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
PaulB
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0
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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Likes sophiecentaur
  • #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 ?
 

1. What is torque and how is it related to a motor?

Torque is a measure of the rotational force applied to an object. In the context of a motor, it refers to the amount of force that the motor can generate to rotate an object. The strength of a motor's torque is directly related to its power and can be calculated using various methods, such as using a straight bar load cell.

2. How does a straight bar load cell measure torque?

A straight bar load cell is a type of sensor that measures force by detecting the strain or tension on a metal bar. By attaching the load cell to the motor, it can measure the amount of force being applied to the bar, which can then be used to calculate the torque of the motor.

3. What are the factors that affect the accuracy of torque measurement using a straight bar load cell?

There are several factors that can affect the accuracy of torque measurement using a straight bar load cell. These include the sensitivity and calibration of the load cell, the positioning and alignment of the load cell on the motor, and the consistency of the load being applied to the bar. It is important to carefully consider and control these factors in order to obtain accurate torque measurements.

4. Can a straight bar load cell be used for all types of motors?

Yes, a straight bar load cell can be used for most types of motors, including DC motors, AC motors, and servo motors. However, the load cell may need to be calibrated differently for different types of motors in order to accurately measure torque.

5. Is it necessary to measure torque using a straight bar load cell?

While there are other methods for measuring torque, such as using a dynamometer or calculating it based on motor specifications, using a straight bar load cell is a common and reliable method. It allows for real-time measurement of torque and can provide valuable data for motor performance analysis and optimization.

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