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  • Calculate motor torque requide to drive a cart

    Discussion in 'Calculations' started by Udaya, Sep 23, 2014.

    1. Udaya

      Udaya New Member

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      Hello,
      I'm in a design project of a cart. i want to decide a geared motor power and RPM. but I'm in a trouble with this because I'm unable to calculate the motor with radial friction.the cart is with steel wheel and drive on steel rails. place help.

      Total weight cart+carrying material - 4.5 Ton
      Radius of wheel - 80mm
      Required speed of cart -0.8m/s

      Thank you.
      Udaya.
       
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    3. Erich

      Erich Well-Known Member

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      Search the web on "steel wheel rolling resistance"

      Calculate torque required to accelerate the cart.

      Make estimates on inefficiencies in gear boxes.

      These should point you in a productive direction. The rest of the project is up to you.
       
    4. Udaya

      Udaya New Member

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      Hello Erich,

      Thank you very much for the reply. I want know when calculating the power of motor it must contain both force acceleration force + force again friction or any other method. I have argue in calculation force again the friction. in this case if i want to use normal rolling friction or is there any other value for static rolling friction?

      BR,
      Udaya.
       
    5. K.I.S.S.

      K.I.S.S. Well-Known Member

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      Static rolling friction? Is that the equivalent of a skid when the brakes are fully applied? That's a new one... Try to ask the most accurate question you can to facilitate an accurate answer.
       
    6. oreng78

      oreng78 Member

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      Here's something to start with:
      http://industrial.panasonic.com/ww/..._e/fa_pro_sgeard_shing1_e/ctlg_geared_e_9.pdf

      Regarding friction, assume that the wheels move without slipping on the rail (i.e. perfect rolling) - this is what will happen in the actual world if the moment and the acceleration are chosen correctly. choose motor torque assuming perfect rolling and choose acceleration empirically - that's the best practice. remember that when you calculate the acceleration you need take a safety margin that will allow you to have less acceleration in the real world and still get your cargo moving within the time boundaries required in the system.
       
    7. romanyattaalla

      romanyattaalla New Member

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      solve


      motor power = Torque * angular velocity
      P = T * W = F R 2 PI RPM/60
       

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