what are ring motors for sag mills

  • SAG Mill Grinding Circuit Design

    Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating StrategiesThe design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the Finite Element method the required factors of safety would make large mills prohibitively expensive.In the past the design of small mills, up to +/- 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. As the diameter and length of mills increased several crit.
  • Sag Mill Synchronous Motors Henan Mining

    Sag Mill Synchronous Motors Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.

  • Ring gear drives huge grinding mill Machine Design

    Motors & Drives; Ring gear drives huge grinding mill. By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and

  • Mill (grinding) Wikipedia

    SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

  • Related items : Mortar and pestle, Expeller, Extruder
  • INNOVATION NEWS Mills and GMDs ABB Ltd

    Mills and GMDs Maarten van de Vijfeijken* looks at large, larger and the largest units in grinding ore T he 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. The stator of the gearless motor is then wrapped around the mill

  • Paper # 25 Copper Mountain Overview on the

    COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES SAG mill rated motor speed 204 rpm, max. motor speed 214 rpm Ball mill rated motor speed 195 rpm, max. motor speed 209 rpm Starting torque: 150% for 15 s Main voltage level where the drive system is connected: 25 kV Excitation power is provided by a 4.16 kV bus As the power requirements for the SAG

  • Design and dynamic behavior of large Ring Motors for

    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.

  • ABB ring geared mill drives YouTube

    05/06/2013· ABB continuously extends technical and performance frontiers of ring-geared mill drive technology to fit site requirements. We provide optimized mill drive solutions for all types of ring-geared

  • Auteur : ABB
  • Gearless mill drives Grinding ABB

    Our 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 becomes the rotor of the gearless motor. The motor is fed by a fuse-less cycloconverter that is connected to the MV

  • Grinding mills SKD

    Every mining operation has a unique grinding process. SKD 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 start-up, operation, and optimization of your mill.

  • Advantages of SER drives for SAG mills GoHz

    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

  • TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

    TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M the synchronous motors used in SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill

  • AYCA Services SAG mill Ring Motors A&CA

    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 PLC control and automation systems Industrial and HMI communication networks Industrial Plants Integral Maintenance . Technical Assistance » Preventive and Corrective Integral Maintenance. » Routine

  • Autogenous and Semi-Autogenous Mills

    AG/SAG mills are normally used to grind run-offmine ore or primary crusher product. Feed size to the mill is limited to that size which can be practically conveyed and introduced into the mill. The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a ball mill, pebble mill, or

  • ring motor sag mill humidity-consult.be

    drive motors for grinding mills. the synchronous motors used in SAG mills have a Dual high speed slip ring motors can be used to drive through . Ring gear drives huge grinding mill Mechanical Drives . Ring gear drives huge grinding mill. By this summer, Loed at Kennecott Utah Copper near Salt Lake, this mill uses a ring-motor GET PRICE

  • Grinding Mill Gear Assembly Mineral Processing

    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. Anything gear and pinion really. The discharge end of the mill; For the

  • Sag Mill Trunnion Lube Ring Gear Lube

    Custom built sag and ball mill lubrication system this sag mill trunnion bearing lubrication system was custom built for our customers specific application sag mill, ball mill, ring gear, dual pinion, drive systems, variable speed sag mill lube.

  • Current Issues on High-Power Cycloconverter fed Gearless

    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-cently, ball mills are also being considered. This work addresses some current issues involving design and application of high-power drives employed in SAG grind-

  • Mill Dual Motor Sag Mills MC World.INC

    Our grinding mills include VM Vertical grinding mill, MTW European grinding mill, T130X Super fine grinding mill, HGM Micro powder grinding mill, TGM Trapezium grinding mill, Hammer mill and Ball mill, which can be used for Processing Limestone, Quartz, Calcite, Gypsum, Dolomite, Barite, Talc, Coal, Calcium Carbonate, Slag, Iron Ore, Gold Ore, etc.

  • Mining Grinding and Processing WEG

    Induction motors. For ball and SAG /AG mills with a single or double pinion, motors with squirrel cage rotor are normally used when constant speed and low starting current are required. WEG induction motors (Master Line) are designed with air cooling system (totally enclosed air-air cooling) or water cooling system (totally enclosed air-water

  • Grinding Mill Gear Assembly Mineral Processing

    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. Anything gear and pinion really. The discharge end of the mill; For the

  • Current Issues on High-Power Cycloconverter fed Gearless

    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-cently, ball mills are also being considered. This work addresses some current issues involving design and application of high-power drives employed in SAG grind-

  • Used Sag-mills For Sale A.M. King

    Buy used Sag-mills from A.M. King Industries. We can help guide you to the best solution for your equipment needs.

  • GRINDING MILLS-SAG MILLS-New & Used Mining

    SAG mills are essentially autogenous mills, but utilize grinding balls in addition to large rocks to aid in grinding. A SAG mill is generally used as a primary or first stage grinding solution. SAG mills are used at gold, copper and platinum mines with applications also in

  • Ok Tedi plans for long term with SAG mill upgrades

    For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units. The VSDs are fitted with cell bypass

  • ABB to deliver three large gearless mill drives for

    ABB’s scope of supply consists of three complete GMD systems including transformers, ring motors and E-house. One 26 megawatt GMD system will be installed for a 40-foot diameter SAG mill, while two 20.5 megawatt GMD systems will be installed to drive two 27-foot diameter ball mills.

  • Gearless Mill Drives Beneficiation Siemens

    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)

  • ABB successfully commissions world’s largest

    ABB’s scope of supply included four dual pinion low-speed mill drive systems for two semiautogenous (SAG) and two ball mills, each consisting of two synchronous motors, converter transformers and ACS6000 frequency converters including active rectifier units that allow the mill drives to achieve a power factor of 0.90 leading. ABB also

  • Selecting Inching Drives for Mill and Kiln Applications

    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, i.e. 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

  • Slip ring motors

    Most slip-ring motors that leave our plant in Germany are special adaptation specimens for example motors that are no longer being produced by large companies such as Siemens, or ABB. Typically, these are single slip-ring motors that are electrically and mechanically identical to older models.

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