The carriage's total weight is 5kg which includes 4 trolley wheels, 1 drive wheel, a battery, 100g load, its aluminum body, and an allowance of 300g motor weight. The linear movement will have no incline or decline.

If possible, we would like pitstops every 5 meters, that's in between hitting the switches.

We want to use between 5v and 12v power input. Battery operated, low power consumption is an important consideration and so I would really appreciate your guidance on this.

I have 2 main queries that I need help with.

1) based on the above variables, our calculation suggests that either NEMA 17 or DC motor with 0.42N.m is sufficient. Any thoughts?

2) Its one-speed movement, exactly the same load each time and stop do not have to be precisely accurate. If power consumption is an important factor, would you suggest a stepper (with gear) or a brushless DC (with encoder) motor? motor cost is not a major factor.

Thank you so much for your help.