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The demanding applications for TECOWestinghouse DC propulsion motors and generators include ice breakers, submarines, tugboats, mine sweepers, seagoing dredges, and oceanographic vessels. Three classes of marine propulsion motors are offered. Our class one motors have unique, heavyduty features and provide special superquiet operation.
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M. rens, 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 ...
TECOWestinghouse 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.
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 cycloconverter 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 ...
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 gravelsized bits for smelting and ...
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 ...
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 football mills .
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 kV and its secondary is connected to the 6pulse excitation converter. • The power section protection system, overvoltage
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.
Grinding Classification Circuits robertd T09:51:3404:00. ... 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 ...
Each SAG primary mill (BolidenAllis) operates with two HP. Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a HP synchronous motor of variable speed. General Description of the Drive The SAG Mill Drive is mainly formed by a 11,000 HP.
MC''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 wraparound motors, and include two 26MW ball mill motors and two 28MW SAG mill motors.
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 squirrelcage type.
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 ...
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 openloop controller), as long as the motor is carefully sized to the application in respect to torque and speed.
Description: 13 ft diameter Allis Chalmers grinding mill configurable as ball or SAG mill – Shell cut into multiple sections for transport, can be fit to desired length – Falk Gear single helical 257 teeth with 38″ face width very little use in excellent condition – Pinion: 21 tooth good condition with bearings – High speed coupling – New gear spray lubrication system, Farval type ...
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 ...
Oct 02, 2014· Cadia GMD Stator: Observed Behaviour and Modelling admin 2 October 2014 Cadia. The Stator Behaviour. The Cadia SAG mill diameter is 40 ft and the ring motor that drives the mill is rated at 20 MW. In 1998 when the mill and motor were commissioned both were the largest machines of their type in the world.
Abstract: Typical drive configurations of highcapacity SAG mills use a twostatorwinding vectorcontrolled synchronous motor, with a 30° shift between the two windings, fed by a twosecondary deltadeltawye power transformer and two sixpulse cycloconverters. This paper presents and evaluates three different modeling options for the SAG mill drive.
Figure 1: Ring Motor of the 38'' SAGMill 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 ...
ABB''s scope of supply consists of three complete GMD systems including transformers, ring motors and Ehouse. One 26 megawatt GMD system will be installed for a 40foot diameter SAG mill, while two megawatt GMD systems will be installed to drive two 27foot diameter ball mills.
SAG Mill Rewedge Work in record time Climax Molybdenum USA Terry Reader, Electr. ... motor stator wedges ... Performed rewedging on ~25% of the motor rather than a complete rewedge Eliminated risks associated with the wedging process – insulation damage, bars lifting, more ...
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, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.
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 2stator winding synchronous motor used in SAG mill drives.
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