synchronous ring motor (wrap-around motor) is installed concentrically around the mill. The mill shell carries the rotor poles which are individually mounted to form an even air gap with the wrap around motor. The number of poles (up to 76 poles on larger SAG mills) as well as the way the poles are mounted depends on the size of the motor.Web
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SAG mill models. Austin SAG model (hybrid phenomenological and empirical model) ... Note that modern wrap-around (gearless) mill drives do a software correction to report mill motor output power (which is the same as shell power). Therefore, new gearless mill drives do not require any correction when comparing DCS power measurements to model ...Web
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along the longer mills incr ease s, as found out in the application to the first 40 foot SAG mill at Cadia (Hart e t al., 2001 ). The obvious alternat ive is to prevent the larger rocks from ever ...Web
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The largest and heaviest component in the ABB solution is the huge GMD stator, which wraps around the SAG mill. Normally, ABB designs the GMD stator to be transported in …Web
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pool term for ag/sag mills operating in this manner as well as allowance for mills with wrap-around motors. Applying this model to predict the power of ball mills gives the results shown in Figure 2. From an accuracy viewpoint it can be seen that the predicted values are highly correlated with the observed values. TheWeb
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This is because the product size distribution from AG/SAG mills tends to have more fine material than the HPGR circuit product (Morrell, 2009; 2011) and hence need less ball mill power. Based on ...Web
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Direct drive systems utilising low speed synchronous motor(s) High speed drives through gear reducers; Single or dual pinion drives (with load sharing technologies) Wrap …Web
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Wrap-around Motors Cycloconverters & Excitations Transformers, E-House Containers incl.: Cycloconverters, MCC's, PLC's, VMS ... 75/100/125 MVA Escondida IV, Chile Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 4583 t/h Ball Mills 4583 t/h Consultant: Bechtel, Chile Mill Builder: FFE Minerals, USA Mill Size: SAG Mill ...Web
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pool term for ag/sag mills operating in this manner as well as allowance for mills with wrap-around motors. Applying this model to predict the power of ball mills gives the resultsWeb
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The GMD system The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, …Web
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· Ball and SAG Mill installation and maintenance. · Wrap-Around Mill maintenance. · Fitting and reversing of girth gears up to 40ft diameter. · Installation of sole plates using flatness lasers and digital levels. · Swing jaw crusher installation, overhaul and maintenance. · Cone crusher installation, overhaul and maintenance.Web
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Many large mills around the world (Esperanza with a 12.8 m mill, Cadia and Collahuasi with 12.2-m mills, and Antimina, Escondida Ph IV, PT Freeport Indonesia, and others with 11.6-m mills) have installed SAG mills of 20 MW. Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having …Web
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Wrap-around Motor Gear Box Clutch Gear Box & Clutch Gearless Ball Mill Motor Type Motor Type BM Specific Energy, kWh/ton Mill Motor Type Selection Code Eff. Loss A B C SG Ore ... The SAG mill pinion energy is determined from the SAGDesign™ testwork results as follows : W SDT = revs (16,000 + m s)) / (447.3 m s) where : W SDTWeb
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SAG mills were introduced to the industry in the late 1960's and have grown from 6,000 hp, or so, to leviathans drawing 30,000 hp from motors that wrap around the enormous mill shells or support trunnions. Also, over the years, daily mining rates and plant throughputs have soared. In the 1960's, the Silver Bell concentrator featured some ten ...Web
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SAG Mills. Add to quote. SKU: L01508 Category : Grinding Mills. Description Description. Manufacture and Design ... 40′ (12,192 mm) diameter 25′ (7620 mm) length Designed for 26,000 KW wrap-around motor * Note: motor NOT included. Related products. ID: C1109. 9′ X 10′ ALLIS CHALMERS BALL MILL, 400 HP; ID: C1226. 20″ X 18″ VIBRATORY ...Web
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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 toWeb
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by gearless drives (wrap-around motors). However, this approach neglects the dynamics of the foundations. Furthermore, the "system ... During this work, the characteristics of the SAG mill system were measured. The resonant frequency of the foundation was determined using an amplitude decay technique. Vibrations in the SAG mill statorWeb
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The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. ... in IM International Mining, October 2010 Issue Author: Maarten van de Vijfeijken The gearless motor (also called wrap-around motor or ring motor) is a ...Web
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unused fl 36′ x 17′ (11m x 5.2m) sag mill with 13,500 kw (18,355 hp) abb wrap around drive Inventory ID: 6C-GM01 UNUSED FL (Fuller-Traylor) 36′ x 17′ (11m x 5.2m) SAG Mill with ...Web
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The method of powering mills such as AG, SAG and Ball has a long and technically interesting history. It can be said; almost every decade in the last half century had its own trend. ... This is also the reason why the ringmotor is also known as wrap-around motor. DRIVE TECHNOLOGIES In the not too distant past, variable speed solutions were ...Web
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wrap-around motors) are quite different to gear-and-pinion drives. They do not have gears or pinions and hence the term "power at pinion" is not relevant to them. With these drives the literature normally refers ... AG/SAG mills in the data base are up to 40ft in diameter and ball mills are up to 26ft in diameter. The measured gross power drawsWeb
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23,808 ton/day Circuit is SAG mill limited Mill Motor Type Selection Factors Speed Motor Type Transmission Discharge C Factor : ... 60 0.1340 Wound Motor Gearless 61 0.1370 Wrap-around Motor 62 0.1400 63 0.1430 Code Eff. Loss 64 0.1460 122 1.30 65 0.1490 113 1.10 ...Web
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SAG mill trommel Mill braking system Hydraulic jacking system Portable hydraulic power unit. Motor and Drive 26,000 HP (19.4 MW) Siemens wrap-around drive motor 60 Hz synchronous Gearless, wrap around …Web
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Today, 40 ft. diameter SAG mills and 30 ft. diameter ball mills, both with motor powers of more than 22 MW, are commonplace as mine operators look for even larger equipment to achieve greater economy of scale. Mills with these larger drive capacities are driven exclusively by a "wrap around" ring motor (gearless mill drive).Web
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sag mill wrap around motor. mill with 1,500 HP Westinghouse synchronous motor through Fawick model 42VC1200,. gearless wrap around motor drive, 50 … More; The Large Wrap Around Motor Foe Ball Mill - … Ball mill - Wikipedia. A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing Ball mills rotate ...Web
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The gearless motor (also called wrap- around motor or ring motor) is a very large synchronous motor. The poles of the motor are directly installed on a pole flange on the mill shell: this means the mill body becomes the rotor. The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive ...Web
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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 …Web
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"wrap-around motor" or "ringmotor". The motor rotor is composed of individual poles mounted on the mill flange. The number of poles is based on the required speed of the …Web
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The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent …Web
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Gearless Warp Around SAG Mill For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives in …Web
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40′ X 25′ FL GEARLESS SAG MILL, 26,000 KW. new. Manufacturer: FL Description Manufacture and Design 40′ (12,192 mm) diameter 25′ (7620 mm) length Designed for 26,000 KW wrap-around motor * Note: motor NOT includedWeb
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The stator of the gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive (GMD) eliminates all critical mechanical components …Web
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The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.Web
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GMDs of 38 feet (~11.6 m) diameter SAG mill drives; in a remote location, recording simultaneously data of relevant electrical and mechanical parameters with focus on the wraparound gearless mill motor (synchronous machines), its VFC (Cyclo-Converter), isolation transformers and theirWeb
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The SAG mill and ball mill original design was reviewed and a change resulted in the application of a gearless drive wrap-around motors on both machines. This immediately delivered energy savings as the units areinherently more efficient in transferring incoming power to the shell of the mill. The use ofWeb
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