Re: [EVDL] Gizmo EV "gearing"
david
have you emailed Mark Murphy at Blue sky design he is
in creswell oregon and originally built these veh
kEVs
david
have you emailed Mark Murphy at Blue sky design he is
in creswell oregon and originally built these veh
kEVs
--- Jeff Major <[email protected]> wrote:
>
> Hi David,
>
> You might want to consider forced ventilation on the
> motor. Sounds like your performance is O.K. Just
> that your duty cycle is too hard.
>
> Increasing the gear ratio will lower the load on the
> motor and slow down the top speed of the vehicle.
> That would likely make the motor run cooler, but
> take
> you longer to get where you're going. I'd try
> keeping
> the same ratio and blowing a lot of clean air thru
> the
> motor.
>
> Regarding the larger motor, you'd probably have to
> retune the controller.
>
> Jeff M
>
>
>
>
> --- "David D. Nelson" <[email protected]> wrote:
>
> > Hi all,
> >
> > I have a Gizmo EV (www.nevco-ev.com) which has a
> 48V
> > pack and a 6.7" D&D Separately Excited Motor. I
> have
> > run it for a year but the hill climbing I have to
> do
> > has started to burn up the motor. Jim H has it
> right
> > now to rebuild/repair. We had been considering
> > installing a 7.5" motor to see if it would handle
> > the
> > workout I give it a little better.
> >
> > I decided to do some calculations to see what rpm
> > the
> > motor was spinning and here is what I found:
> >
> > Speed : tire rpm : motor rpm
> > 10 : 171 : 514
> > 20 : 343 : 1029
> > 30 : 514 : 1543
> > 40 : 686 : 2057
> > 50 : 857 : 2572
> >
> > What I am wondering is if I can change the gearing
> > to
> > get a better than a 3:1 ratio maybe a 6:1 ratio
> will
> > I
> > still have the same top speed? Right now my top
> > speed
> > on the level is about 44mph. Jim, and I think he
> > said
> > Tim, thought that maybe the existing motor would
> > handle my needs if the motor spun at a much
> higher
> > rpm.
> >
> > My next question is, does any one have any
> > suggestion
> > as to where I might find some replacement
> > gear/pulleys? This is a belt driven vehicle which
> > has
> > the "teeth" in a V shape like this:
> >
> > \\\\\\
> > //////
> >
> > including the gap in the middle. The belt is a
> > GoodYear Eagle W-1280. I also need to know what
> the
> > smallest drive gear I can safely use. The current
> > one
> > is 30 teeth. The one on the drive wheel is 90
> Teeth.
> >
> > I have attached 3 pictures. (I hope this doesn't
> > violate list rules.) It appears that there are two
> > sets of bolts which bolt the gear/pulley on the
> > wheel.
> > One set bolts to the wheel hub, then there is an
> > aluminum adapter which then bolts to the gear it
> > self.
> > There isn't much room to go larger with the
> wheel's
> > gear since the belt would interfere with a
> support.
> > I
> > think I could go to a 115 tooth at the wheel so if
> I
> > could go as small as a 20 tooth drive it would be
> at
> > a
> > 5.75:1 ratio.
> >
> >
> >
> >
> >
> > David D. Nelson
> > [email protected]
> >
> >
>
>
>
>
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