Physics work

theripley

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Jul 2008
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Hi

I wanted to know if my calculation on power requirement is correct..

From the formula P=Tw, where P=power in kW, T=torque in Nm & w=angular velocity=(2*pi*rpm)/60.

Given, T=500Nm, rpm=6 (with gear of 300)
P = (500Nm*6rpm)/9549
= 0.31416 kW
 
Are you sizing a motor to drive the gearbox ?

You need to allow for the gearbox efficiency.

Yes, I am sizing my motor in line with my required torque & speed. I will try to search for the gearbox effciency you are referring to & try to add that to my calculation.

P.S.
As a thread, I have observed that decreasing the speed requirement, decreases the size of my motor.
 
P.S. As a thread, I have observed that decreasing the speed requirement, decreases the size of my motor.

That stands to reason. The energy to move a specific load a given distance is constant. However, the faster you move it the greater the power needed. Power is energy expended over time.
 

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