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motors in robotics

Discussion in 'Electronic Basics' started by lerameur, Oct 2, 2006.

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  1. lerameur

    lerameur Guest


    I am not sure if its the right place for this but here goes. I am
    constructing a line following robot. it is going to ba a wooden
    platform 2x3 feet. I will be putting around 60lbs on it. Is there an
    equation that will guide me to the right specification of a motor, (in
    watt). I bought these geared motors:
    but the motor turn bery slowly and I afraid they will heat up in time.
    Plus the gearhead of one of the motors just stripped.
    Is there a weight to motor power conversion ?
    I guess the motors I have, ran at 24 v max, with a calculated 0.2 amp
    max, so 4.8 watt?
    Also those geared motors are hard to find, i did not want to go into
    the trouble building my own gears, it probably would not be as precise
    and strong.


    ken O
  2. BobG

    BobG Guest

    I go to skycraft every Saturday. Cool place. Get a spring scale and see
    how many pounds it takes to pull the thing. Lets say 10 lbs. Now decide
    how fast you want it to go. Lets say 10 ft/sec. So thats 100 ftlbs/sec.
    A HP is 550ftlbs/sec, so you need one fifth of that...A HP is 746
    watts... 746/5 is about 125 watts... 12V 10A or 24V 5A about. You can
    compute rpm needed at the wheel if you know wheel diam. And torque
    needed at the wheel.

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  4. Guest

    That's interesting, you make it sound simple. I wonder if it is
    (simple) <g>

    You mention torque and wheel diameter ... do those affect the selection
    of motor size as well, or are they independent?

    And I have a second question, about braking. Our robotics team uses
    Victor speed controllers with a jumper that provides motor braking by
    shorting the motor terminals. But given the momentum of the robot, it
    still doesn't stop right away.

    I know if we put the motors into reverse, it stops very suddenly but
    puts great stress (and I imagine, current load) on the motors. If
    instead we were to arrange to 'pulse' the speed controllers between
    neutral(braking) and slightly reverse, would we be able to stop sooner
    without tearing the motor out of the robot, overheating the Victors and
    blowing breakers, or both?
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