Can a Tachometer Measure the Torque of a Rotating Disc?

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SUMMARY

The discussion centers on using a tachometer to measure the rotational speed of a disc connected to a gearbox and AC motor in order to calculate torque. The user intends to apply the formula T = I x α, where T is torque, I is moment of inertia, and α is angular acceleration. Recommendations include reducing the sampling interval from 10 seconds to 1 second or faster, ideally at 10 Hz or higher, to improve the accuracy of torque calculations. The consensus emphasizes that without proper instrumentation, achieving reliable torque measurements will be challenging.

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  • Understanding of angular acceleration and moment of inertia
  • Familiarity with tachometers and their operation
  • Basic knowledge of torque calculations
  • Experience with sampling rates and data acquisition
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nicole2000
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Hello All!

I have one machine. The disc (Horizontal place) is rotating and connecting to the shaft which is connecting to gear box and ac motor.

I would like to k now the torque of rotating disc for some interval such as 10s, 20s, 30s, to take reading , but I do not have money to buy torque meter.


I would like to know can I use tachometer to take the rotation speed of rotating disc within interval, 10s per taking.
And then I can use T= I x aplha to find the different time's torque reading

Please advise me.
Or could you please give me another ideas or suggestions?
Thanks a lot.
 
Last edited:
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That's an extremely rough way to do it. If you were to go that route, I would recommend that you reduce that 10 sec interval to less than a second. If you can sample the speed quicker, say 10 Hz or better, you will have a better resultant calculation of the torque, especially if you are trying to see the result of an applied load.

Without proper instrumentation, I don't see how you're going to get any better results that easily.
 

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