Mark, have you contacted Net Gain about this? Something doesn't sound right about it. I would think that they would have run into this problem by now. Maybe something didn't get built right with your motor.
David D. Nelson http://evalbum.com/1328 http://www.levforum.com Sent from my Nokia Lumia 920 Windows Phone 8 From: Mark Hanson Sent: 5/13/2013 12:03 To: [email protected] Subject: [EVDL] Brush uneven wearing, premature failure - fix 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130513/4e5cc90f/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
