ring motor sag mill

Grinding Mill Gear Assembly - Mineral Processing & Metallurgy

Grinding Mill Gear Assembly. We will begin with the mill's bull gear assembly and work towards the motor, The BULL GEAR, sometimes called the RING GEAR is designed to turn the mill transforming the energy of the motor into motion for the mill. By mill we refer to Ball Mills, Rod Mills and SAG Mills.

Insurability of Large Gearless Mill Drives (GMDs)

Introduction. We have written on risk associated with large ring motors in gearless mill drives previously [1, 2, 3]. In [1], we observed that ABB and Polysius were far too confident in 2001 when they claimed that 42 and 44 ft diameter mills and ring motors posed only manageable risks and that a 44 ft mill and GMD design was ready and waiting for a purchaser …

REMOTE DIAGNOSTIC SERVICES FOR GEARLESS MILL DRIVES

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 purpose is to

Mining - Grinding and Processing | WEG

Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.

Electrolytic starter (LRS) for high power slipring motors ...

Why using a starter for slip ring motors. In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting torque. Higher is the inertia, higher has to be the accelerating torque, otherwise the start will be very long and the motor can be damaged by the heating. If the motor is started directly ...

Gearless mill drives - ABB

The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.

Our History as Comminution Consultants - DJB Consultants

1983: Conceptual study and pilot plant test work for the first 36 ft dia. SAG Mill with a GMD (Gearless mill drive, or ring motor) at 15,000 hp and commissioned in 1991. 1986: Development and successful implementation of a Bond Work Index-based methodology for estimating power requirements for SAG milling and secondary Ball milling.

Slip Ring Motors - matrix-industries

The motor's slip rings & brush gears, critical components on any wound rotor machine are rated for continuous operation and are fitted with highly reliable brush - lifting & short-circuiting devices.The unit's high quality carbon brushes feature a large cross- sectional area to better conduct high currents safely during heavy peak load ...

Ring-geared mill drives - Grinding | ABB

Ring-geared mill drive system High performance and flexibility in grinding Decreasing global mineral resources, exploitation of lower ore grades in more remote locations and extreme environmental conditions lead to increased material processing and potential rise in CAPEX.

Siemens expands mining portfolio to include gearless drive ...

The principal component of the new drive system, which was designed and constructed within just two years, is a ring motor with a width of 25 meters and a height of 20 meters. 38-foot SAG mill with gearless drive system from Siemens.

Ring gear drives huge grinding mill | Machine Design

The largest ringmotor- driven mill in the world is a 36-ft diam., 16,000-hp SAG mill that processes up to 2,000 tons of ore per hour. Located at Kennecott Utah Copper near Salt Lake, this mill uses...

AYCA | Services SAG mill Ring Motors - A&CA

Highly specialized services, solutions and technical assistance ensuring. the operation's availability and reliability. SAG mill Ring Motors. Ball mill Ring Motors. Frequency Converters. High current rectifiers for EW tank houses. Medium and high power synchronous motors. Low and medium voltage electrical systems.

Mill Lubrication System - SlideShare

Lubricant Data: Masbate Gold Project's SAG mill uses Compounded Gear Oil as their main lubricant. But a different class of Gear oil is use in every operating system of the SAG mill. SAG Mill Components Type Characteristic Motor Bearings Omala 150 Gear oil. 150 viscosity at 40 C and 15 viscosity at 100˚C Gearbox Omala 320 Gear oil. 320 ...

Design and dynamic behavior of large Ring Motors for ...

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.

What's the Difference Between SAG Mill and Ball Mill ...

The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...

Three Phase Slip Ring Rotor Starter Control & Power

Three Phase Slip Ring Rotor Starter Power Diagram. Power Diagram: Three Phase Slip Ring Rotor Starter Control Diagram. Control Diagram:Check more diagrams here: Three Phase Motor & Control Installation wiring diagrams. Electrical Technology. 7 Less than a …

SAG Mill Grinding Circuit Design - 911metallurgist

SAG Mill Design and Specification . ... The original SAG mill control loop, a mill motor power draw set point of 5200 Amperes controlling the coarse …

SAG Mill | Autogenous and Semi-Autogenous Mills | FL

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

Cone Crushers HP Series Cone Crushers

22 - Hydraulic adjustment motor 23 - Clamping cylinders 24 - Torch ring 25 - Cone feed plate 10 - Countershaft bushings 11 - Gear and pinion 12 - Main shaft 13 - Eccentric thrust bearing 14 - Counterweight guard 15 - Tramp Release assembly 16 - Eccentric bushing 17 - Eccentric 1 - Locking bolt 2 - Feed bowl hopper 3 - Bowl 4 - Adjustment ring 5 ...

Mill (grinding) - Wikipedia

SAG mill. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

Ball Mills Brochure - Corporation - PDF ...

Ball mills designed for long life and minimum maintenance overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 30' x 41' . and as much as 30,000 HP. Larger ball mills are available with dual pinion or ring motor drives. Our mills incorporate many of the qualities which have made the Marcy name famous since 1913.

Teco-Westinghouse Custom Synchronous Motors

Synchronous machines can be found wherever there is a demand for highly efficient, cost-effective, dependable machines. They are frequently used for rolling, ball and sag mills, chippers, mixers, pulp refiners, pumps, fans, and compressor (reprocating and centrifical) drives.

abb low speed drive solutions for ring geared mills

Sag Mill Synchronous Motors. Geared VS Gearless Drive Solutions for Grinding Mills, Ore Crushers / sag mill synchronous motors 38' x 24, motor and large gear which driven by low speed. ... abb ball mill motor construction. ABB Ring-Geared Mill Drives Power & Transmission, ABB wins contract for world's largest low speed dual, Application ...

Ok Tedi plans for long term with SAG mill upgrades by ...

For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.

Ball Mills - an overview | ScienceDirect Topics

8.3.2.2 Ball mills. The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 1–1.5 times the shell diameter ( Figure 8.11). The feed can be dry, with less than 3% moisture to minimize ball …

Wound Rotor - TECO-Westinghouse Motor Company, a …

Ball and Sag Mills Cranes Hoists Pumps Fans and Blowers Chippers Conveyors Banbury Mixers With high efficiency ratings that save money over the entire life of the motor, these machines can be designed for voltage requirements ranging from 220 V to 13,800 V and for speeds from 300 RPM to 3600 RPM depending on

gearless mill drives Archives - International Mining

ABB was awarded a multi-million contract to provide a 28 MW GMD for a 40 ft (12.2 m) SAG mill and two 22 MW drives for a pair of 28 ft (8.5 m) ball mills at Aktogay, and three identical systems at Bozshakol. Each includes phase and excitation transformers, a ring motor with a local mill control panel, and a containerised electrical house (E ...

Industrial Solutions Autogenous,

SAG mill with COMBIFLEX® drive for gold ore grinding. Ball mill with ring motor drive. Brake of a ring motor drive. 8 Flotation Wet grinding Grinding is one of the most energy-inten- sive production stages and therefore has a substantial energy-saving potential.

Gearless Mill Drives | Beneficiation | Siemens Global

The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)

Construction of a SAG mill with the stator and the rotor ...

Fig. 1 shows the construction of a SAG mill [2]. It consists of a rotating hollow cylinder of about 12 m in diameter. Two sets of bearings in ring-shaped structures support the cylinder to let it ...

Mining industry | Market-specific Solutions | Siemens Global

Mining-specific solutions From electrical to digital solutions As one of the major suppliers of the global mining industry, we offer a comprehensive solutions portfolio that enables you to effectively meet your challenges at each process stage, from extraction to transportation and beneficiation.