[PSUBS-MAILIST] MK 2 Brushless Thruster

[Alan James via Personal_Submersibles]

 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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