roll torque due to tension

[sf1]

Hello,

I would like to know how to calculate the torque required to turn a roll which is supported symmetrically at both ends by bearings. A load is placed in the center of the roll due to the tension developed in the belt by the take up system on the other side of the conveyor. This same calculation is relevant when I am using round orange go belt to drive multiple rolls of off one drive shaft. I think this torque is related to the type of bearings used to support the rolls or shaft but I am not sure if I am not considering something else in the system? Any design info or books would be great.

Thanks

 

[tbuelna]

sf1,

Rolling element bearings will have mechanical losses due to skidding, lubricant churning, seal friction, retainer contact, etc. The magnitude of these losses will be in proportion to how well they are designed, manufactured, mounted, lubricated and maintained.

However, the bearing losses are probably fairly small in comparison to the hysteresis and friction losses in a rubber belt drive. Check the references provided by your belt vendor.

 

[dvd]

You also may need to consider the acceleration torque to start the system.

Look for conveyor information at:

http://www.cemanet.org/

CEMA has several publications you may find helpful.