[PSUBS-MAILIST] MK 2 Brushless Thruster

[Alan via Personal_Submersibles]

Hugh,
it will see it equally from both sides. The system is oil filled & compensated with air
pressure further up the wiring tube, the oil will extend up the wiring tube & fill all the
housing 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 motor
> manufactured for the hobby market, to a direct drive low maintenance thruster
> purpose built for submersibles. The motor can run at 2000W continuously but
> will probably only need to be run at less than half of that for a reasonable
> underwater speed.
> In this version I have taken all the axial load off the 2 small motor bearings by
> putting 2 circlips on the propeller shaft either side of the main bearing at the front
> of 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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