In a 2 pole BLDC motor i can see the net direction of the field flux (coming from north pole and going towards south pole). But in 4 pole BLDC motor what will be the direction of the net field flux? I can only see the 4 pole rotate simultaneously (when motor spins) but what will be the direction of net field flux created by adding the magnetic field of the 4 pole together?
I am asking this question because in FOC we need to know the direction of the field flux. Most people uses encoders but encoders give the position of the rotor with respect to the fixed stator axis. How they uses encoders to know the field flux position with respect to the fixed stator axis??