 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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  • Gearless Mill DriveYouTube

    Jan 25 2017 · .

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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.

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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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  • 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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  • 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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  • 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 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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  • 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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  • Gearless Mill DriveYouTube

    Jan 25 2017 · .

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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

    Chat Now
  • ABB MotorGearless Mill Drive GMD SystemYouTube

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

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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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