That GE-11 sounds like a really good motor. I love old industrial-duty stuff. <l:]
On Wed, May 15, 2013 at 9:25 AM, Roland Wiench <[email protected]> wrote: > Hello Mark, > > As I said before, the rear brushes are shunting the front brushes. The > rear > brushes are closer to the armature circuit connections to the communtator > bars, thus a more resistance path to the front brushes. > > This is normal in the three motors that I am using in my EV. I run three > types of motors in my EV. One is a WarP-9, a WarP-11 and a GE-11 which the > WarP-11 motor frame is the same frame as a GE-11. > > I have run the GE motor for 10 years where the rear brushes worn down 1/4 > of > the original length of 2 inches. The front brushes only worn down about > 1/8 > inch. Every 10 years as per GE maintenance, pull the motor, check spring > tension, resistance tests and check the communtator surface. > > I had my motor shop verify if the communtator needed any work. They said, > do not touch it. It still had a very smooth surface. > > It is noted that there were twice as many of communtator bars segments than > the WarP-11 motor. The brush angle is set very steep to where the brush > face contacts five communtator bars where the it makes with the next bar, > while the last bar is still in contact. This results in no arcing. > > Also note the motor is design only for clock wise rotation looking at the > pilot shaft of the motor. If you run this type of motor in the reverse > direction, you will chip the sharp edges of the brushes. > > The communtator bars are very hard and the brushes hardness are set one > point lower in hardness than the bar hardness. The brushes are very smooth > looking like tool steel. They are a silver-graphite compound. > > The WarP-9 and WarP-11 motor brushes are much softer and will wear faster. > You can get a option silver-graphite in the correct hardness for these > motors. > > Every 10 years, I switch the rear brushes with the front brushes. I am > still running the brushes in the GE-11 for 24 years where both are now at > the same length. > > Roland > > > > > > > ----- Original Message ----- > From: "Mark Hanson" <[email protected]> > To: <[email protected]> > Sent: Wednesday, May 15, 2013 5:25 AM > Subject: [EVDL] Dissimilar brush wear - data point > > > > Hi Folk's, > > > > > > > > Since swapping the brush locations (front rear), the rear brushes that > > were shorter are still wearing faster than the other 4 just now in the > > front location so it appears that the first one's to seat, suck most of > > the current (on the 9" "Impulse"). I ordered a milli-ohm meter (to > > compare to the one I borrowed) to verify the .2 milli-ohm between the bar > > that feeds the front brushes. George at Netgain has been very nice > > sending 3 sets of brushes over the last 10k miles since the motor is over > > a year old and I'm sure out of warranty. I'm just curious to what is > > causing the disimilar brush wear and the pattern seams consistent. It's > > always the rear brushes that seat and then wear first shunting the > current > > away from the front. But when I swap the positions the shorter brushes - > > now on the front continue wearing fast (wear down in 3K miles). I'm > > treating the others like a spare tire, giving another 3k miles for 6k > > total but most of the current is really gooing through a sing > > le brush instead of two, thus overcurrenting it and resulting in faster > > wear. > > > > > > > > Best Regards, > > > > Mark > > > > www.REEVA.info community service RE & EV's > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: > > < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130515/d6c258b2/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) > > -- Marcus Reddish *North Valley Systems LLC* Stevensville, Montana 406-360-8628 northvalleyev.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130515/08071bd2/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)
