Green Bike Kit http://www.greenbikekit.com/index.php/e ... w-36v.html
E Life Bike http://www.elifebike.com/peng/pic.asp?M ... ID=S220062
EV-Assemble http://www.evassemble.com/index.php?mai ... ktb9j7dle7
Bafang 500W-BPM also available from ES member Keywin / email@example.com
Crossbreak and Miles have calculated that the Bafangs "might" run well up to 2,000-RPMs at the motor (5:1 reduction to the output shell, so 2,000 motor-RPMs = 400 wheel-RPMs), and any RPMs above that: efficiencies and waste-heat both slowly curve to the bad side...
https://endless-sphere.com/forums/viewto ... 00#p608467
Here is a breakdown of the BPM-II, showing the minor differences.
https://endless-sphere.com/forums/viewto ... 00#p768925
A short video of "fullthrottle" opening up his BPM to clean, re-grease, and replace the freewheel...
https://endless-sphere.com/forums/viewto ... 25#p590956
Jeremy Harris' and Wurlys' acquired data on Bafang code#/turn-countsFirstly, the two BPM models [from BMS-Battery] and the new CST cassette-hub model are all rated at 36V. The coding applies to a 36V input and all the values I will be giving you are in unloaded conditions. Let's begin with a code-16 motor and work our way to the code-8 motor.
_8_______378. mind you, all of these specifications are directly from the engineers of Bafang.
https://endless-sphere.com/forums/viewto ... =2&t=43106
https://endless-sphere.com/forums/viewto ... 23#p515152
This drawing is reported to be a BPM
https://endless-sphere.com/forums/viewto ... 15#p207898
Specs per ES member full-throttle: https://endless-sphere.com/forums/viewto ... 50#p703912
The motor pictured below was purchased from Green Bike Kit in April of 2013, and may vary slightly from older Bafang-BPM versions. Here is a link with pics of a BPM from 2012 which show some of the internal differences: https://endless-sphere.com/forums/viewto ... 04#p513278BPM 500W Code-9
Phase impedance 70mOhm
Phase inductance 275uH
9 turns x 10 strands of d0.56mm (23-AWG)
34 lams 0.50mm
18 teeth: 17mm wide x 10mm deep x 14mm high
Stator diameter 130mm
Air gap 0.50mm
Magnets 8 pairs 18mm wide/deep x 26mm long (along the rim) 2.5mm thick
Flux ring 6mm thick
Wooden stand central hole is 80mm diameter, the cord slot is 18mm wide
The distance between square sides when the stand is flipped over is 5-1/4 inch / 133mm