[PSUBS-MAILIST] magnetic coupler

[hank pronk]

Vance,
I would have to say there is more than a 10% loss with oil filled motors.  Dr Nuytten told me the mag motors are way more powerful than the oil filled motors.  I can not afford the power loss, or rather the range loss.  maybe when the new sulfur batteries come on stream the mag couplers will make sense.  The cost is about the same for mag couplers  and mechanical seals, so it becomes a choice between range and guaranteed leak free service, if you have an internal motor.
Hank 



On Tuesday, March 4, 2014 1:36:16 PM, "vbra676539 at aol.com" <vbra676539 at aol.com> wrote:
  
I wonder what the loss is for running motors in oil, like the DWs, for instance? It might well be that running mag coupled motors in air with their attendant losses could still be more efficient than running compensated motors with shafts, which have their own sort of losses from internal turbulence, seal drag and the like. Not to mention that heat transfer is a whole lot better in air, certainly something to think about with high powered thrusters of the commercial variety. I would think that Dr. Phil took all that into consideration for the Nuyt-screws. Then again, you could just about build a K-250 for what one of those babies would set you back, so look this up under moot point in my case. 
Vance



-----Original Message-----
From: Alan James <alanlindsayjames at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Tue, Mar 4, 2014 3:08 pm
Subject: Re: [PSUBS-MAILIST] magnetic coupler


Thanks for the update Hank, 
glad to know I'm not missing too much by not having them. 
Alan 
 

________________________________
 From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Wednesday, March 5, 2014 4:47 AM
Subject: [PSUBS-MAILIST] magnetic coupler
  


After talking with a coupler manufacture, I learned there is a 5 to 10% power loss due to eddy currents.  I don't think it is worth the cost and effort given the depths I will reach.  Just for interest sake, the coupler for 200inlb torque is 1,200 dollars plus the containment shield. 
Hank     
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