[ausev] Trike conversion: Circuit Question.

[jefoy at mindspring.com]

For a lower voltage system this may have some benefit but in the example sited you are suggesting a rather modest 10% increase in system voltage. This is not likely to produce "exceptional acceleration". If this were something on the order of a 36V system the increase to 48V for a short burst would be much more pronounced. 

I think the electric drag racing community has experimented with various schemes to switch the motor from series wound to shunt wound. For short durations this would result in roughly doubling the available torque but is probably hard on the windings. I'm not sure but I think this bypasses the controller as well..
That would get your attention in a hurry on a light vehicle. Kind of like having a 150 shot N20 system on a Honda..

Jack Foy

-----Original Message-----
>From: jtp <jtp at onr.com>
>Sent: Nov 7, 2006 12:36 PM
>To: AustinEV News Announcements and General Discussion <ausev at austinev.org>
>Subject: Re: [ausev] Trike conversion:  Circuit Question.
>
>With a "Passing Battery", I would be looking for some exceptional
>acceleration boost only several times a week or month.
>
>While Erik has an excellent point in the controller not probably designed
>for the surge,  the idea for the DC to DC converter to rebound the battery
>would be a factor.
> While this would be more of a safety/performance type of consideration, my
>concern would be the momentary interruption of power at 96 volts to go to
>108 volts for the controller.
>  In addition,  If the 12 volt auxiliary battery were isolated further from
>a smaller "contactor holding/Headlamp-high-beam-ON- brighter-as-warning
>battery"  (I know this may sound rather over-complex in design, but I am
>aiming for quite a nice set of refinements with these questions),  I see
>typically an expectation of only several "booster-stage- voltage events" per
>week at very most.  This is especially worth consideration since a
>motorcycle has no "Packaging", or, a body of metal surrounding you for lots
>of safety.   A "Passing Battery circuit", if in fault, would default resting
>in "normal operation".
>Dan Petit.
>
>_______________________________________________
>AusEV mailing list
>AusEV at austinev.org
>http://www.austinev.org/mailman/listinfo/ausev