ABB's new Gearless Mill Drive generation: Maintenance …

of GMD, first installed 4 years ago, operates very successfully today. The maintenance-friendly features deliver significant operating results. Remote monitoring tools are used …

Slip Energy Recovery of Induction Motor using Converter

Slip ring induction motor is used as a variable speed drive in SERIM scheme. The speed of SRIM can be easily control by simple & primitive method, mechanically variation of rotor circuit resistance. This method of speed control has is very inefficient because the slip energy is wasted in rotor circuit resistance. However, …

Recent Process Developments at the Phu Kham Copper …

a dual pinion 13 MW variable speed slip energy recovery/ hyper-synchronous drive 34 ft × 20 ft SAG mill in closed circuit with scats return conveying including a high-lift conveyor to overcome topography constraints. SAG mill discharge is classifi ed using an integral mill trommel, with minus 12 mm product reporting to a 1.85 MW cyclone feed ...

Gearless mill drives

• 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to …

SAG Mill Process Control

The purpose of a grinding mill is to convert electrical energy into rock breakage. The best use of that asset is to try to maximize the power draw. Try to hold the mill speed high and vary the feed rate to hold the weight (or bearing pressure), but watch out for "cycling" or "surging" that indicates instability in the charge.

SAG mill optimisation and increasing throughput at the …

The operation's comminution circuit, which comprises a semi-autogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to be SAG mill limited when treating competent basement rock. Ausenco Services Pty Ltd (Ausenco), was engaged to help optimise and enhance the productivity of the Phu Kham …

Hypersynchronous SER Drives | PulseTech

Background of our Technology Partner Our SER drives are manufactured by ElectroDrives, who is one of our trusted technology partners.. Electrodrives is based in Madrid-Getafe, Spain and is a global market leader in Slip Energy Recovery (SER) Drives for Slip Ring Motors that are mainly used in the mining industry especially for SAG Mills. Following …

ABB gearless mill drive system to power SAG mill

Summary. September 1, 2010 - ABB won an order from Newmont Mining Corporation to engineer three gearless mill drive (GMD) systems to be installed at the Yanacocha Minas Conga oxide copper gold project in Peru. Fluor Corporation in Santiago, Chile, will act as EPCM contractor for this important project; Corporation will be the mill supplier.

Slip energy recovery of a rotor-side field oriented …

Such a drive system is shown in Fig. 1 where the slip power is taken from the rotor circuit and returned to the grid via a matrix converter. The proposed drive system combines a matrix converter and rotor-side field oriented controlled wound-rotor induction motor in a slip energy recovery drive system as shown in Fig. 1. This drive …

Outotec presents the world's largest SAG mill

Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG ...

SAG Mill

The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator.It is used to process resources to produce dust. It accepts energy in the form of Redstone Flux or Minecraft Joule, with an …

Sectors

An example of potential improvement is found in SAG mills, where speed control can increase the amount of ore processed, drastically reduce mill liner wear and energy consumption. ... Particularly in equipment like pumps, compressors and blowers, our Slip Energy Recovery drives ensure maximum energy efficiency and cost savings. In …

ABB increasing milling power and availability with GMDs

Case studies: Aktogay and Bozshakol. ABB has partnered with Kaz Minerals to supply GMDs for the company's Aktogay and Bozshakol copper mines in Kazakhstan, both of which are expected to process 25 Mt/y of ore. 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 …

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS …

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

Performance improvement of a slip energy recovery drive …

In this paper, the performance improvement of a slip energy recovery drive with a voltage-controlled technique using a voltage source inverter can be achieved. The total harmonic distortion of the supply line current waveforms are reduced to 6.2% at slip 0.5 and 3.6 % at slip 0.2 respectively. The power factor obtained from SERD-VSI with a ...

Updates on geared vs gearless drive solutions for grinding mills

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. ... this paper uses the latest data in applying these comparisons and attempts to dispel some of the myths regarding Slip Energy Recovery ...

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 ...

to Build Largest SAG Mill for Newmont's Minas …

E&MJ reported in October 2010 (See "SAG Mill Gearless Drives Go to South American Projects,"p. 102) ABB Group's Minerals Division had won an order from Newmont Mining Corp. to engineer three gearless mill drive (GMD) systems to be installed at its Yanacocha Minas Conga oxide copper-gold project in Peru.

Benefits of continuous data acquisition from critical …

Motors (WRIM) using slip energy Recovery (SER) devices, with a typical motor shaft rated speed of 750 rpm up to 1200 rpm, depending on the electrical network (50 Hz or 60 Hz) …

(PDF) Operation Analysis of a SAG Mill under Different

the complete SAG mill is about 700 kW, which verifies the energy consumed by the mill is huge, and optimizing the parameters to reduce energy consumption is of great significance. According to

The Siemens 42ft gearless mill drive, still an …

sured on a real operating GMD at Goldcorp's Peñasquito mine in Mexico. The quality of the tuned FE-model is demonstrated by a Campbell diagram showing a very good correlation between measured and calculated natural fre-quencies. Keywords Gearless Mill Drive, GMD, 42ft Mill size, Siemens, condition monitoring, finite element analysis, ring motor.

Starter of SAG Mills with rotor resistance

As per Torque / Slip characteristic for AC Motor, the value of the Max. Torque can be developed is constant while the Starting Torque occurs @ S=.1, (T proportional to r2 and S also proportional to r2 where r2 is the rotor resistance, the ratio r2/x2 when equal to 1 gives the max. Torque w.r.t Slip at Starting.

ABB's new Gearless Mill Drive generation: Maintenance …

of GMD, first installed 4 years ago, operates very successfully today. The maintenance-friendly features deliver significant operating results. Remote monitoring tools are used to anticipate and predict possible malfunctioning/failures in the GMD at an early stage. Effective inputs are generated to plan longer term maintenance work accordingly.

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

sured on a real operating GMD at Goldcorp's Peñasquito mine in Mexico. The quality of the tuned FE-model is demonstrated by a Campbell diagram showing a very good …

Frozen charge detection and automatic loosening with …

dually set mill angle between 30° and 45° (see icon 6 in figure 4) – 30° are selected in Figure 5 – where a strong counter-torque is applied. This counter-torque of up to 130% (almost in figure 5) stops the mill shell imme-diately. The charge slips due to its high kinetic energy. For the case the charge does not slip at the first time,

Gearless mill drive (GMD) and digital services for Kinross …

The company selected ABB's 26 MW gearless mill drive system (GMD) for the mine's 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.

Ring-geared mill drives

Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still …

MOTOR TECHNOLOGY Saving energy

two for powering a new 10,000 kW SAG mill in Australia as shown in Figure 3. This installation includes: • Two 5000kW six-pole WRIMs with 11,000v stators • A combining …

Design SAG mill production when you need it most: In …

Cyclones work best when the cyclone feed size is limited to. 5 mm top size, as noted above when referring to screen selection. The product size is also a function of liberation and downstream requirements. SAG Mill ore hardness kWh/t: Energy required to grind an ore from F80 of 152 mm to T80 of 1.7 mm.

CMP Paper 16.10.09 Final

When mill diameter and mill power became again increased, only the Gearless Mill Drive (GMD) could be envisaged to cover this requirement above 10 MW. The GMD is by its …

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