grinding mills gearless

The size reduction, crushing and grinding, is one of the main stages in mineral processing, because of energy, material and maintenance costs. Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied for ...

Updates on geared vs gearless drive solutions for grinding mills. SME 2013 Abstract. The current paper looks at evaluating the merits of large geared mills versus gearless driven mills by evaluating the following factors: The capability of currently available systems in terms of power and mill diameter;

Concepts of Gearless Ball-Mill Drives ... 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 ratings required have increased to several thousand horsepower, and as advances in technologies in terms of the use and ...

For grinding of the ore, an SAG (Semi Autogenous Grinding) mill and a ball mill will be used. 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.

Grinding is a crucial process step in ore processing – and for a mine's overall performance. That's why a grinding mill's gearless drive is the crucial piece of equip-ment in the concentrator – and why it is subject to very rigorous demands. High availability and reliability throughout the entire lifecycle are a must, while unplanned

Gearless Drives for grinding mills Gearless Drives are well proven stateof theart technology for large grinding mills Siemens the company that introduced Gearless Mill Drives GMD to mining industry started up its first GMD on a ball mill in Norway in …

Gearless drive systems for belt conveyor and grinding mills commissioned in Xstrata copper mine in Peru ... The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball ...

SIMINE Gearless mill drives A standard of reliability and efficiency for grinding From Norway to Zambia, from Mongolia to Chile – for over 30 years, mining operators all over the world have been counting on SIMINE Gearless …

A gearless grinding mill comprising: a stator comprising a bore therethrough, said stator further comprising a plurality of linear stator portions; a shell rotatably mounted at least partially within said bore; and at least one winding mounted on said shell separated from said stator by an air gap. 2. A grinding mill in accordance with claim 1 ...

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 is the world leading supplier …

The stator of a gearless grinding mill is large and cannot fit in a Vacuum Pressure Impregnation (VPI) tank, which is typically utilized during the manufacture of stators for synchronous machines and other rotating and linear electrical machines. Available VPI tanks typically have a diameter of twelve feet or less and a depth of ten feet or less.

GEARLESS DRIVES FOR GRINDING MILLS 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 Fig. 4. 18

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 mill drives 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-

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 ...

The largest mills have gearless drives. Dry grinding AG and SAG mills are available. Overflow discharge rod mills are available from 75 to 2,000 hp ( 56 to 1,490 kW ), while overflow discharge ball mills ranging from 75 to 8,000 hp ( 56 to 5,970 kW ) are included in the standard wet grinding line.

Premier™ horizontal grinding mills. Outotec Premier™ horizontal grinding mills are customized and optimized grinding solutions built on advanced simulation tools and unmatched expertise. A Outotec Premier™ horizontal grinding mill is able to meet any projects needs, even if it means creating something novel and unseen before.

Gearless Drives for grinding mills Gearless Drives are well proven stateof- the-art technology for large grinding mills. Siemens, the company that introduced Gearless Mill Drives (GMD) to mining industry started up its first GMD on a ball mill in Norway in 1980. The mill and its drive system are still in service.

The reliability of large diameter, high horsepower ball mill is paramount when large production and minimum downtime is required. The 17 ft. x 56 ft. double compartment ball mill at St. Lawrence Cement Company has the first gearless drive built in North America and has the world's largest hydrodynamic bearings currently built and running.

CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 MW . CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL ABSTRACT In 2010 Newmont made the decision to purchase a 42 foot (ft) Semi-Autogenous Grinding (SAG) mill from and a 28 Mega-Watt (MW) Gearless Mill Drive (GMD) from ABB for the Conga Project in Peru.

Gearless mill drives - Grinding | ABB Gearless mill drive system (GMD) Maximum availability and productivity Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations.

Two 28 MW gearless mill drive systems (GMDS) are operating in the mine's 12-metre SAG mills and four 16.5 MW GMDS are employed in 26 ball mills along with associated control systems. "Gearless mill drives are the 'workhorses' for grinding operations which are at the heart of any mine. The six ABB GMDs at the world class Cobre Panama project are ...

Gearless Motor Drives for Grinding Mills . Fig. 1, General scheme of a Gearless Mill Motor drive [24]. of the airgap is in the range of 15-17 mm. A tolerance of

Grinding Mills. CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector. Our largest mills has been delivered to SINO Site to date are Ø12.2m x 11m 28MW Gearless Drive AG Mills and Ø7.9m x 13.6m 2x8 MW Twin Pinion Drive Ball Mills. These mills are scheduled of start up on 2012. Our market share in China exceeds 80% with the ...

Gearless mill drives 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-

That's why a grinding mill's gearless drive is the crucial piece of equip- ment in the concentrator – and why it is subject to very rigorous demands. High availability and reliability throughout the entire lifecycle are a must, while unplanned downtime needs to be minimized by proven design and skillful maintenance planning.

https://new.abb.com/mining/grinding/gearless-mill-drives | ABB ensures maximum throughput, highest availability and peak performance throughout the life cycl...

En el marco del Encuentro de Operadores (Edición 30 de PERUMIN) se realizó la conferencia: "Geared vs Gearless drive solutions for grinding mills".Ponente: C...

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

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.