What two parts do the magnetic fluxes passing through the core section consist of?

(2) The magnetic flux west M generated by the permanent magnet passes through the magnetic flux of the core cross section.It is in the same direction as the west M.Since the area of the core cross section is small, the core is in a saturated state after a large magnetic flux.When the core is saturated, the inductance of the coil L will be lowered.