On 7/21/2024 10:03 PM, Lee Hart via EV wrote:
So, about the only way to really clean the motors would be
to submerge them, and run them at low speed while submerged.
I don't think it's that bad, John. In all my years using brushed motors, all I
have had to do is blow out the dust every few years with compressed air, and
everything was fine.
However, if enough dust accumulated for the motor to "flash over" from high
voltage, it could have created a carbonized path. In that case, you'd have to pull the
motor, take it apart to survey the damage, and repair or replace the brusholder
accordingly.
Not sure if you read the whole thread. Note that the drive system WORKS
- except for excessive electrical noise causing the Zilla to frequently
drop out. Measured a 9ma isolation fault from Pack - to truck frame.
This has been building up over some months, as the frequency of drop
outs - and toasting contactors, as been steadily increasing.
So, I disconnected the motors from the Zilla.
1) Before any cleaning, I measured 12.5 ohms from Field post to case.
2) After using lots of compressed air, I measured 13.4 ohms from Field
post to case.
Remember that this is a pair of Netgain Impulse 9" motors, wired in series.
Any suggestion that I disconnect the cables between the motors is a Not
Gonna Happen - since access to those connections essentially means
disassembling the front of the truck.
Ditto with removing the motors to have them professionally cleaned.
This currently leaves me with 2 possibilities that I can think off. I
keep hoping for something else that is within sanity of doing.
1) Since the motor air inlets are covered with ductwork, I could
possibly run the motors and pour water (with some kind of cleaner?) in
the air inlet to flood wash the motors. (Need to figure out if my 4v,
150A power supply can spin them.)
2) To prevent the isolation noise problems on the Zilla, I could move
the Zilla to a completely isolated 12v system. There are only a few
signals that have to cross the border, and those could be handled with
relays. (Note that this does not clear the fault - but I have a new
charger that is fully isolated as well.)
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