[PSUBS-MAILIST] MK 2 Brushless Thruster

[Alan James via Personal_Submersibles]

Yes, all oil compensated.It will help transfer the heat off the coils.I haven't finalized the oil & viscosity. I will run it out of the water with no load& see what amps it draws & compare that with differing viscosities of oil.I know I have seen figures on this site of 3 cst used in compensating oil, butdocuments I have read on oil compensated water pumps had 20 cst. Alsoon talking to the bearing engineer, he had concerns that the bearings would not float on a low viscosity oil & wear out quickly with metal to metal contact.Cheers Alan

      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Friday, April 1, 2016 1:23 PM
 Subject: Re: [PSUBS-MAILIST] MK 2 Brushless Thruster
   
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Sent: Friday, 1 April 2016 12:36 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] MK 2 Brushless Thruster  Hugh,it will see it equally from both sides. The system is oil filled & compensated with airpressure further up the wiring tube, the oil will extend up the wiring tube & fill all thehousing cavities in case this isn't clear.Cheers Alan

Sent from my iPad
On 1/04/2016, at 12:23 pm, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Alan the inner seal will see all the pressure.  Hugh From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Friday, 1 April 2016 11:48 a.m.
To: Personal Submersibles General Discussion
Subject: [PSUBS-MAILIST] MK 2 Brushless Thruster This is the latest iteration.The purpose of the project is to adapt a mass produced brushless DC motormanufactured for the hobby market, to a direct drive low maintenance thrusterpurpose built for submersibles. The motor can run at 2000W continuously butwill probably only need to be run at less than half of that for a reasonableunderwater speed.In this version I have taken all the axial load off the 2 small motor bearings byputting 2 circlips on the propeller shaft either side of the main bearing at the frontof the housing (second circlip not visible in dwg). Also I have used a larger outer rotary seal to be able to press it against a shoulder. The inner seal sees no pressure differential & is pressed against an internal circlip on one side. Some of the design is dictated by the assembly process. In assembly I will need to first press in the bearing then push through the propeller shaft with the internal clip on. Next assemble the housing then fit the second shaft circlip & finally the seals.The motor is located in the back housing with 4 pins.Alan   

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