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Copper Zinc Electrical Flashovers of SAG Mill Stator +/ 115 Iron / Salt Typhoon (Emma) +/ . . Siemens. ... condition of the motor. Reaching the operation temperature of the Ring motor .
For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slipring motors, eliminating all brush or slipring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.
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.
SAG mill, 40 ft, 42 ft, gearless mill drive, GMD, SAG manufacture, reliability .. The gearless motor (also called wraparound motor or ring motor) is a very large . this modifiion from axial to radial cooling, the cooling principle of the GMD. Get Price; Starting a 6kV 3Ph 2,200 kW 1,000 rpm slipring motor for a . Feb 19, 2017 Starting a ...
The Siemens 42ft 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)
Ringmotor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor driven mill in the world is a 36ft diam., 16,000hp SAG mill that ...
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, 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or 970 rpm for 50 Hz applications. The advantage of using a four pole motor allows for a smaller footprint and a smaller brake if
ringgeared mills. In fact the rotor of the ring motor is the mill itself and the stator is built around the mill shell. This is also the reason why the ring motor is also known as wraparound motor. 9 12 6 18 36 ... Presently SAG mills are mainly driven with variable speed drives, allowing the operator to react easily to the changes in ore
The c ombined motor and mill inertia is ... Ball mills and SAG mills, ... the slipring Induction motors are often preferred to synchronous motors due to their inherent ability to ...
Dec 19, 2014· Advantages of SER drives for SAG mills. Friday, December 19, 2014 ... So for a fixed torque and higher speed, the power obtained from the motor is higher than the motor nameplate rating. Brush/slip ring maintenance is one issue. However, when the brushes are specified correctly for the load, the wear is manageable. ...
autogenous grinding (SAG) mills in the framework of an order for two 32foot SAG mills with a performance of 11,200 kW. This project for the Chuquicamata mine in Chile represented a monumental achievement, as the difference between creating a drive for a 21foot diameter ring motor and a 32foot ring motor .
Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing to produce the world''s largest SAG mill of 42'' in diameter drawing power at 28 MW. Today, is the world leading supplier of gearless SAG mills operating globally.
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
Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup, operation, and optimization of your mill.
Sep 23, 2014· This means that SAG mill foundations behave very differently from ball mill foundations. 4 – Mill Designer Stiffness Criteria. One of the mill designers performs a calculation to determine the "target stiffness" of the foundations given the mill and ring motor stiffnesses.
Sep 10, 2014· The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor for the 38 ft SAG mill had not failed. It too had an ABB motor and it had operated longer than the Collahuasi motor.
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
The level variation of electrolyte is pretty slow, which does not enable resistance to vary quickly enough for some specific applications (control of the slip for the ball mills for example). 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 ...
In December 2001, Gold Fields acquired the St. Ives project near Kalgoorlie, and only in 2003 did the new owner decide to go ahead with the project and to install the 36ft SAG mill and its gearless mill drive at St. Ives.
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 energyintensive production stages and therefore has a substantial energysaving potential. The main demands made on grinding
SAG mill Ring Motors Ball mill Ring Motors Frequency Converters High current rectifiers for EW tank houses Medium and high power synchronous motors ... » Routine maintenance, minor and major shutdowns in SAG GMD drives. » Dielectric recovery through the application of "Cryogenic Cleaning" in electric machines.
Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Standstill detection – Prevents the motors from restarting if the mill is still rocking or moving after a stop ...
Variable Speed . Single or double pinion driving systems. 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.
Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of any grinding mill. They must carry the load of the shell assembly ...
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