With a 14 to 41 gear ratio and using the same Tropica motor my motorcycle
does 60mph at an estimated 3000 rpms. I did the math way back when I first
built the bike by rolling it 100ft and counting the revolutions of the motor
shaft. Taking the 100 ft number and muliplying it by 53 will tell you your
RPMs at 60mph. This works since there is a little less then 5300 feet in a
mile and at 60mph you cover the distance in one minute.
You will have no problem running your motor at 96v as these motors can be
run up to about 120v. The name plate rating is 72v. When you run the motor
at a higher voltage it is good to advance the brush timing to keep the motor
from arcing. Running at a higher voltage is easier on a motor (to a point)
as it allows the motor to spin faster and cool more efficiently. The
controller could care less.
If I were you I would definitely do 96v.
damon
From: Mark Hastings <[EMAIL PROTECTED]>
Reply-To: ElectricMotorcycles <[email protected]>
To: [email protected]
Subject: [ElectricMotorcycles] 48 or 96volts with a tropica motor? AC4?
Date: Fri, 25 Nov 2005 08:04:45 -0800 (PST)
I was test fitting BB600's the other day and I think I have found that I
can get about 96 volts on the motorcycle without much problem. While it
probably would be easier to run one string at 96 volts I am concerned that
even at my top cruising speed I'll only be sending <48 volts or maybe <36
to my tropica version (AC4?) of the 6.7" ADC motor.
If I remember correctly a few weeks back I found a note that it turns
faster then the A89 6.7" motors by a good 30-50%
Based on that I think it is more a limitation of the RPM to voltage curve
then my gear ratio and in reality I can't change either. (yeah yeah it's a
shaft drive)
1) Do you think always having the controller step down so much is going to
create heat problems and waste energy? Or ruin the controller? If so I
could run two strings of cells and halv the voltage
2) Does anyone have any experience with this motor on a motorcycle and know
the voltage to rpms or voltage to speed and could give me their gear ratio?
