The Siemens 42ft gearless mill drive, still an evolutionary …

ring motor FE-Model with the 19.3MW Gearless Mill Drive at the Peñasquito site in Mexi-co. Up to forty acceleration sensors have been placed inside the motor to measure the impact of two exciters attached at the top and the bottom of the motor housing. These tests provided a detailed frequency response and structural

SAG Mill Variable Speed Drive

Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but only one in North America (St. Lawrence Cement). Recently both Afton and Lornex in British Columbia installed variable speed …

Remote Diagnostic Services for Gearless Mill Drives

autogenous grinding (SAG) mills, or ball mills. The most important components of a GMD are the following ones: The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names "wrap-around motor" and "ring motor" (see Figure 1). Its purpose is to

SIMINE Gearless mill drives

Whether you're talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That's why we always design our Gearless mill drives drives to combine maximum performance with limited space requirements. Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this notice-

SAG Mill | Autogenous and Semi-Autogenous Mills

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

gearless ring motor for sag mill principles

gearless ring motor for sag mill principles. to Design and Supply the World's Largest SAG Mill in ... Oct 05, 2010· It is situated near the Newmont Yanacocha gold mine, where installed what was then the world's largest singlestage SAG mill, a 32ft x 32ft ( x ) EGL mill, driven by a ABB gearless motor, in 2008. That mill design was also …

Demystifying The Sag Mill: What Is It And How Does It Work?

A SAG mill, or semi-autogenous grinding mill, operates on the principle of autogenous or self-grinding. It uses a combination of ore and grinding media to break down larger rocks into smaller pieces. Understanding the working principles of a SAG mill is crucial for anyone involved in the mining industry. In this section, we will delve deeper ...

gearless ring motor for sag mill principles----About Us

SAG Mill Grinding Circuit Design - 911metallurgist - gearless ring motor for sag mill principles. Gearless drives (ringmotors) have been used on tumbling mills for several decades. marcy mill shells - zygomat.fr 13.5 x 4 ft (4 x 1.2 m) Marcy SAG mill with 300 HP - 13.5 x 4 ft shell - Originally designed for dry grinding - removed, disassembled, and in …

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.

gearless ring motor for sag mill principles

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.

ABB acquires ring motor business from Alstom

The motor power, so far, can go up to 28 megawatts for such an application. An infographic of the ring motor and further visual materials can be found here. Raw material from the crushing stage is typically fed to SAG (semi-autogenous), AG (autogenous) and ball mills for further processing to break the rock into smaller pieces. These mills are ...

ABB buys ring motor business to boost its gearless mill drives

30 July, 2013. ABB is buying Alstom's ring motor business to enhance its gearless mill drive (GMD) activities. The business, based in Bilbao, Spain, has about 120 employees and achieved a turnover of €57m in 2012/13. It will become part of ABB's Process Automation division. The financial details of the deal have not been revealed.

The engineering and process effects of choosing a …

Such plots for an example mill, the SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3. Any time a process line (green) touches or exceeds the corresponding motor limit (the red or blue lines), the motor is at risk of tripping due to high current, depending on the conditions. Safe operating of a mill and motor means that

SAG Mill Components

Another solution is to use the so-called "gearless drive." A cyclo-converter reduces the power frequency and a synchronous motor is either wrapped around shell or mounted on a trunnion extension. This makes the mill essentially a part of a synchronous .motor rotor with the stator in its usual position around the rotor.

Literature Review: Gearless Motor Failures – A Mill Designer…

The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel [8].

Gearless Ring Motor For Sag Mill Principles

Gearless Mill Drive SystemThe Gearless Mill Drive system consists of the ring motor with its feeding cyclconverter, pre-installed in an E-house. ... 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 ...

ABB's Gearless Mill Drive Ring Motor factory in Bilbao

Building on over 130 years of experience in the mining industry, ABB's Ring Motor factory located in Galindo provides the engineering and manufacturing of ring motors, the main component of ABB's Gearless Mill Drive (GMD) systems manufactured by ABB for the mining sector. The 20,000 m2 plant manufactured over 110 motors delivered in over 25 …

ABB Library

Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in …

A Mechatronic Solution Design and Experience with Large Gearless Mill …

In the mineral processing industry the use of large gearless cycloconverter drive systems for SAG-Mills has become more and more common in the recent years. Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimization of the process. The design of such large mill drive systems …

CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 …

1 CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL T. Orser1, V. Svalbonas 2 and *M. Van de Vijfeijken 3 1Newmont Mining Corporation 10101 East Dry Creek Road Englewood, CO 80112, USA 2Metso Corp. 2715 Pleasant Valley Rd.

(PDF) Current issues on high-power cycloconverter

Fig. 1, General scheme of a Gearless Mill Motor drive [24]. of the airgap is in the range of 15-17 mm. A tolerance of. +/- 3 mm is consi dered for setting alarm s and protections. The motor is fed ...

SAG MOTOR – Leadership by Technology and …

SAG Motor (Spain) S.L., located in the Basque Country, one of the most industrialized areas in Spain, is a high technology manufacturer for permanent magnets synchronous (PMS) gearless traction machines …

Mill drive selection for semiautogenous grinding mills

mill and gearless mill with a ringmo-tor are shown in Figs. 1 and 2. Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft ...

Gearless mill drives

The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.

ABB Library

Conga: The world's first 42-foot diameter 28 MW gearless SAG mill. ID: ... Maarten van de Vijfeijken The 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. ...

Gearless Sag Mill Slip Ring Motor

gearless ring motor for sag mill principles. Gearless Warp Around SAG Mill 911metallurgist Gearless Warp Around SAG Mill. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives [randpic] Gearless mill driv +86 [email protected] Quick Search: SERVICEY. Home; …

Operation of High-Power Cycloconverter-Fed Gearless Drives Under

Ring-motor-driven SAG mills in copper mines have shown frequent malfunctions in the past [3], [6], [7]. The problem is owed to the characteristics of the cycloconverter that feeds the synchronous ...

Catalogue – SAG MOTOR

SAG Motor, Leading the Elevation Gearless Traction Machines Industry through design, Technological Innovation and High Quality Production. CSAG-MV. Permanent Magnets Synchronous (PMS) Gearless Traction Machine ... SAG MOTOR (SPAIN) SL. Paseo Egiburuberri Nº13-O-U 20100 - Errenteria - Gipuzkoa (SPAIN) +34 943 528 394;

QdX4 Mill Drive system

system, and one for the OPEN MILL gearing. • A wide variety of lubricants are available. Millmotor/drive High powered efficiency •Dual motor load sharing between two TMMetso QdX4 Mill Drives. • Low speed synchronous or induction. Motor with Variable Speed Drive (VSD) • Dual motor drives are capable of: – Inching and creeping

MONSAG: A new monitoring system for measuring the load filling of a SAG

1.. IntroductionLower ore grades, variable grindability, mineral handling and economics state a challenge for current mining operations. Looking for economies of scale, new mining projects consider big mill grinding circuits, with large power gearless motor drives (GMD) fed by cycloconverters in the range around 20 MW (Sams et al., …