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1、ThefrequencyconverterisusedanddiscussedlightlyTheasynchronousmotorissuchmainpowerequipmentofmanufacturingenterpriseaselectricity,chemicalindustry5etc..Asthehighenergyconsumptionequipment,itsoutputpowercan'tbeuptothechangeprorataofload,majoritycanonlyturnonthrough
2、guardorvalvedegreeregulate,buttheenergythatthemotorconsumesdoesnotchangemuch,thuscauseverygreatenergytoloss.Inrecentyears,onethatiswiththematurityoftheproductiontechnologyofthefrequencyconverterandrangeofapplicationoffrequencyconverterisextensivedaybyday,usethefr
3、equencyconvertertocarryontechnologytotransformtothemotorpowerintotheenergy-conserving，high-efficiencyimportantmeansofeveryenterprise.1・Frequencyconversionadjuststhespeedprinciplen=60f(1—s)/p(1)Inthetypen—Rotationalspeedoftheasynchronousmotor;f—Frequencyoftheasync
4、hronousmotor;s—Themotoristransferee!tothedifferencerate;p・—LogarithmverymuchofthemotoroCanknowbytype(1)rotationalspeednindirectproportiontofrequencyf,onlyneedchangefrequencyfandchangetherotationalspeedofthemotor,motivepowerfrequencyrealizethatspeedregulate.Thefre
5、quencyconverterismainlyadoptedandhandedfrank・handoverthesidewhenfrequencyfchangesintherangeof0-50Hz,therotationalspeedofthemotorregulatestherangeverywidely.Frequencyconversiontransferspeedpasspersonwhochangeselectricity,exchangefrequentlyworkerpowerchangethrought
6、herectifierintoadirectcurrentsourcefirstjust,thenchangethedirectcurrentsourceintothefrequency，exchangepowercontrollableinvoltageinordertosupplythemotorThefrequencyconverteronethereisgenerallyfromrectificationcircuit,inthemiddleofdirectcurrentlink,goagainstnotbeco
7、mingandcontrollingpartingof4piecesnottomakeup.Rectificationpartthree-phasebridgecontrolledrectifier,isitchangesomeintoIGBTthree-phasebridgetypegoagainstthengdevicetogoagainst,andoutputforPWMwaveform,middledirectcurrentforstrainwave,directcurrentenergystorageandbu
8、fferinactivepowerlink・ThewaveinharmonyissuppressedOutstandingproblemthatfrequencyconverterusewhetherinharmonywaveinterfere,asfrequencyconverterwhenworking,outp
