The stator also exhibited excessive static or mean deflections that reduced as a function of speed from a maximum of 7 mm during inching to 3 mm at near full speed. These problems effectively reduced the drive airgap to less than half the nominal value. ... The SAG mill is usually the rate limiting process stage in plant upgrades. Plants based ...
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Context 1 ... production of fine powder is efficiently done in semiautonomous grinding (SAG) mills. Fig. 1 shows the construction of a SAG mill [2]. It consists of a rotating hollow cylinder...
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Context 1 ... production of fine powder is efficiently done in semiau tonomous grinding (SAG) mills. Fig. 1 shows the construction of a SAG mill [2]. It consists of a rotating hollow cylinder...
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SAG 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
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Paper held at SAG Conference 2011 By S. Gaulocher (ABB), Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) mills and large ball mills.
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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 ...
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1. Introduction. Grinding is an industrial process that accounts for a large proportion of the mineral processing industry [1], SAG mill is the main mining equipment in this main working device of the SAG mill is a drum that is placed horizontally and can be rotated, the lifters are provided on the inner wall of the drum that includes the cylinder face and the end faces on both sides.
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Abstract: A 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.
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A 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 six ...
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The phasing is conducted by connecting a 3 phase supply to the motor stators (nominally 415V) with the rotor connections open circuit to facilitate voltage measurement. ... There are many paper talking about SAG mill optimization that can give you clue how the process data changes the power draw. Bob Mathias. 8 years ago. Bob Mathias 8 years ...
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Hence, 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 ...
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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, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant. eBook: Grinding transformation
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Excellence Technical Skill In High Voltage Electric Motor Rewinding | Super Large Motor And Stator Rewinding a giant electric motor is a complex proje...
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Sag Mill Full Rewind CHILE. Ball mill Rewedge Line 1 AUSTRALIA. Ball mill Rewedge Line 2 AUSTRALIA. ... 300mw Turbine stator repair BELGIUM. x. 60mw hydro rewind restack USA. x. Top bar replacement Toshiba 450mw AUSTRALIA. x. Minor repair sliprings700mw Alstom generator MALAYSIA. x.
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ABB recently announced that rewinding of a SAG mill stator at Chile's Minera Escondida—the world's largest copper mine—was successfully completed, marking the first time in 40 years of gearless mill drive (GMD) history that the company has performed a stator rewind onsite. ABB also reported that it had received a 19million, three ...
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The maximum DFIG mechanical power reduced to MW instead of MW in normal conditions due to the voltage sag. While the maximum stator power reduced to MW instead of 2 MW. The stator ...
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In June 1998, the world's largest grinding mill, the 40 ft ( m) diameter 20 MW Cadia gearless SAG mill, was commissioned. This was a leap of over 40% above the largest operating SAG mill. ... requirements of displacement control on the mill/rotor structure, and on the stator structure. Design Concepts vs. Size for the Cadia Mill 3. ...
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The Ringmotor stator is supported on the floor or on concrete pedestal and the rotor poles are mounted on the mill flange (the rotor is the mill itself). To prevent the rotor from touching the stator, the air gap level is supervised on the stator with 12 sensors mounted around the stator circumference.
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Mill drive example An example of slip power recovery is the wound rotor motor shown below, one of two for powering a new 10,000 kW SAG mill in Australia as shown in Figure 3. This installation includes: • Two 5000kW sixpole WRIMs with 11,000v stators • A combining gear box driving the mill • One 10,000kW liquid resistance starter (rheostat)
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The mill is a scaleddown replica of a commercial Koppers m x m (20 ft x 7 ft) SAG mill (see Fig. 1). The original design was developed by Vanderbeek and Herbst and was constructed by the Scale Model Makers of Cleveland, Tennessee. It is built of plexiglas and therefore allows the observation of the action inside the mill. The ...
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Advantages of the wound rotor/SER drive are: 1. If the SER converter drive fails, the drive can be switched to fixed speed bypass starting the usual way with the LRS. 2. The converter only needs to be sized for 1520% of the total motor rating with associated reduction in floor space, airconditioning etc. The converter is only sized for the ...
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Cadia GMD Stator: Preface. admin 2 October 2014 Cadia. The remedial design of the stator of the gearless mill drive (GMD) of the 40 ft SAG mill at Cadia Hill was the project that defined the success of EAnD and the careers of its two engineering managers, Bill Lai and Chris Meimaris. The Cadia work led on to many other projects including some ...
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The 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 ...
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• A Squirrel Cage Induction Motor is the most common 3 phase motor found in a mill or plant. It is both rugged and simple in design, making it both economical and reliable. • The SCIM has 2 basic components, a stator (the stationary component) and a rotor (the rotating element). In addition, a motor has bearings that allow the rotor to freely
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general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.
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[Show full abstract] 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 ...
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A 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 ...
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GMD for the world's first 42' SAG mill for the Minas Conga oxide gold copper project in Peru. There are numerous GMD projects for 40' SAG mills in the pipeline for the near future, as well as ... already installed mill. For example, one stator segment of Toromocho's 28 MW SAG mill GMD has transport dimensions of SOME x x m ...
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Typical drive configurations of highcapacity SAG mills uses a twostator windings vector controlled synchronous motor, with 30º shift between the two windings, fed by a two secondary's deltadeltawye power transformer and two 6pulse cycloconverters. Paper presents and evaluates three different modeling options for the SAG mill drive. First option considers a complete model in phase and qd0 ...
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For this expansion project, Kinross selected ABB to provide a 26 MW gearless mill drive system (GMD) for the mine's 40 ft SAG mill, as well as other drives, electrical infrastructure equipment and a longterm service agreement (LTSA). Joel Desmeules, Construction Manager for the SAG mill, at Kinross. "We are pleased with the ABB team's ...
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A SAG mill has low speed and heavy load, which cause the energy consumption of grinding operation to be very high. ... TwoStator Windings SAG Mill Drive. Part II: Starting Evaluation. IEEE Trans. Ind. Appl. 2014, 51, . [Google Scholar] Castro, ; Valenzuela, Space Vector Modeling of a SAG Mill Drive and Evaluation during ...
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