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Why using a starter for slip ring motors. In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting torque. Higher is the inertia, higher has to be the accelerating torque, otherwise the start will be very long and the motor can be damaged by the heating. If the motor is started directly ...

The synchronous motor is a type of AC motor that runs at synchronous speed. The asynchronous motor is a type of AC motor that runs on speed less than the synchronous speed. It operates on the principle of magnetic interlocking between rotor and stator field. It operates on the principle of electromagnetic induction between stator and rotor.

Ring-geared mill drive system High performance and flexibility in grinding Decreasing global mineral resources, exploitation of lower ore grades in more remote locations and extreme environmental conditions lead to increased material processing and potential rise in CAPEX.

Motor Handbook 8 Laminations (Rotor Core): Thin silicon steel (ca. 0.2~0.7 mm), reducing eddy-current losses. End-ring: Connecting rotor bars at …

Lubricant Data: Masbate Gold Project's SAG mill uses Compounded Gear Oil as their main lubricant. But a different class of Gear oil is use in every operating system of the SAG mill. SAG Mill Components Type Characteristic Motor Bearings Omala 150 Gear oil. 150 viscosity at 40 C and 15 viscosity at 100˚C Gearbox Omala 320 Gear oil. 320 ...

The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)

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.

Ring motor driven SAG mill for gold ore grinding. SAG and ball mills for com-minuting gold/ copper ore. Site assembly of a large mill shell. 3 The design offers such benefits as: xElimination of castings and the structural risk associated with them. xFeed and discharge designed to process requirements rather

Zurich, Switzerland, July 30, 2013. ABB, the leading power and automation technology group, announced today the acquisition of Alstom's ring motor business to enhance its gearless mill drive ...

There are two GE motors for SAG mill but unfortunately sometimes current draw exceeds more than 300 A in one of them and makes SAG mill shut down. ... Connect the other lead from the voltmeter to K phase of the slip ring busbar on the other motor. Ensure connections and area is safe then turns 415v power on, proof 415V is available. Rotate the ...

ABB was awarded a multi-million contract to provide a 28 MW GMD for a 40 ft (12.2 m) SAG mill and two 22 MW drives for a pair of 28 ft (8.5 m) ball mills at Aktogay, and three identical systems at Bozshakol. Each includes phase and excitation transformers, a ring motor with a local mill control panel, and a containerised electrical house (E ...

Ring motors are much more complex than grinding mills and the simple remedies offered in the paper would not have avoided most of the past failures. It is shown that external influences and design culture were the root causes of most of the ring motor problems since 1996 and the problems in design culture also exist in some mill vendor design ...

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.

The SAG Mill is paired with a motor with a maximum power rating of 3,300kW. Using a power load of 2,800kW (500kW under the installed power), a 4.5% ball charge, the daily throughput is estimated a ...

A M King Industries has 3 more listings in 60 Hz Wound Rotor (slip ring-rotor) Motors. See All 8 Listings » Agitator Mixers and Blenders. ... Pebble, Sag Mills, Chemical Processing. See All 25 Listings » Bar and Rod Rolling Mills. 14 Results. Machinery & Equipment / Rolling Mill Equipment / Bar and Rod Rolling Mills.

Gearless or ring motor drives; Twin CCV or Cycloconverter; Twin ICI or Load Commutated Inverters using variable frequency; Quadramatic II LCI drive. For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a ring gear and single pinion arrangement.

Sag or ball mill heads components. Ferry Capitain is a well known company for the supply of large mill heads and trunnions with more than 40 years of history. From 40' Sag heads to smaller regrind mill heads, Ferry Capitain with its 2 foundries is able to offer a wide range of product all made and machined within the same Group.

SAG MILLING – Gearless drive system from ABB. WESTERN AUSTRALIA - Five years in storage have failed to affect the performance of the ABB gearless drive on a SAG mill at the St. Ives gold mine belonging to GOLD FIELDS of South Africa. The mill was originally ordered in May 1997, but shortly before the manufacturing was completed, the then ...

SAG mill with COMBIFLEX® drive for gold ore grinding. Ball mill with ring motor drive. Brake of a ring motor drive. 8 Flotation Wet grinding Grinding is one of the most energy-inten-sive production stages and therefore has a substantial energy-saving potential. The main demands made on grinding

The Aktogay 40 ft FLS manufactured SAG mill has a variable speed drive (VSD) ring motor with a total installed power of 28 megawatts (MW). The mill was lined in late December 2016 with a traditional OEM radial bi-directional liner system manufactured from chrome molybdenum steel and commissioned during the early months of 2017.

SAG Mill and Ball Mill Case Study. In September 2011, the company Outotec, located in Espoo (Finland), awarded Ingeteam a contract for the design and supply of the main drive equipment for a 2.3MW SAG mill and a 2.1MW ball mill to be installed in Russia. Outotec is a global leading company that designs and delivers turnkey projects in the ...

The ring motor is not self-supported and requires the mill to mount the rotor poles and needs the mill foundation to support the stator. In addition, considerations for mill load- ... SAG-Mill GMD delivered by Siemens. The aim of the test program was to identify all real natural frequencies in a modal analysis.

Cadia SAG Mill motor and ball mill gears Cadia GMD Stator: Preface The remedial design of the stator of the gearless mill drive (GMD) of the 40 ft SAG mill at Cadia Hill was …

The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...

SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally operate between 70 to 75% of the critical speed. Dry Aerofall mills are run at about 85% of the critical speed. ... for the 20 MW ring motor alone exceeding A$1M. View chapter Purchase book. Read full chapter.

Ball mills designed for long life and minimum maintenance overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 30' x 41' . and as much as 30,000 HP. Larger ball mills are available with dual pinion or ring motor drives. Our mills incorporate many of the qualities which have made the Marcy name famous since 1913.

Siemens tuned and evaluated their 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 …

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 …

A semiautogenous grinding mill (SAG) uses complementary steel balls of typical 5-inch diameter to support the grinding media. Fig. 2 shows the possible tra- jectories inside the mill.

SAG MILL ACE 8 SUCCESS STORY: ANTOFAGASTA PLC ... Set points Process information Set points and outputs Process and / or disturbance variables Valve, motor, and control signals Process measurement ... BrainWave is patented predictive technology that is capable of controlling multiple variables while conside-ring the effect of each adjustment on ...

Rewedge 13mw ball mill – AUSTRALIA. 18mw ball mill rewind ABB – CHILE. 12mw ABB/Alstom mill rewind – USA. 2x ABB / Alstom mills installations – USA. Sossego mine, mill Rewedge and coil change -BRAZIL. Sag mill rewind in Chile – CHILE. 2 x Sag mill installation, Sweden – SWEDEN. Rewedge ball mill in Nevada USA – USA

US3180581A US210975A US21097562A US3180581A US 3180581 A US3180581 A US 3180581A US 210975 A US210975 A US 210975A US 21097562 A US21097562 A US 21097562A US 3180581 A US3180581 A US 3180581A Authority US United States Prior art keywords trommel discharge annulus mill opening Prior art date Legal status (The …

Highly specialized services, solutions and technical assistance ensuring the operation's availability and reliability. 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

Highly specialized services, solutions and technical assistance ensuring. the operation's availability and reliability. 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.