Alt-BEAM Archive
Message #07273
To: beam@sgiblab.sgi.com
From: Senior kyled@cruzers.com
Date: Mon, 01 Nov 1999 21:05:43 -0700
Subject: [alt-beam] Re: aquabots - 'sealed' motor
Oh right right sorry! I was a bit off :)
Wilf Rigter wrote:
>
> Of course a vacuum has the lowest density of all and would be very buoyant
> but incandescent lighbulbs are usually filled with a gas mixture.
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> tel: (604)590-7493
> fax: (604)590-3411
>
> > -----Original Message-----
> > From: Senior [SMTP:kyled@cruzers.com]
> > Sent: Monday, November 01, 1999 6:31 PM
> > To: beam@sgiblab.sgi.com
> > Subject: Re: aquabots - 'sealed' motor
> >
> > Well the problem with light bulbs are that there's a vacuum inside, so
> > I don't think yell be getting much bouynacy out of them but I could be
> > wrong!
> >
> > Jacob Booth wrote:
> > >
> > > 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
7274 Tue, 02 Nov 1999 16:14:16 +1100 [alt-beam] Re: aquabots - 'sealed' motor "Timothy Flytcher" Jacob Booth At 03:39 PM 11/2/99 +1000, you wrote:
>
>
>Jacob, great info on your aquarium pump!
>Why do you think that you can not wind an efficient armature??? production
>motors are machine wound... which means that a loss is exceptable to make
>them cheaper to mass-produce ... Yes! I have seen hand wound prototypes
>that
>are way more efficient then their machine wound end products!!! just go for
>it!
>
The problem is a lack of education in this respect; as in I don't know the
'gauge of wire vs turns vs voltage vs current vs torque vs speed' bits of
the motor building trade. My way would only be...'wind it up and see' :)
Who knows, one day I might prove the theorists wrong... the one thing I
learnt in physics is the only universal rule is that there are exceptions
to the rule. Gee it would be nice to accidentally discover the exception :)
------------------------------------------------------------------
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
7275 Tue, 2 Nov 1999 00:45:16 EST [alt-beam] Re: aquabots - 'sealed' motor beam@sgiblab.sgi.com JVernonM@aol.com In a message dated 11/1/99 11:10:56 PM Eastern Standard Time,
j.booth@mary.acu.edu.au writes:
> PS I think that aquabots are replacing my dream of 'aerobots' (or whatever
> you want to call them) as they still move in 3 dimensions, but things
> happen at a more leisurely pace, and the ground isn't so hard. Plus... they
> are much easier to keep 'up' above the ground, as you aren't usually
> wasting energy to do so. Hmmm maybe that is why life originated in water
Oh yeah baby, YEAH!
See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html
7276 Tue, 02 Nov 1999 19:12:52 +1100 [alt-beam] Re: Stray thought... beam@sgiblab.sgi.com robmc@acay.com.au > how does H2O know to weave
> those beautiful snowflake patterns without a micro? Wilf.
What a gem.
Rob
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