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)
اقرأ أكثرZurich, Switzerland, July 30, 2013. ABB, the leading power and automation technology group, announced today the acquisition of Alstom's ring motor business to enhance its gearless mill drive ...
اقرأ أكثرRing 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.
اقرأ أكثرThe 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 ...
اقرأ أكثرDesigned 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.
اقرأ أكثر(SAG) mill, ball mill, and crusher. A ball mill is a slightly inclined, horizon-tal rotating cylinder, partially filled with ceramic balls, flint pebbles or stainless ... the ring motor. This allows for continu-ous analysis of the system status and the ability to inform the customer in a
اقرأ أكثرGrinding 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.
اقرأ أكثرSAG 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.
اقرأ أكثرBall 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.
اقرأ أكثر8.3.2.2 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 …
اقرأ أكثرSynchronous 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.
اقرأ أكثرHighly 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.
اقرأ أكثرFig. 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 ...
اقرأ أكثرSAG Mill Design and Specification . ... The original SAG mill control loop, a mill motor power draw set point of 5200 Amperes controlling the coarse …
اقرأ أكثرThe 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- ... SAG-Mill GMD delivered by Siemens. The aim of the test program was to identify all real natural frequencies in a modal analysis.
اقرأ أكثرSAG Mill and Ball Mill Case Study. In September 2011, the company Outotec, located in Espoo (Finland), awarded Ingeteam a contract for the design and supply of the main drive equipment for a 2.3MW SAG mill and a 2.1MW ball mill to be installed in Russia. Outotec is a global leading company that designs and delivers turnkey projects in the ...
اقرأ أكثرThe 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.
اقرأ أكثرRing-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.
اقرأ أكثرSag 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 ...
اقرأ أكثرLubricant 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 ...
اقرأ أكثر22 - 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 ...
اقرأ أكثرSingle 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.
اقرأ أكثرSAG 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. The main demands made on grinding
اقرأ أكثرThe 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.
اقرأ أكثرABB 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 ...
اقرأ أكثر1983: 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.
اقرأ أكثرautogenous 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
اقرأ أكثرInstall the retainer ring and splash ring as shown. Mill TRUNNION LINERS. ... It is advisable to interlock the oil pump motor with the mill motor in such a way that the mill cannot be started until after the oil pump is operating. We recommend the use of a non-adjuslable valve at each bearing to prevent tampering.
اقرأ أكثرWhy 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 ...
اقرأ أكثرIntroduction. 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 …
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