>> P.427
Ⅲ27ConsiderationofOperationPatterns■CalculationofeffectivetorqueandeffectivethrustforceAsalargetorque(thrustforce)isrequiredforacceleration/decelerationwhentheprecisionpositioningtableisdriven,theeffectivetorque(effectivethrustforce)maybecomelargerthanthemotor'sratedtorque(ratedthrust)dependingontheoperationrateofeachpatternincasetheACservomotororlinearmotordriveisused.Continuingtheoperationinthisconditionmaycauseoverheatingandseizureofthemotor.Soensurethattheeffectivetorque(effectivethrustforce)issmallerthanmotor'sratedtorque(ratedthrust).Theeffectivetorque(effectivethrustforce)bytheoperationpatternoftableiscalculatedbythefollowingequation.Iftheratedtorque(ratedthrust)ofthemotorislargerthantheeffectivetorque(effectivethrustforce),continuousoperationaccordingtotheoperationpatternispossible.IfACservomotorisused●EffectivetorqueTrmsTrms=[N・m]Incaseoflinearmotordrive●EffectivethrustforceFrmsFrms=[N]Incaseofdirectdrive(SA…DE)●Effectivethrustforce(applicabletoSA…DE/X(Y))FrmsFrms=[N]●Effectivetorque(applicabletoSA…DE/S)MrmsMrms=[N・m]TimeTime1circletimettaTa(Fa)TP(FP)TL(FL)tctaVSpeedTorque(thrustforce)TP2×ta+(TP-2×TL)2×ta+TL2×tctFP2×ta+(FP-2×FL)2×ta+FL2×tctTimeTime1circletimettaFa(Ma)FP(MP)FL(ML)tctaVSpeed(rotationspeed)Thrustforce(torque)FP2×ta+(FP-2×FL)2×ta+FL2×tctMP2×ta+(MP-2×ML)2×ta+ML2×tct
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