[PSUBS-MAILIST] ROV opportunity

Mon Dec 21 00:31:40 EST 2015

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 water

with sand, grit etc in it, flowing over the windings, it will wear down

the windings thin coating.

Cheers Alan

  _____  

From: Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto: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 <mailto:personal_submersibles at psubs.org> > wrote:

Subject: Re: [PSUBS-MAILIST] ROV opportunity
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org <mailto: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 <mailto:personal_submersibles at psubs.org> >

To: Personal
Submersibles General Discussion
<personal_submersibles at psubs.org <mailto: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 <mailto:personal_submersibles at psubs.org> >
wrote:

  Subject: Re:
[PSUBS-MAILIST] ROV opportunity
  To:
"Personal Submersibles General Discussion" <personal_submersibles at psubs.org <mailto: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 <mailto: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/ <https://www.bluerobotics.com/%C2%A0These>  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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