Re: [PSUBS-MAILIST] Pressure Compensated Trolling Motor Question

[Warren Greenway <opensourcesub@yahoo.com>]

Yes, the brushes may be replaced with other materials.
Many permanent magnet motors use copper brushes. They
are much more expensive and wear the commutator more,
but do work. Copper brushes of various sizes are 
available at any decent auto-parts store. Copper
brushes
will fill your fluid with copper dust eventually, just
like carbon. What about a simple windage tray that the
rotation of the armature causes the oil to circulate 
through, that in turn "scrapes" the heavy particles
out. You could then clean the scraper periodically.

Warren.

--- SFreihof@aol.com wrote:
> In a message dated 03-06-26 16:31:02 EDT, you write:
> 
> << I have a question for anyone using Liquid
> Compensated Trolling motors.
>  
>  I've heard that the drawback to them is that the
> carbon dust from the 
>  brushes goes into suspension and eventualy causes a
> ground fault to the 
>  case (or direct short if no ground fault detection
> is used).  This seems 
>  quite plausible with the simple solution being to
> change the 
>  compensating fluid regularly. >>
> 
> Question:  Do brushes have to be carbon?  Can they
> be replaced with copper 
> brushes to eliminate the graphite dust?


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