Black & Decker Rechargeable Battery Motor

Status
Not open for further replies.
J

jetrinkum

New member
Messages
6
Reaction score
0
I was in the process of building an electric assist bike, and ran into a few problems, in hope that some of you would be able to assist. With JerryAssBurger's advice, I bought a lawnmower, pulled the motor, mounted it behind my seat, attached a sprocket on the motor and the bike wheel, have a chain connecting them. I want to run the motor on a 24v circuit, because that's what it's made for. I got 2 battery's with 18ah. I wired them in series to make 24v and am using the charging system from the motor to charge the batteries.

Here is a rough paint drawing of the way the circuit is set up.


There is some kinda restricted component on the board though because like this, it will run for 1 sec than cut out. The only way I can get it to run continuously is to have the circuit exactly the same, but have 2 extra wires run to the switch, so in theory I have to circuits. One for charging the batteries, and one for running them. So this is the way It looks now:


Thoughts? I don't know much about the circuitry. I'm some 20 year old kid and this was just an Idea for a summer project. I don't know if a controller would be worth it or not, judging by how weak the 12v seemed. But What do I know? Here is what the project looks like now. What should I do? Would a controller be a good buy? Alternatives? I have no idea how many amps I'm pulling. Better ways to wire? I have no Idea?

Here it is : :roflol:


 
Kaptain Krunch

Kaptain Krunch

Pro Junk Collector
Messages
4,636
Reaction score
4
Location
vermont
Diode lets voltage travel in one direction but not the other, you want one that allows voltage to flow from the charging system to the battery but not the other way. What exactly are you using for a charging system by the way?
 
J

jetrinkum

New member
Messages
6
Reaction score
0
The charging system is what charged the batteries on the motor. So I can plug the AC transformer to the wall, and there is a fitting on the back (in my little pencil box) that will allow the circuit to recharge the batteries.
 
dpaxson

dpaxson

New member
Messages
346
Reaction score
0
Location
parma heights, oh
this is unrelated to the charging issue, but you have that motor geared way to high. you should find a smaller gear for the motor
 
Kaptain Krunch

Kaptain Krunch

Pro Junk Collector
Messages
4,636
Reaction score
4
Location
vermont
Oh, nevermind if your just charging it with a wall charger like it was meant to do, there is no need for a diode. I thought you had something to charge the batteries while you peddled like an alternator.
 
O

oscaryu1

New member
Messages
2,767
Reaction score
6
700 watts is alot. I'd say run it at 48V, unless 36V gets the motor hot already.

Your gearing is also over done, that's a 1:1 pretty much. You could run 12V and get to 30MPH or so (saying you had 30 minutes to top it out)
 
J

jetrinkum

New member
Messages
6
Reaction score
0
I don't know anything about gearing. I just took what I had laying around my garage and bolted it up. The lawn mower was made to run on 24V, so I assumed thats what it should be run at?
 
Jerryburger

Jerryburger

Admiral Annoy
Messages
1,104
Reaction score
13
Location
The Nation's Catbox...er, AZ.
COOL PROJECT! Those motors have got some stink to them, so you should have fun. Question: when it runs for just a second or so, does that mean under load, or freewheel? I'm asking, because it looks like you're running a 1:1 ratio (1 turn of the motor to 1 turn of the wheel)... which is too much "gear" for the motor. (If it were still mounted on the mower, it would be the equivalent of hitting some REALLY THICK GRASS and bog the motor down to where the current protection kicks in. Try a smaller gear on the motor and/or a larger gear on the rear wheel... these motors spin about 2000 rpm on the mower- anything less will be interpreted as bogging down. If you get your ratio to around 8 turns of the motor to 1 turn of the wheel, you'd be doing well.
 
Status
Not open for further replies.
Top