1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Measurement of power associated witha vertical shaft

  1. Sep 1, 2013 #1
    How can I measure the power associated with a vertical rotating shaft (similar to the shaft of a vertical axis wind turbine).
    power=Torque*angular velocity
    Angular velocity can be found by using tacho meter or spectroscope.. but i am confused how to measure the torque...
  2. jcsd
  3. Sep 1, 2013 #2
    The only correct answer is with difficulty. Also how much do you have to spend and how accurate do you need to be? You might do it directly by measuring the twist in the shaft, I've seen this done in two ways.
    A) You have two toothed wheels at either end of a torque tube by looking at the phase change of the waveform from magnetic pickups on each wheel you can calculate the twist of the tube.
    B) You have a scribed line on a torque tube, by looking at the line, under a strobe light so the line appears stationary, through a microscope with a suitable grid and thus measuring the twist.
    In both cases you need a calibrated torque tube.
    Depending on what you are driving you might be better calculating the power from the driven device.
  4. Sep 1, 2013 #3


    User Avatar

    Staff: Mentor

    Is there a load connected to it?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook