Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a polyphase voltage with the frequency f1 into a single or polyphase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from Hz up to about 6 Hz.
With the largescale development of the ball mill, the directdrive gearless ball mill has emerged, eliminating the limitation of the transmission torque of large gear. However, it is difficult to process, transport, install and maintain the gearless ball mill because of its vast volume, and the coils cannot be decoupled freely.
Significant energy and cost economies can be achieved with a gearless mill drive working with a ball mill in these upper power ranges. This prospect should also be of interest to the cement industry. The technology is available for an upsizing of cement grinding installations and the gearless mill drive is a proven, reliable drive.
0:00 / 3:19 Introduction ABB gearless mill drives ABB in Mining subscribers Subscribe views 4 years ago https:///mining/grinding/g... | ABB ensures maximum throughput,...
With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings. ... even for ball mills where these are not seen yet as a must. The initial capital costs are higher than ...
Ball mill driven with gearless mill drive. Abstract: This paper introduces how PT Semen Bosowa/Indonesia considered the installation of a cement plant gearless mill drive, the criteria for the selection of the gearless mill drive versus traditional solutions, the technology developed for this particular application and the conclusion drawn from ...
These are SAG mills with m diameter and 28 MW GMD drive and ball mills with m diameter and 22 MW GMD drives. The first production line is set to go into operation in 2022. ... Chile´s Minera Los Pelambres Ltda. is operating a new SAG mill and a new ball mill equipped with gearless drives systems by Siemens. The mills are intended to ...
Siemens' gearless drive technology of to % as confirmed by real operational data from the Antapaccay mine in Peru. It was the first plant worldwide to use gearless drives for both applications. KEYWORDS Gearless Mill Drives, Gearless Conveyor Drives, Availability, SAG Mill, Ball Mill, Overland Conveyor, Antapaccay 15
The gearless drive comprises a synchronous motor designed to operate at low variable frequency from a cycloconverter power supply (CCV). ... (flotation feed) for a typical 36,364 mtpd (40,000 stpd) semiautogenous ball mill circuit treating a copper porphyry ore. Capital costs were developed for the above two fixed speed drives and for the five ...
Gearless motor for a highpower mill. Fig. 8. Power circuit topology of a cycloconverterfed mill drive with two threephase windings. Fig. 7. Power circuit topology of a cycloconverterfed mill drive with one Fig. 9.
Significant energy and cost economies can be achieved with a gearless mill. 444 drive working with a ball mill in these upper power ranges. This prospect should also be of interest to the cement industry. The technology is available for an upsizing of cement grinding installationsand the gearless mill drive is a proven, reliable drive.
The delivery includes a gearless mill drive (GMD) ball mill, the first GMD mill to be delivered to China and the most powerful ball mill ever made. TankCells® and High Rate Thickeners to be delivered are highcapacity equipment, reducing embedded carbon and increasing overall plant availability. Two of the thickeners are for tailings and are ...
The mill used for this comparison is a diameter by meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 per hour. This type twocompartment mill is a state oftheart shell supported cement finish mill. The torque and time requirements of the mill with the ball
ABB continuously extends technical and performance frontiers of ringgeared mill drive (RMD) technology to fit your site requirements. We provide optimized mill drive solutions for all types of ringgeared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and low maintenance ...
The mill liner design pattern has a high/low design and has 78 rows per circle. FIGURE 9 FIGURE 10 illustrates the use of the Rajamani program for a 40 ft ( m) diameter mill operating with a 13% ball charge. The mill is turning at rpm (approxi mately 74% ) and has a 20 degree angle on the lifter bar.
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Combine ABB's variablespeed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ringgeared mill drives (RMD) or gearless mill drives (GMD). This solution was designed to control, stabilize and ...
At Los Bronces, part of the Anglo American Chile company, Siemens supplies a 22 MW gearless drive for a 40foot SAG mill and two MW gearless drives for two 26foot ball mills. Thanks to this development project, Los Bronces will be one of the biggest copper and molybdenum mines worldwide.
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, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant. eBook: Grinding transformation
Over recent years, there has been a clear trend toward higher capacity cement production units. Five to ten years ago 2500 tons per day was large. Nowadays in Asia, lines are built for 10000 tons per day. The development of ball mill grinding units has not shown the same trend; output and ratings have remained more or less constant perhaps due to the success of pregrinding with high pressure ...
Extracting Potential with Gearless Mill Drives and Gearless Conveyor Drives Global Mining Review May/June 2020 (English pdf Article) Conveyors: durable and continuous (English pdf Article) The benefits of modern drives (English pdf Article) Gearless drives for mediumpower belt conveyors (English pdf Article)
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