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1、TheshallowtreadsintothePLCcontroltechniqueanddevelopmenttrendofelectricalengineering1.Sayall:Alongwiththemicro-electronicstechniqueandthecalculatortechnicalhairExhibition,theprogrammableprefacecontrollerhasanadvancebyleapsandboundsofhairExhibition,itsfunctionhasalreadyo
2、utrunalogiccontrolfarandfar,inproperorderThescopeofcontrol,ithasaneffecttocombinewithcalculator,canenterGotoimitatetocontrolmost,havealongrangecorrespondencefunctionetc..Have-ThepersoniscalleditthemodernDindustrycontrolsofthreepaypillargreatly(namelyPLC,robot,CAD/CAM)it
3、a,currentlyprogrammablecontrollerBEappliedinmetallurgyextensively,Mineralindustry,machine,lightClassDrealm,automatefortheindustryProvidedtothereisthetoolofonedintThePLCcontrolsoftreadtoopenthewreathservoorganizationintotheelectricalengineeringshouldUsedforcombiningtoolm
4、achinetoproduceanon-linenumbertocontrolaslipperypedestaltocontrolautomaticallyMake,cantheprovincegotothenumberofthatunittocontrolsystem,makingthatunitThecostofcontrollingthesystemlowers.2、Whatisasteppermotor：Steppermotorisakindofelectricalpulsesintoangulardisplacementof
5、theimplementingagency.Popularlittlelesson:Whenthedriverreceivesasteppulsesignal,itwilldriveasteppermotortosetthedirectionofrotationatafixedangle(andthestepangle).Youcancontrolthenumberofpulsestocontroltheangulardisplacement,soastoachieveaccuratepositioningpurposes;thesa
6、metimeyoucancontrolthepulsefrequencytocontrolthemotorrotationspeedandacceleration,toachievespeedcontrolpurposes.Whatkindsofsteppermotorsub-：Inthreesteppermotors:permanentmagnet(PM),reactive(VR)andhybrid(HB)permanentmagnetstepperusuallytwo-phase,torque,andsmaller,stepang
7、leof7.5degreesorthegeneral15degrees;reactionstepisgenerallythree-phase,canachievehightorqueoutput,stepangleof1.5degreesisgenerally,butthenoiseandvibrationarelarge.80countriesinEuropeandAmericahavebeeneliminated;hybridstepperisamixofpermanentmagnetandreactiveadvantages.I
8、tconsistsoftwophasesandthefive-phase:two-phasestepangleof1.8degreeswhilethegeneralfive-phasestepangleof0.72deg
