iv pulled apart my e-go to have a closer look, the cable they use is this one
http://www.greenbikekit.com/9pin-waterproof-connector-cable.html they just cut the white temp sensor cable.
The motor has hall sensors at 30 some thing degrees, glued to the top of the stators (not places inside the stator slots)
Like this. But on a small pcb!
The gearing is 13t/35t similar to what we all use,
The battery pack is panasonic 4.2v li-ion batterys, to make a 29.4v 7.8ah battery pack
The Bms is interesting, it doesn't have any mosfet on it but there is a small cable coming from the battery pack I think it's 5v to activate the mosfet located on the speed controler. This brings me to the speed controler, it has 12 mosfets instead of 6, 6 for the speed controler and 6 for the Bms. It's cool that they have integrated it, I think for maybe amp limiting,
The motor only draws between 10-15amp peak but the mosfet they use are f3205zs, so we could maybe upgrade the batterys to sony vtc4 cells and get 60-90amp output and the motor could handle it and the speed controler and Bms could if they havnt incorporated any amp limiting! But realy I don't think they need to because the batterys just can handle more then 25amp peak out put.
So the ESC uses a Esc mega32E5 do I think it could be flashed and copied! But I don't think it's needed as the the only benifit of this ESC is it has bluetooth built in!
Because of the gearing and the wheel size and the voltage, the motor is wound in wye at about 110-130kv this is confirmed by the look of the winding, it's not a noarmal delta dlark winding.
If this is correct the cross section of the copper in the motor should be the same, the 250kv 50mm motor has recommended amp of 50-80amp, change the delta to Wye and the recommended amp would be about 30-50amp
So by my understanding the motor can actually handle over 1000w but because of the low kv the top speed in only 20km
So my upgrade recomendation is to swap the batterys from the current to sony vtc4 or vtc5 cells 7s3p, this will pop the amps up enough to get up some heaps better hills! Cost from China $120
And upgrade the motor $40-50 270kv 8mm shaft so the ntm 5055 motor will do, put the hall pcb into this motor making sure you aline the halls correctly, or better u buy a motor from bruno at alien power systems with the 8mm shaft and hall sensors, but the $9 9pin motor connector and send it to bruno and pay him to solder these wires to the hall sensors in the correct combination.
Pop the new motor in and you have a board that has more power and speed over 40km/h
This can't be confirmed with out trying!
The only reason the made a 500w board instead of a 1000w in because they want to sell to every country with power limitations.
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Thanks for reading! This could all be wrong, but I don't feel there are any limiting in the ESC!