start the motor and to vary speed during operation, which means that it satisfies both requirements. The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in Fig. 1. Figure 1 Top view of SAGMills with alternative drive options; left side: dual pinion drive including
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There are many options for starting, controlling and driving mills, with the optimum choice depending on the size of mill or power requirement. The selection between variable speed drive (VSD), directonline or gearbox solutions usually depends on economic life cycle evaluation and site requirements.
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for starting, controlling and driving mills, with the optimum choice depending on the size of mill or power requirement. The selection between variable speed drive (VSD), directonline or gearbox solutions usually depends on economic life cycle evaluation and site requirements. Gearless mill drive For mills that are large in diameter or ...
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Figure 3: Dual pinion ball mill with 6500 kW Low Speed Squirrel Cage Induction motors using VFC Figure 4: Two SAG Mills 24MW each and Two Ball Mills MW each with Gearless Mill Drives For larger applications the wellproven Gearless Mill Drive (GMD) technology has shown to be very effective since its
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To prevent accidental mill startup • An additional safety measure for maintenance work, when the inching drive is engaged Accessory kits To make the drive adaptable to other mills • Allows the inching drive to be portable and adaptable for additional mills • The kit includes: a sole plate, driven gear hub for mounting, coupling guard ...
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1. The use of GCDs in the world's largest conveyor system In Chile, ABB is partnering with TAKRAF Tenova Chile to supply gearless conveyor drives (GCDs) for the extension of a copper mine, which incorporates the world's largest conveyor system (13km) connecting the subterranean operation directly to the concentrator.
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Gearless mill drives (GMDs) constitute a compelling alternative to traditional ringgeared mill drives (RMDs) in such environments. Both drive types can be used to power large semiautogenous (SAG), ball and autogenous mills, but GMDs are proven to offer superior availability, uptime and efficiency. When the first GMD was developed by ABB in ...
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Mill operators face the twin challenge of increasing production to meet demand for commodities and declining ore grades. Marcelo Perrucci, Global Product Line Manager, Grinding, ABB, explains why gearless mill drives (GMDs) are increasingly becoming the solution of choice for highcapacity mills. Published in Global Mining Review October 22.
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COURSE DESCRIPTION CHH624 Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in formation on safe operation and maintenance of the gearless mill drive (GMD) system.
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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. Today, GMDs are mainly used for SAG mills between 36 and 40 feet ( to m) and ball mills from 24 to 28 feet ( to m).
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of the inching reducer drive can be added to reflect efficiency losses. P inch = P inch ·(1 + (stage · )) where stage is the number of reductions between the inching drive motor and the main drive input shaft (or mill pinion if direct driven) Round up P inch to the next standard motor power. This standard motor power becomes the incher ...
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There are variety of applications of cycloconverter such as gearless motor drive in cement industry, centrifugal pump, electric traction, rolling mills, variable speed constant frequency (VSCF) system, ship propellers etc. Evaluation of cycloconverter fed semiautogenous grinding (SAG) mills have been extensively discussed in [ 7, 8 ].
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Norge Mining and ABB to design a nextgeneration mine to help meet Europe's energy transition ambitions. . ABB marks 10 years since return to mining equipment factory with manufacturing momentum. . ABB and Perenti collaboration awarded allelectric mine study from Australian operator IGO.
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mill load cascaded, meaning the operation is normal as expected and startup is continued. If the actual value of the torque is still equal to the maximum value, a frozen charge condition exists and the Gearless Drive is switched off allowing the mill to safely oscillate. An alarm (via HMI) alerts the operator and informs about the cause of the
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As a result of today's requirements for larger mills with higher power demand, and in order to cope with maximizing throughput, and optimize grinding efficiency, the minerals industry is increasingly relying on the robust Gearless Mill Drive (GMD) solution.
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found in a conventional mill drive system, such as the ringgear, pinion, gearbox, coupling, motor shaft and motor bearings. In ABB GMDs, the rotor poles are mounted directly onto the mill, which effectively becomes the rotor of the gearless motor. The motor is fed by a fuseless cycloconverter connected
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Build or revamp your mine and mineral processing plant using optimal system solutions, coordinated and seamlessly integrated into fully engineered packages. Our unified, crossfunctional, enterprisewide approach to digital transformation in mining ABB Ability™ MineOptimize is paving the way from a mine with islands of automation to a fully ...
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Guerrero and Pontt investigated the oscillatory torque caused by dead time in the current control of a highpower gearless mill drive. Szolc et al. ... In general, the motor can drive the ball mill to start. When =3 s, the clutch reaches the synchronous process and working speeds at and s, respectively.
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The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four MW GMDS are employed in 26 football mills along with associated control systems.
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siemens product manager. low iron prices2005. ft idstart. Embed Size (px) 344 x 292 429 x 357 514 x 422 599 x 487. Gearless Mill Drives. Machinery Risk Solutions Practice. Matt Dugalic, MARSH MRSP Risk Consultant, VPKurt Tischler Dipl.Ing., Siemens Product Manager, Mining. Page 2.
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Gearless Mill Drive Protection Improvements and Its Behavior at Minera Escondida Ltda. Luis Nieto C. Gerencia Mantenimiento Procesos Minera Escondida Ltda, MEL ... Current : 2485 A Base Speed : rpm Maximum Speed : rpm Base Frequency : Hz Maximum Frequency : Hz The grinding mill is the rotor of the
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Single cement mill of 160 metric tons / hour was required. No gearbox manufacturer could supply a gearbox for this. BBC (later ABB) came up with the idea of a Gearless Mill Drive. BBC was awarded to supply the first GMD in 1969 Le Havre/France. The first GMD was running with its original design from 1969 until.
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Voltage waveform at the rectifier input side of an 18 000hp LCI SAG mill drive. (a) Rectifier input line current (800A peak). (b) Average rms value mill drive. (a) Linetoline bus voltage waveform (11 270V peak). ... has an important impact in power distribution speed is needed for starting and low speed positioning of the system operation ...
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Current GMD and grinding mill technology is ready to be supplied with installed power exceeding 30 MW, ... 20 MW SAG mill, you now have the option of a 38 ft gear driven mill. At this size gearless drive is a viable option, but it is significantly more expensive and therefore can pose a challenge. Likewise, the implementation of 42 and 44 ft ...
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This paper presents the technical details of the world's first 42 foot diameter 28 MW gearless SAG mill, installed at the Conga coppergold project in Peru. It explains the challenges and solutions for designing and operating such a large mill, and how it delivers high efficiency and low maintenance costs.
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With our SAG mill running at % critical speed (mill RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately MW of slip energy; the power ...
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subscribers Subscribe views 4 years ago https:///mining/grinding/g... | ABB ensures maximum throughput, highest availability and peak performance throughout the life cycle of...
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Management of Companies and Enterprises Activities Related to Real Estate Electric Power Generation, Transmission and Distribution
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Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a polyphase voltage with the frequency f1 into a single or polyphase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from Hz up to about 6 Hz.
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mills have gone bigger and bigger. While mill diameters have touched 42 feet, at the same time power required has gone upto 38 MW per system. Because of huge processing requirements, mills have migrated from geared to gearless and accordingly changes in mechanical systems, drive motors and power converter technologies have thrown a
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The first Gearless Mill Drive (GMD) with a power of MW was ... current reverses, when the current commutates to the antiparallel bridge, a short dead time is observed before the firing of the anti ... ranges from the starting point up to the drive operational range. In this range, the output has a constant torque capability with ...
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The gearless mill drive (GMD) has been continuously developed since its introduction in 1969. The structural design, the electrical parts and of course motor monitoring and control have all experienced major developments that have enabled larger, more efficient operations and higher productivity.
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Go Gearless. Gearless Mill Drives. Robust. Available. Efficient. Compatible Good reasons to go gearless. In minerals processing, profit requires throughput. Grinding lowgrade ores calls for Robust high volume mills and roundtheclock Our GMD is strong, rigid and round. The reliability. High power, huge capacity, and brute tremendous forces involved with today's huge strength are balanced ...
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Although majority of the LCI drive applications have rated output frequency in the range 40 to 60 Hz the drive can reach output frequency up to 100.120 Hz with minimum modifications. In combination with 2pole turbomotor a direct drive with up to 7'200 rpm can be realized [1]. First projects semi highspeed LCI driven motors had
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