the equivalent torque

please can tell me the formulae by what i can calculate the equivalent torque in order to calculate afterward equivalent capacity and make a choice for an adequate motor,
and that in the case of crane.
thank you in advance.

 

[Alex68]

Look at thread237-30337

 

[electricpete]

The relationship between torque and mechanical power is
P=2*Pi*Torque*Speed
in American units
Power=Torque*Speed/5250
Power in hp
Torque in lbf-ft
Speed in RPM


I'm not sure what considerations apply for crane motor selection.

 

[jbartos]

Suggestion: Visit

http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm

for more info

 

[jbartos]

Small encore: Visit

http://www.abe.iastate.edu/ae342/hydropowerexample.pdf

for different relationships