Torque measurement
Torque measurement
(OP)
Hi,
I am using the feedback values of power and speed from my VSD to calculate torque from the relationship P=Tw. I don't see the need to buy a strain gauge because the torque obtained mathematically from this equation is a direct measure of the output torque.
Am I missing something?
Guardiano
I am using the feedback values of power and speed from my VSD to calculate torque from the relationship P=Tw. I don't see the need to buy a strain gauge because the torque obtained mathematically from this equation is a direct measure of the output torque.
Am I missing something?
Guardiano





RE: Torque measurement
You should be aware of the losses in the motor. If P is input power to the motor, you will have an inaccuracy that you may need to compensate for.
Most VFDs have a calculated torque variable available in the system. Have you looked for that?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque measurement
Guardiano
RE: Torque measurement
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque measurement
Guardiano
RE: Torque measurement
Planetaries are fairly efficient. You can count on at least 90% efficiency per mesh.
For your torque measurement be aware that during acceleration the amperage will be higher (your output torque will be less than calculated).