I want to convert my existing cargo bike into an electric bike.
Ok, this project assumes
a) that odrive can work sensorless (without encoder) => i think it’s been implemented last summer (https://www.youtube.com/watch?v=-T2dhQKIgUA)
b) that I manage to mount v-brake to change the braking system (http://www.identitibikes.com/FKITRBA/Rebate-V-adaptors) => i will do it anyway
This is my wonderfull Babboe City => http://babboecargobike.com/product/babboe-city-cargo-bike/
I use it to bring my kids to school in the morning, then go to work. and directly go back home once the day is over. That takes me about 50-55min in the morning and 35-40 min in the evening.
I was using a pulling cart with my regular bike before but my kids grew older and wouldn’t fit in anymore. I bought the non-electric version (~1500eur) a few years ago because i wanted to make some daily physical exercise too. However, the electric version of this Babboe bike is not just an update of the classic version, there is a different gear drive system, and the frame accommodates for a battery and different brakes too. it’s about 2500-3000 EUR.
I could sell my own and buy the e-bike version. But it would be little fun and i doubt i would find a buyer anyway.
I think it’s a great opportunity to use odrive for an outdoor project. Toying around the rear wheel is a no-go. Way too complex, I even struggled to change a flat tire. The less intrusive way to do it, is to swap the front wheel for an e-bike wheel. A bit like a the Evowheel (https://www.indiegogo.com/projects/evowheel-the-ultimate-e-bike-revolution-bike-electric#/), they even have a 20 inches version that would be a perfect match for my wheel (for 800 USD). But again, it’s no fun.
I was thinking of using
- odrive in speed mode and gimbal motor mode with a single motor
- an arduino for sending commands through uart interface + reading some potentiometer (manual throttling on the bike handle for speed) and probably a bluetooth interface to change the settings on the go from a simple smartphone app i would develop. I assume arduino could be powered from a VCC 5V pin somewhere on odrive (from the encoder pins maybe?).
- i then need to find a suitable motor (must fit in the 105mm available space. Could be this one => https://www.ebay.com/itm/Bafang-8Fun-36V-48V-350W-Geared-Hub-Motor-for-Ebike-Front-or-Rear-Wheel/162820743214?hash=item25e8df602e:m:m45JK9iNILdF389X1NwUWgA ) + a 20" wheel and make the spokes to connect with motor + find a suitable battery.
- find suitable water/dust proof connector & enclosure
What do you think? What kind of nasty surprise have i missed?