Hi Ben,Thanks for the input. I agree that using a direct drive will require a
"larger" motor for low end performance. I figured on running a "large"
controller too. However, unless I am missing something taking the rear tire
size I am using and calculating the rpm at a 75 mph road speed returns approx
965 rpm which is approx 2700 rpm at the motor, which I don't consider
particularly "high rpm". Regarding the kit you mentioned, since I already have
1/3 of the components on hand its a non-starter. That and the 19K pricetag, LOL.
Keeping the VW transaxle doesn't fit in with my plans either but if I cannot
find a DC motor that looks good for a final drive ratio 3-3.5:1 direct drive I
do have the GE motor mount and final drive out of an early version of Dennis's
Current Eliminator laying around the shop. It uses a belt driven Harley
dragbike trans and chain for the final. All kinds of reduction choices there. I
was just trying to avoid chain, weight and complexity. That was why I was
asking what alternatives to the GE starter gen people had actually used and
with what degree of sucess. Dach.
On Thursday, October 23, 2014 11:12 AM, Ben Goren <[email protected]>
wrote:
On Oct 23, 2014, at 12:11 AM, David Chapman via EV <[email protected]> wrote:
> I should have added that I am looking at running a clutchless single speed
> gearbox around 3:1 final drive. Dach.
In that case, you're going to need an oversized motor to be able to handle
either the torque demands of low-speed driving or the over-revving of
high-speed driving. Similar types of engine stress apply to electric motors as
to gasoline ones; the physics starts out differently but winds up in much the
same place. Imagine always starting your Bug with the gasoline engine in third
gear, or keeping it in second gear on the freeway...one way or the other,
you're going to need an heavy-duty high-powered motor or else it'll burn up or
blow up.
If you go with something with enough oomph to be able to do away with the
transmission, you'll get something not unlike a drag racer, which would
certainly be a lot of fun. On the other hand, you'll likely save money by
either keeping the original transmission (which is what the EVWest kits I
mentioned in that other post do) or using some other variable gearbox.
Cheers,
b&
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