Calculation of torque, momentum

[johnaguiar]

Hi,
good afternoon

the problem is this: This device was assembled with the purpose of calculating the torque of a small motor. It measures the force F through a charge cell. The calculations performed for the moment were made using the data provided by the load cell and distance "d". However, the torque of an engine is traditionally calculated as the force established between the motor shaft and a load cell, as would be the case with the distance "d1". I would just like to know if the two moments are the same.

 

[A.T.]

I would just like to know if the two moments are the same.

Did you look at the definition of a moment? When the force is the same, but the lever arms are different, can the moments be equal?

 

[johnaguiar]

Did you look at the definition of a moment? When the force is the same, but the lever arms are different, can the moments be equal?

Yes i know the definition. The problem is that also the force on the load cell would be different on the two cases.

 

[A.T.]

Yes i know the definition. The problem is that also the force on the load cell would be different on the two cases.

What two cases? You posted only one crude diagram, and didn't even mark the motor.

 

[jack action]

If I understood your drawing correctly, the torque is the same no matter where you measure it.

If you take a motor casing and its shaft, the torque is the same from the point of view of the casing or the shaft (one reacting to the other). If the casing is attached to a plate supporting it (like it seems to be in your drawing), you are just extending the casing. The reaction force will be smaller because of the larger 'casing', but that is just because the torque is the same.

 

[CWatters]

The calculations performed for the moment were made using the data provided by the load cell and distance "d"

That's correct.

Is there a brake on the flywheel or are you just interested in the torque while the flywheel is accelerating?