I am running a spread sheet on some Jameco motors. The catalog gives gm-cm and rpm. How do you calculate the mechanical power output in watts?
Thanks
b r a d @ a i v i s i o n . c o m
Mechanical Power Calculations
Mar 22, 2005
4 Replies
P=2*pi*n*T P=power pi=3.1415....... n=rpm T=Torque
This is from memory so someone correct me if I'm wrong.
Matthew
Hmm, I'm working from memory, too, but the units don't look right... The OP had gm.cm, so to get to SI there's a division by 10^5 And watts are Nm/s, so there's a g=9.81, and a 60 for the RPM to seconds. So I'd say:
watts = gm.cm.RPM x (2*pi*9.81)/(60*10^5)
and that seems to jibe with a quick turn around my Evershed & Vignoles "PowerRotor" circular calculator...
Anybody with a crib-sheet?
Geoff.
Yep, I should have mentioned T must be in Nm.
There is also the issue of what is listed in the Jameco catalogs. Running torque or stall torque. Also an issue I suppose. Just looking for an easy answer.
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