| When considering the cogging problem, I became aware of a class of alternators. A simple example is shown below. The magnets move cc as indicated inducing the three voltage waveforms in the copper wires as seen below the figure. The sum of the three voltages (connect them together) is a single phase waveform having six cycles per revolution. The wedges to the centers of the copper wires sweep out 30 degrees. I made the magnets circular for clarity. Wedge shaped ones would give greater output. Finally the "copper wires" made be replaced by coils.
In general this type of alternator would consist in the basic configuration of an odd number of coils and an even number of magnets. The wedge angles are equal to 360/(# coils x # magnets). The number of cycles per revolution is equal to
# coils x # magnets/2. For instance 5 coils and 6 magnets give 12 degrees and 15 cycles. At 200 rpm this becomes 50 herz, which could be fed into a step up transformer. 9 coils and 8 magnets give 5 degrees and 36 cycles (60 herz at 100 rpm).
Of course, this is not the end. The number of coils in our example below can be doubled for still more output (confused yet). The new coils are in the same relationship to the magnets as the originals so the frequency does'nt change.
Nor does the wedge angle. You can't double the number of magnets, however, without changing the wedge angle.
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