[PSUBS-MAILIST] eRe: Alan's new motor

Thu Oct 4 19:52:39 EDT 2018

 Alan,If it was easy,,, well you know Hank
    On Thursday, October 4, 2018, 5:44:22 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,yes, this was what happened in my last pool test. I had a different motor &ran it for 30hrs before it self destructed. I had noticed the oil moving up the linewhen the thruster started. I didn't have a temperature sensor but must havereally cooked it. Multiple things went wrong. It had 3 hall sensors & they couldbe moved about to adjust the motor timing by heating the glue their board wasglued on with. It came lose so the motor timing would be seriously out of whackcausing more heating. Then there was the bad press fit of the stainless shaftI made for it......am learning.Alan

On 5/10/2018, at 9:28 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,Ya, I thought you were just trying to stop oil from migrating up the hose, but the oil is being forced up by centrifugal forces from the armature. Hank
    On Thursday, October 4, 2018, 1:50:10 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Thanks Hank,I like your method for making the bushing. It doesn't warrant a bearing& as I said the ceramic bearings are expensive. I was a bit confused about the oil trap but kept quiet :)Alan

On 5/10/2018, at 12:40 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,I just realized I misunderstood what your goal is, my idea of a oil trap will not help keep the oil in the motor.    The joints in my arm are plastic bushings made from PVC.  I use a hole saw to make a round plastic disk 1\2 in thick, then I machine a shoulder in the disk that fits tight into the arm member.  The disk has a centre hole drilled for the centre pin.  Seems to work real nice and is quick to make.Hank
    On Wednesday, October 3, 2018, 7:13:05 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,the oil tube is clear, so I'll monitor the oil level in the tube & see ifadditional over pressure helps first. Also I have a temperature sensorin the motor so if the motor runs cool enough I won't worry.Did you put bearings in the joints of your manipulator, or not bother?I am still running with the idea of a manipulator with an open gearbox& underwater motor. I can get ceramic bearings but they are expensive.Alan 
On 4/10/2018, at 12:23 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan, all you need is to interrupt the oil pathway, just take a larger container \pipe\ whatever and have the lower tube enter at the bottom of the vessel and have the exiting tube leave on the opposite side above it.  I use this method as a water  trap for my steam engine, under pressure.Hank
    On Wednesday, October 3, 2018, 3:39:28 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,I have the wires running out of the motor through the tube that theoil comes in through. At a point in that line I have a T where the wiresare epoxied & run without the tubing to the through hull, and the tubingcontinues on to the oil compensator. The compensator has a low oillevel switch, so there should always be oil in the line.There is increasing ambient pressure going in to the housing as you dive, so not sure how you would relieve that on ascent with some sortof oil trap! But I am not sure what idea you have.I am stuck on an Island for 3 weeks looking after a dog & cat then myother daughter is flying in & stealing my car, so won't bemaking any rapid progress on this :(. Alan

On 4/10/2018, at 9:29 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,You can make a oil trap in the compensation tube, its real simple.Hank
    On Wednesday, October 3, 2018, 12:32:59 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,I am hoping I can dial up the over pressure to the point that itkeeps the oil down. (like blowing in to a straw forcing the liquid out)The oil goes in through a clear tube so I can monitor the level.I am not confident though; however oil compensation has beenaround for a long time. Unfortunately I can't put a one way valve in the system as the pressure won't be able to escape on ascent.Below is the motor in oil without the proppeller.Alan<image1.JPG>

On 4/10/2018, at 1:34 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,I have had similar situation, the oil will still come up the tube.  The over pressure makes no difference, unless there is a piston or diaphragm blocking the oil.Hank
    On Wednesday, October 3, 2018, 2:53:29 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,yes very patient "lol" as this might not be the final version.I have tested the motor out of the housing in a bucket of oil & establishedthat it could only be run at 30 Amps without overheating. It causes quite a turbulence running in oil with no prop on due to the open design of a rotating back section. It will want to force oil out of the housing & up the oil feed tube,but I am hoping the overpressure from my oil compensator will keep the oilin around the motor. Am learning a lot on each attempt.Alan

On 3/10/2018, at 9:06 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan, your patience is amazing.  I would be itching to test it before sending it away for anodizing.  Hank

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