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Gearless mill drives Grinding | ABB
The motor is fed by a fuseless cycloconverter that is connected to the MV network through three special cycloconverter transformers Additionally a small excitation converter is required to supply the poles’ excitation viaCycloconverter drives for all applications ABB provides the most suitable cycloconvelter product range for all of the typical applications: rolling mill main drives mine hoistABB
Revolutionary Drive Controller for Gearless Mills ABB
The Cycloconverter is a frequency changer which converts a poly phase voltage with the frequency f1 into a single or polyphase voltage with a different, lower frequency f2 OnAbstract—A cycloconverterfed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operatingGearless Mill Drive Protection Improvements and Its Behaviour at
Mount Milligan mill drives ABB
SAG mill and two 26 ft ball mills, all made by minevik The drive systems that enable the mills to operate at benchmark levels of reliability, efficiency and availability were made by ABB, whose solution comprises a 235 MW gearless mill drive (GMD) for the SAG mill, and two 13 MW lowspeed dualpinion ringgeared mill drive (RMD) systems for theFor economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverterfed drives with powers in the range near 20 MW, 12Pulse connection Twin 6Pulse cycloconverter
(PDF) Technical evaluation and practical experience of
He received the Electronic Engineering degree He has several years consulting experience in the mining industry, especially in 2004 from the Universidad Técnica Federico Santa in the application of large drivesTwo secondary ac synchronized motor coupled to a gear mill, $25 million ball mills, 18x27 drive with an air clutch motor, $602,000 6050 D Primary SAG, 34x1 6 Two vafiable speed dc motors coupled mill, $4 million 22,500 to a gear drive with air clutches motor, $128 million each 6000 Two secondary ac synchronized motors coupled to a gear millMill drive selection for semiautogenous grinding mills
REVAMP AND MODERNIZATION OF GEARLESS MILL DRIVES ABB
for the mill bearings, the mechanical mill brake control and the visualization of all parts of the drive system Figure 1 shows a picture of a ringmotor used in copper concentrators The poles of the rotor are directly mounted on the surface of the mill flange Figure 2 presents the power circuit of a cycloconverter fed synchronous motorSAG mills and about 15 rpm for smaller ball mills Figure 3 Pole mounting during installation of ringmotor Cycloconverter The cycloconverter (Fig 4) belongs to the group of linecommutated static frequency converters, free from circulating current The standard design for 12pulse systems with higher power is fedTECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES
Autogenous and Semiautogenous Grinding Circuits
4 Tumbling Mills •Hollow cylinder, feed one end and discharge from the other •Grinding media can be the rock charge or steel balls (or ceramic beads, shaped steel, etc) AG milling → SAG milling → BAG milling →RoM milling → ball millingspeed of the mill Nowadays GMDs up to 38MW for 42’ ball mills are reported to be in production ADVANTAGES OF GMD 1) About 4% higher energy efficiency can be achieved with gearless drive technology 2) No mechanical limits so high power is available at the driven component 3) Smaller footprint of complete drive trainOVERVIEW OF MV DRIVE TECHNOLOGIES IN MINES AND FUTURE
Conduction state of a 6pulse cycloconverter: (a) During normal
For economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverterfed drives with powers in the range near 20 MWSiemens’ gearless drive technology of 9946 to 9971% as confirmed by real operational data from the Antapaccay mine in Peru It was the first plant worldwide to use gearless drives for both applications KEYWORDS Gearless Mill Drives, Gearless Conveyor Drives, Availability, SAG Mill, Ball Mill, Overland Conveyor, Antapaccay 15Increasing Availability through Advanced Gearless Drive Technology
ABB
SAG, ball and cement mill chives, etc Experience to exceed your demands ABB has experience in cycloconvetter chives, having delivered about one third of the world's cycloconverter power ABB cycloconvelters were used in 1969 for ring motor drives on cement mills and later also with marine propulsion, mine hoist and It)lling mill main drivesFor economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverterfed drives with powers in the range near 20MW For the huge volume of slurry flows, big pumps with lowspeed gearless drives fed by medium voltage converters in the range of 1–2MW are being considered(PDF) Resonance effects, power quality and reliability issues of
Making remote mines and low ore grades economical
Gearless mill drives GMDs offer ore producers including cycloconverter and advanced specific grinding control software ABB was awarded a multimillion contract to provide a 28 MW GMD for a 40 ft (122 m) SAG milldrives MV drives require fewer cables than LV solutions and the efficiency of the complete system is higher due to less current and hence lower losses On the GMDs, where high power and very low speed is required, the cycloconverter is still the most effective and compact drive solution However, on ringgeared mills, where the power isCMP Paper 161009 Final ABB
‘SER’ – Slip Energy Recovery Grinding Mill Speed Control
2020年9月11日· Over the past seven years, there have been approximately 40 projects globally working on installations of energyefficient SER drives With our SAG mill running at 654% critical speed (mill @ 87operating speeds Furthermore, the ball mill gears were severely scored after four months of operation EAnD were commissioned by Cadia to determine the causes of the drive problems and to develop remedial measures [1,2] The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive componentsII100 II101 INTRODUCTION A Boughey Pty Ltd
Cycloconverter Wikipedia
CCVs are used for driving mine hoists, rolling mill main motors, ball mills for ore processing, cement kilns, ship propulsion systems, slip power recovery woundrotor induction motors (ie, Scherbius drives) and aircraft 400 Hz power generation The variablefrequency output of a cycloconverter can be reduced essentially to zeroWhether you’re talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator That’s why we always design our Gearless mill drives drives to combine maximum performance with limited space requirements Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this noticeSIMINE Gearless mill drives
Technical and Commercial Benefits of Gearless Mill Drives For
In Systems for Gearless Mill Drives, SAG Conference, Vancouver addition, the values measured, recorded and collected by supervision systems give valuable input to analyze the status and the condition of [2] Ahrens, M and Gonser, J, 2006, Service and Maintenance for the drive system and its components and therefore to detect potential Gearless MillRingmotor of the Gearless Mill Drive (GMD) System CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a polyphase voltage with the frequency f1 into a single or polyphase voltage with a different, lower frequency f2 On Gearless Mill Drives (GMD), the operational output frequency varies from 03 Hz up toRevolutionary Drive Controller for Gearless Mills ABB