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Thread: How to calculate a required torque of the motor

  1. #1
    Associate Engineer
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    Aug 2012
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    How to calculate a required torque of the motor

    Hi Guys,
    I am trying to calculate a required torque of the air motor powering the drum. The motor has to overcome 3000N resistance (tension) of the drum before it starts moving. The speed of the drum will be 6 RPM. Sprocket ratio is 6:1

    My simple calculation would be

    T=F*r (force * radius of the drum) so that would come up to 1800 Nm of torque. Now should I multiply those 1800Nm by 6 (ratio of the sprocket)?
    See the attached picture.
    Thanks
    Attached Images Attached Images

  2. #2
    Administrator Kelly Bramble's Avatar
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    Welcome to Engineers Edge!

    See:

    Two Pulleys Engineering and Design Calculations
    Last edited by Kelly Bramble; 02-07-2013 at 07:42 PM.

  3. #3
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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