Mechanical Power Calculations

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

Reply to
Brad Smallridge
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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

Reply to
Matthew Gunn

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.

Reply to
Geoff

Yep, I should have mentioned T must be in Nm.

Reply to
Matthew Gunn

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.

Reply to
Brad Smallridge

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