So I am building a wheeled project, and need to find out the torque and power I require from my motors.
The total project weight is about 40kg. I looked online, and found the following formula for torque: T = f x r
Using that, with a wheel diameter of 10" I get 50Nm (400*0.127). The question I have is, how do I calculate friction?
Can I just add some extra torque to compensate for friction? For example, lets say rather than 50Nm of torque, I need 75Nm instead?
The project will be run indoors on smooth surfaces. Acceleration and Top Speed values are not an issue.
Also, with regards to the power of the motor, I got 50Nm = 50W, so I would need at least 75W per motor including friction?
For reference, I was thinking of using a motor like this: http://www.alibaba.com/product-detail/brushless-dc-motor-42DMW81-2440-8poles_60417116842.html?spm=a2700.7724838.0.0.UngtTT&s=p and then adding gearing onto it to achieve my torque values.
Can someone please confirm my calculations are correct?