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Posted by Matthew Gunn on March 23, 2005, 12:17 am
Geoff wrote:
> Matthew Gunn wrote:
>
>> Brad Smallridge wrote:
>>> 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
>> 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.
>
>
> 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.
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> 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
>
>
>