
Torque,power calculation and Motor selection  
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Mechanical Engineering Forum 
Posted by: enahs ^{®} 09/06/2010, 07:03:14 Author Profile eMail author Edit 
Dear All,
It will be a great help if anyone could help me solving this problem. I am a beginner in this and not able to conclude certain things. I need to select a geared motor for the below system. System Details It has a hollow shaft and a Drum Drum is of ID 3 m, OD 7m and width 5m The drum is attached to the shaft through steel rods as shown in the figure. Weight of the drum is 235 ton (density = 1500 kg/m3) Shaft is 10 m in length, ID of 450mm and OD 600mm and is simply supported by bearings at both the ends.( I have used combined bending and torsion equations to arrive at the diameter the shaft and designed for fatigue.)
The weight of the system is calculated as 250 tons
The calculation I used are as follows
To find torque (T), I used equations like

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: Torque,power calculation and Motor selection  
: Torque,power calculation and Motor selection  enahs 
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Mechanical Engineering Forum 
Posted by: enahs ^{®} 09/07/2010, 04:56:19 Author Profile eMail author Edit 
I will try to expalin in detail.Please correct me
if I wrong. I have calculated T = I a where a = angular acceleration I = mass moment of inertia a = v/t where v= angular velocity t = time in seconds v= 2 pi N /60 where N = rpm Here N= 1000rpm
Now a= v/t
Mass moment of inertia = 4.68 * 10^9 Kgm^2 T = I a
This torque seems to be very huge.The torque increases as we
To select a motor with this torque seems to be hard when we

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