GordonFreeman
1 mW
- Joined
- Dec 13, 2017
- Messages
- 17
Hello, I want to try to take my old 2005 CRF450R and build a wheel motor for it. I've only ever rewound hobby RC type motors and I have a thread on RCGroups motor design forum. But you guys are obviously more experienced with dirt bike scale builds.
A bit of info on the stator. It's about 10" diameter, 1" thick, 36 tooth, 7 lbs.
Custom rotor with 16 pole pairs in a halbach array is planned.
Stator rewind is looking to be AaABbBCcCAaABbBCcCAaABbBCcCAaABbBCcC. I was contemplating a mid motor, but once I started looking at it and looked through some threads here, I think I want to do a direct wheel motor. On RCGroups some helpful folks estimated that for a desired 6.6 kv I would need to do about 10 turns per tooth. But at that time, I was planning chain drive (3:1 or so) and a max speed of about 30mph. But that will change now.
One thing that concerns me is what kind of rear swing arm "jacking" could happen with a wheel motor. There are probably geometries and linkages that could minimize that effect.
Another thing that concerns be is startup studder/cogging problems. I would think at the very least I should plan for a sensored ESC. I do have a VESC laying around somewhere that I could experiment with. It's only 80v 50 amp as I recall. But you guys also seem to be using some really advanced ESCs compared to the hobby world, so I'm hoping for some good advise there too.
The original bike is ridiculously powerful at 40kw, I was thinking 20kw would be a good goal to shoot for. Maybe 100 to 200 volts.
I have to admit, the new Koenigsegg motor got me thinking about doing a conversion.
https://www.roadandtrack.com/news/a38940998/koenigsegg-quark-electric-motor/
I'm even considering liquid cooling the stator. Inwheel motor, I get it, complicated. Big hollow axle needed.
I like the idea of getting a spoked rim more appropriate for onroad (and smaller diameter I would think) and would like to incorporate spoke holes in the rotor. They would obviously be short spokes.
Input desired!
Some pics. The pic with the partial wind was just a test to see how much wire I could fit.
A bit of info on the stator. It's about 10" diameter, 1" thick, 36 tooth, 7 lbs.
Custom rotor with 16 pole pairs in a halbach array is planned.
Stator rewind is looking to be AaABbBCcCAaABbBCcCAaABbBCcCAaABbBCcC. I was contemplating a mid motor, but once I started looking at it and looked through some threads here, I think I want to do a direct wheel motor. On RCGroups some helpful folks estimated that for a desired 6.6 kv I would need to do about 10 turns per tooth. But at that time, I was planning chain drive (3:1 or so) and a max speed of about 30mph. But that will change now.
One thing that concerns me is what kind of rear swing arm "jacking" could happen with a wheel motor. There are probably geometries and linkages that could minimize that effect.
Another thing that concerns be is startup studder/cogging problems. I would think at the very least I should plan for a sensored ESC. I do have a VESC laying around somewhere that I could experiment with. It's only 80v 50 amp as I recall. But you guys also seem to be using some really advanced ESCs compared to the hobby world, so I'm hoping for some good advise there too.
The original bike is ridiculously powerful at 40kw, I was thinking 20kw would be a good goal to shoot for. Maybe 100 to 200 volts.
I have to admit, the new Koenigsegg motor got me thinking about doing a conversion.
https://www.roadandtrack.com/news/a38940998/koenigsegg-quark-electric-motor/
I'm even considering liquid cooling the stator. Inwheel motor, I get it, complicated. Big hollow axle needed.
I like the idea of getting a spoked rim more appropriate for onroad (and smaller diameter I would think) and would like to incorporate spoke holes in the rotor. They would obviously be short spokes.
Input desired!
Some pics. The pic with the partial wind was just a test to see how much wire I could fit.