• Gearless mill drives Grinding ABB

    Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose

  • ABB ring geared mill drives YouTube

    Jun 05, 2013· ABB ring geared mill drives composite liners Rubber Liner for SAG MILL BALL Luna WU 6,934 views. 1:04. Starting a 6kV 3Ph 2,200 kW 1,000 rpm slip-ring motor for a cement ball mill

  • Author: ABB
  • Gearless Mill Drives Beneficiation Siemens Global

    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)

  • Sentinel: Siemens Gearless Mill Drives YouTube

    Jan 19, 2016· The mills at Sentinel in Zambia are amongst the world’s biggest, with 2 off 40 ft SAG mills complete with 28 MW drives, and 2 off 28 foot-ball mills with 22 MW drives. For mines of this size

  • Author: Siemens
  • Gearless Drives static.dc.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

  • Sag Mill Drives Girth Gears At 18000 Hp

    Gearless Ring Motor For Sag Mill Principles. Ring gear drives huge grinding mill Machine Design. 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 processes up to 2 000 tons of ore per hour. Get Price. Get

  • Gearless Warp Around SAG Mill

    Gearless Warp Around SAG Mill. Previous Next. View Larger Image; 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 with diameters of 2.5 to 4 meters with drive powers ranging from 3000 to about 5000kW.

  • Ring gear drives huge grinding mill Machine Design

    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

  • 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].

  • Gearless mill drives ABB Group

    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.

  • 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].

  • Gearless mill drives ABB Group

    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.

  • Ring gear drives huge grinding mill Machine Design

    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

  • Increasing Availability through Advanced Gearless Drive

    The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in Fig. 1. Figure 1 Top view of SAG-Mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor What’s the benefit?

  • Revolutionary Drive Controller for Gearless Mills

    Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to about 6 Hz.

  • SAG Mill Variable Speed Drive

    Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but only one in North America (St. Lawrence Cement).

  • gearless ring motor for sag mill principles

    gearless ring motor for sag mill principles. Chapter 93. Construction ilocis . Chapter 93. Construction HEALTH AND SAFETY HAZARDS IN THE CONSTRUCTION INDUSTRY. James L. Weeks. Construction workers build,

  • Mill (grinding) Wikipedia

    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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

  • GMD infographic final ABB Group

    Gearless mill drives Go gearless 28MW 10 million cell phones 1701 Residential houses/day Today’s GMDs can reach a height of 21.7m (71ft). This equals the total combined height of more than 12 people one on top of the other. By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor which is

  • Ring-geared mill drives Grinding ABB

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

  • 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.

  • Grinding mills for mining and minerals processing Metso

    Every mining operation has a unique grinding process. Metso has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

  • Used Sag Mills for sale. Hardinge equipment & more Machinio

    18′ X 30′ OUTOTEC SAG MILL. Manufacturer: Outotec Size: 5.5 m dia. X 9.15 m EGL 4500 kW WEG wound rotor motor 1000 RPM, 11,000 volt, 3 phase, 50 Hz 2 Piece welded steel shell Cast steel feed and discharge heads Alloy steel liners Hydrostatic multi pad trun...

  • Gearless mill drive system in iron ore ­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 ­Metálicos, an EBX Group company, is located in the iron quadrangle of Minas Gerais, next to Belo Horizonte the heart of

  • 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.

  • Grinding mills for mining and minerals processing Metso

    Every mining operation has a unique grinding process. Metso has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

  • Used Sag Mills for sale. Hardinge equipment & more Machinio

    18′ X 30′ OUTOTEC SAG MILL. Manufacturer: Outotec Size: 5.5 m dia. X 9.15 m EGL 4500 kW WEG wound rotor motor 1000 RPM, 11,000 volt, 3 phase, 50 Hz 2 Piece welded steel shell Cast steel feed and discharge heads Alloy steel liners Hydrostatic multi pad trun...

  • Gearless mill drive system in iron ore ­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 ­Metálicos, an EBX Group company, is located in the iron quadrangle of Minas Gerais, next to Belo Horizonte the heart of

  • Preprint 13-050 ceecthefuture

    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.

  • SIMINE Gearless mill drives Siemens

    SIMINE Gearless mill drives outstanding reliability for your mine The gearless concept 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

  • A Mechatronic Solution Design and Experience with Large

    between motor and mill clock and counterclockwise rotation of the mill The main area of application of gearless drives is the high power low speed range, where an extremely smooth operation, also at minimum speed is required combined with outstanding control characteristics for an optimized process. • • • • • • • • The gearless

  • ABB to deliver three large gearless mill drives for

    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 20.5 megawatt GMD systems will be installed to drive two 27-foot diameter ball mills.

  • Current issues on high-power cycloconverter Fed gearless

    Current issues on high-power cycloconverter Fed gearless motor drives for grinding mills Conference Paper (PDF Available) · July 2003 with 926 Reads How we measure 'reads'

  • Mining Grinding and Processing WEG

    Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.

  • Gearless Mill Drives Beneficiation Siemens Bulgaria

    Frozen charge detection and automatic loosening with gearless mill drives (SAG Conf. 2015) Mill drives: the desire for increased power and the associated limits and conditions (SAG Conf. 2015) The engineering and process effects of choosing a motor design speed (SAG Conf. 2015)

  • Electrolytic starter (LRS) for high power slipring motors

    EPM electrolytic starter can be used to start slipring motors from 500 kW to 20,000 kW. It will supply the power necessary to drive the motor by resistance variation. Smooth progressive acceleration. Wide range of applications. Rugged and reliable. Customised for each application. Reduced maintenance. Download the product sheet.

  • 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.

  • MONSAG: A new monitoring system for measuring the load

    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