《步进电机及单片机英文文献及翻译》由会员分享，可在线阅读，更多相关《步进电机及单片机英文文献及翻译（30页珍藏版）》请在金锄头文库上搜索。
1、外文文献：KnowledgeofthesteppermotorWhatisasteppermotorSteppermotorisakindofelectricalpulsesintoangulardisplacementoftheimplementingagency.Popularlittlelesson:Whenthedriverreceivesasteppulsesignal,itwilldriveasteppermotortosetthedirectionofrotationatafixedangle(andthestepangle).Youcancontrolthenumberofpu
2、lsestocontroltheangulardisplacement,soastoachieveaccuratepositioningpurposes;thesametimeyoucancontrolthepulsefrequencytocontrolthemotorrotationspeedandacceleration,toachievespeedcontrolpurposes.WhatkindsofsteppermotorsubInthreesteppermotors:permanentmagnet(PM),reactive(VR)andhybrid(HB)permanentmagne
3、tstepperusuallytwo-phase,torque,andsmaller,stepangleof7.5degreesorthegeneral15degrees;reactionstepisgenerallythree-phase,canachievehightorqueoutput,stepangleof1.5degreesisgenerally,butthenoiseandvibrationarelarge.80countriesinEuropeandAmericahavebeeneliminated;hybridstepperisamixofpermanentmagnetand
4、reactiveadvantages.Itconsistsoftwophasesandthefive-phase:two-phasestepangleof1.8degreeswhilethegeneralfive-phasestepangleof0.72degreesgenerally.ThemostwidelyusedStepperMotor.Whatistokeepthetorque(HOLDINGTORQUE)Howmuchprecisionsteppermotor?WhetherthecumulativeThegeneralaccuracyofthesteppermotorstepan
5、gleof3-5%,andnotcumulative.SteppermotortoallowtheminimumamountofsurfacetemperatureSteppermotortoallowtheminimumamountofsurfacetemperature：Steppermotorcausesthemotortemperatureistoohighthefirstmagneticdemagnetization,resultinginlossoftorquedownevenfurther,sothemotorsurfacetemperatureshouldbethemaximu
6、malloweddependingonthemotordemagnetizationofmagneticmaterialpoints;Generallyspeaking,themagneticdemagnetizationpointsareabove130degreesCelsius,andsomeevenashighas200degreesCelsius,sothesteppermotorsurfacetemperatureof80-90degreesCelsiusisnormal.HowtodeterminethesteppermotordriverDCpowersupplyDetermi
7、nationofthevoltageHybridsteppingmotordriverpowersupplyvoltageisgenerallyawiderange(suchastheIM483supplyvoltageof1248VDC),thesupplyvoltageisusuallybasedontheworkofthemotorspeedandresponsetotherequesttochoose.Ifthemotoroperatingspeedhigherorfasterresponsetotherequest,thenthevoltagevalueishigh,butnotet
8、hattheripplevoltagecannotexceedthemaximuminputvoltageofthedrive,oritmaydamagethedrive.DeterminationofCurrentPowersupplycurrentisgenerallybasedontheoutputphasecurrentdriveItodetermine.Ifalinearpowersupply,powersupplycurrentisgenerallypreferable1.1to1.3timestheI;ifweadopttheswitchingpowersupply,powers
9、upplycurrentisgenerallypreferabletoI,1.5to2.0times.ThemaincharacteristicsofsteppingmotorAsteppermotordrivecanbeaddedoperatepulsedrivesignalmustbenopulsewhenthesteppermotoratrest,suchasIfaddingtheappropriatepulsesignal,itwilltoacertainangle(calledthestepangle)rotation.Rotationspeedandpulsefrequencyis
10、proportionalto.2 Dragonstepanglesteppermotorversionis7.5degrees,360degreesaround,takes48pulsestocomplete.3 steppermotorhasinstantstartandrapidcessationofsuperiorcharacteristics.Changethepulseoftheorderof4,youcaneasilychangethedirectionofrotation.Therefore,thecurrentprinters,plotters,robotics,andsode
11、vicesarethecoreofthesteppermotorasthedrivingforce.SteppermotorcontrolexampleWeusefour-phaseunipolarsteppermotorasanexample.ThestructureshowninFigure1:Fourfour-phasewindingleads(asopposedtophaseA1A2B1phasephaseB2)andtwopubliclines(tothepowerofpositive).Thewindingsofonephasetothepoweroftheground.Sotha
12、tthewindingswillbeinspired.Weusefour-phaseeight-beatcontrol,ie,1phase2phasealternatingturn,wouldenhanceresolution.0.9stepcanbetransferredtocontrolthemotorexcitationistransferredinorderasfollows:Iftherequirementsofmotorreversal,thetransmissionexcitationsignalcanbereversed.2controlschemeControlsystemb
13、lockdiagramisasfollowsTheprogramusesAT89S51asthemaincontroldevice.ItiscompatiblewiththeAT89C51,butalsoincreasedtheSPIinterfaceandthewatchdogmodule,whichnotonlymakesthedebuggingprocessbecomeseasyandalsomorestable.Themicrocontrollerintheprogrammainlyforfieldsignalacquisitionandoperationofthesteppermot
14、ortocalculatethedirectionandspeedinformation.ThensenttotheCPLD.CPLDwithEPM7128SLC84-15,EPM7128programmablelogicdeviceoflarge-scale,fortheALTERAcompanysMAX7000family.Highimpedance,electricallyerasableandothercharacteristics,canbeusedforthe2500unit,theworkingvoltageof+5V.CPLDreceivesinformationsentfro
15、mthemicrocontrollerafterconvertedtothecorrespondingcontrolsignaloutputtothesteppermotordrive.Putthecontrolsignaldrivesthemotorwindingsaftertheinput,toachieveeffectivecontrolofthemotor.2.1ThehardwarestructureofthemotordriveMotordriveusingthefollowingcircuit:R1-R8inwhichtheresistancevalueof320-R12resi
16、starRSvalue2.2KQ.-Q4asDarlingtonD401A,Q5-Q8fortheS8550.J1,J2andthesteppermotorconnectedtothesix-lead。AdvantagesanddisadvantagesofsteppermotorAdvantages1. Themotorrotationangleisproportionaltothenumberofpulses;2. Whenthemotorstoppedwithamaximumtorque(whenthewindingexcitationtime);3. Sincetheaccuracyofeachstepinthethreepercenttofivepercent,andtheerrorwillnotaccumulatetothenextstepandthushas
