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ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability .
ABB's scope of supply consists of three complete GMD systems including transformers, ring motors and E-house. One 26 megawatt GMD system will be installed for a 40-foot diameter SAG mill, while two 20.5 megawatt GMD systems will be installed to drive two 27-foot diameter ball mills.
Common types of grinding mills include Ball Mills and Rod Mills. This includes all rotating mills with heavy grinding media loads. This article focuses on ball and rod mills excluding SAG and AG mills. Although their concepts are very similar, they are not discussed here. Photographs of a glass ended laboratory ball mill show action of ball mass within the mill. The action of other grinding ...
Fig. 2. Power circuit of synchronous motor with two stator windings fed by a 12-pulse cycloconverter. TABLE I Parameters of a typical synchronous motor for a SAG Mill application Parameter Description Value P Power 12685kW v l−l Rated Voltage 1900V rms i a,b,c Rated Current 2x1986A rms i max Max. Current 2x2582A rms p Pole pairs 40 pairs of poles
sag mill wrap around motor Gearless mill drives Grinding ABB. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.
Mills and GMDs Maarten van de Vijfeijken* looks at large, larger and the largest units in grinding ore ... efficiency and the availability of the mill. The gearless motor is fed by a cyclo-converter which lets the operator easily vary the mill's ... the stator of a 40' SAG mill is over 21 m high OCTOBER 2010 International Mining 31 ...
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 drives.
View Scott Ruddle's profile on LinkedIn, the world's largest professional community. ... - Rewind 2 x 2.5MW, 11KV motors (ABB Perth) - Stator rewedging (ABB Perth) - 30MW, rotor modification and rewedge of stator (Woods Group, South Headland Australia) ... 2009 Complete rewind to 22MW SAG mill in ndida, Chile for ABB
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M. Ahrens, ABB, Switzerland ... 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 ... through the magnetic field in the air gap between the motor ...
Motors & Drives; Ring gear drives huge grinding mill. By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and ...
A stepper motor, also known as step motor or stepping motor, is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.
speed of the mill. Thus, the SAG mill motor has 72 poles and the ball mill motors have 56 poles. • Excitation transformer and excitation converter with full wave control. The excitation transformer is fed at 4.16 kV and its secondary is connected to the 6-pulse excitation converter. • The power section protection system, over-voltage
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. Two or more electrical contacts called "brushes" made of a soft conductive material ...
Grinding & Classification Circuits robertd 2018-06-17T09:51:34-04:00. ... Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. ... 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 ...
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
Jan 19, 2016· The mills at Sentinel in Zambia are amongst the world's biggest, with 2 off 40 ft SAG mills complete with 28 MW drives, and 2 off 28 foot-ball mills .
Find many great new & used options and get the best deals for 73500AD - Re4r01a Complete Pump With Mill Flat Rotor Stator Bushing .940" ID at the best online prices at .
Figure 1: Ring Motor of the 38' SAG-Mill of Rio Paracatú Mineraçao; Brazil 3 Design Verification To assure reliability of operation the mechanical design must be verified. The magnetic field and the motor torque deform the stator of the motor. The stator ovalization leads to additional air gap deformation, which must be kept between limit ...
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. An induction motor's rotor can be either wound type or squirrel-cage type.
TECO-Westinghouse synchronous motor are also available with brush rigging and collector rings. The complete assembly is designed for long life and is easily accessible for inspection and routine maintenance. Made of steel or other suitable materials, the collector rings are shrunk onto a steel mandrel over a Micarta insulation sleeve.
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 ...
SAG Mill Rewedge Work in record time Climax Molybdenum USA Terry Reader, Electr. ... motor stator wedges ... Performed re-wedging on ~25% of the motor rather than a complete re-wedge - Eliminated risks associated with the wedging process –i.e. insulation damage, bars lifting, more ...
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.
M&C's scope of work comprised the installation of stator quadrant windings on the four mill motors, which were manufactured by Siemens in Germany. The four motors are gearless mill drives (GMDs), also known as wrap-around motors, and include two 26MW ball mill motors and two 28MW SAG mill motors.
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