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. The necessary ...
Цааш унших
SAG Motor (Spain) S.L., located in the Basque Country, one of the most industrialized areas in Spain, is a high technology 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 …
Цааш унших
use of big mill grinding circu its, where large power gearless. motor drives w ith cycloconve rters in the range around 20 MW. are being applied for semiautogenous (SAG) mills and re-. cently ...
Цааш унших
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 can be used to reduce the speed of a high speed motor. This gearbox is then placed between the high speed motor(s) and pinion(s) and the
Цааш унших
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. The …
Цааш унших
The current paper looks at evaluating the merits of large geared mills versus gearless driven mills by evaluating the following factors: The capability of currently available systems in terms of power and mill diameter Efficiency in terms of overall electrical power consumed vs mechanical output power Capital cost Running costs Cooling requirements in terms …
Цааш унших
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
Цааш унших
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 …
Цааш унших
Mining Motors & Drives Solutions. Ring-geared Mill Drives. Variable Speed Drives for HPGRs. Document kind. ... Gearless mills, ring-geared mills and high pressure grinding rolls. Leaflet. Leaflet. . PDF. file_download. ... The world's first 42-foot diameter 28 MW gearless SAG mill. ID: ...
Цааш унших
ring motor FE-Model with the 19.3MW Gearless Mill Drive at the Peñasquito site in Mexi-co. Up to forty acceleration sensors have been placed inside the motor to measure the impact of two exciters attached at the top and the bottom of the motor housing. These tests provided a detailed frequency response and structural
Цааш унших
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
Цааш унших
Advantages of SER drives for SAG mills. Friday, December 19, 2014. For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cyclo-converter) is typically used because gearboxes and pinion gears reach their present limit …
Цааш унших
the mill itself becomes the rotor of the gearless motor.Gearless ring motor for sag mill principles . Apr 08 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.Gearless mill drive system (GMD) Go ...
Цааш унших
the poles' excitation via the slip rings to the rotor of the gearless motor. Knife switches are installed directly at the motor for both the stator and rotor circuit to make a visible disconnection before entering the motor for maintenance purposes. — ABB's gearless mill drive (GMD) ABB AbilityTM MineOptimize ABB AbilityTM MineOptimize is a 4 ...
Цааш унших
mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. 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 taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft ...
Цааш унших
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-
Цааш унших
To shield the motor winding system from the severe and hostile plant environment, a combination of dual sealing rings at the interface to the mill body, with a …
Цааш унших
In [1], Svalbonas reviews the states-of-the-art in the design of grinding mills and ring-motors (for gearless drives). He concludes that failures in ring motors …
Цааш унших
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.
Цааш унших
With our SAG mill running at 65.4% critical speed (mill @ 8.7 RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately 1.2 MW of slip energy; the power ...
Цааш унших
mine. Ball and SAG mills are one of the most expensive pieces of equipment designed without redundancy, thus they can quickly become the bottle neck of the whole process, as the productivity of the plant is dependant on the availability of the mills and their motors. The new Gearless drive controller was developed with the aim to
Цааш унших
With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, …
Цааш унших
mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. 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 taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft ...
Цааш унших
s.Slip-ring motors are. induction motors witha wound rotor solution. They are available up to powers of 8 MW and represent a good choice for installations in remote ar. as or with high starting torque require. ents. A liquid rheostat is used for starting.ABB's motors represent a robust, safe and energy efficient solution for energy-intensive p.
Цааш унших
Conga: The world's first 42-foot diameter 28 MW gearless SAG mill. ID: ... Maarten van de Vijfeijken 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 mill shell: this means the mill body becomes the rotor. ...
Цааш унших
The gearless concept. The gearless drive avoids any contact between the rotating mill and the static parts of the motor. This allows for contin-uous workflow without maintenance …
Цааш унших
Gearless Warp Around SAG Mill. 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.
Цааш унших
gearless sag mill slip ring motor - osteopathe-colomiers.fr. Frozen charge detection and automatic loosening with, mill angle for a Frozen Charge trip at a large SAG mill for reference The speed is following the preset speed ramp until the trip shuts of the motor and lets the mill oscillate The torque value is constantly growing and the mill angle indicates …
Цааш унших
use of big mill grinding circuits, where large power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous (SAG) mills and re-
Цааш унших
or impossible to start large motors, particularly those which must start under load. Mill drive example An example of slip power recovery is the wound rotor motor shown below, one of two for powering a new 10,000 kW SAG mill in Australia as shown in Figure 3. This installation includes: • Two 5000kW six-pole WRIMs with 11,000v stators
Цааш унших
