Physics--A.C GENERATOR?

Question

how the faradays homopolar generator function for production of continuous induce current??

Answer 1

First of all, the homopolar generator does not generate AC.  It only generates DC.

As the disk rotates in a static magnetic field, electrons in the conduction band of the disk near the center of the magnetic field are forced from their atoms by the Lorentz force at a certain (small) rate.  Electrons in the conduction band of the disk near the outer portion of the disk see a much larger Lorentz force causing them to move.  There is a differential in the motion of the electrons from the inner portion to the outer portion of the disk.  You actually have a d^2i/dt^2 factor.  Current is produced because of this differential.  That's my understanding of it, anyway.

Connecting brushes and wires from the inner portion of the disk (axle) and the outer portion of the disk (the outer radius) to a load will allow the differential current to flow.

Some large experimental models of these generators have produced direct currents of several Mega-Amperes.  The voltages are usually quite low.

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