Alt-BEAM Archive

Message #07251



To: beam@sgiblab.sgi.com
From: JVernonM@aol.com
Date: Mon, 1 Nov 1999 21:02:01 EST
Subject: [alt-beam] Re: solar cell hunt


In a message dated 11/1/99 7:55:29 PM Eastern Standard Time,
gpowell@engr.uvic.ca writes:

>
> I am not sure if the ones I am thinking of are the same but Electronic
> Goldmine had some semicircle cells on page 83 of their cataloque:
>
Thanks Greg, I'm still not sure those are the same ones but they sure are
close. 6 of those suckers hooked in series would be a nice little power house.

See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html



7252 Tue, 02 Nov 1999 13:14:01 +1100 [alt-beam] aquabots - 'sealed' motor beam@sgiblab.sgi.com Jacob Booth I have a filter pump for my aquarium which has the coils in a sealed
plastic ring or tub. The armature is a multi-poled magnet also sealed in
plastic which 'floats' inside the plastic ring. I guess it works more like
a stepper motor (would need circuitry to do the job of the commutator) but
is perfectly watertight (well, close enough :). Another bonus is NO wear as
it uses no bearings. The combination of magnetic field and moving water
enables the armature (should this be just called a rotor?) to 'float'
inside the ring and rotate. It is designed to be fully submerged. I am
thinking of doing something like this as a proof of theory for a waterproof
motor for myself. I doubt anything home made would be very efficient at all
though. Does efficient matter when we have other things like water friction
to worry about? :)

warning: bad ascii image below:

-- || -- A: multi-poled rotor
|| ---- || B: sealed coil assembly
|| | A| || x: water filled void
|| |__| ||
||___x__||
|____B___|

picture a film canister sized water filled void, and the rotor as the roll
of film size. I want to make a small one!

Oh, and another thought... what about using a small light bulb for a
buoyancy device? would it make any difference on its own when turned on (eg
heat up the low pressure gas inside the bulb) compared to off? A bit power
hungry, but a different idea! Maybe if the gas space in the bulb is too
small it could be used to heat up a larger container of air for example.
Would it be better to expose the bulb outside the bot, or have it inside
the sealed airspace inside the bot? Anyone thought about this before or
tried it? let me know!

Cheers
Jacob
------------------------------------------------------------------
Jacob Booth BIS, MCP Web http://www.its.mary.acu.edu.au/
IT Services Email j.booth@mary.acu.edu.au
Phone (02) 97392235 Fax (02) 97392924



7253 Mon, 1 Nov 1999 08:07:24 -0600 [alt-beam] Stray thought... "Phillip A. Ryals" I've been thinking about it for a while, and thought I'd post this to the
list. If anyone has any ideas, I'd be really happy to hear them.

I've been thinking about a bot that would move by hanging from a string or
wire strung between two points. I know the obvious lack of mobility would
keep it from being terribly useful, but I'm still trying to work it out.
Maybe an exercise in mechanics?

Anyway, I'm just lost on how to drive the legs. I thought about some kind
of rotary motion, like a wheel on top on the string, or legs attached to
motors that just spin.... but I think that'd just be boring.

So I'm looking for some way to make it "walk" along the string. Just like
you'd do with your hands if you're hanging like that.


Anyone?

par

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