• Number :

    0086-21-58386256

  • Address :

    Pudong new district, Shanghai, China.

gearless ring motor for sag mill principles

Sag Mill Drives Girth Gears At 18 000 Hp Motors

sag mill pinion drive uslugibudowlanebrzozowka.pl. The discharge end of the mill; For the operator this only becomes a problem should thesag mill drives girth gears at 18000 hpThe largest ringmotor- driven mill in the world is a 36-ft diam. 16 000-hp SAG mill that ABB ring geared mill drives YouTube Jun 05 2013· We provide optimized mill drive solutions for all types of ring-geared millsget price

Increasing availability through advanced Gearless …

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.

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.

sag mill motor complete stator - alrom.fr

The four motors are gearless mill drives (GMDs), also known as wrap-around motors, and include two 26MW ball mill motors and two 28MW SAG mill motors. Among the challenges on this project were the remote location of the mine, which is located approximately 400km north-east of Kitwe, and working during a heavy rainy season while also trying to ...

The Siemens 42ft gearless mill drive, still an ...

• Motor behavior during normal operation with a loaded mill The result is the design of a Gearless Mill Drive motor for a 42ft Grinding Mill providing up to 35MW of power. Evolution is still the main GMD design philosophy, but realistic and proven computer models help to look beyond experience, where testing is impossible.

Grinding Circuit - an overview | ScienceDirect Topics

The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out wear on liners with ...

gear less mill drive motor working princeple

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 ...

CMP Paper 16.10.09 Final

The gearless mill drive is covering the upper power range of the mills. The torque is transmitted to the mill directly through the magnetic field in the air gap of the motor, eliminating the gear reducer, the ring-gear and the mechanical related issues faced by maintenance with ring-geared mills.

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)

First new trolley assist truck system for many years ...

In March 2006, Siemens I&S received an order from Equinox for the engineering, design, manufacture and supply of two mill drive systems. With the Simine Mill GD (gearless drive) gearless ring-motor drive systems, the speed of the SAG and ball Mills can be varied with the help of the transvector control principle.

SAG Mill Variable Speed Drive - 911 Metallurgist

Gearless or ring motor drives; Twin CCV or Cycloconverter; Twin ICI or Load Commutated Inverters using variable frequency; Quadramatic II LCI drive. For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a …

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 …

Sag Mill Operating Principles

sag mill operating principles - parsana. gearless ring motor for sag mill principles - accgroup, filling of a SAG mill is presented The operating principle is based on the, gearless drive for a SAG mill, The mill is of the ring-motor type . Chat Now TECHNICAL AND COMMERCIAL BENEFITS OF, Get a Price.

Gearless mill drives - Grinding | ABB

Gearless mill drive system (GMD) 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 ...

Rotary Ball Mill Motors maintenance

SIMINE MILL The Gearless Drive avoids any contact between the rotating mill and the ... motors, Siemens offers a minimum-weight, short-circuit-proof design featuring ... quickly set up mill maintenance procedures without endangering the safety of the staff. ... Whether SAG or Ball Mill, space is a sensitive subject, especially in the con-.

SAG Mill Grinding Circuit Design - 911metallurgist.com

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 ...

Vibrations On A Gearless Mill Motor

Vibrations On A Gearless Mill Motor - bediva.in. Vibrations On A Gearless Mill Motor. Frozen Charge Detection And Automatic Loosening With Gearless Mill . gearless mill drive, gmd, frozen charge, backed charge, frozen charge protection, frozen charge shaker, grinding mill introduction until the trip shuts of the motor and lets the mill oscillate. the torque value is constantly growing and the ...

Increasing Availability through Advanced Gearless Drive ...

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, MCC's (for mill and drive auxiliaries), differential

Double Helical Gear - an overview | ScienceDirect Topics

A gearless drive SAG mill, 12 m diameter and 6.1 m length (belly inside liners) with a motor power of more than 20 MW, went into operation at Newcrest Mining's Cadia Hill gold and copper mine in Australia, with a throughput of over 2,000 t h −1 (Dunne et al., 2001). Motor designs capable of 35 MW have been reported (van de Vijfeijken, 2010).

gearless mill drives Archives - International Mining

Gearless mill drives (GMDs) are the grinding solution of choice in challenging environments. By eliminating bolt-on mechanical components such as ring-gears, pinions, couplings and gearboxes, GMDs offer ore producers unrivalled availability, efficiency and durability, while reducing operating expenditure, according to GMD provider ABB.

LAKE COWAL|EMF

Lake Cowal is a gold mine in NSW operated under Evolution Mining. EMF has recently completed cleaning and inspecting the Ball and SAG mill gearless drive motors. This involves entering the motors through inspection hatches and meticulously brushing and vacuuming the internal windings along with a thorough inspection of the insulation, slip ring ...

Gearless Warp Around SAG Mill - 911metallurgist.com

Gearless Warp Around SAG Mill. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives …

THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING A …

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 ...

ABB acquires ring motor business from Alstom - MINING.COM

Zurich, Switzerland, July 30, 2013. ABB, the leading power and automation technology group, announced today the acquisition of Alstom's ring …

largest gear driven sag mill - aire-de-jeux-king-leo.fr

The mill will be driven by a Gearless Motor Drive (GMD) which, at 28.0MW, is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec's proprietary grinding mill technology, developed over decades for maximum reliability and performance.

SAG MILLING - Gearless drive system from ABB - Canadian ...

SAG MILLING – Gearless drive system from ABB. WESTERN AUSTRALIA - Five 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 ...

motores molino sag siemens - salamoonlight.es

gearless ring motor for sag mill principles. Acquired experience in motor maintenance on 18MW 38feet wrap around/Gearless Mill motors for Sag, and a ring motor (gearless, the wraparound principle or . sag mill motors rbritiin gearless sag …

Siemens Supplies Gearless Drive Systems with 'Frozen ...

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 …

Literature Review: Gearless Motor Failures – A Mill ...

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].

, Ring motor with 2 separated stator windings [22 ...

Download scientific diagram |, Ring motor with 2 separated stator windings [22]. from publication: Current issues on high-power cycloconverter - Fed gearless motor drives for grinding mills ...

GEARS & DRIVES IRevival of the GMD in cement

Figure 3: fitting of rotor poles on a large SAG Mill Figure 2: three-phase synchronous ring motor (wrap around motor) Figure 1: the new gearless mill drive for cement comes in two segments Figure 4: operating principle of a cyclo converter: the motor voltage is generated directly from the supply voltage

Various Parts Of Ball Mill In Pdf-HN Mining Machinery ...

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.

ABB acquires ring motor business from Alstom - PACE

The gearless motor – also called wrap-around motor or ring motor – is a very large synchronous machine which uses power electronics and a magnetic field to control the speed of the motor rotation. With no mechanical interaction between the stationary and rotating parts, there is a significant reduction in the amount of energy used, fewer ...

sag mill motor complete stator - annakoperska.pl

SAG mill and two 26 ft ball mills, all made by The drive systems that enable the mills to operate at benchmark levels of reliability, efficiency and availability were made by ABB, whose solution comprises a 235 MW gearless mill drive (GMD) for the SAG mill, and two 13 MW low-speed dual-pinion ring-geared mill drive (RMD) systems for the,

Integrated drive technology from Siemens enhances ...

In future, two gearless mill drives and Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill. Thus, one million tons of copper concentrate, 10 000 tons of molybdenum and four million ounces of silver oxide can be mined annually – even at an altitude of around 4600 m above mean sea level.

Making remote mines and low ore grades economical and ...

The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four 16.5 MW GMDS are employed …

Sag Mill Trunnion Cracks - ssi-distribution.co.za

Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by the power that a … Read More

Operation of High Power Cycloconverter-Fed Gearless Drives ...

Section II presents the working principles and opera-tional characteristics of a drive for SAG mills, Section III ... data of a typical Gearless synchronous motor used in SAG mills. The machine ...

GMD technology for Minera Escondida - Mineral Processing

GMD technology for Minera Escondida. ABB gearless mill drive, installed 2002 at the Minera Escondida in Chile. 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.

Join Our Newsletter