[PSUBS-MAILIST] ROV opportunity
Alan James via Personal_Submersibles
personal_submersibles at psubs.org
Mon Dec 21 04:03:29 EST 2015
Hi Tim,I guess the distilled water would be more dielectric than tap water.What it's conductivity is, I don't know. But it would be a known quantity& you could calculate any power loss through electricity shorting through the water.The motors magnets would have to be coated to stop them rusting & you wouldneed to stop water wicking up the wiring by doing a good job epoxying it.I am just using an oil seal rated for 100ft & oil compensating. One of thetricks is to have the shaft under the seal polished, with no microscopic spiralsin the shaft that can cause the oil to pump out or water to pump in.Cheers Alan
From: T Novak via Personal_Submersibles <personal_submersibles at psubs.org>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org>
Sent: Monday, December 21, 2015 6:31 PM
Subject: Re: [PSUBS-MAILIST] ROV opportunity
#yiv0706546658 #yiv0706546658 -- _filtered #yiv0706546658 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv0706546658 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv0706546658 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv0706546658 #yiv0706546658 p.yiv0706546658MsoNormal, #yiv0706546658 li.yiv0706546658MsoNormal, #yiv0706546658 div.yiv0706546658MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0706546658 a:link, #yiv0706546658 span.yiv0706546658MsoHyperlink {color:blue;text-decoration:underline;}#yiv0706546658 a:visited, #yiv0706546658 span.yiv0706546658MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0706546658 span.yiv0706546658EmailStyle17 {color:#1F497D;}#yiv0706546658 .yiv0706546658MsoChpDefault {font-size:10.0pt;} _filtered #yiv0706546658 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0706546658 div.yiv0706546658WordSection1 {}#yiv0706546658 Alan,How would you think a flooded motor in an ambient casing would work out? The casing would keep the grit out of the windings. Then rinse out the motors with fresh water after each dive. I'm somewhat skeptical of the longevity and reliability of water flooded motors. Maybe have the motor assembly fresh water compensated i.e.: just flooded with distilled water similar to the oil compensated motors. No chance of polluting the environment.Tim From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: December-19-15 10:33 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] ROV opportunity Hi Pete,I have had a look at Doug's experiments with motors in the past.Some of them failed. & it may be a different story with bigger motors& higher voltage.I also have followed blue robotics since they started out as a Kick start venture. One problem I can see with the exposed motor is that with all the waterwith sand, grit etc in it, flowing over the windings, it will wear downthe windings thin coating.Cheers Alan From: Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sunday, December 20, 2015 4:44 PM
Subject: Re: [PSUBS-MAILIST] ROV opportunity
The Blue Robotics guys potted the terminals with epoxy and the thrusters are made with stainless/ plastic and aluminum. Doug was testing in simulated sea water.(ocean in a bag)
Pete
--------------------------------------------
On Sat, 12/19/15, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Subject: Re: [PSUBS-MAILIST] ROV opportunity
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Date: Saturday, December 19, 2015, 7:12 PM
Pete,I ran a
2000W motor in fresh water with a propeller but no
housing.It worked
well but was worse for wear afterward with a bit of
rustshowing +
the bearings seemed a bit rougher. From memory
therewas
rust on the magnets.Salt
water is a lot better conductor than fresh, so you would get
currentrunning
from the + to the - terminal & bi-passing the wire
windings.I think
it would be more trouble than it was worth to waterproof
&corrosion
proof the motor. And then there is the sand in the
bearings.Cheers
Alan
From: Pete
Niedermayr via Personal_Submersibles
<personal_submersibles at psubs.org>
To: Personal
Submersibles General Discussion
<personal_submersibles at psubs.org>
Sent: Sunday,
December 20, 2015 1:38 PM
Subject: Re:
[PSUBS-MAILIST] ROV opportunity
These thrusters are interesting in that they
are made with stainless/ plastic and aluminum. they are open
to the water and water actually runs thru them and cools
them. They claim that they can even handle some amount of
sand particles in the water. They are very small but
perfect for ROV use.
Could this be done with thruster sized motors.I
saw Doug Jackson doing the same thing with his ROV
motors.
Pete
--------------------------------------------
On Fri, 12/18/15, Douglas Suhr via
Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
Subject: Re:
[PSUBS-MAILIST] ROV opportunity
To:
"Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Date: Friday, December 18, 2015, 6:16 PM
Sounds
like
a cool opportunity if you've got the willingness
and time Brian. This past summer dad and I
were on the hunt
for a missing outboard
motor on a Canadian lake. We had a
camera
but no ROV. We actually ended up cutting a 15 foot
sapling to use as a camera pole. Depth was
only 17 − 20
feet so the sapling worked
pretty well as a camera handle
from the
boat (and we found the motor), but a controllable
ROV would have made things much easier.
It looks like those guys make some
nice parts for ROV projects. The technical
(software) aspect
scares me a bit, but
that's only because I am
electronically
challenged. ~ Douglas S.
On Fri, Dec 18,
2015 at
11:30 AM, Brian Cox via
Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
Hi
All, In my search
for some Soda Sorb I stumbled on to a dive
shop down in
Hollywierd , the shop owner
does a lot of business with
the studios and
wants me to build him a ROV camera
platform which has certain capabilities that are not
available at the present time. I'm
thinking about
trying to come up with
something for him. I found these
nifty
thrusters made by these highly motivated kids.
Link: https://www.bluerobotics.com/ These
thrusters are interesting in that they are
made with
stainless/ plastic and aluminum.
they are open to the water
and water
actually runs thru them and cools them. They
claim that they can even handle some amount of
sand
particles in the water. They are
very small but perfect
for ROV use.
Brian
Cox
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