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The GMD powers a 36' SAG (semiautogenous) mill at Carmen de Andacollo copper mine in central Chile. Carmen de Andacollo is an open-pit truck-and-shovel operation at an elevation of 1000 m. 90 % of the interests of the mine are held by Teck, Canada's largest diversified mining, mineral processing and metallurgical company, headquartered in ...
motor performance, Rewinding and motor replacement issues, Energy saving opportunities with energy efficient motors. 2.1 Introduction Motors convert electrical energy into mechanical energy by the interaction between the mag-netic fields set up in the stator and rotor windings. Industrial electric motors can be broadly clas-
"A complete diagnostic review was undertaken and revealed damage to the motor stator coil," BHP said. "The repair and remediation plan is being developed and the company can confirm the mill will ...
SAG Mill Components. ... If the trunnion bearings are not reliable the complete mill is not reliable. Various trunnion bearings designs are used, …
The Ringmotor stator is supported on the floor or on concrete pedestal and the rotor poles are mounted on the mill flange (the rotor is the mill itself). To prevent the rotor from touching the stator, the air gap level is supervised on the stator with …
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State-of-the-art SAG mills are driv en by ring motors with the stator poles mounted on the circumference of the mill cylinder. The stator and the rotor …
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. ... it may well be that one of the motors has insulation problems on windings in either rotor or stator ...
Stator Analysis Lumwana - Zambia (Equinox): 38 ft SAG and 26 ft Ball Mill SomeofOurProjects: Cadia - Australia(Newcrest): 40 ft SAG and 22ft Ball Mills El Teniente - Chile (Codelco): 38 ft SAG and 24 ft Ball Mills Sossego - Brazil (CVRD): 38 ft SAG and 24 ft Ball Mills Telfer - Australia (Newcrest): 36 ft SAG and 24 ft Ball Mills
Unlike more traditional ring-geared mill drives – where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors – GMDs work by mounting rotor poles directly to the mill body and surrounding it with the stator ring, meaning the mill itself is incorporated into the motor.
Mill drive example An example of slip power recovery is the wound rotor motor shown below, one of 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)
Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. 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 ...
• Integrated and split stator hoist motor options • Mine fan ventilation solutions (MV and LV) Mineral Processing – Grinding Mills GE provides flexible and innovative mill solutions across all types of grinding, from single and dual pinion AG, SAG and ball to hPGr. This helps you to meet high-capacity demands with less equipment.
kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine C. K. Amuzuvi α & H. Warden σ. Abstract- This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited, Damang Mine. It provides
Fig. 3. Waveform of voltages and currents in the stator at steady state (simulation). Fig. 5(a) shows the conduction state of a three-phase six- pulse CCV feeding the three-phase stator windings of a syn- typical gearless synchronous motor that is used in SAG mills.
Ball mills and SAG mills, ... To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor terminals. ... complete control of ...
The stator windings in the SAG mill motor have a history of becoming loose. If untreated, loose stator windings will lead to electrical faults with the motor and if complete dislodgement occurs, damage to the stator and rotor. Any downtime in the equipment for …
The development of numerical methods to model grinding mill systems is presented. These methods can be used during design of grinding facilities in mineral processing and other plants to reduce the risk of adverse behaviour. The results obtained
Siemens, the company that introduced Gearless Mill Drives (GMD) to mining industry started up its first GMD on a ball mill in Norway in 1980. The mill and its drive system are still in service. Today, GMDs are mainly used for SAG mills between 36 and 40 feet (10.7 to 12.2 m) and ball mills from 24 to 28 feet (7.3 to 8.5 m).
for a 20 MW SAG mill considering a power supply price ... complete the supply. Variable speed for process optimization The speed of the GMD can be adapted to the operational ... motor (equally distributed around the circumference of the motor – in all 4 stator segments)
Traditional ring-geared mill drives have a ring-shaped gear that encircles the mill and drives it through one or two pinions followed by conventional motors. GMDs mount rotor poles directly to the mill body and surround it with the stator ring, incorporating the mill itself into the motor.
2 Induction Motors Induction motors derive their name from the way the rotor magnetic field is created. The rotating stator magnetic field induces currents in the short circuited rotor. These currents produce the rotor magnetic field, which interacts with the stator magnetic field, and produces torque, which is the useful mechanical
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.
Antamina Stator 38 ft Ring Motor failure analysis (Antamina); PT Freeport Indonesia GMD ... SAG mill gearless drive stator that vibrated excessively during commissioning. Root cause ... Complete redesign of head, bend and tail pulleys based on measured data and finite element analysis of the pulleys.
ABB's scope of supply includes two GMD systems for 38 foot 23 mw SAG mills (Fig.) comprising transformers, ring motors and complete containerized electrical houses (e-houses). The variable speed drive solution allows for optimization of the grinding processes for ores with varying properties and different mill loads.
Ball and Sag Mills Cranes Hoists Pumps Fans and Blowers Chippers Conveyors ... The unit's stator core features insulated low-loss, high-grade electrical steel. The slot is precisely punched and ... balancing of the complete motor. Users can select either split sleeve or anti-friction bearings. USA CANADA P.O.Box 277 (78680-0277) 18060-109 ...
Shell supported ball mills are ideal for the use of ring motor drives: 3 Because of the high rigidity of the mill shell, troublefree transmission of the magnetic forces is assured. 3 Due to the individual self-adjustment of the sliding shoes, the pole pads attached to the mill shell can be centered in the stator of the ring motor.
SAG Mill, Ball Mill, Overland Conveyor, Antapaccay 15. ... Externally installed converter and excitation transformers complete the supply. Variable speed for process optimization ... circumference of the motor - in all 4 stator segments)
The starting motor itself may not be able to accelerate to its rated full speed due to low bus voltage. Remember that starting torque of induction motor varies as square of the applied voltage. The voltage sag created by induction motor starting may cause lights to dim, contactors to drop out, variable frequency drives to shut down etc.
On 28 January 2015 the Svedala mill, part of BHP Billiton's Olympic Dam surface processing operations in South Australia, suffered an electrical failure and was safely placed in the maintenance position. A complete diagnostic review was undertaken and revealed damage to the motor stator coil. The repair and remediation plan is being developed ...