Calculation of torque, momentum

AI Thread Summary
The discussion revolves around calculating torque for a small motor using a load cell. Participants debate whether torque measurements differ based on the distance from the motor shaft to the load cell. It is clarified that torque remains consistent regardless of measurement point, as long as the force is the same. The impact of the motor casing on torque calculations is also considered, noting that the reaction force may vary with the casing's size. The conversation concludes with a question about whether the torque measurement is taken during acceleration or with a brake on the flywheel.
johnaguiar
Messages
2
Reaction score
0
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.
 

Attachments

  • exemplo.png
    exemplo.png
    3.9 KB · Views: 531
Physics news on Phys.org
johnaguiar said:
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?
 
A.T. said:
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.
 
johnaguiar said:
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.
 
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.
 
johnaguiar said:
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?
 

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
View full post »

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
View full post »

Similar threads

B How to Calculate Power and Torque for a 15kg Load at 15 RPM?
Replies
7
Views
2K
Reaction torque in a traction system
Replies
10
Views
2K
B The physics of flywheel launchers (like tennis ball shooters)
2
Replies
60
Views
4K
I Conservation of angular momentum during collisions
Replies
3
Views
3K
Estimating Torque from Power over Time
Replies
2
Views
2K
How to calculate required torque for a robot arm
Replies
2
Views
4K
Torque calculation needed for unique application
Replies
8
Views
3K
A Modeling the damping of a physical rigid pendulum
Replies
1
Views
2K
Electric motor torque control based on speed interaction/instability
Replies
3
Views
2K
Calculating Torque for Rotating Disk: Specs, Friction, and Weight Considerations
Replies
1
Views
4K

Hot Threads

Recent Insights

Back
Top