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I am doing a design project but i'm kinda stuck with choosing motors because i am not sure of the required torque. My project is a handicapped golf vehicle powered by 2 motors, so it would need to be able of climbing steep gradients.

I currently have an equation but I am not entirely sure if it's right.

It consist of :

1. Rolling resistance = (Gross Vehicle Mass) X (Co-efficient of Rolling Resistance)

2. Grade resistance = (Gross Vehicle Mass) X ( Sin(angle of max gradient) )

3. Acceleration force = (Gross Vehicle Mass/Gravity) X Acceleration

Adding all 3 up to give you Total Tractive Effort.

That's then used in the equation

Torque = (Friction factor for bearings and axles, etc.) X (Total Tractive Effort) X (Radius of drive wheel)

My question is, are these equations right or do I need to use more complicated equations dealing with moment of inertia, etc.

Thank you!