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... 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 of about...
A detailed evaluation of a SAG mill starting is presented using three different modeling options. The first option considers a qd0 model of the two-stator winding synchronous motor fed by two six-pulse cycloconverters. The second option considers the qd0 model of an equivalent one-stator winding synchronous motor fed by a 12-pulse cycloconverter. …
For economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverter-fed drives with powers in the range near 20. MW.. For the huge volume of slurry flows, big pumps with low-speed gearless drives fed by medium voltage converters in the range of 1–2 MW are being …
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 link.The 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 …
Key Differences Between Stator and Rotor. The stator is the stationary part of the machine, whereas the rotor is the movable part of the machine. The stator core, stator winding and the outer frame are the three parts of the …
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.
WebAbstract: Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30 shift between the two …
• 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
The rotation speed of a mill is an important factor related to its operation and grinding efficiency. Analysis and regulation of the optimal speed under different working conditions can effectively reduce energy loss, improve productivity, and extend the service life of the equipment. However, the relationship between the optimal speed and different …
are being applied for semiautogenous (SAG) mills and re-cently, ball mills are also being considered. ... Fig. 3, Ring motor with 2 separated stator windings [22]. Measurement
Typical drive configurations of high-capacity SAG mills uses a two-stator windings vector controlled synchronous motor, with 30º shift between the two windings, fed by a two secondary's delta-delta-wye power transformer and two 6-pulse cycloconverters. Paper presents and evaluates three different modeling options for the SAG mill drive. First …
Siemens
Slip Power Recovery Drive System for a grinding mill SAG Mill and Motor The Best Solution: TMdrive-10SPR for each pump • The SPR drive carrying slip power is much smaller and less expensive than an MV drive carrying all the motor power at full speed (4 kV voltage) • The SPR drive has a smaller footprint than a large stator supply drive
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two Three–Phased Cycloconverters. The rotor has salient poles without dumping windings and it consists of 72 poles. The cycloconverters work in the out-of-circulation current mode and they are connected to a 13.6 MVA …
... Hence, the proposed estimation algorithm is based on a combination of current and voltage models for flux and torque estimation [18], [19]. In addition, the …
Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly long-time outages, are of great benefit. This paper presents the development of phase and qd space vector models of the 2-stator winding synchronous motor used in SAG mill drives. Using a space vector rotation …
Abstract: Typical drive configurations of high-capacity SAG mills uses a two-stator windings vector controlled synchronous motor, with 30º shift between the two windings, fed by a …
surface of the mill flange. Typically, the synchronous motors used in 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
The rotation speed of a mill is an important factor related to its operation and grinding efficiency. Analysis and regulation of the optimal speed under different working conditions can effectively reduce energy …
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...
A detailed evaluation of a SAG mill starting is presented using three different modeling options. The first option considers a qd0 model of the two-stator winding synchronous motor fed by two six ...
There are two GE motors for SAG mill but unfortunately sometimes current draw exceeds more than 300 A in one of them and makes SAG mill shut down. I was not sure about process issues. ... it may well be that one of the motors has insulation problems on windings in either rotor or stator, or other issues that are influencing its performance ...
Get more done at a lower cost with higher throughput. Easily find the perfect fit from our wide range of sizes. Depend on years of proven reliability and productivity. Products. Maximise the productivity of your operation with durable high-efficiency Semi Autogenous Mill (SAG mill) and Autogenous Mill (AG Mill).
• 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful ...
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 two-stator winding …
autogenous grinding (SAG) mills, or ball mills. The most important components of a GMD are the following ones: The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names "wrap-around motor" and "ring motor" (see Figure 1). Its purpose is to
A detailed evaluation of a SAG mill starting is presented using three different modeling options. The first option considers a qd0 model of the two-stator winding synchronous motor fed by two six-pulse cycloconverters. The second option considers the qd0 model of an equivalent one-stator winding synchronous motor fed by a 12-pulse …
Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly long-time outages, are of great benefit. This paper …
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