Figure 1 SAG Mill and synchronous motor. The complexity and in itial cost of a low speed sy nchronous motor and VFD is offset by the simplicity in . avoiding initial cost and maintenance ...

Ore Crushers / sag mill synchronous motors. 38' x 24.8' SAG Mill, ... the ore is crushed in a huge 40-foot semi-autogenous grinding ... We can supply Ball Mills, ... sag mill conference sell. Sag Mill Synchronous Motors. sag mill synchronous motors-related information, including: Quotes,Price,Manufacturers,Parts : detailed syllabus of kerala psc sub ... BALL MILl motor drive 4FT …

Synchronous motors are widely used in mill driving systems at a constant speed using an air clutch between the motor shaft and mill pinion to provide a smooth starting method. The use of synchronous motors can also provide power factor correction with external field excitation; they can be designed with a high number of poles so without using large and expensive gearboxes they can reach rate ...

2014-12-19· So at say 85% speed, 15% of the motor rated power is returned from the rotor to the supply. At a hyper-synchronous speed, the SER drive feeds power into the motor rotor allowing it to run faster than synchronous speed. So for a fixed torque and higher speed, the power obtained from the motor is higher than the motor nameplate rating.

The power to spin the mill comes from large electric motors coupled to mill shell through a clutch and gear system. These electricity consumed by these motors is the largest cost and inefficiency. Most of the power is converted to heat in the charge (load) and a small percentage into ore breakage. The feed end of the 13000 hp Fort Knox SAG mill. The mill is driven by two GE horizontal ...

On site we have a Sag Mill Driven by a 5500KW Motor. We have a vibration issue right across the Mill. The highest vibration is 30mm/sec RMS axial on the motor non drive end bearing.(White metal Bearing) The gear mesh frequency is 4200 CPM. The dominant frequency is 2400 CPM. We can not relate this to anything on the Mill or drive train but with ...

Sag Mill Synchronous Motors. Ore Crushers sag mill synchronous motors. 3839 x 24.839 SAG Mill, the ore is crushed in a huge 40foot semiautogenous grinding We can supply Ball Mills,

•Three commonly used mill motor types: –Gearless drives •largest size, up to 28 MW •highest efficiency –Synchronous with pinion •one or two pinion configuration, up to 15.6 MW –Induction motor with speed reducer •one or two pinion configuration •cheapest capital, but poorest electric efficiency

ac synchronous motor or dc motor. This flexibility, however, comes with an increase in capital and operating costs. Since the capital and operating costs of a project directly affect the project’s rate of return, the selection of a SAG mill and its drive system should depend, in part, on the impact that the extra cost makes on the project. This impact can be measured by performing an ...

surface of the mill flange. Typically, 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 Figure 2 presents the power circuit of a cycloconverter ...

The power to spin the mill comes from large electric motors coupled to mill shell through a clutch and gear system. These electricity consumed by these motors is the largest cost and inefficiency. Most of the power is converted to heat in the charge (load) and a small percentage into ore breakage. The feed end of the 13000 hp Fort Knox SAG mill. The mill is driven by two GE horizontal ...

SAG mill. Synchronous motor drive with air clutch. COMBIFLEX ® drive (5,400 kW) with high- speed synchronous motor and fluid coupling. Oil lubri-cated standar-dised pinion arrangement with Ring motor drive. induction motor. Hydrodynamic slide shoe bearing for individual requirement profiles. Preparation of measuring in a hydrodynamic slide shoe bearing. Measuring compaign at …

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 ...

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the …

SAG mills can operate at a fixed speed or adjustable speed through the use of ac synchronous motors or dc motors. They typically range up to 16,000-hp. A secondary, or ball mill, works a lot like ...

30 x 7 ft (9.1 x 2.1 m) Allis Chalmers ( Metso) SAG Mill components with 4079 HP motor, 200 RPM. Manufacturer: Allis-Chalmers; Allis Chalmers 30 x 7 ft SAG - Westinghouse AC brushless synchronous motor with spare stator: - 4079 HP (3000 kW) - 200 RPM - 3300 V - 50 Hz Mill includes: - Bull gear - Pinions - Lube units - Slide shoe bearings...

Synchronous Motors and Generators provide superior value in terms of proven reliability, low maintenance performance and long life in any application. They can be found wherever there is a demand for highly efficient, cost-effective, dependable machines and can be furnished with adjustable frequency drives for soft starting or speed regulation. With all of the advancements made in adjustable ...

•Three commonly used mill motor types: –Gearless drives •largest size, up to 28 MW •highest efficiency –Synchronous with pinion •one or two pinion configuration, up to 15.6 MW –Induction motor with speed reducer •one or two pinion configuration •cheapest capital, but poorest electric efficiency

Most mills (outside of Australia) use synchronous motors. These motor have the following characteristics (in general) The maximum power indicated on the name-plate is the power on the output shaft of the motor (or mill shell for gearless). The maximum power indicated can only be evolved at the rated speed indicated on the name-plate. Below the rated speed, the motor's available power reduces ...

surface of the mill flange. Typically, 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 Figure 2 presents the power circuit of a cycloconverter ...

Often is the notion to replace the Semi-Autogenous (SAG) mill drive phase-wound induction motor with an equivalent synchronous motor. This paper evaluated the correctness or otherwise of the motor replacement from the point of view of oscillations. The SAG mill drive motor was modelled and simulated using Matlab/Simulink software to ascertain the level of oscillation at start and in running ...

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 ...

1 x Metso SAG Mill & Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill Metso SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38’ x 26’) (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) Variable Speed Drive Yes Max.

2001-04-01· Gross SAG mill power is measured at a meter and includes the drive train power loss. This is a practical method of measurement because most SAG mills have a synchronous motor coupled directly to the pinion. Electrical and mechanical efficiency loss is only about 6% in such installations. The Kubaka grinding circuit was designed using SPI calibration work (originally presented at the SAG ’96 ...

Synchronous Motors and Generators provide superior value in terms of proven reliability, low maintenance performance and long life in any application. They can be found wherever there is a demand for highly efficient, cost-effective, dependable machines and can be furnished with adjustable frequency drives for soft starting or speed regulation. With all of the advancements made in adjustable ...

One only used AC Ball Mill with 2,000 HP synchronous motor & Rubber Liners. Mill is 1979 model... Get Price. Mineral Processing | Toshiba International Corporation - Oceania . Crusher Drives; Grinding Mill Drive Systems, SagBall etc; Slurry Pump Drives ... Equipment: 1 x 44000kW 30 pole 6600 volt Synchronous Motor ... Application: 1 x 11000kW SAG Mill driven by Dual 5500kW motors, 1 x …

A synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic field which rotates in time with the oscillations of the line ...