Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: tjump on December 06, 2008, 01:10:49 PM
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Okay, I've been through the calculations several times as have my students; and we keep coming up with the same answer. I am sending this out to the group to see if we are misinterpreting anything on use of the SoR motor calculator.
Our goal: select the correct motors for our robot.
Our criteria: based on the input parameters on the SoR motor calculator.
Mass = 6 lbs.
Desired Velocity = 9 in/s (0.75 ft/s)
Desired Acceleration = 0.4 ft/s^2
Expected Efficiency = 60% (treaded robot, rough terrain)
Incline Angle = 60 (extreme part of course)
Wheel Diameter = 2.5" (0.21 feet)
Powered Wheels = 2
We also specify a motor output rpm of 90. With this we get a required RMF that is pretty intense; so I'm hoping to get some feedback on what the group comes up with, or if I'm missing something.
I would appreciate any comparative data.
Cheers,
T. Jump
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Everythig seems fine, you get that huge RMF because of the high incline angle. Discard the incline angle (set to 0) and see the new RMF. Then, raise the angle slowly until you get some RMF in the ballpark you would like. Add 2 more motors to the setup, then another 2. You can allways use chain and sprockets to tie more motors to the driving shaft.