The motor designer (or vendor) will convert the specified rated mill speed into the speed of the motor, ωrated as Hz, which for a Gearless Mill Drive is simply ϕRPM ÷ 60. For a …
Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing …
Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a 11.000 HP synchronous motor of variable speed. General Description of the Drive. The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two Three–Phased Cycloconverters.
SAGMILL NNDN RING 13uu PIN~ GEAR AIR CLUT SAGMILL I RINGMOTOR I I {I 1 1 Fig. 1 — Twin-pinion drive gear driven motor. Fig.2— Gearless mill with a ringmotor. of the grinding systems. NPCS were capital costs in Table 1 are based on variable speed ac drive complete determined on grinding systems that operations with three different produc- …
WEBOur GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself …
SAGMILL NNDN RING 13uu PIN~ GEAR AIR CLUT SAGMILL I RINGMOTOR I I {I 1 1 Fig. 1 — Twin-pinion drive gear driven motor. Fig.2— Gearless mill with a ringmotor. of the grinding systems. NPCS were capital costs in Table 1 are based on variable speed ac drive complete determined on grinding systems that operations with three different produc- …
Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous (SAG) mills and recently, ball mills are also being considered. This work addresses some current issues involving design ...
In the mineral processing industry the use of large gearless cycloconverter drive systems for SAG-Mills has become more and more common in the recent years. Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimization of the process. The design of such large mill drive systems …
Building on over 130 years of experience in the mining industry, ABB's Ring Motor factory located in Galindo provides the engineering and manufacturing of ring motors, the main component of ABB's Gearless Mill Drive (GMD) systems manufactured by ABB for the mining sector. The 20,000 m2 plant manufactured over 110 motors delivered in over 25 …
Gearless mill drives: better by design . GMDs eliminate the need for a ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, which are used in a conventional mill drive system to transmit the torque from the motor to the mill. Instead, the torque is transmitted through the magnetic field in the air gap between the stator and …
ABB is buying Alstom's ring motor business to enhance its gearless mill drive (GMD) activities. The business, based in Bilbao, Spain, has about 120 employees and achieved a turnover of €57m in 2012/13. It will become part of ABB's Process Automation division. ... Such motors are powerful enough to rotate a 12.8m SAG (semi …
SAG Motor (Spain) S.L., located in the Basque Country, on the the most industrialized areas of Spain, is a high tech manufacturer for permanent magnets synchronous (PMS) gearless traction machines present in more than 15 countries. Over the past decades, we have provided reliable and cost-effective products for customers from all over the world
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 …
1 | P a g e AUTOGENOUS AND SEMIAUTOGENOUS MILLS 2010 UPDATE Stuart M. Jones, Jr.1 and Moris Fresko2 1Metso Minerals Industries Inc. 2715 Pleasant Valley Road York, PA 17405-7043, USA (stuart.jones ...
The gearless motor (also called wrap- around motor or ring motor) is a very large synchronous motor. The poles of the motor are directly installed on a pole flange on the …
Gearless Mill Drive (GMD) systems are characterized by having the motor wrapped around the mill like a ring. For this reason, they are often referred to as ring motors. The rotor poles are attached directly to the mill (head) flange, and hence the rotor becomes an integral part of the mill, as shown in figure 4.
Whether you're talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That's why we always design our Gearless mill drives drives to combine maximum performance with limited space requirements. Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this notice-
Gearless is always variable-speed. Synchronous and induction are normally fixed-speed. Can be made variable speed by adding more equipment and sacing electrical …
Gearless Warp Around SAG Mill. Previous. Next. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives in the cement industry, driving tube mills with diameters of 2.5 to 4 meters with drive powers ranging from 3000 to about 5000kW. Why then did the mineral ore processing …
Mill drive selection for semiautogenous grinding mills. Webball mills, 18x27 drive with an air clutch. motor, $602,000 6050 D Primary SAG, 34x1 6 Two vafiable speed dc motors coupled mill, $4 million 22,500 to a gear drive with air clutches. motor, $1.28 million each 6000 Two secondary ac synchronized motors coupled to a gear mill, $2.5 million ball …
When mill power is between 18 and 20 MW, which is the current manufacturing limit of ring geared mills [2], either a gearless mill drive (GMD) or a ring geared mill with dual pinion motors can be chosen. Selecting between gearless or ring geared design is mostly dependent on size of the mill and power and speed requirements [3].
answered. Depending on the mill size and type, the mill can be driven by several configurations of drive systems. The main options are single low speed motors connected to a pinion driving a ring gear, two low speed motors connected to two pinions and driving a ring gear, or a gearless motor mounted directly onto the mill. In addition, a gearbox
Gearless or ring motor drives; Twin CCV or Cycloconverter; Twin ICI or Load Commutated Inverters using variable frequency; Quadramatic II LCI drive. For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a ring gear and single pinion arrangement.
Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to …
New Human Machine Interface - RMD Cockpit. With the RMD plus solution, operations and maintenance activities are fully optimized with the newly developed Human Machine Interface "RMDcockpit".. Based on ABB's 800xA platform, the RMDcockpit is a specific mill application tool comprised of a touch screen panel allowing full access to the main …
Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied ...
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.
SAG Motor, Leading the Elevation Gearless Traction Machines Industry through design, Technological Innovation and High Quality Production Company Profile SAG Motor (Spain) S.L., located in the Basque …
that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the project economics. After assessing the potential reliability difference between the 40 ft SAG mill and the equivalently powered 42 ft SAG mill, Newmont made the decision in 2010 to purchase a 42 ft SAG mill from and a 28 MW GMD from ABB ...
