Last year, a guy traded me a bike with brush front hub motor, not working, of course.
Posted up a picture and got a probable ID as a Wilderness Energy BD-36s - circa 2005.
36V 600W rated.
Tested motor with 8V and turned and sounded smooth so ... Winter project!
1. Broken and rusted spokes.
Re-laced with 13ga 188mm SS spokes (192mm more ideal)
After figuring out the 5 position switch ... I finally gave up on the controller and installed a 24-44V capable 28A controller.
24V YiYun YK31c that works fine at higher voltage, but with 50V caps, so 44.4V limit.
Cut motor wires near old controller and add XT60 connectors, from controller and to motor.
Added XT60's to Battery also.
Why the 24V controller?
Well, when testing motor with 8V, I did a count at 80rpm, that adds up to a no-load 32mph @ 36V.
Wanted "legal" ... option, ~ 20mph @ 25.9V.
This motor presents a particular quirk, hub motor is wider than typical.
Requires 3.5"+ fork width till several inches up fork.
Solid forks typically have pitiful brakes.
Only found acceptable option is a disc and rim brake hybrid fork (motor has no disc option).
Bike it came with had fork tubes crushed to provide clearance!
Found a nice Schwinn bike that fills requirements ... but testing 1st, so on original bike, for present.
Just got a spare dozen 36V 4.4Ah Samsung hoverboard packs, so paralleled a few for testing purposes.
Since this was just a testbed I did not "properly" mount battery or controller.
Somewhere(?) I picked up a Nintendo Gamecube bag that works nicely.
4 batts, 36V 17.6Ah fit nicely!
Tested bike 1st with a single 36V 4.4Ah but kept below 25A draw, Samsung ICR18650-22p rate at 10A continuous 20A surge, so 20-40A capable. Possibly limited by 30A pack BMS?
Added speedometer and V-A-W-Ah meter
No-load speed estimate proved accurate @ 32mph.
Motor only, cruises at 23+, pedal assist helps greatly, but bike not set for proper pedaling, so no definitive tests.
Quieter than my chain drives ... too quiet, can't adjust speed by drive-train pitch.
Controller draws 32A full throttle-from dead stop till ~8mph, which seems to make it an acceptable controller. Larger controller would only help getting started, slower than 9mph, where I pedal anyhow.
Overall, motor seems wound a bit too fast. Would be great as assist for higher speeds!
Ideal, laced into a 20"?