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1、312IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.55,NO.1,JANUARY2008InductionMotorDrivesEquippedWithDiodeRectifierandSmallDC-LinkCapacitanceMarkoHinkkanen,Member,IEEE,andJormaLuomi,Member,IEEEAbstractThispaperdealswithsensorlessvector-controlledInthispaper,thedimensio
2、ningofthedclinkisbasedoninductionmotordrivesthatarefedbyafrequencyconverteranaturalfrequencythatishigherthansixtimesthemainsthatisequippedwithadiodefront-endrectifier.Asmalldc-linkfrequencybutlowerthantheswitchingfrequency.Inpractice,capacitanceisused,whichmakesitpo
3、ssibletoreplacetheelec-themainsinductanceissufficient,andnoadditionalchokeistrolyticcapacitorswithfilmcapacitors.Thenaturalfrequencyofthedclinkischosentobeconsiderablyhigherthansixtimestheneeded.Thevectorcontrolwithrotorfluxorientationisused.mainsfrequencybutlowerthan
4、theswitchingfrequency.Are-Theeffectsofthesmalldc-linkcapacitanceonthecontrolcentlyproposedsensorlesscontrollercanbeexploited;onlyminorsystemdesignandcontrolperformancearestudied.Theripplemodificationsforsmallcapacitancesareneeded.Thesimulationinthedc-linkvoltage,par
5、ticularly,atsixtimesthemainsandexperimentalresultsofa2.2-kWdrivethatisequippedwithafrequency,isconsiderablyhigherthanusual.Atlowspeeds,capacitanceofonly24µFdemonstrateoperationinawidespeedrange.thisrippledoesnotdeterioratetheperformancesincethedutycyclesofthepulsew
6、idthmodulatorarecalculatedbasedonIndexTermsControl,dclink,filmcapacitors,sensorless.themeasureddc-linkvoltage.Athighspeeds,thefluxleveliscontrolledbasedonthepulsatingdc-linkvoltageinorderI.INTRODUCTIONtomaximizethetorque[6],[7].Toavoidabrakingresistor,thebrakingschem
7、ethatwasproposedin[7]isexploited.REQUENCYconvertersthatareusedininductionmotorFurthermore,restrictionsonthedynamicsmaybeneededtoFdrivesareusuallyequippedwithacost-effectivesix-pulsepreventanovervoltageinthedclink,exceptinthecaseoflow-dioderectifier,avoltage-stiffdcl
8、ink,andapulsewidth-powerdrives.modulated(PWM)inverter.Conventionally,thedclinkconsistsofelectrolyticcapacitorsandadcchoke(oranacchokeattheinputof
