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AE-2010-003
OneLinevsTwoLineVariableMotorHydraulic
Controls
ExternalPartnerXInternalDanfossOnly
ApplicationEngineeringNotesarepublicationsintendedtosharecircuits,products,andotherusefulinformationnototherwise
foundinDanfosspublications.AENotesarewrittentoinformandaidthereaderinthesuccessfulapplicationofDanfossproducts.
ExecutiveSummary
DifferentcontrolstrategiesareusedonM46andL/Kmotors.ThisAEnotediscussesthesestrategies
andtheadvantages/disadvantagesalongwithsystemdesignconsiderations.
Products:M46VariableMotor
L/KVariableMotor
Background:TheSAEflangedM46MVandL/Kvariablemotorsareeachavailablewithastandard
one-lineoroptionaltwo-linecontrol.Thedesignofbothmotorsissimilarinthatbothmotorsutilizea
servopistonspringthatmechanicallybiasesthemotortomaximumdisplacement.Theswashplate
bearingforeachmotorisajournalbearingmaterial,althoughofdifferentdesignandmaterial.
Withaone-linecontrolthespringendoftheservopistonisinternallydrainedtomotorcase,andthe
X1port(oppositethespring)iseitherdrainedorpressurized,viaacustomersuppliedexternaltwo-
positionthree-way(2P3W)shiftvalve.Theshiftvalvehassupply,drainandcontrol(X1)port.WhenX1
ispressurized,thecontrolpressureatX1overcomesthespringforceandmovestheswashplateto
minimumdisplacement.WithanX1pressureof14-28bar,themotorwillshifttominimum
displacementovercomingallspring,bearingfrictionandmotoring(strokeincreasing)moments.When
X1isdrained,
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