Hi,
I measured with a milli-ohm meter my Netgain-warfield-Impulse 9" brushes at .5
milli-ohms and the cross bar that connects two in parallel at .2 milli-ohms. I
calculated that the rear brush (since it didn't go through the cross bar) was
seeing about 85 more amps at 500A motor current going up a hill (when i smell
brush smoke). I get about 3k miles out of the rear brushes but the front 4
brushes are at the same length as new (with calipers). I could just let the
rear burn down and then it would be forced to the front brushes - but the fix
is symetrical brush rigging like ADC has - same bar lengths from the connection
armature bolt to each brush. When the first brush seats, then it shunts and
hogs all the current away from the other and the front brush doesn't seat
(until its' forced to by current). I saw only 1/2 contact area when I removed
the front brushes after 3k miles when the rears were worn down.
I could just look at it like changing oil every 3k miles or let the others wear
and go to 6k miles but my ADC's and prestolite's over the years went to 100k
miles before changing brushes.
Cheers,
mark in Roanoke
www.REEVA.info RE & EV's
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