[PSUBS-MAILIST] MK 2 Brushless Thruster

[Alan via Personal_Submersibles]

Hank,
Not a bad idea.
I could run horizontally from the air bleed passage above the shaft.
As the water will sink in the oil it won't go up there hopefully, although
with the shafts rotation I am not sure if any water will emulsify in the oil.
Will depend on the oil to a large degree. I will still retain a small portion
of clear tube underneath as an indicator with a drain plug.
Cheers Alan


Sent from my iPad

> On 1/04/2016, at 12:06 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Looking good!  you could eliminate that external compensating hose by drilling a horizontal hole to intersect the vertical passage leading to the tube.  The oil could pass by the armature and feed the passage leading to the bearing void.
> 
> Hank
> 
> 
> On Thursday, March 31, 2016 4:51 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> 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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