Cor, Gizmo's came with 6.7" by 11" or 13" or so long D&D motors. Some had I've seen Curtis and Altrax controllers for the series designs and Sevcon PP745 controllers for the SepEx designs. Mine came with the shorter version of the SepEx motor with a 3:1 motor:tire ratio which was too much for the motor and the daily 1/2 mile hill climb I had. I had Jim Hustead rebuild it and I went to a 3.75:1 ratio and added a cooling blower which helped immensely. With a 48V pack of floodies I could hit about 38 mph on the level. When I went to a 64V LiFePO4 pack I could hit 52-55 with it. Unfortunately the heat damage early on and also likely when I would go 50 mph for an hour or eventually lead to a couple of comm bars lifting. When I contacted a D&D Motors engineer about what to do he said that size of motor was really undersized for the Gizmo so he built me a longer one which added about 1.5" to the original's 3.5" armature. Naturally this greatly improved acceleration and hill climbing.
With the original motor it took 8.5kW from the battery pack to go 50mph. With the longer motor it takes about 7.5kW for the same speed. Since I had an over-temp switch installed in the new motor I have determined that the motor can handle 8.5kW sustained (again, from the battery pack) as long as the cooling blower is running and not trigger an overtemp event. I do not have numbers for the series setups but I do know a friend of mine could get in the mid 30's with a 48V pack. My Gizmo with eight 6V Interstate batteries weighed 993 lbs. With 40 TS-LFP100AHA cells (2p20s) it weighs 839 lbs. With my current setup I can easily get 70 miles range at 50mph. If the rig you are converting is going to be on hills I'd suggest looking into a SepEx setup or similar for the regen capabilities. It sure has saved my brake pads. They easily last three times as long as they used to. Check my blog or evalbum for more details or just ask. On Fri, Jun 6, 2014 at 1:43 AM, Cor van de Water via EV <ev@lists.evdl.org> wrote: > I am assisting someone to design a light 3-wheel EV that should be able > to run city speeds, > > no more than 40 MPH is needed and the weight will probably be under 1000 > lbs (plus occupants). > > Not very aerodynamic but that should not be a problem at these speeds. > > I have some idea of what components can be used - battery pack should be > Lithium to allow > > a good range and the voltage can be selected to match the performance of > the motor/controller. > > At a minimum (to maintain constant speed) I am estimating about 3kW of > power is needed, > > for (leisure) acceleration and hill climbing I am estimating about 10kW > peak power. > > Since price is an important design criterium, my inclination is to see > if one of the kits > > to give Golfcarts higher performance would be sufficient - most likely > that or a similar > > DC motor setup will be used for this design. This means probably a > battery pack of > > between 48 and 72 Volts. If necessary field weakening to get the motor > the higher > > performance needed for acceleration (like a kick-down) while normal > operation on > > the nominal voltage will give the more steady-state performance at lower > current. > > > > Any other recommendation for affordable yet durable motor and > controller? > > It is expected that the vehicle must be capable to run 200k mi without > frequent overhaul. > > > > Thanks for any advice, > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > <http://www.proxim.com> > Email: cwa...@proxim.com Private: http://www.cvandewater.info > <http://www.cvandewater.infom> > Skype: cor_van_de_water Tel: +1 408 383 7626 > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140606/63964d70/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) > -- David D. Nelson http://evalbum.com/1328 http://www.levforum.com _______________________________________________ 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)
