[PSUBS-MAILIST] MK 2 Brushless Thruster

[Hugh Fulton via Personal_Submersibles]

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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