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calculating motor power

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redlines

Mechanical
Oct 23, 2003
4
I'm attempting to measure the output power of an air motor. I have measured torque in in*lbs, and speed in RPM. Power in Watts should be:

Watts = torque * rpm
= lb.in * rev/m * 44.25

My calculated numbers seem low. Am I missing something?

Thanks
 
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P(Watts) = T x w

Where, T = torque in N-m
w = angular velocity = 2 x Pi x N/60, where N is RPM.

So P = 2 x Pi x N x T/60

1 lb-in = 0.113 Nm

So P (watts) = 0.93 x T(lb-in) x N (RPM)

Regards,






Believe it or not : Though human body is made up of intricate and subtle mechanism, it is very poor in energy conversion. The maximum efficiency is 20% during cycling. During under water swimming it is just 4%.
 
Thanks, I was using rev/s instead of rad/s
 
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