[PSUBS-MAILIST] Personal_Submersibles Digest, Vol 52, Issue 1

Tue Oct 3 14:19:09 EDT 2017

Brian, I've been looking at higher current dc-dc converters recently. The
brand I've been looking at is "Vicor." Other brands I've used are Pololu
and Dimension Engineering.

River J Dolfi
Rdolfi7 at gmail.com
412-997-2526 <(412)%20997-2526>

On Oct 3, 2017 10:11 AM, "via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

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> Today's Topics:
>
>    1. Re: magnetic linear actuator (Alan via Personal_Submersibles)
>    2. Blue Robotics (Alan via Personal_Submersibles)
>    3. 36v to 24v transformer (Brian via Personal_Submersibles)
>    4. Re: Blue Robotics (Brian via Personal_Submersibles)
>    5. Re: 36v to 24v transformer (k6fee via Personal_Submersibles)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 1 Oct 2017 04:28:03 +1300
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] magnetic linear actuator
> Message-ID: <C7B72FE7-BC74-4A9F-95EB-7BD14985E747 at yahoo.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Hank,
> you mean like a solenoid with a long stroke?
> I have been designing a solenoid operated ballast valve but haven't got
> round to working out how many turns of wire, how much force I need &
> how many amps it will draw.
> A lot of solenoids have a short duty cycle, as they heat up pretty quick.
> I would imagine this could be a problem if you wanted to hold something
> in position for a long time.
> Alan
>
>
> Sent from my iPad
>
> > On 30/09/2017, at 10:32 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> > Alan,
> > I have not taken one apart yet but it sounds like it is a tricky one.  I
> was hoping there was some sort of magnetic rail actuator.  I have been
> Googling around but have not found anything yet.  I have had superb results
> with electro magnets under water (fresh)  and figure that could be the
> answer.  I  will keep looking.
> > Hank
> >
> > On Friday, September 29, 2017, 8:07:33 PM MDT, Alan via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> >
> >
> > Hank,
> > I spent a lot of time investigating oil compensation of linear actuators
> along
> > with Frank.. He was looking at the Lenco trim tab actuators.
> > Have several. The motors in them are small & brushed & run rough in
> > oil. When the rod extends that leaves a void inside the actuator that
> needs
> > to be filled. So you end up with an external oil reservoir to fill the
> actuator
> > with ambient pressure oil as it extends. ( so why not just push it out
> with the oil)
> > There are micro switches that I drilled with tiny holes, to let ambient
> pressure
> > in so they didn't trigger under pressure. Also there are electronics in
> some
> > actuators that may be effected by pressure. And of course there is the
> wiring
> > going in to the actuator that needs sealing & the seals on the rod that
> may need replacing.
> > Much simpler to use hydraulics. I did see an electric manipulator
> operating
> > at the Underwater Intervention Convention. Can't recall it's name.
> >    From time to time I have a google on robot sites to see what is new.
> Or
> > Alibaba to see if the Chinese have come up with anything cheap.
> > Nearly bought a kids hydraulic arm toy that you assemble, with view to
> > scaling up out of aluminium.
> > Keep thinking, but the robotics World is big & if there is a new &
> easier way
> > of doing it they'll find it.
> > Alan
> >
> >
> > Sent from my iPad
> >
> >> On 30/09/2017, at 1:08 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >>
> >> I have been brain storming looking for a less expensive and less
> complicated means of building manipulators.  The obvious choice would be
> electric liner actuators, oil filled etc.  Then I was thinking about a
> magnetic actuator like a mag lev rail.  Is there such a thing?  You know,
> add more voltage and the actuator moves out further.  Any ideas?
> >> Hank
> >> _______________________________________________
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> >
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> Message: 2
> Date: Tue, 3 Oct 2017 16:40:42 +1300
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: [PSUBS-MAILIST] Blue Robotics
> Message-ID: <32A0AFFE-E039-4893-9936-9A7A72522FD7 at yahoo.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Wandered on to the Blue Robotics site & saw these reasonably priced
> cable penetrators that may be of use to someone.
> https://www.bluerobotics.com/store/connectors/penetrator-10-25-a-8mm-r2/
> If I used them I would go over the cable jacket with a good pvc glue.
> They also have a 1500 lumen light for $99- that is rated to 300 meters.
> https://www.bluerobotics.com/store/electronics/lumen-light-r1/
> Alan
>
>
>
> Sent from my iPad
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> Message: 3
> Date: Tue, 3 Oct 2017 10:43:26 -0400
> From: Brian via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] 36v to 24v transformer
> Message-ID: <002301d33c55$f93dcce0$ebb966a0$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
>   Before I start scouring the web and before I make any moves - can anyone
> recommend a 36v to 24v transformer that supports enough amps to run a
> trolling motor or two?  Just musing here for now.  Thanks.
>
>
>
>
>
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> Message: 4
> Date: Tue, 3 Oct 2017 10:59:38 -0400
> From: Brian via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Blue Robotics
> Message-ID: <002801d33c58$3c7251f0$b556f5d0$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> What a great site!!! All sorts of ways for me to spend money.  Servos .
> hmmm
> .. Might be small, but maybe one of them could be powerful enough to work
> as
> an external rear thruster actuator . Hmmm ..  Mount the new motor on Delrin
> bearings so basically frictionless in water .. Hmmm ..
>
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> Message: 5
> Date: Tue, 03 Oct 2017 08:07:38 -0700
> From: k6fee via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] 36v to 24v transformer
> Message-ID: <831527.5364.bm at smtp210.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Brian,
> It will need to be a converter as transformers only work on AC not DC
> voltage.
> The difference is a converter uses a chopper circuit to convert the DC to
> AC so it can then raise or lower the voltage to the desired value then
> rectifies it back to DC.
> Keith T?
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
> -------- Original message --------From: Brian via Personal_Submersibles <
> personal_submersibles at psubs.org> Date: 10/3/17  7:43 AM  (GMT-08:00) To:
> personal_submersibles at psubs.org Subject: [PSUBS-MAILIST] 36v to 24v
> transformer
> ?? Before I start scouring the web and before I make any moves ? can
> anyone recommend a 36v to 24v transformer that supports enough amps to run
> a trolling motor or two?? Just musing here for now.? Thanks.??
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> End of Personal_Submersibles Digest, Vol 52, Issue 1
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