IEC60034-30-1

IEC60034-30-1:201-403(e-nfr)

Edition1.0 2014-03

INTERNATIONAL

STANDARD

NORMEINTERNATIONALE

Rotatingelectricalmachines—

Part30-1:EfficiencyclassesoflineoperatedACmotors(IEcode)

Machinesélectriquestournantes-

Partie30-1:Classesderendementpourlesmoteursàcourantalternatifalimentésparleréseau(codeIE)

INTERNATIONAL

STANDARD

NORMEINTERNATIONALE

IEC60034-30-1

Edition1.0 2014-03

Rotatingelectricalmachines—

Part30-1:EfficiencyclassesoflineoperatedACmotors(IEcode)

Machinesélectriquestournantes—

Partie30-1:Classesderendementpourlesmoteursàcourantalternatifalimentésparleréseau(codeIE)

INTERNATIONALELECTROTECHNICALCOMMISSION

COMMISSIONELECTROTECHNIQUEINTERNATIONALE

ICS29.160

PRICECODECODEPRIX

T

ISBN978-2-8322-1415-2

Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor.

Attention!Veuillezvousassurerquevousavezobtenucettepublicationviaundistributeuragréé.

%RegisteredtrademarkoftheInternationalElectrotechnicalCommissionMarquedéposéedelaCommissionElectrotechniqueInternationale

-2-

IEC60034-30-1:2014

IEC2014

IEC60034-30-1:20140IEC2014

—11—

CONTENTS

FOREWORD. 3

INTRODUCTION 5

Scope 7

Normativereferences 8

Terms,definitionsandsymbols 9

Termsanddefinitions. 9

Symbols. 9

Fieldsofapplication 10

Efficiency. 11

Determination 11

General 11

Ratedvoltages,ratedfrequenciesandratedpower 11

Auxiliarydevices. 12

Rating 12

Classificationandmarking 13

General 13

Efficiencyclassification. 13

MotorsbelowIE1efficiency 13

Marking 13

NominallimitsforefficiencyclassesIE1,IE2,IE3andIE4 13

NominalefficiencylimitsforIE1 14

NominalefficiencylimitsforIE2 16

NominalefficiencylimitsforIE3 18

NominalefficiencylimitsforIE4 20

Interpolationofnominalefficiencylimitsofintermediaterated

powersfor50Hzmainssupplyfrequency 21

Interpolationofnominalefficiencylimitsofintermediaterated

powersfor60Hzmainssupplyfrequency 23

AnnexA(informative)NominallimitsforefficiencyclassIE5 24

Bibliography. 25

Table1—Motortechnologiesandtheirenergy-efficiencypotential 10

Table2—IE-Efficiencyclassification 13

Table3—Nominalefficiencylimits(%)for50HzIE1 14

Table4—Nominalefficiencylimits(%)for60HzIE1 15

Table5—Nominalefficiencylimits(%)for50HzIE2 16

Table6—Nominalefficiencylimits(%)for60HzIE2 17

Table7—Nominalefficiencylimits(%)for50HzIE3 18

Table8—Nominalefficiencylimits(%)for60HzIE3 19

Table9—Nominalefficiencylimits(%)for50HzIE4 20

Table10—Nominalefficiencylimits(%)for60HzIE4 21

Table11—Interpolationcoefficientsfor0,12kWupto0,74kW 22

Table12—Interpolationcoefficientsfor0,75kWupto200kW 22

INTERNATIONALELECTROTECHNICALCOMMISSION

ROTATINGELECTRICALMACHINES—

Part30-1:EfficiencyclassesoflineoperatedACmotors(IEcode)

FOREWORD

TheInternationalElectrotechnicalCommission(IEC)isaworldwideorganizationforstandardizationcomprisingallnationalelectrotechnicalcommittees(IECNationalCommittees).TheobjectofIECistopromoteinternationalco-operationonallquestionsconcerningstandardizationintheelectricalandelectronicfields.Tothisendandinadditiontootheractivities,IECpublishesInternationalStandards,TechnicalSpecifications,TechnicalReports,PubliclyAvailableSpecifications(PAS)andGuides(hereafterreferredtoas“IECPublication(s)”).Theirpreparationisentrustedtotechnicalcommittees;anyIECNationalCommitteeinterestedinthesubjectdealtwithmayparticipateinthispreparatorywork.International,governmentalandnon-governmentalorganizationsliaisingwiththeIECalsoparticipateinthispreparation.IECcollaboratescloselywiththeInternationalOrganizationforStandardization(ISO)inaccordancewithconditionsdeterminedbyagreementbetweenthetwoorganizations.

TheformaldecisionsoragreementsofIEContechnicalmattersexpress,asnearlyaspossible,aninternationalconsensusofopinionontherelevantsubjectssinceeachtechnicalcommitteehasrepresentationfromallinterestedIECNationalCommittees.

IECPublicationshavetheformofrecommendationsforinternationaluseandareacceptedbyIECNationalCommitteesinthatsense.WhileallreasonableeffortsaremadetoensurethatthetechnicalcontentofIECPublicationsisaccurate,IECcannotbeheldresponsibleforthewayinwhichtheyareusedorforanymisinterpretationbyanyenduser.

Inordertopromoteinternationaluniformity,IECNationalCommitteesundertaketoapplyIECPublicationstransparentlytothemaximumextentpossibleintheirnationalandregionalpublications.AnydivergencebetweenanyIECPublicationandthecorrespondingnationalorregionalpublicationshallbeclearlyindicatedintheIatter.

IECitselfdoesnotprovideanyattestationofconformity.Independentcertificationbodiesprovideconformityassessmentservicesand,insomeareas,accesstoIECmarksofconformity.IECisnotresponsibleforanyservicescarriedoutbyindependentcertificationbodies.

AllusersshouldensurethattheyhavetheIatesteditionofthispublication.

NoliabilityshallattachtoIECoritsdirectors,employees,servantsoragentsincludingindividualexpertsandmembersofitstechnicalcommitteesandIECNationalCommitteesforanypersonalinjury,propertydamageorotherdamageofanynaturewhatsoever,whetherdirectorindirect,orforcosts(includinglegalfees)andexpensesarisingoutofthepublication,useof,orrelianceupon,thisIECPublicationoranyotherIECPublications.

AttentionisdrawntotheNormativereferencescitedinthispublication.Useofthereferencedpublicationsisindispensableforthecorrectapplicationofthispublication.

AttentionisdrawntothepossibilitythatsomeoftheelementsofthisIECPublicationmaybethesubjectofpatentrights.IECshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

InternationalStandardIEC60034-30-1hasbeenpreparedbyIECtechnicalcommittee2:Rotatingmachinery.

ThisfirsteditionofIEC60034-30-1cancelsandreplacesIEC60034-30(2008).ItalsocancelsandreplacesAnnexAofIEC60034-31(2010).InthenextrevisionofIEC60034-31:2010thisannexwillberemovedfromitscontents.

Thetextofthisstandardisbasedonthefollowingdocuments:

FDIS

Reportonvoting

2/1729/FDIS

2/1739/RVD

Fullinformationonthevotingfortheapprovalofthisstandardcanbefoundinthereportonvotingindicatedintheabovetable.

—

PAGE

8

—

IEC60034-30-1:2014

IEC2014

IEC60034-30-1:20140IEC2014

—

PAGE

9

—

ThispublicationhasbeendraftedinaccordancewiththeISO/IECDirectives,Part2.

NOTEAtableofcross-referencesofallIECTC2publicationscanbefoundontheIECTC2dashboardontheIECwebsite.

ThecommitteehasdecidedthatthecontentsofthispublicationwillremainunchangeduntilthestabilitydateindicatedontheIECwebsiteunder

"http://webstore.iec.ch"

inthedatarelatedtothespecificpublication.Atthisdate,thepublicationwillbe

reconfirmed,

withdrawn,

replacedbyarevisededition,or

amended.

INTRODUCTION

ThisIECstandardprovidesfortheglobalharmonizationofenergy-efficiencyclassesofelectricmotors.Itdealswithallkindsofelectricmotorsthatareratedforlineoperation(includingstartingatreducedvoltage).Thisincludesallsingle-andthree-phaselowvoltageinductionmotors,regardlessoftheirratedvoltageandfrequency,aswellasline-startpermanent-magnetmotors.

Asecondpartofthisstandardseries(IEC60034-30-2)willbepreparedformotorsratedforvariablevoltageandfrequencysupply,suchassynchronousmotors.Thesecondpartwillalsoprovideforharmonicvoltagelossesinmotorscapableoflineoperationwhenfedbyfrequencyconverters.

IEC60034-30-1widenstheproductrangecoveredinthefirsteditionofIEC60034-30significantly.Thepowerrangehasbeenexpanded(startingat0,12kWandendingat1000kW).Alltechnicalconstructionsofelectricmotorsarecoveredaslongastheyareratedforon-lineoperationandnotjustthree-phase,cage-inductionmotorsasinthefirstedition.

TheIE4classisnewlyincludedinthisstandard.TheinformativedefinitionofIE4,whichwas

previouslyincludedinIEC/TS60034-31:2010,isthereforeoutdated.

ThenewclassIE5isnotyetdefinedindetailbutisenvisagedforpotentialproductsinafutureeditionofthestandard.

Foragivenpowerandframesizeitisgenerallyeasiertoachieveahighermotorefficiencywhenthemotorisdesignedforandoperateddirectlyon-linewitha60Hzsupplyfrequencyratherthanon50HzasexplainedinNote1.

NOTE1Astheutilizationandsizeofmotorsarerelatedtotorqueratherthanpowerthetheoreticalpowerofsingle-speedmotorsincreaseslinearlywithsupplyfrequency(andhencewithspeed),i.e.by20%from50Hzto60Hz.

I2Rwinding-lossesaredominantespeciallyinsmallandmediumsizedinductionmotors.Theybasicallyremainconstantat50Hzand60Hzaslongasthetorqueiskeptconstant.Althoughwindage,frictionandironlossesincreasewithfrequency,theyplayaminorroleespeciallyinmotorswithanumberofpolesoffourandhigher.Therefore,at60Hz,thelossesincreaselessthanthe20%powerincreasewhencomparedto50Hzandconsequently,theefficiencyisimproved.

Inpractice,both60Hzand50Hzpowerdesignationsofsingle-speedmotorshavetoconformtostandardpowerlevelsinaccordancewithIEC60072-1andlocalstandardssuchasEN50347.Therefore,anincreasedratingofmotorpowerby20%isnotalwayspossible.Howeverthegeneraladvantageof60Hzstillapplieswhenthemotordesignisoptimizedfortherespectivesupplyfrequencyratherthanjustre-rated.

Thedifferenceinefficiencybetween50Hzand60Hzvarieswiththenumberofpolesandthesizeofthemotor.Ingeneral,the60Hzefficiencyofthree-phase,cage-inductionmotorsinthepowerrangefrom0,75kWupto375kWisbetween2,5percentagepointstolessthan0,5percentagepointsgreaterwhencomparedtothe50Hzefficiency.Onlylarge2-polemotorsmayexperienceareducedefficiencyat60Hzduetotheirhighshareofiron,windageandfrictionlosses.

Itisnotexpectedthatallmanufacturerswillproducemotorsforallefficiencyclassesnorallratingsofagivenclass.

Usersshouldselecttheefficiencyclassinaccordancewithagivenapplicationdependingontheactualoperatinghours.Itmaynotbeenergyefficienttoselectmotorsofahighefficiencyclassforintermittentorshorttimedutyduetoincreasedinertiaandstart-uplosses.

NOTE2TheapplicationguideIEC/TS60034-31:2010givesfurtherinformationonusefulapplicationsofhigh-efficientelectricmotors.

Inordertoachieveasignificantmarketshareitisessentialforhigh-efficiencymotorstomeetnational/regionalstandardsforassignedpowersinrelationtomechanicaldimensions(suchasframe-size,flanges).Thereareanumberofnational/regionalframeassignmentstandards(EN50347,JISC4212,NBR17094,NEMAMG13,SANS1804andothers)butthereisno

IECstandard.Asthisstandard(IEC60034-30-1)definesenergy-efficiencyclassesindependentofdimensionalconstraintsitmaynotbepossibleinallmarketstoproducemotorswithhigherefficiencyclassesandmaintainthemechanicaldimensionsofthenational/regionalstandards.

IEcodesarenotlimitedtomotorsbutmaybeusedtoclassifyothercomponentssuchasfrequencyconvertersandgearboxes.

However,itisanticipatedthatothercomponentsareratedwithacomparablesystem:IE1meaninglowefficiencyuptoIE5meaningthehighestefficiency.

Combinationsofcomponents(suchaspowerdrivesystems)willneedacombinedefficiencyrating.ThatratingshouldnotbeanIEcodeinordertoavoidconfusion.ItwillbedefinedinotherIECstandards.

Theefficiencylevelsinthisstandardfor50Hzand60Hzarenotalwaysentirelyconsistentacrossallnumbersofpolesandoverthewholepowerrange.

NOTE3Theefficiencylevelsfor60HzmotorswereassignedforcompatibilitywithU.S.legalrequirements.

NOTE4TheefficiencyIevelsfor50Hzmotorsbetween0,75kWand375kWremainunchangedforcompatibilitywithEuropeanlegalrequirements.

ROTATINGELECTRICALMACHINES—

Part30-1:EfficiencyclassesoflineoperatedACmotors(IEcode)

Scope

ThispartofIEC60034specifiesefficiencyclassesforsingle-speedelectricmotorsthatareratedaccordingtoIEC60034-1orIEC60079-0,areratedforoperationonasinusoidalvoltagesupplyand:

havearatedpowerPNfrom0,12kWto1000kW;

havearatedvoltageINabove50Vupto1kV;

have2,4,6or8poles;

arecapableofcontinuousoperationattheirratedpowerwithatemperaturerisewithinthespecifiedinsulationtemperatureclass;

NOTE1MostmotorscoveredbythisstandardareratedfordutytypeS1(continuousduty).However,somemotorsthatareratedforotherdutycyclesarestillcapableofcontinuousoperationattheirratedpowerandthesemotorsarealsocovered.

aremarkedwithanyambienttemperaturewithintherangeof—20°Cto+60°C;

NOTE2Theratedefficiencyandefficiencyclassesarebasedon25°CambienttemperatureaccordingtoIEC60034-2-1.

NOTE3Motorsratedfortemperaturesoutsidetherange—20°Cand+60°Careconsideredtobeofspecialconstructionandareconsequentlyexcludedfromthisstandard.

NOTE4Smokeextractionmotorswithatemperatureclassofuptoandincluding400°Carecoveredbythisstandard.

aremarkedwithanaltitudeupto4000mabovesealevel.

NOTE5Theratedefficiencyandefficiencyclassarebasedonaratingforaltitudesupto1000mabovesealevel.

Thisstandardestablishesasetoflimitefficiencyvaluesbasedonfrequency,numberofpolesandmotorpower.Nodistinctionismadebetweenmotortechnologies,supplyvoltageormotorswithincreasedinsulationdesignedspecificallyforconverteroperationeventhoughthesemotortechnologiesmaynotallbecapableofreachingthehigherefficiencyclasses(seeTable1).Thismakesdifferentmotortechnologiesfullycomparablewithrespecttotheirenergyefficiencypotential.

NOTE6Regulatorsshouldconsidertheaboveconstraintswhenassigningnationalminimumenergy-efficiencyperformancestandards(MEPS)withrespecttoanyparticulartypeofmotor.

Theefficiencyofpower-drivesystemsisnotcoveredbythisstandard.Inparticular,motorlossesduetoharmoniccontentofthesupplyvoltage,lossesincables,filtersandfrequency-converters,arenotcovered.

Motorswithflanges,feetand/orshaftswithmechanicaldimensionsdifferentfromIEC60072-1arecoveredbythisstandard.

Gearedmotorsarecoveredbythisstandardincludingthoseincorporatingnon-standardshaftsandflanges.

Excludedare:

Single-speedmotorswith10ormorepolesormulti-speedmotors.

Motorswithmechanicalcommutators(suchasDCmotors).

Motorscompletelyintegratedintoamachine(forexamplepump,fanandcompressor)thatcannotbepracticallytestedseparatelyfromthemachineevenwithprovisionofatemporaryend-shieldanddrive-endbearing.Thismeansthemotorshall:a)sharecommoncomponents(apartfromconnectorssuchasbolts)withthedrivenunit(forexample,ashaftorhousing)and;b)notbedesignedinsuchawayastoenablethemotortobeseparatedfromthedrivenunitasanentiremotorthatcanoperateindependentlyofthedrivenunit.Thatis,foramotortobeexcludedfromthisstandard,theprocessofseparationshallrenderthemotorinoperative.

(TEAO,IC418)Totallyenclosedair-overmachines,i.e.totallyenclosedframe-surfacecooledmachinesintendedforexteriorcoolingbyaventilatingmeansexternaltothemachine,arecoveredbythisstandard.Efficiencytestingofsuchmotorsmaybeperformedwiththefanremovedandthecoolingprovidedbyanexternalblowerwithasimilarairflowrateastheoriginalfan.

Motorswithintegratedfrequency-converters(compactdrives)whenthemotorcannotbetestedseparatelyfromtheconverter.Energyefficiencyclassificationofcompactdrivesshallbebasedonthecompleteproduct(PDS:PowerDriveSystem)andwillbedefinedinaseparatestandard.

NOTE7Amotorisnotexcludedwhenthemotorandfrequency-convertercanbeseparatedandthemotorcanbetestedindependentlyoftheconverter.

Brakemotorswhenthebrakeisanintegralpartoftheinnermotorconstructionandcanneitherberemovednorsuppliedbyaseparatepowersourceduringthetestingofmotorefficiency.

NOTE8Brakemotorswithabrakecoilthatisintegratedintotheflangeofthemotorarecoveredaslongasitispossibletotestmotorefficiencywithoutthelossesofthebrake(forexamplebydismantlingthebrakeorbyenergizingthebrakecoilfromaseparatepowersource).

Whenthemanufactureroffersamotorofthesamedesignwithandwithoutabrakethetestofmotorefficiencymaybedoneonamotorwithoutthebrake.Thedeterminedefficiencymaythenbeusedastheratingofbothmotorandbrakemotor.

Submersiblemotorsspecificallydesignedtooperatewhollyimmersedinaliquid.

Smokeextractionmotorswithatemperatureclassabove400°C.

Normativereferences

Thefollowingdocuments,inwholeorinpart,arenormativelyreferencedinthisdocumentandareindispensableforitsapplication.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

IEC60034-1,Rotatingelectricalmachines—Part1:Ratingandperformance

IEC60034-2-1,Rotatingelectricalmachines—Part2-1:Standardmethodsfordetermininglossesandefficiencyfromtests(excludingmachinesfortractionvehicles)

IEC/TS60034-2-3,Rotatingelectricalmachines—Part2-3:Specifictestmethodsfordetermininglossesandefficiencyofconverter-fedACinductionmotors

IEC60034-6,Rotatingelectricalmachines—Part6:Methodsofcooling(ICCode)

IEC/TS60034-25,Rotatingelectricalmachines—Part25:Guidanceforthedesignandperformanceofa.c.motorsspecificallydesignedforconvertersupply

IEC60038,IECstandardvoltages

IEC60079-0,Explosiveatmospheres—Part0:Equipment—Generalrequirements

Terms,definitionsandsymbols

Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninIEC60034-1andthefollowingapply.

3.1.1

singie-speedmotor

motorratedfor50Hzand/or60Hzon-lineoperation

Note1toentry:Single-speedmotorsmaybecapabieoffrequencyconverteroperationwithvariabiespeed.

3.1.2

multi-speedmotor

motorratedfor50Hzand/or60Hzon-lineoperationthathasmultiplewindingsoraswitchablewindingtoprovidetwoormoredifferentnumberofpoleswithdifferentsynchronousspeeds

3.1.3

variablespeedmotor

motorratedforaspeedrangeandsuppliedbyvoltageofvariableamplitudeandfrequency

3.1.4

brakemotor

motorequippedwithanelectro-mechanicalbrakeunitoperatingdirectlyonthemotorshaftwithoutcouplings

3.1.5

gearedmotor

motorequippedwithanintegralgearboxwithoutcouplings(i.e.thefirstgearwheelisfixedtothemotorshaft)

3.1.6

pumpmotor

motordirectlyattachedtoapumpwithoutcouplings(i.e.theimpellerisfixedtothemotorshaft)

3.1.7

averageefficiency

averageefficiencyvalueforamotorpopulationofthesamedesignandrating

3.1.8

nominalefficiency

efficiencyvaluerequiredtomeetacertainefficiencyclassaccordingtotheefficiencytablesinthisstandard

3.1.9

ratedefficiency

efficiencyvalueassignedbythemanufacturer,equaltothenominalefficiencyvalueorhigher

Symbols

qn isthenominalefficiency,%qN istheratedefficiency,%

—

PAGE

18

—

IEC60034-30-1:20140IEC2014

IEC60034-30-1:20140IEC2014

—

PAGE

19

—

fN istheratedfrequency,HzN istheratedspeed,min—1PNistheratedpower,kW

INistheratedtorque,NmINistheratedvoltage,V

Fieldsofapplication

Table1givesinformationonline-startandenergy-efficiencypotentialofvariouscommonlyusedmotortechnologies.

Notallmotortechnologiesareabletoreachallefficiencyclassesnorcanmotorsforallefficiencyclassesorsizesbeproducedoroperatedinaneconomicallyfeasibleway.Therefore,regulatorsareaskedtoconsiderthefollowingconstraintswhenassigningminimumenergyefficiencyperformancestandards(MEPS).

Motorsmarkedwith“Yes”inTable1areconsideredtobestateofpresenttechnologyandareconsequentlysuitableforconsiderationinmandatoryrequirementsinlegislation.

Table1—MotortechnotogiesandtheirenergyefficiencypotentiaI

Motortype

IE1

IE2

IE3

IE4

IE5

Three-phasecage-rotorinductionmotors(ASM)

Randomwoundwindings(allenclosures,allratings)

Yes

Yes

Yes

Difficult

No

Formwoundwindings;IP2x(openmotors)

Yes

Yes

Difficult

No

No

Formwoundwindings;IP4xandabove

Yes

Yes

Yes

Difficult

No

Three-phasewound-ro

torinductionmotors

Yes

Yes

Yes

Difficult

No

Single-phaseinductionmotors

Startcapacitor

Difficult

No

No

No

No

Runcapacitor

Yes

Difficult

No

No

No

Start/runcapacitor

Yes

Difficult

No

No

No

Split-phase

Difficult

No

No

No

No

Synchronousmotors

Line-startpermanent-magnet(LSPMd)

Yes

Yes

Yes

Difficult

No

Line-startpermanent-magnetmotorshavelimitationsontheirline-startcapabilitieswithrespecttotorqueandexternalinertiaandmaynotbesuitableforalltypesofapplications.

NOTE1WithregardtotheIElevels,“Yes”meanstheefficiencyclassisachievablewithpresenttechnology(althoughinsomecasesitmaynotbeeconomical);“No”meanstheefficiencyclassisnotgenerallyachievablewithpresenttechnology;“Difficult”meansthattheenergy-efficiencylevelmaybeachievedwithpresenttechnologyforsomebutnotallpowerratingsandthestandardizedframe-sizemaybeexceeded.“Line-start”meansthecapabilityofthemotortostartdirecton-line(DesignNofIEC60034-12forsingle-speed,three-phasecageinductionmotors)withouttheneedforafrequencyconverter.

NOTE2ItmaybedifficulttodevelopmotorsforefficiencyclassesIE3andabovewithinthelocalpower/framesizestandards(suchasNBR17094orEN50347).

NOTE3ItisexpectedthatmotorsforefficiencyclassIE5willbecoveredinpart2ofthisstandard.

NOTE4TheenergyefficiencypotentialofmotortechnologiesregardingIE5classificationwillberevisedaftertheIE5classificationhasbeendefined.

Motorscoveredbythisstandardmaybeusedinvariable-speeddriveapplications(seeIEC/TS60034-25).Insuchapplicationstheactualefficiencyofthemotorislowerthantheratedefficiencyduetoincreasedlossesfromtheharmonic-voltagecontentofthepowersupply.ForefficiencytestingseeIEC/TS60034-2-3.

Theenergyefficiencyclassificationofmotorsinthisstandardisrelatedtothelossesatsinusoidalpowersupplyonly.

Thefollowingmotorsmaynotbeabletoreachthehigherefficiencyclassesspecifications(IE3andabove):

MotorswithcoolingmethodsotherthanIC0Ax,IC1Ax,IC2Ax,IC3AxorIC4Ax(seeIEC60034-6);

Motorsbuiltforarestrictedspace(high-outputdesign,i.e.smallerframesizesthanusualinnationalstandards);

MotorsspecificallybuiltforoperationinexplosiveenvironmentsaccordingtoIEC60079-0(duetosafetyrequirementsandpossibledesignconstraintsofexplosionproofmotorssuchasincreasedair-gap,reducedstartingcurrent,enhancedsealing);

MotorsforspecialrequirementsofthedrivenmachinebeyondtherequirementsoftheIEC60034seriesofstandards(suchasmotorsforheavystartingduty,specialtorquestiffnessand/orbreakdowntorquecharacteristics,largenumberofstart/stopcycles,verylowrotorinertia);

MotorsforspecialcharacteristicsofthegridsupplybeyondtherequirementsoftheIEC60034seriesofstandards(suchasmotorswithlimitedstartingcurrent,increasedtolerancesofvoltageand/orfrequency);

Motorswithliquidcoolingonaccountoftheirhigherpowerdensitycomparedwithaircooledmotorsofthesameframesize;

Smokeextractionmotorswithatemperatureclasshigherthan300°C.

Efficiency

Determination

General

Thisstandarddealswithsingle-speedmotorsoperatedon-line.Motorsoperatedbyfrequency-convertersmayhavehigherlossesascomparedtoon-line(sinusoidal)powersupplyduetotheharmonicvoltagecontent(fordetailsseeIEC/TS60034-25).Theyarecoveredinparttwoofthisstandardseries.

Inordertomakeefficiencyclassratingscomparablebetweendifferentmotortechnologies,alltestsaccordingtothisstandardshallbeperformedonsinusoidalvoltage.

EfficiencyandlossesshallbetestedinaccordancewiththepreferredmethodoftheindividualmotortypeasgiveninIEC60034-2-1.

Ratedvoltages,ratedfrequenciesandratedpower

TheratedefficiencyshallbedeterminedatratedpowerPN,ratedvoltageINandratedfrequency,/N.

Motorsratedforanextendedvoltagetolerance(forexample400V+10%accordingtoIEC60038)shallbeassignedasingleratedefficiency,i.e.theextendedtoleranceshallbedisregarded.

Motorswithratedvoltage/frequencycombinationsofthesamemagneticfluxandpower,forexample230V/400V(delta/star)or230V/460V(double-star/star),shallhaveonlyoneratedefficiencyandefficiencyclass(IEcode).

Motorswithmorethanoneratedvoltage/frequency/powercombinationshouldbeassignedaratedefficiencyandaratedefficiency-class(IEcode)foreachratedvoltage/frequency/powercombination.

However,asaminimumthelowestefficiencyvalueandtheassociatedIEcode(ofallratedvoltage/frequency/powercombinations)shallalwaysbeprintedontheratingplate.

AllefficiencyvaluesandIEcodesshallbeavailableintheproductdocumentation(catalogueoroperatinginstructions).

NOTEForexampleinJapantheratingcombination“200V/50Hz—200V/60Hz—220V/60Hz”iscommonlyusedforsingle-speedmotorsandinEuropetheratingcombination“380V/50Hz—400V/50Hz—415V/50Hz—460V/60Hz”issometimesused.FortheseexamplestherewillbethreeorfourefficiencyratingsandtheremaybeseveraldifferentIEcodes.

Auxiliarydevices

Someelectricmotorscoveredbythisstandardmaybeequippedwithauxiliarydevicessuchasshaftseals,externalfans,mechanicalbrakes,back-stopsandunidirectionalbearings,speedsensors,tacho-generatorsinvar