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Thread: Torque required to move a wheeled weight

  1. #1
    Associate Engineer
    Join Date
    Mar 2018
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    2

    Post Torque required to move a wheeled weight

    I have a problem where I have a large mass on wheels that I want to power with an electric motor. My hope is that I can find the torque i need to start and drive the motor and this is what I have so far.

    Mass = 400t.
    Initial velocity = 0
    Final velocity = 2.5m/s
    Distance required to travel = 101m

    I used acceleration = (Vf^2 - Vi^2)/2*D for the acceleration but i don't think that is right because does that mean I am wanting it to reach full velocity at the 101 metre mare with that equation?

    Once i find the acceleration, my plan is to use F=Ma to find what I think will be the force to overcome being stationary, and knowing I have two 600mm diameter wheels being driven, is the torque just half the force multiplied by the wheel radius?

    Any input would be great thanks as I need some guidance.

    Thank you.

  2. #2
    Principle Engineer Cragyon's Avatar
    Join Date
    Feb 2013
    Location
    Newark, NJ
    Posts
    187
    You need to calculate the moment of inertia for the mass to determine the required torque. The required torque will also depend on the driving wheel diameter, torque friction and a reasonable factor of safety.

    Acceleration torque:

    Ta = J x A

    Ta = torque, J Moment of inertia and A = acceleration rate

    More detail:

    Ta = [ ( Jo x i^2 + JL) / 9.55 ] x Nm / t1

    Jo = Motor inertia
    JL = Total Load Inertia
    Nm = Operating speed (r/min)
    t1 = Accelereation (deceleration) time (s)
    i = gear ratio

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