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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Fig 3 Schematic of Typical Gearless Mill Drive system [6] ... Drive with at least 120% starting torque without affecting the power network. 2) Operation of full system in harsh concentrator environment with wet grinding and high altitudes, commonly ... Control system detect torque from 30°75° by current measurement. If the load torque drops ...
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The concern for the input current is ignored and not yet analyzed. ... due to its higher starting torque (120% is usually required [54]), at low frequencies. In addition, a gearless mill drive ...
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Britta Meißner Company Profile | SchönwaldeGlien, Brandenburg, Germany | Competitors, Financials Contacts Dun Bradstreet
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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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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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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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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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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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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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Read online for free. Molino
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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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During each start, the gearless drive control verifies whether there is a frozen charge, and switches the mill off if that is the case. To stop, the operator presses the stop button on the MLCP. The gearless drive decelerates the mill over a speed ramp to zero. When the speed reaches zero, the charge in the mill is still un ba lanced.
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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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ABB Library is a web tool for searching for documents related to ABB products and services.
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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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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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GlasTechnik Konstruktion, Müller Müller OHG Company Profile | SchönwaldeGlien, Brandenburg, Germany | Competitors, Financials Contacts Dun Bradstreet
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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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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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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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ABB Marks 10 Years Since Return to Mining Equipment Factory with Manufacturing Momentum . ABB is set to celebrate its 10 th anniversary since it reacquired ownership of the gearless mill drive system business this week. The technology leader marks the milestone with record output in the last calendar year and a high for total number of employees, including women in key roles, at the ABB Ring ...
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The poles of the gearless or synchronous motor (also called wraparound 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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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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Gearless drive solutions are surpassing the mechanical limits of con ventional drive systems serving to utilize the principle of economies of scale. By elimination of various components of the drive train, the maintenance activities and spare parts inventories are reduced.
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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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Gearless mill drives. Longer service intervals thanks to lowwear 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 properties of the ore, resulting in significantly less
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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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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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