A homopolar generator, also known as a unipolar generator, is a type of electrical generator that produces direct current (DC) electricity. It operates on the principle of electromagnetic induction, but unlike conventional generators that rely on rotating magnetic fields, a homopolar generator uses a constant magnetic field and a rotating conductor.
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For a conducting disc of radius rotating in a uniform axial magnetic field , the shaft-to-rim motional electromotive force is . A current between shaft and rim gives the opposing torque , making electromagnetic conversion power equal to mechanical torque times angular speed.