The maximum power density ratio for a motor i have seen till now was of YASA -400 i,e 8.25 Kw / kg but the motor is rated for 700V .
What is the voltage rating you're going for?
If your voltage rating is lesser then you can go for YASA -750 which is rated for @ 380V giving a peak power of 100Kw and weighing 25 kg
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