first try

[wetdog]

this is my first try at a electric anything that moves
i found this site after i took a few test rides, so my mistakes are my own
come to think of it all rides so far have been test rides
it's on 24v now and no speed control, switched with a starter selinoid from a
yamaha i think, seems to work
e-bay motors for like 27 bucks each
does anyone know anything about them? all i got is 350 watts 24v
2 yuasa 12v 17.2 a/hr batteries, charged with a bench power supply
comments and suggestions welcomed, i can take it
the main thing is it's been fun

 

[vanilla ice]

Nice nice. I have two or three dual motor ideas kicking around in my head and one of em is sommin like that with the jack shaft behind the seat. How'd you get that big sprocket fixed to the cluster? How does it go?

 

[wetdog]

the new sprocket i.d. was bored to the o.d. of the second sprocket on the cluster, washers were used to space it so it didn't slip between the cluster sprockets
then the new sprocket was drilled and tapped for 4, 10/32 screws that clamp it to the largest cluster sprocket
the white thing on the cluster is a freewheel thing
the smallest sprocket had the teeth ground off and that white nylon thing fit over the nubbs now the motor can run without the pedals moving

hows it go ? i don't know, i don't have any reference, but a 1000cc bmw
but everyone who rides it comes back with a grin from ear to ear, i guess thats good

 

[magudaman]

Look very nice for your first try. I like you dual motor mount and the idea for mounting the sprocket. I might have to do something similar to that. The only other way I really considered doing rear sprocket was with a disk hub and using the disk side to bolt to but I really like your idea. I had those motors on old scooter and they were really pretty weak but two is helpful. Nice job!

 

[fechter]

Nice machine work. Welcome to the forum.

The newer versions of those motors (the ones with cooling fins) are much stronger. You could probably add another battery and make it go faster. Depending on the gearing and hills, those motors should handle 36v.

You could get a speed controller for variable speed from TNC Scooters (cheap).

With two motors, you could switch them between series and parallel to have a high and low range.

It would be nice to have a second freewheel between the drive sprocket and the hub so you don't drive the pedals with the motor and vice versa.
I'm not sure exactly how you would do that easily. I seem to recall a freewheel that was threaded on both ends so you could stack them.

Any idea what the top speed is?

I see you've discovered the "EV Grin"

 

[TylerDurden]

'Tis a thing of beauty.


But the grin can be addictive. Be warned... this path can lead to madness:

"Insane-a-cycle"

"ER1"

"Killacycle"



:wink:

 

[Drunkskunk]

Thats a nice setup. Welcome to the forum.
I like that nylon idler gear. thats pretty clever.

 

[wetdog]

thanks for the kind replys
as for speed , it's geared now for a theoretical top end of a blazing 15 mph
and i'am thinking of a smaller counter shaft sprocket to get 13.5 mph
reason being in western PA you share the roads with cars, if they decide to share
going of the berm of our roads reduces your chances of living to about 50/50
and you don't go anywhere without going up a hill, brakes are more important than top speed
there are some rails to trails paths around but they say "no motorized vehicles" so i might do those for a while, but not at any kind of speed
car cruises and pit bike duty are more it's intended uses, dodging moms and little kids is important
a speed control would be nice but this thing pops a 30A fuse like a flash bulb
it would be nice, to get one of those 36 or 48 volt controllers for the amperage and tweak the cut-off voltage down for a 24v system....possible?

 

[Drunkskunk]

Should be easy to modify a controller for a lower cutoff voltage. Most can be changed by swapping out a single resistor.

The advantage with a controller is it will limit the currant to the motors, so it won't pop the fuses anymore. if the controller has a 30 amp limit, it will let 30 amps through with no problem, but nothing more. The thing with motors is, when you first start them turning, they will suck down as many amps as they can for the first second or so, untill they get spinning. Having 2 motors, you might go for a 40 amp controller. That way each motor can get 20 amps when it needs it

 

[recumbent]

Welcome to the forum.
I like that nylon idler gear. thats pretty clever.

8) I second the idler idea, clever indeed 8)