In my 500 Interceptor I am using the PMG which was built for 72V and rated for 18HP and 28ft/lb of torque at 200A, now unless the Germans used a different method of computing power I'd say the PMG is pretty stout for a 25LB motor. The Etek is not quite the motor the PMG is (too darn expensive tho); two bikes, same ride in miles, similar sized bikes, me the heavier rider by 30 lbs on my Franken'ceptor, the Etek was too hot to hold my hand on (don't know the internal temps), the PMG warm but reasonable. The problem with Eteks the motor was not designed for 60VDC or more, high amps, proper cooling, or a decent rotor clip design (previous posts went on about the clips). I am not dissing the Etek, I think it has been over-amped and abused when it has failed. I think if you over-amp the Etek and it can't move the cycle any faster (mass/wind resistance) the extra amps turn into heat, the clips/solder let go, and the rotor comes apart - not because it spins too fast.
I am using the Altrax 300 Amp controller and find it more than adequate for the PMG, and it never gets very warm. 450 Amp controllers are for motors that can handle that. And for those thinking I dislike series wound, my next project will probably use a D&D series wound and a harley trans because I can handle the weight of both in the three wheeler on the drawing board. Check out Gary Krysztopik's 3 wheeler on Evalbum, I have been planning a similar roadster more on the lines of 1500lbs so it is still a motorcycle. Anybody have experience with the new improved Etek? A fairly quick scan on Evalbum: Seems there are more bikes with Eteks, fewer with PMGs, fewer still the Mars and then a couple with pancake AC motors; ratios 5:1 and higher are used in more than 80% of those bikes to good effect. A very few of the bikes have Series wound motors, do have some in sub-4:1 ratios but note by their owners a lack of acceleration. A couple have high 4s which sounds more reasonable. If your motor is indeed capable of 5000 rpm then let it get there, theoretical 70MPH+ speeds with 3 something to 1 ratios and achieve decent range are pie in the sky, the horsepower requirements to fight wind resistance at 45+mph are well documented. Go for the acceleration and range (let the motor work less, loses less amps in heat), that is what a EMC was made for. For those wanting CVT check out Ray Wongs bike (3:1>>1:1 CVT with a 3:1 fixed ratio on final drive), Dale in NM has a CVT for sale, save yourself some bucks. BTW: When I went through Evalbum just now I saw a lot of wishful thinking in the range box on Evalbum. Be truthful guys and gals... 75-100mph, 40+ mile range? Florida flat landers or hills and mountains? At what level of depletion? For a minute there I thought I was reading the Tabloids... Aliens found at root of electric car demise ;-) Have fun, Jeff On Mon, May 5, 2008 at 7:26 PM, Travis Gintz <[EMAIL PROTECTED]> wrote: > could you reference your sources? > > I've found that that is not true at all, as I've been in direct contact with > motorcycle owners using the ADC A00, A89 and K91 motors and NONE of them use > a ratio that high. Thats also a reason the eteks overspin and overheat, > because they're spun too fast and don't have adequate cooling. It can't be > spun lower because of its torque limitations (32 ftlbs, compared to my 50+). > Also, the HP is 15, mine maxes out around 19 or 20. The rpm maxes out around > 3400RPM, mine is above 5000. Its got a much wider power band, better cooling > (built in fan) and completely rebuildable. > > long and the short of it, its got more guts than the Etek, so I can't really > go on what chain/ratio other people used. > > And don't worry, I did weight/torque/acceleration calculations before I > decided on this, while its not going to be what the original bike gave me, > it will give me great acceleration, great range and good high speed. > > > > > > I think most of the bikes as a compromise > > between acceleration and battery range are more in the 5:1 to 6:1. > > >
