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How to calculate Torque for motor?

  1. Dec 25, 2012 #1
    Hi,
    I am doing a self-balancing skateboard. It uses two 24v motor to move two wheels.
    I need to know if my motor will be able to move the wheels.

    Given that,
    wheel of 5.66 inches.
    The total weight of the skateboard = 13kg.
    Assume human mass = 80kg.
    Total weight with human mass = 93kg.

    How to know the torque to move each wheel?

    Thanks!
     
  2. jcsd
  3. Dec 25, 2012 #2

    mfb

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    Can you provide a sketch of the setup? Something similar to a segway?
    Where do you expect torque? If I understand your setup correctly, it depends on the maximal imbalance you get.

    In any way, you can estimate the order of magnitude (but not a precise value) with (wheel radius)*(mass)*(gravitational acceleration).
     
  4. Dec 25, 2012 #3
    Almost similar to segway only that this project uses hand controller.

    I don't have sketch of the setup. But if you look at this video , I think you can see the setup of the motor to the wheel.

    I only need to know how much torque is needed for the motor to move the wheel.
     
    Last edited by a moderator: Sep 25, 2014
  5. Dec 25, 2012 #4

    mfb

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    I see three reasons to need torque:
    - balancing. Depends on the quality of your balancing. Better (quicker, finer) -> less torque
    - acceleration. Accelerating 93kg with 1m/s^2 needs 93N, for example, divide that by your wheel radius to get torque for both wheels together.
    - angular acceleration. I would expect that this is negligible.
     
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