Motor Power, Torque, Force

[Brett Ball]

FORCE / TORQUE CALCULATIONS

Hi,
Not done this sort of things since college days.
Some input would be much appreciated.

Please refer to the attached .pdf. The diagram is a schematic drawing only.

In order to determine the weld size, I need to calculate the force (N) at the diameter of the welds (888mm).

The inner flange is driven by a 250 kW motor which has a rotational speed of 42 rpm.
Given that motor power Kw=(T*rpm )/9552.4 where T=Torque (N m).

 T=(kW*9552.4)/rpm  T=(250*9552.4)/42  T=56859.5 N m

I calculate that the force at the weld diameter to be:-

force at weld=56859.5*((888/2)/1000)

 force at weld=128062 N

I deduce that the welds will be in shear.

 

Flange weld shear calc.pdf