sag mill gearless drive

Gearless Warp Around SAG Mill - 911metallurgist

Gearless Warp Around SAG Mill - 911metallurgist

Gearless Warp Around SAG Mill 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 .

Ring gear drives huge grinding mill | Machine Design

Ring gear drives huge grinding mill | Machine Design

By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and refining. The largest ring gear will make it happen

bearings in gearless mill drives - educationcare

bearings in gearless mill drives - educationcare

Design of the 40 foot SAG Mill Installed at the Cadia Gold . - zenith. and competent necessitating the use of both a variable speed mill drive and pebble ... with a 20 MW Siemens gearless drive motor with bi-directional rotational capability. . cells, mounted in the bearing assembly on the mill discharge, and.

SIMINE Gearless mill drives

SIMINE Gearless mill drives

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 .

(PDF) Technical Evaluation and Practical Experience of .

(PDF) Technical Evaluation and Practical Experience of .

Voltage waveform at the rectifier input side of an 18 000-hp LCI SAG mill drive. (a) Line-to-line bus voltage waveform (11 270-V peak). (b) Average rms value of the associated frequency spectrum .

Gearless Drives

Gearless Drives

pace. In 1996, Freeport ordered the first gearless drive for a 38-foot SAG mill located at the company's Grasberg plant in Indonesia. This gearless drive pro-vides an astonishing 20,400 kW of power. In 1998, Siemens supplied the first gearless drive for a 40-foot SAG mill at the Cadia Hill Mine in Australia. While the details vary, there is a .

Preprint 13-050 - ceecthefuture

Preprint 13-050 - ceecthefuture

Presently the gearless drive is more costly than the complete mechanical portion (mill rotating element and accessories supplied by the mill manufacturers) and hence the customer/consultant needs to have two parties to deal with from the start of any project. There is an interface between the mill vendor and the gearless motor supplier.

SIMINE Gearless mill drives - Siemens

SIMINE Gearless mill drives - Siemens

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 wear to the mill lining. The mill's direction

Gearless mill drive order in Kazakhstan - Mineral Processing

Gearless mill drive order in Kazakhstan - Mineral Processing

ABB recently won an order worth 44 million US to deliver three gearless mill drive systems (GMDs) for a new copper mine to be operated by Kazakhmys PLC (Kazakhmys) in southeastern Kazakhstan. The contract was awarded in the first quarter of 2012. Kazakhmys is the largest copper producer in Kazakhstan and one of the top copper producers in the .

Commissioning Variable Speed SAG Mill Gearless Drive

Commissioning Variable Speed SAG Mill Gearless Drive

Table of ContentsGeneral Description of the DriveAssembling and ConstructionComponent CharacteristicsDrive Evaluation The electric operation and design features of the 11,000 H.P. variable speed SAG mill gearless drive is presented. The function of the frequency-converter, control system drive and lubrication systems are described. An analysis of the harmonic characteristic in the Supply .

Mill (grinding) - Wikipedia

Mill (grinding) - Wikipedia

SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but 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.

Updates on geared vs gearless drive solutions for grinding .

Updates on geared vs gearless drive solutions for grinding .

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.

Siemens expands mining portfolio to include gearless drive .

Siemens expands mining portfolio to include gearless drive .

Siemens is now able to provide to mining companies a gearless drive system for SAG mills with a tube diameter of 42 feet. This enables throughput to be almost doubled in comparison with the 38-foot mills commonly used today. With this innovation, Siemens is responding to the rising demand for larger and more powerful drives in mining.

The operation modes of a grinding mill with gearless drive

The operation modes of a grinding mill with gearless drive

behavior of the gearless drive and of the mill during these modes of operation. Normal Start can be operated from the local control panel or remotely. The gearless drive accelerates the mill slowly to the preselected speed. In the Normal Stop procedure, the gearless drive reduces the mill speed to zero and stops the mill without oscillation .

Mill (grinding) - Wikipedia

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.

Unused  36' X 20.5' (10973mm X 6248mm) Sag Mill .

Unused 36' X 20.5' (10973mm X 6248mm) Sag Mill .

Buy Unused 36' X 20.5' (10973mm X 6248mm) Sag Mill, 15,000 Kw (20,107 Hp) Gearless Motor Drive, 50 Hz from A.M. King Industries. Request a quote online today.

INNOVATION NEWS Mills and GMDs -

INNOVATION NEWS Mills and GMDs -

reliable drive system for SAG mills. Early SAG mills had a diameter of about 32', later increasing to 34, 36, 38 and 40'. At the same time the mill volume also increased. Typically a SAG mill has a much larger diameter compared to its length. Yet the SAG mill of Newmont's Yanacocha mine in Peru is a single

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL .

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL .

Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions. Due to the variable speed operation the grinding process can be optimized for ores with varying grinding properties.

2009 Gearless Mill Drives

2009 Gearless Mill Drives

Gearless Mill Drives Machinery Risk Solutions Practice 2009 Matt Dugalic P.Eng., MARSH – MRSP Risk Consultant, VP Kurt Tischler Dipl.-Ing., Siemens – .

Gearless drive systems for belt conveyor and grinding .

Gearless drive systems for belt conveyor and grinding .

The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball mills were also fitted with gearless drive systems, each providing 16.4 MW. Also included in the scope of supply were transformers, E-houses, the drive control, the cooling system, protection equipment and .

Grinding mills - for mining and minerals processing -

Grinding mills - for mining and minerals processing -

Every mining operation has a unique grinding process. 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.

gearless sag mill slip ring motor

gearless sag mill slip ring motor

sag milling in australia – focus on the future Orway Mineral The Fimiston 10.97 m (36 ft) SAG mill uses twin wound rotor/gearbox/ The CCV – ring motor (gearless) drive is .

Gearless Mill Drive Sales Rev Up to Meet Demand

Gearless Mill Drive Sales Rev Up to Meet Demand

Gearless Mill Drive Sales Rev Up to Meet Demand By Russell A. Carter, Managing Editor. Gearless mill drives are becoming the drive system of choice on large AG, SAG and ball mill installations for new projects and existing mill expansions. At least 31 GMDs have been ordered from Siemens and ABB, for .

Literature Review: Gearless Motor Failures – A Mill .

Literature Review: Gearless Motor Failures – A Mill .

Sep 10, 2014 · Remedial design of the world's largest SAG mill gearless drive. In Proceedings of the SAG 2001 Conference, Vancouver, Canada. [8] Frank, W-D., Gearless drives – Experiences and new/future developments. In Proceedings of the SAG 1996 Conference, Vancouver, Canada. [9] Orser, T., Svalbonas V., Van de Vijfeijken, M., 2011. Conga: the world's .

sag mill motors - sbm-impactcrusher

sag mill motors - sbm-impactcrusher

Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h . Wrap-around Motors Cycloconverters & Excitations Transformers, E-House containers . Gearless AG/SAG mills - Gearless AG/SAG mills. With the proven use of gearless drive technology, the limitation of AG/SAG mill size due to gearing constraints has been eliminated.

Gearless mill drive (GMD) and digital services for Kinross .

Gearless mill drive (GMD) and digital services for Kinross .

The company selected ABB's 26 MW gearless mill drive system (GMD) for the mine's 40 ft SAG mill, as well as other drives, electrical infrastructure equipment and a long-term service agreement (LTSA). This is expected to reduce operating costs, improve process throughput and reliability while saving energy and keep equipment in top form.

Advantages of Gearless Motor Drives in Large Ore Grinding .

Advantages of Gearless Motor Drives in Large Ore Grinding .

Gearless motors up to 22 MW are in service in many of these ore processing plants. Gearless motor drives are also known as "ring motors" or "wrap around motors." The motor consists of a large number of magnets placed circumferentially on the shell of the grinding mill. This is similar to the rotor of a conventional motor.

Gearless Sag Mill Maintenance Schedules

Gearless Sag Mill Maintenance Schedules

Gearless mill drives Grinding ABB. 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 design to provide highest throughput, reliability

Gearless Drives from Siemens Helping Improve Efficiency .

Gearless Drives from Siemens Helping Improve Efficiency .

The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball mills were also fitted with gearless drive systems, each providing 16.4 MW. Also included in the scope of supply were transformers, E-houses, the drive control, the cooling system, protection equipment and .

Current Issues on High-Power Cycloconverter - fed Gearless .

Current Issues on High-Power Cycloconverter - fed Gearless .

II. BACKGROUND: SEMIAUTOGENOUS GRINDING (SAG) MILL WITH A GEARLESS DRIVE Fig. 1 shows the general scheme of a mill with gearless motor drive. The rotor poles of the synchronous machine are bolted to the mill. There is no gear, because the elec-tromagnetic torque is generated directly to the mill. The sta-