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Thread: Motor torque

  1. #1
    Associate Engineer
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    Motor torque

    Hi there

    I need to calculate motor speed and reduction on a drive wheel.

    the wheel is 2" diameter and is pulling a wire that is pinched between it and another roller. I'll need 100lbs of pull on the wire. I'll need to pick a dc motor and reducer to get this and we already got it wrong once...

  2. #2
    Administrator Kelly Bramble's Avatar
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    Motor torque minimum = 100lbs x 2" = 200 lbs-in.

    With a 3:1 factor of safety you will need 600 lbs-in motor.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    Thanks. Will speed be a factor? Ill want to run that at 200 rpm.

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by shiloh View Post
    Thanks. Will speed be a factor? Ill want to run that at 200 rpm.
    Yes, you need motor that is torque rated at that rpm or gear it to perform optimally.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  5. #5
    Technical Fellow jboggs's Avatar
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    Quote Originally Posted by Kelly Bramble View Post
    Motor torque minimum = 100lbs x 2" = 200 lbs-in.

    With a 3:1 factor of safety you will need 600 lbs-in motor.
    Kelly,
    The wheel is 2" diameter. Wouldn't the moment arm be 1"? So the calculation is 100 lbs x 1" = 100 lbs-in?

  6. #6
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by jboggs View Post
    Kelly,
    The wheel is 2" diameter. Wouldn't the moment arm be 1"? So the calculation is 100 lbs x 1" = 100 lbs-in?
    Yes, you're right.. hope the op caught my mistake
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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