Updates on geared vs gearless drive solutions for grinding mills. Running costs ... Among the many reasons that geared drives on large SAG mills ... twin pinion drives used primitive electronics which have since been .... The actual concrete foundations for geared (Fig 13 & 14) and ..... Krupp. Polysius AG, Beckum/Germany. 3.

The type of drive and drive design used on a given mill, especially with respect to the motor type, is directly influenced by the study of the owner's electrical system. Manufacturing limitations from gear vendors determine the …

SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

World's largest geared drive – 2x8500kW – Wushan, China (operating) Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive option (60 to 80% critical speed), which is required for process reasons.

measured at the shaft which drives the pinion gear in a gear-and-pinion drive. Apart from in pilot-scale ... Gearless drives (also known as wrap-around motors) are quite different to gear-and-pinion drives. ... Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in ...

Case of copper mountain the voltage level for the mill drive systems war raised to 25 kv variable speed it is a well accepted fact that sag mills do require variable speed drives but the same can not be said for ball mills therefore this was not a must have on the target feature lists for the ball mill drives. View Details

which for a Gearless Mill Drive is simply ⌽ RPM ÷ 60. For a gear driven mill, the motor speed is a function of the mill speed ⌽ RPM, and the gear ratio of the mill bull gear and the drive pinion. Case study No 1: Changing pinion on a fixed speed mill A …

Gearless mill drives - ABB • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive ...

Project. Verico's online condition monitoring and reporting system is used for automated detection and reporting of faults in gearless and low-speed gear drives such as SAG (semi-autogenous grinding) mills and HPGR (high pressure grinding rolls) drives. It combines traditional condition monitoring reporting with a continuous, automated online ...

Sag Mill Recirculating Load Rate Protable Plant » gear drive sag mill vs gearless drive sag mill » ball mill and sag mill liner manufacturer gauteng jhb » calculation of recirculation load on a single stage sag mill

SAG Mill Variable Speed Drive. Jul 18, 2018· This drive train has been well proven over many years of service as a fixed speed drive and offers major benefits over any other arrangement. As mill size increased above approximately 4,476 kW (6,000 hp), the limits of gear technology were reached and it . largest grinding mills

Concrete madness - foundations of SAG Mill gearless drive A gearless drive will require about 250% more concrete and more importantly more reinforcing steel in the foundations than the equivalent dual pinion drive = $$$$$$$$$$$$$$$$$$ This picture shows only what is …

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 …

Geared VS Gearless Drive Solutions for Grinding Mills, Ore Crushers / sag mill synchronous motors 38' x 24, motor and large gear which driven by low speed. ... with three ABB low-speed dual-pinion mill drive, a crusher mill driven by a ring gear and one or more.

ABB. Aug. 2012–Apr. 20196 Jahre 9 Monate. Baden-Dättwil. Based in Switzerland, global responsible for the entire product life-cycle management (including R&D) of Drive Systems for Grinding applications in the Product Group Mining, Aluminium and Cement. The portfolio includes Gearless Mill Drives (GMD), Ring-geared Mill Drives (RMD) and High ...

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 ...

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.

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 located at the company's Grasberg plant in …

Vfd Dimensioning High Altitude. Apr 14 2020 medium voltage vfds operate there successfully driving large sag and ball mills pumps conveyors or fans figure 4 gearless mill drive gmd courtesy of abb figure 4 shows a typical gearless mill drive gmd featuring so called ring motor introduced in 1969 by abb the rotor poles are fixed directly to the mill shell and the stator is

The SAG mill is followed by two 20-ft diam., 7,500-hp gear-driven ball mills. Another type of drive, less commonly used, consists of a motor-driven speed reducer that is coupled to one of two ...

The gearless design for drive systems – first used in a mill in 1969 and then a belt conveyor ... Gearless drives also offer an energy-efficiency advantage. ... a 29 MW drive for the 40-foot SAG mill and two 22 MW drives for the 28-foot ball mills. Get Price.

Mill system analysis is just as important, if not more important, for gear driven mills than for gearless driven mills. The aim of the two analyses is different. For one mill type, the aim is to stop the foundation from vibrating or deflecting excessively, For the other mill type, the aim is to prevent the ring motor from doing so.

for cylindrical grinding mills. It will act as a checklist for information required, outline the impact of certain selections, and resolve ambiguities to address the two problems outlined above. Background A grinding mill circuit is an unusual in-stallation for gearing when compared to traditional enclosed gear drive in-

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 …

Minerals Industries, Inc. 240 Arch Street, P.O. Box 15312 York, Pennsylvania, USA 17405-7312 Phone: + 1 717 843 8671 Fax: +1 717 845 5154 E-mail: mineralsprocessing.info@ Gearless Autogenous/ Semi-Autogenous Mills

SAG mills . Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, is the world leading supplier of gearless SAG mills operating globally.ball mill drives maldivedelsudsalento.

Page 2. ABSTRACT. The size of mills driven by ring-gear or by a gearless solution has significantly increased in the . protecting it from network transients and faults. Get Price; Overview on the grinding mills and their dual pinion mill drives. SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed .. to problems on the ...

SAG mills - Outotec. Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Outotec …

When mill diameter and mill power became again increased, only the Gearless Mill Drive (GMD) could be envisaged to cover this requirement above 10 MW. The GMD is by its nature a variable speed drive system. Process operators, once having the facility of adjustable speed, could not live anymore without it for SAG mills.

And within that total number is included a number of industry firsts. I would highlight the world's first gearless drive for a SAG mill in 1988 at Chuquicamata and the first 40 ft mill GMD at Cadia in 1998 and the first GMDs at …