I am working on a 500 kg roller, which I want to pull using electric motor. I am considering hub motor, since it is easier to frame a basic ev with it. Now I need to know the capacity of the hub motor, I need to choose.

Roller weight = 500 kg Frame weight + driver weight = 150 kg speed required = 10 km/hr Surface on which the roller is to run is predominantly flat.

Things I need to know, 1. Torque requirement for my problem. 2. motor wattage 3. battery requirement, to run for 2 hours.

Being new to such design projects, I may have missed details. Please ask me for them. Help me with the calculation.

  • $\begingroup$ friction is unknown, so solution is unknown. Can you not compute the power to carry 650kg up a 1 deg incline at 10 kph? at what acceleration rate? $\endgroup$ Apr 22 '19 at 20:58
  • $\begingroup$ The closest coefficient of friction, I am able to find is; 0.04 - 0.08 car tire on solid sand, gravel loose worn, soil medium hard I took this from; Rolling Resistance Rolling friction and rolling resistance www.engineeringtoolbox.com Fr = c * mass * acc. due to gravity Fr=0.08 * 650 * 9.81 = 510.12 N But we are already talking in terms of weight, so are we already done with our m.g calculation, so is my 650 kg already W, so Fr = 0.08 * 650 ? If so, Fr = 52 N The surface I am going to roll the roller on is a play ground with grass grown on a field level hardened soil. $\endgroup$
    – Balaji S
    Apr 25 '19 at 3:16

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