Correct arrangement of current sensing resistors for a BLDC motor?

Question

I am designing the current limiting (fault detection) circuit for a three phase BLDC motor and I wanted to ask, If I have three switches on at any given time (180 degree commutation) than should the sensing resistors be placed as shown in figure 1, or is it fine to have it as shown in figure 2 which is typically used for 120 degree commutation method. Thank you.

Answer 1

If you need only to check the current limit, then this is the way:

^{simulate this circuit – Schematic created using CircuitLab}