Drewcifer wrote:
If you used the speed sensor to feed Rpm data to an arduino duo programmed to a switching contactor that switches the voltages from series to parallel coupled with something like a precharge resistor to keep Amps the same but ramp up the voltage wouldn't you be able to accomplish what the hairball does but at a lower amperage and speed then one would need for drag racing?? Thus making it more cost effective and hobbyist friendly????
You don't want to switch an inductive load (like a motor) when current is flowing. If you do, you get hellish amounts of arcing. So to switch between series/parallel, you first have to take your foot off the accelerator pedal so the controller is at (about) zero motor current.
Then after the series/parallel switch, you can step on the accelerator again. It doesn't require a computer to do this, though you can use one anyway if you wish.
-- *BE* the change that you wish to see in the world. -- Mahatma Gandhi -- Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.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)
