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Gearless mill drives library.e.abb

The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.

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Gearless Mill Drives Beneficiation Siemens Global

The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)

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Gearless mill drives Grinding ABB

Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor.

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Increasing availability through advanced Gearless Drive

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 figure 4.

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Increasing Availability through Advanced Gearless Drive

The Gearless Mill Drive system consists of the ring motor with its feeding cyclconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation system (for mill and motor) including HMI, monitoring and diagnostic system, MCC’s (for mill and drive auxiliaries), differential

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Gearless Drives Siemens

plied gearless drives for two 36-foot ring motors, de-veloping a 12,000 kW gearless drive for the Kennecott, 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

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mill dual motor sag mills grelck-kaminholz.de

mill dual motor sag mills. Mill drives the desire for increased power and the . 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 of operating at higher ball charge volumes (15 v/v to 20 v/v) has in turn led to higher motor power ratings. for a

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starting current gearless mill drive

starting current gearless mill drive. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of minerals. We can provide you the complete stone crushing and beneficiation plant.We also supply stand

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geared vs gearless drive solutions for grinding mills

Ring gear drives huge grinding mill machine design following the sag mill will be two ,hp ball mills, each one ft in diam and a ring gear drive offers several benefits, such as simplicity, low cost, and ease of and a ring motor gearless drive, either of which wraps around the mill.

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Increasing Availability through Advanced Gearless Drive

The Gearless Mill Drive system consists of the ring motor with its feeding cyclconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation system (for mill and motor) including HMI, monitoring and diagnostic system, MCC’s (for mill and drive auxiliaries), differential

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REMOTE DIAGNOSTIC SERVICES FOR GEARLESS MILL DRIVES

autogenous grinding (SAG) mills, or ball mills. The most important components of a GMD are the following ones: The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names “wrap-around motor” and “ring motor” (see Figure 1). Its purpose is to

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Literature Review: Gearless Motor Failures A Mill

Sep 10, 2014· The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel [8].

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A Mechatronic Solution Design and Experience with Large

tive optimization of the mill systems. The engineering complexities increased because the gearless drive could no longer be de-signed according to the stress principles alone but also incorporated stiffness prin-ciples as well. Stiffness criteria should be defined and exchanged between the motor supplier, the mill manufacturer and civil

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gearless mill drives Archives International Mining

Unlike more traditional ring-geared mill drives where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors GMDs work by mounting rotor poles directly to the mill body and surrounding it with the stator ring, meaning the mill itself is incorporated into the motor.

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(PDF) Technical Evaluation and Practical Experience of

Gearless motor for a high-power mill. fi ring angle in the recti In SAG mills in the air gap between rotor and stator is affected, whereas for HPGR mills is the operational gap; in both

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MONSAG: A new monitoring system for measuring the load

Nov 01, 2004· 1.. IntroductionLower ore grades, variable grindability, mineral handling and economics state a challenge for current mining operations. Looking for economies of scale, new mining projects consider big mill grinding circuits, with large power gearless motor drives (GMD) fed by cycloconverters in the range around 20 MW (Sams et al., 2001).Gearless Drives for semiautogenous grinding (SAG)

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Ring-geared mill drives Grinding ABB

Mill application features. Frozen charge protection Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection Prevents the motors from re-starting if the mill is still rocking or moving after a stop

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Insurability of Large Gearless Mill Drives (GMDs)

Sep 28, 2014· Introduction. We have written on risk associated with large ring motors in gearless mill drives previously [1, 2, 3]. In [1], we observed that ABB and Polysius were far too confident in 2001 when they claimed that 42 and 44 ft diameter mills and ring motors posed only manageable risks and that a 44 ft mill and GMD design was ready and waiting for a purchaser [4].

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gearless drive mills and crushers proves-projekt.de

Major FLSmidth mill order for Russian copper mine includes . The sag mills when installed will be the largest in all of asia all drives are gearless motor drives from abb each line will also include an flsmidth cone crusher solution with state of the art digitalisation and control system the first production line will be delivered in and the supply of the subsequent lines will continue throughout

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SAG Milling in Australia -Revised Submission

The CCV ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill

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starting current gearless mill drive

starting current gearless mill drive. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of minerals. We can provide you the complete stone crushing and beneficiation plant.We also supply stand

More

Ring gear drives huge grinding mill Machine Design

Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that

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SAG Mill Grinding Circuit Design 911metallurgist

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the

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