[PSUBS-MAILIST] MK 2 Brushless Thruster

[hank pronk via Personal_Submersibles]

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 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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