GE Large Induction Motors

7/28/2019 GE Large Induction Motors

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GEMotors

Series9000Large Synchronous Machines

Up to 15,000 VoltsUp to 100,000 HP (75,000 kW)

4 Pole and AboveMotors and Generators


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Experience is CriticalWeve manufactured motors for over 100 years.GE Motors has the capability to design and manufacture electrical rotating

machines up to 100,000 HP, and have supplied over 800,000 HP of motors

for variable speed applications. This century of achievement has built a rich

tradition of technical excellence, quality and reliability.

Standards & CertificationsGE has the capability to design electrical rotating machines that comply

with global standards and certifications, including but not limited to NEMA,

IEC, API, Lloyds, ABS, ATEX and PTB. Imperial (english) or metric systems

compliant components are available per customer specification.

Our manufacturing facilities are ISO 9001 certified.

Why Synchronous Motors?

High efficiency - increased operating cost savings

Low starting current - provides better overall starting capability,which reduces the starting equipment cost.

Unity or leading power factor reduced utility penaltiesassociated with lagging power factor.

Reduced current pulsations for non-steady-state loads, e.g.,reciprocating compressors - improved electrical system reliability.

ApplicationsCompressors, grinding mills, metal rolling, mine hoists, refiners, propulsion,

fans, pumps, generators and many others.

Industries- Oil & Gas - Cement - Pulp & Paper

- Mining - Metal - Water & Wastewater

- Power & Energy - Marine - Other Process Industries

GE Advantages

Quality

GE motors are legendary for their eff iciency, reliability and long life.

Global Presence

GE is a global company with operations in over 100 countries andmanufacturing facilities in 32 countries

Investing in Products That Customers Need

Our innovative 4 and 6 pole rotor design made from a single-forgingprovides maximum reliability.

Our unique QuadramaticTM load sharing motor system for dramaticallyimproved performance and less wear than traditional grinding mill systems.

Our unique Rotector II system gathers real time readings and directmeasurements to help optimize performance at all times.


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Ventilation, Enclosures & Assembly

Enclosure NEMA IP Code IC Code

Open Open IP00 IC-01Drip Proof DP IP12 IC-01Drip Proof, Fully Guarded DPFG IP22 IC-01Drip Proof, Guarded DPG IP22 IC-01Splash Proof SP IP23 IC-01Weather Protected I WPI IP23 IC-01Weather Protected II WPII IP24 IC-01Totally Enclosed, Water to Air Cooled TEWAC IP54 ICW-81Totally Enclosed, Air to Air Cooled TEAAC IP54 IC-616Totally Enclosed, Force Ventilated TEFV IP54 IC-37Totally Enclosed, Inert Gas Filled TEWIGF IP54 ICW-81

All of the above total enclosed options are available with pressure and/or purge systems to hazardous location classifications.

Weather Protected Enclosure(WPI, WPII, IP24, IC-01)

Totally Enclosed, Force Ventilated Enclosure(TEFV, IP54, IC-37)

Totally Enclosed, Water-to-Air Cooled Enclosure(TEWAC, IP54, ICW-86)

Totally Enclosed Air-to-Air Cooled Enclosure(TEAAC, IP54, IC-48)


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Stator Construction

StatorThe fabricated steel plate statorframe consists of two or more sideplates continuously welded to thewrapper plates and rectangular steelblock feet to provide a rigid statorsupport. The strength of this framemaintains a uniform air gap underall operational stresses.

Stator laminations are precision-punched from high-quality low-losselectrical sheet steel which are coatedwith a thermally stable insulation film(C5 coating) to minimize eddy current

losses. The laminations are assem-bled in accurate alignment within thestator frame to form the stator core.Ventilation ducts are formed fromsturdy I beams spaced for strengthand noise control. The core is clampedunder heavy uniform pressure in theframe to prevent distortion. The result-ing assembled stator structure hassuperior strength and rigidity, whichwill promote quiet performance, longlife and trouble-free operation.

Bracket FrameStatorGE Motors can manufacture bracketbearing machines up to 67,000 HP(50,000 kW) and offers pedestalbearing machines throughout ourproduct range.

The bracket frame is similar in con-struction to the Pedestal machines,except that the frame extends pastthe end of the winding in order tomount heavy gauge fabricatedsteel endshields and the bearings.This type of machine has the corepiled outside of the frame. The coreis wound and then mounted intothe frame.

BracingRigid support of the stator coil ends iscritical to the ability of the machineto withstand the mechanical forcescaused by starting, external shortcircuits and impact loading. GEsbracing systems are specificallydesigned for the machine application,

and use materials and processes togive optimum strength to withstandthe applied mechanical forces.

Insulation is KeyThe advanced insulation systemprovided on all large motor productwill reward you with many years ofreliable operation, whether on f ixedor adjustable speed applications.

GEs insulation systems are designeto minimize the effect of localizedelectrical stress and reduce theeffects of partial discharge, increas-ing machine life and reliability.Components are carefully chosenfor compatibility with the system asa whole. The insulation system is

subjected to rigorous testing according to applicable IEEE, IEC, NEMAand API standards.

All but the very largest wound stato

undergo global vacuum-pressureimpregnation (VPI) treatment. Thisprocess employs automated capactance monitoring to ensure that eacstator winding is fully impregnatedwith epoxy resin. After curing, it bindthe stator components into a solidand rigid structure with excellentdielectric strength, dimensionalstability, and mechanical strength.It also increases the resistance of thwinding to thermal shock, moistureand other contaminants.

Adjustable frequency drives canplace additional stresses on themachines insulation system.GE has significant experience withthese technical requirements and isable to tailor the motor and motorinsulation systems to meet themost demanding applications.

Bracket bearing machine construction

Complete stator assemblymounted in frame.

Pre-wound stator core readyfor vaccuum pressureimpregnation (VPI)

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Rotor Construction

High Speed4-6 Pole Solid Rotors

High speed rotors need maximumstrength and stiffness to provide along life. GE Motors makes its highspeed rotor from a solid cylindricalforging and machines out the polebodies and pole tips. The field wind-ings are edge wound copper stripswith dimensionally stable insulationmaterial bonded between the turns.Every turn has mechanically lockedand brazed corner joints for maxi-mum strength and every other turn islarger for more efficient cooling.

GE Solid Rotor Design Benefits

High thermal capacity morefrequent starts and/or high load

inertia capability

High operating efficiency leadsto minimal operating costs

Fewer components

Reduced mechanical stress

Improved mechanical stabilityfrom minimal vibration levels

Proven experience froma technology innovator

Medium Speed8-14 Pole Rotor Construction

Medium speed machine shafts aremanufactured of forged or rolledsteel and machined to exact applica-tion specifications. The shaft endsare normally cylindrical, taperedor flanged.

Low SpeedGreater than 14 poles

Low speed machine designs areanother strength for GE Motors.Our rotor designs typically includea forged steel shaft along with afabricated steel hub, web and rim tosupport the field windings. The rimdiameter and thickness is selected tosuit the inertia requirements as wellas meet the electrical requirementsof the design. Field windings areoptimized to suit the applicationutilizing rectangular copper wire orcopper strip all provided with our

well-proven Class F insulation system.The amortisseur winding design, akey to reliability, is also optimizedto suit the specific application.

4 and 6 pole solid rotor construction

Strip wound field poles,are slid onto the spiderand locked into place with steel keys.

Slow speed bolted poleQuadramaticTM rotorconstruction

A 4-pole rotor startsas a single, stepped

forging.

The shaft ,spider andthe 4 poles and poletips are created bymachining awaypart of the forging.

The stripwound fieldwinding is added tocomplete the rotor.

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Customer Solutions

QuadramaticLoad Sharing Drive

For grinding mill applications,GE has developed a drive using two,high efficiency, synchronous motordriven pinions on one bull gear.A Quadramatic load sharing driveuses a special winding in addition tothe amortisseur winding to dynami-cally alter the rotor flux. Thesecontinuous adjustments maintainthe load sharing between the twopinions reducing wear andimproving performance.

ExcitationBrushless Excitation System

This arrangement is generally usedacross all segments of industry as itrequires minimal maintenance and iswell suited for hazardous or contami-nated environments. The solid statecomponents utilized are liberallyrated and chosen specifically toendure the high mechanical andelectrical stresses experienced onthe most challenging applications.

Collector Ring ExcitationThis arrangement consists of carbon

steel or stainless steel slip ringsmounted on, and insulated from, therotor shaft. The rings have a groovedsurface to ensure effective coolingand proper current sharing amongthe brushes. Depending upon currentloading, additional cooling can beprovided by means of annular cool-ing fins. This arrangement is com-monly used on high performancevariable speed motor applicationswhere a particularly fast responsemay be required.

Rotector IIFaster Startups.

Reduced Downtime.Rotector II is designed tocontinuously monitor and protectlarge machines from potentiallycatastrophic failures. By monitoringthe field winding temperature, keycomponent temperature and f ieldwinding insulation resistance, down-time can be minimized and mainte-nance can be scheduled at the firstsign of potential problems. Byemploying the latest digital teleme-try, Rotector II offers a significant

advancement over older analogtechniques. The result is high dataintegrity and accuracy even in themost difficult environments experi-enced by large machines.

Rotector II provides improved rotorprotection in the following ways:

Real time field current andvoltage readings.

Direct temperature measurementof key rotor components.

First fault rotor ground faultdetection during operation orwhile stationary.

Diode failure detection.

All these features minimize commis-sioning time, increase reliability,reduce maintenance costs and allowoptimized performance at all times.

Pick-up Loop

Rotor

Rotector II

Transmitter

Interface Module

Rotector II

Receiver

Series 90/30GE Fanuc PLC

Machine Mounted

Serial Data Cable

Mounted Remote

from Machine

Close up of a Quadrature Axis windingon a bi-directional rotor

Brushless exciter contruction completewith starting resistor.


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Bearings, Enhancements, Testing

Bearings Cylindrical, two lobe or four lobe

sleeve bearings

Tilting pad bearings

Axial thrust bearings - horizontaland vertical

Both pedestal and bracket bearingmachines are available based onapplication requirements.

Lubrication

Oil ring and/or flood lubrication

High pressure lift option available

Run down tanks

Enhancements Partial Discharge Sensor Kits Air RTD (Resistance Temperature

Detectors) Space Heaters 50/60 Hz,

up to 550 volts Large oversized fabricated steel

main terminal box - framemounted or freestandingarrangements are both available.

Surge arrestors and/orSurge Capacitors

Current and Potential Transformers Vibration monitoring equipment Couplings

Every machine is equippedwith Resistance TemperatureDetectors (RTD) to monitor statorwinding temperature.

TestingGE Motors has a world class testfacility at Peterborough. Extensiveexperience in the performance ofrotating machinery with all forms offixed and variable-speed drives hasbeen accumulated. Each machine istested at the factory before installa-tion in the field, thus reducing set-uptime. GE Motors can also performsystems tests with a drive and usingback to back testing.

In Process testing

Complete Electrical Tests

Mechanical Testing includingrunout

Back to Back Testing

Efficiency Measurements

Complete system test with drivesand transformers

Custom conduit box complete with lightningarresters, surge capacitors and currenttransformers.

Every machine is tested in-housein a state-of-the-art facility to fulfillrequested standards includingstringent API requirements.

Pedestal Sleeve bearing

Solid 6 pole machine, with pedestal bearings,brushless exciter and rotating dischargestarting resistors after final testing.

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GE Motors

Fort Wayne, IN 46802

Motors 800 541 7191

Parts 800 458 0451

www.gemotors.com

8 2007 General Electric Company All Rights Reserved.GE andg are trademarks of General Electric Company.

DEA-M1045 1207

The right solutionfor your application.

High Efficiency Designs Pro-Engineer Systems Modeling On-site Research and Development Quadramatic Load Sharing Solid Integral Pole Tip High Speed

Rotor Design 50 MVA of test capabilities

The right peoplefor your solution.

Power Solutions TeamExperienced application engineers areavailable to solve your toughest motoror generator systems problems.

Large Motors Services TeamDo you have equipment over 20 years old?Do you need more from existing motors?Would you like to know what conditionyour motors are in?Call us, we can help!

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GE Large Induction Motors

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