The CCV – ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill
–Slip ring motor –High torque synchronous motor –Synchronous-slip ring induction motor. October 29, 2006 4 A. Ball Mill Drives ... D. GEARLESS BALL MILL DRIVE • For large mills, greater than 10'000 hp (speed from 13 to 15 1/min) October 29, 2006 8. October 29, 2006 9. October 29, 2006 10.
The gearless motor—also called a wrap-around motor or ring motor—is a large synchronous machine, which uses power electronics and a magnetic field to control the speed of the motor rotation. In early November, …
Zurich, 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 ...
Gearless Mill Drive Protection Improvements and Its. Laguna Seca concentrator uses a SAG mill and three ball mills all driven by gearless mill drive GMD systems Table 1 gives an overview of the basic technical data of the installed drives TABLE I MILLS AND THEIR DRIVES IN THE LAGUNA SECA PLANT Equipment Drive Comments SAG Mill Semiautogenous …
The scope of supply included a pair of slip ring motors of 9,000 kW at 1,000 rpm and another two motors of 7,500 kW also at 1,000 rpm and fully designed to be interchangeable with the old existing motors providing a smooth drop-in replacement. The motors are being applied in pairs to SAG and ball mills that operate through dual pinion drives ...
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 ...
SKU: L02040. Category: Grinding Mills. Description. Description. 21′ x 11′ Hardinge SAG mill with 2875 DC slip ring motor, inching drive, & lubrication located in South America. Equip yourself with the gold standard.
Lake Cowal is a gold mine in NSW operated under Evolution Mining. EMF has recently completed cleaning and inspecting the Ball and SAG mill gearless drive motors. This involves entering the motors through inspection hatches and meticulously brushing and vacuuming the internal windings along with a thorough inspection of the insulation, slip ring ...
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 ...
ABB will supply one 28 megawatt GMD for a 40-foot semiautogenous (SAG) mill and two 22 megawatt GMDs for two 28-foot ball mills. May 28, 2012 - ABB won an order worth $44 million to deliver three gearless mill drive systems (GMDs) for a new copper mine to be operated by Kazakhmys PLC (Kazakhmys) in southeastern Kazakhstan.
ABB's scope of supply consists of three complete GMD systems including transformers, ring motors and E-house. One 26 MW GMD system will be installed for a 40′ diameter SAG mill, while two 20.5 MW GMD systems will be installed to drive two 27′ diameter ball mills. In addition, Kinross ordered the new ABB GAP-Watch TM for each system. GAP ...
Gearless mill drives 26th June 2009 GMDs are used on the larger ball and semi-autogenous grinding (SAG) mills, where power transfer through the con- ventional gearbox, pinion and girth gear ...
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.
Presently the gearless drive is more costly than the complete mechanical portion (mill rotating element and accessories supplied by the mill manufacturers) and hence the customer/consultant needs to have two parties to deal with from the start of any project. There is an interface between the mill vendor and the gearless motor supplier.
sag mill drives girth gears at 18000 hp. ... ft (7.9 x 4.2 m) SAG Mill 6,300 HP (4700 kW) Motor Variable speed drive available at extra cost. Mill includes: - main drive motor Slip Ring 6,300 HP - liquid resistance starter, includes variable speed drive - feed hopper, bell housing, - jacking cradles, - hydraulic jacks and hoses, - Poly Deck ...
Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is …
The SIMINE Gearless mill drives pump system significantly enhances concentrator productivity by eliminating the reducer gear between motor and pump and all corresponding maintenance. In addition, the cyclone pumps with variable speed can adjust their energy consumption to the optimized flow of pulp, resulting in energy savings of up to 30%. The ...
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.
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 …
• Motor behavior during normal operation with a loaded mill The result is the design of a Gearless Mill Drive motor for a 42ft Grinding Mill providing up to 35MW of power. Evolution is still the main GMD design philosophy, but realistic and proven computer models help to look beyond experience, where testing is impossible.
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 rotor has salient poles without dumping windings and it consists of 72 …
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 …
Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust ...
Download scientific diagram | Gearless motor drive scheme. from publication: Technical Evaluation and Practical Experience of High-Power Grinding Mill Drives in Mining Applications | Grinding mill ...
China Jr Series Wound Rotor Slip Ring Motor Ball Mill Motor Jr127 8 130kw Find details about China Jr Motor Motor Winding from Jr Series Wound Rotor Slip Ring Motor . ... Mills SAG Ball Rod 4 piece ring gear feed chute motor not •Used 115 dia x 18 long Kennedy Van Saun ball mill steel lined ring and pinion gear .