I have been trying to find a way to accurately know what voltages will be seen by the high side fets with different motors. So I would set the resistance and inductance of the motor and can see the peak voltages.
Using the simulation that Benjamin made in LTSpice shows very small voltage peaks which I don't really believe.
If I just model one phase path with 2 IRF7769 mosfets, then it looks much more realistic. Plus you can model the motor phase much better.
So if I run a simulation 16S with 9.6uH 13mOhm motor I get spikes up to 72v with about 80A motor current.