W2:Weight of the beltW3:Weight of the sprocketW1The weight of the carrierDLoad torguetimeOutput speedtimet1t2t3n1n3n2T1T2T3t17SA seriesSelection Example of Planetary Gear DriveIn the case of Turn Table Drive1.A calculation of the load torque(1)A driving pattern2.Examination of the allowable torque(Cf. rating list) 25.92Nm > 19.59 : Average load torque for 50W 3.Examination of the peak torque(Cf. rating list) 77.77Nm > 34.3Nm 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=9.8μ(W1+W2+2W3)D/2=19.6Nm (3)Acceleration/ Deceleration torque ①GD2=(W1+W2+(1/2)(2W3))D2=18.75kgm2 ②Acceleration torque T1=9.8GD2・n/375・t1=9.8Nm・・・Acceleration torque (T1+T2) 29.4Nm ③Deceleration torque T3=9.8GD2・n/375・t3=14.7Nm・・・Deceleration torque (T2+T3) 34.3Nm (4)Average load torque Tm={(t1T13+t2T23+t3T33)/(t1+t2+t3)}1/3=19.59Nm (5)The decision of the reduction ratio I=Nt/n=50 Nt:Rated input speed (3000rpm) (6)The temporary selection of the model number from performance list (Select temporarily SA24S45) Select the most nearest value 45 from reduction ratio values.NotationW1 W2 W3 D n V T1 T2 T3 t1 t2 t3 μ A device and work weight The outer diameter of the device Acceleration torque Torque in routine Deceleration torque Average number of revolutions in accelerating speed Number of revolutions in routine speed Average number of revolutions in Deceleration speed Time in acceleration speed Time in routine speed Time in Deceleration speed A friction coefficient of bearing and others The center radius of the bearing ExplanationAn initial value / unit50kg 20 5 0.5m 60rpm 94.25m/min ※Nm ※Nm ※Nm 3sec 3600sec 2sec Define 0.1