Hi Ron,
Just some more thoughts on the running brushes in liquid.
I know they run them in gasoline. However there might be a problem running
them in oil.
When I worked for HP in the Reliability Physics Lab, I learned that a coat
of oil or grease on electrical things would stop corrosion dead. This is
mostly because air can't get to the metals to complete the corrosion
process, which is also a battery cell. Not to confuse the big battery with a
corrosion cell, which is nothing more than a very small battery. Anyway,
this worked so good that some techs decided to put a coat of oil on some
relays contacts, which soon started to fail in droves for our customers. The
problem turned out to be that when the contacts arced, the arc carbonized
the oil and this would soon prevent the contacts from closing.
So, this could be problem for a brushed motor in oil, however, since the
brushes are running in an oil system thus, no air, maybe no arc over either,
which, I think is likely the case.
So, my rule of thumb for things that can benefit from a coat of oil or
grease is if it doesn't move, it will benefit and if it moves, it could
cause a problem, such as relay contacts and switches and brushes, if not run
in a liquid. :O)
I find that most oils and greases are non-conductive, but I use dielectric
grease if I want to be sure around electrical stuff. Battery posts, I put a
few drops of thirty weight on top and on the bolt to let the vibrations
spread it out. Or I grease them with grease gun grease as it's readily
available. Keeps the salt water off too.
Bob Noble
http://www.sonic.net/bnoble
-----Original Message-----
From: Ron
Sent: Friday, August 26, 2011 11:26 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: re New Ideas ?
As for the oil cooled motor, a circulating and filtered system should allow
that E-Teck? 30HP output for 30 seconds to be extended to constant duty or
close, provided the oil flow and temperature are moved at a rate that takes
away that heat rejection.
I have seen many motors in liquid, just not brushed units, as Arby
mentioned. I just feel the increase of power through smaller electrical
things, along with capture of usable heat, otherwise wasted, should be
something of interest to almost everyone.
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