Jan 09, 2019· The reliability of large diameter, high horsepower ball mill is paramount when large production and minimum downtime is required The 17 ft x 56 ft double compartment ball mill at St Lawrence Cement Company has the first gearless drive built in North America and has the world’s largest hydrodynamic bearings currently built and running
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Gearless Drives for Ore Conveying and Grinding - Cmms Fig 4 Air gap monitoring system in a gearless drive Gearless Drives for grinding mills Gearless Drives are well proven stateof- the-art technology for large grinding mills Siemens, the company that introduced Gearless Mill Drives (GMD) to mining industry started up
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Feb 18, 2013· The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball mills were also fitted with gearless drive systems, each providing 164 MW
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Gearless mill drive system - Page 1 of 1 Andina contract awarded to ABB ABB has won a three-year service agreement from Codelco to maintain and optimise the installed gearless.
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Sep 13, 2006· Simine Mill GD provides a gearless drive with no mechanical parts between the motor and the mill Stepless adjustment of the rotational speed aids optimum start-up and means that the system can be controlled in accordance with the varying demands of the material in the mill This reduces wear, maintenance and energy consumption
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Table 1) SAG mill drive systems used on the same size grinding mill: Cupitul cost fixed speed ac synchronous drive In calculating the NPC, the capital complete with ring and pinion gears; cost in US dollars for each SAG mill variable speed dc drive complete system was determined Although the with ring and pinion gears; ringmotor gearless drive
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Jan 25, 2022· ABB has released a new version of ABB Ability Predictive Maintenance for grinding which is a unique advanced digital service to maintain, assess and analyze gearless mill drive (GMD) systems The upgrade means that ABB Ability Predictive Maintenance for grinding is now cloud-based instead of sited on premises and includes a brand-new mobile application that ,
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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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May 25, 2021· A gearless mill drive is a major investment for a plant and as the beating heart of the production process is essential Thus, having knowledge of how to make most of your GMD is crucial The following advanced digital service can enable optimized productivity at ,
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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%
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Jul 08, 2014· GMD technology for Minera Escondida ABB gearless mill drive, installed 2002 at the Minera Escondida in Chile ABB announced that it will supply a new 157 MW gearless mill drive (GMD) system for a 26 ft ball mill, including transformers, ring motor and a complete electrical room entirely equipped, to Minera Escondida/Chile
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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 .
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Gearless mill drive system (GMD) Maximum availability and productivity Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations
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Feb 21, 2019· https://newabb/mining/grinding/gearless-mill-drives | ABB ensures maximum throughput, highest availability and peak performance throughout the life cycl.
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Gearless mill drives - Grinding ABB 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 .
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CHH624 Gearless Mill Drive Operation and Maintenance CHH624 Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in-formation on safe operation and maintenance of the gearless mill drive GMD system
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Abstract—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 failur For demanding applications in the mining industry, protections systems need to be reviewed
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Gearless mill drives are becoming the drive system of choice on large AG, SAG and ball mill installations for new projects and existing mill expansions At least 31 GMDs have been ordered from Siemens and ABB, for example, over the past year or so for mills ranging up to 40 ft in diameter and with drive power ratings up to 28 MW
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Jan 27, 2022· Grinding app for gearless mill drive systems SWEDISH-Swiss automation company ABB has revamped its ability predictive maintenance for grinding platform, which maintains, assesses and analyses gearless mill drive systems, with a cloud-based app allowing mine operators to check gearless mill drive performance from anywhere on their ,
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Jan 07, 2022· 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%
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Jul 08, 2014· Gearless mill drive system in iron ore processing ABB was recently contracted to supply gearless mill drive (GMD) systems for two 38 foot semiautogenous grinding (SAG) mills at the Serra Azul iron ore mine in Brazil ,
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Jul 08, 2014· Gearless mill drive system in iron ore processing ABB was recently contracted to supply gearless mill drive (GMD) systems for two 38 foot semiautogenous grinding (SAG) mills at the Serra Azul iron ore mine in Brazil The Serra Azul mine unit, owned by MMX Mineração e Metálicos, an EBX Group company, is located in the iron quadrangle of .
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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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Jul 30, 2013· The GMD eliminates all mechanical components of a conventional mill drive system By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor
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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 Vibration-free, low-weight, short-circuit- proof design with high stiffness
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The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability 3 Competence in grinding For many decades, ABB's optimized mill drive solutions have consistently set new productivity
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Nov 17, 2009· ABB announces that it has won an order for the first gearless mill drive (GMD) system ever to be installed in an Indian manufacturing plant The order was placed at the end of October, by the Indian cement manufacturer Lalitha Cement Ltd (LCL), located in Hyderabad, the capital of the Indian state of Andhra Pradesh
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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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Sep 04, 2001· RE: Protest 2809-00-100025; Gearless Mill Drive Dear Port Director: This is our decision on Protest 2809-00-100025, filed against your classification, under the Harmonized Tariff Schedule of the United States (HTSUS), of parts and components of a ,
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The $12 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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