Hi, I've never built a EV but I have experience with electronics/robotics etc. Been researching for a few months and I have a few questions. looking to build ~3kw e-bicycle.
1. why would one use hub motors for bicycles/motorcycles? They seem 10 times heavier with same performance of 'normal' brushless outrunners. Is it only due to simplicity of them not requiring gearing/chains etc? I'm suspecting the weight comes with the amount of wire required to create such a low KV motor?
2. I see orders of magnitude price differences between motors of seemingly similar performances, like,
https://alienpowersystem.com/shop/brushless-motors/aps-6384s-sensored-outrunner-brushless-motor-130kv-4000w/
and
http://www.astroflight.com/3220
how come? (maybe the alien power rating isn't continuous but peak? still, they do have way cheaper higher rated motors as well..)
3. speed controllers. I often see really big speed controllers for e-bikes, while e-skate controllers seem super light with same performances.. how come?
would something like focbox be ok for an e-bike? http://www.enertionboards.com/FOCBOX-speed-controller.html
thank you!
1. why would one use hub motors for bicycles/motorcycles? They seem 10 times heavier with same performance of 'normal' brushless outrunners. Is it only due to simplicity of them not requiring gearing/chains etc? I'm suspecting the weight comes with the amount of wire required to create such a low KV motor?
2. I see orders of magnitude price differences between motors of seemingly similar performances, like,
https://alienpowersystem.com/shop/brushless-motors/aps-6384s-sensored-outrunner-brushless-motor-130kv-4000w/
and
http://www.astroflight.com/3220
how come? (maybe the alien power rating isn't continuous but peak? still, they do have way cheaper higher rated motors as well..)
3. speed controllers. I often see really big speed controllers for e-bikes, while e-skate controllers seem super light with same performances.. how come?
would something like focbox be ok for an e-bike? http://www.enertionboards.com/FOCBOX-speed-controller.html
thank you!