Gearless mill drives (GMDs) constitute a compelling alternative to traditional ring-geared mill drives (RMDs) in such environments. Both drive types can be used to …
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GEARLESS MILLS (GMDS) Fig 3 Schematic of Typical Gearless Mill Drive system [6] The principle idea behind a gearless drive system is to reduce the number of components and diversity of parts. Fig.3 shows the general scheme of a mill with gearless motor drive and the rotor poles of the machine are bolted to the mill.
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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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gearless ringmotor. Typical gear driven mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors ...
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Optimize mill operation – with gearless mill drives. Siemens has provided almost 100 SIMINE Gearless mill drives to the mining industry since 1980. In these thirty-plus years, SIMINE Gearless mill drives have accumulated a combined total of over 500 years in operation time – and this number is steadily growing even as you read this.
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Most of these mills are driven by adjustable-speed drive 2000 m (6000 ft) above sea level; synchronous machines, connected to cycloconverters or load- 3) low-frequency output, because large diameter grinding commutated inverters (LCIs) controlling the motor speed and mills must rotate at variable low speeds, in the range from torque [2], [8].
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ABB's state-of-the-art gearless mill drives (GMD) and gearless conveyor drives (GCD) have already become differentiators when combined with advanced digital services. These two technologies have become an ideal and futureproof solution for our industrial customers. We delivered the world's first gearless mill drive to Lafarge …
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¿Por qué Gearless Mill Drive (GMD) significa eficiencia? Porque el par necesario para girar el molino se transmite entre el motor GMD y el molino a través del campo magnético en el pequeño espacio de...
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For this expansion project, Kinross selected ABB to provide a 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 …
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Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to …
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Maximum availability and productivity. Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the …
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Your benefit: Better skills with no risk to operations. In short, the Training Simulator helps your personnel become experts – with no operational risk. It optimally complements …
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Harmonic measurements on gearless mill drive at the factory are not possible as the GMD is assembled for the first time on site. II LNG plants comprise large non-linear loads driving gas compressor, however those loads produce integer harmonics. Design by analysis process is an alternative to the
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A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or ...
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of the inching reducer drive can be added to reflect efficiency losses. P inch = P inch ·(1 + (stage · 0.01)) 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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The first gearless mill drive was introduced by ABB in 1969 (then Brown Boveri & Cie) and installed at France's Ciments Lambert-Lafarge in Le Havre, [28]. A picture of a gearless mill drive can be seen in Fig. 1 a and b and an exploded view can be seen in Fig. 1 c, which in most aspect is similar to the one being analyzed. A gearless mill ...
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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. This training will help to enhance the operation and the maintenance of the GMD in order to ensure
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mill The result is the design of a Gearless Mill Drive motor for a 42ft Grinding Mill providing up to 35MW of power. Evolution is still the main GMD design philosophy, but realistic …
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A gearless mill drive is a major investment for a plant and as the beating heart of the production process is essential. Thus, having knowledge of how to make …
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ABB's Marcelo Perrucci explains how Gearless mill drives, digitalization, AI and analytics are transforming grinding operations at mines worldwide. White paper
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SAG mill, 40 ft, 42 ft, gearless mill drive, GMD, SAG manufacture, reliability THE PROJECT The Conga Project is located in Peru adjacent to Newmont's existing Yanacocha operations. The Conga Project has been in various development stages for approximately the last 15 years. In the last 5
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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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Extracting Potential with Gearless Mill Drives and Gearless Conveyor Drives - Global Mining Review - May/June 2020 (English - pdf - Article) Conveyors: durable and continuous (English - pdf - Article) The benefits of modern drives (English - pdf - Article) Gearless drives for medium-power belt conveyors (English - pdf - Article)
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(From the archive of "bulk solids handling", article published in Vol. 34 (2014) No. 1, ©2014 bulk-online)When it comes to drive sizes exceeding 3500 kW per individual drive, there are no conventional drives with electric motors and helical bevel gears.Gearless drives, like those implemented for mine hoists in underground mining operations, allow …
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The technology is available for an up-sizing of cement grinding installations and the gearless mill drive is a proven, reliable drive. View. Show abstract. Evaluation of mill drive options.
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Gearless Conveyor Drives: the power behind the world's largest open-pit copper mine. How digitalized gearless drive technology results in energy savings and improved performance.
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The definition of mill speed that the process engineer should specify to the motor designer (or vendor) is mill speed as ϕRPM, revolutions per minute. The motor designer (or vendor) will convert the specified rated mill speed into the speed of the motor, ωrated as Hz, which for a Gearless Mill Drive is simply ϕRPM ÷ 60. For a gear driven ...
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The invention relates to a stator core for a gearless drive of a tube mill having high stiffness, wherein the stator core, together with a stator frame, forms a stator for a gearless drive of a tube mill and the stator core comprises stator core pieces (1, 1'). Said stator core pieces (1, 1') are connected to each other in the rotational direction of the …
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Central Drive Single Pinion Dual Pinion Gearless Number of mills Power [MW] 4 Figure 1: Typical mechanical mill configurations The central driven mill solution is found on the lower power range of the mills due to the high torque that has to be transmitted to the mill through the torque tube at the charge or discharge side of the mill.
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es.augi.es. Polysius supplies for the new grinding plant comprise an SAG mill of 6 .1 m diameter x 2.7 m length with a 1,400 kW COMBIF LEX® drive and a ball mill of 4 .6 m diameter x 8.84 m length with a 2,950 kW COMBIF LEX® drive. polysius.de.
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developed in the mill drives. The SAG mill gearless drive stator deflected excessively during inching and it "resonated" at normal operating speeds. Furthermore, the ball mill gears were severely scored after four months of operation. EAnD were commissioned by Cadia to determine the causes of the drive problems and to develop
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Pinion misalignments, resonance, unbalance and bearing & gear meshing faults in geared trains, as well as long-term changes in the condition of the mechanical components or structures and auxiliary systems in gearless systems are the main reasons for unscheduled downtimes in today's mill drive trains.
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insurers view the specific risks related to large Gearless Mill Drive (GMD) mills, and why the insurability of these large mills is a significant concern to the mining industry that utilizes them, the manufacturers that design and construct them, and the insurance companies that provide coverage to the users. Introduction to Risk Management
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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". Almost 25 years later, the first GMD with 12.0 MW power
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Máxima produtividade e disponibilidade. Passe a operar sem engrenagens, para atingir suas metas comerciais excedendo as metas de disponibilidade padrão em suas operações de moagem. O GMD da ABB é o sistema mais potente de acionamento de moinhos no mercado para alimentar moinhos semi-autógenos (SAG), de esferas e autógenos (AG).
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The gearless mill drive (GMD) can be considered the workhorse for specific grinding processes found in the mineral processing industries. Therefore, it is of particular importance to ensure that its operation is as rarely interrupted by unplanned downtime as possible, and as close to optimal operating conditions as possible.
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