>> P.443
ConsiderationofOperationPatterns■CalculationofeffectivetorqueandeffectivethrustforceAsalargetorque(thrustforce)isrequiredforacceleration/decelerationwhentheprecisionpositioningtableisdriven,theeffectivetorque(effectivethrustforce)maybecomelargerthanthemotor'sratedtorque(ratedthrust)dependingontheoperationrateofeachpatternincasetheACservomotororlinearmotordriveisused.Continuingtheoperationinthisconditionmaycauseoverheatingandseizureofthemotor.Soensurethattheeffectivetorque(effectivethrustforce)issmallerthanmotor'sratedtorque(ratedthrust).Theeffectivetorque(effectivethrustforce)bytheoperationpatternoftableiscalculatedbythefollowingequation.Iftheratedtorque(ratedthrust)ofthemotorislargerthantheeffectivetorque(effectivethrustforce),continuousoperationaccordingtotheoperationpatternispossible.TimeTimeTimeTimeTa(Fa)tatcta1circletimetFa(Ma)tatcta1circletimetVTP(FP)TL(FL)SpeedTorque(thrustforce)VFP(MP)FL(ML)Speed(rotationspeed)Thrustforce(torque)N・m][Trms=TP2×ta+(TP-2×TL)2×ta+TL2×tctIfACservomotorisused●EffectivetorqueTrmsIncaseoflinearmotordrive●EffectivethrustforceFrms2×ta+(FP-2×FL)2×ta+FL2×tc[N]tFrms=FPIncaseofdirectdrive(SA…DE)●Effectivethrustforce(applicabletoSA…DE/X(Y))Frms2×ta+(FP-2×FL)2×ta+FL2×tc[N]tFrms=FP●Effectivetorque(applicabletoSA…DE/S)MrmsN・m][2×tct2×ta+(MP-2×ML)2×ta+MLMPMrms=Ⅲ27
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