drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Confi gured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need

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Electric Motors The standard inching drive motor is a NEMA or IEC frame typically foot mounted to a motor scoop or base plate. Typical motor speeds are either 4 or 6 pole, i.e. 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or …

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Ring Motors vary the speed of the mill by changing the sta-tor frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation. 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.

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SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

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the accuracy of the load sharing between the two motors. KEYWORDS SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed INTRODUCTION The project is located 15 km southwest of Princeton, British Columbia (BC), an established mining town. The initial exploration at Copper Mountain dates back to 1884. In 1923, Granby

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The CCV – ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill

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Power predictions are only valid below motor rated speed. Most mills (outside of Australia) use synchronous motors. These motor have the following characteristics (in general) The maximum power indicated on the name-plate is the power on the output shaft of the motor (or mill shell for gearless).

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dual motor sag mills. dual pinion sag mill x lss motor airclutch load sharing system induction motorsfor dual or single pinion configuration of ball and sag mills, the Read More.

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Since the early 1980s, we have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only. SAG and AG Mills operate by lifting ore/grinding media and dropping it on ...

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SAG mill motors have been upgraded to total 13.8 MW by adding cooling to drive transformers (6.9 MW per motor). SAG mill operating with 17% v/v ball charge and 27% to 28% v/v total filling; SAG mill operating typically 10.2 RPM. Ball mills operating 34% to 35% v/v total filling; Circuit P 80 =150 µm (was 180 µm before SAG motor upgrade)

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Jun 26,, Gearless mill drives (GMDs) have been installed on platinum-miner, GMDs are used on the larger ball and semi-autogenous grinding (SAG) mills,, the upper limit on a single pinion drive and 13 MW on a dual pinion drive.

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motor and mill structures). Increasing the motor speed, ω, holding the power, P, constant results in a reduced torque, T. Thus, a purchaser who specifies a higher rated speed of the mill will get a lower torque design, usually resulting in a lower motor cost. The paper specifically describes SAG mills, but the equations and principles apply ...

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Mill load sharing – Maintains equal torques on dual pinion mills throughout the whole speed range. Controlled rollback – Prevents backlash and reduces downtime. Mill power ride through – Keeps the mill operating even under …

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installed power to maximise net present value. The use of a dual SAG mill arrangement in a cost effective layout added substantial value to the project by increasing both initial and post Year 6 plant throughput for a modest increase in project capital cost when compared with the DFS case of a single 21.5 MW Gearless Motor Drive (GMD) SAG mill.

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SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into …

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Due to the great technical knowledge and safety protocols of Outotec in this type of work, Codelco Andina invited the company to participate in the change-out of two of its 7500 and 8500 HP SAG grinding ball mill motors in the interior of its underground operation.

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The subject of this paper is a synchronous drive of grinding ball mills 4 MW, 150 rpm, 6 kV, 50 Hz on the base of PWM CSI. The system is installed at the …

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1 x SAG Mill & Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38' x 26') (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) Variable Speed Drive Yes Max.

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Inventory ID: 6K-HM03. UNUSED FL 22' x 41'6" (6.7m x 12.7m) Dual Pinion Regrind Ball Mill, 11,000 kW (14,750 HP) ABB Motors with VFD 60hz.

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Inventory ID: 6C-HM03. UNUSED FL 36' x 24' (11m x 7.3m) Dual Pinion SAG Mill with 2 ABB 9,000 kW (12,069 HP) Motors for Total Power of 18,000 kW (24,138 HP)

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Dual grease purged fluoroelastomer seals were included for long life and, The steel mill had gearbox failure on a large BOF drive that became frozen due to rust,, confidence with a stronger, more reliable SAG mill replacement gear, Horsburgh & Scott identified an input worm gear pinion and worm gear that were out of.

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SAG mills grinding media includes some large and hard rocks, filled rate of 9% – 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills. How does a …

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Outotec has designed, manufactured and installed over 8,000 ball and pebble mills all over the world for a wide range of applications. Some of those applications are grate discharge, peripheral discharge, dry grinding, special length to diameter ratio, high temperature milling oprations and more. All equipment adheres to the applicable ...

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