Subject:
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Re: Newbie needs Help (diff sensor)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 7 Jun 2006 08:16:50 GMT
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Original-From:
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Mr S <szinn_the1@yahoo.comAVOIDSPAM>
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Viewed:
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4019 times
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Philo,
That's interesting, and looks to explain why it is that I've
never been able to observe the RCX output going to thermal
or current protection cutoff?
I've one largish sumo type bulldozer style robot with 4 treads
that can easily push 4-5 times its own weight. I played with it
trying to see what happens when it hits that immovable object
and have never seen the outputs go into cutoff, or failure, though
I did push them to stall conditions with two motors on each. I
half expected to see smoke, but nope, just no go, and immediate
recovery. It pushes far enough to break chains and twist things
up, but I've never seen the outputs cutout as it is rumored they
will.
On a side note, your work on testing the motorcycle tires for
traction is of interest to me, and I never got around to asking,
but on a side note here, when you tested this tire
<http://philohome.com/traction/2903.jpg> do you think that the
performace would be improved if the tire were filled with a kind
of PFE tubing (so as to make it a run flat kind of tire) so that it
did not suffer from excessive compression of the rubber tire?
----- Original Message ----
From: Philippe Hurbain <philohome@free.fr>
To: lego-robotics@crynwr.com
Sent: Wednesday, June 7, 2006 1:39:50 AM
Subject: Re: Newbie needs Help (diff sensor)
In lugnet.robotics, Mr S <szinn_the1@yahoo.com> wrote:
> The RCX does
> not supply enought current to handle a stall condition of two motors on one
> port. RCX output =~ 500 ma Motor stall current =~ 350+ ma
Actually it does - barely. With the increased current, RCX output voltage drops,
so does motor stall current.
See these compared charts:
<<http://philohome.com/motors/mechpwr-rcx-2x71427.gif>>
<<http://philohome.com/motors/mechpwr-rcx-71427.gif>>
Philo
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Message has 2 Replies:
 | | Re: Newbie needs Help (diff sensor)
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| (...) It does happen - if you use more that 2 motors or if you try to use a RC motor. The driver circuit limits current around 500mA, and at that rate it is not long before going in thermal shutdown mode. (...) No, you won't see smoke... RCX motor (...) (18 years ago, 7-Jun-06, to lugnet.robotics)
| | | Re: Newbie needs Help (diff sensor)
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| (...) I would have expected that compression would be a good thing because it would increase the area of the 'contact patch' - which increases traction - which is a good thing - right? (18 years ago, 7-Jun-06, to lugnet.robotics)
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