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• # Calculate motor torque requide to drive a cart

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

1. ### UdayaNew Member

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Sep 2014
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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
Required speed of cart -0.8m/s

Thank you.
Udaya.

2.
3. ### ErichWell-Known Member

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Feb 2012
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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. ### UdayaNew Member

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Sep 2014
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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.Well-Known Member

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May 2014
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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. ### oreng78Member

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Apr 2014
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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.

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