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Re: [PSUBS-MAILIST] motor seals
Jon,
This is true. With the exception that you can not load some motors
with large forces trying to push or pull on the shaft. This would require
a thrust bearing. Check out my post on using a tubular geometry to house
the magnets. A metal "Cup" could be placed around an acrylic tube. The
cup could be attched to drive the prop. This configuration would place no
such load on the motor allowing many different types to be used. The Cup
can have two or more magnets inside and it can be metal since it rotates
with the inside rotating system of magnets. Ideally the cup could have
blades radiating out used more as a fan than a conventional propeller. The
problem here is building the fan which is beyond the scope of most, me
included. I think it could be easily adapted to a standard propeller however.
GB
At 07:04 AM 8/16/00 , you wrote:
>On Wed, 16 Aug 2000 08:54:19 -0700, "Gary R. Boucher" <protek@shreve.net>
>wrote:
>
> > The trolling motor shaft has a seal but it would not be necessary in
> > this system. The trolling motor would have on its shaft two magnets
> > mounted say one to three inches from the center of rotation, sort of
> like a
> > "T" with the magnets on the ends of the top of the "T" if that makes
> > sense.
>
>Note also that if you decide to go with a magnetic coupling, you are no
>longer stuck with using trolling motors. You can use pretty much any kind
>of motor you want... Of course, you'll have to do something for a
>propeller, but it shouldn't be too hard to find or make one.
>
>Later,
>Jon
>
>--------------------------------------------------------------
> Jon Hylands Jon@huv.com http://www.huv.com/jon
>
> Project: Micro Seeker (Micro Autonomous Underwater Vehicle)
> http://www.huv.com