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November 2014

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Subject:
From:
Frank Levine <[log in to unmask]>
Reply To:
Frank Levine <[log in to unmask]>
Date:
Fri, 7 Nov 2014 11:39:02 -0500
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Are they running the motor into a hard-stop?  Our team does this too, but
we use a timer to exit the loop after we know that it has reset to the
correct position.  It sounds like your motor is malfunctioning... do you
have a spare?

-Frank


On Fri, Nov 7, 2014 at 9:59 AM, Greg Trafton <[log in to unmask]>
wrote:

> Hi, all.  Our team has been having a great time with the missions this
> year.  They have been using the medium (rotary) motor for a couple of
> missions, but it has been mis-behaving and I'm looking for suggestions.
> Here is the behavior:
>
> 1) The kids put an arm on it and move it to the correct position
> (backdriving the motor).
>
> 2) They reset the motor in code before it is used.
>
> 3) Sometimes (20%?) the rotary motor spins like crazy over and over
> causing a failed mission and stop mission penalty.
>
> The only fix the kids have found for this has been to unplug and then plug
> in the motor from the EV3 controller before the mission, but that takes
> time and sometimes doesn't work either.
>
> My guess is that backdriving the motor at the beginning is the source of
> the problem, but there is no way NOT to do that at least a little.
>
> Earlier in the season the kids tried changing ports (no luck) and wires
> (no luck).  We haven't changed motors because we don't have a spare.
>
> Has anyone else had this same problem?  Any possible fixes?  Bad motor or
> something else?
>
> Thanks for any suggestions!
> greg
>
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