Products

sag mill motor complete stator

Cadia GMD Stator: Observed Behaviour and Modelling

02/10/2014  The Stator Behaviour The Cadia SAG mill diameter is 40 ft and the ring motor that drives the mill is rated at 20 MW. In 1998 when the mill and motor were commissioned both were the largest machines of their type in the world. The stator exhibited vibration excursions that appeared to be related to the mill speed.

More

Modeling and Evaluation of Cycloconverter-Fed Two-Stator ...

10/12/2014  Abstract:Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30° shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and two six-pulse cycloconverters.

More

Gearless mill drives - Grinding ABB

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, service-friendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.

More

MC installs stator coil connections on massive mill ...

MC’s scope of work comprised the installation of stator quadrant windings on the four mill motors, which were manufactured by Siemens. The four motors are Gearless Mill Drives (GMD), also known as wrap-around motors, and include two 26 MW ball mill motors and two 28 MW SAG mill motors. Among the challenges on this project were the remote location of the mine,

More

The Siemens 42ft gearless mill drive, still an ...

Figure 1: 1955, Siemens Motor with welded fixation of the stator core The fixation of the laminated iron core by welding it to the stator housing has a proven track record decades long and has been applied to the 42ft GMD Ring motor. Figure 2: Welded laminated iron core of a Siemens Ring-Motor; view inside the housing Another proven design element is the cooling system of the ring motor ...

More

(PDF) Evaluation of synchronous motors on grinding mills

Ball mills and SAG mills, vertica l ... To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor

More

Modeling and Evaluation of Cycloconverter-Fed Two-Stator ...

10/12/2014  This paper presents and evaluates three different modeling options for the SAG mill drive. The first option considers a complete model in phase and qd0 variables of the two-stator-winding synchronous motor fed by two six-pulse cycloconverters. The second option develops a winding rotation transformation to obtain an equivalent one-stator ...

More

Cadia GMD Stator: Observed Behaviour and Modelling

02/10/2014  The Stator Behaviour. The Cadia SAG mill diameter is 40 ft and the ring motor that drives the mill is rated at 20 MW. In 1998 when the mill and motor were commissioned both were the largest machines of their type in the world. The stator exhibited vibration excursions that appeared to be related to the mill speed. We determined the mode shape of the vibration using approximately 25 ...

More

Gearless mill drives - Grinding ABB

Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. The motor is fed by a fuse-less cycloconverter that is connected to the MV network through three special cycloconverter ...

More

Gearless Mill Drive Protection Improvements and Its ...

motor stator and the motor rotor. The concept to drive the mill this way is relatively simple using the mill body as motor rotor and mounting the poles there. As a result the motor does not have a separate (motor) rotor and thus no separate (motor) bearings. Furthermore, there are no real design limits, neither in the electrical part nor in the mechanical considerations, allowing scalability ...

More

(PDF) Evaluation of synchronous motors on grinding mills

Ball mills and SAG mills, vertica l ... To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor terminals. Vector-controlled ...

More

The Siemens 42ft gearless mill drive, still an ...

Figure 1: 1955, Siemens Motor with welded fixation of the stator core The fixation of the laminated iron core by welding it to the stator housing has a proven track record decades long and has been applied to the 42ft GMD Ring motor. Figure 2: Welded laminated iron core of a Siemens Ring-Motor; view inside the housing Another proven design element is the cooling system of the ring motor ...

More

:: MC Installs Stator Coil Connections in Zambia

MC’s scope of work comprised the installation of stator quadrant windings on the four mill motors, which were manufactured by Siemens in Germany. The four motors are gearless mill drives (GMDs), also known as wrap-around motors, and include two 26MW ball mill motors and two 28MW SAG mill motors. Among the challenges on this project were the remote location of the mine, which is located ...

More

Gearless Drives - Siemens

SaG mill at Minera los Pelambres, chile. 4 SaG mill at Minera Peñasquito, Mexico: the spirit of innovation has been integral for the development of gearless drives Cover S T ory > Co NT e NTS > Gearless Drives July 2011 3 Dear Readers, Mining is a very challenging business. And the main requirements to succeed in this business – especially in the face of changing market conditions – are ...

More

This paper has developed three model options for a vector ...

This paper has developed three model options for a vector-controlled two-stator-winding synchronous motor fed by a SAG mill drive with two six-pulse cycloconverters.The first model considers a qd 0 model of the two-stator-winding motor and two six-pulse cycloconverters, therefore obtaining the exact same signals of the drive. The second model uses a novel winding rotation transformation and ...

More

Difference Between Sag Mill vs Ball Mill - mech4study

12/10/2017  SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially. Interior of the drum uses the lifting plates. These plates ...

More

Design and dynamic behavior of large Ring Motors for ...

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. The magnetic field and the motor torque deform the stator of the motor. The stator ovalization leads to additional air gap deformation, which must be kept between limit values. To avoid excessive vibrations, the ...

More

(PDF) Evaluation of synchronous motors on grinding mills

Ball mills and SAG mills, vertica l ... To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor

More

TMdrive -10SPR Product Application Guide

Slip Power Recovery Drive System for a grinding mill SAG Mill and Motor The Best Solution: TMdrive-10SPR for each pump • The SPR drive carrying slip power is much smaller and less expensive than an MV drive carrying all the motor power at full speed (4 kV voltage) • The SPR drive has a smaller footprint than a large stator supply drive • Inherent fault tolerance - a

More

Gearless Drives - Siemens

SaG mill at Minera los Pelambres, chile. 4 SaG mill at Minera Peñasquito, Mexico: the spirit of innovation has been integral for the development of gearless drives Cover S T ory > Co NT e NTS > Gearless Drives July 2011 3 Dear Readers, Mining is a very challenging business. And the main requirements to succeed in this business – especially in the face of changing market

More

Modeling and Evaluation of Cycloconverter-Fed Two-Stator ...

Request PDF Modeling and Evaluation of Cycloconverter-Fed Two-Stator-Winding SAG Mill Drive—Part I: Modeling Options A detailed evaluation of a SAG mill

More

Failure Prediction of Induction Motors: A Case Study using ...

CSLGH900/6-214, 5.8 MW, 11 kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine By C. K. Amuzuvi H. Warden University of Mines and Technology . Abstract- This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited,

More

Uneven SAG Mill Drive Power Draw - Grinding ...

To participate in the 911Metallurgist Forums, be sure to JOIN LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to

More

AC Motor Basic Stator and Rotor Operation Diagrams

An AC motor has two basic electrical parts: a "stator" and a "rotor" as shown in Figure 8. The stator is in the stationary electrical component. It consists of a group of individual electro-magnets arranged in such a way that they form a hollow cylinder, with one pole of each magnet facing toward the center of the group. The term, "stator" is derived from the word stationary. The stator

More

Services AC Winding Solutions

AC HV Induction Motors: Rewedge, Repair, Rewind and Install We specialize in the Installation and repair of Gearless Motor Drive Mills-Sag Mill stator windings-Ball Mill stator windings Mechanical. AC Winding Solutions provides Mechanical supervisors, fitters and Boilermakers for on field services, which are able to provide the expertise in the installation, dismantling and

More

The Hot Issue of Motor Temperature Ratings ECM

- Lacing string that binds the end turns of the motor. - Slot liners (in the stator laminations) that protect the wire from chafing. - Top sticks that hold the wire down in place inside the stator slots. - Varnish that manufacturers dip the completed assembly in, prior to baking it. The dipping varnish seals nicks or scratches that may occur during the winding process. The varnish also binds ...

More

A Mechatronic Solution Design and Experience with Large ...

The SAG mill drive is normally designed and optimized for the individual project. The requirement of the special process defines the size of the drive, the reques ted power and the operating speed range. The electric motor creates tension forces in the air gap that tries to pull the stator towards the rotor. Therefore the stiffness of the in-

More

II-100 II-101 INTRODUCTION

remedial measures [1,2]. The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive components. During this work, the characteristics of the SAG mill system were measured. The resonant frequency of the foundation was determined using an amplitude decay technique. Vibrations in the SAG mill stator

More

Failure Prediction of Induction Motors: A Case Study using ...

CSLGH900/6-214, 5.8 MW, 11 kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine By C. K. Amuzuvi H. Warden University of Mines and Technology . Abstract- This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited,

More

Gearless Drives - Siemens

SaG mill at Minera los Pelambres, chile. 4 SaG mill at Minera Peñasquito, Mexico: the spirit of innovation has been integral for the development of gearless drives Cover S T ory > Co NT e NTS > Gearless Drives July 2011 3 Dear Readers, Mining is a very challenging business. And the main requirements to succeed in this business – especially in the face of changing market

More

How digitalized gearless drive technology results in ...

GMDs mount rotor poles directly to the mill body and surround it with the stator ring, incorporating the mill itself into the motor. The necessary torque is transmitted between the GMD motor and the mill via the magnetic field in the tiny air gap between the stator and rotor. This type of motor system requires no gearing or direct contact transmission, meaning GMDs

More

Turn-Mill Machining Tech Improves Industrial Motor ...

01/01/2017  One key motor component is the rotor shaft that installs a stator. Antonio Lassandro, Siemens Norwood’s senior manufacturing engineer, says rotors for these motors range from 5 to 13 feet long and have diameters from 8.5 to 20 inches. Made from steel forgings, these rotors (which the team there has nicknamed “logs”) can weigh as much as 6,000 pounds.

More

ROTOR STATOR - Schold Manufacturing

Our Variable-Speed Rotor Stator was designed for high-speed dispersing, mixing, size reduction and deagglomerating at significant process savings. Requiring liquid in the batch at all times, the rotor stator creates mechanical shear by continuously drawing product components into the rotor and expelling them radially through the precision milled openings in the stator. The rotor stator ...

More

This paper has developed three model options for a vector ...

This paper has developed three model options for a vector-controlled two-stator-winding synchronous motor fed by a SAG mill drive with two six-pulse cycloconverters.The first model considers a qd 0 model of the two-stator-winding motor and two six-pulse cycloconverters, therefore obtaining the exact same signals of the drive. The second model uses a novel

More

The Hot Issue of Motor Temperature Ratings ECM

- Lacing string that binds the end turns of the motor. - Slot liners (in the stator laminations) that protect the wire from chafing. - Top sticks that hold the wire down in place inside the stator slots. - Varnish that manufacturers dip the completed assembly in, prior to baking it. The dipping varnish seals nicks or scratches that may occur during the winding process. The varnish also binds ...

More

Three Phase Induction Motor: Types, Working, and Applications

The number of poles of a motor depends on the internal connection of the stator winding and it will decide the speed of the motor. If the number of poles is greater, the speed will less and if the number of poles is lesser than the speed will high. The poles are always in pairs. Therefore, the total number of poles always an even number. The relation between synchronous speed and

More