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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Britta Meißner Company Profile | SchönwaldeGlien, Brandenburg, Germany | Competitors, Financials Contacts Dun Bradstreet
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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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mill startup and allows features like frozen charge protection, controlled roll back and positioning for mill maintenance needs. Figure 6 Full vacuum pressure impregnation for windings. Figure 4 Ringgeared mill drive solutions. Figure 5 Gearless mill drive solution. Throughout the comminution process, different mills are driven
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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 has received an order to replace the shaft mounted geared drives of existing conveyors in a European mine by GCD. The conveyors are connecting the mine with the power station. The gearless drive will be designed so that it can replace the geared drive unit without considerable modification of the existing drive pulley and main structure.
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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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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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More powerful and larger mills, higher ball charges and demanding ambient conditions call for a strong partner for grinding solutions. We help you meet these challenges with our drive systems that come with a long track record in improving performance and extending technical frontiers of all three mineral grinding applications: Gearless mills, ringgeared mills and high pressure grinding rolls.
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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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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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This work addresses some current issues involving design ... starting with full torque within limited shortcircuit level, ... General scheme of a Gearless Mill Motor drive [24].
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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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ABB Library is a web tool for searching for documents related to ABB products and services.
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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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BERASCO Company Profile | SchönwaldeGlien, Brandenburg, Germany | Competitors, Financials Contacts Dun Bradstreet
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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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gearless ringmotor. Typical gear driven mill and gearless mill with a ringmotor 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 pinions, MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used MPa (6000 hp) motors ...
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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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Gearless Mill Drive Protection Improvements and Its Behavior at Minera ndida Ltda. Luis Nieto C. Gerencia Mantenimiento Procesos Minera ndida 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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We provide optimized mill drive solutions for all types of ringgeared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and low maintenance operation. Video explaining ABB ring geared mill drive technology eBook: Grinding transformation
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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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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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Do more with less go gearless. Mine operators are challenged with moving more material on conveyors that may cover distances in the tens of kilometers and ascend steep gradients. To increase overall reliability, mining companies also want fewer transfer stations between conveyors, which may require wider and longer belts.
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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 longterm service agreement (LTSA). Joel Desmeules, Construction Manager for the SAG mill, at Kinross. "We are pleased with the ABB team's ...
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The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two ThreePhased Cycloconverters. The rotor has salient poles without dumping windings and it consists of 72 poles. The cycloconverters work in the outofcirculation current mode and they are connected to a MVA transformer.
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These milling features provide an indication of the current milling efficiency as well as if current conditions may be causing excessive wear on liners. ... (then BBC: Brown Boveri Cie) installed the world's first Gearless Mill Drive (GMD) in 1969. This GMD powered a 16 feet (ft) cement mill in Le Havre (France), which today, some 40 ...
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