Gearless mill drives. Longer service intervals thanks to low-wear drive processes SIMINE Gearless mill drives' rpms can be tailored to your operations at any time, and are infinitely variable and uncomplicated. Whether manually or fully automatic – rpms can be adjusted to account for the proper-ties of the ore, resulting in significantly less

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 ...

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 ...

Due to the huge volume of gearless ball mill direct drive permanent magnet synchronous machine (PMSM), an unwinding modular technology is convenient for its redundant power control, manufacture and maintenance. Several module units are wrapped around the ball mill roller for direct drive. The motor frame adopts a modular structure …

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 ...

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

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

We have rearranged the drive architecture in order to apply high powered transmission to large grinding mills in the mining industry. Full scale test bench To fully develop the QdX4TM Mill Drive solution, a full scale instrumented test bench was designed and constructed to test the QdX4TM Mill Drive torque dividing system under the ...

The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation sys …

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.

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 …

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 …

The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le Havre in France. In the first few years, the GMD was only used in the cement industry. The GMD is also known as "wrap-around motor" or "ringmotor".

that available through the gearless drive system. Consequently, the dividing line that separates gear driven grinding mills from gearless type mills is becoming ... Two secondary ac synchronized motor coupled to a gear mill, $2.5 million ball mills, 18x27 drive with an air clutch. motor, $602,000 6050 F Ptimary SAG, 34x16 Ringmotor …

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 …

next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual design approach considering, on the one hand, the experi-ences Siemens made with Gearless Mill Drive (GMD) instal-lations over the past 40 years and, on the other hand, using computerized design tools calculating the system behavior where experience does not yet exist.

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 …

Over recent years, there has been a clear trend toward higher capacity cement production units. Five to ten years ago 2500 tons per day was large. Nowadays in Asia, lines are built for 10000 tons per day. The development of ball mill grinding units has not shown the same trend; output and ratings have remained more or less constant perhaps due to the …

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, …

Download Citation | Ball mill driven with gearless mill drive | This paper introduces how PT Semen Bosowa/Indonesia considered the installation of a cement plant gearless mill drive, the criteria ...

Eleven 5MW gearless drives with synchronous motors running at low speeds (50-60rpm) drive three conveyors; two with four motors each and one with three. Two 20MW conveyors transport the ore from the open pit operation to the surface, overcoming an elevation change of around 1,300m, while the second conveyor feeds into a slightly smaller, …

More powerful and larger mills, higher ball charges and demanding ambient conditions call for a strong partner for grinding solutions. We help you meet these challenges with our drive systems that come with a long track record in improving performance and extending technical frontiers of all three mineral grinding applications: Gearless mills, ring-geared …

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 …

ball mill at Ciments Lambert-Lafarge, France. The 6.4 MW gearless motor is still operating today ... The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability. 3

The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings.

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.

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 …

time-taking grinding out of the ball mill. Ball mills with Energy savings typically up to 750,000 USD per annum for a 20 MW SAG mill considering a power supply price ... The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the ...

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 ...

The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le Havre in France. In the first few years, the GMD was only used in the cement industry. The GMD is also known as "wrap-around motor" or "ringmotor".