[PSUBS-MAILIST] magnetic coupler

[Alan James]

Thanks Hank,
I was thinking it would come together fast. Might be a sod to get apart again.
Maybe you could use a smaller magnetic coupler for other functions on a submarine.
For instance it could be the axle in a drum of cord that the emergency buoy or an ascent
warning buoy could be released with. The power of the magnet would stop the drum from
rotating & releasing line, but if you pulled the magnet out of the housing slightly you could
control the release speed of the buoy & avoid a birds nest in the line. If you had a drive on it
it could be set to slip against the buoancy of he buoy but reel in line if there was slack.
I've thought that sending up a buoy before ascending would be a good way of warning your tender
or any other pleasure craft. The tourist subs in Hawaii send up a huge bubble of air. The tender spots
this & radios an acknowledgement that they are clear before the ascent.
Alan



________________________________
 From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Friday, March 21, 2014 10:07 AM
Subject: Re: [PSUBS-MAILIST] magnetic coupler
 


Alan,
The oil filter looking part is the barrier that keeps the water out of the sub.  There is a magnet inside the barrier that is connected to the propeller shaft.  When you assemble this thing you need to be real carful.  The first time I slid the magnet assemblies together I almost lost a finger.  If the propeller gets jammed, the magnet drive would slip like a clutch. It would take a lot though, my magnet drive is bigger than it needs to be.  The propeller assembly  can still drop off in an emergency, that is all the same still.  I am pretty happy with the whole conversion, it can not leak! 
Hank



On Thursday, March 20, 2014 1:04:29 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
 
Hi Hank,
The part that looks like an oil filter is the covering over a rotating magnet?

The second part is the full assembly that fits over the magnet (oil filter) portion.
What sort of force is involved when you put together or pull the two magnetic portions apart?
If you jammed the propellor on something the internal magnet would still rotate
but can it pull apart separating the propellor & it's obstruction from the coupler?
I've added a link to the coupler.
http://www.psubs.org/projects/1327775450/gammarestoration/

Alan

From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Thursday, March 20, 2014 10:26 AM
Subject: [PSUBS-MAILIST] magnetic coupler
 


Anyone that may be interested, I posted a couple of pictures of my magnetic drive coupler assembly.  It is kinda chunky at about 9in long.  I can NOT overpower the coupler by hand, it is incredible how strong it is.  I pressure tested the assembly to 625 psi for one hr with no issues.  I will oil fill the shaft tube to lubricate the outboard shaft bearing and protect against corrosion.  This was a simple two day conversion with minimal machining required.
Hank
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