Do you have any metering of motor current? I'm not familiar with how the AXE controller works with a shunt motor as I've only used them with series motors, but I imagine that if you are at low throttle, the motor current could actually be very high, while the battery current is low.
On Sat, Feb 21, 2015 at 7:36 AM, Dan Baker via EV <[email protected]> wrote: > Hey folks > > I'm hoping someone can help me with my EV. My snowpig ( > http://www.evalbum.com/4544 ) has suffered two drive motor failures in the > past two weeks! I purchased a D&D 170-04-01 8hp torque motor two years ago > to beef up my cart that I use to clear our dirt road for myself and > our neighbors. It had ran flawlessly till now. My cart has been the first > line of defense in keeping our road passable and this winter has been > brutal but not much different than the others we have had. A couple weeks > ago I noted some smell from the motor and then a sudden loss in power. > Upon dis assembly, I found heat damage, notably 2 of the brush springs had > melted. No idea if the brush springs were the cause of the heat or the > victims of it. All my connections were tight and no heat damage could be > found at the batteries, controller or motor terminals. So I called Mike > and Jeff at D&D up, they were very helpful and I ordered a replacement, > which is terribly expensive by the time this 61lb brute gets to my door > with shipping. I verified my alltrax 7245 controller's programming and > found that the turbo option was set, a field weakening option that gets a > small increase in speed. My snowpig rarely sees full throttle as it > trundles along clearing snow, the front MARS ME-1003 doing most of the work > running the blower. I verified all the rest of the options as per Mike's > instructions and put the cart back together. > Well I had to travel for work this week and left the snowpig for my father > to operate. We had two storms, the first one he had no issue but on the > second it failed again! Upon inspecting I found the resting pack voltage > was 50 volts in -6c weather (he had to abandon it on the side of the > road). Upon dissection of the second motor I found one brush completely > torn from the holder, it's metal casing in shards and lots of heat damage > again! > > Was the second motor a dud? What else could be the cause? I'm not looking > for blame, just trying to keep it from happening again. I have to once > again go away next week and we will likely have yet another dump of snow. > I'm going to try and make a motor of the two but I'm dismayed this may > happen again ;-( If I get a motor functioning again, I'm going to hook a > laptop to the AXE controller. and log a run but there isn't a lot of snow > left to clear as it has become rock hard with freezing rain so the blower > and cart won't see much load. > > Any help or ideas around keeping my pig running and our road passable would > be much appreciated! > > Thank you > Dan > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150221/7dbc12d9/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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150221/c5933455/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)
