Danfoss丹佛斯AE-2010-003 One line vs two-line variable motor hydraulic controls 应用指南.pdf

Danfoss丹佛斯AE-2010-003 One line vs two-line variable motor hydraulic controls 应用指南.pdf

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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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