The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor for the 38 ft SAG mill had not failed. It too had an ABB motor and it had operated longer than the Collahuasi motor.
WhatsApp: +86 18838072829Abstract: Typical drive configurations of highcapacity SAG mills use a twostatorwinding vectorcontrolled synchronous motor, with a 30 ^{circ} shift between the two windings, fed by a twosecondary deltadeltawye power transformer and two sixpulse cycloconverters. This paper presents and evaluates three different modeling options for the SAG mill drive.
WhatsApp: +86 18838072829This video shows the typical motor stator lamination and motor stator stamping manufacturing process with progressive die stamping, the progressive die stamp...
WhatsApp: +86 18838072829Mine operators are challenged with moving more material on conveyors that may cover distances in the tens of kilometers and ascend steep gradients. To increase overall reliability, mining companies also want fewer transfer stations between conveyors, which may require wider and longer belts. To meet these increasing demands, ABB developed low ...
WhatsApp: +86 18838072829Excellence Technical Skill In High Voltage Electric Motor Rewinding | Super Large Motor And Stator Rewinding a giant electric motor is a complex proje...
WhatsApp: +86 18838072829The ball mills, the second stage grinding equipment, are in diameter and long, each with two 7800 kW motors. 52 magnetic separators are used in each of the processing lines. Two concentrate thickeners, each 45m in diameter and four tails thickeners each 90m in diameter. Four dewatering buildings, each containing seven press filters.
WhatsApp: +86 188380728291 x MW gearless mill drive system (GMD) to power the 40 ft SAG mill ; ... The logistical challenge of transporting the large GMD stator to site via the unpaved access road, was solved through a design change in the stator. Normally engineered and designed to be transported in 4 pieces, this stator was engineered in 5. ...
WhatsApp: +86 18838072829Power circuit of synchronous motor with two stator windings fed by a 12pulse cycloconverter. ... "Remedial design of the world's largest SAG mill gearless drive," International Conference on SAG ...
WhatsApp: +86 18838072829The electric operation and design features of the 11,000 variable speed SAG mill gearless drive is presented. The function of the frequencyconverter, control system drive and lubrication systems are described.
WhatsApp: +86 18838072829The stator coil excitation (or the initial rotor position) needs to be adjusted such that a maximum amount of torque is applied to the rotor. In order to do so, the rotor is given an initial angular displacement. The rotor angle alpha is varied over an angular span of one rotor magnet, and the average torque is calculated. The value of initial ...
WhatsApp: +86 18838072829The whole stator bar is "VPIed" including the slot section and the winding overhang. Figure 1 Intertwined "Roebeled " bar with transposed strands and full VPI bar ... SAG Mill Figure 2 Core pressing system with spring plate/washer and retightening statistics in a typical installation
WhatsApp: +86 18838072829Request PDF | Modeling and Evaluation of CycloconverterFed TwoStatorWinding SAG Mill Drive—Part I: Modeling Options | A detailed evaluation of a SAG mill starting is presented using three ...
WhatsApp: +86 18838072829Ball mill upgrade at Collahuasi increases processing capacity by %. The upgrade was achieved without safety incidents in 71 days, 13 days ahead of the initial schedule. It involved changing the rotor, GMD system stator and redesigning the mill discharge to achieve an increase in both available power and the level of filling required to treat ...
WhatsApp: +86 18838072829A detailed evaluation of a SAG mill starting is presented using three different modeling options. The first option considers a qd0 model of the twostator winding synchronous motor fed by two sixpulse cycloconverters. The second option considers the qd0 model of an equivalent onestator winding synchronous motor fed by a 12pulse cycloconverter. The third option considers the equivalent one ...
WhatsApp: +86 18838072829Mill Components Read online for free. Scribd is the world's largest social reading and publishing site. Open navigation menu. Close suggestions Search Search. ... This makes the mill essentially a part of a synchronous .motor rotor with the stator in its usual position around the rotor.
WhatsApp: +86 18838072829mill drive is in inching mode, one rotation of the mill is all you need. The mill will reach the exact angle that was preset by the operator, and the procedure does not need to be repeated. At the end of the inching operation, the SIMINE Gearless mill drive stops the mill with balanced charge, and with no timewasting creep
WhatsApp: +86 18838072829In October 2007 the first failure of SAG stator occurred. This caused a concentrator plant shutdown for several days, ... This option was built in 2009, with the consideration that in 2012 the stator on the SAG Mill would be changed, shutting down the mill for 45 days.
WhatsApp: +86 18838072829SAG Mill 1011 operation (40 x 22 feet, the largest copper SAG mill of the world), to a fully automatic SAG Mill using a multivariable control strategy instead of a rule based on expert
WhatsApp: +86 18838072829The SAG mill ball charge used to perform the simulations was 15%. When the SAG mill is being underfed, and hence the throughput is relatively low, the kWh/t is relatively high. As throughput is increased the rock load builds in the mill, though its influence on the power draw is relatively small and disproportionate to the throughput increase. ...
WhatsApp: +86 18838072829The stator currents and and the voltages and are measured and used in model M1 (voltage model) to calculate the magnitude and position of the flux. ... The grinding circuit includes a variable speed SAG mill of 12 MW with two fixedspeed ball mills with where is the frequency of the harmonic and and are synchronous motors of MW each. In ...
WhatsApp: +86 18838072829Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly longtime outages, are of great benefit. This paper presents the development of phase and qd space vector models of the 2stator winding synchronous motor used in SAG mill drives. Using a space vector rotation transformation, the two ...
WhatsApp: +86 18838072829