F
The definition of magnetic flux physics is the number of magnetic field lines perpendicular to a certain area. Our simple understanding is the physical quantity measuring the overall magnetic size, the unit is Wb, expressed by Φ, Φ=B×S, B stands for magnetic induction intensity, S stands for magnetic pole area, that is to say, the size of magnetic flux depends on the magnetic pole area and magnetic induction intensity.
When the magnet is in the open state, the actual remanence value Bdi (also called intrinsic flux density) corresponding to the working point can be calculated by using the method of magnetic flux conversion. Bdi=Φ* coil permanence/magnet volume.