Alt-BEAM Archive
Message #04455
To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Fri, 11 Jun 1999 23:33:59 -0500
Subject: [alt-beam] Re: SERVO FIXED thanx to you guys
A motor acts like a generator if you turn it. You don't get current for
free, and the more current a circuit draws, the harder it is to turn the
motor. A short circuit has the highest possible current for any given
circuit, so the motor turns hard. The faster you turn, the more current,
the harder you turn. Also, the short would short the circuit driving it
as well.
Glad you found the problem!
SG wrote:
>
> yup went to bed last night cursin and even kicked the cat...
> (ok, ok, yur right, i kick the cat every nite.)
> sombody, don't know who, I deleated the message, mentioned that when the
> leads to the servo's motor are crossed the tension increases. Now I know
> my wiring was good and my h-bridge was good, soo i looked at the motor
> itself and there it was.
> (dramitic pause)
> solder had from one lead was touching a little metal band that incircles
> the small protrusion on the back of the motor. this little band is
> connected to the other lead.
> i quickly grabbed the "desoldering braid" (which by the way stock in the
> company that makes this will go up do the fact that i am using so much of
> it to correct my mistakes, so invest now) and walla the motor turns with
> little resistance and werks with electric current. funny it would lock up
> with no power... must be a magnetic thang.
> now if ican jsut fix it so it turns more than just 180 degrees...
>
> HA! thought i was serious din'tcha!
> Thanx fer the help, didn't wanna spend anuther $10 bucks
>
> -Sparky
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
For the BEAM Robotics list:
BEAM Robotics Tek FAQ
http://people.ne.mediaone.net/bushbo/beam/FAQ.html
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