eTrike said:I'm curious if anyone has tested saturation limits? I remember seeing LFP's dyno testing of 28 or 35mm 9C(?) and getting no more HP above ~4.75kW iirc? Someone else recently mentioned not feeling much difference between 14-18kW on a QS205 iirc...
One thing first:
forget to talk about battery power and battery amps because those values do not include the losses.
basically those motors are limited by torque which means the only thing you should really care about is the phase amps and winding resistance.
than you know the exact amount of power that will be turned into heat.
according to Justins tests he did with one 205 / 28H motor, the saturation starts at around 12,5Nm per 5mm stator width.
The stator design (tooth count) and pole count only play a very small role, so for the most part it is about diameter and width of the stator.
Magnet strength i believe also needs to be considered, but there isn't much differnce between most hub motors (N35 - N38 grade neodymium is mostly used).
Now, roughly it means a 45h motor like mxus will saturate at a torque output of around 110-120Nm, and 50h like QS at 120-130Nm. The newer versions with the stronger and curved magents should make some percent more torque before saturation starts to crop up.
The more torque you require, the more you will like the QSV3.
It is not only more efficienct in producing torque, it also has more copper fill so it will produce additionally less heat at given torque output.
Personally i think the sweet spot of power/handling(regarding mass) is the MXUS V3 in 17" moped wheel.