>> P.445
ConsiderationofOperationPatternsIncaseoflinearmotordriveTheeffectivethrustforcemayexceedtheratedthrustdependingontheoperationrateofLinearMotorTable,leadingtomotoroverheatingandseizurethatmaycausebreakageandhumaninjury.Beforeoperations,ensurethattheeffectivethrustforceisbelowtheratedthrust.DescribedbelowisanexampleofconsiderationofoperationpatternwithLT170HS.TemporarilysettheoperationpatternasindicatedbelowconsideringthecarryingmassandaccelerationfromthedynamicloadmasschartinpageⅡ-306.STEP1Calculationofthrustforcerequiredforacceleration①ForcefromrunningresistanceFLFL=fV×FR+Fc=2.25×40+1=91N②ForcefromaccelerationFaFa=(WL+WT)・=(30+4.0)×=170NVta1.50.3③ThrustforcerequiredforaccelerationFPFP=Fa+FL=170+91=261NAtthispoint,checkthattheFP×k(factorofsafety)isbelowthethrustcharacteristicscurveinpageⅡ-306.Ifthisvalueisexceeded,reviewthemaximumspeedforoperatingpatternandacceleration/decelerationtime.Youcanseeintheexamplepatternthatitisbelowthethrustcharacteristicscurve.MaximumthrustFMat1.5m/s=About550NFP×k=261×1.3=339.3N<FMTimeSTEP2Considerationofeffectivethrustforce・EffectivethrustforceFrmscanbeobtainedasfollows.Frms=2×ta+(FP-2×FL)2×ta+FL2×tcFPtTime2612×0.3+(261-2×91)2×0.3+912×0.5=2.5LFaVFPFLSpeedThrustforce≒103NAtthispoint,checkthatFrmsisbelowtheratedthrust.Iftheratedthrustisexceeded,reviewthemaximumspeedforoperatingpatternandacceleration/decelerationtime.(ForLT…H,thrustcharacteristicsvarydependingonambienttemperature.Seetheratedthrustcharacteristicsdiagram.)Fortheexamplepattern,theratedthrustisabout117Nattheambienttemperatureof30℃,sothevalueis103N<117N(ratedthrust)anditcanbejudgedthatcontinuousoperationispossible.tatctatSettingitemsTablespecificationModelMassofmovingtableMaximumthrustattravelingspeedVRunningresistanceSpeedcoefficientCarryingmassTravelingdistanceTravelingspeed(setspeed)TimeCordpull-resistanceFactorofsafetyAmbienttemperatureⅢ29WTFMFRfVWLLVtatctFcLT170HS(naturalaircooling)4.0kgSeepageⅡ-323About550NSeepageⅡ-306See[IncaseofLT…H]inthesectionofcalculationofmarginalaccelerationtime.30kg1.2m1.5m/s0.3s0.5s2.5s1.0NExpectedvaluek1.330℃
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