We have over 40 years of experience.

[email protected]

  1. Home
  2. Coal
  3. Gearless Ring Motor For Sag Mill Principles

Gearless Ring Motor For Sag Mill Principles

Get Solution

If you are interested in our company and our products, please contact us!

Chat Online
  • Refined and intelligent manufacturing
  • Online and offline communication
  • Tailor-made recommendation or customization
  • Special car transportation and distribution
  • Customer acceptance and commissioning
  • Comprehensive after-sales service

Get in Touch

Need more additional information or queries? We are here to help. Please fill in the form below to get in touch.

  • Gearless Drives Siemens

    Gearless Drives Siemens

    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

  • Gearless mill drives ABB

    Gearless mill drives ABB

    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 Grinding ABB

    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.

  • Increasing availability through advanced Gearless Drive

    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.

  • The Siemens 42ft gearless mill drive still an

    The Siemens 42ft gearless mill drive still an

    ing a new and larger ring motor for a Gearless Mill Drive application is that it is beyond experience. Due to cost con-sideration, building and testing a prototype is not possible. The ring motor is not self-supported and requires the mill to mount the rotor poles and needs the mill foundation to

  • gearless mill drives Archives International Mining

    gearless mill drives Archives International Mining

    Unlike more traditional ring-geared mill drives where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors GMDs 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. The necessary torque to turn the mill is transmitted between the GMD motor and the mill

  • Gearless Mill Drives Beneficiation Siemens Global

    Gearless Mill Drives Beneficiation Siemens Global

    The SIMINE Gearless mill drives pump system significantly enhances concentrator productivity by eliminating the reducer gear between motor and pump and all corresponding maintenance. In addition, the cyclone pumps with variable speed can adjust their energy consumption to the optimized flow of pulp, resulting in energy savings of up to 30.

  • gearless ring motor for sag mill principles Grinding

    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 eliminates all 28 MW GMD for 42 SAG mill wrap- ... Learn More. INNOVATION NEWS Mills and GMDs - ABB Group. Mills and GMDs Maarten van de ... around motor or ring motor is a very ... efficiency and the availability of the mill. The gearless motor is fed by a cyclo-converter

  • Increasing Availability through Advanced Gearless

    Increasing Availability through Advanced Gearless

    The Gearless Mill Drive system consists of the ring motor with its feeding cyclconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation system for mill and motor including HMI, monitoring and diagnostic system, MCCs for mill and drive auxiliaries, differential

  • Literature Review Gearless Motor Failures A Mill

    Literature Review Gearless Motor Failures A 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.

  • SAG Mill Grinding Circuit Design

    SAG Mill Grinding Circuit Design

    Jun 06, 2016 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 corresponding process flowsheet presented in

  • SAG MILLING Gearless drive system from ABB Canadian

    SAG MILLING Gearless drive system from ABB Canadian

    In December 2001, Gold Fields acquired the St. Ives project near Kalgoorlie, and only in 2003 did the new owner decide to go ahead with the project and to install the 36-ft SAG mill and its 13.5-MW gearless mill drive at St. Ives.

  • Preprint 13050

    Preprint 13050

    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.

  • Insurability of Large Gearless Mill Drives GMDs

    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.

  • Advantages of SER drives for SAG mills

    Advantages of SER drives for SAG mills

    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. Around 2MW and below, the squirrel cageVVVF drive is simple and cost effective.

  • GMD technology for Minera Escondida Mineral Processing

    GMD technology for Minera Escondida Mineral Processing

    Jul 08, 2014 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 EscondidaChile. The contract was awarded in June 2010 and equipment deliveries are scheduled for May 2011.

  • A Mechatronic Solution Design and Experience with

    A Mechatronic Solution Design and Experience with

    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

  • Sag Mill Synchronous Motors

    Sag Mill Synchronous Motors

    The poles of ... stage mill no ball mill after the SAG mill and has a diameter and length of 32, driven by a 16.5 MW GMD from ABB. TECO-Westinghouse Motor Company synchronous motors and generators provide superior value in terms of ... ball and sag mills, chippers, mixers, pulp refiners ...

  • Mill drive selection for semiautogenous grinding mills

    Mill drive selection for semiautogenous grinding mills

    mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa 5000 hp. The exception to this design was the Hibbing taconite operation. It used two4.47 MPa 6000 hp motors to drive a 1I-m-diam x 4.5-m long 36-ft-diam

  • SAG Milling in Australia Revised Submission

    SAG Milling in Australia Revised Submission

    The CCV ring motor gearless drive is used at Cadia 20 MW and Olympic Dam 18 MW. It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill

  • gearless ring motor for sag mill principles Grinding

    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.

  • Mill drive selection for semiautogenous grinding mills

    Mill drive selection for semiautogenous grinding mills

    mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa 5000 hp. The exception to this design was the Hibbing taconite operation. It used two4.47 MPa 6000 hp motors to drive a 1I-m-diam x 4.5-m long 36-ft ...

  • PDF Operation of HighPower CycloconverterFed Gearless

    PDF Operation of HighPower CycloconverterFed Gearless

    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 ...

  • Siemens Supplies Gearless Drive Systems with Frozen

    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

  • TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

    TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

    Errath, R., 2006, The Gearless Mill Drive, the Work Horse for SAG and Ball Mills, SME Conference, St. Louis. Protection and Supervision Systems for Gearless Mill Drives M Ahrens

  • Gearless mill drives Mining Weekly

    Gearless mill drives Mining Weekly

    Jun 26, 2009 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.

  • Lrs Principle Motor Starting LMPForum

    Lrs Principle Motor Starting LMPForum

    Aug 07, 2009 A very basic overview, but the advantage of wound rotor slip ring motor is that, through a LRS u can vary the resistance of the rotor. The advantages are 1. able to manipulate the torque speed curve, allowing u start with a much higher torque. Wound motors are suitable for application with heavy starting duties such as ballsag mills, crushers etc.

  • ABB commissions first gearless mill drives project in

    ABB commissions first gearless mill drives project in

    May 26, 2011 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.

  • Ring gear drives huge grinding mill Machine Design

    Ring gear drives huge grinding mill Machine Design

    Mar 01, 2000 Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that ...

  • MONSAG A new monitoring system for measuring the load

    MONSAG A new monitoring system for measuring the load

    Nov 01, 2004 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

  • Gearless Mill Drives Beneficiation Bulgaria

    Gearless Mill Drives Beneficiation Bulgaria

    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