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What I'm trying to build is a robot for transporting beer kegs for my local student's pub, with three wheels and two engines. Here are the specifications:Est. weight loaded100 kgVelocity10 km/sVelocity166.67 cm/sAcceleration83.33 cm/s/s
Hi,Quote from: Cyntrox on July 29, 2012, 08:47:02 AMWhat I'm trying to build is a robot for transporting beer kegs for my local student's pub, with three wheels and two engines. Here are the specifications:Est. weight loaded100 kgVelocity10 km/sVelocity166.67 cm/sAcceleration83.33 cm/s/sYou might wanna rethink and recalculate the project a bit - Rocket motors may be a bit uncontrollable 10km/s = 36.000 km/h might be a bit unreachable (and bad for the beer).166.67 cm/s = ~6 km/h (brisk walking pace) is a more realistic goal, although it will still take some powerful motors.You might wanna cut back on the acceleration as well
Quotetwo enginesDo you mean internal combustion engines or DC electric motors?A widely available source of geared DC motors would be from electric wheel chairs. These would have the capability to move the Mass of a keg or two and at a controllable speed.Get some specs of what is used in wheel chairs and run them through the calculations.
A 350W DC brush motor will satisfy your needs. As a reference os weight and size, electric go karts use those ones.
That sounds like overkill. At 12v, it would draw almost 30A!
6 km/h would probably be enough for my needs, but I want to make sure that it doesn't fall short, especially as I'm not 100% sure of the weight it will need to carry, so I'm sticking with 10 km/h for now.
Amateur bicycle racers can typically produce 3 watts/kg for more than an hour (e.g., around 210 watts for a 70 kg rider)