COPPER MOUNTAIN OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION SAG mill ball mill ring gear Mill drive motor size 17 000 HP . ring motor for ball mill arunachallawin. ring motor for ball mill FL ball mill for cement grindingFL ball mill for cement grindingslide ring at either end Mill Motor Gear size Installed motor Size DxL .
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“The motor on our SAG mill is the fascinating part for me,” Hope said. “The mill is its own motor,” Tucker explained. “The mill is what would be considered the rotor in a motor.
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ABB’s contact called for delivery of four dual pinion low-speed mill drive systems for two semiautogenous (SAG) and two ball mills, each consisting of two synchronous motors, converter transformers and ACS6000 frequency converters including active rectifier units that allow the mill drives to achieve a power factor of 0.90 leading.
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Article in IM International Mining, October 2010 Issue Author: Maarten van de Vijfeijken The gearless motor (also called wrap-around motor or ring motor) is a very large synchronous motor. The poles of the motor are directly installed on a pole flange on the mill shell: this means the mill body becomes the rotor.
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The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)
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Why using a starter for slip ring motors. In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting torque. Higher is the inertia, higher has to be the accelerating torque, otherwise the start will be very long and the motor can be damaged by the heating. If the motor is started directly
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Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop
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The standard inching drive motor is a NEMA or IEC frame typically foot mounted to a motor scoop or base plate. Typical motor speeds are either 4 or 6 pole, i.e. 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or 970 rpm for 50 Hz applications. The advantage of using a four pole motor allows for a smaller footprint and a smaller brake if
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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 power large semi-autogenous (SAG), ball and autogenous mills, but GMDs are proven to offer superior availability, uptime and efficiency. Change Management and Operational Readiness.
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SAG Mill Shell Ø10,97 x 5,79 m 176 t Foto Outotec SAG Mill Shell Ø6,7 x 3,35 m 36 t Foto Outotec Ball Mill Shell Ø5,2 x 7,32 m 54 t Foto Outotec Ball Mill Shell Ø5 x 8 m 64 t Foto Outotec Mill Shell Ø5,5 x 2,5 m 16 t Foto Polysius SAG Mill Shel Ø7,9 x 6,598 160 t Foto PSP PREMILL PM 1400 47 t Foto PSP
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Grinding and processing. WEG offers the most reliable and efficient solutions for milling plants for ferrous and non-ferrous products with their experience of mill drive systems. In the heart of a processing plant, the ball and SAG mills must be driven by solutions that adapt to the characteristics of the minerals in line with the whole process.
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A very basic overview, but the advantage of wound rotor slip ring motor is that, through a LRS u can vary the resistance of the rotor. The advantages are 1. able to manipulate the torque speed curve, allowing u start with a much higher torque. Wound motors are suitable for application with heavy starting duties such as ball/sag mills, crushers etc.
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SAG Mill Design and Specification . The original SAG mill control loop, a mill motor power draw set point of 5200 Amperes controlling the coarse ore feeder speeds, was soon found to give excessive variation in the mill ore charge volume and somewhat less than optimal power draw. The open trunnion bearings are sealed with a rubber ring
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SAG mill. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42'' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.
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Grinding and processing. WEG offers the most reliable and efficient solutions for milling plants for ferrous and non-ferrous products with their experience of mill drive systems. In the heart of a processing plant, the ball and SAG mills must be driven by solutions that adapt to the characteristics of the minerals in line with the whole process.
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SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of
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Ring Motors vary the speed of the mill by changing the sta-tor frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation. Figure 1: Ring Motor of the 38’ SAG-Mill of Rio Paracatú Mineraçao; Brazil 3 Design Verification To assure reliability of operation the mechanical design must be verified.
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Slip ring motors are the motors of choice whenever high starting torque or low starting current are required. They are especially suitable for heavy load inertia applications. Already since 1927, we are a global manufacturer, supplier, and distributor of large slip ring motors up to 8000 kW and 13800 V.
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ABB’s contact called for delivery of four dual pinion low-speed mill drive systems for two semiautogenous (SAG) and two ball mills, each consisting of two synchronous motors, converter transformers and ACS6000 frequency converters including active rectifier units that allow the mill drives to achieve a power factor of 0.90 leading.
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SAG MILL ACE 8 SUCCESS STORY: ANTOFAGASTA PLC Set points Process information Set points and outputs Process and / or disturbance variables Valve, motor, and control signals Process measurement BrainWave is patented predictive technology that is capable of controlling multiple variables while conside-ring the effect of each adjustment on
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(SAG) mill, ball mill, and crusher. A ball mill is a slightly inclined, horizon-tal rotating cylinder, partially filled with ceramic balls, flint pebbles or stainless the ring motor. This allows for continu-ous analysis of the system status and the ability to inform the customer in a
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Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that
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SAG Mill Design and Specification . The original SAG mill control loop, a mill motor power draw set point of 5200 Amperes controlling the coarse ore feeder speeds, was soon found to give excessive variation in the mill ore charge volume and somewhat less than optimal power draw. The open trunnion bearings are sealed with a rubber ring
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ABB commissions gearless mill drive system at Peru’s largest gold mine. 09 June 2008. ABB announced it has successfully completed commissioning of a 16.5 MW gearless mill drive (GMD) system for a SAG (semiautogenous) mill at Minera Yanacocha. The mine, located in Cajamarca, Peru, is the largest gold producer in Latin America.
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• Slip Ring Motor Rewinds & Repairs • Relay & Contractor Coil Rewinds • Sag mill and ball mill motors grader, dozer and scraper traction motors, alternators and auxiliary motors • Underground mining motors. ON-SITE SERVICES. Test, disconnect and removal of rotating machinery • Condition monitoring • Laser alignment
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SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of
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For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.
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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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26 x 14 ft (7.9 x 4.2 m) SAG Mill 6,300 HP (4700 kW) Motor. 26 x 14 ft (7.9 x 4.2 m) SAG Mill 6,300 HP (4700 kW) Motor Variable speed drive available at extra cost. Mill includes:
SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3. Figure 2 – Example motor power available as a function of motor speed 0 0.925 1.85 2.775
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Ring motors are much more complex than grinding mills and the simple remedies offered in the paper would not have avoided most of the past failures. It is shown that external influences and design culture were the root causes of most of the ring motor problems since 1996 and the problems in design culture also exist in some mill vendor design
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