Hello Jay,
Another test you can do, is take a ohm reading at the motor terminals. Rotate the motor by hand and see if the meter shows a pulse as it rotating. Then disconnected the motor controller leads from the motor. Next, take a reading from each motor terminal to the motor housing. A new motor that is brush dust free, should read about 20 megohms or as a open circuit. I do this every time with a new motor or when the motor is clean. In about 10 years of running it is common this reading will get down to about 30 Kohms, then its time to clean the motor with a motor cleaning solution you can get from a motor shop. Pull back the brushes off the commentator and take a another ohm reading of each motor terminal to the motor housing. No resistance reading will tell you that the field windings are ok. A resistance reading will tell you which field winding is grounded to the motor housing by a field winding or it may be just brush dust. Then insert each brush in each brush holder and check the resistance to the motor housing of each brush. Be sure to remove that brush before you test the next on. I found a shorted commutator bar in my motor, pull the commutator and had a local motor shop repair it. I also took the motor housing to them and have them check the field windings that I seen was pressing against the end motor bells which press wires flat. I had them clean the housing of the motor, re-enamel the windings. Also I had the entire inside surface of the motor enamel coating so as to insulated the inside of the motor housing from any tracking of the brush dust. It is very common for the brush dust to travel down the face of the commutator and down to the motor shaft. I also had them enamel the front of the commentator down to the motor shaft and on the motor shaft up to the motor bearings. Do the resistance test of the motor again, so you have a future comparison test. I normally do this test about once a year or when I see my motor ampere is a little higher at a recorded rpm. Roland ________________________________ From: EV <ev-boun...@lists.evdl.org> on behalf of Jay Summet via EV <ev@lists.evdl.org> Sent: Thursday, December 29, 2016 8:25 PM To: Robert Bruninga; Electric Vehicle Discussion List Subject: Re: [EVDL] Shorted FB1-4001A DC motor? On 12/29/2016 05:42 PM, Robert Bruninga wrote: > If its a DC motor, Try a 12v car battery and jumper cables to test the > motor. > I've verified that the motor still turns (can push the truck with the transmission in gear) so I'm going to look at the brushes first and if I don't see anything wrong try powering it from a battery in neutral. Jay _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.html#usub> EVDL Subscription Information and Help<http://www.evdl.org/help/index.html#usub> www.evdl.org About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV enthusiast Clyde Visser, is an active and vital source of information and help for people ... http://lists.evdl.org/listinfo.cgi/ev-evdl.org EV -- Electric Vehicle Discussion List - lists.evdl.org ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> lists.evdl.org The Electric Vehicle Discussion List is a forum for discussing the current state of the art and future direction of electric vehicles (EVs). We define an EV as a ... Read EVAngel's EV News at http://evdl.org/evln/ EVDL EV News Archive - Electric Vehicle Discussion List<http://evdl.org/evln/> evdl.org EVLN - EV News Archive Edited by Bruce {EVangel} Parmenter: EVLN: home | help | archive | news | privacy policy | terms of service Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) [https://s1.yimg.com/dh/ap/default/130909/y_200_a.png]<http://groups.yahoo.com/group/NEDRA> Yahoo! Groups<http://groups.yahoo.com/group/NEDRA> groups.yahoo.com / -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20161230/e615da66/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
