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gmd sag mill slip energy recovery

gmd sag mill slip energy recovery

gmd sag mill slip energy recovery - WTM alogue 2012 by Event is a digital publishing platform that makes it simple to publish magazines, alogs, newspapers, books, and more online. Gearless Mill Drive Sales Rev Up to Meet

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SER DRIVE

Since Slip Energy Recovery Systems only handle a small portion of the total power (typically around 15% of the motor power), they are the best option for large motors as the difference in energy consumption quickly recover the investment. Hypersynchronous speed. SER Drives are capable to run motors beyond the rated speed without loss of torque compared to a VSD that it has to reduce the

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Slip Energy Recovery Drives (SER) Australia CSE Uniserve

The CSE Uniserve Rotor Drive Slip Energy Recovery System (SER) is designed for reliable and repeatable mill starting and speed control and to return all unused energy into circuit below when operating 100% speed. It exclusively offers operators full torque at hyper synchronous speeds. Typical applications include mills, crushers, fans and pumps.

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Grinding Mills Gmd Phumlani Lodge

BINQ Mining > Mining News > sag Print. sag mill gmd how does it work. Posted at:November 7, 2012 AA SPEC 323003 GMD GRINDING MILLS AND Get Price; grinding mill maintenance . Grinding work and maintenance for rails GoldschmidtThermitGroup. Our range of grinding services includes the grinding of new rails where mill scale and damage Get Price; maintenance on grinding mills

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Slip Energy Recovery of an Induction Motor Circuit Globe

18/04/2018· Slip Energy Recovery is one of the methods of controlling the speed of an Induction motor. This method is also known as Static Scherbius Drive. In the rotor resistance control method, the slip power in the rotor circuit is wasted as I 2 R losses during the low-speed operation. The efficiency is

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MOTOR TECHNOLOGY Saving energy TMEIC

two for powering a new 10,000 kW SAG mill in Australia as shown in Figure 3. This installation includes: • Two 5000kW six-pole WRIMs with 11,000v stators • A combining gear box driving the mill • One 10,000kW liquid resistance starter (rheostat) • One dual Slip Energy Recovery system (SPR drive). PWM SPR equipment An example of a SPR drive and control cabinet line up is shown in Figure

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TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

Options for variable speed are DC motors, energy recovery systems for wound rotor motors and frequency converter drives. Improvements in power electronics technology and controls have resulted in variable frequency converters that offer high efficiency, high reliability and availability at competitive cost. The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a

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Preprint 13-050

SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at Escondida 13.4MW, which began operation in 1995. The reason for not having larger gear drives was due to the limitation of gear manufacturers not having access to larger single piece special alloy castings. To the benefit of

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Gearless mill drives Grinding ABB

Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. The motor is fed by a fuse-less cycloconverter that is connected to the MV network through three special cycloconverter

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Mining Grinding and Processing WEG

For ball and SAG /AG mills with a single or double pinion, motors with squirrel cage rotor are normally used when constant speed and low starting current are required. WEG induction motors (Master Line) are designed with air cooling system (totally enclosed air-air cooling) or water cooling system (totally enclosed air-water cooling), high efficiency and reliability and separate slip ring

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siemens/mining Flexible Slip Energy Recovery Drive

The flexible Slip Energy Recovery Drive (SER) enhances the tradi-tional subsynchronous SER by increasing the speed range and power while keeping the energy recovery. 3 Imagine the increase of productivity and quality! A big step forward was made by launching the flexible SER, allowing sub- and hypersynchronous operation. The typical speed range of 80 to 115% can be used to achieve the best

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GEARS & DRIVES IRevival of the GMD in cement

installation of a 40ft, 28MW SAG mill GMD and two 28ft, 22MW ball mill GMDs at Toromocho (Minera Chinalco Peru) at the unprecedented height of 4600m above sea level. by Matthias Neurohr, ABB Switzerland Ltd IRevival of the GMD in cement Mr P Subba Raju, MD Lalitha Cement, and Abdellah Nahdi, senior sales manager ABB

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Peter Warner Expert Consultant Martec LinkedIn

The first 40’ GMD, on a SAG mill in Australia, failed due to “sub harmonic resonance”. Engineers are aware that a harmonic of an excitation may excite a system into harmful resonance. However, sub harmonic excitation of resonance is less known. This paper reports on an investigation of this failure and construction of a simplified Simulink® model in MATLAB® that was able to demonstrate

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Didipio SDG

This gold mine installed Mill Safe Start Systems on both their Ball and Sag mills. The Sag mill switches over to a Slip Energy Recovery Drive after start-up.

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How the Modern SER Drive boosts grinding CSE Uniserve

With the latest generation technology and significant investment, CSE Uniserve created the Modern Slip Energy Recovery (SER) Drive which offers extensive speed control and no synchronous speed dead band. Designed for the single or dual motor Semi-Autogenous Grinding (SAG) mill market, this new technology addresses all mechanical, electrical, environmental and cost concerns. Delivering

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SAG Mill Grinding Circuit Design 911metallurgist

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the

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Benchmarking: Bond Santa Rita SAGMILLING.COM

SAG mill: 30 foot diameter by 15.4 foot effective grinding length (EGL) which usually stands for "slip energy recovery", suggesting that the SAG mill uses a gear drive with an induction motor. Assume that the ball mill also has an induction motor with gear drive, so for both mills use 0.97 for mechanical efficiency between the motor output and the mill shell, and a motor efficiency of 0.96

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TMdrive -10SPR Product Application Guide

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 • Inherent fault tolerance a failure of the SPR

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liming to Design and Supply the World’s Largest SAG Mill

The 42ft diameter SAG mill is the world’s largest and the first of its kind. The Conga project is at its feasibility stage, and with the engineering and release for fabrication of these mills, Newmont seeks to maintain the option of proceeding with the Conga project with an accelerated schedule. Full funds approval is expected from the board of directors in the first half of 2011. The Conga

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Frozen charge detection and automatic loosening with

dually set mill angle between 30° and 45° (see icon 6 in figure 4) 30° are selected in Figure 5 where a strong counter-torque is applied. This counter-torque of up to 130% (almost 100% in figure 5) stops the mill shell imme-diately. The charge slips due to its high kinetic energy. For the case the charge does not slip at the first time,

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