I use a use a heavy duty high charge alternator at idle which for me is 300 rpm at the electric motor to 1200 rpm at the alternator. Use a 4:1 cog pulley and belt drive. The alternator needs at least 1100 rpm to excite the fields to come on. These are sometimes known as inverter-alternators or converter alternators that are use in ambulances, utility trucks and motor homes that uses 120 vac 60 hz up to 6 kw from these units.
It has external taps that have NEG FIELD, POSITIVE FIELD, and TRIO. To generate 120 vac 60 hz up to 5 kw there is a inverter made by the Dynamote Corporation that connects to these external taps. It can generate 6 kw and at the same time can supply a current for 13.5 to 15 vdc charging using external adjustments. Or you can just generate 110 vdc only that will start to generate at about 30 volts at 300 rpm and rises to 110 volts at 1100 rpm. You can let it idle down to 300 rpm which will still maintain 110 vdc at a maximum 1200 watts. Connect a 100 ohm 200 watt potentiometer across the positive field terminal and trio terminal and you can adjust the voltage from 30 to 110 vdc. This output voltage is ok for resistance loads like heaters which I may connect up three small heaters up to 1000 watts. I later add a inverter unit that is rated at 5kw at 120 vac true sine 60 hz. There are other ways you can convert a standard alternator by using a alternator converter kit or go on line to see how you can make and install these components. Just type in your search engine - Convert a Alternator for 110 vdc to 120 vac - Roland ----- Original Message ----- From: Jan Steinman via EV<mailto:[email protected]> To: [email protected]<mailto:[email protected]> ; [email protected]<mailto:[email protected]> Sent: Friday, August 22, 2014 4:34 PM Subject: Re: [EVDL] Conversion advice (regen) > From: Lee Hart via EV <[email protected]<mailto:[email protected]>> > > An easy way to get modest "engine braking" style regen is to add a > second small generator, optimized for regen. This can be as simple as > rewinding the stock ICE alternator to work as a high voltage generator. I have a friend who owns a motor service/rewinding shop. He says it would be cost-prohibative to do so, if you had to pay someone to do it. I think all modern alternators are three-phase "Y" configuration, which is a bummer. A delta-configuration might be simple to get triple the voltage out of. Has anyone had one of these things apart to see how hard they'd be to boost voltage on? > Use the field to control the voltage and current it generates, as usual. > With the field off, the alternator just freewheels. With the field on, > it generates. Simplest case, run the field on your brake light switch, possibly with the help of a relay. I saw one scheme where someone added an electric clutch, as used by air conditioners. But is that really necessary, given Lee's assertion that the field-less alternator has very little drag? > Though automotive alternator efficiency is low, they are capable > generating amazingly large amounts of power for short time periods (like > regen). I have a Nevile-Leece 2kW alternator that came off a fire truck, and am planning to use that for regen braking. :::: We don't have an energy crisis; we have a consumption crisis. -- Ozzie Zehner :::: Jan Steinman, EcoReality Co-op :::: _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140822/11df9bf1/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)
