On Tue, Jan 15, 2013 at 11:12 AM, Electric Blue auto convertions < [email protected]> wrote:
> When I was working for Clark fork Lifts in the late 60s they didnt have > controllers as we have today, They used a set of Caps, High voltage > rectifiers and Xfrmers , The Xfmers /caps could go as high as 300 volts on > a 48 volt battery system, there was 4 large contactors , one was reversing, > one was for field weakening , They had what was a very rudimentary > "controller" only about 5 or 6 resistors a few diodes and some small caps , > this went to the "gas peddle" the large Recs could handle over 1,000 amps . > The earliest electric fork lift I worked on was from the early 40s, It had > a "gear shift" lever that hit 3 different resistors, "large" for different > speeds, and one reversing contactor,, simple and it was still in use way > back when I had to rebuild the motor,,,, brushes and clean the Com + > springs , thats all it needed I remember a post years ago (maybe from Lee?) about speed controls on trolley cars that were quite smooth and sophisticated. I think it was a drum-style multiple position switch with all sorts of clever enhancements to transition from stage to stage, ensure you couldn't engage two stations, etc. With the cost of modern solid-state controllers, I have to wonder if you couldn't make a really slick mechanical controller. With enough stages it would be almost as smooth, more efficient, and a lot cheaper. Chris LeSled is for sale! http://www.evalbum.com/274 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130115/237d79db/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)
