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 …

The $1.2 billion expansion, which saw throughput rise from 60,000 t/d to 120,000 t/d, involved the addition of two new thyssenkrupp-made ball mills, with ABB providing the gearless mill drives (GMD) technology. This …

Gearless Mill Drive Protection Improvements and Its Behavior at Minera Escondida Ltda. Luis Nieto C. Gerencia Mantenimiento Procesos Minera Escondida Ltda, MEL ... Picture of the Ball Mills at the Laguna Seca Concentrator The first GMD with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le Havre in

A gearless mill drive (GMD) is industrial equipment that is used to transmit power from a motor to a ball mill or other rotating machinery without using gears. The motor is directly connected to the mill through a coupling. This allows the motor to transfer its power directly to the mill.. Gearless mill drives are used in a variety of sectors: mining, construction, …

Meanwhile, Siemens' Industry Solutions Division reported it had received an order from Compañia Minera Antamina S.A. to supply gearless drive systems for a SAG mill and ball mill at the Antamina open-pit in Peru. Siemens said the award is worth approximately €20 million ($26.1 million) and is scheduled for completion in late 2010.

Summary. September 1, 2010 - ABB won an order from Newmont Mining Corporation to engineer three gearless mill drive (GMD) systems to be installed at the Yanacocha Minas Conga oxide copper gold project in Peru. Fluor Corporation in Santiago, Chile, will act as EPCM contractor for this important project; Corporation will be the mill supplier.

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The first large gearless ball-mill in North America has been successfully installed at the Mississauga, Ontario, plant of the St. Lawrence Cement Company. The motor rating is 8750 hp (6500 kW) at 14.5 r/min (4.84 Hz). The electrical aspects considered of interest are discussed in the paper.

Gearless Mill Drive Protection Improvements and Its Behaviour at Minera Escondida Ltda ... In ball mill 2, the over-voltage arrester modules failed and the dissipating resistances were connected during the operation of the mill. This situation was not detected by the current circulation sensors in the over-voltage arrester modules and the ...

The gearless ball mill drive can be designed in two basic arrangements. Fig. 8.13. shows an arrangement with the motor rotor supported by a strengthened and extended mill trunnion shaft and bearing. This arrangement retains maximum accessibility to both mill and motor. Fig. 8.14. shows a wrap-around construction with the motor rotor supported ...

Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD). This solution was designed to control, stabilize and ...

Significant energy and cost economies can be achieved with a gearless mill drive working with a ball mill in these upper power ranges. This prospect should also be of interest to the cement industry. The technology is available for an up-sizing of cement grinding installations and the gearless mill drive is a proven, reliable drive.

Ball mill driven with gearless mill drive Abstract: This paper introduces how PT Semen Bosowa/Indonesia considered the installation of a cement plant gearless mill drive, the criteria for the selection of the gearless mill drive versus traditional solutions, the technology developed for this particular application and the conclusion drawn from ...

26ft Ball Mills of 16.4 MW commissioned in 2011. In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently being erected or are in fabrication phase. Los Bronces suffered a Frozen Charge in their expansion plant Confluencia on 10th September 2012 at its Ball Mill No. 2.

As was mentioned above, a gearless mill drive constitutes both an important part, but also one of the most critical elements of a concentrator or a cement plant. Their purpose is to ensure the continuous rotation of specific types of tumbling mills, more specifically autogenous grinding (AG) mills, semi-autogenous grinding (SAG) mills, or ball ...

Revamp and Modernization of Gearless Mill Drives. Technical and Commercial Benefits of Gearless Mill Drives for Grinding Applications. ABB's Gearless mill drive system is the …

Technologies for extraction and processing, including gearless mill drives (GMDs) and gearless conveyor drives (GCDs), help operators save energy and achieve greater throughput at large mills with higher grinding capacities. When big data is also applied, this lowers costs using preventive and predictive maintenance.

the days of the first gearless mills of the '80s, and thru the first 40 ft mills, extensive fabrication kick-off meetings were held, where all processes were discussed. Perhaps because this has become familiar, such is ... Ball Mill External Weld Design Cadia 6.7m 37.8 MPa 14 years Conga 7.26m 38 MPa * - Toromocho 7.82m 51.4 MPa * -

Our solution: SIMINE Gearless mill drives – outstanding reliability for your mine. The gearless concept. The gearless drive avoids any contact between the rotating mill and …

Concepts of Gearless Ball-Mill Drives Abstract: In the past the conventional method of driving large ball mills included some form of speed reducing gear between the higher …

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ABSTRACT. This paper presents modifications made to the motor design and concentrates on those points that have reduced, simplified and shortened the motor maintenance …

general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.

Typical types of mill used in ore beneficiation are autogenous (AG) and semi-autogenous (SAG) mills together with ball mills to, for example, obtain particle sizes smaller than 100 µm. ... (RMD) rim mill drives are used, for higher powers to 28 MW gearless mill drives (GMD) are used. The advantages of such GMD solutions compared with the RMD ...

Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives an overview of the basic technical data of the installed drives. TABLE I. MILLS AND THEIR DRIVES IN THE LAGUNA SECA PLANT Equipment Drive Comments SAG Mill (Semi-autogenous Grinding) Quantity : 1 unit

Each of the four lines will consist of a single 40 ft SAG mill with a 28 MW drive and two 28 ft ball mills, each with a 22 MW drive. ... All drives are Gearless Motor Drives from ABB. Each line will also include an FL cone crusher solution with state of the art digitalisation and control system. The first production line will be delivered ...

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 in 26 foot ball mills along with associated control systems. The six ABB Gearless Mill Drives have been installed since late last year and are all now in continuous operation; ABB team at Mina de Cobre in …

Antamina Compania Minera Antamina S.A. Peru Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant: Bechtel, USA Mill Builder: FFE Minerals, USA Mill Size: SAG Mill 38 feet/11,58 m Ball Mills 24 feet/7,32 m Ore processed: Copper/Zinc Drive Rating: SAG Mill 20,1 MW, 9,23 rpm Ball Mills …

Larger ball and SAG mills, with higher installed power ratings relative to the mill diameter, offer higher efficiency and throughput, round-the-clock reliability and the opportunity to mine in remote areas. ... Two 28 MW …

In the past the conventional method of driving large ball mills included some form of speed reducing gear between the higher speed driving motor and the lower speed ball mill. Process developments in the mining and cement industries have increasingly tended toward the use of ever larger ball mills for grinding their products. As the horsepower drive …