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

b r a d @ a i v i s i o n . c o m

b r a d @ a i v i s i o n . c o m

P=2

This is from memory so someone correct me if I'm wrong.

Matthew

Matthew Gunn wrote:

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.

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

and that seems to jibe with a quick turn around my Evershed & Vignoles "PowerRotor" circular calculator...

Anybody with a crib-sheet?

Geoff.

Geoff wrote:

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

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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