Subject:
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Re: How many motors can accept a RCX ?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Jan 2001 12:28:28 GMT
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Reply-To:
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Dave Ryder (NS) <daver@ansuz%NoSpam%.nospam.demon.co.uk>
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Viewed:
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722 times
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Alexandre,
My guess would be that the the Motor killed the RCX, It seems to be that the
newer Technic motors (i.e. Mindstorms motors) often exibit this failure
mode. I have had three go this way, and I have heard reports of other people
who have had as many as 7!
They can either just get a little sticky or sieze up completely, one of mine
would only turn if I used pliers on it, and believe that it would of easily
sunk more than 500mA.
Regards, Dave.
--
----------------------------------------------------------
Twisted is as Twisted does.
Tim Hatch wrote in message <001b01c0873a$24a63860$38d97881@nt87636>...
> The outputs on the RCX can sink about 500mA of current, and each motor • draws
> up to 200mA when stalled. You can put two on the output and stall them
> before the thermal shutoff kicks in. I was under the impression (never
> tried it, mind you) that the thermal thing could cool off (a few minutes)
> then would work fine.
>
> Tim
>
> ----- Original Message -----
> From: Alexandre Bec <laleks@free.fr>
> To: <lugnet.robotics.rcx@lugnet.com>
> Sent: Thursday, January 25, 2001 6:19 PM
> Subject: How many motors can accept a RCX ?
>
>
> > Hi, everybody
> >
> > <DISCLAIMER>
> > Excuse me first for my newbieness here on Lugnet.
> > and also for my frenchieness, but it's not my fault !
> > </DISCLAIMER>
> >
> > I have a question I'd like to submit:
> >
> > Because of extreme needs of power/ acceleration (it was about controling • an
> > inverted pendulum) , I had the idea to plug 4 motors on my RCX.
> > I tried 2x2 on A and C, and all was working great, my bot was a bit more
> > reactive, despite the fact that batteries were sucked sooner.
> > But after some more tests, my RCX wasn't responding anymore, definitely, • as
> > if it had been blowed up. I saw later that one of the extra motors was • very hard
> > to turn with the fingers (but I did never tried this before the • crash...).
> >
> > Since Lego sent me a brand new RCX (and my despair is gone away) I wonder
> > now if this breakdown is due to an excessive load on the RCX who has thus
> > damaged the motor (so that I'll never plug more than 3 motors on the same
> > RCX, I sware) or if this breakdown is due to a faulty motor who has • caused
> > an excessive load on the RCX.(so that I just have to take a good motor • and
> > go on).
> > It's something like the myth of chickens and eggs, isn't it ?
> > And that's why I need the opinion of the MindStorms gurus.
> >
> > Thanks a lot
> >
> > --
> > Alexandre BEC
> > laleks@free.fr
> > --
> > mille excuses pour l'absence d'accents dans mes correspondances,
> > du fait de mon qwerty marseillais...
> > ....mais c'est tellement mieux par ailleurs...!
> >
> >
>
>
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Message is in Reply To:
 | | Re: How many motors can accept a RCX ?
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| The outputs on the RCX can sink about 500mA of current, and each motor draws up to 200mA when stalled. You can put two on the output and stall them before the thermal shutoff kicks in. I was under the impression (never tried it, mind you) that the (...) (24 years ago, 26-Jan-01, to lugnet.robotics)
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