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 ...

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 …

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 ring motor is not self-supported and requires the mill to mount the rotor poles and needs the mill foundation to support the stator. In addition, considerations for mill load-ing and environmental factors such as earthquakes would be required to accurately represent conditions at a typical mine site.

mill drives require a powerful control system. Excellent performance characteristics can be obtained by applying TRANSVEKTOR® control. The control principle shown above is based on aligning the stator current's phase angle with the angle of effective flux. To calculate flux conditions, the motor is simulated by two mutually supplementary models,

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 ...

Drive and Automatic Control Management (A&CA) was born in 2000 in order to provide assistance and technical services of high specialization on ring motor technologies with application on SAG mills and industrial processes automation. This business area considers two specialties: Automatic Control and Electrical Drive, providing the specialized technical …

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).

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 ...

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.

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 ...

Abstract: Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30° 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.

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 ...

• SAG mill well-advanced: SAG mill shell fully in place; gearless motor drive is in place; work has begun on the stator windings • Installation of the cyclone towers and 3 new leach tanks is largely complete • Electrical works are ramping up • New tailings facility is complete and ready for use Phase One advancing well, with plant ...

The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor for the 38 ft SAG mill had not failed. It too had an ABB motor and it had operated longer than the Collahuasi motor.

grinding (SAG) mill and a ball mill. The SAG mills are driven by two 3.550 kW motors sharing a single cooling system, which consists of a pair of ventilation fans, one for operation and one for standby, connected to a single duct, which then splits to feed the two motors through their bases.

Space Vector Modeling of a SAG Mill Drive and Evaluation during Mill Shutdowns | Castro, Pablo; Valenzuela, M. Anibal | download | BookSC. Download books for free. Find books

SAG Mill Components. ... If the trunnion bearings are not reliable the complete mill is not reliable. Various trunnion bearings designs are used, …

The client required an online monitoring system for its SAG mill. 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 …

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CSLGH900/6-214, 5.8 MW, 11 kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine By C. K. Amuzuvi & H. Warden University of Mines and Technology . 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 ...

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 …

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)

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.

Appli Parts motor start capacitor 161-193 Mfd (microfarads) uF 110-125VAC universal fit for electric motor applications 1-7/16 in Diameter 2-3/4 in Height CON-161-110. 4.6 out of 5 …

• 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well ... directly at the motor for both the stator and rotor ... A thorough analysis of the complete system (mill, pole units, bearings, foundations, interaction between rotor and stator, stator ...

- 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 2009 SAG mill winding repair and complete rewdge in Sossego Brazil for ABB

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The first step in actual rewinding is Coil Making; that is, creating new coils from new magnet wire and other materials. The primary objectives of Coil Making are recognizing the materials, tools and equipment needed; and how to make random wound coils to …

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.