Carl --
I think I liked your first explanation better (that the additional
windings increased the strength of the field and the motor's speed).
Since the 1-speed motor has it's hot lead always on and the switch
controls a ground it would not surprise me if on a 2-speed motor both
windings were always connected to a hot lead and the switch controlled
whether one or both were grounded.
Interesting & mysterious.
Geo
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