[PSUBS-MAILIST] magnetic coupler

[vbra676539 at aol.com]

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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