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By Jerome, July 23, 2010 6:00 am

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.

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By Jerome, November 20, 2009 8:00 am

I was surfing the web and found this awesome build by some guys at MIT. They made this scooter during a summer engineering workshop.

http://web.mit.edu/first/scooter/

They design and made there own 590W hub motor. Not only one motor but 2 motors! 2 wheels drive scooter!

Me and my friend Jérôme ( yes, one of my good friend is also name Jérôme and we always work together so it is Jérôme² ) are thinking/planning of making our own hub motor for a scooter.  On the BWD scooter website, there is some pretty good info and mathz equations to make your own. Worth looking into.

This is pretty darn sick! Those motors are really powerfull.