Ball screwWμ:Coefficient of frictiontimetimet1t2t3n1n3n2T1T2T3tOutput speedLoad torgue19SA seriesSelection Example of Planetary Gear DriveIn the case of ball screw (vertically)1.A calculation of the load torque(1)A driving pattern2.Examination of the allowable torque(Cf. rating list) 10.19Nm > 10.12 : Average load torque for 100W 3.Examination of the peak torque(Cf. rating list) Because it has no reverse of power as 30.6Nm > 30.29Nm, you shall change to the upper 200W model (61.2Nm > 30.29Nm). 4.Examination of the maximum torque at the time of an emergency(Cf. rating list) 5.Examination of the allowable radial load(Cf. rating list) 6.Examination of the allowable axial load(Cf. rating list) (2)The output torque in routine T2=9.8(1+μ)W・P/2πηs=5.30Nm (3)Acceleration/Deceleration torque ①Acceleration in accelerating operation α1 is calculated the following formula α1=V/t1=0.01m/s2 ②Acceleration torque T1=9.8(1+μ)Wα1=19.99Nm・・・Acceleration torque (T1+T2) 25.30Nm ③Acceleration in reducing operation α2 is calculated the following formula α2=V/t3=0.01m/s2 ④Deceleration torque T3=9.8(1+μ)Wα2=16.01Nm・・・Deceleration torque (T2+T3) 10.70Nm (4)Average load torque Tm={(t1T13+t2T23+t3T33)/(t1+t2+t3)}1/3=10.12Nm (5)The decision of the reduction ratio I=Nt/n=30 Nt:Rated input rotation speed (3000rpm) (6)The temporary selection of the model number from performance list (Select temporarily SA19S35) Select the most nearest value 35 from reduction ratio valuesNotationW n P ηs V T1 T2 T3 t1 t2 t3 μ Carrier weight Output shaft rotation speed Screw lead Screw efficiency Load speed Acceleration torque Torque in routine Deceleration torque Time in acceleration speed Time in routine speed Time in Deceleration speed A friction coefficient of bearing and othersExplanationAn initial value / unit150kg 100rpm 0.02m 0.9 2.00m/min ※Nm ※Nm ※Nm 2.5sec 30sec 3sec Define 0.02