Calculate torque of a motor from straight bar load cell

In summary, the conversation discusses a motor that is powered and stalled against a wall, exerting its stall-torque. The motor is attached to a strain gauge as a cantilever beam, with the gauge being calibrated at a distance D from the motor's axis. The conversation also includes questions about the position of point D on the diagram and its distance from the motor's axis.
  • #1
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TL;DR Summary
I have a motor sitting on a calibrated bar strain gauge. The shaft of radius R is grounded to a wall. When the motor spins, a force F is measured on the strain gauge. The motor body is coupled to a square body with sides of length 4R

How do I calculate the torque of the motor?
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  • #2
PaulB said:
When the motor spins...
I assume there is a slipping clutch somewhere?
 
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  • #3
What is the strain gauge attached to, apart from the body of the motor?
 
  • #4
Yes, it is attached as a cantilever beam, a distance D away. The strain gauge has been calibrated in this position, so we can ignore the moment caused by D.
 
  • #5
Swamp Thing said:
I assume there is a slipping clutch somewhere?
Or is this the starting torque of a stalled motor?
 
  • #6
sophiecentaur said:
Or is this the starting torque of a stalled motor?
Starting torque of a stalled motor.
 
  • #7
PaulB said:
Starting torque of a stalled motor.
The summary tells us the motor spins.(?)
 
  • #8
sophiecentaur said:
The summary tells us the motor spins.(?)
Correction: the motor is powered, but stalled against the wall exerting its stall-torque.
 
  • #9
PaulB said:
Yes, it is attached as a cantilever beam, a distance D away. The strain gauge has been calibrated in this position, so we can ignore the moment caused by D.
We are not mind readers. Where is the point D on the diagram ?
How far is D from the axis of the motor ?
 

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