the speed control system, behaves like a DC machine. The TRANSVEKTOR control system used on high-power mill drives has gone through a long development phase. A lot of experience has been gained with this system during the last 33 years. The first gearless drive with this control has been operating successfully for more than 30 years.
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CHH621 – Gearless Mill Drive Theoretical System Overview. Course goal. The goal of this course is to provide participants with the required theoretical knowledge of gearless mill …
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Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical …
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With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, …
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The optimum operation was found after 3000 hours running. The capacity was some 10% over the guaranteed capacity. This large mill 17′ x 56′ is not less efficient than a smaller mill 10′ x 28′ used in comparative tests. Maintenance of "Gearless Drive" Mill. The lubrication system. This depended on gravity feed of oil to the bearing pads.
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ABB gearless mill drive (GMD) system explained in 3 min. Highest power, availability and energy savings up to 3%. Unlike more traditional ring-geared mill drives – where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors – GMDs work by mounting rotor poles directly to the mill body ...
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• 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful mill drive system available,
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This document summarizes the current design criteria and the due diligence approach from Siemens in designing the next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual …
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A major advantage of the gearless mill drive is the absence of wearing parts. The extra load on the mill bearings due to the motor weight is only about 15 %, and this does not raise undue problems. The gearless mill drive allows a more flexible layout of the mill room, since the mill drive is not mechani cally connected to the mill.
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The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor …
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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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Compared with the combination of high-speed motor and gearboxes otherwise used in belt conveyor systems, the gearless drive solution offers a range of benefits. The size of the motor is not limited anymore by the size of gearbox, thus eliminating the necessity to install multi-motor drives. The required belt driving power …
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is currently the gearless mill drive (GMD). In GMD systems the motor's poles are directly installed on a pole flange on the mill shell, and the body of the mill itself becomes the rotor. Ring-geared mill drive For mills with standard diameters or requiring less than 20 MW (approx.) of power, ring-geared mill drives (RMDs) offer the best solution.
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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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The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings.
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Go gearless for highest availability The ABB gearless mill drive is the most powerful mill drive system on the market. It provides highest availability, long-term reliability, flexibility and efficiency at competitive cost. This is achieved by eliminating all mechanical components of a conventional mill drive system (ring-
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New Human Machine Interface - RMD Cockpit. With the RMD plus solution, operations and maintenance activities are fully optimized with the newly developed Human Machine Interface "RMDcockpit".. Based on ABB's 800xA platform, the RMDcockpit is a specific mill application tool comprised of a touch screen panel allowing full access to the main …
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The company selected ABB's 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 agreement (LTSA). This is expected to reduce operating costs, improve process throughput and reliability while saving energy and keep equipment in top form.
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Figure 4: Two SAG Mills 24MW each and Two Ball Mills 16.4 MW each with Gearless Mill Drives For larger applications the well-proven Gearless Mill Drive (GMD) technology has shown to be very effective since its introduction in mining in 1980; currently in operation for horizontal mills up to 40 feet (~12.2m) diameter with
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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 failures. For demanding applications in the mining industry, protections systems need to be reviewed considering special or abnormal operating conditions as …
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Building on over 130 years of experience in the mining industry, ABB's Ring Motor factory located in Galindo provides the engineering and manufacturing of ring motors, the main component of ABB's Gearless …
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Gearless drive systems for conveyors or mills can simplify installation, increase machine efficiency and reduce maintenance costs, according to a company that's been a pioneer in the technology. A Siemens gearless …
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2 GEARLESS MILL DES The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. Building a track record
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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 ... When a drive system is selected for grinding applications, a large number of items need to be checked and many questions must be answered. Depending on the mill size and type, the mill can be driven
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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 a flawless execution of the maintenance tasks. Main learning objectives The participants will be able to: — Safely operate the GMD system on a day-to-day basis
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