Grinding and processing. WEG offers the most reliable and efficient solutions for milling plants for ferrous and nonferrous products with their experience of mill drive systems. In the heart of a processing plant, the ball and SAG mills must be driven by solutions that adapt to the characteristics of the minerals in line with the whole process.
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Benshaw's Solution. Working with a long time customer and local Benshaw partner in the motor controls industry, Benshaw has successfully applied a 480VAC 700 HP AC variable frequency drive for positioning a medium voltage synchronous motor driven ball mill. The variable frequency drive powers the 4160Volt 3500HP synchronous ball mill ...
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Context 1 ... section presents an example of the demodulation of a signal measured on a gearbox casing of a ball mill.. The investigated stand consists of a 5 kV, threephase induction motor...
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When using a synchronous motor we recommend having 200% starting torque, 120% to 130% pullin torque, and 225% pullout torque. These assume no greater than a 10% voltage drop at the motor terminals. VBELT Ball Mill DRIVE Vbelt or polyV drives are generally used on grinding mills consuming 350 HP or less.
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Energy savings may also be found in the ball mill drive systems. In the scale of a processing plant, the electric motors of these drive systems account for 95% of the total electric energy demand [23]. Therefore, the type of the motor used has a significant influence on the efficiency of the drive system. One of the solutions aimed at improving
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after which everything is ready to drive the mill. Once the "variable speed solution" is chosen, an important decision to be made by the operator is left referring to the motor: whether to opt for a high speed or low speed solution. Gear driven mills can be motorized both with the high speed solution or the low speed solution.
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motor is prescribed and carried out by each drive and motor set. Identifying Load Sharing Applications The first step in addressing the needs of an application with multiple motors is to determine if the motors are required to work together to share the load. Load sharing involves multiple motors and drives powering the same process. Each drive and
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Created Date: 2/1/2005 3:50:28 PM
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Motor The GMD is a drive system without any gear where the transmission of the torque between the motor and the mill is done through the magnetic field in the air gap between the motor stator and the motor rotor. The concept to drive the mill this way is relatively simple using the mill body as motor rotor and mounting the poles there.
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Sections (n — 1) and n of such a multimotor drive arc shown in Fig. (b). Section n is coupled to Section (n — 1) by clutch C n1, and so on. A suitable Closed Loop Speed Control of Multi Motor Drives scheme is shown in Fig. (a). It consists of one common outer speedloop and one inner torque control loop for each section.
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Ball Mill Motor Drive Schemes Minig Machine. the mill used for this comparison is a 4 4meter diameter by 13 6 meter long ball mill with a 5000 hp drive motor it is designed for approximately 90 s ton per hour this type twocompartment mill is a state oftheart shell supported cement finish mill the torque and time requirements of the mill.
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The article substantiates the expediency of using a controlled electric motor in grinding mechanisms in electric drives instead of an unregulated asynchronous motor. The problem of facilitating the startup of ball mills and ensuring accurate stop of the neck of ball mills using the lowest speed is considered.
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Cement plant motor up to kV and 25 MW. Cement plant motor manufacturing is one of our main product focuses. Cement mills, fans, shredders in the production of cement, particularly large and efficient motors are required for the most diverse processes. MENZEL offers individual motor solutions for all applications in the cement industry up ...
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The time has come to rethink the approach to mill drive motors because of the growth in size of newer ball mills, the starting torque restrictions of some of the newer mill drive configurations ...
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system, and blending these into the overall scheme of assessment. Then the significance of the efficiency and energy requirements should be revealed. Comparison between girth gear drive and central drive. =;='I Example : Ball mill 9000 HP Motor speed 990 rpm Mill speed 14 rpm R/L ill diameter 5 m Mill bearing 22 m
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The main part of the ball mill mainly include feeding part, discharging part, a rotary part, a transmission part (reducer, small gear, motors, electrical control) and other parts. Hollow shaft adopts steel castings, the liner is detachable, slewing gear hobbing with casting, the cylinder body with wearresistant liner, with good resistance to wear.
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26 Technical Data Considerations about cooling of jacket With the bearing arrangement shown in Figs. and, comprising a doublerow cylindrical roller bearing and an angular contact ball bearing for bearing an axial
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The Benshaw variable frequency drive powers the 4160v synchronous ball mill motor during positioning to smoothly rotate the ball mill, providing full torque at zero speed to start and rotate the mill during the positioning process. The use of a drive also provides speed adjustability to a maximum speed of 6Hz.
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Working with a long time customer and local partner in the motor controls industry, Benshaw was able to solve this problem by applying a 480VAC 700HP AC variable frequency drive. The Benshaw VFD powers the 4160 volt 3500HP synchronous ball mill motor during positioning to smoothly rotate the ball mill and bring it to the proper position for ...
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MMC JSC, the operation of a ball mill electric drive with a new two speed motor of the AIR225M10/4 type was studied in the followi ng modes: start up, oper ation
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The motor is usually fitted with a variable speed drive (VSD) to control the rpm of the ball mill. Gearbox used for speed reduction from the motor to the ball mill. Balls usually manufactured from manganese alloy steel, but the material depends upon for what material the mill will grind ( chrome steel alloy and rubber also available).
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Induction Motors [2]. Figure 3 shows a ball mill with a dual pinion drive 2x 6500 kW with low speed induction motors (LSIM). The dual pinion drives demand tight tolerances in the torque between the two motors [2] to dynamically equalize the load on both pinions so that, in the long run, their duration is secured and the system availability
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Rejection of invention patent application after publication. The invention discloses a kind of annular permanent magnet gearless ball mill direct driving motor, belong to ball mill and drive equipment technical direct driving motor includes stator and rotor, and wherein, rotor is fixedly mounted on the outer surface of ...
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Gearboxes are frequently used in the mining industry, especially for power transmission between the electric drive and the ball mill; besides the extreme complexity of a ball mill gear transmission system, the fault diagnosis by vibration analysis can be easily distorted by the presence of impulsive noises due to the ball pulses on the mill shell. Although several works in the literature are ...
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The typical mechanical inching drive motor speed is around 1500 to 1800 RPM while the mill inching speed is in the order of to RPM. Thus, the gear reduction ratio between the inching drive motor and the mill is roughly 12,000 to 1. What this means is that the inching drive motor must turn 12,000 times to be able to turn the mill once.
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These mills typically grind ROM ore in a single stage. A large example of such a mill was converted from a singlestage milling application to a semi autogenous ballmillcrushing circuit, and the application is well described. This refers to highaspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge.
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Mill application features. Frozen charge protection Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Standstill detection Prevents the motors from restarting if the mill is still rocking or moving after a stop ...
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For a mill motor rated at 5000kW, running at 80 per cent speed, the power saving using the SPR drive, Case 3, is 970kW. Assuming two motors as in the 10,000kW mill example, and an electricity cost of 7¢/kWh, the annual savings are US1,189,600. The savings with the MV PWM stator drive are a little less than the SPR case. Note that the lost,
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A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power. The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how ...
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Also, voltage variations can cause an increase in the motor power input. Gearless ball mill drive. The gearless ball mill drive has been established in mill construction since 1969. Large ball mills are directly driven by low frequency electric motors without a speed reducing gear between the motor and the mill and without girth gear and ...
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Ball mill with Central Drive Mill length Mil l diame te r M il l di amet er 5 3 2 3 2 1 3 5 6 6 4 4 Ball mill with Sid e Driv 1 Inlet 2 Outlet casing 3 Slide shoe bearing 4 Main gearbox 5 Mill motor 6 Auxiliary drive 1 3 Ball mill for cement grinding 3 Cement grinding taking on the tough tasks Cement ball mills have to achieve the desired ...
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The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. ... The difference between the measured stresses at Telfer and Antamina is that the liners in the Telfer ball mill had been wedged by ball ...
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3. Analysis of Variant Ball Mill Drive Systems. The basic element of a ball mill is the drum, in which the milling process takes place ( Figure 1 ). The length of the drum in the analyzed mill (without the lining) is m, and the internal diameter is m. The mass of the drum without the grinding media is 84 Mg.
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