DIY Electric Car Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
70 Posts
Discussion Starter #1
I am converting a VT700(Harley Sportster =

clone)Honda from 1987. The shaft drive is set. I smoked an 8 inch =
diameter =

Yale forklift motor in just a 1/3rd mile up hill test. Much sizzling and =

crackling with the smoke. I drove another time and kept the voltage to 3=
6 but =

it still heated up even on level ground with mild hills. I need somethin=
g that =

will take the big back wheel and 3.5 to one gear ratio. I am running a C=
urtis =

120vdc 1221C which is 400 amps max. The problem is heat disipation=
. The Yale =


just can't do it. Also the bike has 20 Hawker 13EP buddy paired at 220 p=
ounds. =


I'm 240. The bike with motor has to be at least 200 or so. The back t=
ire is =

large. 24 inch in diameter. I figure 2941rpm at 60mph. I think part of t=
he =

problem is moving so much weight at such low rpms. If I could find a mot=
or =

which was designed to take 200 to 300 amps continous that might work. I'=
d like =

to keep the brushed motors but I'm open to suggestions. I'm hoping a K o=
r maybe =

an L91 will work better. Lawrence Rhodes.....


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #2
Lawrence,
I would consider these two things to do.
A two to one cog belt reduction. Turn the motor around and extend the shaft.
Put the cog pulleys and belt on the motor on the front end. I used to buy
belts with stainless steel cores and one off pulleys from a company, I think
Pullman. If you are interested I will see if I can find them.

BIGGER THEN THE PULLIES, You seem to not want to go here but I would do
forced air cooling. No other way to do it in my mind, especially at those
low RPMs.

Sincerely,
Mark Grasser
=


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Lawrence Rhodes
Sent: Monday, March 07, 2011 5:39 PM
To: [email protected]
Subject: [EVDL] Second opinion on motorcycle with 3.5 to one gear ratio.

I am converting a VT700(Harley Sportster =

clone)Honda from 1987. The shaft drive is set. I smoked an 8 inch
diameter =

Yale forklift motor in just a 1/3rd mile up hill test. Much sizzling and =

crackling with the smoke. I drove another time and kept the voltage to 36
but =

it still heated up even on level ground with mild hills. I need something
that =

will take the big back wheel and 3.5 to one gear ratio. I am running a
Curtis =

120vdc 1221C which is 400 amps max. The problem is heat disipation=
. The
Yale =


just can't do it. Also the bike has 20 Hawker 13EP buddy paired at 220
pounds. =


I'm 240. The bike with motor has to be at least 200 or so. The back t=
ire
is =

large. 24 inch in diameter. I figure 2941rpm at 60mph. I think part of t=
he =

problem is moving so much weight at such low rpms. If I could find a mot=
or =

which was designed to take 200 to 300 amps continous that might work. I'd
like =

to keep the brushed motors but I'm open to suggestions. I'm hoping a K or
maybe =

an L91 will work better. Lawrence Rhodes.....


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #3
Can you move the motor to the side and run a chain reduction between the
motor and the driveshaft? I have seen that done before.

Keith

-----Original Message-----
From: Lawrence Rhodes [mailto:[email protected]] =

Sent: Monday, March 07, 2011 5:39 PM
To: [email protected]
Subject: [EVDL] Second opinion on motorcycle with 3.5 to one gear ratio.

I am converting a VT700(Harley Sportster =

clone)Honda from 1987. The shaft drive is set. I smoked an 8 inch
diameter =

Yale forklift motor in just a 1/3rd mile up hill test. Much sizzling and =

crackling with the smoke. I drove another time and kept the voltage to 36
but =

it still heated up even on level ground with mild hills. I need something
that =

will take the big back wheel and 3.5 to one gear ratio. I am running a
Curtis =

120vdc 1221C which is 400 amps max. The problem is heat disipation=
. The
Yale =


just can't do it. Also the bike has 20 Hawker 13EP buddy paired at 220
pounds. =


I'm 240. The bike with motor has to be at least 200 or so. The back t=
ire
is =

large. 24 inch in diameter. I figure 2941rpm at 60mph. I think part of t=
he =

problem is moving so much weight at such low rpms. If I could find a mot=
or =

which was designed to take 200 to 300 amps continous that might work. I'd
like =

to keep the brushed motors but I'm open to suggestions. I'm hoping a K or
maybe =

an L91 will work better. Lawrence Rhodes.....


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #4
Lawrence, =

How many cfpm was your external blower pushing through that motor?
You will not be going 60 up the hill, I am guessing it
will be closer to 30 or lower as many intersections in
SF are 4-way stop, so you have to accelerate uphill from
a full stop....
24 inch dia means more than 2 yards per rotation.
30 MPH is 1/2 mile per minute, so 420 RPM on your rear tire
and the 3.5 ratio makes this 1470 motor RPM.
This means that any internal fan will be ineffective at
such low speeds and you will need a very powerful external
blower pushing a lot of cold air through the motor to give
it forced cooling.
I think a much better way to drive around in a hilly city is
to increase gear ratio to at least 5 because then the current
will drop by about 40% which means that the heat in the motor
will be less than half at equal performance and the internal fan
will be more effective. But you may still need an external
blower to allow you to continuously draw high amps at lower RPM.

The max speed, assuming your motor has a redline of 4500 will
still be around 65 MPH with the 5 gear ratio!

Regards,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behal=
f Of Lawrence Rhodes
Sent: Monday, March 07, 2011 2:39 PM
To: [email protected]
Subject: [EVDL] Second opinion on motorcycle with 3.5 to one gear ratio.

I am converting a VT700(Harley Sportster clone)Honda from 1987. The s=
haft drive is set. I smoked an 8 inch diameter Yale forklift motor in ju=
st a 1/3rd mile up hill test. Much sizzling and crackling with the smoke=
. I drove another time and kept the voltage to 36 but it still heated up=
even on level ground with mild hills. I need something that will take t=
he big back wheel and 3.5 to one gear ratio. I am running a Curtis 120vd=
c 1221C which is 400 amps max. The problem is heat disipation. =
The Yale =


just can't do it. Also the bike has 20 Hawker 13EP buddy paired at 220 p=
ounds. =


I'm 240. The bike with motor has to be at least 200 or so. The back t=
ire is large. 24 inch in diameter. I figure 2941rpm at 60mph. I think pa=
rt of the problem is moving so much weight at such low rpms. If I could =
find a motor which was designed to take 200 to 300 amps continous that migh=
t work. I'd like to keep the brushed motors but I'm open to suggestions.=
I'm hoping a K or maybe an L91 will work better. Lawrence Rhodes.....


_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #5
The nice thing about this bike is the shaft drive. Very quiet. Very s=
mooth. I =

just wonder what it would take to change that ratio? I expect it would t=
ake =

unattainium. It seems I need something like two A89's or one 8" ADC. =
Or up the =

voltage to 240 or more. Waylands creations at low rpms and high voltage =
seem to =

work well. Very efficient too. But there is a lot of motor to suck up=
heat. =

Lawrence Rhodes.......

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #6
Lawrence Rhodes wrote: =


> Waylands creations at low rpms and high voltage seem to work well.

If you're refering to the White Zombie, bear in mind that it doesn't spend =
a lot of time at low RPMs ;^>

I believe the original Siamese 8" motor has *no* internal cooling fan; I ex=
pect the present Siamese 9" motor is similarly configured, but don't know f=
or certain.

Roger.

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #7
Yes while racing Zombie doesn't stay low long but it is driven miles to the =

track at city street and freeway speeds. LR

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 
1 - 7 of 7 Posts
Top