that was the reasoning i used for my bike, i have two eteks and my orginal plan
was to use P/S switching. the main reason i thought of using that was do to
current controllers at the time: the most powerful regen controller then was a
48 volt 400 amp. so i could put 400 amps at 24 volts to both motors in series
then switch to 200 amps at 48 volts in parrallel, but with kelly controllers i
didn't need to. with the 48 volt 600 amp controller i'll just leave it in
parrallel, 300 amp for each motor all the time [yes for only few minitutes at a
time]. another reason i when with two eteks is that a second etek is smaller
and lighter than any trany, heck its even smaller a comet torque converter.
now kelly has 144 volt 500 amp regen controller for only $999, you could run
two pmg132 in series and give each 72 volt and 250 amps peak [the most you want
anyway]. that will work nice with a 144 volt lithium pack of 100 amp hour cells
i'm still keen on figuring out how to use a trany though, its the best way i
can think of to reduce the power needed to move the bike and make a long range
bike, plus i miss the shifting.
Chris Tromley <[EMAIL PROTECTED]> wrote:
I think if you look closely you'll see a sport bike transmission is so
tightly packaged you won't have room to fit covers and seals to close it up.
Not to mention carving away the engine side of the cases and mounting the
resulting metal potato.
How about a completely different approach - why not get the effect of a
transmission with electronics? A Zilla controller will properly (important
concept) shift two motors from series to parallel and back. If you have two
motors they can each be smaller than a single motor. I'm thinking the ADC 5.5"
series looks promising. Jim Husted might be able to dig up something even more
suitable.
There are a number of advantages with this idea. More comm area, "shifting"
is ultra smooth because there is no change in rotational speeds, and the
mechanical implementation is WAY easier. It is no doubt pricey (less so if you
scrounge), but you might spend more in custom machining and reworking to adapt
a transmission. It should be pretty easy to get a two-motor setup to work well
first time out.
One important consideration: The S-P shift can be made automatic for cars
(senses current draw and shifts at a programmable point), but you want it to be
manual on an EM. The shift results in a step-change in rear wheel power that
could mess with your traction. Better to treat it like a normal two speed
transmission that you shift, just like any other motorcycle. Except there are
no gears.
When you think about it, this achieves exactly the same thing for an EM that
a gearbox does for an ICE. Gears on an EV are not typically the best solution.
When we use them it's usually only because they came with the donor.
Chris
On Thu, Apr 3, 2008 at 2:25 PM, john fisher <[EMAIL PROTECTED]> wrote:
> As to using a sport bike trans, that would be an idea. The only
> oiling for the trans is a splash oil. The shafts run on ball
> bearings. So if you could enclose the case, you'd be all set.
yeah I was assuming enough skill to be able to close up the box to keep oil
inside.
harry
Albuquerque, NM
http://geocities.com/hendersonmotorcycles/blog.html
http://www.austinev.org/evalbum/1179
http://geocities.com/solarcookingman
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