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Special Electric Motors

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ContentsIntroduction Combimac 4 Specialelectricmotors 5

Submersible electric motors Surfacecooled 6 Forcedcooled 6

Permanent magnet motors 7

Direct current motors Conventional 8 Special 9

High-speed electric motors 9

Brake motors 10

Oil cooled electric motors 11 Surfacecooled Internallycooled Cannedmotors

Water cooled electric motors 11 Surfacecooled Cannedmotors

ATEX 12

Naval motors 14 Shockproofelectricmotors 14 Mildshock 14 Mediumshock 14 Highshock 15 Lowmagneticelectricmotors 16 Lowmagneticdesign 16 Lowmagneticstrayfieldcompensateddesign 16 Referencelist 18

Quality Assurance and Control 19

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Introduction

Combimac

Combimacisawhollyindependent,middlesizecompany,establishedinthenortheastpartoftheNetherlands,inthetownofEmmen.Asasupplierofelectricalprimemovers,Combimachasformanyyearsbeenaprominentmarketleader,derivingitsleadingpositionfromthefollowingproductgroups:

•Specialelectricmotors•Industrialandspecialfans

Combimac’skeywordisknowledgeandqualitycontrol.Indeeditisqualitythatdominatesthecompany’sentireproductionprocess,fromdesignuptodeliveryandbeyondinaftersales.AllnecessarymonitoringiscarriedoutbyCombimacinthecompany’sownlaboratory,thisbeingtheonlywayofachievingabsoluteaccuracy.Allworkiscarriedouttoestablishedqualityproceduresandstandards.Inshort,Combimacaimsforperfectionstrivingtoattaincontinuousquality.

Thankstothehighqualitystandards,provenovermanyyears,Combimachasbecomeanestablishedsubcontractorformanycompanies.Combimac’selectricmotors,installedinvesselsofmanyNaviesandvariousindustrialinstallationsworldwide,liveuptothehighestreputation.

Special electric motors

Features

AspreviouslymentionedoneofCombimac’smainproductsisarangeofspecialelectricmotors.Thefollowingtypesofelectricmotorscanbemanufactured:

•A-synchronousandsynchronousAC-motors•Single-phaseAC-motors•Directcurrentmotors•Lowmagneticmotors•Strayfieldcompensatedmotors•Immersibleandsubmersiblemotors•(Sea)watercooledmotors•Permanentmagnetmotors

Thefollowingfeaturescanalsobeincorporatedintothisrange:

•Shockprotectedupto300g•Flameproof(ATEX)•Increasedsafety(ATEX)•Nonsparking(ATEX)•Lownoiseandvibration•UptoIECframesize450

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Lowmagneticoilcooledmotor

Seawatercooledmotor

Submersible electric motorsBeingasupplierofcustommadeelectricmotorsformanyyears,Combimacisabletoofferseveralparticularelectricmotorrangesforvariousspecificdemands.Partsofthescopeofdeliveryaresubmersibleelectricmotorsforvariousapplications.Combimacsuppliestwomaintypesofsubmersibleelectricmotors:

•Surfacecooledelectricmotor•Forcedcooledelectricmotor

Surface cooled electric motorForcontinuoussubmersibleoperationoroperationonlywhensubmerged,Combimacprovidesawiderangeofsurfacecooledelectricmotors.Typicalapplicationsfortheseelectricmotorsaredredging-,deepwell-,andsewagepumps.Thesurfacecooledelectricmotorsprovidethefollowingfeatures:

•Dimensionsinacc.withIEC72•FramesizesuptoIEC450•Methodofcooling=IC4A1W0•MinimumprotectionclassIP67orIP68•InsulationclassFandH•Powerratingupto500kW•Mechanicalseals,lipseals,airbellconstruction

Forced cooled electric motorCombimachasdevelopedvariousvarietiesofforcedcooledelectricmotorstosuitimmersibleorsubmersibleapplications.Oftenelectricmotorshavetoperformtheirnominalpowerratingwhenrunningbothdryorwet.Astheseelectricmotorsarecontinuouslycooledbymeansofaforcedliquidflow,eitherwater,oiloranyotheravailablecoolingliquid,theycanprovidemaximumpowerbothinsubmergedanddryconditions.Otherfeaturesofthisdesignaretheverylowairbornenoiselevelsproducedbythesetypesofelectricmotorsandthelackofheatdissipationtoitsenvironmentthat,insomeinstances,canbeofvitalimportance.Alsobecauseoftheirmoreefficientcoolingcomparedwithair-cooledelectricmotorsahighoutputinsmallframesizesispossible.Thesetypesofelectricmotors,normallyprovidedwithIECstandardflangesandshaftextensions,canbefullymanufacturedinaccordancewiththecustomer’srequirements.Furthermoretheforcedcooledelectricmotorsprovidethefollowingfeatures:

•Coolingjacketavailableindifferentmaterials•Dimensionsinacc.withIEC72•Methodofcooling=IC7A1W7•FramesizesuptoIEC450•MinimumprotectionclassIP55orIP68•InsulationclassFandH•Powerratingupto500kW•Mechanicalseals,lipsealsandairbellconstruction

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Permanent magnet motorsTheuseofpermanentmagnetstocreateaconstantfluxintheairgap,resultsinsynchronousperformancewiththerobustdesignofanasynchronousinductionmotor.Thepermanentmagnetsaremadefromneodymiumironboron(NdFeB)orsamariumcobalt(SmCo).Bothmaterialsprovidethepowerfulmagneticmaterialatroomtemperature,withhighfluxdensityathighmagnetization.BasedonthesedesignfeaturesCombimacareabletoofferACpermanentmagnetmotors.

Applicationsthatrequirehightorqueatlowspeedsoftenusesynchronousmotorswithreducers,asstandardinductionmotorsgenerateplentyoftorque,butunfortunatelynotatlowspeeds.Thereforetheyarenotparticularlysuitedforlow-speedoperationbecausetheirefficiencydropswithreducedspeed.However,gearboxestakeupspace,reduceefficiencyandneedbothmaintenanceandconstantlubrication.Eliminatingthegearboxsavesspaceandinstallationcosts,energyandmaintenance,andprovidesmoreflexibilityinproductionlineandfacilitydesign.

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Synchronousmotordesignsusingpermanentmagnetsmakeitpossibletohavelowspeedandhightorqueinonepackage,eliminatinggearboxesandothermechanicalcomponents.Alsoforhighspeedapplicationspermanentmagnetmotorsprovideimprovedproperties.Becauseofitsnature,PMmachinescanbeusedbothasmotorandasgenerator.Asgeneratortheseareoftenusedin(super)yachts,whereitscompactnessandverylowheatemissionarewellvalued.Furthermore,thegeneratordoesnothavetorunatfixedspeedsof1500rpmor1800rpm;thespeedisbestchosentosuitthedieselengineorgasturbine.

Mainfeaturesprovidedbythesynchronousmotordesign:

•Automotiveliquidcooledorseawatercooled•Veryhighefficiency,evenat25%load•Veryhighpower-to-weightandpower-to-volumeratio•Uptomorethan4timesmorethanconventionalmotors•Hightorqueatlowspeed•SmallersizedhighspeedmotorWatercooledhighspeedPMmotor

PMmotor/generator

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Besidesalternatingcurrent(AC)electricmotorsCombimac,isabletosupplyawiderangeof:

•Conventionaldirectcurrent(DC)electricmotors•SpecialDC-motors

Conventional DC-motorsTheCombimacconventionalstandardrangeofDC-electricmotorsistotallyadaptedtothelatestmoderndesignstandards.IncorporatedinthespecificDC-motordesignareparts,whichhavebeenderiveddirectlyfromtheCombimacsquirrelcageelectricmotorsrange.Togetherwithamodernstatorcorewithlaminateddesign,theyprovidethefollowingfeatures:

Direct current motors •Dimensionsinacc.withIEC72•MinimumprotectiongradeIP44uptoIP68•Methodofcooling=IC4A1A1•Excellentcommutationproperties,alsoat

thyristorduty•Lownoise&vibrationlevels•Voltagerange

Special DC-motorsVariousapplications,forexamplesubmersiblebatterydrivendrivesonboardsilentrunningleisurecraftsinpollutionrestrictedareas,havespecialdemands.Durability,easymaintenanceandhighefficiencyrequirespecialsolutions.CombimacisabletoprovidethesesolutionswithDC-motorsdesignedspecificallyforthispurposeandrequirements.

Axialfanmotor DCfanmotorunit

High-speed electric motorsVarioushigh-speedelectricmotors,upto50.000rpmand150kWpowerrating,havebeendesignedandmanufacturedtomeetourcustomers’high-speedrequirements.Combimachigh-speedmotorsareoftenusedtodrivetestequipmentconnectedwithbearings,sealsandtransmissions.Furthermore,mostofthehigh-speedmotorshavebeendesignedtomeetthecustomers’individualinterfaceandmotorperformancerequirements.

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DC-motorsusedonboardsubmarines,whichshouldbeabletorunfromthebatteriesintheeventofapowerfailureonboardthesubmarines,isatotallydifferentapplicationdemandingadifferentspectrumofrequirementsandlimitingoperatingconditions.AgainCombimacisabletodesign,engineerandmanufacturesuitablemotorsforthesepurposes.

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Brake motors

Combimacisabletoofferawiderangeofelectricbrakemotorsforseveralapplicationsandinawidevarietyofdesignsandmodels.Brakemotorscanbothbeprovidedwithstoppingaswellasholdingbrakes.Stoppingbrakesarebeingusedforbrakingtherotarymovements,whilstholdingbrakesarebeingusedwhenafullylockedmotorisrequiredwhentheelectricmotorisnotbeingoperated.

Forvariousapplicationsandtocoverthespecialdemandsforelectricmotorsprovidedwithbrakes,Combimachassuppliedelectricbrakemotorsfor:

•Radarequipment•Bowthrusters•Winches•Elevators•Hangardoors•Sonarsystems

Combimaccanprovidethemajorityofitsdifferentelectricmotorrangeswithelectricbrakes.Electricbrakescanbefittedtoshockresistantmotors,aswellastothelowmagneticrangeofelectricmotors.Specialattentioninthiscaseisbeinggiventothemagneticsignature.

ElectricbrakescanbesuppliedforbothACorDCoperationandalsowithanadditionalmanualreleasefacility,toenablethereleaseofthebrakeintheeventofapowerfailureoranemergency.Avarietyofmanualreleasecanbeoffered,ascanbeseenonthedifferentexamplesshown.

WatercooledPMbrakemotor

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Oil cooled electric motorsMethod of cooling

Combimacdesignsandmanufacturesoilcooledelectricmotorswiththreedifferenttypesofcoolingmethods.Oneversionprovidessurfaceoilcoolingandtheotherversionshaveinternaloilcooling.

Surface cooledSurfaceoilcooledelectricmotorsareprovidewithaseparatecoolingjacket.Thecoolingoiliscoolingtheoutsideofthemotorstator,whereasthemotorinternalpartsaredryrunning.Toguaranteeasufficientamountofcooling,thecoolingmantlesaremanufacturedfrombronzealloyoraluminium.

Internally cooledUnlikesurfacecooledelectricmotors,thecoolingoilisrunningthroughthemotor,providinganoptimumcooling.Thecoolingoilatthesametimeisusedtolubricatethemotorbearings,oftenleadingtoasimplifiedelectricmotordesign.

Canned motorsAnotheroptionforaninternallycooledelectricmotoristohaveinternallyoilcooledmotors,providingtheuseofacan,thesocalledcannedmotors.Thismethodisusedtopreventthestatorwindinggettingincontactwithapossiblyaggressivecoolingmediumtoavoidanyriskofdeteriorationofthewindings.

Method of cooling

Combimacdesignsandmanufactureswatercooledelectricmotorswithtwodifferenttypesofcoolingmethods.Oneversionprovidessurfacewatercoolingandtheotherversionprovidesinternalwatercooling.

Surface cooledSurfacewatercooledelectricmotorsareprovidewithaseparatecoolingjacketontheoutsideofthemotor.Thecoolingwateriscoolingtheoutsideofthemotorstator,whereasthemotorinternalpartsremaindryrunning.Thecoolingmantlesdependingonthetypeofwater,forexamplefreshorseawater,canbemanufacturedfromavarietyofmaterials.Otherfeaturesofthisdesignaretheverylowairbornenoiselevelsproducedbythesetypesofelectricmotorsandthelackofheatdissipationtoitsenvironmentthat,insomeinstances,canbeofvitalimportance.Alsobecauseoftheirmoreefficientcoolingcomparedwithair-cooledelectricmotorsahighoutputinsmallframesizesispossible.

Canned motorsThesameprincipleusedinoilcooledmotorscanbeusedinwatercooledmotors.Usingacanpreventsthestatorwindinggettingincontactwithapossiblyaggressivecoolingmediumtoavoidanyriskofdeteriorationofthewindings.

Water cooled electric motors

Surfacecooledmotor

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Electric motors in accordance with ATEX 2014/34/EU

ATEX

FortheapplicationofelectricmotorsinhazardousenvironmentsCombimacisabletodesignandmanufactureelectricmotorsinaccordancewiththeATEX2014/34/EUdirective.ExplosionprotectionforelectricmotorstoIEC60079areclassifiedinaccordancewiththefollowingcategoriesprotectiontypes.

Flameproof enclosure “d” ElectricmotorapparatusdestinedforZones1and2(IEC60079-14),ElectricalEquipmentforHazardousAreas(exceptformines).TheconstructionalrequirementsareinaccordancewithIEC60079-1.Theprotectionconceptisdefinedsothatallpotentialignitionsourcesarehousedinsideaflameproofenclosure.Unavoidablesealingsurfacesarethereforedesignedasflameproofjoints,sothat,incaseofignitionofanexplosiveatmosphereinsidetheenclosure,theexplosiveatmosphereisnottransferredtothepotentiallyexplosiveatmospheresurroundingtheenclosure.Theapplicationisforalltypeofmotors,suchassquirrelcage,commutator,permanentmagnetandallmodesofoperations(S1toS9).Suitablealsoforseverestartingconditionsandvariablespeeddrives.

Increased safety “eb”ElectricmotorapparatusdestinedforZones1and2.TheconstructionalrequirementsareinaccordancewithIEC60079-7.Theprotectionconceptdefines,stepsmustbetakentoensurethatthecreationofsparks,electricarcsandinadmissibleheatingprocessesispreventedduringproperoperationoftheapparatus.

Theapplicationisonlyforsquirrelcagemotorswithadaptedmotorprotectionswitches.

Increased safety “ec” ElectricmotorapparatusdestinedforZone2.TheconstructionalrequirementsareinaccordancewithIEC60079-7.Theprotectionconceptisdefinedas,undernormaloperationconditions,nosparks,electricarcsorinadmissibletemperaturesmayoccur.Theapplicationisforalltypesofelectricmotorswithmotorprotectionswitchesandoverpressuremonitoring.PreventionofsparkscreatedundernormaloperatingconditionsshouldbeimplementedandManufacturers’informationaboutthesemeasuresisprovided.BoththeflameproofandincreasedsafetyrequireanEUtypetestingcertificatefromanaccreditedNotifiedBody.Thisisnotrequiredforthenon-sparkingversions.Combimacisabletoofferall3types,includingthenecessarytypetestingcertificates.

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Naval motors

Forvariousnavalapplications,forexamplepumps,compressors,fansorwinches,CombimacsuppliesthefollowingtypeofasynchronousAC,shockresistant,electricmotorsinaccordancewiththefollowingclassifications:

•Mildshock-GeneralRuggedness•Mediumshock•Highshock

Everyelectricmotorrangeprovidesitsownfeaturestosuittherequirementssuchasshock,lownoise&vibrationandperformanceforeachtypeofapplication.

Mild shockCombimacelectricmotorswhicharedesignedtomeetmildshockorgeneralruggednessrequirementsforstandardapplicationsaretotallyenclosedfancooledmotors.Designedtomeetnavalrequirementsonshockandlownoise&vibration.

Medium shockCombimacelectricmotors,whicharedesignedtomeethighershockdemands,suchasforexample,theCombimactype50meettheBritishMODstandardNSSII.AsaresultofthishighershockresistanceallIECframesizesupto400Laremanufacturedfromnodularcastiron.FormorestringentweightrequirementsCombimacisabletobuildmotorsmeetingthesameshocklevels.TheCombimacaluminiumtype60motorsarederivedfromthetype50motorsmeetingrelativelyhighshocklevels,howeveraimingforalowermassandthereforeprovidingalowweight,highshockresistantmotor.

Shockproof electric motors

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Closedcoupledhighshockbatwingmotor

Thislowweightadvantagecanbeexploitedevenmorebydesigningitclosecoupledtotheequipmentwhichhastobedriven,asdoneonmanyoccasionsforseveralpumpmanufacturers.

High shockCombimacelectricmotorshavebeendevelopedanddesignedovertheyearstomeetthemoststringentshocklevelsand,ifrequired,combinedwithultralownoise&vibrationlevels.Themotorsoftenconsistoutofacompletelysteelweldedconstructionthatmakesthemsuitableformeetingshockfiguresupto340g.Thesemotorsarethereforeoftenusedonboardsubmarines.Furthermorethisparticulardesigncaneasilybeadaptedtomeetoperationinhazardousenvironmentsbydevelopingitintoaflameproof,increasedsafetyornon-sparkingdesign.

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ForuseonboardMCMV’s(MineCounterMeasureVessel)suchasminehuntersand-sweepers,whichrequireelectricmotorswithalowmagneticandacousticsignatureCombimachasdevelopedtwomainrangesoflowmagneticelectricmotors:

•LowmagneticAC-motor•LowmagneticstrayfieldcompensatedAC-motor

Low magnetic electric motor designCombimaclowmagneticelectricmotorsaremanufactured,asfarastechnicallypossible,fromlowmagneticmaterials.Alsothedesignandtheelectricalconfigurationissetupinsuchawaythatthestrayfieldandacousticsignatureiskepttoaminimum.TheCombimaclowmagneticelectricmotorsprovidethefollowingfeatures:

Low magnetic electric motors

•Shockprotectedstandardupto30g•Dimensionsinacc.withIEC72•Methodofcooling=IC4A1A1•Minimumprotectionclass=IP55uptoIP68•InsulationclassFandH

Low magnetic and strayfield compensated electric motor designCombimaclowmagneticstrayfieldcompensatedelectricmotorsrepresentthelatestdevelopmenttominimizetheemanatingmagneticstrayfieldsofelectricmotors.TheCombimaclowmagneticstrayfieldcompensatedelectricmotorsprovideasignificantreductioninthestrayfieldlevelswithouttheuseofsophisticatedelectronicsoradditionalferromagneticmaterials.Furthermoreitdoesnotrequireanyadditionalspaceorlargerframesizes.

Naval motors

Lowmagneticstrayfield

compensatedbrakemotor

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Asthecompensationisanintegratedpartofthemotor,themagnitudeofcompensationfollowsautomaticallytheloadoftheelectricmotorwithouttheuseofsophisticatedandvulnerableelectronics.Soprovidinganoptimalprotectionagainstthethreatofstrayfieldsensitivemines.FurthermoreCombimaclowmagneticandstrayfieldcompensatedelectricmotorsprovidethesamefeaturesasthelowmagneticmotors.

ThegeneraldesignofthedevelopedCombimaclowmagneticstrayfieldcompensatedelectricmotorisinaccordancewiththelatestrequirementsandtechnicalstandards.Thefollowingtypesofmotorshavebeendevelopedoutofthebasicdesign:totallyenclosedmotors,seawatercooledmotors,submersibleandimmersiblemotors.

Lowmagneticstrayfield

compensatedbrakemotor

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Reference list

Surface ships•S,L,GW,MandLCF-frigates(Netherlands)•Halifaxclasspatrolfrigates(Canada)•F123,F124,F125-frigates(Germany)•K130corvettes(Germany)•T21,T22andT23-frigates(UK)•Invincibleclassaircraftcarrier(UK)•T42,T45-destroyers(UK)•FortGeorgeclassAOR(UK)•LPD(UK)•ANZAC-frigates(Australiaand NewZealand)•MEKO®100corvettes(Malaysia)•F100frigates(Spain)•Visbyclasscorvettes(Sweden)•KDX-II,KDX-IIIdestroyers(Korea)•MEKO®200frigates(SouthAfrica,Algeria)•MEKO®A200corvettes(SouthAfrica)•CVFAircraftcarrier(UK)•Type26frigates(UK)

Minehunter and -sweepers•Tripartiteminehunters(Netherlands, BelgiumandFrance)•SingleRoleminehunters(UKand SaudiArabia)•Oksoy/Altaclassminehuntersand -sweepers(Norway)•Tripartiteminehunters(Indonesiaand Pakistan)•Ospreyclassminehunters(USA)•Styrsöclassminehunters(Sweden)•Bedokclassminehunters(Singapore)•Sugashimaclassminehunters(Japan)•Type331minehunters(Germany)•Huonclassminehunters(Australia)•Seguraclassminehunters(Spain)•LatYaclassminehunters(Thailand)•Mahamiruclassminehunters(Malaysia)•KUHAclassminehunters(Finland)•Swallowclassminehunters(Korea)•Alanyaclassminehunters(Turkey)•Katanpääclassminehunters(Finland)•KormoranIIminehunter(Poland)

Submarines•Walrusclasssubmarines(Netherlands)•Trafalgarclasssubmarines(UK)•Vanguardclasssubmarines(UK)•Astuteclasssubmarines(UK)•Type209submarines(Chile,Argentina)•Type212submarines(Germany,Italy)•Type214submarines(Greece,Korea)•Victoriaclasssubmarines(Canada)•Seadragonclasssubmarines(Taiwan)•Sauroclasssubmarines(Italy)•Scorpènesubmarines(Chile&Malaysia)•Barracudaclasssubmarines(France)•S80submarines(Spain)•Jangbogosubmarines(Korea)•A26submarines(Sweden)•Dreadnoughtclasssubmarines(UK)

Naval motorsDuetotheirprovenreliabilityCombimacequipmentisinuseforthefollowingapplicationsonnavalships.

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Reference list

Quality Assurance and ControlAtCombimac,weoperatestrictlyinaccordancewiththeprocedureslaiddowninourqualitymanual.Thisensuresthatweachieveconstantandguaranteedhighqualitylevelsinourproducts,whicharealsoextensivelytestedinourcomputerizedlaboratory.Thecompletelogisticswithinthefactoryarecomputersupported,providinganefficientproductionflowandanoptimiseduseofexistinglabourandmachiningcapacities.Themajorityofthetestingandmeasuringequipmentisfullycomputercontrolled,therebyprovidingeasilyaccessibletestdata.Allthesefactorscontributetowardsfullproducttraceabilityatcompetitivepricesandadvantageousdeliverytimes.

KapiteinGrantstraat5-7821APEmmenP.O.Box2038-7801CAEmmen-TheNetherlands

Tel.+31(0)591-611531-Fax+31(0)591-619730E-mail:combimac@combimac.com

www.combimac.nl