Posted by Jim Becker on November 28, 2012 at 19:15:57 from (173.74.120.222):
In Reply to: Generqtor differences posted by charlie M on November 28, 2012 at 05:42:32:
Here is another little bit on the third brush. The main and ground brushes are 180 degrees apart. The voltage across them is the maximum available for a given field strength and armature speed. The third brush, being in an offset position, is sensitive to distortion of the magnetic field. The faster the armature spins, the more the field distorts. Thus the voltage from the third brush is reduced, if not absolutely less it is at least less relative to the full voltage at the main brush. The net effect, 3 brush generators tend to be self limiting. As they are spun faster, the output voltage approaches a limit rather than running up out of control. A full regulator does the limiting so that type generator doesn't need to limit itself.
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