Ring gear drives huge grinding mill , that are bolted to the mill shell and a stationary stator assemble that surrounds the rotor elements , this mill uses a ring-motor drive, Figure 5 The ....
By using us to reline and rubber line your mills, we will slice through your down time and get your mills up and running at 70 of the time , Complete Relining Solutions , Contact News More Concentrator-SAG-Mill-No2-Stator-Cover-Installationjpg ....
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Sep 23, 2014 0183 32 Most of our work since 2000 has been in developing grinding mill foundations to avoid vibration and unacceptable deflections On a recent project for a plant in Peru, the client was told by the mill vendor that there was no need to do a systems dynamic analysis on the mill foundations because the mills on that project were gear driven rather than being driven by ring motors gearless drives...
SAG Mill Components Previous Next , If the trunnion bearings are not reliable the complete mill is not reliable Various trunnion bearings designs are used, ranging from fully hydrodynamic to fully hydrostatic , This makes the mill essentially a part of a synchronous motor rotor with the stator in its usual position around the rotor ....
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EXPERIENCE WITH SYNCHRONOUS AND SLIP RING INDUCTION MOTORS DRIVING CEMENT MILLS , 2 Introduction 3 3 Ball mill and motor 3 31 Ball mill load characteristics 32 Motor torque defined 33 Differentiating characteristics 34 Synchronous motor , motor is no different than the stator windings of an induction motor However, because of its ....
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding An induction motor can therefore be made without electrical connections to the rotor...
In-house repairs In-house repairs have ranged from fractional horsepower motors at low voltage to over 6000 hp at up to 138kV The largest generator stator and rotor repairs undertaken include a 94 Mw Stator rewind for a Power generation company, and a complete stator and rotor rewind of 39,540 kVA, 138 kV, 3600 rpm Brush Turbo Generator...
of the complete SAG mill unit including foundation, mill bearing as well as the electric motor The analysis was also exchanged, reviewed and discussed with independent specialists Design Of Converter And Control System The basic circuit of the converter is a cyclo-converter in 12 pulse configura tion It has been selected considering low ....
the-art simulation tools allows Polysius to design and build complete , of motor stator and motor poles, which are attached to the mill shell Drive motors In the case of ring gear drives, either wound rotor induction motors or synchronous motors , motor on a SAG mill...
Abstract Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30 176 shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and two six-pulse cycloconverters This paper presents and evaluates three different modeling options for the SAG mill drive...
overheating during motor starting For brushless motors squirrel cage protection is derived from stator current inputs Protection characteristics are shown in the following graph and the thermal limit is defined by the Stall Time and Locked Rotor Amps relay setpoints For collector ring motors the squirrel cage...
Induction Motors Performance Study under Various Voltage Sags Using Simulation 35 voltage sag of voltage amplitude, are considered Fig3 shows a stator line current after the occurrence of...
Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly longtime outages, are of great benefit Paper presents the development of phase and qd space vector models of the 2-stator winding synchronous motor used in SAG mill driv...
Remote Power Station Recovery SAG Mill Motor Programmed Rewind How a mining company reduced costs by over 60 with independent advice Remote Power Station Recovery , A major systems disturbance resulted in 4 of the 8 operational units at the station failing with stator earth faults...
use of big mill grinding circuits, where large power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous SAG mills and re-cently, ball mills are also being considered This work addresses some current issues involving design and application of high-power drives employed in SAG grind-...
Mar 31, 2018 0183 32 The milling of the materials is a very useful procedure in various domains in life as well as in the constructive domain Click HERE to subscribe to Make i....
SAG Mill Motor Programmed Rewind During a visual inspection condition assessment on the SAG Mill it was identified there was an insulation anomaly in the rotor which exposed the business to the risk of unexpected failure...
On site we have a Sag Mill Driven by a 5500KW Motor We have a vibration issue right across the Mill , I know they have a complete new motor in stock but is it the motor or the exciter if this is an issue Could it be best to recommend to change out the exciter only , Loose stator coils in synchronous motors will generate fairly high ....
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-Sag Mill stator windings-Ball Mill stator windings Mechanical AC Winding Solutions provides Mechanical supervisors, fitters and Boilermakers for on field services, which are able to provide the expertise in the installation, dismantling and assembling of motors Emergency Service...
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With the support of our employees, we are supplying and manufacturing Three Phase Motor Stator for last 2 years The stator of an induction motor has a number of slots to wind a 3-phase circuit Three phase windings are arranged in such a manner, that they produce a rotating magnetic field after AC...
Drive and Automatic Control Management Furthermore, preventive and corrective maintenance services for ring motors and synchronous motors used in SAG Mills and Ball Mills are provided, as well for low voltage motors A comprehensive solution to all requirements in electric drives and automation plants is added to this high specialization servic...
On site we have a Sag Mill Driven by a 5500KW Motor We have a vibration issue right across the Mill The highest vibration is 30mm/sec RMS axial on the motor non drive end bearing White metal Bearing The gear mesh frequency is 4200 CPM The dominant frequency is 2400 CPM...
SaG mill at Minera los Pelambres, chile 4 SaG mill at Minera Peñasquito, Mexico the spirit of innovation has been integral for the development of gearless drives , flux by measuring the voltage and the stator motor current Furthermore, the Transvector Control pro-vides for the optimization of the motor torque and...
Rotor current measurement of motors Rotor current will be directly proportional to torque and stator current In affect you could measure the stator current and calculate the approx rotor current , Torque delivered would be around 16 x Full load torque, very typical for a ball mill or sag mill ,...
When it Comes to Mining, Bigger is Best Gearless mill drives may be the key to maintaining throughput Venkat Nadipuram One of the key challenges in the mining industry today is maintaining throughput in the face of ore grade quality that has declined by ,...
Gearless Mill Drives Machinery Risk Solutions Practice 2009 Matt Dugalic PEng, MARSH , Copper Zinc Electrical Flashovers of SAG Mill Stator /- 115 Iron / Salt Typhoon Emma /- 1077 Siemens , of the Ring motor the vibrations disappeared...
Experienced technicians guidance is available on the phone, and on the internet. One or more engineers will be dispatched to the quarry site to help install the customers’ plants. Necessary training about machine daily maintenance to local workers is provided also.
