機(jī)械專業(yè)外文翻譯(中英文翻譯)

外文翻譯英文原文BeltConveyingSystemsDevelopmentofdrivingsystemAmongthemethodsofmaterialconveyingemployed，beltconveyorsplayaveryimportantpartinthereliablecarryingofmaterialoverlongdistancesatcompetitivecost．Conveyorsystemshavebecomelargerandmorecomplexanddrivesystemshavealsobeengoingthroughaprocessofevolutionandwillcontinuetodoso．Nowadays，biggerbeltsrequiremorepowerandhavebroughttheneedforlargerindividualdrivesaswellasmultipledrivessuchas3drivesof750kWforonebelt(thisisthecasefortheconveyordrivesinChengzhuangMine)．Theabilitytocontroldriveaccelerationtorqueiscriticaltobeltconveyors’performance．Anefficientdrivesystemshouldbeabletoprovidesmooth，softstartswhilemaintainingbelttensionswithinthespecifiedsafelimits．Forloadsharingonmultipledrives．torqueandspeedcontrolarealsoimportantconsiderationsinthedrivesystem’sdesign.Duetotheadvancesinconveyordrivecontroltechnology，atpresentmanymorereliable．Cost-effectiveandperformance-drivenconveyordrivesystemscoveringawiderangeofpowerareavailableforcustomers’choices[1].1Analysisonconveyordrivetechnologies1．1DirectdrivesFull-voltagestarters．Withafull-voltagestarterdesign，theconveyorheadshaftisdirect-coupledtothemotorthroughthegeardrive．Directfull-voltagestartersareadequateforrelativelylow-power,simple-profileconveyors．Withdirectfu11-voltagestarters．nocontrolisprovidedforvariousconveyorloadsand．dependingontheratiobetweenfu11-andno-1oadpowerrequirements，emptystartingtimescanbethreeorfourtimesfasterthanfullload．Themaintenance-freestartingsystemissimple，low-costandveryreliable．However,theycannotcontrolstartingtorqueandmaximumstalltorque；therefore．theyarelimitedtothelow-power,simple-profileconveyorbeltdrives．Reduced-voltagestarters．Asconveyorpowerrequirementsincrease，controllingtheappliedmotortorqueduringtheaccelerationperiodbecomesincreasinglyimportant．Becausemotortorque1safunctionofvoltage，motorvoltagemustbecontrolled．Thiscanbeachievedthroughreduced-voltagestartersbyemployingasiliconcontrolledrectifier(SCR)．AcommonstartingmethodwithSCRreduced-voltagestartersistoapplylowvoltageinitiallytotakeupconveyorbeltslack．a(chǎn)ndthentoapplyatimedlinearrampuptofullvoltageandbeltspeed．However,thisstartingmethodwillnotproduceconstantconveyorbeltacceleration．Whenaccelerationiscomplete．theSCRs,whichcontroltheappliedvoltagetotheelectricmotor．a(chǎn)relockedinfullconduction,providingfu11-linevoltagetothemotor．Motorswithhighertorqueandpull—uptorque，canprovidebetterstartingtorquewhencombinedwiththeSCRstarters,whichareavailableinsizesupto750KW．Woundrotorinductionmotors．WoundrotorinductionmotorsareconnecteddirectlytothedrivesystemreducerandareamodifiedconfigurationofastandardACinductionmotor．Byinsertingresistanceinserieswiththemotor’srotorwindings．themodifiedmotorcontrolsystemcontrolsmotortorque．Forconveyorstarting，resistanceisplacedinserieswiththerotorforlowinitialtorque．Astheconveyoraccelerates，theresistanceisreducedslowlytomaintainaconstantaccelerationtorque．Onmultiple-drivesystems．a(chǎn)nexternalslipresistormaybeleftinserieswiththerotorwindingstoaidinloadsharing．Themotorsystemshavearelativelysimpledesign．However,thecontrolsystemsforthesecanbehighlycomplex，becausetheyarebasedoncomputercontroloftheresistanceswitching．Today，themajorityofcontrolsystemsarecustomdesignedtomeetaconveyorsystem’sparticularspecifications．Woundrotormotorsareappropriateforsystemsrequiringmorethan400kW．DCmotor．DCmotors．a(chǎn)vailablefromafractionofthousandsofkW，aredesignedtodeliverconstanttorquebelowbasespeedandconstantkWabovebasespeedtothemaximumallowablerevolutionsperminute(r/min)．withthemajorityofconveyordrives,aDCshuntwoundmotorisused．Whereinthemotor’srotatingarmatureisconnectedexternally．ThemostcommontechnologyforcontrollingDCdrivesisaSCRdevice．whichallowsforcontinualvariable-speedoperation．TheDCdrivesystemismechanicallysimple,butcanincludecomplexcustom-designedelectronicstomonitorandcontrolthecompletesystem．Thissystemoptionisexpensiveincomparisontoothersoft-startsystems．butitisareliable,cost-effectivedriveinapplicationsinwhichtorque,1oadsharingandvariablespeedareprimaryconsiderations．DCmotorsgenerallyareusedwithhigher-powerconveyors，includingcomplexprofileconveyorswithmultiple-drivesystems，boostertrippersystemsneedingbelttensioncontrolandconveyorsrequiringawidevariable-speedrange．1．2HydrokineticcouplingHydrokineticcouplings，commonlyreferredtoasfluidcouplings．a(chǎn)recomposedofthreebasicelements;thedrivenimpeller,whichactsasacentrifugalpump；thedrivinghydraulicturbineknownastherunnerandacasingthatenclosesthetwopowercomponents．Hydraulicfluidispumpedfromthedrivenimpellertothedrivingrunner,producingtorqueatthedrivenshaft．Becausecirculatinghydraulicfluidproducesthetorqueandspeed，nomechanicalconnectionisrequiredbetweenthedrivinganddrivenshafts．Thepowerproducedbythiscouplingisbasedonthecirculatedfluid’samountanddensityandthetorqueinproportiontoinputspeed．Becausethepumpingactionwithinthefluidcouplingdependsoncentrifugalforces．theoutputspeedislessthantheinputspeed．Referredtoasslip．thisnormallyisbetweenl%and3%．BasichydrokineticcouplingsareavailableinconfigurationsfromfractionaltoseveralthousandkW．Fixed-fillfluidcouplings．Fixed-fillfluidcouplingsarethemostcommonlyusedsoft-startdevicesforconveyorswithsimplerbeltprofilesandlimitedconvex/concavesections．Theyarerelativelysimple,1ow-cost,reliable,maintenancefreedevicesthatprovideexcellentsoftstartingresultstothemajorityofbeltconveyorsinusetoday．Variable-filldraincouplings．Drainable-fluidcouplingsworkonthesameprincipleasfixed-fillcouplings．Thecoupling’simpellersaremountedontheACmotorandtherunnersonthedrivenreducerhigh-speedshaft．Housingmountedtothedrivebaseenclosestheworkingcircuit．Thecoupling’srotatingcasingcontainsbleed-offorificesthatcontinuallyallowfluidtoexittheworkingcircuitintoaseparatehydraulicreservoir．Oilfromthereservoirispumpedthroughaheatexchangertoasolenoid-operatedhydraulicvalvethatcontrolsthefillingofthefluidcoupling．Tocontrolthestartingtorqueofasingle-driveconveyorsystem，theACmotorcurrentmustbemonitoredtoprovidefeedbacktothesolenoidcontrolvalve．Variablefilldraincouplingsareusedinmediumtohigh-kWconveyorsystemsandareavailableinsizesuptothousandsofkW．Thedrivescanbemechanicallycomplexanddependingonthecontrolparameters．thesystemcanbeelectronicallyintricate．Thedrivesystemcostismediumtohigh,dependinguponsizespecified．Hydrokineticscoopcontroldrive．Thescoopcontrolfluidcouplingconsistsofthethreestandardfluidcouplingcomponents：adrivenimpeller,adrivingrunnerandacasingthatenclosestheworkingcircuit．Thecasingisfittedwithfixedorificesthatbleedapredeterminedamountoffluidintoareservoir．Whenthescooptubeisfullyextendedintothereservoir,thecouplingisl00percentfilled．Thescooptube,extendingoutsidethefluidcoupling，ispositionedusinganelectricactuatortoengagethetubefromthefullyretractedtothefullyengagedposition．Thiscontrolprovidesreasonablysmoothaccelerationrates．tobutthecomputer-basedcontrolsystemisverycomplex．Scoopcontrolcouplingsareappliedonconveyorsrequiringsingleormultipledrivesfroml50kWto750kW.1．3Variable-frequencycontrol(VFC)Variablefrequencycontrolisalsooneofthedirectdrivemethods．Theemphasizingdiscussionaboutithereisbecausethatithassouniquecharacteristicandsogoodperformancecomparedwithotherdrivingmethodsforbeltconveyor．VFCdevicesProvidevariablefrequencyandvoltagetotheinductionmotor,resultinginanexcellentstartingtorqueandaccelerationrateforbeltconveyordrives．VFCdrives．a(chǎn)vailablefromfractionaltoseveralthousand(kW),areelectroniccontrollersthatrectifyAClinepowertoDCand，throughaninverter,convertDCbacktoACwithfrequencyandvoltagecontro1．VFCdrivesadoptvectorcontrolordirecttorquecontrol(DTC)technology，andcanadoptdifferentoperatingspeedsaccordingtodifferentloads．VFCdrivescanmakestartingorstallingaccordingtoanygivenS-curves．realizingtheautomatictrackforstartingorstallingcurves．VFCdrivesprovideexcellentspeedandtorquecontrolforstartingconveyorbelts．a(chǎn)ndcanalsobedesignedtoprovideloadsharingformultipledrives．easilyVFCcontrollersarefrequentlyinstalledonlower-poweredconveyordrives，butwhenusedattherangeofmedium-highvoltageinthepast．thestructureofVFCcontrollersbecomesverycomplicatedduetothelimitationofvoltageratingofpowersemiconductordevices，thecombinationofmedium-highvoltagedrivesandvariablespeedisoftensolvedwithlow-voltageinvertersusingstep-uptransformerattheoutput，orwithmultiplelow-voltageinvertersconnectedinseries．Three-levelvoltage-fedPWMconvertersystemsarerecentlyshowingincreasingpopularityformulti-megawattindustrialdriveapplicationsbecauseofeasyvoltagesharingbetweentheseriesdevicesandimprovedharmonicqualityattheoutputcomparedtotwo-levelconvertersystemsWithsimpleseriesconnectionofdevices．ThiskindofVFCsystemwiththree750kW/2．3kVinvertershasbeensuccessfullyinstalledinChengZhuangMineforone2．7-kmlongbeltconveyordrivingsysteminfollowingtheprincipleofthree-levelinverterwillbediscussedindetail．2Neutralpointclamped(NPC)three-levelinverterusingIGBTsThree-levelvoltage-fedinvertershaverecentlybecomemoreandmorepopularforhigherpowerdriveapplicationsbecauseoftheireasyvoltagesharingfeatures．1owerdv/dtperswitchingforeachofthedevices，andsuperiorharmonicqualityattheoutput．TheavailabilityofHV-IGBTshasledtothedesignofanewrangeofmedium-highvoltageinverterusingthree-levelNPCtopology．Thiskindofinvertercanrealizeawholerangewithavoltageratingfrom2．3kVto4．16kVSeriesconnectionofHV-IGBTmodulesisusedinthe3．3kVand4．16kVdevices．The2．3kVinvertersneedonlyoneHV-IGBTperswitch[2,3].2．1PowersectionTomeetthedemandsformediumvoltageapplications．a(chǎn)three-levelneutralpointclampedinverterrealizesthepowersection．Incomparisontoatwo-levelinverter．theNPCinverteroffersthebenefitthatthreevoltagelevelscanbesuppliedtotheoutputterminals，soforthesameoutputcurrentquality，only1/4oftheswitchingfrequencyisnecessary．MoreoverthevoltageratingsoftheswitchesinNPCinvertertopologywillbereducedto1/2．a(chǎn)ndtheadditionaltransientvoltagestressonthemotorcanalsobereducedto1/2comparedtothatofatwo-levelinverter．Theswitchingstatesofathree-levelinverteraresummarizedinTable1．U．VandWdenoteeachofthethreephasesrespectively；PNandOarethedcbuspoints．ThephaseU，forexample，isinstateP(positivebusvoltage)whentheswitchesS1uandS2uareclosed，whereasitisinstateN(negativebusvoltage)whentheswitchesS3uandS4uareclosed．Atneutralpointclamping，thephaseisinOstatewheneitherS2uorS3uconductsdependingonpositiveornegativephasecurrentpolarity，respectively．Forneutralpointvoltagebalancing，theaveragecurrentinjectedatOshouldbezero．2．2LinesideconverterForstandardapplications．a(chǎn)l2-pulsedioderectifierfeedsthedividedDC-linkcapacitor．Thistopologyintroduceslowharmonicsonthelineside．Forevenhigherrequirementsa24-pulsedioderectifiercanbeusedasaninputconverter．Formoreadvancedapplicationswhereregenerationcapabilityisnecessary,anactivefront．endconvertercanreplacethedioderectifier,usingthesamestructureastheinverter．2．3InvertercontrolMotorContro1．Motorcontrolofinductionmachinesisrealizedbyusingarotorflux．orientedvectorcontroller．Fig．2showstheblockdiagramofindirectvectorcontrolleddrivethatincorporatesbothconstanttorqueandhighspeedfield-weakeningregionswherethePWMmodulatorwasused．Inthisfigure，thecommandfluxisgeneratedasfunctionofspeed．Thefeedbackspeedisaddedwiththefeedforwardslipcommandsignal.theresultingfrequencysignalisintegratedandthentheunitvectorsignals(cosandsin)aregenerated．ThevectorrotatorgeneratesthevoltageandanglecommandsforthePWMasshown．PWMModulator．ThedemandedvoltagevectorisgeneratedusinganelaboratePWMmodulator．Themodulatorextendstheconceptsofspace-vectormodulationtothethree-levelinverter．Theoperationcanbeexplainedbystartingfromaregularlysampledsine-trianglecomparisonfromtwo-levelinverter．Insteadofusingonesetofreferencewaveformsandonetriangledefiningtheswitchingfrequency，thethree-levelmodulatorusestwosetsofreferencewaveformsUr1andUr2andjustonetriangle．Thus,eachswitchingtransitionisusedinanoptimalwaysothatseveralobjectivesarereachedatthesametime．Verylowharmonicsaregenerated．Theswitchingfrequencyislowandthusswitchinglossesareminimized．Asinatwo-levelinverter,azero-sequencecomponentcanbeaddedtoeachsetofreferencewaveformsinordertomaximizethefundamentalvoltagecomponent．Asanadditionaldegreeoffreedom，thepositionofthereferencewaveformswithinthetrianglecanbechanged．ThiscanbeusedforcurrentbalanceinthetwohalvesoftheDC-1ink．3TestingresultsAfterSuccessfulinstallationofthree750kW/2．3kVthree-levelinvertersforone2．7kmlongbeltconveyordrivingsysteminChengzhuangMine．TheperformanceofthewholeVFCsystemwastested．Fig．3istakenfromthetest，whichshowstheexcellentcharacteristicofthebeltconveyordrivingsystemwithVFCcontroller．Fig．3includesfourcurves．Thecurve1showsthebelttension．Fromthecurveitcanbefindthatthefluctuationrangeofthebelttensionisverysmal1．Curve2andcurve3indicatecurrentandtorqueseparately．Curve4showsthevelocityofthecontrolledbelt．Thebeltvelocityhavethe“s”shapecharacteristic．A1ltheresultsofthetestshowaverysatisfiedcharacteristicforbeltdrivingsystem．4ConclusionsAdvancesinconveyordrivecontroltechnologyinrecentyearshaveresultedinmanymorereliable．Cost-effectiveandperformance-drivenconveyordrivesystemchoicesforusers．Amongthesechoices，theVariablefrequencycontrol(VFC)methodshowspromisinguseinthefutureforlongdistancebeltconveyordrivesduetoitsexcellentperformances．TheNPCthree-levelinverterusinghighvoltageIGBTsmaketheVariablefrequencycontrolinmediumvoltageapplicationsbecomemuchmoresimplebecausetheinverteritselfcanprovidethemediumvoltageneededatthemotorterminals，thuseliminatingthestep-uptransformerinmostapplicationsinthepast．ThetestingresultstakenfromtheVFCcontrolsystemwithNPCthree．1evelinvertersusedina2．7kmlongbeltconveyordrivesinChengzhuangMineindicatesthattheperformanceofNPCthree-levelinverterusingHV-IGBTstogetherwiththecontrolstrategyofrotorfield-orientedvectorcontrolforinductionmotordriveisexcellentforbeltconveyordrivingsystem．中文譯文：帶式輸送機(jī)及其牽引系統(tǒng)在運(yùn)送大量的物料時(shí)，帶式輸送機(jī)在長距離的運(yùn)輸中起到了非常重要的競爭作用。輸送系統(tǒng)將會(huì)變得更大、更復(fù)雜，而驅(qū)動(dòng)系統(tǒng)也已經(jīng)歷了一個(gè)演變過程，并將繼續(xù)這樣下去。如今，較大的輸送帶和多驅(qū)動(dòng)系統(tǒng)需要更大的功率,比方3驅(qū)動(dòng)系統(tǒng)需要給輸送帶750KW(成莊煤礦輸送機(jī)驅(qū)動(dòng)系統(tǒng)的要求)?？刂乞?qū)動(dòng)力和加速度扭矩是輸送機(jī)的關(guān)鍵。一個(gè)高效的驅(qū)動(dòng)系統(tǒng)應(yīng)該能順利的運(yùn)行,同時(shí)保持輸送帶張緊力在指定的平安極限負(fù)荷內(nèi)。為了負(fù)載分配在多個(gè)驅(qū)動(dòng)上，扭矩和速度控制在驅(qū)動(dòng)系統(tǒng)的設(shè)計(jì)中也是很重要的因素。由于輸送機(jī)驅(qū)動(dòng)系統(tǒng)控制技術(shù)的進(jìn)步,目前更多可靠的低本錢和高效驅(qū)動(dòng)的驅(qū)動(dòng)系統(tǒng)可供顧客選擇[1]。1帶式輸送機(jī)驅(qū)動(dòng)1.1帶式輸送機(jī)驅(qū)動(dòng)方式全電壓啟動(dòng)在全電壓啟動(dòng)設(shè)計(jì)中，帶式輸送機(jī)驅(qū)動(dòng)軸通過齒輪傳動(dòng)直接連接到電機(jī)。直接全壓驅(qū)動(dòng)沒有為變化的傳送負(fù)載提供任何控制,根據(jù)滿載和空載功率需求的比率，空載啟動(dòng)時(shí)比滿載可能快3～4倍。此種方式的優(yōu)點(diǎn)是:免維護(hù),啟動(dòng)系統(tǒng)簡單，低本錢，可靠性高。但是，不能控制啟動(dòng)扭矩和最大停止扭矩。因此，這種方式只用于低功率,結(jié)構(gòu)簡單的傳送驅(qū)動(dòng)中。降壓啟動(dòng)隨著傳送驅(qū)動(dòng)功率的增加,在加速期間控制使用的電機(jī)扭矩變得越來越重要。由于電機(jī)扭矩是電壓的函數(shù),電機(jī)電壓必須得到控制，一般用可控硅整流器(SCR)構(gòu)成的降壓啟動(dòng)裝置，先施加低電壓拉緊輸送帶,然后線性的增加供電電壓直到全電壓和最大帶速。但是，這種啟動(dòng)方式不會(huì)產(chǎn)生穩(wěn)定的加速度，當(dāng)加速完成時(shí),控制電機(jī)電壓的SCR鎖定在全導(dǎo)通，為電機(jī)提供全壓。此種控制方式功率可到達(dá)750kW。繞線轉(zhuǎn)子感應(yīng)電機(jī)繞線轉(zhuǎn)子感應(yīng)電機(jī)直接連接到驅(qū)動(dòng)系統(tǒng)減速機(jī)上,通過在電機(jī)轉(zhuǎn)子繞組中串聯(lián)電阻控制電機(jī)轉(zhuǎn)矩。在傳送裝置啟動(dòng)時(shí),把電阻串聯(lián)進(jìn)轉(zhuǎn)子產(chǎn)生較低的轉(zhuǎn)矩，當(dāng)傳送帶加速時(shí)，電阻逐漸減少保持穩(wěn)定增加轉(zhuǎn)矩。在多驅(qū)動(dòng)系統(tǒng)中，一個(gè)外加的滑差電阻可能將總是串聯(lián)在轉(zhuǎn)子繞組回路中以幫助均分負(fù)載。該方式的電機(jī)系統(tǒng)設(shè)計(jì)相對簡單，但控制系統(tǒng)可能很復(fù)雜，因?yàn)樗鼈兪腔谟?jì)算機(jī)控制的電阻切換。當(dāng)今，控制系統(tǒng)的大多數(shù)是定制設(shè)計(jì)來滿足傳送系統(tǒng)的特殊規(guī)格。繞線轉(zhuǎn)子電機(jī)適合于需要400kW以上的系統(tǒng)。直流(DC)電機(jī)大多數(shù)傳送驅(qū)動(dòng)使用DC并勵(lì)電機(jī)，電機(jī)的電樞在外部連接?？刂艱C驅(qū)動(dòng)技術(shù)一般應(yīng)用SCR裝置，它允許連續(xù)的變速操作。DC驅(qū)動(dòng)系統(tǒng)在機(jī)械上是簡單的,但設(shè)計(jì)的電子電路，監(jiān)測和控制整個(gè)系統(tǒng)，相比于其他軟啟動(dòng)系統(tǒng)的選擇是昂貴的，但在轉(zhuǎn)矩、負(fù)載均分和變速為主要考慮的場合,它又是一個(gè)可靠的，節(jié)約本錢的方式。DC電機(jī)一般使用在功率較大的輸送裝置上,包括需要輸送帶張力控制的多驅(qū)動(dòng)系統(tǒng)和需要寬變速范圍的輸送裝置上。1.2液力偶合器流體動(dòng)力偶合器通常被稱為液力偶合器，由三個(gè)根本單元組成：充當(dāng)離心泵的葉輪,推進(jìn)水壓的渦輪和裝進(jìn)兩個(gè)動(dòng)力部件的外殼。流體從葉輪到渦輪，在從動(dòng)軸產(chǎn)生扭矩。由于循環(huán)流體產(chǎn)生扭矩和速度，在驅(qū)動(dòng)軸和從動(dòng)軸之間不需要任何機(jī)械連接。這種連接產(chǎn)生的動(dòng)力決定于液力偶合器的充液量，扭矩正比于輸入速度。因在流體偶合中輸出速度小于輸入速度,其間的差值稱為滑差,一般為1%～3%。傳遞功率可達(dá)幾千千瓦。固定充液液力偶合器固定充液液力偶合器是在結(jié)構(gòu)較簡單和僅具有有限的彎曲局部的輸送裝置中最常用的軟啟動(dòng)裝置，其結(jié)構(gòu)相比照擬簡單，本錢又低，對現(xiàn)在使用的大多數(shù)輸送機(jī)能提供優(yōu)良的軟啟動(dòng)效果?？勺兂湟阂毫ε己掀饕卜Q為限矩型液力偶合器。偶合器的葉輪裝在AC電機(jī)上,渦輪裝在從動(dòng)減速器高速軸上，包含操作部件的軸箱安裝在驅(qū)動(dòng)基座。偶合器的旋轉(zhuǎn)外殼有溢出口,允許液體不斷地從工作腔中流出進(jìn)入一個(gè)別離的輔助腔，油從輔助腔通過一個(gè)熱交換器泵到控制偶合器充液量的電磁閥。為了控制單機(jī)傳動(dòng)系統(tǒng)的啟動(dòng)轉(zhuǎn)矩,必須監(jiān)測AC電機(jī)電流,給電磁閥的控制提供反應(yīng)?？勺兂湟阂毫ε己掀骺墒褂迷谥写蠊β瘦斔拖到y(tǒng)中，功率可到達(dá)數(shù)千千瓦。這種驅(qū)動(dòng)無論在機(jī)械,或在電氣上都是很復(fù)雜的，其驅(qū)動(dòng)系統(tǒng)本錢中等。勺管控制液力偶合器也稱為調(diào)速型液力偶合器。此種液力偶合器同樣由三個(gè)標(biāo)準(zhǔn)的液力偶合單元構(gòu)成，即葉輪、渦輪和一個(gè)包含工作環(huán)路的外殼。此種液力偶合器需要在工作腔以外設(shè)置導(dǎo)管(也稱勺管)和導(dǎo)管腔，依靠調(diào)節(jié)裝置改變勺管開度(勺管頂端與旋轉(zhuǎn)外殼間距)人為的改變工作腔的充液量,從而實(shí)現(xiàn)對輸出轉(zhuǎn)速的調(diào)節(jié)。這種控制提供了合理的平滑加速度，但其計(jì)算機(jī)控制系統(tǒng)很復(fù)雜。勺管控制液力偶合器可以應(yīng)用在單機(jī)或多機(jī)驅(qū)動(dòng)系統(tǒng)，功率范圍為150kW～750kW。1．3變頻控制(VFC)變頻控制也是一種直接驅(qū)動(dòng)方式，它具有非常獨(dú)特的高性能。VFC裝置為感應(yīng)電機(jī)提供變化的頻率和電壓,產(chǎn)生優(yōu)良的啟動(dòng)轉(zhuǎn)矩和加速度。VFC設(shè)備是一個(gè)電力電子控制器,首先把AC整流成DC，然后利用逆變器，再將DC轉(zhuǎn)換成頻率、電壓可控的AC。VFC驅(qū)動(dòng)采用矢量控制或直接轉(zhuǎn)矩控制(DTC)技術(shù)，能根據(jù)不同的負(fù)載采用不同的運(yùn)行速度。VFC驅(qū)動(dòng)能根據(jù)給定