Motor torque requirments to rotate a steel tube that is in contact with another steel tube

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  • Thread starter Tony2560
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Tony2560
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I have a problem,
I need to calculate the torque required to rotate a steel tube 150mm OD, 90mm ID which is being pressed against a identical tube with a force of 100 Tons
also the estimated torque imparted if the above parts come into contact with one part static and the second part rotating at 200 rpm
 

Answers and Replies

  • #2
tech99
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100t = 10^5 kg = 10^6 N.
To gain a ball-park idea, assume mu = 1
Torque = diameter x force = (150/1000) x 10^6 = 1.5 x 10^5 N-m
If one part is moving or stationary will make a difference to mu.
Power to rotate tube = torque x speed = 1.5 x 10^5 x (200/60) = 5 x 10^5 W
You will require about 500kW to rotate the tube, which may melt, depending on its mass/length.
 

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