Lee, Good point about the motor's duty cycle.
________________________________ From: EV <[email protected]> on behalf of Lee Hart via EV <[email protected]> Sent: Monday, November 28, 2016 12:58 AM To: Jan Steinman; Electric Vehicle Discussion List Subject: Re: [EVDL] OT Reversible DC motor controller Jan Steinman via EV wrote: > Keep in mind that many high-speed motors are designed or adjusted to operate > optimally in one direction. The brush location is "advanced" so that the > magnetic field is at the optimum location for a particular direction and > speed. Running such a motor in reverse often results in arcing or poor > performance. > > Of course, if the motor was already intended for bi-directional use, it is > probably timed neutral, and there's no problem. I think he said he was using a car seat adjustment motor. They need to run equally well in both directions, so the brushes are probably at neutral position. Besides, at 12v brush advance and arcing isn't much of a problem. The main concern I have is that a seat adjustment motor is only built for intermittent duty, and would overheat if run for more than a minute or so. And, the gears are also likely to be designed for a short life. The manufacturer doesn't expect it to run more than a few seconds per day. Something like a windshield wiper motor may be a better candidate. They are meant to run continuously, so the motor and its gear train have to be a bit more robust. -- The problem in this business isn't to keep people from stealing your ideas: It's to *make* them steal your ideas! -- Howard Aiken -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com<http://www.sunrise-ev.com> The Sunrise EV2 Project<http://www.sunrise-ev.com/> www.sunrise-ev.com The Sunrise EV2 Project Homepage. Welcome! We are a group of dedicated electric vehicle enthusiasts whose goal is to create an affordable, high performance electric ... _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub 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/20161128/f93acbed/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)
