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The unit that gives the lowest resistance will give the most power. I choose the Green Ametek as typical and plotted electrical data on it.

The above chart shows that as voltage increases the RPM increases. This chart compares running as a motor and running as a generator or running in reverse direction as motor and generator. The brushes are slightly offset for optimum power in one direction. As current generation increases the voltage goes down causing a new curve to be drawn.

Offered by Mike.