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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, service-friendly and fit for purpose design to provide highest throughput, reliability .
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Variable speed was required for the SAG mill. Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed, and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER), in conjunction with Wound Rotor Induction motors (WRIM).
Gearless mill drives. The gearless mill drive eliminates ringgear pinion gearbox 64 MW gearless motor is still operating today and is proving to the first GMD for a doublerotating ball mill in Carlin Nevada the poles' excitation via the slip rings to the rotor. Get Price
Energy extraction from natural resources can be quite unpredictable. To be effective you need to be able to control overloads caused by grid variations, torque peaks and mechanical problems. Voith couplings ensure reliability in energy recovery. The Challenges in Energy Extraction Voith manufactures and develops world leading torque limiting
ElectroDrives is manufacturer of solutions for industrial applications of controls and power electronics in medium voltage (1kV-35kV). We are experts in Slip Energy Recovery Drives (SER Drives), Liquid Resistor Starters (LRS), Induction Motors, Reactive Power Compensation, Static Excitation Systems and Harmonics filters.Find out the solutions we provide to our customers for their SAG mills, AG ...
Ball and Sag Mills Cranes Hoists Pumps Fans and Blowers Chippers Conveyors Banbury Mixers With high efficiency ratings that save money over the entire life of the motor, these machines can be designed for voltage requirements ranging from 220 V to 13,800 V and for speeds from 300 RPM to 3600 RPM depending on the horsepower requirements. 50 Hz and 60 Hz ratings are available. Wound Rotor ...
Slip power recovery systems When are Wound rotor motors used ... The slip power recovery (SPR) drive is an external ... listed below: • Grinding mills that require high torque at ... large grinding mills. In fact, until about 1985, a wound rotor induction motor was the ... One dual Slip Energy Recovery .
Yanacocha Gold Single Stage Sag Mill Design Operation And. Gearless mill drive gmd technology has further expanded the use of large agsag milling allowing skd to produce the worlds largest sag mill of 42 in diameter drawing power at 28 mwoday, skd is the world leading supplier of gearless agsag mills operating globallyining industry what is the difference of ball mill.
When mill diameter and mill power became again increased, only the Gearless Mill Drive (GMD) could be envisaged to cover this requirement above 10 MW. The GMD is by its nature a variable speed drive system. Process operators, once having the facility of adjustable speed, could not live anymore without it for SAG mills.
Variable speed was required for the SAG mill. Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed, and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER), in conjunction with Wound Rotor Induction motors (WRIM). This was deemed to be the most cost effective ...
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...
Rotor Drive Slip Energy Recovery: QLD: SAG Mill sub and hyper synchronous speed control and starting with Unistarter LRS. Water: Fuji LV Drives: QLD: Specified drives due to ongoing reliability and locally-based service and support. Mining: Rotor Drive Slip Energy Recovery: QLD: Pump drive and energy recovery. Mining: Transformers: QLD
A slip energy recovery (SER) drive is used to control the mill speed by running at slower than synchronous speeds, therefore rotor current and shaft power are not directly proportional. The site have also identified differences in ball size, trajectory and liners profiles at this point in time.
The flexible Slip Energy Recovery Drive (SER) enhances the tradi-tional subsynchronous SER by increasing the speed range and power while keeping the energy recovery. 3 Imagine the increase of productivity and quality! A big step forward was made by launching the flexible SER, allowing sub- and hypersynchronous operation. The typical speed range of 80 to 115% can be used to achieve the best ...
Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a level structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.
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So the Ball Mill at Frontier was yet again designed with robustness and performance in mind, but the trunnion-supported and high aspect 9.75m (32') diameter SAG mill was the real technical force. The supply of this dual-pinion driven mill with 12MW of installed power included a Hypersynchronous Slip Energy Recovery Drive (Hyper-SER).
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SAG mill grinding process - Gearless mill drives systems - Gold, Slip Energy Recovery Driv, thereby limiting the inrush current Crusher Spares- Spare Parts... know more 16 High Inrush Relays
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SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.
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SAG mill grinding media is added to the ore feed conveyor via a spillage return hopper. Primary grinding is achieved in a dual pinion 13 MW variable speed slip energy recovery/ hyper-synchronous drive 34 ft × 20 ft SAG mill in closed circuit with scats return conveying including a high-lift conveyor to overcome topography constraints. SAG mill ...
The Slip Energy Recovery Drive (SER Drive) is a technology well proven in the industry for large power motoring systems that allows precise motor speed control at the same time that recover the slip energy in the Wound Rotor Induction Motors (WRIM).They are also the dominant technology in wind turbines.
Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive ... comparisons and attempts to dispel some of the myths regarding Slip Energy Recovery (SER) and variable frequency drive technology on ... Mill. In this case the GMD requires slightly less space but it does
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has been selected to design and supply a 42ft x 25ft, (12.8m x 7.6m) 28MW gearless SAG mill, plus two 26ft x 42ft, (7.9m x 12.8m) 15.6MW ball mills and two VTM-1500-WB VERTIMILLS® for Newmont Mining's Yanacocha Conga copper-gold project in Peru.
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...
The flexible Slip Energy Recovery Drive (SER) enhances the tradi-tional subsynchronous SER by increasing the speed range and ... • SAG mills and ball mills in the mining industry, where an increase of efficiency and productivity is desired while availability is maintained
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16-1-2014 · ABB is world market leader in the gearless mill drives (GMD) ... extended life span and improved energy efficiency. ... 2,200 kW - 1,000 rpm slip-ring motor for a cement ball mill - .
Auteur: ABB Schweiz
Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.
Gearless mill drives. The gearless mill drive eliminates ringgear pinion gearbox 64 MW gearless motor is still operating today and is proving to the first GMD for a doublerotating ball mill in Carlin Nevada the poles' excitation via the slip rings to the rotor. Get Price
