Rockwell Automation 9329 Drive Application Software - Manual (Page 9)

FM – Diameter Calculation
Drive Application Software – page 9 of 30
3.2 Diameter effects on surface tension
If the torque applied to a driven section is kept constant, the tension applied to the product at
the surface of the roll will decrease as the diameter of the driven section increases. To
maintain constant tension on the product, the torque must be increased proportional to the
change in diameter. If the roll diameter doubles the torque applied must double to maintain
constant product tension at the surface of the roll.
0
20
40
60
80
100
120
4 8 12 16 20 24 28 32 36 40 44 48 52
Roll Diameter
Torque / Tension
Surface Tension (lbs)
Motor Torque (lbft)
GearRatio
on(lbs) (ft)*Tensi RollRadius
e(lbft) MotorTorqu
2
er(ft) RollDiamet
(ft) RollRadius
12
er(in) RollDiamet
er(ft) RollDiamet
=
=
=