Stepping Motor Basic

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1、IndustrialCircuitsApplicationNoteStepperMotorBasicsAsteppermotorisanelectromechanicalDisadvantagesdevicewhichconvertselectricalpulsesinto15°1.Resonancescanoccurifnotdiscretemechanicalmovements.Theshaftproperlycontrolled.AorspindleofasteppermotorrotatesinD'discretestepincrementswhenelectri

2、cal2.NoteasytooperateatextremelyBcommandpulsesareappliedtoitinthehighspeeds.propersequence.Themotorsrotationhas16severaldirectrelationshipstotheseapplied2C'inputpulses.ThesequenceoftheappliedOpenLoopOperationC5pulsesisdirectlyrelatedtothedirectionofOneofthemostsignificantadvantages34motor

3、shaftsrotation.ThespeedoftheofasteppermotorisitsabilitytobemotorshaftsrotationisdirectlyrelatedtoaccuratelycontrolledinanopenloopDB'thefrequencyoftheinputpulsesandthesystem.OpenloopcontrolmeansnolengthofrotationisdirectlyrelatedtothefeedbackinformationaboutpositionisA'numberofinputpulsesa

4、pplied.needed.ThistypeofcontroleliminatestheneedforexpensiveFigure1.Cross-sectionofavariable-sensingandfeedbackdevicessuchasreluctance(VR)motor.StepperMotorAdvantagesopticalencoders.YourpositionisandDisadvantagesknownsimplybykeepingtrackoftheinputsteppulses.Advantages1.Therotationangleoft

5、hemotorisStepperMotorTypesproportionaltotheinputpulse.Therearethreebasicsteppermotor2.Themotorhasfulltorqueatstand-types.Theyare:NNSNSNstill(ifthewindingsareenergized)•Variable-reluctance3.Precisepositioningandrepeat-•Permanent-magnetabilityofmovementsincegoodSNsteppermotorshaveanaccuracy

6、of•Hybrid3–5%ofastepandthiserrorisnoncumulativefromonesteptoVariable-reluctance(VR)Sthenext.Thistypeofsteppermotorhasbeen4.Excellentresponsetostarting/aroundforalongtime.Itisprobablystopping/reversing.theeasiesttounderstandfromaFigure2.PrincipleofaPMortin-canstructuralpointofview.Figure15

7、.Veryreliablesincetherearenocon-showsacrosssectionofatypicalV.R.steppermotor.tactbrushesinthemotor.steppermotor.ThistypeofmotorThereforethelifeofthemotorisconsistsofasoftironmulti-toothedsimplydependantonthelifeoftheSrotorandawoundstator.Whenthebearing.statorwinding