Alt-BEAM Archive
Message #10269
To: beam@sgiblab.sgi.com
From: TurtleTek@aol.com
Date: Tue, 15 Feb 2000 20:05:18 EST
Subject: [alt-beam] Re: UBB?
This thread is sounding very familar...
Oh, sheesh, not this again.
-Brien the TurtleTek
10270 Tue, 15 Feb 2000 20:16:00 EST [alt-beam] Geared Motors beam@sgiblab.sgi.com BUDSCOTT@aol.com I finally found myself a pair of geared motors. They were under my nose the
entire time, they are old display motors that my grandpa had for his store
back in the day. They only draw about 5 mA, is that nuts, am i going insane?
i checked like three times because i so surprised, it must be because they
had to stay running for long periods of time. Is it possible to have to high
of a gear ratio, these motors have such high torque from the incredible gear
ratio (unkown) that it is impossible to stop with my fingers, or this pliers!
they are a bit bulky but not to heavy, they are about 2 in. long by 1 3/4 in.
in diameter. they'll be huge, but they certainly have the torque from running
at about 4 RPM! (or so it says).
-Spencer
10271 Mon, 14 Feb 2000 11:58:51 -0500 Re: Solar cell Q William Cox
> So a cap can store MORE current than the cell supplies at one time and NO
> MORE voltage than the cell can supply at one time? Is that it?
> -William
>
> ----- Original Message -----
> From: Sathe Dilip
> To:
> Sent: Tuesday, February 15, 2000 10:28 AM
> Subject: Re: Solar cell Q
>
>
> > The capacitor we connect in parallel with the solar cell acts like a
> > current storage tank. You save enough current to last you for a small
> > burst of motor (run) power. The level of current stored in the tank is
> > indicated by the voltage on the capacitor. How much current you can
> > store is decided by the size/value/capacity of the capacitor.
> >
> > I don't know about the American curriculum but we used to have math
> > problems in school about a tank with a faucet filling it & another
> > emptying it. If you have done those, you will understand the above
> > analogy even better.
> >
> > Dilip
> > -------------------------
> >
> > William Cox wrote:
> > >
> > > Q: All the solar cells in Solarbotics catalog have a small current
> rating, I
> > > mean, that the current they supply is smaller than the motors draw
(30 -
> > > 45ma). How does this work? I've got the MPJA motors, and someone said
> that
> > > they draw about 45ma, what type of solar panel should I use? I'm using
a
> > > FLED, so I guess I'd need something with >2.4 or so volts. What about
> > > current? Right?
> > > -William
> > >
> > > ____________________________
> > > http://robot-central.webjump.com/
> > > Robotics books, projects, resources,
> > > links, news, and more!
> >
> > --
> > ----------------------------------------------------------------------
> > The early bird may get the worm, but the second mouse gets the cheese.
> > ----------------------------------------------------------------------
> >
>
>
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