Is there any reason you couldn't build a simple series-parallel stepped contactor controller? A 3-step is easy; you divide the battery in two and connect the halves either in series or parallel. A series resistor provides a "creeper" speed for starting out. Some commercial EVs (Citicar/Comuta- Car/Comuta-Van, Lectric Leopard, Henny Kilowatt, probably others) have used this scheme.
If you use a brushed DC motor with a separate field, you can get finer speed control by varying field current too. Since in a sep-ex motor the field uses much less current than the armature, a field controller is easier to build. It could even be a rheostat. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ 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)
