[PSUBS-MAILIST] Pressure proof motor

Sat Dec 9 23:00:25 EST 2023

Hi Allen,

Thanks for sharing that write up, I really appreciate it.
I do have hopes for brushless motors and oil
compensation.  At some point I'll pick up a cheap unit
and play around with. hopefully we can figure which
ones are not putting electronics in the motor bodies.

I was present when Cliff emptied the black sludge
out and immediately thought I should start thinking
about brushless motors, even if they aren't as suited
for low rpm applications like ours.

Also apologies for calling James (and not even
Spelling that correctly!). Power is out here and I
Am poor at typing on the phone.

Sorry about the extra work. My avoidance of Facebook
is for personal ethical reasons.

Thanks!
   Ian.

-----Original Message-----
From: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Dec 9, 2023 7:07 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Pressure proof motor

Ian,I tried twice to send pictures but files must be too big for this format. The last time I only attached two photos.
The Psubs facebook page has 900+ followers. I have photos & videos on two posts about the thruster.
There is another post on an air compensator I built that may be of interest to you.
The fb format is a lot easier to put up photos and videos on. Also you can post comments and "like" what someone has posted or said without them going out to everyone & filling up their mail box.
But here is a portion of the failed mail.....

Brushless 2200W rated to 48V but could run off 36V.
I bought the bottom unit only as was half the price.
Motor only weighed 15lbs (7kg).
A lot of empty space inside the can. Probably take a litre
of oil to compensate it. But lots of area to put in fill & drain holes. It has a skeg on the bottom which I will cut off (should I use it). The motor portion of the cut off skeg would be a good place to put a drain hole in. It has two lip seals and a dust seal. Two decent sized bearings. 
The o-ring groove & mating face were done well. 
The hole that the wire came out through was sharp on the edge; they could have rounded that to stop it wearing on the wiring jacket.
It is a sensor-less motor, so no position feed back from sensors, but then the sensors are usually the first thing to fail. 
In my view it would be a much better option for oil compensation than a brushed motor like the Minn Kotta, where the oil can lift the brushes or be contaminated by wearing brushes. One post recently seemed to indicate that the compensating oil was degrading the brushes.
At the front end there are holes that have been filled in with something. There may be thread in the holes to bolt on an anode. If not, they could be drilled out to put in an anode. 
The propeller is about 4&1/2 to 5" pitch ( cant remember the diameter & am out). Designed for pushing a boat up to 20ft. The motor is quite a large diameter to get more torque & is geared down, with the low pitched propeller, ideal for pushing a sub.
There may be a better motor out there that doesnt require such a huge volume of oil or air to compensate it. 
If you are looking for a brushless option, some of the motors have electronics inside them, including large capacitors that will crush under pressure. 
Cheers Alan

Sent from Yahoo Mail on Android (https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_)
On Sun, 10 Dec 2023 at 8:55 am, irox via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

Hi Jamie's,

Thanks for doing that and creating a write up of it.  I am interested
to know how it went. Would it be possible to get a copy of that? 
 Or a summary maybe?

The Facebook group is closed to non-facebook members, and
I am not going to join Facebook any time soon.

Thanks,
Ian 

-----Original Message-----From: Personal Submersibles General Discussion <personal_submersibles at psubs.org>Sent: Dec 9, 2023 10:38 AMTo: Personal Submersibles General Discussion <personal_submersibles at psubs.org>Subject: Re: [PSUBS-MAILIST] Pressure proof motor

James,I did two posts on Psubs facebook page about the motor.
I pulled it apart for the second post.
AlanSent from Yahoo Mail on Android (https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_)
On Wed, 29 Nov 2023 at 2:07 am, James Frankland via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

_______________________________________________Personal_Submersibles mailing listPersonal_Submersibles at psubs.org (mailto:Personal_Submersibles at psubs.org)http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________Personal_Submersibles mailing listPersonal_Submersibles at psubs.org (mailto:Personal_Submersibles at psubs.org)http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

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