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Thanks, I thought I was wrong because the numbers were very low.The thing is, there are these electric motors which cost 50 euros, and they suck, with 270 N mm (0.2 lb ft) and 30000 rpm,they can't even nearly power a robot of 25 kg with a normal speed, according to the RMF calculator.I just thought this hard to believe,
(claiming they are for the big RC bots) are 25 kg/cm, 0.25 kg/m.. this results in an RMF of about
25kg-cm is heaps. With one motor and a 1cm radius wheel, you could drive your 25kg robot up a vertical slope
Quote25kg-cm is heaps. With one motor and a 1cm radius wheel, you could drive your 25kg robot up a vertical slopeehhhh two problems . . .1cm radius wheel, not much clearance with that . . .Also, it'd only hold the person with a 1 cm radius wheel if the person weighed 25kg or less (unless the slope is less than 20 degrees or so vertical)
So something like 200 rpm 6 KG/cm torque will be able to move a 25kg robot with (2/4 powered) 10cm wheels?I'm just confused because the calculator says absolutely not.
25 kg at about 2m/s, with 0.5m/s^2 acceleration
Well the requirements now are moving 25 kg at about 2m/s, with 0.5m/s^2 acceleration, 4 powered wheels of 15 cm, 75% efficiency and 10 degree angle.
I see now, I need to lower the weight anyway, because it would be too expensive if I need to buy some 100$ motors.The problem is, the motors I have available, are about 25 Kg/cm, so 0.25 Kg/m, and 300 rpm.That resulted in a RMF of 1.25, while i needed about 20.
For a robot that heavy, 2m/s is scary (unless its a battlebot, as scary is a good thing).
New specs are about 5 kg, moving at 2m/s (calculated with 0m/s^2), 4 powered wheels of 15 cm, 75 efficiency, 10 degree angle.motors specs of 0.25 kg/m and 300 rpm are good enough for now. We thought of buying a lead acid battery for the low costs, but I'm not sure if it's smart to do. So are we really doing something stupid here or is it ok?
calculated with 0m/s^2
We thought of buying a lead acid battery for the low costs, but I'm not sure if it's smart to do. So are we really doing something stupid here or is it ok?
Quotecalculated with 0m/s^2A robot that can't accelerate can't move We'll just kick it in the back , nah it can accelerate, not too fast, but we don't ask much of it,QuoteWe thought of buying a lead acid battery for the low costs, but I'm not sure if it's smart to do. So are we really doing something stupid here or is it ok?Don't confuse price with value per dollar. If the price is half, but the features are 1/4th, is it still worth buying?We need to know more about your requirements before we can tell you what battery is best. That said, for the small/slow robots I like to make, NiMH is definitely the best value per dollar spent.