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Gearless Mill Drive Comparison

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When it Comes to Mining Bigger is Best

When It Comes To Mining Bigger Is Best

mill startup and allows features like fro-zen charge protection, controlled roll back and positioning for mill mainte-nance needs. Figure 6 Full vacuum pressure impregnation for windings. Figure 4 Ring-geared mill drive solutions. Figure 5 Gearless mill drive solution. Throughout the comminution process, different mills are driven

advantages of gearless drives on ball mills

Advantages Of Gearless Drives On Ball Mills

The gearless design for drive systems first used in a mill in 1969 and then a belt conveyor ... Gearless drives also offer an energy-efficiency advantage. ... a 29 MW drive for the 40-foot SAG mill and two 22 MW drives for the 28-foot ball mills. Get Price.

Gearless Mill Drive Protection Improvements and Its

Gearless Mill Drive Protection Improvements And Its

Abstract A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or failures. For demanding applications in the mining industry, protections systems need to be reviewed considering special or abnormal operating conditions as well as the need of high system ...

Advantages of Gearless Motor Drives in Large Ore

Advantages Of Gearless Motor Drives In Large Ore

Nov 25, 2009 Gearless motors up to 22 MW are in service in many of these ore processing plants. Gearless motor drives are also known as ring motors or wrap around motors. The motor consists of a large number of magnets placed circumferentially on the shell of the grinding mill. This is similar to the rotor of a conventional motor.

gearless mill drives Archives International Mining

Gearless Mill Drives Archives International Mining

The 1.2 billion expansion, which saw throughput rise from 60,000 td to 120,000 td, involved the addition of two new thyssenkrupp-made ball mills, with ABB providing the gearless mill drives GMD technology. This came on top of the 33 mills the miner already had up and running as part of the existing 60,000 td plant at the operation.

Lowspeed Gearless Converter Drive 911 Metallurgist

Lowspeed Gearless Converter Drive 911 Metallurgist

Apr 06, 2019 The mill is of the two-compartment type, is 16.5 m long and has a diameter of 4.6 metres. The drive was designed for a speed of 14.6 r.p.m. The reasons prompting the use of a gearless drive were the limited space available, and the difficulties experienced in that factory with large gear units.

ABB gearless mill drive system to power SAG mill

Abb Gearless Mill Drive System To Power Sag Mill

Sep 01, 2010 ABB gearless mill drive systems feature numerous benefits when compared with conventional geared drive systems superior reliability, increased process availability, extended life span and improved energy efficiency. ABB delivered the world s first gearless machine drive in 1969, which is still operating at the Ciment Lamberg-Lafarge cement ...

Geared Hub Motors vs Direct Drive Hub Motors Himiway

Geared Hub Motors Vs Direct Drive Hub Motors Himiway

Nov 16, 2020 Geared Hub Motors. The geared hub motor and the stator are connected through a gear reduction system. Each time its case rotates, the internal gear rotates many times at a faster speed. This allows the motor to work at a faster and more efficient speed, while also allowing the wheels to spin at a relatively low speed. Direct Drive Hub Motors.

Update on JHEP SAG Mill Drive Selection Gear Strength

Update On Jhep Sag Mill Drive Selection Gear Strength

Comparison of AGMA standards for spurhelical gears ... Concrete madness - foundations of SAG Mill gearless drive A gearless drive will require about 250 more concrete and more importantly more reinforcing steel in the foundations than the equivalent dual pinion drive This picture shows only what is above the ground.

Our History as Comminution Consultants DJB Consultants

Our History As Comminution Consultants Djb Consultants

1983 Conceptual study and pilot plant test work for the first 36 ft dia. SAG Mill with a GMD Gearless mill drive, or ring motor at 15,000 hp and commissioned in 1991. 1986 Development and successful implementation of a Bond Work Index-based methodology for estimating power requirements for SAG milling and secondary Ball milling.

ABB gearless mill drive amp digital services help increase

Abb Gearless Mill Drive Amp Digital Services Help Increase

Jan 09, 2019 The company selected ABBs 26 MW gearless mill drive system GMD for the mines 40 ft SAG mill, as well as other drives, electrical infrastructure equipment and a long-term service agreement LTSA. This is expected to reduce operating costs, improve process throughput and reliability while saving energy and keep equipment in top form.

An electrical impact study between variable speed dual

An Electrical Impact Study Between Variable Speed Dual

Oct 22, 2015 When mill power is between 18 and 20 MW, which is the current manufacturing limit of ring geared mills 2, either a gearless mill drive GMD or a ring geared mill with dual pinion motors can be chosen. Selecting between gearless or ring geared design is mostly dependent on size of the mill and power and speed requirements 3.

ABB to supply gearless mill drive to mine in Chile

Abb To Supply Gearless Mill Drive To Mine In Chile

Feb 28, 2011 ABB gearless mill drive systems feature numerous benefits when compared with conventional geared drive systems superior reliability also with weak networks, increased process availability, extended life span and improved energy efficiency. Furthermore the system brings advantages such as optimal space conditions, a minimum number of spare ...

Manufacturers Of Inching Drive Parts For Ball Mills

Manufacturers Of Inching Drive Parts For Ball Mills

ball mill inching drive ball mill nz crushing plant risk assessment mining equipment comparison. il manufacturer wear parts include roller mill tires, allis chalmers ball mill As a professional crushing and grinding equipments manufacturer, length. 14 rpm with inching drive. parts, hammer crusher parts, ball grinding mill

Increasing availability through advanced Gearless Drive

Increasing Availability Through Advanced Gearless Drive

The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in figure 1. Figure 1 Top view of SAG mills with alternative drive options left side dual pinion drive including motor, gearbox, pinion and girth gear

Updates on geared vs gearless drive solutions for grinding

Updates On Geared Vs Gearless Drive Solutions For Grinding

Worlds largest geared drive 2x8500kW Wushan, China operating Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive option 60 to 80 critical speed, which is required for process reasons.

PDF General comparison of direct and geared drives for

Pdf General Comparison Of Direct And Geared Drives For

The first gearless mill has recently been put into service in Le Havre, France. This is probably the worlds largest cement mill. The cement output is rated at 200 tonh, and the motor rating is ...

Preprint 13050

Preprint 13050

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 customerconsultant 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.

Literature Review Gearless Motor Failures A Mill

Literature Review Gearless Motor Failures A Mill

Sep 10, 2014 1 Ring Motor and Mill Complexities. We have been fortunate to undertake detailed mechanical and structural design reviews and audits of all mill types from the five major mill vendors and of ring motors from both the gearless drive vendors. We have also been hired by mine owners to determine the causes of most of the major modern mill and ...


Gearless Drive For Cement Mill Ag Brown Boveri

A gearless drive for the drum of a cement mill or the like wherein the pole wheel, i.e. the rotor of a low-speed electric motor surrounds the drum and is connected to it by a circumferential array of uniformly spaced studs which project radially from the drum and are received in a similar array of uniformly spaced recesses located in the pole wheel structure.

Gearless Mill Drive systems for copper mine in Zambia

Gearless Mill Drive Systems For Copper Mine In Zambia

Up to 300,000 tons of copper will be mined at Sentinel, one of FQMs flagship plants. For copper mines of this size, reliable, high efficiency mills are top priority. FQM has opted for Siemens Gearless Mill Drives to be used in the two SAG mills having a diameter of 40 feet and an output of 28 MW and the two ball mills with a diameter of 28 feet and an output of 22 MW. With these mill drive ...

PDF Operation of HighPower CycloconverterFed Gearless

Pdf Operation Of Highpower Cycloconverterfed Gearless

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.

VFD dimensioning High altitude MB Drive Services

Vfd Dimensioning High Altitude Mb Drive Services

Apr 14, 2020 Figure 4 Gearless Mill Drive GMD, courtesy of ABB Figure 4 shows a typical gearless mill drive GMD featuring so called ring motor introduced in 1969 by ABB the rotor poles are fixed directly to the mill shell and the stator is wrapped around it.

Siemens expands mining portfolio to include gearless drive

Siemens Expands Mining Portfolio To Include Gearless Drive

Aug 28, 2010 Siemens expands mining portfolio to include gearless drive system for 42-foot SAG mills. Siemens is now able to provide to mining companies a gearless drive system for SAG mills with a tube diameter of 42 feet. This enables throughput to be almost doubled in comparison with the 38-foot mills commonly used today.

VFD Industry Requirements Mining and Minerals MB Drive

Vfd Industry Requirements Mining And Minerals Mb Drive

Jul 17, 2021 Ball mills, semi-autogenous SAG mills, high pressure grinding rolls HPGR, ring-geared mill drives RMD and gearless mill drives GMD BallSAG mills with up to 8000 kW per motor, typically geared solutions high-speed using asynchronous motors with 6-8 poles and rated speed 1000 1800 rpm

Gearless Mill Drives Beneficiation Siemens Global

Gearless Mill Drives Beneficiation Siemens Global

Aug 31, 2021 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 Engineering And Process Effects Of

The definition of mill speed that the process engineer should specify to the motor designer or vendor is mill speed as RPM, revolutions per minute. The motor designer or vendor will convert the specified rated mill speed into the speed of the motor, rated as Hz, which for a Gearless Mill Drive is simply RPM 60. For a gear driven ...

When it Comes to Mining Bigger is Best PTE

When It Comes To Mining Bigger Is Best Pte

Gearless mill drive. The limitation of an RMD system was overcome by ABB when it introduced the first gearless mill drive GMD in 1969 for the cement industry. ABB introduced the first GMD into the minerals industry in 1985 and since then it has become the de facto standard equipment for mines with larger throughput requirements.


Technical And Commercial Benefits Of Gearless Mill

A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or ...

Instability in gearless mill drive motors

Instability In Gearless Mill Drive Motors

Instability in gearless mill drive motors by Peter Warner, Anglo American Technical Division In 2006 Anglo Platinum ordered two 26-foot ball mills from FFE Minerals Vecor and two 17,5 MW gearless mill drives GMDs from ABB for the 600 kilo tonne per month concentrator for the Potgietersrust Platinum North expansion project.

SAG Mill Variable Speed Drive 911 Metallurgist

Sag Mill Variable Speed Drive 911 Metallurgist

Jul 18, 2018 The drive enables the mill to run on the utility at fixed speed for optimum efficiency or in the event of malfunction of the LCI. Drive Reliability. The gearless drive is probably the most reliable of all drive options mentioned herein. Elimination of gears and motor bearings remove these items from the list of potential problem areas.

Drive Technology Drive and Automation Technology

Drive Technology Drive And Automation Technology

This solution, integrated into the gearless Simine Mill GD mill drive, made it possible to selectively release charge that had clumped onto the mills interior wall, thus keeping the mill from being damaged if the charge were to drop uncontrolled and shortening maintenance times considerably. At a production value of several thousand US dollars ...

Gearless AGSAG Mills Metso Automation PDF Catalogs

Gearless Agsag Mills Metso Automation Pdf Catalogs

Metso Minerals Industries, Inc. 240 Arch Street, P.O. Box 15312 York, Pennsylvania , USA 17405-7312 Phone 1 717 843 8671 Fax 1 717 845 5154 www.metsominerals.com E-mail mineralsprocessing.infometso.com Gearless Autogenous Semi-Autogenous Mills

BRUSH Synchronous Condenser Systems Product

Brush Synchronous Condenser Systems Product

gearless mill drive systems used for grinding in mines. This eliminates the amount of reactive power to be supplied by the utility, thereby eliminating payment of penalties and associated costs. A synchronous condenser rotor provides the inertia to support grid frequency. The excitation current of a synchronous

ABB Industrial IoT applications Internet of Things

Abb Industrial Iot Applications Internet Of Things

ABB receives an automatically generated e-mail indicating a problem with a gearless mill drive Data analysis shows that the device will probably fail within 8 days ABB solution Based on the data analysis, the customer was advised to immediately interrupt production for 30 min to clean dust filters to survive operation until next planned outage