I think its worth kicking around,, but I have seen explanations of
motors that have difffernt torque figures with the number of windings
I have a Cyclone 500 watt motor ,, i can keep it in a an rpm that
seems to keep it crisp and make the batteries last longer , I have
lots of gears ,,8 chain gears and 3 hub gears , the motor has a 15-1
gear reduction that keeps the motor spinning pretty fast,, i know it
means nothing without an amp meter but it really can climb hills and
accelerate pretty good.. I run it at 33 volts,, its rated for 24
volts but is a big improvement over the 24 volts in power..
i often cruise at 25 mph so i use close to the max power all the time
I have gone 35 mph when I pedal like crazy ...
I think in efect if you draw 100 watts off your batteries you
efectively have a 100 watt motor ,, I kinda see what your saying with
the higher voltage. Someone please correct me if i am wrong but when
you caculate watts you multiply ( amps X volts) so in effect you get
the hp produced making the change in voltage just changes the amps
used in a givin time,, but not changing the power(watts) produced to
keep the bike going at a givin speed..
Brad ,,
\\
hummmm what did i just say ,,LOL


-- In ebikebuilders@yahoogroups.com, "Eric" <busybee@...> wrote:
>
> Considering the huge difference in power needed to travel on flat
> ground vs climbing hills
> (http://www.alysion.org/ebiketours/power.html) I'm trying to figure
> out how to efficiently produce about 100-150 watts continuous on the
> flats, but still have a sort of overdrive reserve of 500-750 watts
for
> climbing. While 100 watts through the gears plus pedaling would get
> you over the hill, it would be slow going on the steep ones.
Pulling
> 5 times the amps might make sense if it got you over the hill 4
times
> faster. I doubt one motor could operated at peak efficiency at 100
> and 500 watts. Perhaps if the motor could operate on 12-48v and you
> had 4 12v packs that you could reconfigure on the fly into a 12v,
24v,
> and 48v system?
>
> A fairly straight forward approach would be to have one motor
> optimized for the flats and another overdrive motor assisting the
> smaller one as needed--a sort of double assist power system.
>
> So, an idea worth kicking around?
>