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Torque,power calculation and Motor selection
##### Mechanical Engineering Forum
Posted by: enahs ®

09/06/2010, 07:03:14

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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 shaft material density is 7850 kg/m3

The weight of the system is calculated as 250 tons
In short
A 250 ton weighing system has to rotate in 1000 rpm using a geared motor.

The calculation I used are as follows
To find power, I need to know the torque
2 pi NT /60

To find torque (T), I used equations like
Method - 1 T = I a ( a=accleration)
a = 0.17 (to reach 1000rpm in 60 min)
Method - 2 T = F R
Where F = m vr2(v=angular velocity)
Is this the correct approach and how do I chose a correct motor for this system

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