The simplest system is FEMM. Three screens. Maximum EMF when the magnetic rotor closes the flux into the core, while the magnetic induction in the area of the conductor (highlighted with a circle) is zero. If the rotor (magnet N42) has a transverse position, the main induction is around the magnet, and in the area of the conductor the magnetic induction is 0.09T (effectively zero). There is another position, when the rotor and stator are short-circuited, the magnetic induction in the conductor zone is 0.04T.
This is all you need to know about the principle of operation of the simplest generator with a core.
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