Interestingfacts; Servos - Faller 180725 Bedienungsanleitung

Interestingfacts
8.

Servos

What is a servo?
Aservoisadevicethatisabletotransformcontrolcommandsintomechan-
EN
icalmotions.
Types
Inmodelmakingwespeakofanaloganddigitalservos.Inananalogservo
theelectronicequipmentfeaturesananalogstructure.Inadigitalservothe
positionofthemotorisdetectedintheformofanumericalvalueandcom-
paredwithadesiredvaluebyanappropriatecomputingcircuit.Digitalser-
vosfeatureahigherangularresolutionandtheirpositionisadjustedmore
quickly and more accurately. Digital servos can often be reprogrammed,
whichallowstoadaptthespeed,theoverloadprotectionandsimilartothe
specificapplication,dependingontheservoversion.However,theauxil-
iaryenergyrequiredbydigitalservosaswellastheirpricearehigherthan
thoseofanalogservos.
Structure
Aservoiscomposedofadriveunitandatriggeringunitsuchasforinstance
anelectricmotorwithelectroniccontrolsystem.Themotormustbeable
torotateinbothdirections,andthesystemmustbeabletodeterminethe
rotatingpositionofthemotoratanymoment.Theelectricconnectionofa
servoiscarriedoutusingthreewires.Twofortheoperatingvoltage("plus"
and"minus")andoneforthepulse("Desiredvalue").
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