1、河南科技学院机电学院-1-ThefrequencyconverterisusedanddiscussedlightlyTheasynchronousmotorissuchmainpowerequipmentofmanufacturingenterpriseaselectricity/chemicalindustry/etc/Asthehighenergyconsumptionequipment/itsoutputpowercantbeuptothechangeprorataofload/majoritycanonlyturnonthroughguardorvalvedegreeregulate
2、/buttheenergythatthemotorconsumesdoesnotchangemuch/thuscauseverygreatenergytoloss/Inrecentyears/onethatiswiththematurityoftheproductiontechnologyofthefrequencyconverterandrangeofapplicationoffrequencyconverterisextensivedaybyday/usethefrequencyconvertertocarryontechnologytotransformtothemotorpowerin
3、totheenergy-conserving/high-efficiencyimportantmeansofeveryenterprise/1/Frequencyconversionadjuststhespeedprinciplen60f(1s)/p(1)Inthetypen-Rotationalspeedoftheasynchronousmotor；f-Frequencyoftheasynchronousmotor；s-Themotoristransferedtothedifferencerate；p-Logarithmverymuchofthemotor。Canknowbytype(1)r
4、otationalspeednindirectproportiontofrequencyf/onlyneedchangefrequencyfandchangetherotationalspeedofthemotor/motivepowerfrequencyrealizethatspeedregulate/Thefrequencyconverterismainlyadoptedandhandedin-frank-handoverthesidewhenfrequencyfchangesintherangeof0-50Hz/therotationalspeedofthemotorregulatest
5、herangeverywidely/Frequencyconversiontransferspeedpasspersonwhochangeselectricity/exchangefrequentlyworkerpowerchangethroughtherectifierintoadirectcurrentsourcefirstjust/thenchangethedirectcurrentsourceintothefrequency/exchangepowercontrollableinvoltageinordertosupplythemotor/Thefrequencyconverteron
6、ethereisgenerallyfromrectificationcircuit/河南科技学院机电学院-2-inthemiddleofdirectcurrentlink/goagainstnotbecomingandcontrollingpartingof4piecesnottomakeup/Rectificationpartthree-phasebridgecontrolledrectifier/isitchangesomeintoIGBTthree-phasebridgetypegoagainstthengdevicetogoagainst/andoutputforPWMwaveform
7、/middledirectcurrentforstrainwave/directcurrentenergystorageandbufferinactivepowerlink/ThewaveinharmonyissuppressedOutstandingproblemthatfrequencyconverterusewhetherinharmonywaveinterfere/asfrequencyconverterwhenworking/outputinharmonywaveelectriccurrentofelectriccurrentwillleadtothefactinterferingt
8、othepower/Thougheveryfrequencyconverterproducertakemeasuresandreachtofrequencyconverterinharmonyadministrationofwavenationalstandardrequirebasically/questionneedingtopaycloseattentiontomostinbutthewaveinharmonyremainstheselectingtypeofthefrequencyconverteranduses/Containotherwavesinharmonybesidesbas
9、ewaveinthevoltageofoutputofthefrequencyconverter/Lowtimesofinharmonywaveusuallyexertagreatinfluenceonelectricalmachineryload/causethetorquetopulse/andhigherwaveinharmonymakesthefrequencyconverterexportleakingtheelectriccurrenttoincreaseofthecableagain/makeelectricalmachineryexertoneselfinsufficient/
10、soleveltimesofinharmonywavethatfrequencyconverteroutputmustsuppress/Becausetherectificationpartofthefrequencyconverteradoptsthecontrolledbridgetyperectificationcircuitofdiode/themiddlestrainwavepartadoptlargeelectriccapacityaswavefilter/sointroductionofrectifierelectriccurrenttochargeelectriccurrent
11、condenserinfact/itisasteeperpulsewave/itswaveinharmonyisrelativelylargeinweight/Inordertodispelthewaveinharmony/adoptthefollowingcountermeasuremainly/a/Increasefrequencyconvertersupplypowerpowerimpedancegenerally/interiorimpedance/powerofequipmentcanisitbufferfrequencyconverterdirectcurrentstrainfun
12、ctionofinactivepower/waveofelectriccapacitytoplay/Impedanceisshortcircuitimpedanceofthevoltagetransformerinthiskind/Look河南科技学院机电学院-3-onpowercapacityrelativecapacitylittlefrequencyconverteras/interiorimpedancevaluerelativeandheavy/thelessthecontentofwaveinharmonyis；Therelativefrequencyconverterofcapa
13、cityofthepoweristhelargerincapacity/impedancevalueisrelativelow/thelargerthecontentofwaveinharmonyis/Choosefrequencyconverteratsupplyingpowerpowertransformering/hadbetterisitshortoutimpedanceheavyvoltagetransformertochoose/b/Installreactorinstallreactortoincreasefromoutsidefrequencyconvertersupplypo
14、werinteriorimpedanceofpoweractually/Installsthereactororinstallsatthesametimeontheexchangesideofthefrequencyconverterorthedirectcurrentsideofthefrequencyconverter/cansuppresstheelectriccurrentofwaveinharmony/c/Therectificationpartofthefrequencyconverteris6pulsewaverectifiersthatthevoltagetransformer
15、usuallyoperatesheterogeneously/sothewaveinharmonyproducedisrelativelybig/Useheterogeneousoperationofvoltagetransformer/suchasmakephaseplacecornerbadYof30eachotherY、2voltagetransformersmadeupareformedandequivalentto12pulsewaverectifiers/canreducetheelectriccurrentofwaveinharmony/playagoingtothewavein
16、harmonytosuppressrole/d/RegulateyearofthefrequencyconverterBobImproveBobinyearofthefrequencyconverter/cansuppresswaveinharmonyonceeffectivelylow/e/UsethewavefilterWavefiltercanmeasurefrequencyconverterinharmonywaveamplitudeandphaseplaceofelectriccurrent/producetheelectriccurrentcontrarytoelectriccur
17、rentphaseplacethesameinamplitudeofwaveinharmony/thusabsorbeffectively/3/Matchofload3/1SquaretorqueloadAirblower/pumploadwhetherindustryuseequipmentmostlive/frequencyconverteratmostapplicationattheload/Itplantssquaretorqueload/Generallyspeaking/haveU/f=Constcontrolfrequencyconverterofmodecanmeetthe河南
18、科技学院机电学院-4-demandofloadbasically/belowfoundationthemaincharacteristicquestionthatneednoticewhenintroducingpersonningwhoselectoffrequencyconverter/3/1/1HaveavoidedloadingAirblowerdifficultoverloadaswaterpump/guaranteeitgreaterthanormeanthecapacityofthemotorslightlyatthecapacitytochoosefrequencyconver
19、ter；Overloadcapacityoffrequencyconverterthatchooseatthesametimerequiretobelowereven/upto120%generally/1min/Butshouldnoticewhenthefunctionparameterofthefrequencyconverterischosenandpresetted/becausetheloadonehindersthetorqueindirectproportiontothesquareofrotationalspeed/whentheoperatingfrequencyishig
20、herthanthespecifiedfrequencyofthemotor/tohindertorquecanexceedthespecifiedtorqueload/overfreightmotor/Soisitcontrolsupremeoperatingfrequencycanexceedthespecifiedfrequencyoftheelectricalmachinerystrictlytowant/3/1/2Matchthatthefrequencyconverteracceleratestimeandmoderatestimewhileopening/stoppingBeca
21、useairblowerandloadofpumprotateinertiatobeheavy/itstartandwhenstoppingwithtoacceleratetimeandmoderatetimeitmatchestobeoneimportantproblemveryfrequencyconverter/Personwhoselectwhenusing/shouldcalculatetoacceleratetimeandmoderateaccordingtoloadparametertimechooseshorttimemostfrequencyconverterinfreque
22、ncyconverter/inordertotakeplacesituationthatvoltagetripwhenthefrequencyconverterhasnotflowedtotripwhilestartingandthefrequencyconverterismoderated/Butintheproductiontechnologysometimes/demandtobeverystricttothestart-uptimeofairblowerandpump/ifabove-mentionedtimethatcalculatecanatmeetingdemanding/shouldredesigntheselectingtypetothefrequencyconverter/3/1/3AvoidtheresonanceBecausefrequencyconverterthroughchangepowerfrequencyofmotorisitchangeelectricalmachineryrotationalspeedrealizeenergy-conservingresulttocome/possibleunderacertainelectricalmachineryrotationalspeedandloadsome
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