Hi Dan and All, Likely overloading it by not enough gearing without any other details is the best guess. Also you need to run in new brushes for an hr or so no load on 12vdc or what happened could happen.I'm doing that now with my D+D ES31,the big brother to yours getting my Ewoody going.You should NOT use FW except at high rpm and lower loading.I didn't know the 7450 had FW in it. Likely just a ramp setting for an external one.I use FW every day though with a contactor controller works great except kills torque at starting, lower rpm's.And gives more than a little with 50% high speed doable. But not needed or wanted in your app. Jerry Dycus From: Dan Baker via EV <ev@lists.evdl.org> To: Electric Vehicle Discussion List <ev@lists.evdl.org> Sent: Saturday, February 21, 2015 9:36 AM Subject: [EVDL] Help! - Double motor failure! 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/f10ada80/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)
