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The SIMINE Gearless mill drives pump system significantly enhances concentrator productivity by eliminating the reducer gear between motor and pump and all corresponding maintenance. In addition, the cyclone pumps with variable speed can adjust their energy consumption to the optimized flow of pulp, resulting in energy savings of up to 30%. The ...
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Gearless mill drives are a well established solution for grinding ... 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 ... Comparison of Drives Systems for Grinding Applications
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Traction elevators are one of the most commonly used types of elevators. They use a rope and pulley system to raise and lower the elevator cab. The weight of their cab is balanced by using a counterweight, which was first introduced in 1900. Nowadays, some elevators are using steel belts in place of steel ropes. … Continue reading "Geared vs. …
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ReGen's superior gearless wind turbines have been designed by Vensys AG with a minimalistic philosophy in mind. Our wind turbines are so advanced and yet so simple, made with the highest quality of intelligently designed engineering parts offering the highest efficiency levels in …
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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 about 6 Hz.
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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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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, . A picture of a gearless mill drive can be seen in Fig. 1a and b and an exploded view can be seen in Fig. 1c, which in most aspect is similar to the one being analyzed. A gearless mill drive ...
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The gearless advantage. By eliminating a failure-prone gearbox, permanent magnet direct-drive (PMDD) technology requires fewer components with only one moving part in the drivetrain, further reducing the lifetime maintenance costs of the turbine. The end result is less downtime, meaning an overall increase in turbine availability and increased ...
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Although GMDs have been in service for decades, and are known for their operational efficiency (reliability and robustness with reduced operating cost per ton), compared to conventional drives, in the last decade due to certain reasons some failures led to serious unscheduled shutdowns and significant insurance events.
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Gearless mill drives Go gearless. tional mill drive system, such as ring-gear, pinion, gearbox, coupling,, Cie) commissioned the first GMD ever, a 64 MW gearless motor for a ball mill at Ciments Lambert-Lafarge in Le Havre, France Still operating today, it has proven to perform cost-effectively and with long-term reliability, our gearless ...
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next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual design approach considering, on the one hand, the experi-ences Siemens made with Gearless Mill Drive (GMD) instal-lations over the past 40 years and, on the other hand, using computerized design tools calculating the system behavior where experience does not yet exist.
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Presently the gearless drive is more costly than the complete mechanical portion (mill rotating element and accessories supplied by the mill manufacturers) and hence the customer/consultant needs to have two parties to deal with from the start of any project. There is an interface between the mill vendor and the gearless motor supplier.
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The $1.2 billion expansion, which saw throughput rise from 60,000 t/d to 120,000 t/d, involved the addition of two new thyssenkrupp-made ball mills, with ABB providing the gearless mill drives (GMD) technology. This came on top of the 33 mills the miner already had up and running as part of the existing 60,000 t/d plant at the operation.
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Gearless mill drive systems connect the motor directly to the mill, as the name suggests this eliminates the need for gears, gearboxes and couplings. The benefits are a touchless drive system which means less interface and higher equipment availability, Siemens boast above 95% availability when maintained and installed correctly.
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SIMINE Gearless mill drives – outstanding reliability for your mine The gearless concept The gearless drive avoids any contact between the rotating mill and the static parts of the motor. This allows for contin-uous workflow without maintenance on the gears or the pinions. What used to be downtime is now productive time.
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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 16.5 MW GMDS are employed in 26 football mills along with associated control systems.
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inching drive ball mill spares - johannsoutdoornl. inching drive ball mill spares rodekruisnijmegengala nl inching drive ball mill Grinding Mill China inching drive ball mill IMEDICA Inching Drive Backstops/Brake System for Ball Mills Kiln The inching drive is an auxiliary drive for rotating the ball mill when maintenance work is done on the mill …
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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 SAG-Mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor
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The gearless drives system in comparison uses only two (2) drive pulleys, each with a 3,800 kW rating. Hence only two cycloconverters and two medium-voltage switchgears were needed as opposed to the original four VFD's and four medium-voltage switchgears. By reducing the electrical equipment, the E-house footprint was half of the original size.
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Geared vs Gearless Hub Motors Comparison Gearless or direct drive hub motors are equipped for giving a lot of torque and force. This makes them particularly appropriate for performance electric bikes. Direct drive motors are normally large and heavy which means you get less range out of them. The benefit is that this additional mass stops the ...
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Eliminating such components significantly increases the efficiency and the availability of the mill. The gearless motor is fed by a cyclo-converter which lets the operator easily vary the mill's operational speed. ABB (then BBC: Brown Boveri & Cie) installed the world's first Gearless Mill Drive (GMD) in 1969.
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mill from and a 28 Mega-Watt (MW) Gearless Mill Drive (GMD) from ABB for the Conga Project in Peru. The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. This paper
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Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust ...
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