Most of our large mill drives >5MW per motor are WRIM, however we are now seeing a swing toward SCIM and VSD's as the cost of CAPEX for VSD's is decreasing, and operations are most sensitive to energy savings. A set of WRIM's running at 80% speed being controlled by an LRS is not the most energy efficient way to operate.

21-G Series Motors. TMdrive-10. TMdrive-10e2. TMdrive-30. TMdrive-50. TMdrive-70e2. AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose.

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This paper reviews various Mill drive configurations and improved synchronous motor characteristics when used with more advanced Current Source …

the electric motor to the selected mill speed and to transmit the torque created by the motor. Secondly, the gearbox has to transmit the grinding forces generated by the grinding rollers, from the mill table, through the gearbox, into the mill foundation. Today, most mills are equipped with bevel planetary gearbox -

The requirements of a kiln motor are the following: Power requirement is very high. Speed control ratio is 1:10. Very low creeping speeds of 1 rpm may be required. Starting torque should be in the range 200 to 250% of full load torque. The acceleration of the drive should be completed in about 15 s.

Abstract Grinding mill drives play an important role in the mining industry. Almost 60% of the electrical energy consumed by modern concentrator plants goes to grinding mill drives. Different technologies are used in grinding systems presenting special characteristics from the electrical and process points of view.

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concerning grinding mill drives, particularly the gear pinion and mechanical systems. For constant-speed applications, the interface, has been invaluable in giving criteria for specifying following systems were evaluated: large mill drive gear sets. wound-rotor motors with liquid rheostats, 111.

A large variety of driven machines are to be found in a sugar mill-fortunately these drives fall into only three basic types. In most mills the constant speed drives are accommodated by electric motors while steam units are resorted to for the Variable Speed applications. A brief survey will be made of the first two drives and special attention ...

Ore grinding mills are really just slowly rotating barrels, but barrels that are growing in size so fast that the application of electric drives for them is rapidly approaching a technology like that for wind tunnels or …

Choosing the Right Motors for your Mills Alex Doll and Derek Barratt DJB Consultants, Inc., Canada. Overview of Mill Selection •Grinding testwork to characterise the project's oretypes •Characterise hardness variability or load ... •Three commonly used mill motor types: –Gearless drives •largest size, up to 28 MW •highest efficiency

The mill used for this comparison is a 4.4-meter diameter by 13.6 meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 s.ton per hour. This type two-compartment mill is a state- of-the-art shell supported cement finish mill. The torque and time requirements of the mill with the ball

Rolling mill DC motors are best at low speed, high torque applications, while AC motors typically need to run above 800rpm to be cost effective. Also the case for higher efficiency of AC motors is many times negated by the wasteful braking methods of some AC drive systems. All this being said, for motors below 200-300kW, or when new …

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auxiliary drive, is an important component of any mill or kiln installation. It is used for maintenance and inspection purposes, as well as an emergency auxiliary drive to keep kilns rotating when the main motor fails. This paper covers what data the end user needs to provide for proper selection of a drive as well as

This paper describes a methodology for selection of spindle electric drives for milling machines with digital program control. The offered algorithm takes into account the technological process features, the tools used, the processed material, and the mechanical gear type. ... Twin Synchronous Motor Grinding Mill Drives: Performance Comparison ...

Motor The GMD is a drive system without any gear where the transmission of the torque between the motor and the mill is done through the magnetic field in the air gap between the motor stator and the motor rotor. The concept to drive the mill this way is relatively simple using the mill body as motor rotor and mounting the poles there.

This paper presents a technical evaluation and practical experience of two different technologies used in high power grinding mill drives. The analysis is focused …

(PDF) Technical Evaluation and Practical Experience of High-Power Grinding Mill Drives in Mining Applications PDF | Grinding mill drives play an important role in the mining industry....

The twin dc motor drive system with each motor connected to a pinion and each fed from a static thyristor power supply has been successfully installed and operated at the Lornex Mine in British Columbia on a 10.4 m (34 ft) mill rated at 9,325 kW (12,500 hp). ... They include costs of the entire grinding section including mills, drives ...

This paper reviews various Mill drive configurations and improved synchronous motor characteristics when used with more …

ABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills ... 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 ...

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1.0 Introduction In large grinding mills such as the mineral and cement industries where twin motor drives ... 1.0 Introduction In large grinding mills such as the mineral and cement industries where twin motor drives are used, the two major challenges which limit the use of two synchronous motors connected direct on line and mechanically ...

mill drive is in inching mode, one rotation of the mill is all you need. The mill will reach the exact angle that was preset by the operator, and the procedure does not need to be repeated. At the end of the inching operation, the SIMINE Gearless mill drive stops the mill with balanced charge, and with no time-wasting oscillations.In creep-

Mills and the motors and drives ... P.F.Thomas,G.A Grandy, S.H.Walters, Selection and Evaluation of Grinding Mill ... The subject of this paper is a synchronous drive of grinding ball mills 4 MW ...

Using only steam turbines in milling is not as efficient as using drives and motors to keep the machines running. By replacing traditional steam turbines with a high power motor and drive combination of up to 2 MW, you can save up to 50 per cent energy compared to traditional steam-turbines. Most sugarcane companies are self-sufficient in ...

the decision making process. This article examines how the NPC calculation, plus reliabil- ity and power source, influence SAG mill selection. SAG mill drives There are two types …

for starting, controlling and driving mills, with the optimum choice depending on the size of mill or power requirement. The selection between variable speed drive (VSD), direct-on …