Are you saying that all the "two-wire" motors I've seen actually have two windings
Two wire Induction motors ( as opposed to motors with brushes and a commutor ) will have at least two out of phase magnetic poles.
These can be either
two separated windings with a capacitor in series with one
or
a single winding and one or more "shaded magnetic pole(s) " which are created by shorted turns of copper around part(s) of the magnetic path.
The shading coils delay the magnetic flux thus creating a pseudo magnetic phase and hence a "rotating" magnetic field.