预览加载中，请您耐心等待几秒...

highspeednotes.pdf

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

vaconacdrivesforhighspeedapplications Overview Highspeedmotorsareusedinmanyapplicationssuchas turboblowers,chillers,compressors,micro-turbinegas generators,machinetools,materialcutting,down-holeoil- pumpsetc.Benefitsofhighspeedmotordrivesare,for example,thereducedsizeandtheincreasedefficiency.High speedmotorsarenowadaysmainlypermanentmagnet synchronousmotorsorinductionmotors,whichbothcanbe controlledbyVaconfrequencyconverters.Permanent magnetmotorsarecomingmoreandmorepopulardueto thegoodpowerfactorandefficiency. Atveryhighspeeds,theuseofclosedloopcontrolwith externalspeedsensors(encoders)isdifficult,forexample, duetotherotationalspeedlimitsofspeedsensorsandthe reliablemechanicalmountingoftheencodertothemotorReferencecases;motorspeedvs.power shaft.Duetothis,Vaconusesopenloopcontrolinmostof thehighspeedapplicationsinordertoincreasethedrive trainreliability.MotorscanberunuptothethousandsofHz, themainlimitingfactorbeingusuallythemaximum switchingfrequencywhichthedriveinvertercanthermally withstand.Thesameopenloopcontrolcanbeeffectively usedalsowithdifferenttypeofoutputfilterssuchasdu/dt- filtersorsin-filters,ifthosearerequiredbythemotor manufacturer. ApplicationHighspeedmicroturbinegenerators xTheVaconHighSpeedApplicationhasbeendesignedfor processesthatrequirehigherspeedsthan320Hz,allowed bygeneralVaconapplications.Thereare2differentlevels ofthisapplication(ASFIFF12).Thefirstlevelcanrunupto 1900Hzandwiththesecondlevelitispossibletorunthe motorupto7200Hz.Theseapplicationsarebasedonthe VaconStandardApplicationandcanbeusedinbothNXS andNXPdrives. xTheapplicationhasa“highspeed”parametersubgroup, whereitispossibletofinetunethemotorcontrollerfor smootherrun xForslowacceleration/deceleration,LongRamptimes(1- 30000s)canbeactivatedbyaparameter.Defaultis0.1-Highspeedblowers 3000s. xForthefieldbus,itispossibletoprogramseparatelythe contentofProcessDataOuputs1to8.Thisisdonein parametergroup10. Highspeedcompressors VaconPlc Runsorintie7,65380Vaasa,Finland applic