bemf

I am working on a motor project and I have very large inductors that will possibly need flyback diodes, but my inductors also change polarity. So a regular diode would just create a short in the other direction wouldn't it? So how do I deal with that? Do I have two flyback circuits(one going...

This part of the schematic from the STSPIN32F0251 EVB allows the user to select between various commutation inputs to operate a BLDC motor in sensored and sensor-less modes. Can anyone help me understand the BEMF measurement part? Also, how is that all the inverting input of the opamps come from...