When I was in Calgary doing my intern at Solarbotics, I when to this store called Power in Motion that specialize in urban electric transportation. They had this neat demo wheel of the inside of a hub motor.
Here are the hall effect sensor. There is 3 sensors.
Here you can see the slot inside the shaft where the wires can travel.
There was also this neat battery. 48V 10.5Ah lithium battery. It weight 3.4Kg (7.5Lbs)
That could fit in my scooter. The only draw back of those specific battery is the continuous current discharge. It is very low. I think it is 2C so 20Ah… the motor consume about 4Ah with no load and I get surge current of 70Ah.
Here is the work on the new revision of the original scooter. The original scooter is very small in length (29 inch). To select the new size of the new scooter, it was really easy. I just place my feet on the ground at a distance that I felt good and stable. Like on a snowboard. So I added around 11 inch for a total of 40 inch (wheel to wheel).
Here is how I did.
This is the frame I found at St-Eustache flea market, one of the biggest in Québec. I paid 10$ for it. Just the frame no motor, no battery. They are in very good condition and normally, when found online, they cost 18$ for the front wheel and 20$ for the back one. So 10$ was a good deal.
I have to go again to that flea market this summer! I will bring my dad, he loves flee market just like me!
Saw the entire frame in 2.
I also made 2 of those plate you see in the picture so I can give tension on the belt with the left end screw. When I turn the bolt, the washer (big circle) is move to the left, it pulls the axle of the back wheel.
To have a longer frame, I will use aluminium L bracket. To mount them to my scooter, I drilled hole in the frame.
Here I cut the L bracket.
I also added other metal bracket to hold all the electronics in the middle of the frame.
Here is the progress. It feels stables when I get on it.
The new 11 inch makes a huge difference!
If you remember this post about the new motor I got? After installation I had some minor problem with it.
After I installed the motor, I saw this. Look closely, the outher shell (black) is touching the gold piece. There is suppose to be a gap between them.
I machined this like spacer.
Without the spacer.
With the spacer. See the difference?
When I went for my AH1N1 vaccination back in 2009 I saw this bike in the middle of the mall. This man was offering his service to modify normal bike in crazy looking sounding moped.
I wonder the time it takes to get that sprocket spinning perfectly straight.