[PSUBS-MAILIST] Motor Issue

[James Frankland via Personal_Submersibles]

Hi All

Does anyone have any ideas on this?

Following the dive i did last week, i had a motor issue.  The motor did not
actually stop or fail, but during the dives it just didnt feel right.

The positive wire going into the rotating penetrator would get hot after
about 10 seconds of motor power.  I could also hear a kind of electrical
noise from within somewhere.

So, the next day i took the motor apart.  The oil (Silicone oil) was VERY
black.

I was expecting to see something had been rubbing, but i couldnt see
anything.  It all looked fine.

I put it all back together and it runs fine in air.  However, there does
seem to be a louder motor running noise than the others.

I am unsure what the issue is.  My feeling is that its carbon in the oil,
making it conducting and hence slightly shorting out, causing the heat on
the cable.

The other motor cable did not get hot, nor did the oil go black.

Again, another video here.  https://www.youtube.com/watch?v=v_VxVfhM9t8&t=2s

Would appreciate any input.  Im not sure what to do.  Buy a new motor?  Air
compensate it?

Many thanks
James
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20210719/5a4f5638/attachment.html>