On 5/15/2013 6:25 AM, Mark Hanson wrote:
I'm just curious to what is causing the disimilar brush wear and the pattern seams consistent.
Since we have well over 100 years experience with commutators, I have to believe this is an problem that has been well researched and well understood. However, this information seems to be a "lost" technology.
Maybe it would be worth studying some old books on motors. I had a great written in the 1920's. However, it got stolen (with a bunch of other stuff). It was from Lindsay Publishing, and they sadly now out of business.
I would think that the voltage drop of the brush-commutator interface is much larger than the drop in the commutator bar, brush bulk resistance, pigtail leads, and pigtail connection strip. Getting equal current in each brush then seems like a matter of making both brushes seat the same and have the same spring pressure.
-- ICEs have the same problem as lightbulbs. Why innovate and make better ones when the current ones burn out often enough to keep you in business? -- Hunter Cressall -- Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.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)
