If I go with chains, it'll be with something more substantial than
bicycle parts. The torque of that 775-1,000 watt motor can go way up
under heavy load (we're talking here of rolling loads up around 1,000
pounds going up irregular 30-35 degree slopes at up to 1.5 mph). Some
chairs have used chain drives under much lighter-duty conditions, and
still busted a chain. I can't afford for that to happen.
jeff
Seth Allen wrote on 12/15/06 16:00:
for that power level a bicycle rear sprocket might be the best alternative.
Or a single reduction into a bicycle rear sprocket for a variable 2nd
reduction. If you want to save weight and such.
Seth
On 11/30/06, Jeff <[EMAIL PROTECTED]> wrote:
I am doing some preliminary research on what probably will be turning
into a long-range project.
I'm wanting to hook up a permanent magnet motor of around 1 to 1-1/2 hp,
(though the lower end of that power range is preferred) to a motorcycle
gearbox.
I want it to have a wide-range set of gears so as to be able to have a
wide range of speeds and torqes available.
Sometimes I will want to be running it at normal speeds, and other times
(such as when towing heavy loads up steep hills) I want slow, steady
torque. The common EV method of choosing one gear ratio, and making the
motor and controller and battery pack deal with the overload is not an
option in this project.
I also need to keep the assembly size as small as possible, so as a
result was thinking possibly about a 150-250 cc motocross bike or ATV
engine that's blown a piston or something.
I have no access to motorcycles on a regular basis, so have no way to
check any of this out unless I pretty well know the answers before I get
there.
So, I'm wondering if this a feasible idea, or am I barking up the wrong
tree? I need 4 or 5 speeds in a compact package (the smaller the
better), and a motorcycle gearbox is adaptable to electric shift (that's
one of the other requirements).
Can anyone point me to a good source of info for what I'm trying to do?
I have already found much of the controller info I need, but the
mechanical stuff is harder to come by.
Thanks!
jeff
