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1、TheshallowtreadsintothePLCcontroltechniqueanddevelopmenttrendofelectricalengineering1.Sayall:Alongwiththemicro-electronicstechniqueandthecalculatortechnicalhairExhibition,theprogrammableprefacecontrollerhasanadvancebyleapsandboundsofhairExhibition,itsfunctionhasalreadyoutrunalogiccontrolfa
2、randfar,inproperorderThescopeofcontrol,ithasaneffecttocombinewithcalculator,canenterGotoimitatetocontrolmost,havealongrangecorrespondencefunctionetc..Have-ThepersoniscalleditthemodernDindustrycontrolsofthreepaypillargreatly(namelyPLC,robot,CAD/CAM)ita,currentlyprogrammablecontrollerBEappli
3、edinmetallurgyextensively,Mineralindustry,machine,lightClassDrealm,automatefortheindustryProvidedtothereisthetoolofonedintThePLCcontrolsoftreadtoopenthewreathservoorganizationintotheelectricalengineeringshouldUsedforcombiningtoolmachinetoproduceanon-linenumbertocontrolaslipperypedestaltoco
4、ntrolautomaticallyMake,cantheprovincegotothenumberofthatunittocontrolsystem,makingthatunitThecostofcontrollingthesystemlowers.2、Whatisasteppermotor：Steppermotorisakindofelectricalpulsesintoangulardisplacementoftheimplementingagency.Popularlittlelesson:Whenthedriverreceivesasteppulsesignal,
5、itwilldriveasteppermotortosetthedirectionofrotationatafixedangle(andthestepangle).Youcancontrolthenumberofpulsestocontroltheangulardisplacement,soastoachieveaccuratepositioningpurposes;thesametimeyoucancontrolthepulsefrequencytocontrolthemotorrotationspeedandacceleration,toachievespeedcont
6、rolpurposes.Whatkindsofsteppermotorsub-：Inthreesteppermotors:permanentmagnet(PM),reactive(VR)andhybrid(HB)permanentmagnetstepperusuallytwo-phase,torque,andsmaller,stepangleof7.5degreesorthegeneral15degrees;reactionstepisgenerallythree-phase,canachievehightorqueoutput,stepangleof1.5degreesi
7、sgenerally,butthenoiseandvibrationarelarge.80countriesinEuropeandAmericahavebeeneliminated;hybridstepperisamixofpermanentmagnetandreactiveadvantages.Itconsistsoftwophasesandthefive-phase:two-phasestepangleof1.8degreeswhilethegeneralfive-phasestepangleof0.72deg
