Actualy torque is 3.5-15Nm. At 15Nm it is stalled. It's a windscreen wiper motor. What do you say about this calculation:

OK, if 3.5 Nm is the rated working torque you get 9.5 kgf with the 5 cm wheels and 3 times upwards gearing.

**I'm trying to find the torque required of an electric vehicle to pull a 1000kg trolley on four Nylon Wheels on smooth concrete. The trolley fully supports its own weight. The vehicle has 2 rubber drive wheels of Radius( r = .125m). Now I'm not sure if am on the right track because i cant find much information on Rolling resistance.**

A good starting point would be to calculate the needed force assuming zero rolling resistance. It's easily factored in afterwards anyway.

But, you need to have the total weight (vehicle+trolley+loads), the wheel size and the

**needed minimum speed** in the calculation.

Occasional sanity checks are a good way of assuring you're not going into long chains of calculations on bad data or formulas.

Like 1 ton + whatever - that's around the weight of a car.

1hp=~775W, what hp's do you estimate is needed to make a small car move at the speed you have in mind(?)

Using [...]

This should give me the minimum required torque to get the trolley and vehicle rolling on a smooth horizontal surface. Yes/No?[/b]

No (and please, a little less bold face).

In you calculation, the rolling resistance means you need less force?? (Sanity check time)

And why include gravitational acceleration?

I found this on physics forum. Only problem i found in this extremly small dinamical friction coefficient of wheel itself with axle of only 0.004. But if you look again it is added to friction force of wheel to ground.

Is it?